ScrollBarStyler Class Reference

#include <Pt/Forms/ScrollBarStyler.h>

Binds a scroll bar to the current style renderer. More...

Inherits Styler.

Public Member Functions
	ScrollBarStyler ()
	Constructs an unbound scroll bar styler.
const Gfx::Brush &	background () const
	Returns the effective background brush.
void	setBackground (const Gfx::Brush &brush)
	Sets the widget-local background brush to brush.
const Gfx::Brush &	foreground () const
	Returns the effective foreground brush.
void	setForeground (const Gfx::Brush &brush)
	Sets the widget-local foreground brush to brush.
const Gfx::Pen &	contour () const
	Returns the effective contour pen.
void	setContour (const Gfx::Pen &pen)
	Sets the widget-local contour pen to pen.
Gfx::SizeF	measureFrame (PaintSurface &surface, const Gfx::SizeF &contentSize, Direction direction) const
	Measures the frame enclosing contentSize.
Gfx::SizeF	measureButton (PaintSurface &surface, Direction direction) const
	Measures a decrease or increase button for direction.
void	layoutChrome (PaintSurface &surface, const Gfx::RectF &rect, Direction direction, const Gfx::SizeF &buttonSize, Gfx::RectF &trackRect, Gfx::RectF &decreaseRect, Gfx::RectF &increaseRect) const
	Lays out the track and decrease and increase buttons within rect.
void	layoutHandle (PaintSurface &surface, const Gfx::RectF &trackRect, Direction direction, float fraction, float viewProportion, Gfx::RectF &handleRect) const
	Lays out the handle within trackRect.
void	renderChrome (PaintContext &context, const Gfx::RectF &rect, Direction direction, const Gfx::RectF &trackRect, const Gfx::RectF &handleRect, const Gfx::RectF &decreaseRect, const Gfx::RectF &increaseRect, const ScrollBarState &state) const
	Renders the scroll bar chrome within rect for state.
void	setRenderer (ScrollBarRenderer *renderer=0)
	Assigns a specific scroll bar renderer.
bool	bind (const Style &style, const StyleOptions &styleOptions)
	Binds this styler to style and styleOptions.
bool	isBound () const
	Returns true if a renderer is bound.

Protected Member Functions
virtual StyleOptions &	onBindOptions (const StyleOptions &global)
	Binds the overlay to global and returns it.
virtual Renderer *	onStyleRenderer (const Style &style)
	Returns the shared scroll-bar renderer from style, or 0.
virtual Renderer *	onCreateRenderer (const Style &style)
	Creates an independent clone of the style renderer, or 0.
void	init (Renderer *renderer)
	Replaces the bound renderer with renderer.

Detailed Description

A ScrollBar owns a ScrollBarStyler. Applications do not construct one. Call Styler::bind() from onInvalidate(). When the overlay has no local options, bind uses the shared renderer from the style. Local options use a private clone. setRenderer() keeps an assigned renderer until it is cleared. A null renderer falls back on the next bind.

Appearance getters return effective tokens after bind. Setters write widget-local options. Measure, layout, and paint call the typed methods on this styler, not a public renderer accessor.

Member Function Documentation

setRenderer()

void setRenderer

(

ScrollBarRenderer *

renderer = 0

)

A null renderer falls back to the current style on the next bind.

bind()

bool bind ( const Style & style, const StyleOptions & styleOptions )

inherited

Returns true when the effective renderer or the effective options changed.

init()

void init ( Renderer * renderer )

protectedinherited

A non-null renderer is a custom renderer. bind() keeps it until init() is called with 0, which falls back to the current style.