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annotate mde/gui/widget/Ifaces.d @ 39:5132301e9ed7

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Implemented widget saving. Widget creation data saving (sub-widgets, etc:) code there but not used. Widget mutable data saving & loading: window size/position, row/column dimensions saved (still needs a fix in GridWidget.setSize()). committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Wed, 07 May 2008 13:07:03 +0100
parents 052df9b2fe07
children b28d7adc786b
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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 /** Window and widget interfaces. */
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17 module mde.gui.widget.Ifaces;
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18
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19 public import mde.gui.renderer.IRenderer;
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20 import mde.gui.IGui;
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21
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22 /** Interface for Window, allowing widgets to call some of Window's methods.
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23 *
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24 * Contains the methods in Window available for widgets to call on their root. */
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25 interface IWindow : IWidget
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26 {
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27 /** Widget ID type. Each ID is unique under this window.
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28 *
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29 * Type is int since this is the widget data type. */
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30 alias int widgetID;
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31
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32 /** Get a widget by ID.
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33 *
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34 * Returns the widget with the given ID from the Window's widget list. If the widget hasn't yet
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35 * been created, creates it using the Window's widget creation data. */
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36 IWidget makeWidget (widgetID i);
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37
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38 /** Add widget's saveData to the data to be saved, returning it's widgetID. */
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39 widgetID addCreationData (IWidget widget);
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41 /** Get the managing Gui. */
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42 //FIXME: remove and add requestRedraw to allow for only redrawing the window
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43 IGui gui ();
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44
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45 /** Get the window's renderer.
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46 *
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47 * Normally specific to the GUI, but widgets have no direct contact with the GUI and this
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48 * provides the possibility of per-window renderers (if desired). */
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49 IRenderer renderer ();
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50 }
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51
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52 /** Interface for widgets.
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53 *
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54 * Note that Window also implements this interface so that widgets can interact with their parent
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55 * in a uniform way.
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56 *
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57 * A widget is a region of a GUI window which handles rendering and user-interaction for itself
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58 * and is able to communicate with it's window and parent/child widgets as necessary.
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59 *
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60 * A widget's constructor should have this prototype:
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61 * ----------------------------------
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62 * this (IWindow window, int[] data);
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63 * ----------------------------------
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64 * Where window is the root window (the window to which the widget belongs) and data is an array of
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65 * initialisation data. The method should throw a WidgetDataException (created without parameters)
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66 * if the data has wrong length or is otherwise invalid.
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67 *
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68 * The widget's size should be set either by it's this() method or by the first call to
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69 * setSize(). setSize() is called on all widgets immediately after their creation, and throwing an
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70 * exception at this point (but not on later calls to setSize) is an acceptible method of failure.
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71 */
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72 //NOTE: add another this() without the data for default initialization, for the GUI editor?
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73 interface IWidget
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74 {
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75 //BEGIN Load and save
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76 /** Called after creating widgets to adjust size & other mutable attributes from saved data.
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77 *
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78 * Each widget should call adjust on each of its sub-widgets in turn with data, each time
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79 * replacing data by the return value of the call. It should then take its own mutable data
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80 * from the beginning of the array and return the remainder of the array.
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81 *
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82 * Throws: on error, throw a MutableDataException. */
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83 int[] adjust (int[] data);
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84
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85 /** Output data suitible for recreating the widget (data to be passed to this()). */
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86 int[] getCreationData ();
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87
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88 /** Output data containing the widget's current adjustments (data to be passed to adjust()).
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89 * Should be a concatenation of each sub-widget's mutable data and the widget's own. */
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90 int[] getMutableData ();
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91 //END Load and save
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92
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93 //BEGIN Size and position
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94 /** is the width / height resizable?
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95 *
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96 * If not, the widget has fixed dimensions equal the output of getMinimalSize. */
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97 bool isWSizable ();
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98 bool isHSizable (); /// ditto
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99
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100 /** Calculate the minimal size the widget could be shrunk to, taking into account
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101 * child-widgets. */
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102 void getMinimalSize (out int w, out int h);
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103
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104 /** Get the current size of the widget. */
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105 void getCurrentSize (out int w, out int h);
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106
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107 /** Used to adjust the size.
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108 *
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109 * setPosition should always be called after setSize (for layout widgets). Adding this
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110 * restriction appears to be the most efficient approach without a lot more tests.
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111 *
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112 * Implementation:
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113 * The size should be clamped to the widget's minimal size, i.e. the size set may be larger
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114 * than that given by the parameters. Conversely, the size should not be reduced to the
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115 * widget's maximal size (if any) but expanded as necessary (alignment to be implemented).
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116 *
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117 * If the actual size is needed, call getCurrentSize afterwards. */
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118 void setSize (int w, int h);
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119
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120 /** Set the current position (i.e. called on init and move). */
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121 void setPosition (int x, int y);
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122 //END Size and position
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123
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124 //BEGIN Events
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125 /** Recursively scan the widget tree to find the widget under (x,y).
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126 *
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127 * If called on a widget, that widget should assume the location is over itself, and so should
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128 * either return itself or the result of calling getWidget on the appropriate child widget.
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129 *
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130 * In the case of Window this may not be the case; it should check and return null if not under
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131 * (x,y).
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132 *
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133 * Note: use global coordinates (x,y) not coordinates relative to the widget. */
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134 IWidget getWidget (int x, int y);
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135
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136 /** Receive a mouse click event.
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137 *
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138 * See mde.input.input.Input.MouseClickCallback for parameters. However, cx and cy are adjusted
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139 * to the Widget's local coordinates.
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140 *
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141 * Widget may assume coordinates are on the widget (caller must check). */
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142 void clickEvent (ushort cx, ushort cy, ubyte b, bool state);
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143 //END Events
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144
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145 /** Draw, using the stored values of x and y.
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146 *
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147 * Maybe later enforce clipping of all sub-widget drawing, particularly for cases where only
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148 * part of the widget is visible: scroll bars or a hidden window. */
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149 void draw ();
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150 }