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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/AbstractLocator.d @ 104:88652073d1c2

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More work on icu
author Frank Benoit <benoit@tionex.de>
date Sat, 02 May 2009 11:27:24 +0200
parents bc29606a740c
children
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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 org.eclipse.draw2d.AbstractLocator;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.draw2d.geometry.Dimension;
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18 import org.eclipse.draw2d.geometry.Point;
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19 import org.eclipse.draw2d.geometry.Rectangle;
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20 import org.eclipse.draw2d.Locator;
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21 import org.eclipse.draw2d.IFigure;
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22 import org.eclipse.draw2d.PositionConstants;
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23
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24 /**
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25 * Places a figure relative to a point determined by the subclass. The figure may be
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26 * placed in some location relative to the point with a configurable amount of spacing.
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27 */
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28 public abstract class AbstractLocator
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29 : Locator
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30 {
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31
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32 private int relativePosition = PositionConstants.CENTER;
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33 private int gap;
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34
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35 /**
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36 * Creates a new AbstractLocator.
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37 */
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38 public this() { }
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39
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40 /**
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41 * Returns the number of pixels to leave between the figure being located and the
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42 * reference point. Only used if {@link #getRelativePosition()} returns something other
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43 * than {@link PositionConstants#CENTER}.
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44 *
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45 * @return The gap
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46 * @since 2.0
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47 */
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48 public int getGap() {
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49 return gap;
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50 }
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51
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52 /**
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53 * Returns the reference point in absolute coordinates used to calculate the location.
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54 * @return The reference point in absolute coordinates
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55 * @since 2.0
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56 */
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57 protected abstract Point getReferencePoint();
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58
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59 /**
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60 * Recalculate the location of the figure according to its desired position relative to
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61 * the center point.
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62 *
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63 * @param size The size of the figure
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64 * @param center The center point
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65 * @return The new bounds
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66 * @since 2.0
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67 */
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68 protected Rectangle getNewBounds(Dimension size, Point center) {
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69 Rectangle bounds = new Rectangle(center, size);
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70
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71 bounds.x -= bounds.width / 2;
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72 bounds.y -= bounds.height / 2;
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73
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74 int xFactor = 0, yFactor = 0;
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75 int position = getRelativePosition();
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76
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77 if ((position & PositionConstants.NORTH) !is 0)
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78 yFactor = -1;
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79 else if ((position & PositionConstants.SOUTH) !is 0)
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80 yFactor = 1;
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81
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82 if ((position & PositionConstants.WEST) !is 0)
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83 xFactor = -1;
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84 else if ((position & PositionConstants.EAST) !is 0)
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85 xFactor = 1;
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86
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87 bounds.x += xFactor * (bounds.width / 2 + getGap());
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88 bounds.y += yFactor * (bounds.height / 2 + getGap());
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89
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90 return bounds;
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91 }
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92
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93 /**
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94 * Returns the position of the figure with respect to the center point. Possible values
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95 * can be found in {@link PositionConstants} and include CENTER, NORTH, SOUTH, EAST, WEST,
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96 * NORTH_EAST, NORTH_WEST, SOUTH_EAST, or SOUTH_WEST.
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97 *
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98 * @return An int constant representing the relative position
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99 * @since 2.0
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100 */
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101 public int getRelativePosition() {
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102 return relativePosition;
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103 }
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104
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105 /**
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106 * Recalculates the position of the figure and returns the updated bounds.
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107 * @param target The figure to relocate
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108 */
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109 public void relocate(IFigure target) {
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110 Dimension prefSize = target.getPreferredSize();
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111 Point center = getReferencePoint();
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112 target.translateToRelative(center);
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113 target.setBounds(getNewBounds(prefSize, center));
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114 }
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115
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116 /**
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117 * Sets the gap between the reference point and the figure being placed. Only used if
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118 * getRelativePosition() returns something other than {@link PositionConstants#CENTER}.
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119 *
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120 * @param i The gap
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121 * @since 2.0
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122 */
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123 public void setGap(int i) {
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124 gap = i;
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125 }
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126
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127 /**
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128 * Sets the position of the figure with respect to the center point. Possible values can
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129 * be found in {@link PositionConstants} and include CENTER, NORTH, SOUTH, EAST, WEST,
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130 * NORTH_EAST, NORTH_WEST, SOUTH_EAST, or SOUTH_WEST.
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131 *
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132 * @param pos The relative position
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133 * @since 2.0
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134 */
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135 public void setRelativePosition(int pos) {
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136 relativePosition = pos;
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137 }
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138
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139 }