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annotate mde/gui/widget/Widget.d @ 77:3dfd934100f7

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Continuing widget data changes started in last commit: all previous widgets work again now (but lacking saving).
author Diggory Hardy <diggory.hardy@gmail.com>
date Tue, 29 Jul 2008 17:11:22 +0100
parents 65780e0e48e6
children 79a1809421aa
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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.renderer.IRenderer;
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27 import mde.gui.exception;
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29
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30 /*************************************************************************************************
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31 * Widgets may use WDCheck as a utility to check what data holds. Its use is encouraged, so that
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32 * the checks can easily be updated should WidgetData be changed.
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33 *
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34 * Params:
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35 * data = the WidgetData to check lengths of
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36 * n_ints = number of integers wanted
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37 * n_strings= number of strings (default 0 since not all widgets use strings)
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38 *************************************************************************************************/
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39 void WDCheck (WidgetData data, size_t n_ints, size_t n_strings = 0) {
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40 if (data.ints.length != n_ints ||
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41 data.strings.length != n_strings)
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42 throw new WidgetDataException;
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43 }
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44
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45
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46 /*************************************************************************************************
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47 * An abstract base widget class.
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48 *
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49 * This abstract class, and the more concrete FixedWidget and ScalableWidget classes provides a
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50 * useful basic implementation for widgets. Widgets need not inherit these (they only need
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51 * implement IWidget); they are simply provided for convenience and to promote code reuse.
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52 *************************************************************************************************/
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53 abstract class Widget : IChildWidget
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54 {
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55 //BEGIN Load and save
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56 // Base this() for child Widgets.
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57 this (IWidgetManager mgr, WidgetData data) {
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58 this.mgr = mgr;
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59 }
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60
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61 // Very basic implementation which assumes the renderer cannot affect the widget's size.
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62 bool rendererChanged () {
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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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70
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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 deprecated void getCurrentSize (out wdim cw, out wdim ch) {
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80 cw = w;
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81 ch = h;
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82 }
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83
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84 /* Set size: minimal size is (mw,mh). Note that both resizable and fixed widgets should allow
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85 * enlarging, so in both cases this is a correct implementation. */
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86 void setWidth (wdim nw, int) {
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87 w = (nw >= mw ? nw : mw);
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88 }
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89 void setHeight (wdim nh, int) {
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90 h = (nh >= mh ? nh : mh);
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91 }
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92
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93 void setPosition (wdim nx, wdim ny) {
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94 x = nx;
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95 y = ny;
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96 }
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97 //END Size and position
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98
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99 //BEGIN Events
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100 /* This method is only called when the location is over this widget; hence for all widgets
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101 * without children this method is valid. */
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102 IChildWidget getWidget (wdim,wdim) {
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103 return this;
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104 }
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105
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106 /* Dummy event method (suitable for all widgets which don't respond to events). */
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107 void clickEvent (wdabs cx, wdabs cy, ubyte b, bool state) {}
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108 //END Events
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109
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110 /* Basic draw method: draw the background (all widgets should do this). */
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111 void draw () {
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112 mgr.renderer.drawWidgetBack (x,y, w,h);
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113 }
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114
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115 protected:
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116 IWidgetManager mgr; // the enclosing window
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117 wdim x, y; // position
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118 wdim w, h; // size
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119 wdim mw = 0, mh = 0; // minimal or fixed size, depending on whether the widget is
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120 // resizible; both types of widgets should actually be expandable.
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121 }
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122
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123 /** A base for fixed-size widgets taking their size from the creation data. */
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124 class FixedWidget : Widget {
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125 // Check data.length is at least 3 before calling!
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126 /** Constructor for a fixed-size [blank] widget.
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127 *
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128 * Widget uses the initialisation data:
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129 * [widgetID, w, h]
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130 * where w, h is the fixed size. */
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131 this (IWidgetManager mgr, WidgetData data) {
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132 super (mgr, data);
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133 mw = cast(wdim) data.ints[1];
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134 mh = cast(wdim) data.ints[2];
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135 w = mw;
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136 h = mh;
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137 }
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138 }
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139
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140 /** A base for resizable widgets. */
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141 class SizableWidget : Widget {
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142 // Check data.length is at least 1 before calling!
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143 /// Constructor for a completely resizable [blank] widget.
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144 this (IWidgetManager mgr, WidgetData data) {
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145 super (mgr, data);
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146 }
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147
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148 bool isWSizable () { return true; }
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149 bool isHSizable () { return true; }
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150 }