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comparison dwtx/ui/forms/widgets/LayoutCache.d @ 75:5d489b9f966c

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Fix continue porting
author Frank Benoit <benoit@tionex.de>
date Sat, 24 May 2008 05:11:16 +0200
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74:dad2e11b8ae4 75:5d489b9f966c
1 /*******************************************************************************
2 * Copyright (c) 2004, 2005 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.ui.forms.widgets.LayoutCache;
14
15 import dwtx.ui.forms.widgets.SizeCache;
16
17 import dwt.graphics.Point;
18 import dwt.widgets.Control;
19
20 import dwt.dwthelper.utils;
21
22 /**
23 * Caches the preferred sizes of an array of controls
24 *
25 * @since 3.0
26 */
27 public class LayoutCache {
28 private SizeCache[] caches;
29
30 /**
31 * Creates an empty layout cache
32 */
33 public this() {
34 }
35
36 /**
37 * Creates a cache for the given array of controls
38 *
39 * @param controls
40 */
41 public this(Control[] controls) {
42 rebuildCache(controls);
43 }
44
45 /**
46 * Returns the size cache for the given control
47 *
48 * @param idx
49 * @return the size cache for the given control
50 */
51 public SizeCache getCache(int idx) {
52 return caches[idx];
53 }
54
55 /**
56 * Sets the controls that are being cached here. If these are the same
57 * controls that were used last time, this method does nothing. Otherwise,
58 * the cache is flushed and a new cache is created for the new controls.
59 *
60 * @param controls
61 */
62 public void setControls(Control[] controls) {
63 // If the number of controls has changed, discard the entire cache
64 if (controls.length !is caches.length) {
65 rebuildCache(controls);
66 return;
67 }
68
69 for (int idx = 0; idx < controls.length; idx++) {
70 caches[idx].setControl(controls[idx]);
71 }
72 }
73
74 /**
75 * Creates a new size cache for the given set of controls, discarding any
76 * existing cache.
77 *
78 * @param controls the controls whose size is being cached
79 */
80 private void rebuildCache(Control[] controls) {
81 SizeCache[] newCache = new SizeCache[controls.length];
82
83 for (int idx = 0; idx < controls.length; idx++) {
84 // Try to reuse existing caches if possible
85 if (idx < caches.length) {
86 newCache[idx] = caches[idx];
87 newCache[idx].setControl(controls[idx]);
88 } else {
89 newCache[idx] = new SizeCache(controls[idx]);
90 }
91 }
92
93 caches = newCache;
94 }
95
96 /**
97 * Computes the preferred size of the nth control
98 *
99 * @param controlIndex index of the control whose size will be computed
100 * @param widthHint width of the control (or DWT.DEFAULT if unknown)
101 * @param heightHint height of the control (or DWT.DEFAULT if unknown)
102 * @return the preferred size of the control
103 */
104 public Point computeSize(int controlIndex, int widthHint, int heightHint) {
105 return caches[controlIndex].computeSize(widthHint, heightHint);
106 }
107
108 /**
109 * Flushes the cache for the given control. This should be called if exactly
110 * one of the controls has changed but the remaining controls remain unmodified
111 *
112 * @param controlIndex
113 */
114 public void flush(int controlIndex) {
115 caches[controlIndex].flush();
116 }
117
118 /**
119 * Flushes the cache.
120 */
121 public void flush() {
122 for (int idx = 0; idx < caches.length; idx++) {
123 caches[idx].flush();
124 }
125 }
126 }