Container

A Container is a Drawable that can have child nodes. The z-order of children is determined by the order in which Drawables are added to the container - the Drawable added last will be front-most on the screen.

This class overrides a few functions in Drawable in order to traverse child nodes.

Note that containers act as view ports - that is, only the parts of children that intersect with the geometry of the container will be visible (e.g. setting a container's width to 0 will render all children invisible).

See: Drawable

Inherits from: Drawable

Inherited by: MoveAnimator< touchgfx::Container >, AbstractButtonContainer, AbstractClock, AbstractDataGraph, AbstractProgressIndicator, CacheableContainer, DrawableList, Keyboard, ListLayout, ModalWindow, ScrollableContainer, ScrollBase, SlideMenu, Slider, SwipeContainer, ZoomAnimationImage

Public Functions

virtual void	add(Drawable & d)
	Adds a Drawable instance as child to this Container.
	Container()
virtual bool	contains(const Drawable & d)
	Query if a given Drawable has been added directly to this Container.
virtual void	draw(const Rect & invalidatedArea) const
	Draw this drawable.
virtual void	forEachChild(GenericCallback< Drawable & > * function)
	Executes the specified callback function for each child in the Container.
virtual Drawable *	getFirstChild()
	Obtain a pointer to the first child of this container.
virtual void	getLastChild(int16_t x, int16_t y, Drawable ** last)
	Gets the last child in the list of children in this Container.
virtual Rect	getSolidRect() const
	Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
virtual void	insert(Drawable * previous, Drawable & d)
	Inserts a Drawable after a specific child node.
virtual void	remove(Drawable & d)
	Removes a Drawable from the container by removing it from the linked list of children.
virtual void	removeAll()
	Removes all children in the Container by resetting their parent and sibling pointers.
virtual void	unlink()
	Removes all children by unlinking the first child.

Protected Functions

virtual Rect	getContainedArea() const
	Gets a rectangle describing the total area covered by the children of this container.
virtual void	moveChildrenRelative(int16_t deltaX, int16_t deltaY)
	Calls moveRelative on all children.

Protected Attributes

Drawable *	firstChild
	Pointer to the first child of this container. Subsequent children can be found through firstChild's nextSibling.

Additional inherited members

Public Functions inherited from Drawable

virtual void	childGeometryChanged()
	This function can be called on parent nodes to signal that the size or position of one or more of its children has changed.
	Drawable()
	Initializes a new instance of the Drawable class.
void	drawToDynamicBitmap(BitmapId id)
	Render the Drawable object into a dynamic bitmap.
Rect	getAbsoluteRect() const
	Helper function for obtaining the rectangle this Drawable covers, expressed in absolute coordinates.
int16_t	getHeight() const
	Gets the height of this Drawable.
Drawable *	getNextSibling()
	Gets the next sibling node.
Drawable *	getParent() const
	Returns the parent node.
const Rect &	getRect() const
	Gets the rectangle this Drawable covers, in coordinates relative to its parent.
virtual Rect	getSolidRectAbsolute()
	Helper function for obtaining the largest solid rect (as implemented by getSolidRect()) expressed in absolute coordinates.
virtual void	getVisibleRect(Rect & rect) const
	Function for finding the visible part of this drawable.
int16_t	getWidth() const
	Gets the width of this Drawable.
int16_t	getX() const
	Gets the x coordinate of this Drawable, relative to its parent.
int16_t	getY() const
	Gets the y coordinate of this Drawable, relative to its parent.
virtual void	handleClickEvent(const ClickEvent & event)
	Defines the event handler interface for ClickEvents.
virtual void	handleDragEvent(const DragEvent & event)
	Defines the event handler interface for DragEvents.
virtual void	handleGestureEvent(const GestureEvent & event)
	Defines the event handler interface for GestureEvents.
virtual void	handleTickEvent()
	Called periodically by the framework if the Drawable instance has subscribed to timer ticks.
virtual void	invalidate() const
	Tell the framework that this entire Drawable needs to be redrawn.
virtual void	invalidateRect(Rect & invalidatedArea) const
	Request that a region of this drawable is redrawn.
bool	isTouchable() const
	Gets whether this Drawable receives touch events or not.
bool	isVisible() const
	Gets whether this Drawable is visible.
virtual void	moveRelative(int16_t x, int16_t y)
	Moves the drawable.
virtual void	moveTo(int16_t x, int16_t y)
	Moves the drawable.
virtual void	setHeight(int16_t height)
	Sets the height of this drawable.
void	setPosition(const Drawable & drawable)
	Sets the position of the Drawable to the same as the given Drawable.
void	setPosition(int16_t x, int16_t y, int16_t width, int16_t height)
	Sets the size and position of this Drawable, relative to its parent.
void	setTouchable(bool touch)
	Controls whether this Drawable receives touch events or not.
void	setVisible(bool vis)
	Controls whether this Drawable should be visible.
virtual void	setWidth(int16_t width)
	Sets the width of this drawable.
void	setWidthHeight(const Bitmap & bitmap)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(const Drawable & drawable)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(const Rect & rect)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(int16_t width, int16_t height)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
virtual void	setX(int16_t x)
	Sets the x coordinate of this Drawable, relative to its parent.
void	setXY(const Drawable & drawable)
	Sets the x and y coordinates of this Drawable.
void	setXY(int16_t x, int16_t y)
	Sets the x and y coordinates of this Drawable, relative to its parent.
virtual void	setY(int16_t y)
	Sets the y coordinate of this Drawable, relative to its parent.
virtual void	translateRectToAbsolute(Rect & r) const
	Helper function for converting a region of this Drawable to absolute coordinates.
virtual	~Drawable()
	Finalizes an instance of the Drawable class.

Protected Attributes inherited from Drawable

Drawable *	nextSibling
	Pointer to the next Drawable.
Drawable *	parent
	Pointer to this drawable's parent.
Rect	rect
	The coordinates of this Drawable, relative to its parent.
bool	touchable
	True if this drawable should receive touch events.
bool	visible
	True if this drawable should be drawn.

Public Functions Documentation

add

virtual void add	(	Drawable &	d	)

Adds a Drawable instance as child to this Container.

The Drawable added will be placed as the element to be drawn last, and thus appear on top of all previously added drawables in the Container.

Parameters:

d	The Drawable to add.

Note

Never add a drawable more than once!

Reimplemented by: touchgfx::ListLayout::add, touchgfx::ModalWindow::add, touchgfx::ScrollableContainer::add, touchgfx::SlideMenu::add, touchgfx::SwipeContainer::add

Container

Container	(			)

contains

virtual bool contains	(	const Drawable &	d	)

Query if a given Drawable has been added directly to this Container.

The search is not done recursively.

Parameters:

d	The Drawable to look for.

Returns:

True if the specified Drawable instance is direct child of this container, false otherwise.

draw

virtual void draw	(	const Rect &	invalidatedArea	)

Draw this drawable.

It is a requirement that the draw implementation does not draw outside the region specified by invalidatedArea.

Parameters:

invalidatedArea	The sub-region of this drawable that needs to be redrawn, expressed in coordinates relative to its parent (e.g. for a complete redraw, invalidatedArea will be (0, 0, width, height).

Reimplements: touchgfx::Drawable::draw

Reimplemented by: touchgfx::Keyboard::draw

forEachChild

virtual void forEachChild	(	GenericCallback< Drawable & > *	function	)

Executes the specified callback function for each child in the Container.

The callback to execute must have the following prototype: void T::func(Drawable&)

Parameters:

function	The function to be executed for each child.

getFirstChild

virtual Drawable * getFirstChild	(			)

Obtain a pointer to the first child of this container.

The first child is the Drawable drawn first, and therefore the Drawablebehind all other children of this Container. Useful if you want to manually iterate the children added to this container.

Returns:

Pointer to the first drawable added to this container. If nothing has been added return zero.

See also:

getNextSibling

Reimplements: touchgfx::Drawable::getFirstChild

getLastChild

virtual void getLastChild	(	int16_t	x ,
		int16_t	y ,
		Drawable **	last
		)

Gets the last child in the list of children in this Container.

If this Container is touchable (isTouchable()), it will be passed back as the result. Otherwise all visible children are traversed recursively to find the Drawable that intersects with the given coordinate.

Parameters:

x	The x coordinate of the intersection.
y	The y coordinate of the intersection.
last	out parameter in which the result is placed.

See also:

isVisible, isTouchable

Reimplements: touchgfx::Drawable::getLastChild

Reimplemented by: touchgfx::ScrollableContainer::getLastChild

getSolidRect

virtual Rect getSolidRect	(			)	const

Get (the largest possible) rectangle that is guaranteed to be solid (opaque).

This information is important, as any Drawable underneath the solid area does not need to be drawn.

Returns:

The solid rectangle part of the Drawable.

Note

The rectangle returned must be relative to upper left corner of the Drawable, meaning that a completely solid widget should return the full size Rect(0, 0, getWidth(), getHeight()). If no area can be guaranteed to be solid, an empty Rect(0, 0, 0, 0) must be returned. Failing to return the correct rectangle may result in errors on the display.

Reimplements: touchgfx::Drawable::getSolidRect

insert

virtual void insert	(	Drawable *	previous ,
		Drawable &	d
		)

Inserts a Drawable after a specific child node.

If previous child node is 0, the drawable will be inserted as the first element in the list. The first element in the list of children is the element drawn first, so this makes it possible to insert a Drawablebehind all previously added children.

Parameters:

previous	The Drawable to insert after. If null, insert as header.
d	The Drawable to insert.

Note

As with add, do not add the same drawable twice.

Reimplemented by: touchgfx::ListLayout::insert

remove

virtual void remove	(	Drawable &	d	)

Removes a Drawable from the container by removing it from the linked list of children.

If the Drawable is not in the list of children, nothing happens. It is possible to remove an element from whichever Container it is a member of using:

if (d.getParent()) d.getParent()->remove(d);

The Drawable will have the parent and next sibling cleared, but is otherwise left unaltered.

Parameters:

d	The Drawable to remove.

Note

This is safe to call even if d is not a child of this Container (in which case nothing happens).

Reimplemented by: touchgfx::ListLayout::remove, touchgfx::ModalWindow::remove, touchgfx::SlideMenu::remove, touchgfx::SwipeContainer::remove

removeAll

virtual void removeAll	(			)

Removes all children in the Container by resetting their parent and sibling pointers.

Please note that this is not done recursively, so any child which is itself a Container is not emptied.

Reimplemented by: touchgfx::ListLayout::removeAll

unlink

virtual void unlink	(			)

Removes all children by unlinking the first child.

The parent and sibling pointers of the children are not reset.

See also:

getFirstChild

Protected Functions Documentation

getContainedArea

virtual Rect getContainedArea	(			)	const

Gets a rectangle describing the total area covered by the children of this container.

Returns:

Rectangle covering all children.

Reimplemented by: touchgfx::ScrollableContainer::getContainedArea

moveChildrenRelative

virtual void moveChildrenRelative	(	int16_t	deltaX ,
		int16_t	deltaY
		)

Calls moveRelative on all children.

Parameters:

deltaX	Horizontal displacement.
deltaY	Vertical displacement.

Reimplemented by: touchgfx::ScrollableContainer::moveChildrenRelative

Protected Attributes Documentation

firstChild

Drawable * firstChild

Pointer to the first child of this container. Subsequent children can be found through firstChild's nextSibling.