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Difference between revisions of "E4/CSS/Add Selector"
(New page: This wiki is a "how-to" that will explain the steps needed to add a CSS Selector in E4.) |
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This wiki is a "how-to" that will explain the steps needed to add a CSS Selector in E4. | This wiki is a "how-to" that will explain the steps needed to add a CSS Selector in E4. | ||
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| + | |||
| + | - Create a class in org.eclipse.e4.ui.css.swt.selectors, and name it "DynamicPseudoClassesSWTxxxxHandler" where "xxxx" is the name of the selector | ||
| + | |||
| + | |||
| + | - Make this new class extend "AbstractDynamicPseudoClassesControlHandler" | ||
| + | public class DynamicPseudoClassesSWTActiveHandler extends AbstractDynamicPseudoClassesControlHandler | ||
| + | |||
| + | |||
| + | - Add the following two methods: | ||
| + | protected void intialize(final Control control, final CSSEngine engine) {} | ||
| + | protected void dispose(Control control, CSSEngine engine) {} | ||
| + | |||
| + | Note: method name is intilize is not initialize | ||
| + | |||
| + | |||
| + | - In the intialize method, add the code needed (most likely listeners to look for change of state). For an example, see org.eclipse.e4.ui.css.swt.selectors.DynamicPseudoClassesSWTActiveHandler | ||
| + | |||
| + | |||
| + | - Make use of the setData() method on the widget (to get information about the widget in another class), as well as applying the styles to the engine. For example, in a listener's method, you can do the following: | ||
| + | try { | ||
| + | control.setData("Some Qualified String", Boolean.TRUE); | ||
| + | engine.applyStyles(control, false, true); | ||
| + | } catch (Exception ex) { | ||
| + | engine.handleExceptions(ex); | ||
| + | } | ||
| + | |||
| + | |||
| + | - It is preferable to use a qualified string, and to keep it in org.eclipse.e4.ui.css.swt.CSSSWTConstants | ||
| + | |||
| + | |||
| + | - In the dispose method, get rid of all listeners that were created in the above intialize method | ||
| + | |||
| + | |||
| + | - | ||
Revision as of 10:26, 21 April 2009
This wiki is a "how-to" that will explain the steps needed to add a CSS Selector in E4.
- Create a class in org.eclipse.e4.ui.css.swt.selectors, and name it "DynamicPseudoClassesSWTxxxxHandler" where "xxxx" is the name of the selector
- Make this new class extend "AbstractDynamicPseudoClassesControlHandler"
public class DynamicPseudoClassesSWTActiveHandler extends AbstractDynamicPseudoClassesControlHandler
- Add the following two methods:
protected void intialize(final Control control, final CSSEngine engine) {}
protected void dispose(Control control, CSSEngine engine) {}
Note: method name is intilize is not initialize
- In the intialize method, add the code needed (most likely listeners to look for change of state). For an example, see org.eclipse.e4.ui.css.swt.selectors.DynamicPseudoClassesSWTActiveHandler
- Make use of the setData() method on the widget (to get information about the widget in another class), as well as applying the styles to the engine. For example, in a listener's method, you can do the following:
try {
control.setData("Some Qualified String", Boolean.TRUE);
engine.applyStyles(control, false, true);
} catch (Exception ex) {
engine.handleExceptions(ex);
}
- It is preferable to use a qualified string, and to keep it in org.eclipse.e4.ui.css.swt.CSSSWTConstants
- In the dispose method, get rid of all listeners that were created in the above intialize method
-