Attachment 228900 Details for Bug 75766 – EasyScroll - class for mouse wheel scrolling without manual focusing

EasyScroll - class for mouse wheel scrolling without manual focusing

file_75766.txt (text/plain), 2.46 KB, created by Tolya Vasiliev

on 2013-03-22 02:39:24 EDT

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Creator: Tolya Vasiliev

Created: 2013-03-22 02:39:24 EDT

Size: 2.46 KB

patch

obsolete

>import org.eclipse.swt.SWT;
>import org.eclipse.swt.custom.ScrolledComposite;
>import org.eclipse.swt.widgets.Composite;
>import org.eclipse.swt.widgets.Control;
>import org.eclipse.swt.widgets.Event;
>import org.eclipse.swt.widgets.Group;
>import org.eclipse.swt.widgets.Listener;
>
>/**
> * This class allows vertical mouse wheel scrolling without manual focus
> * It works with ScrolledComposite and sets focus to first control in child Composite
> * of ScrolledComposite with MouseEnter event (only if any of Composite controls not focused yet)
> */
>public class EasyScroll {
>
>	/**
>	 * @param scrolledComposite Target ScrolledComposite
>	 * @param setVerticalIncrementValue Allows setting vertical bar increment value 
>	 *            
>	 */
>	public static final void addEasyMouseWheelScroll(
>			final ScrolledComposite scrolledComposite, boolean setVerticalIncrementValue) {
>		if (setVerticalIncrementValue)
>			scrolledComposite.getVerticalBar().setIncrement(5);
>
>		final ScrollControl scrollControl = new ScrollControl();
>		
>		// Getting child composite of ScrolledComposite
>		Composite childComposite = null;
>		if (scrolledComposite.getChildren()[0] instanceof Composite)
>			childComposite = (Composite) scrolledComposite.getChildren()[0];		
>		
>		childComposite.addListener(SWT.MouseEnter, new Listener() {
>			public void handleEvent(Event e) {
>				if (!scrollControl.isAnotherControlInFocus)
>					scrolledComposite.setFocus();
>			}
>		});
>
>		scrollControl.checkControlsOnScroll(childComposite);
>	}
>
>}
>
>/**
> * Need to control scrolling
> */
>class ScrollControl {
>	boolean isAnotherControlInFocus = false;
>
>	/**
>	 * Correcting some bug with wrong focusing
>	 * @param composite
>	 */
>	public void checkControlsOnScroll(Composite composite) {
>		for (final Control control : composite.getChildren()) {
>			if (control instanceof Composite || control instanceof Group) {
>				checkControlsOnScroll((Composite) control);
>			} else {
>				control.addListener(SWT.MouseDown, new Listener() {
>					public void handleEvent(Event e) {
>						control.addListener(SWT.MouseExit, new Listener() {
>							public void handleEvent(Event e) {
>								control.setFocus();
>								isAnotherControlInFocus = true;
>								control.removeListener(SWT.MouseExit, this);
>							}
>						});
>						control.addListener(SWT.FocusOut, new Listener() {
>							public void handleEvent(Event e) {
>								isAnotherControlInFocus = false;
>							}
>						});
>					}
>				});
>
>			}
>		}
>	}
>}

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Attachments on bug 75766: 63769 | 90888 | 228900