problem loading UI files

[RVargas]

This is a stupid question, Im sure Im doing something wrong here. I have an empty world test.world and this test.cpp:

 

Gui gui;				// gui
UserInterface ui;

int init() {
   create_scene();
   return 1;
}


void create_scene() {
gui = engine.getGui();
ui = engine.gui.addUserInterface(gui,"test.ui");
return "";
}

 

This is test.ui

 

<?xml version="1.0" encoding="utf-8"?>
<ui version="1.0">

<button name="test_butt" pos_x="10" pos_y="10" export="1"/>

</ui>

 

But when I run it, I get this error:

 

Loading "test.cpp" 0ms
Loading "test.world" 0ms
Interpreter::setVariable(): unknown variable "test_butt"

 

Whats my mistake here? I have been looking in the demos and I cant see any extra step that I could be missing.

[ulf.schroeter]

No GUI knowledge at all, so just a blind guess: Widgets (e.g. button) might have to be embedded into Containers (e.g. window, vbox). See docmentation section "Programming\Gui\UI Files" and search within SDK data subdirectory for *.ui samples.

 

Maybe something like

 

<?xml version="1.0" encoding="utf-8"?>
<ui version="1.0">

<window name="window" /* required parameters */>
   <button name="test_butt" pos_x="10" pos_y="10" export="1"/>
</window>

</ui>

[RVargas]

Nope, that just added another error: Interpreter::setVariable(): unknown variable "window", besides the one for test_butt. tried copying ui_01.ui from samples and I got the same error for each widget declared there.

[ulf.schroeter]

Nope, that just added another error: Interpreter::setVariable(): unknown variable "window", besides the one for test_butt. tried copying ui_01.ui from samples and I got the same error for each widget declared there.

 

Post your test scene as zip file, I will take a look into engine source

[RVargas]

The world is empty:

 

test.world

<?xml version="1.0" encoding="utf-8"?>
<world version="1.12"/>

 

Also I have experienced this error on every application I have made with unigine, with empty worlds or not.

[ulf.schroeter]

Solution is to define corresponding widget variable with same name as stated in export argument in test.cpp

 

WidgetButton test_butt;     // will be initialized by engine.gui.addUserInterface(gui,"test.ui") call

Gui gui;		
UserInterface ui;

int init() {
   create_scene();
   return 1;
}

void create_scene() {
gui = engine.getGui();
ui = engine.gui.addUserInterface(gui,"test.ui");
return "";
}

[RVargas]

Hmm, that crossed my mind, but it wasnt explicitly explained in the manual, so I thought it was a bad idea.

[RVargas]

Ok! That fixed the error, but still the button is not visible.

[ulf.schroeter]

Ok! That fixed the error, but still the button is not visible.

 

Maybe you have to set button text. Also there are working samples data\widgets\ui_00/01

[RVargas]

Nope, setting the text doesnt fix it. Button still invisible.

[eugene.litvinov]

Maybe you use different namespaces in your class/package and ui-layout? (Try use custom package, not global)

Correct ui-part:

<vbox name="Source::MainMenu::mainPanel" export="1">
<sprite align="background" texture="source/textures/gui/window.png"/>

Package-part:

namespace Source
{
namespace MainMenu
{
	WidgetVBox mainPanel;

 

Also see data\samples\widgets\ for template

[RVargas]

Again, no buttons.

Here are my project files with latest updates:

 

test.cpp:

namespace Testing {

WidgetButton test_butt;

Gui gui;				// gui
UserInterface ui;

int init() {
   create_scene();
   return 1;
}

void test_callback() {
   printf("test \n");
}

int update(){
   return 1;
}

void create_scene() {
gui = engine.getGui();
ui = engine.gui.addUserInterface(gui,"test.ui");
       test_butt.setCallback(GUI_CLICKED,"test_callback");   
return "";
}

}

 

test.ui:

<?xml version="1.0" encoding="utf-8"?>
<ui version="1.0">

<button name="Testing::test_butt" pos_x="10" pos_y="10" export="1">
	<text>Press me</text>
</button>
<button align="overlap" pos_x="80" pos_y="110">
	<text>Press me 2</text>
	<callback type="clicked">Testing::test_callback</callback>
</button>
</ui>

 

and an empty world, test.world:

<?xml version="1.0" encoding="utf-8"?>
<world version="1.12"/>

[RVargas]

Well, seems that the problem is not related to UI files only. Added a button in code and it is not visible neither:

 

test_butt2 = new WidgetButton(gui,"Next");
   test_butt2.setPosition(20, 80);
   gui.addChild(test_butt2,GUI_ALIGN_OVERLAP);

 

also tried adding a PlayerSpectator and creating lights, but didnt worked. Do i need to include some specific unigine header or something?

[eugene.litvinov]

You need to add your button to gui also:

void create_scene() {
       gui = engine.getGui();
       ui = engine.gui.addUserInterface(gui,"test.ui");

       gui.addChild(test_butt, GUI_ALIGN_OVERLAP); // add your button 

       test_butt.setCallback(GUI_CLICKED,"test_callback");   
       return "";
}

[RVargas]

That solved the problem. And the previous post about missing button when created via code, solved too, when I removed the namespace. Weird, isnt it?

Now, isnt UI files suppossed to do all that work for me? If I have to create the variables and also add them manually to the gui, then Im just saving a couple of lines for each gui element.

[eugene.litvinov]

That solved the problem. And the previous post about missing button when created via code, solved too, when I removed the namespace. Weird, isnt it?

Now, isnt UI files suppossed to do all that work for me? If I have to create the variables and also add them manually to the gui, then Im just saving a couple of lines for each gui element.

Yes, you are. Also you could describe all form in UI with one root element, for example:

<vbox name="Source::MainMenu::mainPanel" export="1">

<button name="Testing::test_butt" pos_x="10" pos_y="10" export="1">
               <text>Press me</text>
       </button>
<button align="overlap" pos_x="80" pos_y="110">
               <text>Press me 2</text>
               <callback type="clicked">Testing::test_callback</callback>
       </button>

<button name="Testing::test_butt2" pos_x="10" pos_y="10" export="1">
               <text>Press me</text>
       </button>
<button align="overlap" pos_x="80" pos_y="110">
               <text>Press me 2</text>
               <callback type="clicked">Testing::test_callback</callback>
       </button>
</vbox>

 

and then you need use only:

gui.addChild(mainPanel, GUI_ALIGN_OVERLAP); // add all your buttons with container

and all you buttons will be added automatically