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annotate mde/gui/widget/Widget.d @ 34:6b4116e6355c

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Work on the Gui: some of the framework for drag & drop. Also made Window an IWidget. Implemented getWidget(x,y) to find the widget under this location for IWidgets (but not Gui). Made Window an IWidget and made it work a little more similarly to widgets. Implemented callbacks on the Gui for mouse events (enabling drag & drop, etc.). committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 02 May 2008 16:03:52 +0100
parents 316b0230a849
children 57d000574d75
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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 /// GUI Widget module.
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17 module mde.gui.widget.Widget;
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18
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19 public import mde.gui.widget.Ifaces;
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20 import mde.gui.IGui;
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21 import mde.gui.exception;
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22
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23 import gl = mde.gl.basic;
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24
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25 import tango.io.Stdout;
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26
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27 /** A base widget class. Widgets need not inherit this (they only need implement IWidget), but this
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28 * class provides a useful basic implementation for widgets.
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29 *
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30 * Do not use directly (i.e. only for inheriting from).
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31 */
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32 class Widget : IWidget
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33 {
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34 /** Minimum size is zero. */
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35 void getMinimumSize (out int w, out int h) {} // w,h initialised to 0
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36 /** Current size. */
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37 void getCurrentSize (out int w, out int h) {
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38 w = this.w;
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39 h = this.h;
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40 }
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41
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42 void setPosition (int x, int y) {
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43 this.x = x;
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44 this.y = y;
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45 }
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46
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47 /** Return self, since we don't have child widgets and the method wouldn't have been called
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48 * unless the location was over us. Valid for all widgets without children. */
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49 IWidget getWidget (int,int) {
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50 return this;
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51 }
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52
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53 /** Dummy event method (widget doesn't respond to events) */
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54 void clickEvent (ushort cx, ushort cy, ubyte b, bool state) {}
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55
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56 /** Basic draw method: draw the background (all widgets should do this) */
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57 void draw () {
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58 window.renderer.drawWidgetBack (x,y, w,h);
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59 }
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60
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61 protected:
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62 IWindow window; // the enclosing window
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63 int x, y; // position
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64 int w, h; // size
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65 }
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66
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67 //BEGIN Widgets
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68 /// Draws a box. That's it.
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69 class BoxWidget : Widget
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70 {
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71 this (IWindow wind, IWidget, int[] data) {
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72 if (data.length != 2) throw new WidgetDataException;
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73
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74 window = wind;
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75
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76 w = data[0];
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77 h = data[1];
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78 }
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79 void draw () {
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80 gl.setColor(1f,0f,0f);
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81 window.renderer.drawBox (x,y, w,h);
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82 }
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83 }
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84
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85 /// First interactible widget
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86 class ButtonWidget : Widget
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87 {
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88 bool pushed = false; // true if button is pushed in (visually)
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89 // pushed is not the same as the button being clicked but not yet released.
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90 // it is whether the mouse is over the button after being clicked.
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91
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92 this (IWindow wind, IWidget, int[] data) {
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93 if (data.length != 2) throw new WidgetDataException;
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94
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95 window = wind;
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96
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97 w = data[0];
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98 h = data[1];
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99 }
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100
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101 void draw () {
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102 if (pushed)
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103 gl.setColor (1f, 0f, 1f);
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104 else
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105 gl.setColor (.6f, 0f, .6f);
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106 window.renderer.drawBox (x,y, w,h);
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107 }
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108
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109 void getMinimumSize (out int w, out int h) {
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110 w = this.w; // button is not resizable
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111 h = this.h;
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112 }
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113
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114 void clickEvent (ushort, ushort, ubyte b, bool state) {
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115 if (b == 1 && state == true) {
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116 pushed = true;
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117 window.gui.addClickCallback (&clickWhileHeld);
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118 window.gui.addMotionCallback (&motionWhileHeld);
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119 }
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120 }
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121 // Called when a mouse motion/click event occurs while (held == true)
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122 void clickWhileHeld (ushort cx, ushort cy, ubyte b, bool state) {
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123 if (cx >= x && cx < x+w && cy >= y && cy < y+h) // button event
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124 Stdout ("Button clicked!").newline;
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125
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126 pushed = false;
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127 window.gui.removeCallbacks (cast(void*) this);
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128 }
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129 void motionWhileHeld (ushort cx, ushort cy) {
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130 if (cx >= x && cx < x+w && cy >= y && cy < y+h) pushed = true;
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131 else pushed = false;
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132 }
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133 }
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134 //END Widgets