#include <TGUI/Backend/Renderer/GLES2/CanvasGLES2.hpp>

Inheritance diagram for tgui::CanvasGLES2:

Public Types
typedef std::shared_ptr< CanvasGLES2 >	Ptr
	Shared widget pointer.

typedef std::shared_ptr< const CanvasGLES2 >	ConstPtr
	Shared constant widget pointer.

Public Types inherited from tgui::ClickableWidget
typedef std::shared_ptr< ClickableWidget >	Ptr
	Shared widget pointer.

typedef std::shared_ptr< const ClickableWidget >	ConstPtr
	Shared constant widget pointer.

Public Types inherited from tgui::Widget
typedef std::shared_ptr< Widget >	Ptr
	Shared widget pointer.

typedef std::shared_ptr< const Widget >	ConstPtr
	Shared constant widget pointer.

Public Member Functions
	CanvasGLES2 (const char *typeName="CanvasGLES2", bool initRenderer=true)

	CanvasGLES2 (const CanvasGLES2 &copy)
	Copy constructor.

	CanvasGLES2 (CanvasGLES2 &&copy)=default
	Default move constructor.

	~CanvasGLES2 ()
	Destructor.

CanvasGLES2 &	operator= (const CanvasGLES2 &right)
	Overload of copy assignment operator.

CanvasGLES2 &	operator= (CanvasGLES2 &&right)=default
	Default move assignment operator.

void	setSize (const Layout2d &size) override
	Changes the size of the widget. More...

void	draw (BackendRenderTarget &target, RenderStates states) const override
	Draw the widget to a render target. More...

bool	canGainFocus () const override
	Returns whether the widget can gain focus. More...

unsigned int	bindFramebuffer () const
	Binds the framebuffer of the canvas. More...

virtual void	setSize (const Layout2d &size)
	Changes the size of the widget. More...

void	setSize (Layout width, Layout height)
	Changes the size of the widget. More...

Public Member Functions inherited from tgui::ClickableWidget
	ClickableWidget (const char *typeName="ClickableWidget", bool initRenderer=true)

bool	isMouseOnWidget (Vector2f pos) const override
	Returns whether the mouse position (which is relative to the parent widget) lies on top of the widget. More...

void	leftMousePressed (Vector2f pos) override

void	leftMouseReleased (Vector2f pos) override

void	rightMousePressed (Vector2f pos) override

void	rightMouseReleased (Vector2f pos) override

void	rightMouseButtonNoLongerDown () override

void	draw (BackendRenderTarget &target, RenderStates states) const override
	Draw the widget to a render target. More...

Public Member Functions inherited from tgui::Widget
	Widget (const char *typeName, bool initRenderer)

	Widget (const Widget &)
	Copy constructor.

	Widget (Widget &&)
	Move constructor.

virtual	~Widget ()
	Destructor.

Widget &	operator= (const Widget &)
	Overload of copy assignment operator.

Widget &	operator= (Widget &&)
	Move assignment.

void	setRenderer (std::shared_ptr< RendererData > rendererData)
	Sets a new renderer for the widget. The renderer determines how the widget looks. More...

WidgetRenderer *	getSharedRenderer ()
	Returns the renderer, which gives access to functions that determine how the widget is displayed. More...

const WidgetRenderer *	getSharedRenderer () const

WidgetRenderer *	getRenderer ()
	Returns the renderer, which gives access to functions that determine how the widget is displayed. More...

const WidgetRenderer *	getRenderer () const

virtual void	setPosition (const Layout2d &position)
	sets the position of the widget More...

void	setPosition (Layout x, Layout y)
	Sets the position of the widget. More...

Vector2f	getPosition () const
	Gets the position of the widget. More...

virtual void	setSize (const Layout2d &size)
	Changes the size of the widget. More...

void	setSize (Layout width, Layout height)
	Changes the size of the widget. More...

void	setWidth (Layout width)
	Changes the width of the widget. More...

void	setHeight (Layout height)
	Changes the height of the widget. More...

Vector2f	getSize () const
	Returns the size of the widget. More...

virtual Vector2f	getFullSize () const
	Returns the entire size that the widget is using. More...

virtual Vector2f	getAbsolutePosition () const
	Get the absolute position of the top-left point of the widget instead of the relative position to its parent. More...

virtual Vector2f	getWidgetOffset () const
	Returns the distance between the position where the widget is drawn and where the widget is placed. More...

void	setOrigin (float x, float y)
	Sets the origin point on which the position, scale and rotation is based. More...

void	setOrigin (Vector2f origin)
	Sets the origin point on which the position, scale and rotation is based. More...

Vector2f	getOrigin () const
	Returns the relative origin point on which the position, scale and rotation is based. More...

void	setScale (Vector2f scaleFactors)
	Sets the scaling to be applied to the widget. More...

void	setScale (Vector2f scaleFactors, Vector2f origin)
	Sets the scaling to be applied to the widget. More...

void	setScale (float scaleFactor)
	Sets the scaling to be applied to the widget. More...

void	setScale (float scaleFactor, Vector2f origin)
	Sets the scaling to be applied to the widget. More...

Vector2f	getScale () const
	Returns the scaling to be applied to the widget. More...

Vector2f	getScaleOrigin () const
	Returns the origin used for scaling. More...

void	setRotation (float angle)
	Sets the rotation to be applied to the widget. More...

void	setRotation (float angle, Vector2f origin)
	Sets the rotation to be applied to the widget. More...

float	getRotation () const
	Returns the rotation to be applied to the widget. More...

Vector2f	getRotationOrigin () const
	Returns the origin used for rotations. More...

void	showWithEffect (ShowEffectType type, Duration duration)
	Shows the widget by introducing it with an animation. More...

void	hideWithEffect (ShowEffectType type, Duration duration)
	Hides the widget by making it leave with an animation. More...

void	moveWithAnimation (Layout2d position, Duration duration)
	Moves the widget from its current position to the given position, over a given duration. More...

void	resizeWithAnimation (Layout2d size, Duration duration)
	Resizes the widget from its current size to the given size, over a given duration. More...

virtual void	setVisible (bool visible)
	Shows or hides a widget. More...

bool	isVisible () const
	Returns true when the widget is visible. More...

virtual void	setEnabled (bool enabled)
	Enables or disables the widget. More...

bool	isEnabled () const
	Returns true when the widget is enabled. More...

virtual void	setFocused (bool focused)
	Focus or unfocus the widget. More...

bool	isFocused () const
	Returns true when the widget is focused and false otherwise. More...

const String &	getWidgetType () const
	Returns the type of the widget. More...

Container *	getParent () const
	Returns a pointer to the parent widget. More...

BackendGui *	getParentGui () const
	Returns a pointer to the gui to which this widget belongs. More...

bool	isAnimationPlaying () const
	Returns whether there is an active animation (started with showWithEffect or hideWithEffect) More...

void	moveToFront ()
	Places the widget before all other widgets. More...

void	moveToBack ()
	Places the widget behind all other widgets. More...

void	setUserData (Any userData)
	Stores some data into the widget. More...

template<typename T >
T	getUserData () const
	Returns data stored in the widget. More...

void	setInheritedFont (const Font &font)
	Sets the font of the widget that is used when no font is set in the renderer. More...

const Font &	getInheritedFont () const
	Returns the font of the widget that is used when no font is set in the renderer. More...

void	setInheritedOpacity (float opacity)
	Sets the opacity of the widget that will be multiplied with the opacity set in the renderer. More...

float	getInheritedOpacity () const
	Returns the opacity of the widget that is multiplied with the opacity set in the renderer. More...

void	setTextSize (unsigned int size)
	Changes the character size of text in this widget if it uses text. More...

unsigned int	getTextSize () const
	Returns the character size of text in this widget. More...

void	setToolTip (Widget::Ptr toolTip)
	Sets the tool tip that should be displayed when hovering over the widget. More...

Widget::Ptr	getToolTip () const
	Returns the tool tip that is displayed when hovering over the widget. More...

void	setWidgetName (const String &name)
	Changes the name of a widget. More...

String	getWidgetName () const
	Returns the name of a widget. More...

void	setMouseCursor (Cursor::Type cursor)
	Changes which mouse cursor is shown when hovering over the widget. More...

Cursor::Type	getMouseCursor () const
	Returns which mouse cursor is shown when hovering over the widget. More...

void	setFocusable (bool focusable)
	Changes whether a widget could be focused. More...

bool	isFocusable () const
	Returns whether a widget could be focused. More...

void	finishAllAnimations ()
	Makes all animations of the widget finish immediately.

virtual bool	canGainFocus () const
	Returns whether the widget can currently gain focus. More...

bool	isContainer () const
	Returns whether the widget is a container widget or not. More...

bool	isDraggableWidget () const
	Returns whether the widget has something to drag (e.g. slider or scrollbar thumbs) More...

bool	isMouseDown () const
	Returns whether the left mouse button has been pressed on top of the widget. More...

virtual Signal &	getSignal (String signalName)
	Retrieves a signal based on its name. More...

virtual void	setParent (Container *parent)

virtual bool	updateTime (Duration elapsedTime)

virtual bool	isMouseOnWidget (Vector2f pos) const =0
	Returns whether the mouse position (which is relative to the parent widget) lies on top of the widget. More...

virtual void	leftMousePressed (Vector2f pos)

virtual void	leftMouseReleased (Vector2f pos)

virtual void	rightMousePressed (Vector2f pos)

virtual void	rightMouseReleased (Vector2f pos)

virtual void	mousePressed (Event::MouseButton button, Vector2f pos)

virtual void	mouseReleased (Event::MouseButton button, Vector2f pos)

virtual void	mouseMoved (Vector2f pos)

virtual void	keyPressed (const Event::KeyEvent &event)

virtual void	textEntered (char32_t key)

virtual bool	mouseWheelScrolled (float delta, Vector2f pos)

virtual void	mouseNoLongerOnWidget ()

virtual void	leftMouseButtonNoLongerDown ()

virtual void	rightMouseButtonNoLongerDown ()

virtual Widget::Ptr	askToolTip (Vector2f mousePos)

const Layout2d &	getPositionLayout () const

const Layout2d &	getSizeLayout () const

void	bindPositionLayout (Layout *layout)

void	unbindPositionLayout (Layout *layout)

void	bindSizeLayout (Layout *layout)

void	unbindSizeLayout (Layout *layout)

virtual void	draw (BackendRenderTarget &target, RenderStates states) const =0
	Draw the widget to a render target. More...

template<typename WidgetType >
std::shared_ptr< const WidgetType >	cast () const
	Downcast const widget.

template<typename WidgetType >
std::shared_ptr< WidgetType >	cast ()
	Downcast widget.

virtual Widget::Ptr	clone () const =0
	Makes a copy of the widget if you don't know its exact type. More...

Static Public Member Functions
static CanvasGLES2::Ptr	create (Layout2d size={"100%", "100%"})
	Creates a new canvas widget. More...

static CanvasGLES2::Ptr	copy (CanvasGLES2::ConstPtr canvas)
	Makes a copy of another canvas. More...

Static Public Member Functions inherited from tgui::ClickableWidget
static ClickableWidget::Ptr	create (Layout2d size={"100%", "100%"})
	Creates a new clickable widget. More...

static ClickableWidget::Ptr	copy (ClickableWidget::ConstPtr widget)
	Makes a copy of another clickable widget. More...

Protected Member Functions
Widget::Ptr	clone () const override
	Makes a copy of the widget if you don't know its exact type. More...

Protected Member Functions inherited from tgui::ClickableWidget
Signal &	getSignal (String signalName) override
	Retrieves a signal based on its name. More...

Widget::Ptr	clone () const override
	Makes a copy of the widget if you don't know its exact type. More...

Protected Member Functions inherited from tgui::Widget
virtual void	rendererChanged (const String &property)
	Function called when one of the properties of the renderer is changed. More...

virtual std::unique_ptr< DataIO::Node >	save (SavingRenderersMap &renderers) const
	Saves the widget as a tree node in order to save it to a file. More...

virtual void	load (const std::unique_ptr< DataIO::Node > &node, const LoadingRenderersMap &renderers)
	Loads the widget from a tree of nodes. More...

virtual void	updateTextSize ()
	Called when the text size is changed (either by setTextSize or via the renderer) More...

virtual void	mouseEnteredWidget ()
	This function is called when the mouse enters the widget. More...

virtual void	mouseLeftWidget ()
	This function is called when the mouse leaves the widget. More...

Protected Attributes
unsigned int	m_textureId = 0

unsigned int	m_frameBuffer = 0

Vector2u	m_textureSize

Vector2u	m_usedTextureSize

std::shared_ptr< BackendTextureGLES2 >	m_backendTexture

Protected Attributes inherited from tgui::Widget
String	m_type

String	m_name

Layout2d	m_position

Layout2d	m_size

unsigned int	m_textSize = 0

Vector2f	m_origin

Optional< Vector2f >	m_rotationOrigin

Optional< Vector2f >	m_scaleOrigin

Vector2f	m_scaleFactors = {1, 1}

float	m_rotationDeg = 0

Vector2f	m_prevPosition

Vector2f	m_prevSize

std::unordered_set< Layout * >	m_boundPositionLayouts

std::unordered_set< Layout * >	m_boundSizeLayouts

bool	m_enabled = true

bool	m_visible = true

Container *	m_parent = nullptr

BackendGui *	m_parentGui = nullptr

bool	m_mouseHover = false

bool	m_mouseDown = false

bool	m_focused = false

bool	m_focusable = true

Duration	m_animationTimeElapsed

bool	m_draggableWidget = false

bool	m_containerWidget = false

Widget::Ptr	m_toolTip = nullptr

aurora::CopiedPtr< WidgetRenderer >	m_renderer = nullptr

std::vector< std::shared_ptr< priv::Animation > >	m_showAnimations

Font	m_inheritedFont

float	m_inheritedOpacity = 1

Font	m_fontCached = Font::getGlobalFont()

float	m_opacityCached = 1

bool	m_transparentTextureCached = false

unsigned int	m_textSizeCached = 0

Any	m_userData

Cursor::Type	m_mouseCursor = Cursor::Type::Arrow

std::function< void(const String &property)>	m_rendererChangedCallback = [this](const String& property){ rendererChangedCallback(property); }

Additional Inherited Members
Public Attributes inherited from tgui::ClickableWidget
SignalVector2f	onMousePress = {"MousePressed"}
	The mouse went down on the widget. Optional parameter: mouse position relative to widget.

SignalVector2f	onMouseRelease = {"MouseReleased"}
	The mouse was released on top of the widget. Optional parameter: mouse position relative to widget.

SignalVector2f	onClick = {"Clicked"}
	The widget was clicked. Optional parameter: mouse position relative to widget.

SignalVector2f	onRightMousePress = {"RightMousePressed"}
	The right mouse button went down on the widget. Optional parameter: mouse position relative to widget.

SignalVector2f	onRightMouseRelease = {"RightMouseReleased"}
	The right mouse button was released on top of the widget. Optional parameter: mouse position relative to widget.

SignalVector2f	onRightClick = {"RightClicked"}
	The widget was right clicked. Optional parameter: mouse position relative to widget.

Public Attributes inherited from tgui::Widget
SignalVector2f	onPositionChange = {"PositionChanged"}
	The position of the widget changed. Optional parameter: new position.

SignalVector2f	onSizeChange = {"SizeChanged"}
	The size of the widget changed. Optional parameter: new size.

Signal	onFocus = {"Focused"}
	The widget was focused.

Signal	onUnfocus = {"Unfocused"}
	The widget was unfocused.

Signal	onMouseEnter = {"MouseEntered"}
	The mouse entered the widget.

Signal	onMouseLeave = {"MouseLeft"}
	The mouse left the widget.

SignalShowEffect	onShowEffectFinish = {"ShowEffectFinished"}
	A show or hide effect finished. Optional parameters: effect type, new widget visibility or both.

SignalAnimationType	onAnimationFinish = {"AnimationFinished"}
	An animation has finished. More...

Protected Types inherited from tgui::Widget
using	SavingRenderersMap = std::map< const Widget *, std::pair< std::unique_ptr< DataIO::Node >, String > >

using	LoadingRenderersMap = std::map< String, std::shared_ptr< RendererData > >

Detailed Description

CanvasGLES2 provides a way to directly render OpenGL ES contents on a widget

When gui.draw() is called, all widgets are drawn at once. If you wish to have custom OpenGL ES rendering inbetween TGUI widgets (e.g. draw to the background of a child window) then you need to use a CanvasGLES2 widget.

The canvas widget is essentially just a wrapper around a framebuffer and its texture. You draw your OpenGL ES contents on top of the canvas instead of on the window. The canvas is then added to the gui between the widgets where you want the rendering to appear.

You can redraw the contents of the canvas at any time, but make sure to always start by calling bindFramebuffer and end the rendering by calling glBindFramebuffer again.

Example:

auto canvas = tgui::CanvasGLES2::create({400, 300});
gui.add(canvas);
 
canvas->bindFramebuffer(); // Let drawing happen on the canvas instead of the window
glClear(GL_COLOR_BUFFER_BIT); // Clear the contents of the canvas (with color set with glClearColor)
// Draw whatever you want to draw on the canvas here
glBindFramebuffer(GL_FRAMEBUFFER, 0); // Let further drawing happen on the window again

Member Function Documentation

◆ bindFramebuffer()

unsigned int tgui::CanvasGLES2::bindFramebuffer ( ) const

Binds the framebuffer of the canvas.

Returns: id of internal framebuffer that was just bound by this function

This will call glBindFramebuffer and glFramebufferTexture2D on the internal texture.

◆ canGainFocus()

bool tgui::CanvasGLES2::canGainFocus ( ) const

overridevirtual

Returns whether the widget can gain focus.

Returns: Can the widget be focused?

This function returns false for Canvas widgets.

Reimplemented from tgui::Widget.

◆ clone()

Widget::Ptr tgui::CanvasGLES2::clone ( ) const

overrideprotectedvirtual

Makes a copy of the widget if you don't know its exact type.

This function should only be used when you don't know the type of the widget. If you know what kind of widget you are copying, you should use the copy function.

Returns: Copy of the widget

Reimplemented from tgui::ClickableWidget.

◆ copy()

static CanvasGLES2::Ptr tgui::CanvasGLES2::copy ( CanvasGLES2::ConstPtr canvas )

static

Makes a copy of another canvas.

Parameters

canvas The other canvas

Returns: The new canvas

◆ create()

static CanvasGLES2::Ptr tgui::CanvasGLES2::create ( Layout2d size = {"100%", "100%"} )

static

Creates a new canvas widget.

Parameters

size	Size of the canvas

Returns: The new canvas

◆ draw()

void tgui::CanvasGLES2::draw	(	BackendRenderTarget &	target,
		RenderStates	states
	)		const

overridevirtual

Draw the widget to a render target.

Parameters

target	Render target to draw to
states	Current render states

Reimplemented from tgui::ClickableWidget.

◆ setSize() [1/3]

virtual void tgui::Widget::setSize ( const Layout2d & size )

virtual

Changes the size of the widget.

Parameters

size	Size of the widget

Usage examples:

// Give the widget an exact size
widget->setSize({40, 30});
 
// Give the widget a size relative to the size of its parent
widget->setSize({"20%", "5%"});
 
// Make the widget 50 pixels higher than some other widget and automatically resize it when the other widget resizes
widget->setSize({200, tgui::bindHeight(otherWidget) + 50});

Reimplemented from tgui::Widget.

◆ setSize() [2/3]

void tgui::CanvasGLES2::setSize ( const Layout2d & size )

overridevirtual

Changes the size of the widget.

Parameters

size	The new size of the widget

Reimplemented from tgui::Widget.

◆ setSize() [3/3]

void tgui::Widget::setSize	(	Layout	width,
		Layout	height
	)

inline

Changes the size of the widget.

Parameters

width	Width of the widget
height	Height of the widget

Warning: This setSize overload must never be used from internal TGUI code or by custom widget implementations

The documentation for this class was generated from the following file:

include/TGUI/Backend/Renderer/GLES2/CanvasGLES2.hpp

TGUI

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ bindFramebuffer()

◆ canGainFocus()

◆ clone()

◆ copy()

◆ create()

◆ draw()

◆ setSize() [1/3]

◆ setSize() [2/3]

◆ setSize() [3/3]