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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.ui.forms.widgets.LayoutCache;
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14
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15 import org.eclipse.ui.forms.widgets.SizeCache;
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16
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17 import org.eclipse.swt.graphics.Point;
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18 import org.eclipse.swt.widgets.Control;
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19
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20 import java.lang.all;
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21 import java.util.Set;
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22
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23 /**
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24 * Caches the preferred sizes of an array of controls
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25 *
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26 * @since 3.0
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27 */
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28 public class LayoutCache {
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29 private SizeCache[] caches;
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30
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31 /**
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32 * Creates an empty layout cache
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33 */
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34 public this() {
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35 }
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36
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37 /**
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38 * Creates a cache for the given array of controls
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39 *
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40 * @param controls
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41 */
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42 public this(Control[] controls) {
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43 rebuildCache(controls);
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44 }
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45
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46 /**
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47 * Returns the size cache for the given control
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48 *
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49 * @param idx
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50 * @return the size cache for the given control
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51 */
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52 public SizeCache getCache(int idx) {
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53 return caches[idx];
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54 }
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55
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56 /**
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57 * Sets the controls that are being cached here. If these are the same
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58 * controls that were used last time, this method does nothing. Otherwise,
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59 * the cache is flushed and a new cache is created for the new controls.
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60 *
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61 * @param controls
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62 */
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63 public void setControls(Control[] controls) {
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64 // If the number of controls has changed, discard the entire cache
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65 if (controls.length !is caches.length) {
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66 rebuildCache(controls);
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67 return;
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68 }
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69
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70 for (int idx = 0; idx < controls.length; idx++) {
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71 caches[idx].setControl(controls[idx]);
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72 }
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73 }
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74
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75 /**
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76 * Creates a new size cache for the given set of controls, discarding any
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77 * existing cache.
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78 *
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79 * @param controls the controls whose size is being cached
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80 */
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81 private void rebuildCache(Control[] controls) {
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82 SizeCache[] newCache = new SizeCache[controls.length];
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83
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84 for (int idx = 0; idx < controls.length; idx++) {
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85 // Try to reuse existing caches if possible
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86 if (idx < caches.length) {
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87 newCache[idx] = caches[idx];
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88 newCache[idx].setControl(controls[idx]);
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89 } else {
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90 newCache[idx] = new SizeCache(controls[idx]);
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91 }
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92 }
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93
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94 caches = newCache;
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95 }
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96
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97 /**
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98 * Computes the preferred size of the nth control
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99 *
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100 * @param controlIndex index of the control whose size will be computed
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101 * @param widthHint width of the control (or SWT.DEFAULT if unknown)
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102 * @param heightHint height of the control (or SWT.DEFAULT if unknown)
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103 * @return the preferred size of the control
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104 */
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105 public Point computeSize(int controlIndex, int widthHint, int heightHint) {
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106 return caches[controlIndex].computeSize(widthHint, heightHint);
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107 }
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108
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109 /**
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110 * Flushes the cache for the given control. This should be called if exactly
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111 * one of the controls has changed but the remaining controls remain unmodified
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112 *
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113 * @param controlIndex
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114 */
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115 public void flush(int controlIndex) {
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116 caches[controlIndex].flush();
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117 }
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118
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119 /**
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120 * Flushes the cache.
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121 */
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122 public void flush() {
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123 for (int idx = 0; idx < caches.length; idx++) {
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124 caches[idx].flush();
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125 }
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126 }
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127 }