Unigine::Property Class

Header:

#include <UnigineProperties.h>

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List of functions:

This class provides an interface for property manipulation: it is used to modify properties that allow you to control values of the logic-related parameters. When a property is assigned to a node, an instanced internal property is created and saved into a .world or .node file. However, rather than the whole list of parameters it contains only the modified ones.

The concepts of a path and a name of the property should be distinguished:

The path specifies where the property is stored on the disk. The path includes a property file name.
The name specifies how the property will be displayed in the UnigineEditor (the Property Hierarchy window, the nodes surface section of the Parameters window). The name can also be used to refer to a property from the code.

By default, the property name and the *.prop file name coincide.

By using functions of this class, you can, for example, implement a properties editor.

Properties specify the way the object will behave and interact with other objects and the scene environment.

A property is a "material" for application logic represented by a set of logic-related parameters. Properties can be used to build components to extend the functionality of nodes.

All properties in the project are organized into a hierarchy. To be modified, properties should be obtained from the hierarchy via API functions.

For example, if we have the following *.prop files in the data folder:

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" manual="1" name="surface_base_0" parent_name="surface_base">
	<parameter name="friction">1.833</parameter>
	<parameter name="restitution">0.194</parameter>
	<parameter name="occlusion">0.791</parameter>
	<parameter name="my_parameter">190</parameter>
</property>

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" manual="1" name="surface_base_1" parent_name="surface_base">
	<parameter name="my_parameter">191</parameter>
</property>

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" manual="1" name="surface_base_2" parent_name="surface_base">
	<parameter name="my_parameter">192</parameter>
</property>

You can implement a function that changes a parameter of a given property stored in this library:

Source code (C++)

// 1. Declare a vector to store instances of the Property class
Vector<PropertyPtr> my_properties;

// 2. Implement the function that sets the given value of the parameter named "my_parameter" for the given property
void set_my_parameter(int num, int value){
	PropertyPtr property = my_properties[num];
	int index = property->findParameter("my_parameter");
	if (index != -1)
	{
		property->setParameterInt(index,value);
	}
} 

// 3. On the application initialization, form the array of properties.
// It can be used for fast access to the required properties later
int AppWorldLogic::init() {
	// get a pointer to the property manager
	Properties *properties = Properties::get();

	for (int num = 0; num < properties->getNumProperties(); num++) {
		// get a property from the hierarchy and append it to the list of properties
		my_properties.append(properties->getProperty(num));
	}
	
	return 1;
}

// 4. Call the implemented function when it is necessary
int AppWorldLogic::update() {

	...
	set_my_parameter(num,num+100);
	...
	
	return 1;

}

Notice

You can modify only existing parameters of the property. To add or remove new parameters, you should manually edit the .prop file or use API to edit the XML file via the code.

Adding and Removing Properties

NoticeThe Property class doesn't allow adding a new property to the property hierarchy.

A new property can be added to the hierarchy in one of the following ways:

By creating and editing the corresponding .prop file manually. For example, in the data folder let us create the following file describing a property for a GameObjectUnit:

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" manual="1" editable="0" name="GameObjectsUnit">
	<parameter name="weapon_type" type="switch" items="air,land,all_types">0</parameter>
	<parameter name="attack" type="toggle">1</parameter>
	<parameter name="damage" type="int" max="1000">1</parameter>
	<parameter name="velocity" type="float" max="100">30</parameter>
	<parameter name="material" type="string"/>
</property>

By inheriting from the existing property via Properties::inheritProperty() function or inherit() function of the Property class. For example:
Source code (C++)
```
// get a pointer to the property manager
Properties *properties = Properties::get();

// inherit a GameObjectsUnit_0 property from the GameObjectsUnit property
PropertyPtr inherited_prop = properties->findManualProperty("GameObjectsUnit")->inherit("GameObjectsUnit_0", "game_object_unit_0.prop");

// inherit a GameObjectsUnit_1 property from the GameObjectsUnit_0 property via the Manager
properties->inheritProperty(inherited_prop->getGUID(), "GameObjectsUnit_1", "game_object_unit_1.prop");
```
To save all properties in the hierarchy that can be saved (i.e., editable, having a path specified, and not internal or manual ones) via the Properties::saveProperties() function.
Notice
By default, all parameters and states of the inherited property are the same as specified in the parent property. A child property can override some parameters of its parent or add new ones.
By editing the corresponding .prop file via API: you can open an XML file, write data into it and save it.

To delete a property, you can simply call the removeProperty() function:

Source code (C++)

// remove the property with the given name with all its children and delete the *.prop file
properties->removeProperty(properties->findProperty("GameObjectsUnit_0")->getGUID(), 1, 1);

Adding Callbacks

You can add callbacks to track any changes made to the property and its parameters and perform certain actions. The signature of the callback function can be one of the following:

Source code (C++)

// for the CALLBACK_PARAMETER_CHANGED type
void callback_function_name(PropertyPtr property, int parameter_num);

// for all other types
void callback_function_name(PropertyPtr property);

The example below shows how to add a callback to track changes of property parameters and report the name of the property and the changed parameter.

Source code (C++)

void parameter_changed(PropertyPtr property, int num)
{
	Log::message("Parameter \"%s\" of the property \"%s\" has changed its value.\n", property->getParameterName(num), property->getName());
    // ...
}

// somewhere in the code

// inheriting a new property named "my_prop" from the base property "surface_base" via the Property Manager
PropertyPtr property = Properties::get()->findManualProperty("surface_base")->inherit("my_prop");

// setting our callback function on parameter change
property->addCallback(Property::CALLBACK_PARAMETER_CHANGED, MakeCallback(parameter_changed));

// changing the value of the "collision" parameter
property->setParameterInt(property->findParameter("collision"), 0);

Property Class

Members

Property()

Constructor. Creates a new property instance.

Ptr<Property> getChild(int num)

Returns the child property of the current property.

Arguments

int num - The number of the target child property.

Return value

Child property.

int getID()

Returns the ID of the property.

Return value

Property ID.

UGUID getGUID()

Returns the GUID of the property.

Return value

GUID of the property.

int isBase()

Returns a value indicating if the property is a base property.

Return value

1 if the property is a base property; otherwise, 0.

void setEditable(int editable)

Sets a value indicating if the property can be edited.

Arguments

int editable - 1 to make the property editable; 0 to make it read-only.

int isEditable()

Returns a value indicating if the property can be edited.

Return value

1 if the property is editable; otherwise, 0.

int isHidden()

Returns a value indicating if the property is hidden.

Return value

1 if the property is hidden; otherwise, 0.

int isEngine()

Returns a value indicating if the property is engine-related (i.e. required for engine operation). Such properties are stored in the core, editor and editor2 folders.

Return value

1 if the property is engine-related; otherwise, 0.

int isInternal()

Returns a value indicating if the property is internal.

Return value

1 if the property is internal; otherwise, 0.

int isManual()

Returns a value indicating if the property is manual.

Return value

1 if the property is manual; otherwise, 0.

int isHierarchyValid()

Returns a value indicating if there are no missing parents in the hierarchy of the property.

Return value

1 if there are no missing parents in the hierarchy of the property; otherwise, 0.

int isParameterInherited(int num)

Returns a value indicating if the given parameter is inherited from a parent.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the given parameter is inherited from a parent; otherwise, 0.

int isParameterHidden(int num)

Returns a value indicating if the given parameter is hidden.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the given parameter is hidden; otherwise, 0.

int isParameterOverridden(int num)

Returns a value indicating if a given parameter is overridden.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the given parameter is overridden; otherwise, 0.

void setName(const char * name)

Sets a new name for the property.

Notice

This method is not available for manual and non-editable properties.

Arguments

const char * name - Name of the property.

const char * getName()

Returns the property name.

Return value

Name of the property.

Notice

If the property is internal and has a parent, the parent's name will be returned.

int getNumChildren()

Returns the number of children of the current property.

Return value

Number of child properties.

int getNumParameters()

Returns the number of property's parameters.

Return value

Number of property parameters.

int hasOverrides()

Returns a value indicating if the property has at least one overriden parameter.

Return value

1 if the property has at least one overriden parameter; otherwise, 0.

int findParameter(const char * name)

Searches for a parameter by the given name among all parameters of the current property and also among all parameters of the parent property that aren't overridden in the current property.

Arguments

const char * name - Name of the parameter.

Return value

The number of the parameter, if it is found; otherwise, -1.

int fetchParameter(const char * name, int fast_id)

Searches for a parameter by a given name among all parameters of the property.

Arguments

const char * name - Parameter name.
int fast_id - Parameter number in users auxiliary parameters cache. The value must be in the range [0; 128].

Return value

Parameter number, if it is found; otherwise, -1.

bool setParameter(int num, const Variable & value)

Updates the value of the given parameter.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Variable & value - New value of the parameter.

Variable getParameter(int num)

Returns the value of the given parameter.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the parameter.

const char * getParameterGroup(int num)

Returns the name of the group, to which the specified property parameter belongs. Property parameters are displayed in groups in the Parameters window of the UnigineEditor.

Arguments

int num - Parameter number.

Return value

Name of the group to which the specified property parameter belongs.

const char * getParameterFilter(int num)

Returns the filter string associated with the specified property parameter. This string specifies a filter for file, material or property parameter values thet will be used in the UnigineEditor. For example, you can specify ".xml|.node|.txt" to filter certain types of assets, or specify a base material to filter out materials, that cannot be used in a particular case (e.g. to avoid an attempt of assigning a post material to a mesh).

Notice

This attribute is available only for file, material and property parameter types.

Arguments

int num - Parameter number.

Return value

String specifying a filter for file, material or property parameter values.

const char * getParameterTitle(int num)

Returns the title of the specified property parameter. This title is displayed in the UnigineEditor's UI.

Arguments

int num - Parameter number.

Return value

Title of the specified property parameter.

const char * getParameterTooltip(int num)

Returns the tooltip of the specified property parameter. This tooltip is displayed in the UnigineEditor, when user hovers a mouse over the property field.

Arguments

int num - Parameter number.

Return value

Tooltip text of the specified property parameter.

void setParameterFile(int num, const char * value)

Updates the value of the given file parameter. If the property is not editable, the value won't be updated.

The value stored in the file parameter (this value will be returned by the getParameterFile() method) depends on the flags set for the parameter:

Source code (C++)

// flags = "asset"
setParameterFile("guid://asset_guid"); 		// getParameterFile() -> asset_path
setParameterFile("guid://runtime_guid");	// getParameterFile() -> asset_path
setParameterFile("asset_path");				// getParameterFile() -> asset_path
setParameterFile("runtime_path");			// getParameterFile() -> asset_path

// flags = "runtime" - default
setParameterFile("guid://asset_guid"); 		// getParameterFile() -> runtime_path
setParameterFile("guid://runtime_guid");	// getParameterFile() -> runtime_path
setParameterFile("asset_path");				// getParameterFile() -> runtime_path
setParameterFile("runtime_path");			// getParameterFile() -> runtime_path

// flags = "abspath"
setParameterFile(file_path);				// getParameterFile() -> file_path

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const char * value - New value for the file parameter.

const char * getParameterFile(int num)

Returns the current value of the given file parameter.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Current file parameter value depending on the flags set for the parameter:

Source code (C++)

// flags = "asset"
setParameterFile("guid://asset_guid"); 		// getParameterFile() -> asset_path
setParameterFile("guid://runtime_guid");	// getParameterFile() -> asset_path
setParameterFile("asset_path");				// getParameterFile() -> asset_path
setParameterFile("runtime_path");			// getParameterFile() -> asset_path

// flags = "runtime" - default
setParameterFile("guid://asset_guid"); 		// getParameterFile() -> runtime_path
setParameterFile("guid://runtime_guid");	// getParameterFile() -> runtime_path
setParameterFile("asset_path");				// getParameterFile() -> runtime_path
setParameterFile("runtime_path");			// getParameterFile() -> runtime_path

// flags = "abspath"
setParameterFile(file_path);				// getParameterFile() -> file_path

Notice

To get a GUID of the file, use the getParameterGUID() method.

int getParameterFileIsAsset(int num)

Returns a value indicating if the specified file parameter stores a reference to an asset file.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the specified file parameter stores a reference to an asset file; otherwise, 0.

int getParameterFileIsRuntime(int num)

Returns a value indicating if the specified file parameter stores a reference to a runtime file.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the specified file parameter stores a reference to a runtime file; otherwise, 0.

int getParameterFileIsAbsPath(int num)

Returns a value indicating if the specified file parameter stores an absolute file path.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if the specified file parameter stores an absolute file path; otherwise, 0.

int isParameterFileExist(int num)

Returns a value indicating if a file corresponding to the specified file parameter of the property exists.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

1 if a file corresponding to the specified property parameter exists; otherwise, 0.

void setParameterMaterial(int num, const Ptr<Material> & value)

Updates the value of the given material parameter. If the PARAMETER_MATERIAL variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Ptr<Material> & value - Material smart pointer to be set as a value of the specified parameter.

Ptr<Material> getParameterMaterial(int num)

Returns the current value of the given material parameter. If the PARAMETER_MATERIAL variable isn't set for the parameter, the function will return NULL.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Material smart pointer currently set as a value of the specified parameter.

void setParameterProperty(int num, const Ptr<Property> & value)

Updates the value of the given property parameter. If the PARAMETER_PROPERTY variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Ptr<Property> & value - Property smart pointer to be set as a value of the specified parameter.

Ptr<Property> getParameterProperty(int num)

Returns the current value of the given property parameter. If the PARAMETER_PROPERTY variable isn't set for the parameter, the function will return NULL.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Property smart pointer currently set as a value of the specified parameter.

void setParameterColor(int num, const Math::vec4 & value)

Updates a value of the given color parameter. If the PARAMETER_COLOR variable isn't set for the parameter, the color value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Math::vec4 & value - New value for the color parameter.

Math::vec4 getParameterColor(int num)

Returns the current color set for the given color parameter. If the PARAMETER_COLOR variable isn't set for the parameter, the function will return (0,0,0,0).

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Color value of the color parameter. If an error occurs, (0,0,0,0) will be returned.

void setParameterDouble(int num, double value)

Updates the value of the given double parameter. If the PARAMETER_DOUBLE variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
double value - New value for the double parameter.

double getParameterDouble(int num)

Returns the current value of the given double parameter. If the PARAMETER_DOUBLE variable isn't set for the parameter, the function will return 0.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the douuble parameter.

double getParameterDoubleMaxValue(int num)

Returns the maximum allowed value of the given double parameter. If the PARAMETER_DOUBLE variable isn't set for the parameter, the function will return 1.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Maximum allowed value of the double parameter.

double getParameterDoubleMinValue(int num)

Returns the minimum allowed value of the given double parameter. If the PARAMETER_DOUBLE variable isn't set for the parameter, the function will return 0.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Minimum allowed value for the double parameter.

void setParameterFloat(int num, float value)

Updates the value of the given float parameter. If the PARAMETER_FLOAT variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
float value - New value of the float parameter.

float getParameterFloat(int num)

Returns the current value of the given float parameter. If the PARAMETER_FLOAT variable isn't set for the parameter, the function will return 0.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the float parameter.

float getParameterFloatMaxValue(int num)

Returns the maximum allowed value of the given float parameter. If the PARAMETER_FLOAT variable isn't set for the parameter, the function will return 1.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Maximum allowed value of the float parameter.

float getParameterFloatMinValue(int num)

Returns the minimum allowed value of the given float parameter. If the PARAMETER_FLOAT variable isn't set for the parameter, the function will return 0.0f.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Minimum allowed value of the float parameter.

void setParameterGUID(int num, const UGUID & value)

Updates the value of the given file, material, or property parameter using the specified GUID. If the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const UGUID & value - New GUID value for the specified parameter.

UGUID getParameterGUID(int num)

Returns the current value of the given file, material, or property parameter as a GUID (i.e. a GUID of a material, a property or a file will be returned).

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the specified parameter as a GUID.

void setParameterNode(int num, const Ptr<Node> & value)

Updates the value of the given Node parameter. If the PARAMETER_NODE variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Ptr<Node> & value - Node smart pointer to be set as a value of the specified parameter.

Ptr<Node> getParameterNode(int num)

Returns the current value of the given Node parameter. If the PARAMETER_NODE variable isn't set for the parameter, the function will return NULL.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Node smart pointer currently set as a value of the specified parameter.

void setParameterNodeID(int num, int value)

Updates the value of the given Node parameter by the specified node ID. If the PARAMETER_NODE variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int value - ID of a node to be set as a value of the specified parameter.

int getParameterNodeID(int num)

Returns the current value of the given Node parameter. If the PROPERTY_PARAMETER_NODE variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

ID of a node currently set as a value of the specified parameter.

void setParameterInt(int num, int value)

Updates the value of the given integer parameter. If the PARAMETER_INT variable isn't set for the parameter, or the property is not editable, the value won't be updated.

For example, the values of collision and intersection parameters for the property inherited from the surface_base can be set as follows:

Source code (C++)

property->setParameterInt(property->findParameter("collision"), 1);
property->setParameterInt(property->findParameter("intersection"), 1);

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int value - New value for the integer parameter.

int getParameterInt(int num)

Returns the current value of the given integer parameter. If the PARAMETER_INT variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the integer parameter.

int getParameterIntMaxValue(int num)

Returns the maximum allowed value of the given integer parameter. If the PARAMETER_INT variable isn't set for the parameter, the function will return 1.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Maximum allowed value of the integer parameter.

int getParameterIntMinValue(int num)

Returns the minimum allowed value of the given integer parameter. If the PARAMETER_INT variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Minimum allowed value of the integer parameter.

void setParameterMask(int num, int value)

Updates a value of the given mask parameter. If the PARAMETER_MASK variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int value - New value for the mask parameter.

int getParameterMask(int num)

Returns the current value set for the given mask parameter. If the PARAMETER_MASK variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the mask parameter. If an error occurs, 0 will be returned.

const char * getParameterName(int num)

Returns the name of the given property's parameter name.

Arguments

int num - The number of the target parameter in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

Name of the parameter.

int getParameterSliderLog10(int num)

Returns a value indicating if the given slider parameter of the current property uses a logarithmic scale (with the base ten). The slider parameter is a parameter of one of the following types: PARAMETER_INT, PARAMETER_FLOAT, PARAMETER_DOUBLE.

Arguments

int num - The number of the slider parameter in range from 0 to the total number of the property's parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

1 if the parameter uses a logarithmic scale; otherwise, 0.

int getParameterSliderMaxExpand(int num)

Returns a value indicating if the maximum value of the given slider parameter can be increased. The slider parameter is a parameter of one of the following types: PARAMETER_INT, PARAMETER_FLOAT, PARAMETER_DOUBLE.

Arguments

int num - The number of the slider parameter in range from 0 to the total number of the property's parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

1 if the maximum value can be changed; otherwise, 0.

int getParameterSliderMinExpand(int num)

Returns a value indicating if the minimum value of the given slider parameter can be decreased. The slider parameter is a parameter of one of the following types: PARAMETER_INT, PARAMETER_FLOAT, PARAMETER_DOUBLE.

Arguments

int num - The number of the slider parameter in range from 0 to the total number of the property's parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

1 if the minimum value can be changed; otherwise, 0.

int hasParameterSliderMaxValue(int num)

Returns a value indicating if a slider parameter with a given number has the maximum value specified.

Arguments

int num - The number of the slider parameter in range from 0 to the total number of the property's parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

1 if a slider parameter with a given number has the maximum value specified; otherwise, 0.

int hasParameterSliderMinValue(int num)

Returns a value indicating if a slider parameter with a given number has the minimum value specified.

Arguments

int num - The number of the slider parameter in range from 0 to the total number of the property's parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

1 if a slider parameter with a given number has the minimum value specified; otherwise, 0.

void setParameterString(int num, const char * value)

Updates the value of the given string parameter. If the PARAMETER_STRING variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const char * value - New value for the string parameter.

const char * getParameterString(int num)

Returns the current value of the given string parameter. If the PARAMETER_STRING variable isn't set for the parameter, the function will return NULL.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the string parameter.

void setParameterSwitch(int num, int value)

Updates the value of the given switch parameter. If the PARAMETER_SWITCH variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int value - New value for the switch parameter.

int getParameterSwitch(int num)

Returns the current value of the given switch parameter. If the PARAMETER_SWITCH variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the switch parameter.

const char * getParameterSwitchItem(int num, int item)

Returns the value of the item of the given switch parameter. If the PARAMETER_SWITCH variable isn't set for the parameter, the function will return NULL.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int item - The number of the item of the switch parameter.

Return value

Value of the item. If an error occurs, NULL will be returned.

int getParameterSwitchNumItems(int num)

Returns the number of items of the given switch parameter. If the PARAMETER_SWITCH variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Number of the items of the switch parameter.

void setParameterToggle(int num, int value)

Updates the value of the given toggle parameter. If the PARAMETER_TOGGLE variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
int value - New value of the toggle parameter.

int getParameterToggle(int num)

Returns the current value of the given toggle parameter. If the PARAMETER_TOGGLE variable isn't set for the parameter, the function will return 0.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the toggle parameter.

int getParameterType(int num)

Returns the type of the given parameter.

Arguments

int num - The number of the target parameter in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account).

Return value

One of the PARAMETER_* pre-defined variables; if an error occurs, -1 will be returned.

void setParameterVec3(int num, const Math::vec3 & value)

Updates the value of the given vector (vec3) parameter. If the PARAMETER_VEC3 variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Math::vec3 & value - New value for the vector (vec3) parameter.

Math::vec3 getParameterVec3(int num)

Returns the current value of the given vector (vec3) parameter. If the PARAMETER_VEC3 variable isn't set for the parameter, the function will return (0,0,0).

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the vector (vec3) parameter.

void setParameterVec4(int num, const Math::vec4 & value)

Updates the value of the given vector (vec4) parameter. If the PARAMETER_VEC4 variable isn't set for the parameter, or the property is not editable, the value won't be updated.

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.
const Math::vec4 & value - New value for the vector (vec4) parameter.

Math::vec4 getParameterVec4(int num)

Returns the current value of the given vector (vec4) parameter. If the PARAMETER_VEC4 variable isn't set for the parameter, the function will return (0,0,0,0).

Arguments

int num - Parameter number in range from 0 to the total number of the property parameters (including parameters of its parent; if a parameter of the current property overrides the parent property's parameter, the parent property's parameter isn't taken into account). New parameters are added to the end of the parameters list.

Return value

Value of the vector (vec4) parameter.

void resetParameter(int num)

Resets the overriden value of the given parameter to the parent's value.

Arguments

int num - Parameter number.

Ptr<Property> getParent()

Returns the parent property.

Return value

Parent property smart pointer.

int isParent(const char * name)

Returns a value indicating if the property with the given name is a parent of this property.

Suppose we have the following two manual properties in our project:

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" name="my_prop" parent_name="surface_base" manual="1">
	<parameter name="my_parameter">100</parameter>
</property>

Source code (XML)

<?xml version="1.0" encoding="utf-8"?>
<property version="2.7.0.1" name="my_prop_0" parent_name="my_prop" manual="1">
	<parameter name="my_parameter1">101</parameter>
	<parameter name="my_parameter2">101</parameter>
</property>

The following code will return 1 as the my_prop property is the parent of the my_prop_0 property:

Source code (C++)

// get a property named my_prop_0
PropertyPtr property = Properties::get()->findManualProperty("my_prop_0");
// perform parent check
Log::message("%d\n",property->isParent("my_prop"));

Arguments

const char * name - Parent property name.

Return value

1 if the property with the given name is a parent of this property; otherwise, 0.

int isParent(const UGUID & guid)

Returns a value indicating if the property with the given GUID is a parent of this property.

Arguments

const UGUID & guid - Parent property GUID.

Return value

1 if the property with the given GUID is a parent of this property; otherwise, 0.

int setParent(const Ptr<Property> & property, int save_all_values = 0)

Sets the given property as the parent for this property and saves the parameter values of the property (if the corresponding flag is set).

Notice

The method is not available for manual and non-editable properties.

Arguments

const Ptr<Property> & property - Property to be set as the parent for this property.
int save_all_values - Flag indicating if parameter values of the property will be saved after reparenting.

Return value

1 if the given property was successfully set as the parent for this property; otherwise, 0.

void setPath(const char * path)

Sets a new path for the property.

Arguments

const char * path - New path to the property file.

void setFileGUID(const UGUID & fileguid)

Sets a new GUID for the property file.

Arguments

const UGUID & fileguid - New GUID for the property file.

UGUID getFileGUID()

Returns the current GUID of the property file.

Return value

GUID of the property file.

const char * getPath()

Returns a path to the property.

Return value

Path to the property.

Ptr<Property> clone()

Clones the property. The cloned property won't have a name, a path and won't be displayed in the properties hierarchy.

Return value

Cloned property smart pointer.

Ptr<Property> clone(const char * name, const char * path)

Clones the property and assigns the specified name and path to the clone. The cloned property will be saved to the specified path on saveProperties() call. This method may be used, for example, to create a property missed during project's migration.

Arguments

const char * name - Cloned property name.
const char * path - Path to save the cloned property.

Return value

Cloned property smart pointer.

Ptr<Property> clone(const char * name, const char * path, const UGUID & guid)

Clones the property and assigns the specified name, GUID and path to the clone. The cloned property will be saved to the specified path on saveProperties() call. This method may be used, for example, to create a property missed during project's migration.

Arguments

const char * name - Cloned property name.
const char * path - Path to save the cloned property.
const UGUID & guid - Cloned property GUID.

Return value

Cloned property smart pointer.

Ptr<Property> clone(const char * name)

Clones the property.

Source code (UnigineScript)

// get a property to be cloned
Properties *properties = Properties::get();
PropertyPtr property = properties->findProperty("surface_base_0");
// clone the property
PropertyPtr cloned = property->clone("cloned_surface_base_0");
// perform something on the cloned pointer
// ...
// delete the pointer
cloned.grab();
cloned.destroy();

Arguments

const char * name - Cloned property name.

Return value

Cloned property smart pointer.

void grab()

Sets the owner flag to 1 for the Property pointer. The Property should not be handled by the class after this function is called

int isOwner()

Returns the owner flag. If the pointer is the owner, on its deletion the property also will be deleted. Use grab() and release() functions to change ownership.

Return value

The owner flag.

void release()

Releases the Property (sets the owner flag to 0 for the pointer). The Property should be handled by the class after this function is called.

Ptr<Property> inherit()

Inherits a new property from this one. The inherited property will be empty: it won't have a name, a path and won't be displayed in the properties hierarchy.

Return value

Inherited property smart pointer.

Ptr<Property> inherit(const char * name)

Inherits a new property from this one and assigns the specified name to it.

Arguments

const char * name - Inherited property name.

Return value

Inherited property smart pointer.

Ptr<Property> inherit(const char * name, const char * path)

Inherits a new property from this one and assigns the specified name and path to it. The inherited property will be saved to the specified path on saveProperties() call.

Arguments

const char * name - Inherited property name.
const char * path - Path to save the inherited property.

Return value

Inherited property smart pointer.

Ptr<Property> inherit(const char * name, const char * path, const UGUID & guid)

Inherits a new property from this one and assigns the specified name, GUID and path to it. The inherited property will be saved to the specified path on saveProperties() call.

Arguments

const char * name - Inherited property name.
const char * path - Path to save the inherited property.
const UGUID & guid - Inherited property GUID.

Return value

Inherited property smart pointer.

int load()

Loads the property from the file specified by the setPath() function.

NoticeThis function can be used to load properties created during application execution or stored outside the data directory.

Return value

1 if the property data is loaded successfully; otherwise, 0.

int load(const char * path)

Loads the property from the specified *.prop file.

Arguments

const char * path - Path to the *.prop file to load the property data from.

Return value

1 if the property data is loaded successfully; otherwise, 0.

int loadXml(const Ptr<Xml> & xml)

Loads data of the property (all its parameters) from the given instance of the Xml class.

Arguments

const Ptr<Xml> & xml - Xml class instance in which the property data is stored.

Return value

1 if the property data is loaded successfully; otherwise, 0.

int loadWorld(const Ptr<Xml> & xml)

Loads data of the current property (all its options, states and parameters) from the given instance of the Xml class.

Arguments

const Ptr<Xml> & xml - Xml class instance in which the property data is stored.

Return value

1 if the property data is loaded successfully; otherwise, 0.

int reload()

Reloads the property and all its children.

Return value

1 if the property is reloaded successfully; otherwise, 0.

int restoreState(const Ptr<Stream> & stream, int force = 0)

Restores data of the current property (all its parameters) from a binary stream.

Arguments

const Ptr<Stream> & stream - The stream in which the saved property data is stored.
int force - A value indicating if forced restoring of property data is used: 1 to enable forced saving, 0 to disable it.

Return value

1 if the property data is restored successfully; otherwise, 0.

int canSaveInFile()

Returns a value indicating if the property can be saved to a file. For example, this function will return 0 for an internal or manual property.

Return value

1 if the property can be saved to a file; otherwise, 0.

int saveState(const Ptr<Stream> & stream)

Saves data of the current property (all its parameters) into a binary stream.

Arguments

const Ptr<Stream> & stream - Stream into which the property data will be saved.

Return value

1 if the property data is saved successfully; otherwise, 0.

int save()

Saves the property data to the file specified by the setPath() function.

Notice

This method is not available for manual and internal properties.

Return value

1 if the property data is saved successfully; otherwise, 0.

int save(const char * path)

Saves the property data to the specified *.prop file.

Notice

This method is not available for manual properties.

Arguments

const char * path - Path to the *.prop file to save the property data to.

Return value

1 if the property data is saved successfully; otherwise, 0.

int saveXml(const Ptr<Xml> & xml)

Saves data of the property (all its parameters) to the given instance of the Xml class.

Notice

This method is not available for manual properties.

Arguments

const Ptr<Xml> & xml - Xml class instance into which the property data will be saved.

Return value

1 if the property data is saved successfully; otherwise, 0.

int saveWorld(const Ptr<Xml> & xml, int force = 0)

Saves data of the current property (all its parameters) into the given instance of the Xml class.

Arguments

const Ptr<Xml> & xml - Xml class instance into which the property data will be saved.
int force - A value indicating if forced saving of property data is used: 1 to enable forced saving, 0 to disable it.

Return value

1 if the property data is saved successfully; otherwise, 0.

int addCallback(int callback, Unigine::CallbackBase * func)

Adds a callback of the specified type. Callback functions can be used to determine actions to be performed when any changes to the property are made. The signature of the callback function can be one of the following:

Source code (C++)

// for the CALLBACK_PARAMETER_CHANGED type
void callback_function_name(PropertyPtr property, int parameter_num);

// for all other types
void callback_function_name(PropertyPtr property);

Here is an example of tracking property parameter changes via callbacks:

Source code (C++)

void parameter_changed(PropertyPtr property, int num)
{
	Log::message("Parameter \"%s\" of the property \"%s\" has changed its value.\n", property->getParameterName(num), property->getName());
    // ...
}

// somewhere in the code

// inheriting a new property named "my_prop" from the base property "surface_base" via the Property Manager
PropertyPtr property = Properties::get()->findManualProperty("surface_base")->inherit("my_prop");

// setting our callback function on parameter change
property->addCallback(Property::CALLBACK_PARAMETER_CHANGED, MakeCallback(parameter_changed));

// changing the value of the "collision" parameter
property->setParameterInt(property->findParameter("collision"), 0);

Arguments

int callback - Callback type. One of the CALLBACK_* variables.
Unigine::CallbackBase * func - Callback pointer.

Return value

Number of the last added callback of the specified type, if the callback was added successsfully; otherwise, -1.

void removeCallback(int callback, int num)

Removes a callback with the given number from the list of callbacks of the specified type. Callback functions can be used to determine actions to be performed when any changes to the property are made.

Arguments

int callback - Callback type. One of the CALLBACK_* variables.
int num - Callback number.

void clearCallbacks(int callback)

Clears all added callbacks of the specified type. Callback functions can be used to determine actions to be performed when any changes to the property are made.

Arguments

int callback - Callback type. One of the CALLBACK_* variables.

int PARAMETER_COLOR

Description

Type of the property parameter that allows specifying the material color (a vec4 value).

int PARAMETER_DOUBLE

Description

Type of the property parameter that allows accepting any double value in a given range.

int PARAMETER_FLOAT

Description

Type of the property parameter that allows accepting float value in a given range.

int PARAMETER_FILE

Description

Type of the property parameter that allows accepting any file GUID value.

int PARAMETER_INT

Description

Type of the property parameter that allows accepting any integer value in a given range.

int PARAMETER_MASK

Description

Type of the property parameter that allows specifying a mask (an integer value).

int PARAMETER_MATERIAL

Description

Type of the property parameter that allows accepting any material GUID value.

int PARAMETER_NODE

Description

Type of the property parameter that allows accepting any Node.

int PARAMETER_PROPERTY

Description

Type of the property parameter that allows accepting any property GUID value.

int PARAMETER_STRING

Description

Type of the property parameter that allows accepting any string value.

int PARAMETER_SWITCH

Description

Type of the property parameter that allows specifying a set of several possible values (more than 2).

int PARAMETER_TOGGLE

Description

Type of the property parameter that allows only 2 possible values.

int PARAMETER_VEC3

Description

Type of the property parameter that allows accepting any vec3 value.

int PARAMETER_VEC4

Description

Type of the property parameter that allows accepting any vec4 value.

int CALLBACK_DESTROY

Description

Property destroy callback. This callback is fired when the property is destroyed.

int CALLBACK_PARAMETER_CHANGED

Description

Property parameter changed callback. This callback is fired when the value of any parameter of the property is changed or reset to default.

int CALLBACK_REPARENTED

Description

Property reparented callback. This callback is fired when the parent of the property is changed.

int CALLBACK_RENAMED

Description

Property renamed callback. This callback is fired when the name of the property is changed.

int CALLBACK_MOVED

Description

Property moved callback. This callback is fired when the path of the property is changed.

int CALLBACK_RELOADED

Description

Property reloaded callback. This callback is fired when the property is reloaded.

Last update: 04.06.2018

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Unigine::Property Class

List of functions:

List of Variables:

Adding and Removing Properties

Adding Callbacks

Property Class

Members

Property()

Ptr<Property> getChild(int num)

Arguments

Return value

int getID()

Return value

UGUID getGUID()

Return value

int isBase()

Return value

void setEditable(int editable)

Arguments

int isEditable()

Return value

int isHidden()

Return value

int isEngine()

Return value

int isInternal()

Return value

int isManual()

Return value

int isHierarchyValid()

Return value

int isParameterInherited(int num)

Arguments

Return value

int isParameterHidden(int num)

Arguments

Return value

int isParameterOverridden(int num)

Arguments

Return value

void setName(const char * name)

Arguments

const char * getName()

Return value

int getNumChildren()

Return value

int getNumParameters()

Return value

int hasOverrides()

Return value

int findParameter(const char * name)

Arguments

Return value

int fetchParameter(const char * name, int fast_id)

Arguments

Return value

bool setParameter(int num, const Variable & value)

Arguments

Variable getParameter(int num)

Arguments

Return value

const char * getParameterGroup(int num)

Arguments

Return value

const char * getParameterFilter(int num)

Arguments

Return value

const char * getParameterTitle(int num)

Arguments

Return value

const char * getParameterTooltip(int num)

Arguments

Return value

void setParameterFile(int num, const char * value)

Arguments

const char * getParameterFile(int num)

Arguments

Return value

int getParameterFileIsAsset(int num)

Arguments