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comparison 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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96:b492ba44e44d 98:95307ad235d9
1 /*******************************************************************************
2 * Copyright (c) 2000, 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.draw2d.DelegatingLayout;
14
15 import dwt.dwthelper.utils;
16 import dwtx.dwtxhelper.Collection;
17
18 import dwtx.draw2d.geometry.Dimension;
19 import dwtx.draw2d.IFigure;
20 import dwtx.draw2d.AbstractLayout;
21 import dwtx.draw2d.Locator;
22
23 /**
24 * Figures using a DelegatingLayout as their layout manager give
25 * location responsibilities to their children. The children
26 * of a Figure using a DelegatingLayout should have a
27 * {@link Locator Locator} as a constraint whose
28 * {@link Locator#relocate(IFigure target) relocate} method is
29 * responsible for placing the child.
30 */
31 public class DelegatingLayout
32 : AbstractLayout
33 {
34
35 private Map constraints;
36
37 this(){
38 constraints = new HashMap();
39 }
40 /**
41 * Calculates the preferred size of the given Figure.
42 * For the DelegatingLayout, this is the largest width and height
43 * values of the passed Figure's children.
44 *
45 * @param parent the figure whose preferred size is being calculated
46 * @param wHint the width hint
47 * @param hHint the height hint
48 * @return the preferred size
49 * @since 2.0
50 */
51 protected Dimension calculatePreferredSize(IFigure parent, int wHint, int hHint) {
52 List children = parent.getChildren();
53 Dimension d = new Dimension();
54 for (int i = 0; i < children.size(); i++) {
55 IFigure child = cast(IFigure)children.get(i);
56 d.union_(child.getPreferredSize());
57 }
58 return d;
59 }
60
61 /**
62 * @see dwtx.draw2d.LayoutManager#getConstraint(dwtx.draw2d.IFigure)
63 */
64 public Object getConstraint(IFigure child) {
65 return constraints.get(cast(Object)child);
66 }
67
68 /**
69 * Lays out the given figure's children based on their {@link Locator} constraint.
70 * @param parent the figure whose children should be layed out
71 */
72 public void layout(IFigure parent) {
73 List children = parent.getChildren();
74 for (int i = 0; i < children.size(); i++) {
75 IFigure child = cast(IFigure)children.get(i);
76 Locator locator = cast(Locator)constraints.get(cast(Object)child);
77 if (locator !is null) {
78 locator.relocate(child);
79 }
80 }
81 }
82
83 /**
84 * Removes the locator for the given figure.
85 * @param child the child being removed
86 */
87 public void remove(IFigure child) {
88 constraints.remove(cast(Object)child);
89 }
90
91 /**
92 * Sets the constraint for the given figure.
93 * @param figure the figure whose contraint is being set
94 * @param constraint the new constraint
95 */
96 public void setConstraint(IFigure figure, Object constraint) {
97 super.setConstraint(figure, constraint);
98 if (constraint !is null)
99 constraints.put(cast(Object)figure, constraint);
100 }
101
102 }