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annotate dwtx/draw2d/DelegatingLayout.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 * 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 dwtx.draw2d.DelegatingLayout;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17
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18 import dwtx.draw2d.geometry.Dimension;
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19 import dwtx.draw2d.IFigure;
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20 import dwtx.draw2d.AbstractLayout;
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21 import dwtx.draw2d.Locator;
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22
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23 /**
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24 * Figures using a DelegatingLayout as their layout manager give
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25 * location responsibilities to their children. The children
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26 * of a Figure using a DelegatingLayout should have a
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27 * {@link Locator Locator} as a constraint whose
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28 * {@link Locator#relocate(IFigure target) relocate} method is
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29 * responsible for placing the child.
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30 */
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31 public class DelegatingLayout
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32 : AbstractLayout
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33 {
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34
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35 private Map constraints;
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36
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37 this(){
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38 constraints = new HashMap();
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39 }
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40 /**
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41 * Calculates the preferred size of the given Figure.
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42 * For the DelegatingLayout, this is the largest width and height
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43 * values of the passed Figure's children.
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44 *
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45 * @param parent the figure whose preferred size is being calculated
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46 * @param wHint the width hint
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47 * @param hHint the height hint
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48 * @return the preferred size
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49 * @since 2.0
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50 */
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51 protected Dimension calculatePreferredSize(IFigure parent, int wHint, int hHint) {
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52 List children = parent.getChildren();
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53 Dimension d = new Dimension();
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54 for (int i = 0; i < children.size(); i++) {
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55 IFigure child = cast(IFigure)children.get(i);
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56 d.union_(child.getPreferredSize());
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57 }
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58 return d;
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59 }
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60
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61 /**
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62 * @see dwtx.draw2d.LayoutManager#getConstraint(dwtx.draw2d.IFigure)
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63 */
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64 public Object getConstraint(IFigure child) {
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65 return constraints.get(cast(Object)child);
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66 }
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67
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68 /**
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69 * Lays out the given figure's children based on their {@link Locator} constraint.
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70 * @param parent the figure whose children should be layed out
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71 */
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72 public void layout(IFigure parent) {
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73 List children = parent.getChildren();
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74 for (int i = 0; i < children.size(); i++) {
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75 IFigure child = cast(IFigure)children.get(i);
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76 Locator locator = cast(Locator)constraints.get(cast(Object)child);
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77 if (locator !is null) {
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78 locator.relocate(child);
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79 }
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80 }
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81 }
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82
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83 /**
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84 * Removes the locator for the given figure.
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85 * @param child the child being removed
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86 */
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87 public void remove(IFigure child) {
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88 constraints.remove(cast(Object)child);
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89 }
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90
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91 /**
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92 * Sets the constraint for the given figure.
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93 * @param figure the figure whose contraint is being set
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94 * @param constraint the new constraint
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95 */
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96 public void setConstraint(IFigure figure, Object constraint) {
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97 super.setConstraint(figure, constraint);
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98 if (constraint !is null)
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99 constraints.put(cast(Object)figure, constraint);
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100 }
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101
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102 }