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annotate mde/gui/widget/Ifaces.d @ 116:5ee69b3ed9c9

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Partial implementation of infinite widget recursion protection; some cleanup. Implemented recursion protection which only allowed unsafe widgets to be instantiated once; realised this was far too restrictive (multiple sibling instances are needed) and a check against parent widgets would be needed. Could be implemented by passing widgets a reference to parents. Removed ButtonWidget aka First interactible widget.
author Diggory Hardy <diggory.hardy@gmail.com>
date Sun, 21 Dec 2008 12:03:50 +0000
parents 1b1e2297e2fc
children aba2dd815a1f
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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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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 *************************************************************************************************/
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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;
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27 public import mde.gui.renderer.IRenderer;
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28 import mde.content.Content;
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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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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 * data = Pass this data to the widget, not data looked up via id.
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58 * content = An IContent may be passed to some widgets on creation.
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59 *
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60 * Creates a widget, using the widget data with index id. Widget data is loaded from files,
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61 * and per design (multiple gui layouts, called designs, may exist; data is per design). */
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62 IChildWidget makeWidget (widgetID id, IContent content = null);
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64 /** Get dimension data for a widget. */
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65 wdims dimData (widgetID id);
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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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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 /** Add/remove a pop-up widget to be drawn.
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89 *
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90 * Place popup as close to x,y as possible, or
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91 * place popup next to parent (usually below). */
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92 void addPopup (IChildWidget parent, IChildWidget popup);
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93 //void removePopup (IChildWidget popup); Possibly useful later.
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95 // User input:
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96 /** Add a mouse click callback.
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97 *
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98 * This is a delegate this will be called for all mouse click events recieved by the gui, not
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99 * simply all click events on the widget (as clickEvent recieves).
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100 *
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101 * The delegate should return true if it accepts the event and no further processing is
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102 * required (i.e. the event should not be handled by anything else), false otherwise. */
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103 void addClickCallback (bool delegate (wdabs cx, wdabs cy, ubyte b, bool state) dg);
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104
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105 /** Add a mouse motion callback: delegate will be called for all motion events recieved by the
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106 * gui. */
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107 void addMotionCallback (void delegate (wdabs cx, wdabs cy) dg);
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109 /** Remove all event callbacks on this widget (according to the delegate's .ptr). */
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110 // Note: don't try to pass a reference and cast to void* in the function; it's a different address.
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111 void removeCallbacks (void* frame);
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112 }
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113
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115 /*************************************************************************************************
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116 * Interface for (child) widgets, i.e. all widgets other than the manager.
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117 *
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118 * A widget is a region of a GUI window which handles rendering and user-interaction for itself
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119 * and is able to communicate with its manager and child widgets as necessary. (Passing widgets
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120 * a reference to their parent has not been found useful.)
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121 *
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122 * If a widget is to be creatable by IWidgetManager.makeWidget, it must be listed in the
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123 * createWidget module, and have a constructor of the following form. It should also update it's
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124 * creation data if necessary, either when changed or when saveChanges() is called, using
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125 * IWidgetManager.setData().
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126 * It should use Ddoc to explain what initialization data is used.
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127 * ----------------------------------
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128 * /++ Constructor for a ... widget.
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129 * +
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130 * + Widget uses the initialisation data:
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131 * + [widgetID, x, y]
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132 * + where x is ... and y is ... +/
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133 * this (IWidgetManager mgr, widgetID id, WidgetData data);
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134 *
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135 * /// The CTOR may take an IContent reference:
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136 * this (IWidgetManager mgr, widgetID id, WidgetData data, IContent content);
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137 * ----------------------------------
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138 * Where mgr is the widget manager, id is the _id passed to makeWidget() and data is
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139 * initialisation data. The method should throw a WidgetDataException (created without
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140 * parameters) if the data has wrong length or is otherwise invalid.
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141 *
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142 * All widgets should set their own size in this() or setup() (must be setup() if it could change),
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143 * although some parents may set child-widgets' size during their creation.
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144 *************************************************************************************************/
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145 //NOTE: add another this() without the data for default initialization, for the GUI editor?
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146 interface IChildWidget : IWidget
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147 {
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148 //BEGIN Load and save
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149 /** 2nd stage of initialization for widgets; also called on some changes.
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150 *
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151 * Widgets should call recursively on their children, redo anything indicated by flags, and
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152 * adjust their size and other cached data dependant on any thing which may have changed.
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153 * Widgets may rely on setPosition being called afterwards.
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154 *
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155 * Params:
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156 * n = Indicates this is the (n+1)-th time the function has been called.
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157 * flags = if (flags & 1) the renderer has been changed,
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158 * if (flags & 2) translation strings are being reloaded.
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159 * These flags are always true on first run.
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160 *
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161 * Returns:
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162 * The method should return true if the dimensions (may) have been changed. This may not be
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163 * the case on the first run (when n == 0)!.
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164 */
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165 bool setup (uint n, uint flags);
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166
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167 /** When this is called, if the widget has any changed data to save it should call
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168 * IWidgetManager.setData (id, data) to set it and return true. Otherwise it should return
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169 * false.
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170 *
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171 * If the widget has subwidgets, it should also be recursively called on these (passing their
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172 * ids). */
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173 bool saveChanges ();
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174
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175 /+ Use when widget editing is available? Requires widgets to know their parents.
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176 /** Called when a child widget's size has changed.
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177 *
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178 * Should be propegated up to parents. */
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179 void childChanged ();
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180 +/
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181
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182 //END Load and save
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183
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184 //BEGIN Size and position
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185 /** Is the width / height resizable?
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186 *
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187 * This really means does the widget benifit from being enlarged? Any widget should occupy
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188 * additional area when expanded.
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189 *
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190 * If not, the widget has fixed dimensions equal to it's minimal size. */
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191 bool isWSizable ();
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192 bool isHSizable (); /// ditto
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193
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194 /** The minimal size the widget could be shrunk to (or its fixed size).
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195 *
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196 * Takes into account child-widgets and any other contents. */
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197 wdim minWidth ();
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198 wdim minHeight (); /// ditto
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199
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200 /** Get the current size of the widget. */
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201 wdim width ();
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202 wdim height(); /// ditto
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203
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204 /** (Smallest) coordinates of widget. */
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205 wdabs xPos ();
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206 wdabs yPos (); /// ditto
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207
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208 /** Used to adjust the size.
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209 *
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210 * Params:
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211 * nw/nh = The new width/height
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212 * dir = Direction to resize from. This is only really applicable to layout widgets.
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213 * It must be either -1 (start resizing from highest row/col index, decreasing the
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214 * index as necessary), or +1 (resize from the lowest index, i.e. 0).
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215 * Most widgets can simply ignore it.
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216 *
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217 * A widget should never be resized smaller than it's minimal size (if it is, it should assume
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218 * it's minimal size and print a warning when in debug mode).
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219 * A "fixed" size widget should enlarge itself as requested.
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220 *
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221 * setPosition must be called after calling either setWidth or setHeight. */
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222 void setWidth (wdim nw, int dir);
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223 void setHeight (wdim nh, int dir); /// ditto
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224
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225 /** Set the current position (called after setup and to move widget). */
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226 void setPosition (wdim x, wdim y);
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227 //END Size and position
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228
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229 //BEGIN Events
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230 /** Recursively scan the widget tree to find the widget under (x,y).
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231 *
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232 * If called on a widget, that widget should assume the location is over itself, and so should
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233 * either return itself or the result of calling getWidget on the appropriate child widget.
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234 *
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235 * In the case of Window this may not be the case; it should check and return null if not under
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236 * (x,y).
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237 *
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238 * Note: use global coordinates (x,y) not coordinates relative to the widget. */
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239 IChildWidget getWidget (wdabs x, wdabs y);
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240
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241 /** Receive a mouse click event at cx,cy from button b (1-5 correspond to L,M,B, wheel up,down)
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242 * which is a down-click if state is true.
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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 *
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246 * The return value has the following flags: 1 to request keyboard input. */
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247 int clickEvent (wdabs cx, wdabs cy, ubyte b, bool state);
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248
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249 /** Receives keyboard events when requested.
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250 *
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251 * Params:
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252 * sym SDLKey key sym, useful for keys with no character code such as arrow keys
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253 * letter The character input, in UTF-8 */
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254 void keyEvent (ushort sym, char[] letter);
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255
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256 /** Called when keyboard input focus is lost. */
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257 void keyFocusLost ();
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258
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259 /** Called when the mouse moves over the button and when it leaves. No need to call
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260 * requestRedraw. */
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261 void highlight (bool state);
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262
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263 /** After adding a pop-up widget with mgr.addPopup(this,popupWidget), when that pop-up closes
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264 * the manager calls requestRedraw, clickEvent if applicable, and then this function. */
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265 void popupRemoved ();
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266 //END Events
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267
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268 /** Draw, using the stored values of x and y.
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269 *
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270 * Maybe later enforce clipping of all sub-widget drawing, particularly for cases where only
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271 * part of the widget is visible: scroll bars or a hidden window. */
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272 void draw ();
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273 }