Attachment 90165 Details for Bug 197953 – Proposal of modified FocusCellOwnerDrawHighlighter

Proposal of modified FocusCellOwnerDrawHighlighter

FocusCellMyOwnerDrawHighlighter.java (text/plain), 5.25 KB, created by Pavel Sklenak

on 2008-02-20 06:13:57 EST

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Creator: Pavel Sklenak

Created: 2008-02-20 06:13:57 EST

Size: 5.25 KB

patch

obsolete

>/*******************************************************************************
> * Copyright (c) 2007 IBM Corporation and others.
> * All rights reserved. This program and the accompanying materials
> * are made available under the terms of the Eclipse Public License v1.0
> * which accompanies this distribution, and is available at
> * http://www.eclipse.org/legal/epl-v10.html
> *
> * Contributors:
> * 	   Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
> * 												 - fix for bug 183850, 182652
> *     IBM Corporation - initial API and implementation
> ******************************************************************************/
>
>package org.eclipse.jface.viewers;
>
>import org.eclipse.core.runtime.Assert;
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.graphics.Color;
>import org.eclipse.swt.graphics.GC;
>import org.eclipse.swt.graphics.Rectangle;
>import org.eclipse.swt.widgets.Event;
>import org.eclipse.swt.widgets.Listener;
>
>/**
> * @since 3.3
> * 
> */
>public class FocusCellMyOwnerDrawHighlighter extends FocusCellHighlighter {
>
>	private ViewerCell oldCell;
>
>	// Needed to work-around problem in bug 183850
>	private static final boolean WIN_32 = "win32".equals(SWT.getPlatform()); //$NON-NLS-1$
>	private ColumnViewer viewer;
>	private int index;
>	private Object item;
>	
>	/**
>	 * @param viewer
>	 *            the viewer
>	 */
>	public FocusCellMyOwnerDrawHighlighter(ColumnViewer viewer) {
>		super(viewer);
>		this.viewer = viewer;
>		hookListener();
>	}
>
>	private void markFocusedCell(Event event, ViewerCell cell) {
>		Color background = null;
>		Color foreground = null;
>
>		if ( WIN_32 || foreground != null || background != null) {
>			GC gc = event.gc;
>
>			if (background == null) {
>				background = cell.getItem().getDisplay().getSystemColor(
>						SWT.COLOR_LIST_SELECTION);
>			}
>
>			if (foreground == null) {
>				foreground = cell.getItem().getDisplay().getSystemColor(
>						SWT.COLOR_LIST_SELECTION_TEXT);
>			}
>
>			gc.setBackground(background);
>			gc.setForeground(foreground);
>			gc.fillRectangle(event.getBounds());
>
>			// This is a workaround for an SWT-Bug on WinXP bug 169517
>			gc.drawText(" ", cell.getBounds().x, cell.getBounds().y, false); //$NON-NLS-1$
>			event.detail &= ~SWT.SELECTED;
>		}
>	}
>
>	private void removeSelectionInformation(Event event, ViewerCell cell) {
>		Color background = getSelectedCellBackgroundColor(cell);
>		Color foreground = getSelectedCellForegroundColor(cell);
>		
>		GC gc = event.gc;
>		
>		if(background == null) {
>			background = cell.getViewerRow().getBackground(
>					cell.getColumnIndex());
>		}
>		
>		if(foreground == null) {
>			foreground = cell.getViewerRow().getForeground(
>					cell.getColumnIndex());
>		}
>		
>		gc.setBackground(background);
>		gc.setForeground(foreground);
>		gc.fillRectangle(cell.getBounds());
>		// This is a workaround for an SWT-Bug on WinXP bug 169517
>		gc.drawText(" ", cell.getBounds().x, cell.getBounds().y, false); //$NON-NLS-1$
>		event.detail &= ~SWT.SELECTED;
>	}
>
>	private void hookListener() {
>
>		Listener listener = new Listener() {
>
>			public void handleEvent(Event event) {
>				if ((event.detail & SWT.SELECTED) > 0) {
>					ViewerCell focusCell = getFocusCell();
>					ViewerRow row = viewer.getViewerRowFromItem(event.item);
>
>					Assert
>							.isNotNull(row,
>									"Internal structure invalid. Item without associated row is not possible."); //$NON-NLS-1$
>
>					ViewerCell cell = row.getCell(event.index);
>
>//					if (focusCell == null || !cell.equals(focusCell)) {
>//						removeSelectionInformation(event, cell);
>//					} else {
>//						markFocusedCell(event, cell);
>//					}
>//					
>					if (cell.equals(focusCell)) {
>						removeSelectionInformation(event, cell);
>						notifyTraverse(event);
>					} else {
>						markFocusedCell(event, cell);
>					}
>				}
>			}
>
>		};
>		viewer.getControl().addListener(SWT.EraseItem, listener);
>	}
>	
>	/**
>	 * Send event to viewer's control (SWT.Traverse)
>	 * @param event
>	 */
>	protected void notifyTraverse(Event event){
>		if(event.index != index || event.item != item){
>			index = event.index;
>			item = event.item;
>			viewer.getControl().notifyListeners(SWT.Traverse, event);
>		}
>	}
>
>	/**
>	 * @param cell
>	 *            the cell which is colored
>	 * @return the color
>	 */
>	protected Color getSelectedCellBackgroundColor(ViewerCell cell) {
>		return null;
>	}
>
>	/**
>	 * @param cell
>	 *            the cell which is colored
>	 * @return the color
>	 */
>	protected Color getSelectedCellForegroundColor(ViewerCell cell) {
>		return null;
>	}
>
>	/*
>	 * (non-Javadoc)
>	 * 
>	 * @see org.eclipse.jface.viewers.FocusCellHighlighter#focusCellChanged(org.eclipse.jface.viewers.ViewerCell)
>	 */
>	protected void focusCellChanged(ViewerCell cell) {
>		super.focusCellChanged(cell);
>
>		// Redraw new area
>		if (cell != null) {
>			redrawArea(cell);
>		}
>
>		if (oldCell != null) {
>			redrawArea(oldCell);
>		}
>
>		this.oldCell = cell;
>	}
>	
>	private void redrawArea(ViewerCell cell){
>		Rectangle rect = cell.getBounds();
>		int x = cell.getColumnIndex() == 0 ? 0 : rect.x;
>		int width = cell.getColumnIndex() == 0 ? rect.x + rect.width
>				: rect.width;
>		// 1 is a fix for Linux-GTK
>		cell.getControl().redraw(x, rect.y-1, width, rect.height+1, true);
>	}
>}

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Attachments on bug 197953: 74677 | 90165 | 90189 | 100632 | 100633