Mercurial > projects > dwt-linux
annotate dwt/custom/ControlEditor.d @ 115:52b32f5cb1e0
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author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 19 Jan 2008 13:08:19 +0100 |
parents | 0f12f6bb9739 |
children | c0d810de7093 |
rev | line source |
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52b32f5cb1e0
many file checked for switch default
Frank Benoit <benoit@tionex.de>
parents:
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1 /******************************************************************************* |
101 | 2 * Copyright (c) 2000, 2007 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 | |
108 | 10 * Port to the D programming language: |
11 * Frank Benoit <benoit@tionex.de> | |
101 | 12 *******************************************************************************/ |
13 module dwt.custom.ControlEditor; | |
14 | |
15 | |
16 | |
17 import dwt.DWT; | |
18 import dwt.graphics.Rectangle; | |
19 import dwt.widgets.Composite; | |
20 import dwt.widgets.Control; | |
21 import dwt.widgets.Event; | |
22 import dwt.widgets.Listener; | |
23 import dwt.widgets.ScrollBar; | |
24 | |
25 /** | |
26 * | |
27 * A ControlEditor is a manager for a Control that appears above a composite and tracks with the | |
28 * moving and resizing of that composite. It can be used to display one control above | |
29 * another control. This could be used when editing a control that does not have editing | |
30 * capabilities by using a text editor or for launching a dialog by placing a button | |
31 * above a control. | |
32 * | |
33 * <p> Here is an example of using a ControlEditor: | |
34 * | |
35 * <code><pre> | |
36 * Canvas canvas = new Canvas(shell, DWT.BORDER); | |
37 * canvas.setBounds(10, 10, 300, 300); | |
38 * Color color = new Color(null, 255, 0, 0); | |
39 * canvas.setBackground(color); | |
40 * ControlEditor editor = new ControlEditor (canvas); | |
41 * // The editor will be a button in the bottom right corner of the canvas. | |
42 * // When selected, it will launch a Color dialog that will change the background | |
43 * // of the canvas. | |
44 * Button button = new Button(canvas, DWT.PUSH); | |
45 * button.setText("Select Color..."); | |
46 * button.addSelectionListener (new SelectionAdapter() { | |
47 * public void widgetSelected(SelectionEvent e) { | |
48 * ColorDialog dialog = new ColorDialog(shell); | |
49 * dialog.open(); | |
50 * RGB rgb = dialog.getRGB(); | |
51 * if (rgb !is null) { | |
52 * if (color !is null) color.dispose(); | |
53 * color = new Color(null, rgb); | |
54 * canvas.setBackground(color); | |
55 * } | |
56 * | |
57 * } | |
58 * }); | |
59 * | |
60 * editor.horizontalAlignment = DWT.RIGHT; | |
61 * editor.verticalAlignment = DWT.BOTTOM; | |
62 * editor.grabHorizontal = false; | |
63 * editor.grabVertical = false; | |
64 * Point size = button.computeSize(DWT.DEFAULT, DWT.DEFAULT); | |
65 * editor.minimumWidth = size.x; | |
66 * editor.minimumHeight = size.y; | |
67 * editor.setEditor (button); | |
68 * </pre></code> | |
69 */ | |
70 public class ControlEditor { | |
71 | |
72 /** | |
73 * Specifies how the editor should be aligned relative to the control. Allowed values | |
74 * are DWT.LEFT, DWT.RIGHT and DWT.CENTER. The default value is DWT.CENTER. | |
75 */ | |
76 public int horizontalAlignment = DWT.CENTER; | |
77 | |
78 /** | |
79 * Specifies whether the editor should be sized to use the entire width of the control. | |
80 * True means resize the editor to the same width as the cell. False means do not adjust | |
81 * the width of the editor. The default value is false. | |
82 */ | |
83 public bool grabHorizontal = false; | |
84 | |
85 /** | |
86 * Specifies the minimum width the editor can have. This is used in association with | |
87 * a true value of grabHorizontal. If the cell becomes smaller than the minimumWidth, the | |
88 * editor will not made smaller than the minimum width value. The default value is 0. | |
89 */ | |
90 public int minimumWidth = 0; | |
91 | |
92 /** | |
93 * Specifies how the editor should be aligned relative to the control. Allowed values | |
94 * are DWT.TOP, DWT.BOTTOM and DWT.CENTER. The default value is DWT.CENTER. | |
95 */ | |
96 public int verticalAlignment = DWT.CENTER; | |
97 | |
98 /** | |
99 * Specifies whether the editor should be sized to use the entire height of the control. | |
100 * True means resize the editor to the same height as the underlying control. False means do not adjust | |
101 * the height of the editor. The default value is false. | |
102 */ | |
103 public bool grabVertical = false; | |
104 | |
105 /** | |
106 * Specifies the minimum height the editor can have. This is used in association with | |
107 * a true value of grabVertical. If the control becomes smaller than the minimumHeight, the | |
108 * editor will not made smaller than the minimum height value. The default value is 0. | |
109 */ | |
110 public int minimumHeight = 0; | |
111 | |
112 Composite parent; | |
113 Control editor; | |
114 private bool hadFocus; | |
115 private Listener controlListener; | |
116 private Listener scrollbarListener; | |
117 | |
118 private final static int [] EVENTS = [DWT.KeyDown, DWT.KeyUp, DWT.MouseDown, DWT.MouseUp, DWT.Resize]; | |
119 /** | |
120 * Creates a ControlEditor for the specified Composite. | |
121 * | |
122 * @param parent the Composite above which this editor will be displayed | |
123 * | |
124 */ | |
125 public this (Composite parent) { | |
126 this.parent = parent; | |
127 | |
128 controlListener = new class() Listener { | |
129 public void handleEvent(Event e) { | |
130 layout (); | |
131 } | |
132 }; | |
133 for (int i=0; i<EVENTS.length; i++) { | |
134 parent.addListener (EVENTS [i], controlListener); | |
135 } | |
136 | |
137 scrollbarListener = new class() Listener { | |
138 public void handleEvent(Event e) { | |
139 scroll (e); | |
140 } | |
141 }; | |
142 ScrollBar hBar = parent.getHorizontalBar (); | |
143 if (hBar !is null) hBar.addListener (DWT.Selection, scrollbarListener); | |
144 ScrollBar vBar = parent.getVerticalBar (); | |
145 if (vBar !is null) vBar.addListener (DWT.Selection, scrollbarListener); | |
146 } | |
147 Rectangle computeBounds () { | |
148 Rectangle clientArea = parent.getClientArea(); | |
149 Rectangle editorRect = new Rectangle(clientArea.x, clientArea.y, minimumWidth, minimumHeight); | |
150 | |
151 if (grabHorizontal) | |
152 editorRect.width = Math.max(clientArea.width, minimumWidth); | |
153 | |
154 if (grabVertical) | |
155 editorRect.height = Math.max(clientArea.height, minimumHeight); | |
156 | |
157 switch (horizontalAlignment) { | |
158 case DWT.RIGHT: | |
159 editorRect.x += clientArea.width - editorRect.width; | |
160 break; | |
161 case DWT.LEFT: | |
162 // do nothing - clientArea.x is the right answer | |
163 break; | |
164 default: | |
165 // default is CENTER | |
166 editorRect.x += (clientArea.width - editorRect.width)/2; | |
167 } | |
168 | |
169 switch (verticalAlignment) { | |
170 case DWT.BOTTOM: | |
171 editorRect.y += clientArea.height - editorRect.height; | |
172 break; | |
173 case DWT.TOP: | |
174 // do nothing - clientArea.y is the right answer | |
175 break; | |
176 default : | |
177 // default is CENTER | |
178 editorRect.y += (clientArea.height - editorRect.height)/2; | |
179 } | |
180 | |
181 | |
182 return editorRect; | |
183 | |
184 } | |
185 /** | |
186 * Removes all associations between the Editor and the underlying composite. The | |
187 * composite and the editor Control are <b>not</b> disposed. | |
188 */ | |
189 public void dispose () { | |
190 if (parent !is null && !parent.isDisposed()) { | |
191 for (int i=0; i<EVENTS.length; i++) { | |
192 parent.removeListener (EVENTS [i], controlListener); | |
193 } | |
194 ScrollBar hBar = parent.getHorizontalBar (); | |
195 if (hBar !is null) hBar.removeListener (DWT.Selection, scrollbarListener); | |
196 ScrollBar vBar = parent.getVerticalBar (); | |
197 if (vBar !is null) vBar.removeListener (DWT.Selection, scrollbarListener); | |
198 } | |
199 | |
200 parent = null; | |
201 editor = null; | |
202 hadFocus = false; | |
203 controlListener = null; | |
204 scrollbarListener = null; | |
205 } | |
206 /** | |
207 * Returns the Control that is displayed above the composite being edited. | |
208 * | |
209 * @return the Control that is displayed above the composite being edited | |
210 */ | |
211 public Control getEditor () { | |
212 return editor; | |
213 } | |
214 /** | |
215 * Lays out the control within the underlying composite. This | |
216 * method should be called after changing one or more fields to | |
217 * force the Editor to resize. | |
218 * | |
219 * @since 2.1 | |
220 */ | |
221 public void layout () { | |
222 if (editor is null || editor.isDisposed()) return; | |
223 if (editor.getVisible ()) { | |
224 hadFocus = editor.isFocusControl(); | |
225 } // this doesn't work because | |
226 // resizing the column takes the focus away | |
227 // before we get here | |
228 editor.setBounds (computeBounds ()); | |
229 if (hadFocus) { | |
230 if (editor is null || editor.isDisposed()) return; | |
231 editor.setFocus (); | |
232 } | |
233 } | |
234 void scroll (Event e) { | |
235 if (editor is null || editor.isDisposed()) return; | |
236 layout(); | |
237 } | |
238 /** | |
239 * Specify the Control that is to be displayed. | |
240 * | |
241 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent | |
242 * being the Composite specified in the ControlEditor constructor. | |
243 * | |
244 * @param editor the Control that is displayed above the composite being edited | |
245 */ | |
246 public void setEditor (Control editor) { | |
247 | |
248 if (editor is null) { | |
249 // this is the case where the caller is setting the editor to be blank | |
250 // set all the values accordingly | |
251 this.editor = null; | |
252 return; | |
253 } | |
254 | |
255 this.editor = editor; | |
256 layout(); | |
257 if (this.editor is null || this.editor.isDisposed()) return; | |
258 editor.setVisible(true); | |
259 } | |
260 } |