Mercurial > projects > mde
annotate mde/gui/widget/Ifaces.d @ 96:dbf332403c6e
Improvements to FloatingAreaWidget: positioning, passing click events and draw order.
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Thu, 06 Nov 2008 13:16:39 +0000 |
parents | 2a364c7d82c9 |
children | 5de5810e3516 |
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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 * Widget interfaces. |
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18 * |
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19 * Widgets are connected as the nodes of a tree. Widgets know their parent as a IParentWidget |
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20 * class and their children as IChildWidget classes. The gui manager is a special widget only |
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21 * implementing IParentWidget; all other widgets must implement IChildWidget and optionally |
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22 * IParentWidget. |
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23 *************************************************************************************************/ |
32
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24 module mde.gui.widget.Ifaces; |
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25 |
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26 public import mde.gui.types; |
32
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27 public import mde.gui.renderer.IRenderer; |
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28 import mde.gui.content.Content; //NOTE - maybe move IContent to a separate module |
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29 |
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30 |
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31 /************************************************************************************************* |
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32 * Common interface for all widgets. |
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33 * |
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34 * Notation: |
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35 * Positive/negative direction: along the x/y axis in this direction. |
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36 * Layout widget: a widget containing multiple sub-widges (which hence controls how they are |
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37 * laid out). |
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38 *************************************************************************************************/ |
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39 //NOTE: keep this? |
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40 interface IWidget |
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41 { |
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42 } |
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43 |
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44 |
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45 /************************************************************************************************* |
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46 * Interface for the widget manager. |
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47 * |
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48 * This class handles widget rendering, input, loading and saving. |
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49 *************************************************************************************************/ |
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50 interface IWidgetManager : IWidget |
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51 { |
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52 // Loading/saving: |
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53 /** Create a widget by ID. |
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54 * |
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55 * Params: |
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56 * id = Identifier, within data files, of the data for the widget. |
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57 * content = An IContent may be passed to some widgets on creation. |
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58 * |
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59 * Creates a widget, using the widget data with index id. Widget data is loaded from files, |
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60 * and per design (multiple gui layouts, called designs, may exist; data is per design). |
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61 */ |
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62 IChildWidget makeWidget (widgetID id, IContent content = null); |
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63 |
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64 /// Get dimensional data. |
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65 wdims dimData (widgetID id); |
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66 |
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67 /** Record some changes, for saving. Should only be called from IWidget.saveChanges() to avoid |
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68 * multiple calls for instanced widgets of same id. |
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69 * |
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70 * WidgetData is for most data, dimensional data (wdims) is for dimensions. */ |
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71 void setData (widgetID id, WidgetData); |
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72 void setDimData (widgetID id, wdims d); /// ditto |
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73 |
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74 // Rendering: |
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75 /** For when a widget needs redrawing. |
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76 * |
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77 * Must be called because rendering may only be done on events. |
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78 * |
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79 * Currently it just causes everything to be redrawn next frame. */ |
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80 void requestRedraw (); |
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81 |
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82 /** Get the window's renderer. |
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83 * |
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84 * Normally specific to the GUI, but widgets have no direct contact with the GUI and this |
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85 * provides the possibility of per-window renderers (if desired). */ |
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86 IRenderer renderer (); |
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87 |
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88 |
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89 // User input: |
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90 /** Add a mouse click callback. |
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91 * |
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92 * This is a delegate this will be called for all mouse click events recieved by the gui, not |
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93 * simply all click events on the widget (as clickEvent recieves). |
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94 * |
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95 * The delegate should return true if it accepts the event and no further processing is |
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96 * required (i.e. the event should not be handled by anything else), false otherwise. |
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97 * |
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98 * Note that this is not a mechanism to prevent unwanted event handling, and in the future |
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99 * may be removed (so event handling cannot be cut short). */ |
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100 void addClickCallback (bool delegate (wdabs cx, wdabs cy, ubyte b, bool state) dg); |
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101 |
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102 /** Add a mouse motion callback: delegate will be called for all motion events recieved by the |
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103 * gui. */ |
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104 void addMotionCallback (void delegate (wdabs cx, wdabs cy) dg); |
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105 |
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106 // FIXME: keyboard callback (letter only, for text input? Also used for setting keybindings though...) |
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107 |
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108 /** Remove all event callbacks on this widget (according to the delegate's .ptr). */ |
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109 // Note: don't try to pass a reference and cast to void* in the function; it's a different address. |
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110 void removeCallbacks (void* frame); |
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111 } |
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112 |
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113 |
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114 /************************************************************************************************* |
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115 * Interface for (child) widgets, i.e. all widgets other than the manager. |
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116 * |
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117 * A widget is a region of a GUI window which handles rendering and user-interaction for itself |
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118 * and is able to communicate with its manager and child widgets as necessary. (Passing widgets |
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119 * a reference to their parent has not been found useful.) |
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120 * |
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121 * If a widget is to be creatable by IWidgetManager.makeWidget, it must be listed in the |
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122 * createWidget module, and have a constructor of the following form. It should also update it's |
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123 * creation data if necessary, either when changed or when saveChanges() is called, using |
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124 * IWidgetManager.setData(). |
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125 * It should use Ddoc to explain what initialization data is used. |
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126 * ---------------------------------- |
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127 * /++ Constructor for a ... widget. |
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128 * + |
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129 * + Widget uses the initialisation data: |
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130 * + [widgetID, x, y] |
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131 * + where x is ... and y is ... +/ |
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132 * this (IWidgetManager mgr, WidgetData data); |
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133 * |
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134 * /// The CTOR may take an IContent reference: |
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135 * this (IWidgetManager mgr, WidgetData data, IContent content); |
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136 * ---------------------------------- |
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137 * Where mgr is the widget manager and data is |
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138 * initialisation data. The method should throw a WidgetDataException (created without |
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139 * parameters) if the data has wrong length or is otherwise invalid. |
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140 * |
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141 * All widgets should set their own size in this() or finalize(), although some parents may set |
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142 * child-widgets' size during their creation. Widgets may rely on setPosition() being called after |
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143 * finalize(). |
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144 * |
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145 * Also see finalize(). |
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146 *************************************************************************************************/ |
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147 //NOTE: add another this() without the data for default initialization, for the GUI editor? |
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148 interface IChildWidget : IWidget |
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149 { |
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150 //BEGIN Load and save |
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151 // NOTE - change? |
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152 /** Called on all widgets after all widgets have been created in a deepest first order. |
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153 * |
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154 * finalize must be called before any other methods on the widget, which means this() cannot |
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155 * call sub-widgets' methods, but finalize() can. */ |
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156 void prefinalize (); |
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157 void finalize (); /// ditto |
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158 |
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159 /** Widget should return a list of all its children. */ |
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160 IChildWidget[] children (); |
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161 |
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162 /** When this is called, if the widget has any changed data to save it should call |
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163 * IWidgetManager.setData (id, data) to set it and return true. Otherwise it should return |
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164 * false. |
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165 * |
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166 * If the widget has subwidgets, it should also be recursively called on these (passing their |
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167 * ids). */ |
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168 bool saveChanges (); |
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169 |
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170 /** Called when the renderer is changed (at least when the changes affect dimensions). |
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171 * Also called after widget creation, before any other methods are called. |
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172 * |
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173 * Returns: true when widget's dimensions (may) have changed. |
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174 * |
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175 * Should be propegated down to all child widgets. */ |
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176 bool rendererChanged (); |
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177 |
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178 /+ Use when widget editing is available? Requires widgets to know their parents. |
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179 /** Called when a child widget's size has changed. |
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180 * |
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181 * Should be propegated up to parents. */ |
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182 void childChanged (); |
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183 +/ |
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184 //END Load and save |
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185 |
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186 //BEGIN Size and position |
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187 /** Is the width / height resizable? |
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188 * |
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189 * This really means does the widget benifit from being enlarged? Any widget should occupy |
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190 * additional area when expanded. |
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191 * |
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192 * If not, the widget has fixed dimensions equal to it's minimal size. */ |
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193 bool isWSizable (); |
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194 bool isHSizable (); /// ditto |
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195 |
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196 /** The minimal size the widget could be shrunk to (or its fixed size). |
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197 * |
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198 * Takes into account child-widgets and any other contents. */ |
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199 wdim minWidth (); |
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200 wdim minHeight (); /// ditto |
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201 |
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202 /** Get the current size of the widget. */ |
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203 wdim width (); |
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204 wdim height(); /// ditto |
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205 |
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206 /** Used to adjust the size. |
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207 * |
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208 * Params: |
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209 * nw/nh = The new width/height |
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210 * dir = Direction to resize from. This is only really applicable to layout widgets. |
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211 * It must be either -1 (start resizing from highest row/col index, decreasing the |
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212 * index as necessary), or +1 (resize from the lowest index, i.e. 0). |
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213 * Most widgets can simply ignore it. |
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214 * |
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215 * A widget should never be resized smaller than it's minimal size (if it is, it should assume |
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216 * it's minimal size and print a warning when in debug mode). |
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217 * A "fixed" size widget should enlarge itself as requested. |
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218 * |
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219 * setPosition must be called after calling either setWidth or setHeight. */ |
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220 void setWidth (wdim nw, int dir); |
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221 void setHeight (wdim nh, int dir); /// ditto |
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222 |
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223 /** Set the current position (i.e. called on init and move). */ |
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224 void setPosition (wdim x, wdim y); |
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225 //END Size and position |
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226 |
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227 //BEGIN Events |
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228 /** Recursively scan the widget tree to find the widget under (x,y). |
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229 * |
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230 * If called on a widget, that widget should assume the location is over itself, and so should |
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231 * either return itself or the result of calling getWidget on the appropriate child widget. |
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232 * |
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233 * In the case of Window this may not be the case; it should check and return null if not under |
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234 * (x,y). |
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235 * |
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236 * Note: use global coordinates (x,y) not coordinates relative to the widget. */ |
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237 IChildWidget getWidget (wdim x, wdim y); |
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238 |
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239 /** Receive a mouse click event. |
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240 * |
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241 * See mde.input.input.Input.MouseClickCallback for parameters. However, cx and cy are adjusted |
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242 * to the Widget's local coordinates. |
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243 * |
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244 * Widget may assume coordinates are on the widget (caller must check). */ |
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245 void clickEvent (wdabs cx, wdabs cy, ubyte b, bool state); |
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246 //END Events |
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247 |
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248 /** Draw, using the stored values of x and y. |
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249 * |
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250 * Maybe later enforce clipping of all sub-widget drawing, particularly for cases where only |
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251 * part of the widget is visible: scroll bars or a hidden window. */ |
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252 void draw (); |
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253 } |