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annotate mde/gui/widget/layout.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 052df9b2fe07
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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 layout widgets.
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17 module mde.gui.widget.layout;
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18
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19 import mde.gui.widget.Widget;
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20 import mde.gui.exception : WidgetDataException;
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21
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22 /// Encapsulates a grid of Widgets
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23 class GridWidget : Widget
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24 {
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25 this (IWindow wind, IWidget, int[] data) {
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26 // Get grid size
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27 if (data.length < 2) throw new WidgetDataException;
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28 rows = data[0];
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29 cols = data[1];
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30
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31 window = wind;
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33 // Get all sub-widgets
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34 // Check: correct data length and rows*cols >= 0 (know data.length - 2 >= 0).
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35 if (data.length != 2 + rows * cols) throw new WidgetDataException;
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36 subWidgets.length = rows*cols;
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37 foreach (i, inout subWidget; subWidgets) {
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38 subWidget = window.makeWidget (data[i+2], this);
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39 }
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40
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41 getMinimumSize (w,h); // Calculate the size (current size is not saved)
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42 }
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43
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44 // Calculates from all rows and columns of widgets.
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45 void getMinimumSize (out int w, out int h) {
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46 if (rows*cols == 0) { // special case
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47 w = h = 0;
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48 return;
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49 }
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50
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51 // Find the sizes of all subWidgets
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52 int[] widgetW = new int[subWidgets.length]; // dimensions
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53 int[] widgetH = new int[subWidgets.length];
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54 foreach (i,widget; subWidgets) widget.getCurrentSize (widgetW[i],widgetH[i]);
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55
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56 // Find row heights and column widths (non cumulative)
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57 rowH.length = rows;
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58 colW.length = cols; //WARNING: code reliant on these being initialised to zero
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59 for (uint i = 0; i < subWidgets.length; ++i) {
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60 uint n = i / cols; // row
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61 if (rowH[n] < widgetH[i]) rowH[n] = widgetH[i];
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62 n = i % cols; // column
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63 if (colW[n] < widgetW[i]) colW[n] = widgetW[i];
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64 }
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65
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66 // rowY / colX
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67 rowY.length = rows;
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68 colX.length = cols;
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69 int spacing = window.renderer.layoutSpacing;
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70
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71 int cum = 0;
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72 foreach (i, x; rowH) {
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73 rowY[i] = cum;
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74 cum += x + spacing;
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75 }
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76 h = cum - spacing; // total height
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77 cum = 0;
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78 foreach (i, x; colW) {
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79 colX[i] = cum;
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80 cum += x + spacing;
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81 }
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82 w = cum - spacing; // total width
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83 }
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84
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85 void setPosition (int x, int y) {
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86 this.x = x;
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87 this.y = y;
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88
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89 foreach (i,widget; subWidgets)
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90 widget.setPosition (x + colX[i % cols], y + rowY[i / cols]);
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91 }
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92
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93 // Find the relevant widget.
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94 IWidget getWidget (int cx, int cy) {
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95 if (rows*cols == 0) return this; // special case
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96
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97 int lx = cx - x, ly = cy - y; // use coords relative to this widget
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98
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99 // Find the column
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100 int i = cols - 1; // starting from right...
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101 while (lx < colX[i]) { // decrement while left of this column
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102 if (i == 0) return this; // left of first column
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103 --i;
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104 } // now (lx >= colX[i])
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105 if (lx >= colX[i] + colW[i]) return this; // between columns
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106
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107 // Find the row;
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108 int j = rows - 1;
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109 while (ly < rowY[j]) {
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110 if (j == 0) return this;
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111 --j;
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112 }
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113 if (ly >= rowY[j] + rowH[j]) return this;
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114
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115 // Now we know it's in widget (i,j)'s cell (but the widget may not take up the whole cell)
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116 lx -= colX[i];
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117 ly -= rowY[j];
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118 IWidget widg = subWidgets[i + j*cols];
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119 widg.getCurrentSize (i,j);
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120 if (lx < i && ly < j)
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121 return widg.getWidget (cx, cy);
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122 }
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123
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124 void draw () {
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125 super.draw ();
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126
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127 foreach (widget; subWidgets)
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128 widget.draw ();
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129 }
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130
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131 protected:
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132 int rows, cols; // number of cells in grid
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133 int[] rowH; // row height (highest widget in the row)
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134 int[] colW; // column width (widest widget)
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135 int[] rowY; // cumulative rowH[i-1] + border and padding
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136 int[] colX; // cumulative colW[i-1] + border and padding
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137 IWidget[] subWidgets; // all widgets in the grid (by row):
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138 /* SubWidget order: [ 0 1 ]
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139 * [ 2 3 ] */
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140 }