ButtonWithLabel

touchgfx/widgets/ButtonWithLabel.hpp

A Button that has a bitmap with a text on top of it. It is possible to have two different colors for the text depending on the current state of the button (released or pressed).

Typical use case could be a red button with a normal and a pressed image. Those images can be reused across several buttons. The ButtonWithLabel will then allow a text to be superimposed on top of the red button.

See: Button

Inherits from: Button, AbstractButton, Widget, Drawable

Public Functions

	ButtonWithLabel()
virtual void	draw(const Rect & invalidatedArea) const
	Draw this drawable.
TextRotation	getLabelRotation()
	Gets the current rotation of the text on the label.
const TypedText &	getLabelText() const
	Gets the text used for the label.
void	setLabelColor(colortype col)
	Sets label color for the text when the button is in the normal, released state.
void	setLabelColorPressed(colortype col)
	Sets label color for the text when the button is in the pressed state.
void	setLabelRotation(TextRotation textRotation)
	Sets the rotation of the text on the label.
void	setLabelText(TypedText t)
	Sets the text to display on the button.
void	updateTextPosition()
	Positions the label text horizontally centered.

Protected Attributes

colortype	color
	The color used for the label when the button is in the released, normal state.
colortype	colorPressed
	The color used for the label when the button is in the pressed state.
TextRotation	rotation
	The rotation used for the label.
int16_t	textHeightIncludingSpacing
	Total height of the label (text height + spacing).
TypedText	typedText
	The TypedText used for the button label.

Additional inherited members

Public Functions inherited from Button

	Button()
uint8_t	getAlpha() const
	Gets the current alpha value of the widget.
Bitmap	getCurrentlyDisplayedBitmap() const
	Gets currently displayed bitmap.
virtual Rect	getSolidRect() const
	Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
virtual void	invalidateContent() const
	Tell the framework that the contents of the Drawable needs to be redrawn.
void	setAlpha(uint8_t newAlpha)
	Sets the opacity (alpha value).
virtual void	setBitmaps(const Bitmap & bitmapReleased, const Bitmap & bitmapPressed)
	Sets the two bitmaps used by this button.

Protected Attributes inherited from Button

uint8_t	alpha
	The current alpha value. 255=solid, 0=invisible.
Bitmap	down
	The image to display when button is pressed.
Bitmap	up
	The image to display when button is released (normal state).

Public Functions inherited from AbstractButton

	AbstractButton()
	Sets this Widget touchable so the user can interact with buttons.
virtual void	executeAction()
	Executes the previously set action.
virtual bool	getPressedState() const
	Function to determine if the AbstractButton is currently pressed.
virtual void	handleClickEvent(const ClickEvent & event)
	Updates the current state of the button.
void	setAction(GenericCallback< const AbstractButton & > & callback)
	Associates an action with the button.

Protected Attributes inherited from AbstractButton

GenericCallback< const AbstractButton & > *	action
	The callback to be executed when this AbstractButton is clicked.
bool	pressed
	Is the button pressed or released? True if pressed.

Public Functions inherited from Widget

virtual void	getLastChild(int16_t , int16_t , Drawable ** last)
	Since a Widget is only one Drawable, Widget::getLastChild simply yields itself as result, but only if the Widget isVisible and isTouchable.

Public Functions inherited from Drawable

void	center()
	Centers the Drawable inside its parent.
void	centerX()
	Center the Drawable horizontally inside its parent.
void	centerY()
	Center the Drawable vertically inside its parent.
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.
void	expand(int margin =0)
	Expands the Drawable to have the same size as its parent with a given margin around the edge.
Rect	getAbsoluteRect() const
	Helper function for obtaining the rectangle this Drawable covers, expressed in absolute coordinates.
virtual Drawable *	getFirstChild()
	Function for obtaining the first child of this drawable if any.
int16_t	getHeight() const
	Gets the height of this Drawable.
virtual void	getLastChild(int16_t x, int16_t y, Drawable ** last) =0
	Function for obtaining the the last child of this drawable that intersects with the specified point.
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	getSolidRect() const =0
	Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
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	invalidateContent() const
	Tell the framework that the contents of the 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 & other)
	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

ButtonWithLabel

ButtonWithLabel	(			)

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::Button::draw

getLabelRotation

TextRotation getLabelRotation	(			)

Gets the current rotation of the text on the label.

Returns:

The current rotation of the text.

getLabelText

const TypedText & getLabelText	(			)	const

Gets the text used for the label.

Returns:

The text used for the label.

setLabelColor

void setLabelColor	(	colortype	col	)

Sets label color for the text when the button is in the normal, released state.

Parameters:

col	The color with which the text label should be drawn.

Note

If the button is currently in the normal, released state, the button should be forced to redraw itself. This is done by calling invalidate() on the ButtonWithLabel. The user code must call invalidate() in order to update the button on the display.

See also:

setLabelColorPressed

setLabelColorPressed

void setLabelColorPressed	(	colortype	col	)

Sets label color for the text when the button is in the pressed state.

Parameters:

col	The color with which the text label should be drawn when the button is pressed.

Note

If the button is currently in the pressed state, the button should be forced to redraw itself. This is done by calling invalidate() on the ButtonWithLabel. The user code must call invalidate() in order to update the button on the display.

See also:

setLabelColor

setLabelRotation

void setLabelRotation	(	TextRotation	textRotation	)

Sets the rotation of the text on the label.

The text can be rotated in steps of 90 degrees.

Parameters:

textRotation	The rotation of the text. Default is TEXT_ROTATE_0.

Note

that this will not rotate the bitmap of the label, only the text. The user code must call invalidate() in order to update the button on the display.

See also:

TextArea::setRotation

setLabelText

void setLabelText	(	TypedText	t	)

Sets the text to display on the button.

Texts with wildcards are not supported.

Parameters:

t	The text to display.

Note

The user code must call invalidate() in order to update the button on the display.

updateTextPosition

void updateTextPosition	(			)

Positions the label text horizontally centered.

If the text changes due to a language change you may need to reposition the label text by calling this function to keep the text horizontally centered.

Note

The user code must call invalidate() in order to update the button on the display.

Protected Attributes Documentation

color

colortype color

The color used for the label when the button is in the released, normal state.

colorPressed

colortype colorPressed

The color used for the label when the button is in the pressed state.

rotation

TextRotation rotation

The rotation used for the label.

textHeightIncludingSpacing

int16_t textHeightIncludingSpacing

Total height of the label (text height + spacing).

typedText

TypedText typedText

The TypedText used for the button label.