#include <LScene.h>

The LScene class is an optional utility that significantly simplifies rendering. More...

Detailed Description

The LScene class is an optional utility that significantly simplifies rendering.

It encompasses a primary LSceneView which can host multiple children and even nested scenes. A single LScene can drive multiple outputs and also manage pointer and keyboard Wayland events, while also providing per-view input events. You might opt to leverage LScene for rendering instead of relying solely on the basic rendering functions from the LPainter class or your custom OpenGL shaders.

LScene achieves high efficiency by rendering only damaged regions and avoiding rendering content obscured by opaque areas.

Alternatively, you can still use your own OpenGL shaders or LPainter functions for rendering, either in conjunction with LScene or independently. These approaches can be applied before or after handlePaintGL() is invoked, or by creating your custom LView that overrides the LView::paintRect() virtual method.

Rendering

For proper rendering with LScene, you need to "plug" the following methods into each LOutput you intend to manage with LScene:

Warning: Make sure to "plug" the scene to all the output events mentioned earlier. Failing to do so may result in scene initialization issues, memory leaks, and potential compositor crashes.

For example, like this:

#include <LOutput.h>
 
class YourCustomOutput : public LOutput
{
    LScene *scene;
 
    ...
 
    void initializeGL(LOutput *output) override
    {
        scene->handleInitializeGL(output);
    }
 
    void paintGL(LOutput *output) override
    {
        scene->handlePaintGL(output);
    }
 
    void moveGL(LOutput *output) override
    {
        scene->handleMoveGL(output);
    }
 
    void resizeGL(LOutput *output) override
    {
        scene->handleResizeGL(output);
    }
 
    void uninitializeGL(LOutput *output) override
    {
        scene->handleUninitializeGL(output);
    }
};

Pointer Events

Similar to rendering, you can integrate the handlePointerXXX methods into the LPointer class.
This enables LScene to dispatch pointer events to each LView, invoking methods such as LView::pointerEnterEvent(), LView::pointerMoveEvent(), and more. Additionally, the scene can manage pointer focus for LSurfaces and transmit pointer events accordingly to clients. You also have the option to disable this behavior if you prefer to handle this logic independently. To deactivate the handling of Wayland events, use the enableHandleWaylandPointerEvents() method.

Keyboard Events

Similar to rendering, you can integrate the handleKeyXXX methods into the LKeyboard class.
This empowers LScene to dispatch keyboard events to each LView, triggering methods like LView::keyEvent(), LView::keyModifiersEvent(), and more. Furthermore, the scene can manage keyboard focus for LSurfaces and transmit keyboard events correspondingly to clients. If desired, you can also opt to disable this behavior and manage the logic independently. To deactivate the handling of Wayland events, utilize the enableHandleWaylandKeyboardEvents() method.

Public Member Functions
	LScene ()
	Default constructor for LScene. More...

	~LScene ()
	Destructor for LScene. More...

void	handleInitializeGL (LOutput *output)
	Handle the OpenGL initialization for an LOutput. More...

void	handlePaintGL (LOutput *output)
	Handle the OpenGL painting for an LOutput. More...

void	handleMoveGL (LOutput *output)
	Handle the OpenGL movement for an LOutput. More...

void	handleResizeGL (LOutput *output)
	Handle the OpenGL resizing for an LOutput. More...

void	handleUninitializeGL (LOutput *output)
	Handle the OpenGL uninitialization for an LOutput. More...

LView *	handlePointerMoveEvent (Float32 x, Float32 y, bool absolute, LPoint *localPos=nullptr)
	Handle pointer movement event. More...

void	handlePointerButtonEvent (LPointer::Button button, LPointer::ButtonState state)
	Handle pointer button event. More...

void	handlePointerAxisEvent (Float64 axisX, Float64 axisY, Int32 discreteX, Int32 discreteY, LPointer::AxisSource source)
	Handle pointer axis event. More...

bool	handleWaylandPointerEventsEnabled () const
	Check if handling of Wayland pointer events is enabled. More...

void	enableHandleWaylandPointerEvents (bool enabled)
	Enable or disable handling of Wayland pointer events. More...

void	handleKeyModifiersEvent (UInt32 depressed, UInt32 latched, UInt32 locked, UInt32 group)
	Handle key modifiers event. More...

void	handleKeyEvent (UInt32 keyCode, LKeyboard::KeyState keyState)
	Handle key event. More...

bool	handleWaylandKeyboardEventsEnabled () const
	Check if handling of Wayland keyboard events is enabled. More...

void	enableHandleWaylandKeyboardEvents (bool enabled)
	Enable or disable handling of Wayland keyboard events. More...

bool	auxKeyboardImplementationEnabled () const
	Check if auxiliary keyboard implementation is enabled. More...

void	enableAuxKeyboardImplementation (bool enabled)
	Enable or disable auxiliary keyboard implementation. More...

LSceneView *	mainView () const
	Retrieve the main view of the scene. More...

LView *	viewAt (const LPoint &pos)
	Retrieve the view located at the specified position. More...

Public Member Functions inherited from LObject
	LObject ()
	Constructor of the LObject class. More...

Additional Inherited Members
Static Public Member Functions inherited from LObject
static LCompositor *	compositor ()
	Quick access to the global compositor instance. More...

static LSeat *	seat ()
	Quick access to the global seat instance. More...

static LCursor *	cursor ()
	Quick access to the global cursor instance. More...

Constructor & Destructor Documentation

◆ LScene()

LScene ( )

Default constructor for LScene.

◆ ~LScene()

~LScene ( )

Destructor for LScene.

Member Function Documentation

◆ handleInitializeGL()

void handleInitializeGL ( LOutput * output )

Handle the OpenGL initialization for an LOutput.

This method should be integrated into LOutput::initializeGL() to properly handle OpenGL initialization for the associated output.

Parameters

output The LOutput instance to handle OpenGL initialization for.

◆ handlePaintGL()

void handlePaintGL ( LOutput * output )

Handle the OpenGL painting for an LOutput.

This method should be integrated into LOutput::paintGL() to properly handle OpenGL painting for the associated output.

Parameters

output The LOutput instance to handle OpenGL painting for.

◆ handleMoveGL()

void handleMoveGL ( LOutput * output )

Handle the OpenGL movement for an LOutput.

This method should be integrated into LOutput::moveGL() to properly handle OpenGL movement for the associated output.

Parameters

output The LOutput instance to handle OpenGL movement for.

◆ handleResizeGL()

void handleResizeGL ( LOutput * output )

Handle the OpenGL resizing for an LOutput.

This method should be integrated into LOutput::resizeGL() to properly handle OpenGL resizing for the associated output.

Parameters

output The LOutput instance to handle OpenGL resizing for.

◆ handleUninitializeGL()

void handleUninitializeGL ( LOutput * output )

Handle the OpenGL uninitialization for an LOutput.

This method should be integrated into LOutput::uninitializeGL() to properly handle OpenGL uninitialization for the associated output.

Parameters

output The LOutput instance to handle OpenGL uninitialization for.

◆ handlePointerMoveEvent()

LView * handlePointerMoveEvent	(	Float32	x,
		Float32	y,
		bool	absolute,
		LPoint *	localPos = `nullptr`
	)

Handle pointer movement event.

This method should be integrated into LPointer::pointerMoveEvent() to effectively manage pointer movement events.

Parameters

x	The x-component of the new pointer position or delta from its previous position.
y	The y-component of the new pointer position or delta from its previous position.
absolute	If `true`, the (x, y) values represent absolute coordinates; if `false`, they are deltas from the previous position.
localPos	Local pos of the first view found under the cursor.

Returns: The first LView found under the cursor.

◆ handlePointerButtonEvent()

void handlePointerButtonEvent	(	LPointer::Button	button,
		LPointer::ButtonState	state
	)

Handle pointer button event.

This method should be integrated into LPointer::pointerButtonEvent() to handle pointer button events.

Parameters

button	The button involved in the event.
state	The state of the button (pressed or released).

◆ handlePointerAxisEvent()

void handlePointerAxisEvent	(	Float64	axisX,
		Float64	axisY,
		Int32	discreteX,
		Int32	discreteY,
		LPointer::AxisSource	source
	)

Handle pointer axis event.

This method should be integrated into LPointer::pointerAxisEvent() to manage pointer axis events.

Parameters

axisX	The x-axis value of the event.
axisY	The y-axis value of the event.
discreteX	The discrete value on the x-axis.
discreteY	The discrete value on the y-axis.
source	The source of the event.

◆ handleWaylandPointerEventsEnabled()

bool handleWaylandPointerEventsEnabled ( ) const

Check if handling of Wayland pointer events is enabled.

This method allows you to check whether the handling of Wayland pointer events is currently enabled.

Returns: True if Wayland pointer events handling is enabled, false otherwise.

◆ enableHandleWaylandPointerEvents()

void enableHandleWaylandPointerEvents ( bool enabled )

Enable or disable handling of Wayland pointer events.

This method enables or disables the handling of Wayland pointer events by LScene.

Parameters

enabled True to enable handling of Wayland pointer events, false to disable.

◆ handleKeyModifiersEvent()

void handleKeyModifiersEvent	(	UInt32	depressed,
		UInt32	latched,
		UInt32	locked,
		UInt32	group
	)

Handle key modifiers event.

This method should be integrated into LKeyboard::keyModifiersEvent() to manage key modifiers events.

Parameters

depressed	The bitfield representing depressed modifiers.
latched	The bitfield representing latched modifiers.
locked	The bitfield representing locked modifiers.
group	The keyboard group.

◆ handleKeyEvent()

void handleKeyEvent	(	UInt32	keyCode,
		LKeyboard::KeyState	keyState
	)

Handle key event.

This method should be integrated into LKeyboard::keyEvent() to handle key events.

Parameters

keyCode	The code of the key involved in the event.
keyState	The state of the key (pressed or released).

◆ handleWaylandKeyboardEventsEnabled()

bool handleWaylandKeyboardEventsEnabled ( ) const

Check if handling of Wayland keyboard events is enabled.

This method allows you to check whether the handling of Wayland keyboard events is currently enabled.

Returns: True if Wayland keyboard events handling is enabled, false otherwise.

◆ enableHandleWaylandKeyboardEvents()

void enableHandleWaylandKeyboardEvents ( bool enabled )

Enable or disable handling of Wayland keyboard events.

This method enables or disables the handling of Wayland keyboard events by LScene.

Parameters

enabled True to enable handling of Wayland keyboard events, false to disable.

◆ auxKeyboardImplementationEnabled()

bool auxKeyboardImplementationEnabled ( ) const

Check if auxiliary keyboard implementation is enabled.

This method allows you to check whether auxiliary keyboard functions, such as closing the compositor with Ctrl + Alt + Esc, executing weston-terminal with F1, or modifying the drag-and-drop action with Shift, Alt, or Ctrl keys, are currently enabled.

Returns: True if auxiliary keyboard implementation is enabled, false otherwise.

◆ enableAuxKeyboardImplementation()

void enableAuxKeyboardImplementation ( bool enabled )

Enable or disable auxiliary keyboard implementation.

This method enables or disables auxiliary keyboard functions, such as custom key actions.

Parameters

enabled True to enable auxiliary keyboard implementation, false to disable.

◆ mainView()

LSceneView * mainView ( ) const

Retrieve the main view of the scene.

This method returns the main LSceneView associated with the LScene.

Returns: A pointer to the main LSceneView of the scene.

◆ viewAt()

LView * viewAt ( const LPoint & pos )

Retrieve the view located at the specified position.

This method returns the LView instance that occupies the given position within the scene.

Parameters

pos	The position to query.

Returns: A pointer to the LView at the specified position, or nullptr if no view is found.

Detailed Description

Rendering

Pointer Events

Keyboard Events

Public Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ LScene()

◆ ~LScene()

Member Function Documentation

◆ handleInitializeGL()

◆ handlePaintGL()

◆ handleMoveGL()

◆ handleResizeGL()

◆ handleUninitializeGL()

◆ handlePointerMoveEvent()

◆ handlePointerButtonEvent()

◆ handlePointerAxisEvent()

◆ handleWaylandPointerEventsEnabled()

◆ enableHandleWaylandPointerEvents()

◆ handleKeyModifiersEvent()

◆ handleKeyEvent()

◆ handleWaylandKeyboardEventsEnabled()

◆ enableHandleWaylandKeyboardEvents()

◆ auxKeyboardImplementationEnabled()

◆ enableAuxKeyboardImplementation()

◆ mainView()

◆ viewAt()