ej.mwt.stylesheet.cascading

Class CascadingStylesheet

java.lang.Object

ej.mwt.stylesheet.cascading.CascadingStylesheet

All Implemented Interfaces:

Stylesheet

public class CascadingStylesheet
extends Object
implements Stylesheet

Cascading stylesheet implementation strongly inspired by CSS.

This stylesheet contains:

• a default style that defines all the attributes,
• a set of rules with a selector and a partial style.

The style of a widget is determined following these steps:

1. create an empty result style (no attributes set),
2. merge widget with matching selectors rules (set by getSelectorStyle(Selector)),
3. recursively merge with inherited attributes of parents (repeat previous step for parent recursively) (see Widget.getParent()),
4. merge global style (set by getDefaultStyle()).

The merge consists in completing the result style with all the set attributes of another style (see Style). The result style is complete at the end of the resolution.

The implementation assumes that the style of the parent is resolved prior to the resolution of its children. It simplifies the cascading resolution because it avoids recursive resolution upward. In other words, that means that the resolution of the styles in a hierarchy must be done from top to bottom. That is the case for the widgets since Widget.updateStyle() is recursive (see Container.updateStyle()).

Constructor Summary

Constructors

Constructor and Description
CascadingStylesheet() Creates a new cascading stylesheet.

Method Summary

Modifier and Type	Method and Description
EditableStyle	getDefaultStyle() Gets the default style.
EditableStyle	getSelectorStyle(Selector selector) Gets the style for a selector.
Style	getStyle(Widget widget) Gets the style for a widget.
void	reset() Resets the stylesheet to its initial state.
void	resetDefaultStyle() Resets the default style attributes to their initial value.
void	resetSelectorStyle(Selector selector) Resets the style attributes for a selector.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CascadingStylesheet

public CascadingStylesheet()

Creates a new cascading stylesheet.

Method Detail

getDefaultStyle

public EditableStyle getDefaultStyle()

Gets the default style. The style can be modified.

This style is used as the root style of the cascading resolution. Its initial attributes are equal to the values defined in DefaultStyle.

Returns:

the editable default style.

getSelectorStyle

public EditableStyle getSelectorStyle(Selector selector)

Gets the style for a selector. The style can be modified.

This style is applied to the widgets matching the selector.

Parameters:

selector - the selector.

Returns:

the editable style for the given selector.

getStyle

public Style getStyle(Widget widget)

Description copied from interface: Stylesheet

Gets the style for a widget.

Specified by:

getStyle in interface Stylesheet

Parameters:

widget - the widget to get the style for.

Returns:

the style applied to the widget.

reset

public void reset()

Resets the stylesheet to its initial state.

resetDefaultStyle

public void resetDefaultStyle()

Resets the default style attributes to their initial value.

resetSelectorStyle

public void resetSelectorStyle(Selector selector)

Resets the style attributes for a selector.

Parameters:

selector - the selector.