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annotate dwtx/draw2d/FreeformViewport.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.FreeformViewport;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Dimension;
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18 import dwtx.draw2d.geometry.Rectangle;
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19 import dwtx.draw2d.Viewport;
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20 import dwtx.draw2d.ViewportLayout;
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21 import dwtx.draw2d.IFigure;
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22 import dwtx.draw2d.FreeformFigure;
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23
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24 /**
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25 * A viewport for {@link dwtx.draw2d.FreeformFigure FreeformFigures}.
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26 * FreeformFigures can only reside in this type of viewport.
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27 */
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28 public class FreeformViewport
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29 : Viewport
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30 {
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31
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32 class FreeformViewportLayout
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33 : ViewportLayout
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34 {
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35 protected Dimension calculatePreferredSize(IFigure parent, int wHint, int hHint) {
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36 getContents().validate();
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37 wHint = Math.max(0, wHint);
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38 hHint = Math.max(0, hHint);
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39 return (cast(FreeformFigure)getContents())
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40 .getFreeformExtent()
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41 .getExpanded(getInsets())
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42 .union_(0, 0)
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43 .union_(wHint - 1, hHint - 1)
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44 .getSize();
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45 }
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46
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47 protected bool isSensitiveHorizontally(IFigure parent) {
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48 return true;
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49 }
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50
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51 protected bool isSensitiveVertically(IFigure parent) {
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52 return true;
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53 }
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54
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55
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56 public void layout(IFigure figure) {
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57 //Do nothing, contents updates itself.
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58 }
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59 }
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60
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61 /**
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62 * Constructs a new FreeformViewport. This viewport must use graphics translation to
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63 * scroll the FreeformFigures inside of it.
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64 */
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65 public this() {
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66 super(true); //Must use graphics translate to scroll freeforms.
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67 setLayoutManager(new FreeformViewportLayout());
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68 }
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69
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70 /**
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71 * Readjusts the scrollbars. In doing so, it gets the freeform extent of the contents and
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72 * unions this rectangle with this viewport's client area, then sets the contents freeform
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73 * bounds to be this unioned rectangle. Then proceeds to set the scrollbar values based
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74 * on this new information.
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75 * @see Viewport#readjustScrollBars()
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76 */
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77 protected void readjustScrollBars() {
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78 if (getContents() is null)
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79 return;
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80 if (!( null !is cast(FreeformFigure)getContents() ))
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81 return;
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82 FreeformFigure ff = cast(FreeformFigure)getContents();
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83 Rectangle clientArea = getClientArea();
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84 Rectangle bounds = ff.getFreeformExtent().getCopy();
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85 bounds.union_(0, 0, clientArea.width, clientArea.height);
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86 ff.setFreeformBounds(bounds);
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87
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88 getVerticalRangeModel().setAll(bounds.y, clientArea.height, bounds.bottom());
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89 getHorizontalRangeModel().setAll(bounds.x, clientArea.width, bounds.right());
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90 }
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91
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92 /**
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93 * Returns <code>true</code>.
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94 * @see Figure#useLocalCoordinates()
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95 */
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96 protected bool useLocalCoordinates() {
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97 return true;
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98 }
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99
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100 }