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comparison dwtx/jface/internal/text/TableOwnerDrawSupport.d @ 129:eb30df5ca28b

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Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
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children c4fb132a086c
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.jface.internal.text.TableOwnerDrawSupport;
14
15 import dwt.dwthelper.utils;
16
17 import dwt.DWT;
18 import dwt.custom.StyleRange;
19 import dwt.graphics.Color;
20 import dwt.graphics.GC;
21 import dwt.graphics.Image;
22 import dwt.graphics.Rectangle;
23 import dwt.graphics.TextLayout;
24 import dwt.widgets.Event;
25 import dwt.widgets.Listener;
26 import dwt.widgets.Table;
27 import dwt.widgets.TableItem;
28
29
30 /**
31 * Adds owner draw support for tables.
32 *
33 * @since 3.4
34 */
35 public class TableOwnerDrawSupport : Listener {
36
37 private static final String STYLED_RANGES_KEY= "styled_ranges"; //$NON-NLS-1$
38
39 private TextLayout fLayout;
40
41 public static void install(Table table) {
42 TableOwnerDrawSupport listener= new TableOwnerDrawSupport(table);
43 table.addListener(DWT.Dispose, listener);
44 table.addListener(DWT.MeasureItem, listener);
45 table.addListener(DWT.EraseItem, listener);
46 table.addListener(DWT.PaintItem, listener);
47 }
48
49 /**
50 * Stores the styled ranges in the given table item.
51 *
52 * @param item table item
53 * @param column the column index
54 * @param ranges the styled ranges or <code>null</code> to remove them
55 */
56 public static void storeStyleRanges(TableItem item, int column, StyleRange[] ranges) {
57 item.setData(STYLED_RANGES_KEY + column, ranges);
58 }
59
60 /**
61 * Returns the styled ranges which are stored in the given table item.
62 *
63 * @param item table item
64 * @param column the column index
65 * @return the styled ranges
66 */
67 private static StyleRange[] getStyledRanges(TableItem item, int column) {
68 return (StyleRange[])item.getData(STYLED_RANGES_KEY + column);
69 }
70
71 private TableOwnerDrawSupport(Table table) {
72 int orientation= table.getStyle() & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT);
73 fLayout= new TextLayout(table.getDisplay());
74 fLayout.setOrientation(orientation);
75 }
76
77 /*
78 * @see dwt.widgets.Listener#handleEvent(dwt.widgets.Event)
79 */
80 public void handleEvent(Event event) {
81 switch (event.type) {
82 case DWT.MeasureItem:
83 break;
84 case DWT.EraseItem:
85 event.detail &= ~DWT.FOREGROUND;
86 break;
87 case DWT.PaintItem:
88 performPaint(event);
89 break;
90 case DWT.Dispose:
91 widgetDisposed();
92 break;
93 }
94 }
95
96 /**
97 * Performs the paint operation.
98 *
99 * @param event the event
100 */
101 private void performPaint(Event event) {
102 TableItem item= (TableItem) event.item;
103 GC gc= event.gc;
104 int index= event.index;
105
106 bool isSelected= (event.detail & DWT.SELECTED) !is 0;
107
108 // Remember colors to restore the GC later
109 Color oldForeground= gc.getForeground();
110 Color oldBackground= gc.getBackground();
111
112 if (!isSelected) {
113 Color foreground= item.getForeground(index);
114 gc.setForeground(foreground);
115
116 Color background= item.getBackground(index);
117 gc.setBackground(background);
118 }
119
120 Image image=item.getImage(index);
121 if (image !is null) {
122 Rectangle imageBounds=item.getImageBounds(index);
123 Rectangle bounds=image.getBounds();
124 int x=imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2);
125 int y=imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2);
126 gc.drawImage(image, x, y);
127 }
128
129 fLayout.setFont(item.getFont(index));
130
131 // XXX: needed to clear the style info, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=226090
132 fLayout.setText(""); //$NON-NLS-1$
133
134 fLayout.setText(item.getText(index));
135
136 StyleRange[] ranges= getStyledRanges(item, index);
137 if (ranges !is null) {
138 for (int i= 0; i < ranges.length; i++) {
139 StyleRange curr= ranges[i];
140 if (isSelected) {
141 curr= (StyleRange) curr.clone();
142 curr.foreground= null;
143 curr.background= null;
144 }
145 fLayout.setStyle(curr, curr.start, curr.start + curr.length - 1);
146 }
147 }
148
149 Rectangle textBounds=item.getTextBounds(index);
150 if (textBounds !is null) {
151 Rectangle layoutBounds=fLayout.getBounds();
152 int x=textBounds.x;
153 int y=textBounds.y + Math.max(0, (textBounds.height - layoutBounds.height) / 2);
154 fLayout.draw(gc, x, y);
155 }
156
157 if ((event.detail & DWT.FOCUSED) !is 0) {
158 Rectangle focusBounds=item.getBounds();
159 gc.drawFocus(focusBounds.x, focusBounds.y, focusBounds.width, focusBounds.height);
160 }
161
162 if (!isSelected) {
163 gc.setForeground(oldForeground);
164 gc.setBackground(oldBackground);
165 }
166 }
167
168 private void widgetDisposed() {
169 fLayout.dispose();
170 }
171 }
172