Mercurial > projects > dwt2
annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/widgets/Layout.d @ 0:6dd524f61e62
add dwt win and basic java stuff
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 02 Mar 2009 14:44:16 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2008 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.swt.widgets.Layout; |
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14 |
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15 |
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16 import org.eclipse.swt.graphics.Point; |
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17 import org.eclipse.swt.widgets.Control; |
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18 import org.eclipse.swt.widgets.Composite; |
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19 |
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20 /** |
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21 * A layout controls the position and size |
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22 * of the children of a composite widget. |
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23 * This class is the abstract base class for |
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24 * layouts. |
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25 * |
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26 * @see Composite#setLayout(Layout) |
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27 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
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28 */ |
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29 public abstract class Layout { |
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30 |
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31 /** |
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32 * Computes and returns the size of the specified |
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33 * composite's client area according to this layout. |
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34 * <p> |
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35 * This method computes the size that the client area |
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36 * of the composite must be in order to position all |
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37 * children at their preferred size inside the |
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38 * composite according to the layout algorithm |
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39 * encoded by this layout. |
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40 * </p> |
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41 * <p> |
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42 * When a width or height hint is supplied, it is |
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43 * used to constrain the result. For example, if a |
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44 * width hint is provided that is less than the |
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45 * width of the client area, the layout may choose |
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46 * to wrap and increase height, clip, overlap, or |
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47 * otherwise constrain the children. |
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48 * </p> |
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49 * |
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50 * @param composite a composite widget using this layout |
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51 * @param wHint width (<code>SWT.DEFAULT</code> for preferred size) |
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52 * @param hHint height (<code>SWT.DEFAULT</code> for preferred size) |
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53 * @param flushCache <code>true</code> means flush cached layout values |
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54 * @return a point containing the computed size (width, height) |
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55 * |
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56 * @see #layout |
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57 * @see Control#getBorderWidth |
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58 * @see Control#getBounds |
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59 * @see Control#getSize |
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60 * @see Control#pack(boolean) |
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61 * @see "computeTrim, getClientArea for controls that implement them" |
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62 */ |
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63 abstract Point computeSize (Composite composite, int wHint, int hHint, bool flushCache); |
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64 |
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65 /** |
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66 * Instruct the layout to flush any cached values |
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67 * associated with the control specified in the argument |
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68 * <code>control</code>. |
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69 * |
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70 * @param control a control managed by this layout |
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71 * @return true if the Layout has flushed all cached information associated with control |
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72 * |
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73 * @since 3.1 |
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74 */ |
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75 bool flushCache (Control control) { |
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76 return false; |
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77 } |
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78 |
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79 /** |
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80 * Lays out the children of the specified composite |
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81 * according to this layout. |
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82 * <p> |
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83 * This method positions and sizes the children of a |
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84 * composite using the layout algorithm encoded by this |
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85 * layout. Children of the composite are positioned in |
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86 * the client area of the composite. The position of |
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87 * the composite is not altered by this method. |
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88 * </p> |
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89 * <p> |
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90 * When the flush cache hint is true, the layout is |
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91 * instructed to flush any cached values associated |
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92 * with the children. Typically, a layout will cache |
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93 * the preferred sizes of the children to avoid the |
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94 * expense of computing these values each time the |
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95 * widget is laid out. |
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96 * </p> |
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97 * <p> |
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98 * When layout is triggered explicitly by the programmer |
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99 * the flush cache hint is true. When layout is triggered |
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100 * by a resize, either caused by the programmer or by the |
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101 * user, the hint is false. |
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102 * </p> |
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103 * |
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104 * @param composite a composite widget using this layout |
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105 * @param flushCache <code>true</code> means flush cached layout values |
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106 */ |
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107 abstract void layout (Composite composite, bool flushCache); |
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108 } |