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Creating Your First Editor Plugin

This article describes how to create an Editor plugin and get the first impression of what a plugin consists of and what its general structure is.

Warning
This feature is an experimental one and is not recommended for production use.

UnigineEditor is an application written entirely in C++ relying a lot on the Qt5 framework infrastructure. So, in order to extend its functionality not only C++ programming skills are required, but you should also be familiar with the Qt5 framework, and CMake build system (especially if you use Linux).

Notice
Qt Framework version 5.12.3 is required to develop plugins for UnigineEditor. More information on setting up development environment for this purpose is available in this article.

See Also#

Plugin Templates#

For your convenience there are three project templates (Engine GUI Window, Assets, and Materials) that you can use as a basis to create your own plugin. Below you'll find a brief description of each template.

Materials Plugin#

This plugin template implements the basic functionality of the Editor's Materials Hierarchy window (see the picture below).

Notice
Only Release version of this plugin template is available.

Materials Plugin

Materials Plugin

Basically the plugin's architecture looks as follows:

Materials Plugin Architecture

Materials Plugin

The MaterialsPlugin class is an initialization point and complete representation of the plugin. It creates necessary data model and via the base interface associates it with the widget, which displays the hierarchy. The model directly interacts with the Materials Manager and transforms information on materials to the required structure.

The plugin interacts with Engine Materials System and Editor's external subsystems:

  • Adds a widget to WindowManager.
  • Adds a new item to the main menu bar.
  • Updates the state of materials widget when the global selection is changed.
  • Updates the global selection when the local selection is changed by sending a SelectionAction to the Undo stack.

Engine Gui Window Plugin#

This plugin template implements a simple dockable window of the UnigineEditor with a simple GUI example that displays the current selection in the World Nodes hierarchy window, and enables you to assign a C++ component to selected nodes (see the picture below).

Engine Gui Window Plugin

Engine Gui Window Plugin

The EngineGuiWindowPlugin class is an initialization point and complete representation of the plugin.

The plugin interacts with Editor's external subsystems:

  • Adds a widget to WindowManager.
  • Adds a new item to the main menu bar.
  • Interacts with Editor's Drag&Drop System and enables dragging and dropping files within the window area, prints their names to the Console.
  • Monitors current window focus state.
  • Updates the global selection when the local selection is changed by sending a SelectionAction to the Undo stack, when a node is selected and the Add components to selection! button is clicked.

And the following Engine subsystems:

  • C++ Component System
  • GUI System
  • Input System

Assets Plugin#

This is a sample plugin demonstrating implementation of basic asset management operations using the AssetManager class (see the picture below).

Assets Plugin

Assets Plugin

The AssetsPlugin class is an initialization point and complete representation of the plugin.

The plugin interacts with Editor's external subsystems:

  • Adds a widget to WindowManager.
  • Adds a new item to the main menu bar.
  • Interacts with Editor's AssetManager class, displays messages in the label element.
  • Monitors current selection state.
  • Updates the global selection after importing assets.

And the following Engine subsystems:

  • File System
  • GUI System
  • Input System

For more information about the Assets Plugin please refer to this article.

Using Plugin Template#

To start developing your plugin for UnigineEditor perform the following actions:

  1. Check the Editor Plugin Template option when creating a new project in SDK Browser (or choose Other Actions -> Configure Project if you want to use your new Editor plugin in an existing project).

    Adding a plugin template

  2. Click Create New Project (or Update Configuration if you're adding a template to an existing project).

After clicking the Create New Project / Update Configuration button, a set of projects for the Editor plugins will be added to your UNIGINE project's source folder and all necessary files will be added to these folders depending on your operating system and API + IDE selection in project settings:

  • Windows OS: C++ (Qt-based / CMake) or UnigineScriptCMake will be used to build your plugin.
  • Windows OS: C# (.NET) or C++ (Visual Studio) — a .vcxproj project will be created and Visual Studio 2015+ will be used to build your plugin.
  • LinuxCMake will be used to build your plugin regardless of project configuration.

You can open this project in your IDE, build it, and give it a test drive right in the Editor as the project is pre-configured to launch with the UnigineEditor.

Plugin's Logic Implementation#

Now let's have a quick look at the implementation of our plugin template's logic. As an example let's choose the Materials plugin.

Plugin Class#

The files MaterialsPlugin.h and MaterialsPlugin.cpp define the implementation of our plugin. Let's highlight some important points here.

Header File#

The header file MaterialsPlugin.h defines the interface of the plugin class.

MaterialsPlugin.h
namespace Materials
{

The plugin is defined in a Materials namespace, which conforms to the coding rules for namespacing in sources.

MaterialsPlugin.h
class MaterialsPlugin : public QObject, public ::UnigineEditor::Plugin
{
	Q_OBJECT
	Q_DISABLE_COPY(MaterialsPlugin)
	Q_PLUGIN_METADATA(IID UNIGINE_EDITOR_PLUGIN_IID FILE "MaterialsPlugin.json")
	Q_INTERFACES(UnigineEditor::Plugin)

All Editor plugins must be derived from Editor::Plugin class and are QObjects. The Q_PLUGIN_METADATA macro is necessary to create a valid Editor plugin. The IID given in the macro must be UNIGINE_EDITOR_PLUGIN_IID, to identify it as an Editor plugin, and FILE must point to the plugin's meta data file as described in Plugin Meta Data.

MaterialsPlugin.h
bool init() override;
void shutdown() override;

The base class defines basic functions that are called during the life cycle of a plugin (on initialization and shutdown), which are here implemented for your new plugin.

Our plugin has three additional custom slots, that are used show the view, set global selection and update the local one when the global is changed.

MaterialsPlugin.h
public slots:
	void showView();
	void setGlobalSelection(const QModelIndexList &indexes);
	void globalSelectionChanged();

MaterialsPlugin.h

MaterialsPlugin.h
#pragma once

#include <editor/UniginePlugin.h>

#include <QObject>
#include <QModelIndex>

namespace Materials
{

class MaterialsModel;
class MaterialsView;
}

class QAction;

namespace Materials
{
class MaterialsPlugin : public QObject, public ::UnigineEditor::Plugin
{
	Q_OBJECT
	Q_DISABLE_COPY(MaterialsPlugin)
	Q_PLUGIN_METADATA(IID UNIGINE_EDITOR_PLUGIN_IID FILE "MaterialsPlugin.json")
	Q_INTERFACES(UnigineEditor::Plugin)
public:
	MaterialsPlugin() = default;
	~MaterialsPlugin() override;
	bool init() override;
	void shutdown() override;
public slots:
	void showView();
	void setGlobalSelection(const QModelIndexList &indexes);
	void globalSelectionChanged();
private:
	MaterialsModel *model_{nullptr};
	MaterialsView *view_{nullptr};
	QAction *action_{nullptr};
};

} // namespace Materials

Implementation File#

This file contains the actual implementation of our plugin and its logic. For more information about implementing the plugin interface, see the Editor::Plugin API documentation and Plugin Life Cycle.

MaterialsPlugin.cpp

MaterialsPlugin.h
#include "MaterialsPlugin.h"
#include "MaterialsView.h"
#include "MaterialsModel.h"
#include "QtMetaTypes.h"

#include <editor/UnigineActions.h>
#include <editor/UnigineUndo.h>
#include <editor/UnigineConstants.h>
#include <editor/UnigineWindowManager.h>
#include <editor/UnigineSelection.h>
#include <editor/UnigineSelector.h>

#include <QObject>
#include <QMenu>

#include <algorithm>
#include <iterator>

using ::UnigineEditor::Selection;
using ::UnigineEditor::SelectionAction;
using ::UnigineEditor::WindowManager;
using ::UnigineEditor::SelectorGUIDs;

namespace Materials
{

MaterialsPlugin::~MaterialsPlugin() = default;

bool MaterialsPlugin::init()
{
	model_ = new MaterialsModel(this);

	view_ = new MaterialsView(model_);
	view_->setWindowTitle("Plugin - Material List");
	view_->setObjectName("PluginMaterialsView");
	WindowManager::add(view_, WindowManager::ROOT_AREA_LEFT);
	connect(view_, &MaterialsView::selected, this, &MaterialsPlugin::setGlobalSelection);

	QMenu *menu = WindowManager::findMenu(::UnigineEditor::Constants::MM_WINDOWS);
	action_ = menu->addAction("Plugin - Material List", this, &MaterialsPlugin::showView);

	connect(Selection::instance(), &Selection::changed,
			this, &MaterialsPlugin::globalSelectionChanged);

	return true;
}

void MaterialsPlugin::shutdown()
{
	QMenu *menu = WindowManager::findMenu(::UnigineEditor::Constants::MM_WINDOWS);
	menu->removeAction(action_);
	action_ = nullptr;

	disconnect(
		Selection::instance(), &Selection::changed, this, &MaterialsPlugin::globalSelectionChanged);

	disconnect(view_);
	WindowManager::remove(view_);

	delete view_;
	view_ = nullptr;

	delete model_;
	model_ = nullptr;
}

void MaterialsPlugin::showView()
{
	WindowManager::show(view_);
}

void MaterialsPlugin::setGlobalSelection(const QModelIndexList &indexes)
{
	disconnect(Selection::instance(), &Selection::changed,
			this, &MaterialsPlugin::globalSelectionChanged);

	Unigine::Vector<Unigine::UGUID> guids;
	guids.reserve(indexes.size());
	std::transform(std::begin(indexes), std::end(indexes), std::back_inserter(guids),
			[](const QModelIndex &idx)
			{ return idx.data(MaterialsModel::GUID_ROLE).value<Unigine::UGUID>(); });
	SelectionAction::applySelection(SelectorGUIDs::createMaterialsSelector(guids));

	connect(Selection::instance(), &Selection::changed,
			this, &MaterialsPlugin::globalSelectionChanged);
}

void MaterialsPlugin::globalSelectionChanged()
{
	using namespace std;

	if (auto selector = Selection::getSelectorMaterials())
	{
		const Unigine::Vector<Unigine::UGUID> &guids = selector->guids();
		QModelIndexList indexes;
		indexes.reserve(guids.size());
		transform(begin(guids), end(guids), back_inserter(indexes),
				[this](const Unigine::UGUID &guid) { return model_->index(guid); });

		auto it = remove(begin(indexes), end(indexes), QModelIndex());
		indexes.erase(it, end(indexes));

		QSignalBlocker blocker(view_);
		view_->globalSelectionChanged(indexes);
	}
	else if (auto selector = Selection::getSelectorRuntimes())
	{
		// implementation
	}
	else
	{
		view_->clearSelection();
	}
}

} // namespace Materials

Model Class#

Header File#

MaterialsModel.h

MaterialsModel.h
#pragma once

#include <QAbstractItemModel>

#include <UnigineGUID.h>

namespace Materials
{

class MaterialsModel final : public QAbstractItemModel
{
	class Item;
	Q_DISABLE_COPY(MaterialsModel)
public:
	enum Role
	{
		GUID_ROLE = Qt::UserRole + 1
	};

	explicit MaterialsModel(QObject *parent = nullptr);
	~MaterialsModel() override;

	QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
	QModelIndex index(const Unigine::UGUID &guid) const;
	QModelIndex parent(const QModelIndex &child) const override;
	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
	int columnCount(const QModelIndex &parent = QModelIndex()) const override;
	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;

protected:
	void fetchMore(const QModelIndex &parent) override;
	bool canFetchMore(const QModelIndex &parent) const override;

private:
	Item *const root_;
};

} // namespace Materials

Implementation File#

MaterialsModel.cpp

MaterialsModel.cpp
#include "MaterialsModel.h"
#include "QtMetaTypes.h"
#include <UnigineMaterials.h>
#include <UnigineFileSystem.h>

#include <QDebug>

using Unigine::UGUID;

namespace Materials
{

////////////////////////////////////////////////////////////////////////////////
// MaterialsModel::Item.
////////////////////////////////////////////////////////////////////////////////
class MaterialsModel::Item
{
public:
	static Item *createRootItem(MaterialsModel *model);

	Item(Item *parent, MaterialsModel *model, const UGUID &guid);
	~Item();

	QModelIndex index() const;

	void append(Item *item);
	Item *child(int idx);
	Item *find(const UGUID &guid) const;
	int childCount() const;

	Item *parent();
	int row() const;
	QVariant data(int role) const;

	void fetchMore();
	bool canFetchMore() const;

private:
	Item *parent_ = nullptr;			// not owned
	MaterialsModel *model_ = nullptr;	// not owned
	QVector<Item *> children_;			// owned
	UGUID guid_;
};

MaterialsModel::Item *MaterialsModel::Item::createRootItem(MaterialsModel *model)
{
	Item *root = new Item(nullptr, model, UGUID());
	const int size = Unigine::Materials::getNumMaterials();
	for (int i = 0; i < size; ++i)
	{
		const Unigine::MaterialPtr mat = Unigine::Materials::getMaterial(i);
		if (mat->isHidden())
		{
			continue;
		}
		if (const Unigine::MaterialPtr &parent_mat = mat->getParent())
		{
			if (!parent_mat->isHidden())
			{
				continue;
			}
		}
		root->children_.push_back(new Item(root, model, mat->getGUID()));
	}
	return root;
}

MaterialsModel::Item::Item(Item *parent, MaterialsModel *model, const UGUID &guid)
	: parent_(parent), model_(model), guid_(guid)
{
}

MaterialsModel::Item::~Item()
{
	qDeleteAll(children_);
}

QModelIndex MaterialsModel::Item::index() const
{
	if (!parent_ || guid_.isEmpty())
	{
		return QModelIndex();
	}
	return model_->createIndex(row(), 0, const_cast<Item *>(this));
}

void MaterialsModel::Item::append(Item *item)
{
	const int size = children_.size();
	model_->beginInsertRows(index(), size, size);
	item->parent_ = this;
	children_.push_back(item);
	model_->endInsertRows();
}

auto MaterialsModel::Item::child(int idx) -> Item *
{
	return ((idx >= 0) && (idx < children_.size()))
		? children_[idx]
		: nullptr;
}

auto MaterialsModel::Item::find(const UGUID &guid) const -> Item *
{
	for (Item *child: children_)
	{
		if (child->guid_ == guid)
		{
			return child;
		}
		if (child->canFetchMore())
		{
			child->fetchMore();
		}
		if (Item *grandchild = child->find(guid))
		{
			return grandchild;
		}
	}
	return nullptr;
}

int MaterialsModel::Item::childCount() const
{
	if (!guid_.isValid())
	{
		return children_.size();
	}

	const Unigine::MaterialPtr mat = Unigine::Materials::findMaterialByGUID(guid_);
	if (!mat)
	{
		// TODO: handle processes of adding new materials and removing old ones

		return 0;
	}

	int count = mat->getNumChildren();
	for (int i = count - 1; i >= 0; --i)
	{
		if (mat->getChild(i)->isHidden())
		{
			--count;
		}
	}
	return count;
}

MaterialsModel::Item *MaterialsModel::Item::parent()
{
	return parent_;
}

int MaterialsModel::Item::row() const
{
	if (parent_)
	{
		return parent_->children_.indexOf(const_cast<Item *>(this));
	}
	return 0;
}

QVariant MaterialsModel::Item::data(int role) const
{
	if (Qt::DisplayRole == role)
	{
		const Unigine::MaterialPtr &mat = Unigine::Materials::findMaterialByGUID(guid_);
		if (!mat)
		{
			// TODO: handle processes of adding new materials and removing old ones

			const QString name =
				tr("Removed - %1").arg(QLatin1String(guid_.getString()));
			return QVariant::fromValue(name);
		}

		const UGUID &file_mat_guid = Unigine::FileSystem::getGUID(mat->getPath());
		const UGUID &asset_guid = Unigine::FileSystemAssets::resolveAsset(file_mat_guid);
		const Unigine::String &virtual_path = Unigine::FileSystem::getVirtualPath(asset_guid);
		const Unigine::StringStack<> file_name = Unigine::String::filename(virtual_path);
		return QVariant::fromValue(QString(file_name.get()));
	}
	if (MaterialsModel::GUID_ROLE == role)
	{
		return QVariant::fromValue(guid_);
	}
	return QVariant();
}

void MaterialsModel::Item::fetchMore()
{
	const Unigine::MaterialPtr &mat = Unigine::Materials::findMaterialByGUID(guid_);
	if (!mat)
	{
		// TODO: handle processes of adding new materials and removing old ones
		
		return;
	}

	const int size = mat->getNumChildren();
	QVector<Item *> items;
	items.reserve(size);

	for (int i = 0; i < size; ++i)
	{
		const Unigine::MaterialPtr child_mat = mat->getChild(i);
		if (child_mat->isHidden())
		{
			continue;
		}
		items.push_back(new Item(this, model_, child_mat->getGUID()));
	}

	if (items.empty())
	{
		return;
	}

	const int cur_size = children_.size();
	model_->beginInsertRows(index(), cur_size, cur_size + items.size() - 1);
	std::copy(std::begin(items), std::end(items), std::back_inserter(children_));
	model_->endInsertRows();
}

bool MaterialsModel::Item::canFetchMore() const
{
	return children_.empty() && childCount();
}

////////////////////////////////////////////////////////////////////////////////
// MaterialsModel.
////////////////////////////////////////////////////////////////////////////////
MaterialsModel::MaterialsModel(QObject *parent)
	: QAbstractItemModel(parent)
	, root_(Item::createRootItem(this))
{
}

MaterialsModel::~MaterialsModel()
{
	delete root_;
}

QModelIndex MaterialsModel::index(int row, int column, const QModelIndex &parent) const
{
	if (column > 0)
	{
		return {};
	}

	Item *parent_item = nullptr;
	if (!parent.isValid())
	{
		parent_item = root_;
	}
	else
	{
		parent_item = static_cast<Item *>(parent.internalPointer());
	}

	Item *child_item = parent_item->child(row);
	return child_item
		? createIndex(row, column, child_item)
		: QModelIndex();
}

QModelIndex MaterialsModel::index(const UGUID &guid) const
{
	if (guid.isEmpty())
	{
		return QModelIndex();
	}
	Item *item = root_->find(guid);
	return item ? item->index() : QModelIndex();
}

QModelIndex MaterialsModel::parent(const QModelIndex &child) const
{
	if (!child.isValid())
	{
		return QModelIndex();
	}
	Item *child_item = static_cast<Item *>(child.internalPointer());
	Item *parent_item = child_item->parent();

	return (parent_item != root_)
		? createIndex(parent_item->row(), 0, parent_item)
		: QModelIndex();
}

int MaterialsModel::rowCount(const QModelIndex &parent) const
{
	if (parent.column() > 0)
	{
		return 0;
	}

	Item *parent_item = nullptr;
	if (!parent.isValid())
	{
		parent_item = root_;
	}
	else
	{
		parent_item = static_cast<Item *>(parent.internalPointer());
	}

	return parent_item->childCount();
}

int MaterialsModel::columnCount(const QModelIndex &parent) const
{
	return 1;
}

QVariant MaterialsModel::data(const QModelIndex &index, int role) const
{
	if (!index.isValid())
	{
		return QVariant();
	}

	Item *item = static_cast<Item *>(index.internalPointer());
	return item->data(role);
}

void MaterialsModel::fetchMore(const QModelIndex &parent)
{
	if (!parent.isValid())
	{
		return;
	}
	Item *item = static_cast<Item *>(parent.internalPointer());
	item->fetchMore();
}

bool MaterialsModel::canFetchMore(const QModelIndex &parent) const
{
	if (!parent.isValid())
	{
		return false;
	}
	Item *item = static_cast<Item *>(parent.internalPointer());
	return item->canFetchMore();
}

} // namespace Materials

View Class#

Header File#

MaterialsView.h

MaterialsView.h
#pragma once

#include <QWidget>
#include <QModelIndex>

#include <UnigineGUID.h>

class QAbstractItemModel;
class QItemSelection;
class QTreeView;

namespace Materials
{

class MaterialsView : public QWidget
{
	Q_OBJECT
	Q_DISABLE_COPY(MaterialsView)
public:
	explicit MaterialsView(QAbstractItemModel *model, QWidget *parent = nullptr);
	~MaterialsView() override;

signals:
	void selected(const QModelIndexList &indexes);

public slots:
	void clearSelection();
	void globalSelectionChanged(const QModelIndexList &indexes);

private slots:
	void selectionChanged(const QItemSelection &selection);

private:
	QTreeView *view_ = nullptr;
};

} // namespace Materials

Implementation File#

MaterialsView.cpp

MaterialsView.cpp
#include "MaterialsView.h"

#include <QAbstractItemModel>
#include <QVBoxLayout>
#include <QTreeView>

namespace Materials
{

MaterialsView::MaterialsView(QAbstractItemModel *model, QWidget *parent)
	: QWidget{parent}
{
	view_ = new QTreeView();
	view_->setAlternatingRowColors(true);
	view_->setSelectionMode(QAbstractItemView::ExtendedSelection);
	view_->setSelectionBehavior(QAbstractItemView::SelectRows);
	view_->setHeaderHidden(true);

	auto vl = new QVBoxLayout(this);
	vl->setContentsMargins(2, 2, 2, 2);
	vl->addWidget(view_);

	view_->setModel(model);

	connect(view_->selectionModel(), &QItemSelectionModel::selectionChanged
			, this, &MaterialsView::selectionChanged);
}

MaterialsView::~MaterialsView() = default;

void MaterialsView::clearSelection()
{
	view_->selectionModel()->clearSelection();
}

void MaterialsView::globalSelectionChanged(const QModelIndexList &indexes)
{
	if (indexes.empty())
	{
		clearSelection();
		return;
	}

	view_->setCurrentIndex(indexes.back());

	QItemSelection item_selection;
	for (const QModelIndex &index: indexes)
	{
		item_selection.append(QItemSelectionRange(index));
	}
	view_->selectionModel()->select(item_selection, QItemSelectionModel::ClearAndSelect);

	view_->scrollTo(indexes.back());
}

void MaterialsView::selectionChanged(const QItemSelection &selection)
{
	emit selected(view_->selectionModel()->selectedIndexes());
}

} // namespace Materials

Auxiliary File#

This file contains registration of additional metatypes to be used in our plugin. To make them known to Qt's meta-object system (to be able to put and get Unigine::UGUID to and out of the QVariant), we need Unigine::UGUID.

Notice
This file should be saved to the source folder with all other source files.

QtMetaTypes.h

QtMetaTypes.h
#pragma once

// including UnigineGUID.h containing definition of the metatype we're going to declare
#include <UnigineGUID.h>
// including QMetaType to be able to declare metatypes
#include <QMetaType>

// registering the Unigine::UGUID type to make it known to Qt's meta-object system
Q_DECLARE_METATYPE(Unigine::UGUID)

Building the Plugin#

Using MS Visual Studio#

In case you're using MS Visual Studio, there is a .vcxproj file in your plugin folder just select the Release configuration and choose Build Solution in the main menu. The project is pre-configured to launch with the UnigineEditor so you can run and test it right from your IDE (e.g. simply hit the default Ctrl + F5 hotkey in Visual Studio).

Notice
Release version of the Editor requires Release binaries of plugins and does not load Debug ones!

Using CMake#

All files required to build our plugin using CMake (CMakeList.txt and Materials.json describing our Materials plugin and its dependencies) are automatically added to the corressponding folder of your plugin inside your UNIGINE project's source folder. So, launch CMake to build the plugin.

Running the Plugin#

As the plugin is built, all resulting files are automatically copied to the %project_name%/bin/plugins/Unigine/ folder, so that UnigineEditor Plugin System could load it automatically.

And finally we launch UnigineEditor to check our plugin. If everything was done properly, you will see the MaterialsPlugin plugin in Editor Plugin Manager (Windows -> Editor Plugin Manager).

Plugins List

Notice
You can unload and load your plugin again when necessary via the corresponding button in the HotReload column.
Last update: 2023-11-08
Build: ()