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annotate dwtx/draw2d/PopUpHelper.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.PopUpHelper;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18
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19 import dwt.DWT;
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20 import dwt.graphics.Color;
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21 import dwt.graphics.Rectangle;
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22 import dwt.widgets.Control;
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23 import dwt.widgets.Shell;
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24 import dwtx.draw2d.geometry.Dimension;
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25 import dwtx.draw2d.LightweightSystem;
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26
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27 /**
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28 * Provides abstract support for classes that manage popups. Popups in Draw2d consist of a
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29 * LightweightSystem object with an DWT shell as its Control. Desired popup behavior is
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30 * attained by adding appropriate listeners to this shell.
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31 */
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32 public abstract class PopUpHelper {
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33
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34 private Shell shell;
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35 private LightweightSystem lws;
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36 private bool tipShowing;
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37 /**
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38 * The Control this PopUpHelper's tooltip will belong to.
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39 */
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40 protected Control control;
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41
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42 /**
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43 * These style bits should be used when creating the Shell.
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44 * @see #createShell()
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45 */
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46 protected const int shellStyle;
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47
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48 /**
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49 * Constructs a PopUpHelper to assist with popups on Control c.
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50 *
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51 * @param c the Control
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52 * @since 2.0
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53 */
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54 protected this(Control c) {
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55 this (c, DWT.ON_TOP | DWT.NO_TRIM);
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56 }
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57
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58 /**
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59 * Constructs a PopUpHelper to display the given shell style popup.
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60 * @param c the control on which the popup is active.
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61 * @param shellStyle the DWT style bits for the shell
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62 * @since 3.1
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63 */
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64 protected this(Control c, int shellStyle) {
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65 control = c;
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66 this.shellStyle = shellStyle | DWT.NO_BACKGROUND | DWT.NO_REDRAW_RESIZE;
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67 }
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68
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69 /**
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70 * Creates and returns the LightweightSystem object used by PopUpHelper to draw upon.
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71 *
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72 * @return the newly created LightweightSystem
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73 * @since 2.0
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74 */
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75 protected LightweightSystem createLightweightSystem() {
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76 return new LightweightSystem();
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77 }
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78
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79 /**
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80 * Creates a new Shell object with the style specified for this helper.
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81 *
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82 * @return the newly created Shell
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83 * @since 2.0
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84 */
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85 protected Shell createShell() {
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86 return new Shell(control.getShell(), shellStyle);
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87 }
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88
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89 /**
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90 * Dispose of this PopUpHelper object.
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91 *
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92 * @since 2.0
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93 */
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94 public void dispose() {
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95 if (isShowing())
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96 hide();
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97 if (shell !is null && !shell.isDisposed())
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98 shell.dispose();
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99 }
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100
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101 /**
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102 * Returns this PopUpHelper's shell. If no shell exists for this PopUpHelper, a new shell
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103 * is created and hookShellListeners() is called.
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104 *
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105 * @return the Shell
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106 * @since 2.0
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107 */
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108 protected Shell getShell() {
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109 if (shell is null) {
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110 shell = createShell();
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111 hookShellListeners();
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112 }
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113 return shell;
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114 }
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115
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116 /**
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117 * Returns the size needed to display the shell's trim. This method should not be called
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118 * until the shell has been created.
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119 * @return the size of the shells trim.
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120 * @since 3.1
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121 */
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122 protected Dimension getShellTrimSize() {
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123 Rectangle trim = shell.computeTrim(0, 0, 0, 0);
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124 return new Dimension(trim.width, trim.height);
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125 }
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126
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127 /**
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128 * Returns this PopUpHelper's LightweightSystem. If no LightweightSystem exists for this
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129 * PopUpHelper, a new LightweightSystem is created with this PopUpHelper's Shell as its
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130 * Control.
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131 *
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132 * @return the LightweightSystem
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133 * @since 2.0
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134 */
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135 protected LightweightSystem getLightweightSystem() {
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136 if (lws is null) {
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137 lws = createLightweightSystem();
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138 lws.setControl(getShell());
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139 }
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140 return lws;
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141 }
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142
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143 /**
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144 * Hides this PopUpHelper's Shell.
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145 *
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146 * @since 2.0
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147 */
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148 protected void hide() {
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149 if (shell !is null && !shell.isDisposed())
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150 shell.setVisible(false);
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151 tipShowing = false;
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152 }
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153
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154 /**
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155 * Desired popup helper behavior is achieved by writing listeners that manipulate the
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156 * behavior of the PopUpHelper's Shell. Override this method and add these listeners here.
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157 *
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158 * @since 2.0
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159 */
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160 protected abstract void hookShellListeners();
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161
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162 /**
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163 * Returns <code>true</code> if this PopUpHelper's Shell is visible, <code>false</code>
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164 * otherwise.
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165 *
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166 * @return <code>true</code> if this PopUpHelper's Shell is visible
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167 * @since 2.0
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168 */
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169 public bool isShowing() {
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170 return tipShowing;
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171 }
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172
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173 /**
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174 * Sets the background color of this PopUpHelper's Shell.
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175 *
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176 * @param c the new background color
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177 * @since 2.0
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178 */
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179 public void setBackgroundColor(Color c) {
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180 getShell().setBackground(c);
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181 }
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182
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183 /**
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184 * Sets the foreground color of this PopUpHelper's Shell.
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185 *
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186 * @param c the new foreground color
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187 * @since 2.0
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188 */
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189 public void setForegroundColor(Color c) {
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190 getShell().setForeground(c);
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191 }
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192
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193 /**
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194 * Sets the bounds on this PopUpHelper's Shell.
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195 *
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196 * @param x the x coordinate
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197 * @param y the y coordinate
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198 * @param width the width
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199 * @param height the height
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200 * @since 2.0
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201 */
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202 protected void setShellBounds(int x, int y, int width, int height) {
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203 getShell().setBounds(x, y, width, height);
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204 }
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205
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206 /**
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207 * Displays this PopUpHelper's Shell.
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208 *
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209 * @since 2.0
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210 */
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211 protected void show() {
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212 getShell().setVisible(true);
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213 tipShowing = true;
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214 }
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215
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216 }