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annotate dwt/widgets/Layout.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | 2952d5604c0a |
rev | line source |
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0
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 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 *******************************************************************************/ |
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11 module dwt.widgets.Layout; |
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12 |
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13 import dwt.dwthelper.utils; |
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14 |
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15 |
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16 import dwt.graphics.Point; |
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17 |
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18 /** |
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19 * A layout controls the position and size |
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20 * of the children of a composite widget. |
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21 * This class is the abstract base class for |
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22 * layouts. |
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23 * |
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24 * @see Composite#setLayout(Layout) |
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25 */ |
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26 public abstract class Layout { |
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27 |
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28 /** |
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29 * Computes and returns the size of the specified |
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30 * composite's client area according to this layout. |
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31 * <p> |
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32 * This method computes the size that the client area |
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33 * of the composite must be in order to position all |
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34 * children at their preferred size inside the |
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35 * composite according to the layout algorithm |
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36 * encoded by this layout. |
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37 * </p> |
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38 * <p> |
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39 * When a width or height hint is supplied, it is |
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40 * used to constrain the result. For example, if a |
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41 * width hint is provided that is less than the |
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42 * width of the client area, the layout may choose |
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43 * to wrap and increase height, clip, overlap, or |
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44 * otherwise constrain the children. |
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45 * </p> |
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46 * |
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47 * @param composite a composite widget using this layout |
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48 * @param wHint width (<code>DWT.DEFAULT</code> for preferred size) |
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49 * @param hHint height (<code>DWT.DEFAULT</code> for preferred size) |
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50 * @param flushCache <code>true</code> means flush cached layout values |
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51 * @return a point containing the computed size (width, height) |
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52 * |
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53 * @see #layout |
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54 * @see Control#getBorderWidth |
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55 * @see Control#getBounds |
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56 * @see Control#getSize |
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57 * @see Control#pack(bool) |
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58 * @see "computeTrim, getClientArea for controls that implement them" |
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59 */ |
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60 protected abstract Point computeSize (Composite composite, int wHint, int hHint, bool flushCache); |
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61 |
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62 /** |
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63 * Instruct the layout to flush any cached values |
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64 * associated with the control specified in the argument |
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65 * <code>control</code>. |
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66 * |
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67 * @param control a control managed by this layout |
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68 * @return true if the Layout has flushed all cached information associated with control |
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69 * |
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70 * @since 3.1 |
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71 */ |
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72 protected bool flushCache (Control control) { |
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73 return false; |
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74 } |
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75 |
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76 /** |
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77 * Lays out the children of the specified composite |
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78 * according to this layout. |
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79 * <p> |
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80 * This method positions and sizes the children of a |
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81 * composite using the layout algorithm encoded by this |
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82 * layout. Children of the composite are positioned in |
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83 * the client area of the composite. The position of |
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84 * the composite is not altered by this method. |
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85 * </p> |
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86 * <p> |
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87 * When the flush cache hint is true, the layout is |
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88 * instructed to flush any cached values associated |
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89 * with the children. Typically, a layout will cache |
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90 * the preferred sizes of the children to avoid the |
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91 * expense of computing these values each time the |
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92 * widget is laid out. |
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93 * </p> |
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94 * <p> |
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95 * When layout is triggered explicitly by the programmer |
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96 * the flush cache hint is true. When layout is triggered |
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97 * by a resize, either caused by the programmer or by the |
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98 * user, the hint is false. |
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99 * </p> |
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100 * |
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101 * @param composite a composite widget using this layout |
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102 * @param flushCache <code>true</code> means flush cached layout values |
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103 */ |
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104 protected abstract void layout (Composite composite, bool flushCache); |
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105 } |