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annotate mde/gui/widget/Widget.d @ 111:1655693702fc

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Resolved ticket #4, allowing widgets to reload strings and recalculate sizes mid-run. Removed prefinalize and finalize and added setup as the new second initialization phase, which can be re-run.
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 06 Dec 2008 17:41:42 +0000
parents 6acd96f8685f
children fe061009029d
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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 * Abstract widget classes have an 'A' prepended to the name, similar to the 'I' convention for
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24 * interfaces.
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25 *************************************************************************************************/
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26 module mde.gui.widget.Widget;
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28 public import mde.gui.widget.Ifaces;
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29 import mde.gui.exception;
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31 debug {
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32 import tango.util.log.Log : Log, Logger;
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33 private Logger logger;
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34 static this () {
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35 logger = Log.getLogger ("mde.gui.widget.Widget");
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36 }
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37 }
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39
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40 /*************************************************************************************************
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41 * An abstract base widget class.
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42 *
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43 * This abstract class, and the more concrete FixedWidget and ScalableWidget classes provides a
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44 * useful basic implementation for widgets. Widgets need not inherit these (they only need
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45 * implement IWidget); they are simply provided for convenience and to promote code reuse.
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46 *************************************************************************************************/
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47 abstract class AWidget : IChildWidget
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48 {
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49 //BEGIN Load and save
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50 // Base this() for child Widgets.
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51 protected this (IWidgetManager mgr, widgetID id, WidgetData) {
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52 this.mgr = mgr;
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53 this.id = id;
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54 }
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55
111
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56 // Widgets need to do their initialization either in this() or setup().
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57 bool setup (uint,uint) {
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58 return false;
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59 }
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61 // Don't save any data: fine for many widgets.
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62 bool saveChanges () {
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63 return false;
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64 }
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65 //END Load and save
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66
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67 //BEGIN Size and position
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68 bool isWSizable () { return false; }
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69 bool isHSizable () { return false; }
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71 /* Return minimal/fixed size. */
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72 wdim minWidth () {
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73 return mw;
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74 }
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75 wdim minHeight () {
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76 return mh;
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77 }
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78
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79 wdim width () {
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80 return w;
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81 }
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82 wdim height() {
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83 return h;
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84 }
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85
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86 deprecated void getCurrentSize (out wdim cw, out wdim ch) {
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87 cw = w;
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88 ch = h;
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89 }
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90
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91 /* Set size: minimal size is (mw,mh). Note that both resizable and fixed widgets should allow
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92 * enlarging, so in both cases this is a correct implementation. */
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93 void setWidth (wdim nw, int) {
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94 debug if (nw < mw) logger.warn ("Widget width set below minimal size");
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95 w = (nw >= mw ? nw : mw);
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96 }
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97 void setHeight (wdim nh, int) {
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98 debug if (nh < mh) logger.warn ("Widget height set below minimal size");
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99 h = (nh >= mh ? nh : mh);
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100 }
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101
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102 void setPosition (wdim nx, wdim ny) {
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103 x = nx;
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104 y = ny;
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105 }
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106 //END Size and position
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107
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108 //BEGIN Events
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109 /* This method is only called when the location is over this widget; hence for all widgets
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110 * without children this method is valid. */
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111 IChildWidget getWidget (wdim cx, wdim cy) {
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112 debug assert (cx >= x && cx < x + w && cy >= y && cy < y + h, "getWidget: not on widget (code error)");
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113 return this;
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114 }
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115
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116 /* Dummy event method (suitable for all widgets which don't respond to events). */
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117 int clickEvent (wdabs cx, wdabs cy, ubyte b, bool state) {
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118 return 0;
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119 }
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120
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121 /* Dummy functions: suitable for widgets with no text input. */
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122 void keyEvent (ushort, char[]) {}
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123 void keyFocusLost () {}
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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. WDMinCheck is similar,
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135 * but allows more data than required; it is used by some generic content widgets.
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136 *
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137 * Params:
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138 * data = the WidgetData to check lengths of
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139 * n_ints = number of integers wanted
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140 * n_strings= number of strings (default 0 since not all widgets use strings)
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141 *********************************************************************************************/
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142 void WDCheck (WidgetData data, size_t n_ints, size_t n_strings = 0) {
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143 if (data.ints.length != n_ints ||
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144 data.strings.length != n_strings)
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145 throw new WidgetDataException (this);
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146 }
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147 /** ditto */
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148 void WDMinCheck (WidgetData data, size_t n_ints, size_t n_strings = 0) {
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149 if (data.ints.length < n_ints ||
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150 data.strings.length < n_strings)
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151 throw new WidgetDataException (this);
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152 }
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153
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154 widgetID id; // The widget's ID, used for saving data
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155 IWidgetManager mgr; // the enclosing window
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156 wdim x, y; // position
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157 wdim w, h; // size
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158 wdim mw = 0, mh = 0; // minimal or fixed size, depending on whether the widget is
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159 // resizible; both types of widgets should actually be expandable.
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160 }
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161
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162 /*************************************************************************************************
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163 * An abstract base widget class for parent widgets (many parent widgets don't use these methods).
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164 *
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165 * Parent widgets probably need to overload these functions (from AWidget):
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166 * setup, saveChanges, setPosition, getWidget, draw, setWidth and setHeight.
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167 *************************************************************************************************/
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168 abstract class AParentWidget : AWidget
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169 {
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170 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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171 super (mgr, id, data);
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172 }
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173
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174 bool setup (uint n, uint flags) {
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175 bool c = false;
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176 foreach (w; subWidgets)
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177 c |= w.setup (n,flags);
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178 return c;
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179 }
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180
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181 bool saveChanges () {
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182 bool c = false;
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183 foreach (w; subWidgets)
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184 c |= w.saveChanges;
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185 return c;
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186 }
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187
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188 protected:
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189 IChildWidget[] subWidgets;
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190 }
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191
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192 /** A base for fixed-size widgets taking their size from the creation data. */
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193 class FixedWidget : AWidget {
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194 // Check data.length is at least 3 before calling!
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195 /** Constructor for a fixed-size [blank] widget.
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196 *
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197 * Widget uses the initialisation data:
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198 * [widgetID, w, h]
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199 * where w, h is the fixed size. */
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200 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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201 super (mgr, id, data);
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202 w = mw = cast(wdim) data.ints[1];
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203 h = mh = cast(wdim) data.ints[2];
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204 }
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205 }
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206
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207 /** A base for resizable widgets. */
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208 class SizableWidget : AWidget {
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209 // Check data.length is at least 1 before calling!
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210 /// Constructor for a completely resizable [blank] widget.
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211 this (IWidgetManager mgr, widgetID id, WidgetData data) {
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212 super (mgr, id, data);
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213 }
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214
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215 bool isWSizable () { return true; }
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216 bool isHSizable () { return true; }
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217 }
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218
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219 /** For pressable buttons.
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220 *
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221 * Overriding classes should implement this() (setting the size), draw() and activated(). */
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222 abstract class AButtonWidget : AWidget
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223 {
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224 protected this (IWidgetManager mgr, widgetID id, WidgetData data) {
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225 super (mgr, id, data);
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226 }
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227
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228 /// May be over-ridden. Pushed is true if the button has been pushed and not released.
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229 void draw () {
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230 mgr.renderer.drawButton (x,y, w,h, pushed);
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231 }
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232
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233 /// Handles the down-click
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234 int clickEvent (wdabs, wdabs, ubyte b, bool state) {
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235 if (b == 1 && state == true) {
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236 pushed = true;
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237 mgr.requestRedraw;
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238 mgr.addClickCallback (&clickWhilePushed);
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239 mgr.addMotionCallback (&motionWhilePushed);
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240 }
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241 return 0;
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242 }
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243
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244 /// Called when a mouse click event occurs while held; handles up-click
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245 bool clickWhilePushed (wdabs cx, wdabs cy, ubyte b, bool state) {
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246 if (b == 1 && state == false) {
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247 if (cx >= x && cx < x+w && cy >= y && cy < y+h) // button event
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248 activated();
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249
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250 pushed = false;
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251 mgr.requestRedraw;
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252 mgr.removeCallbacks (cast(void*) this);
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253
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254 return true;
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255 }
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256 return false;
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257 }
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258 /// Called when a mouse motion event occurs while held; handles pushing in/out on hover
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259 void motionWhilePushed (wdabs cx, wdabs cy) {
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260 bool oldPushed = pushed;
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261 if (cx >= x && cx < x+w && cy >= y && cy < y+h) pushed = true;
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262 else pushed = false;
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263 if (oldPushed != pushed)
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264 mgr.requestRedraw;
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265 }
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266
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267 /// The action triggered when the button is clicked...
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268 void activated ();
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269
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270 protected:
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271 bool pushed = false; /// True if button is pushed in (visually)
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272 }
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273
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274