Mercurial > projects > dwt-addons
diff dwtx/jface/internal/text/TableOwnerDrawSupport.d @ 129:eb30df5ca28b
Added JFace Text sources
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 23 Aug 2008 19:10:48 +0200 |
parents | |
children | c4fb132a086c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dwtx/jface/internal/text/TableOwnerDrawSupport.d Sat Aug 23 19:10:48 2008 +0200 @@ -0,0 +1,172 @@ +/******************************************************************************* + * Copyright (c) 2008 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: + * IBM Corporation - initial API and implementation + * Port to the D programming language: + * Frank Benoit <benoit@tionex.de> + *******************************************************************************/ +module dwtx.jface.internal.text.TableOwnerDrawSupport; + +import dwt.dwthelper.utils; + +import dwt.DWT; +import dwt.custom.StyleRange; +import dwt.graphics.Color; +import dwt.graphics.GC; +import dwt.graphics.Image; +import dwt.graphics.Rectangle; +import dwt.graphics.TextLayout; +import dwt.widgets.Event; +import dwt.widgets.Listener; +import dwt.widgets.Table; +import dwt.widgets.TableItem; + + +/** + * Adds owner draw support for tables. + * + * @since 3.4 + */ +public class TableOwnerDrawSupport : Listener { + + private static final String STYLED_RANGES_KEY= "styled_ranges"; //$NON-NLS-1$ + + private TextLayout fLayout; + + public static void install(Table table) { + TableOwnerDrawSupport listener= new TableOwnerDrawSupport(table); + table.addListener(DWT.Dispose, listener); + table.addListener(DWT.MeasureItem, listener); + table.addListener(DWT.EraseItem, listener); + table.addListener(DWT.PaintItem, listener); + } + + /** + * Stores the styled ranges in the given table item. + * + * @param item table item + * @param column the column index + * @param ranges the styled ranges or <code>null</code> to remove them + */ + public static void storeStyleRanges(TableItem item, int column, StyleRange[] ranges) { + item.setData(STYLED_RANGES_KEY + column, ranges); + } + + /** + * Returns the styled ranges which are stored in the given table item. + * + * @param item table item + * @param column the column index + * @return the styled ranges + */ + private static StyleRange[] getStyledRanges(TableItem item, int column) { + return (StyleRange[])item.getData(STYLED_RANGES_KEY + column); + } + + private TableOwnerDrawSupport(Table table) { + int orientation= table.getStyle() & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT); + fLayout= new TextLayout(table.getDisplay()); + fLayout.setOrientation(orientation); + } + + /* + * @see dwt.widgets.Listener#handleEvent(dwt.widgets.Event) + */ + public void handleEvent(Event event) { + switch (event.type) { + case DWT.MeasureItem: + break; + case DWT.EraseItem: + event.detail &= ~DWT.FOREGROUND; + break; + case DWT.PaintItem: + performPaint(event); + break; + case DWT.Dispose: + widgetDisposed(); + break; + } + } + + /** + * Performs the paint operation. + * + * @param event the event + */ + private void performPaint(Event event) { + TableItem item= (TableItem) event.item; + GC gc= event.gc; + int index= event.index; + + bool isSelected= (event.detail & DWT.SELECTED) !is 0; + + // Remember colors to restore the GC later + Color oldForeground= gc.getForeground(); + Color oldBackground= gc.getBackground(); + + if (!isSelected) { + Color foreground= item.getForeground(index); + gc.setForeground(foreground); + + Color background= item.getBackground(index); + gc.setBackground(background); + } + + Image image=item.getImage(index); + if (image !is null) { + Rectangle imageBounds=item.getImageBounds(index); + Rectangle bounds=image.getBounds(); + int x=imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2); + int y=imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2); + gc.drawImage(image, x, y); + } + + fLayout.setFont(item.getFont(index)); + + // XXX: needed to clear the style info, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=226090 + fLayout.setText(""); //$NON-NLS-1$ + + fLayout.setText(item.getText(index)); + + StyleRange[] ranges= getStyledRanges(item, index); + if (ranges !is null) { + for (int i= 0; i < ranges.length; i++) { + StyleRange curr= ranges[i]; + if (isSelected) { + curr= (StyleRange) curr.clone(); + curr.foreground= null; + curr.background= null; + } + fLayout.setStyle(curr, curr.start, curr.start + curr.length - 1); + } + } + + Rectangle textBounds=item.getTextBounds(index); + if (textBounds !is null) { + Rectangle layoutBounds=fLayout.getBounds(); + int x=textBounds.x; + int y=textBounds.y + Math.max(0, (textBounds.height - layoutBounds.height) / 2); + fLayout.draw(gc, x, y); + } + + if ((event.detail & DWT.FOCUSED) !is 0) { + Rectangle focusBounds=item.getBounds(); + gc.drawFocus(focusBounds.x, focusBounds.y, focusBounds.width, focusBounds.height); + } + + if (!isSelected) { + gc.setForeground(oldForeground); + gc.setBackground(oldBackground); + } + } + + private void widgetDisposed() { + fLayout.dispose(); + } +} +