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including merge of PR eclipse-platform#1690
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...s/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewerSelectionColorListener.java
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package org.eclipse.jface.viewers; | ||
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import org.eclipse.jface.resource.ColorRegistry; | ||
import org.eclipse.jface.resource.JFaceResources; | ||
import org.eclipse.swt.SWT; | ||
import org.eclipse.swt.graphics.GC; | ||
import org.eclipse.swt.widgets.Control; | ||
import org.eclipse.swt.widgets.Event; | ||
import org.eclipse.swt.widgets.Listener; | ||
import org.eclipse.swt.widgets.Scrollable; | ||
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/** | ||
* EraseItem event listener that takes care of coloring the selection color of | ||
* column viewers. The coloring is only applied if no other erase item listener | ||
* is registered for the viewer. If other erase item listeners are registers, | ||
* most probably a other customer coloring is applied and should not be | ||
* overwritten. | ||
* | ||
* @since 3.4 | ||
* @see FocusCellOwnerDrawHighlighter | ||
*/ | ||
public class ColumnViewerSelectionColorListener implements Listener { | ||
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/** | ||
* Registers an erase item event listener that takes care of coloring the | ||
* selection color of the given viewer. | ||
* | ||
* @param viewer The viewer that should be colored | ||
*/ | ||
public static void addListenerToViewer(StructuredViewer viewer) { | ||
viewer.getControl().addListener(SWT.EraseItem, new ColumnViewerSelectionColorListener()); | ||
} | ||
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@Override | ||
public void handleEvent(Event event) { | ||
if ((event.detail & SWT.SELECTED) == 0) { | ||
return; /* item not selected */ | ||
} | ||
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Listener[] eraseItemListeners = event.widget.getListeners(SWT.EraseItem); | ||
if (eraseItemListeners.length != 1) { | ||
return; /* other eraseItemListener exists, do not apply coloring */ | ||
} | ||
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GC gc = event.gc; | ||
ColorRegistry colorRegistry = JFaceResources.getColorRegistry(); | ||
if (event.widget instanceof Control control && control.isFocusControl()) { | ||
gc.setBackground(colorRegistry.get("org.eclipse.ui.workbench.SELECTED_CELL_BACKGROUND")); //$NON-NLS-1$ | ||
gc.setForeground(colorRegistry.get("org.eclipse.ui.workbench.SELECTED_CELL_FOREGROUND")); //$NON-NLS-1$ | ||
} else { | ||
gc.setBackground(colorRegistry.get("org.eclipse.ui.workbench.SELECTED_CELL_BACKGROUND_NO_FOCUS")); //$NON-NLS-1$ | ||
gc.setForeground(colorRegistry.get("org.eclipse.ui.workbench.SELECTED_CELL_FOREGROUND_NO_FOCUS")); //$NON-NLS-1$ | ||
} | ||
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int width = event.width; | ||
if (event.widget instanceof Scrollable scrollable) { | ||
width = scrollable.getClientArea().width; | ||
} | ||
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gc.fillRectangle(0, event.y, width, event.height); | ||
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event.detail &= ~SWT.SELECTED; | ||
} | ||
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} |
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