Mercurial > projects > mde
annotate mde/gui/widget/layout.d @ 37:052df9b2fe07
Allowed widget resizing, changed widget IDs and made Input catch any callback exceptions.
Enabled widget resizing.
Removed IRenderer's temporary drawBox method and added drawButton for ButtonWidget.
Made the Widget class abstract and added FixedWidget and SizableWidget classes.
Rewrote much of createWidget to use meta-code; changed widget IDs.
Made Input catch callback exceptions and report error messages.
committer: Diggory Hardy <diggory.hardy@gmail.com>
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Mon, 05 May 2008 14:47:25 +0100 |
parents | 6b4116e6355c |
children | 8c4c96f04e7f |
rev | line source |
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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 * |
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24 * Since a grid with either dimension zero is not useful, there must be at least one sub-widget. */ |
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25 class GridLayoutWidget : Widget |
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26 { |
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27 this (IWindow wind, IWidget, int[] data) { |
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28 // Get grid size and check data |
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29 // Check sufficient data for rows, cols, and at least one widget: |
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30 if (data.length < 3) throw new WidgetDataException; |
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31 rows = data[0]; |
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32 cols = data[1]; |
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33 if (data.length != 2 + rows * cols) throw new WidgetDataException; |
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34 /* data.length >= 3 so besides checking the length is correct, this tells us: |
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35 * rows * cols >= 3 - 2 = 1 a free check! |
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36 * The only thing not checked is whether both rows and cols are negative, which would |
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37 * cause an exception when dynamic arrays are allocated later (and is unlikely). */ |
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38 |
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39 window = wind; |
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40 |
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41 // Get all sub-widgets |
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42 subWidgets.length = rows*cols; |
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43 foreach (i, inout subWidget; subWidgets) { |
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44 subWidget = window.makeWidget (data[i+2], this); |
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45 } |
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46 } |
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47 |
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48 bool isWSizable () { |
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49 if (colSizable == -2) { // check whether any columns are resizable |
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50 for1: |
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51 for (uint i = 0; i < cols; ++i) { // for each column |
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52 for (uint j = 0; j < subWidgets.length; j += cols) // for each row |
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53 if (!subWidgets[i+j].isWSizable) // column not resizable |
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54 continue for1; // continue the outer for loop |
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55 |
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56 // column is resizable if we get to here |
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57 colSizable = i; |
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58 goto break1; // use goto in lieu of for...else |
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59 } |
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60 |
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61 // if we get here, no resizable column was found |
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62 colSizable = -1; |
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63 |
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64 break1:; |
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65 } |
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66 |
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67 if (colSizable >= 0) return true; |
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68 else return false; |
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69 } |
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70 |
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71 bool isHSizable () { |
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72 if (rowSizable == -2) { // check whether any columns are resizable |
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73 for2: |
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74 for (uint i = 0; i < subWidgets.length; i += cols) { // for each row |
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75 for (uint j = 0; j < cols; ++j) // for each column |
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76 if (!subWidgets[i+j].isHSizable) |
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77 continue for2; |
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78 |
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79 rowSizable = i / cols; // the current row |
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80 goto break2; |
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81 } |
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82 |
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83 rowSizable = -1; |
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84 |
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85 break2:; |
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86 } |
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87 |
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88 if (rowSizable >= 0) return true; |
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89 else return false; |
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90 } |
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91 |
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92 /* Calculates the minimal size from all rows and columns of widgets. */ |
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93 void getMinimalSize (out int mw, out int mh) { |
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94 // If rowHMin & colWMin are null, calculate them. They are set null whenever the contents |
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95 // or the contents' minimal size change, as well as when this widget is created. |
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96 if (rowHMin is null) |
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97 genMinRowColSizes; |
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98 |
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99 // Calculate the size, starting with the spacing: |
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100 mh = window.renderer.layoutSpacing; // use temporarily |
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101 mw = mh * (cols - 1); |
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102 mh *= (rows - 1); |
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103 |
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104 foreach (x; colWMin) // add the column/row's dimensions |
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105 mw += x; |
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106 foreach (x; rowHMin) |
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107 mh += x; |
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108 } |
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109 |
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110 void setSize (int nw, int nh) { |
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111 // Step 1: calculate the minimal row/column sizes. |
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112 int mw, mh; // FIXME: use w,h directly? |
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113 getMinimalSize (mw, mh); |
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114 colW = colWMin; // start with these dimensions, and increase if necessary |
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115 rowH = rowHMin; |
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116 |
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117 // Step 2: clamp nw/nh or expand a column/row to achieve the required size |
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118 if (nw <= mw) nw = mw; // clamp to minimal size |
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119 else { |
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120 if (isWSizable) // calculates colSizable; true if any is resizable |
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121 colW[colSizable] += nw - mw; // new width |
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122 else // no resizable column; so force the last one |
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123 colW[$-1] += nw - mw; |
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124 } |
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125 |
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126 if (nh <= mh) nh = mh; |
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127 else { |
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128 if (isHSizable) |
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129 rowH[rowSizable] += nh - mh; |
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130 else |
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131 rowH[$-1] += nh - mh; |
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132 } |
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133 |
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134 // Step 3: set each sub-widget's size. |
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135 foreach (i,widget; subWidgets) |
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136 widget.setSize (colW[i % cols], rowH[i / cols]); |
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137 |
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138 // Step 4: calculate the column and row positions |
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139 colX.length = cols; |
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140 rowY.length = rows; |
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141 int spacing = window.renderer.layoutSpacing; |
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142 |
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143 int cum = 0; |
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144 foreach (i, x; rowH) { |
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145 rowY[i] = cum; |
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146 cum += x + spacing; |
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147 } |
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148 h = cum - spacing; // set the total height |
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149 assert (h == nh); // FIXME: remove and set w/h directly once this is asserted |
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150 |
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151 cum = 0; |
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152 foreach (i, x; colW) { |
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153 colX[i] = cum; |
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154 cum += x + spacing; |
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155 } |
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156 w = cum - spacing; // total width |
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157 assert (w == nw); |
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158 } |
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159 |
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160 void setPosition (int x, int y) { |
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161 this.x = x; |
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162 this.y = y; |
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163 |
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164 foreach (i,widget; subWidgets) |
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165 widget.setPosition (x + colX[i % cols], y + rowY[i / cols]); |
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166 } |
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167 |
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168 |
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169 // Find the relevant widget. |
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170 IWidget getWidget (int cx, int cy) { |
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171 int lx = cx - x, ly = cy - y; // use coords relative to this widget |
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172 |
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173 // Find the column |
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174 int i = cols - 1; // starting from right... |
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175 while (lx < colX[i]) { // decrement while left of this column |
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176 if (i == 0) return this; // left of first column |
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177 --i; |
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178 } // now (lx >= colX[i]) |
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179 if (lx >= colX[i] + colW[i]) return this; // between columns |
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180 |
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181 // Find the row; |
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182 int j = rows - 1; |
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183 while (ly < rowY[j]) { |
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184 if (j == 0) return this; |
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185 --j; |
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186 } |
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187 if (ly >= rowY[j] + rowH[j]) return this; |
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188 |
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189 // 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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190 lx -= colX[i]; |
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191 ly -= rowY[j]; |
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192 IWidget widg = subWidgets[i + j*cols]; |
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193 widg.getCurrentSize (i,j); |
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194 if (lx < i && ly < j) |
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195 return widg.getWidget (cx, cy); |
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196 return this; // wasn't in cell |
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197 } |
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198 |
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199 void draw () { |
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200 super.draw (); |
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201 |
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202 foreach (widget; subWidgets) |
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203 widget.draw (); |
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204 } |
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205 |
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206 private: |
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207 void genMinRowColSizes () { |
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208 // Find the sizes of all subWidgets |
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209 int[] widgetW = new int[subWidgets.length]; // dimensions |
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210 int[] widgetH = new int[subWidgets.length]; |
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211 foreach (i,widget; subWidgets) |
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212 widget.getMinimalSize (widgetW[i],widgetH[i]); |
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213 |
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214 // Find the minimal row heights and column widths (non cumulative) |
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215 colWMin = new int[cols]; // set length |
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216 rowHMin = new int[rows]; |
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217 for (uint i = 0; i < subWidgets.length; ++i) { |
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218 uint n; |
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219 n = i % cols; // column |
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220 if (colWMin[n] < widgetW[i]) colWMin[n] = widgetW[i]; |
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221 n = i / cols; // row |
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222 if (rowHMin[n] < widgetH[i]) rowHMin[n] = widgetH[i]; |
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223 } |
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224 } |
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225 |
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226 protected: |
37
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227 int cols, rows; // number of cells in grid |
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228 |
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229 int colSizable = -2;// 0..cols-1 means this column is resizable |
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230 int rowSizable = -2;// -2 means not calculated yet, -1 means not resizable |
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231 |
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232 int[] colWMin; // minimal column width |
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233 int[] rowHMin; // minimal row height |
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234 int[] colW; // column width (widest widget) |
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235 int[] rowH; // row height (highest widget in the row) |
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236 |
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237 int[] colX; // cumulative colW[i-1] + padding (add x to get column's left x-coord) |
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238 int[] rowY; // cumulative rowH[i-1] + padding |
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239 |
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240 IWidget[] subWidgets; // all widgets in the grid (by row): |
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241 /* SubWidget order: [ 0 1 ] |
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242 * [ 2 3 ] */ |
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243 } |