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annotate mde/gui/widget/Widget.d @ 92:085f2ca31914

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Shared alignments supported in more complex cases.
author Diggory Hardy <diggory.hardy@gmail.com>
date Tue, 21 Oct 2008 09:57:19 +0100
parents 4d5d53e4f881
children 08a4ae11454b
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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15
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16 /*************************************************************************************************
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17 * GUI Widget module.
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18 *
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19 * This module contains some base widget classes suitable for widget classes to inherit. However,
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20 * inheriting one of them is by no means necessary for a widget so long as the IWidget interface
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21 * is implemented.
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22 *************************************************************************************************/
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23 module mde.gui.widget.Widget;
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24
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25 public import mde.gui.widget.Ifaces;
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26 import mde.gui.exception;
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28 debug {
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29 import tango.util.log.Log : Log, Logger;
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30 private Logger logger;
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31 static this () {
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32 logger = Log.getLogger ("mde.gui.widget.Widget");
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33 }
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34 }
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35
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36
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37 /*************************************************************************************************
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38 * An abstract base widget class.
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39 *
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40 * This abstract class, and the more concrete FixedWidget and ScalableWidget classes provides a
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41 * useful basic implementation for widgets. Widgets need not inherit these (they only need
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42 * implement IWidget); they are simply provided for convenience and to promote code reuse.
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43 *************************************************************************************************/
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44 abstract class Widget : IChildWidget
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45 {
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46 //BEGIN Load and save
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47 // Base this() for child Widgets.
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48 this (IWidgetManager mgr, widgetID, WidgetData) {
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49 this.mgr = mgr;
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50 }
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51
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52 // Most widgets don't need this; all initialization os usually done in this()
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53 void prefinalize () {}
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54 void finalize () {}
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55
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56 // ParentWidget is inteded for parent widgets to derive
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57 IChildWidget[] children () {
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58 return null;
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59 }
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61 // Don't save any data: fine for many widgets.
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62 // FIXME: implementation could be added to ParentWidget
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63 bool saveChanges (widgetID) {
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64 return false;
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65 }
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67 // Very basic implementation which assumes the renderer cannot affect the widget's size.
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68 bool rendererChanged () {
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69 return false;
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70 }
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71 //END Load and save
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72
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73 //BEGIN Size and position
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74 bool isWSizable () { return false; }
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75 bool isHSizable () { return false; }
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77 /* Return minimal/fixed size. */
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78 wdim minWidth () {
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79 return mw;
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80 }
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81 wdim minHeight () {
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82 return mh;
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83 }
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84
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85 wdim width () {
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86 return w;
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87 }
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88 wdim height() {
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89 return h;
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90 }
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91
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92 deprecated void getCurrentSize (out wdim cw, out wdim ch) {
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93 cw = w;
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94 ch = h;
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95 }
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96
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97 /* Set size: minimal size is (mw,mh). Note that both resizable and fixed widgets should allow
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98 * enlarging, so in both cases this is a correct implementation. */
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99 void setWidth (wdim nw, int) {
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100 debug if (nw < mw) logger.warn ("Widget width set below minimal size");
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101 w = (nw >= mw ? nw : mw);
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102 }
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103 void setHeight (wdim nh, int) {
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104 debug if (nh < mh) logger.warn ("Widget height set below minimal size");
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105 h = (nh >= mh ? nh : mh);
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106 }
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107
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108 void setPosition (wdim nx, wdim ny) {
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109 x = nx;
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110 y = ny;
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111 }
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112 //END Size and position
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113
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114 //BEGIN Events
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115 /* This method is only called when the location is over this widget; hence for all widgets
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116 * without children this method is valid. */
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117 IChildWidget getWidget (wdim cx, wdim cy) {
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118 debug assert (cx >= x && cx < x + w && cy >= y && cy < y + h, "getWidget: not on widget (code error)");
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119 return this;
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120 }
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121
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122 /* Dummy event method (suitable for all widgets which don't respond to events). */
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123 void clickEvent (wdabs cx, wdabs cy, ubyte b, bool state) {}
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124 //END Events
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125
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126 /* Basic draw method: draw the background (all widgets should do this). */
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127 void draw () {
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128 mgr.renderer.drawWidgetBack (x,y, w,h);
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129 }
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130
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131 protected:
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132 /**********************************************************************************************
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133 * Widgets may use WDCheck as a utility to check what data holds. Its use is encouraged, so
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134 * that the checks can easily be updated should WidgetData be changed.
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135 *
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136 * Params:
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137 * data = the WidgetData to check lengths of
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138 * n_ints = number of integers wanted
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139 * n_strings= number of strings (default 0 since not all widgets use strings)
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140 *********************************************************************************************/
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141 void WDCheck (WidgetData data, size_t n_ints, size_t n_strings = 0) {
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142 if (data.ints.length != n_ints ||
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143 data.strings.length != n_strings)
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144 throw new WidgetDataException (this);
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145 }
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146
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147 IWidgetManager mgr; // the enclosing window
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148 wdim x, y; // position
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149 wdim w, h; // size
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150 wdim mw = 0, mh = 0; // minimal or fixed size, depending on whether the widget is
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151 // resizible; both types of widgets should actually be expandable.
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152 }
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153
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154 /*************************************************************************************************
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155 * An abstract base widget class for parent widgets.
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156 *************************************************************************************************/
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157 abstract class ParentWidget : Widget
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158 {
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159 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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160 super (mgr, id, data);
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161 }
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162
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163 IChildWidget[] children () {
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164 return subWidgets;
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165 }
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166
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167 protected:
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168 IChildWidget[] subWidgets;
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169 }
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170
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171 /** A base for fixed-size widgets taking their size from the creation data. */
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172 class FixedWidget : Widget {
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173 // Check data.length is at least 3 before calling!
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174 /** Constructor for a fixed-size [blank] widget.
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175 *
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176 * Widget uses the initialisation data:
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177 * [widgetID, w, h]
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178 * where w, h is the fixed size. */
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179 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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180 super (mgr, id, data);
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181 mw = cast(wdim) data.ints[1];
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182 mh = cast(wdim) data.ints[2];
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183 w = mw;
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184 h = mh;
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185 }
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186 }
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187
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188 /** A base for resizable widgets. */
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189 class SizableWidget : Widget {
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190 // Check data.length is at least 1 before calling!
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191 /// Constructor for a completely resizable [blank] widget.
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192 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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193 super (mgr, id, data);
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194 }
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195
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196 bool isWSizable () { return true; }
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197 bool isHSizable () { return true; }
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198 }