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annotate mde/gui/widget/layout.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 8c4c96f04e7f
children b28d7adc786b
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32
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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;
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21
37
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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, 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 < 4) throw new WidgetDataException;
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31 super (wind, data);
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32
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33 rows = data[1];
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34 cols = data[2];
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35 if (data.length != 3 + rows * cols) throw new WidgetDataException;
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36 /* data.length >= 3 so besides checking the length is correct, this tells us:
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37 * rows * cols >= 4 - 3 = 1 a free check!
37
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38 * The only thing not checked is whether both rows and cols are negative, which would
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39 * cause an exception when dynamic arrays are allocated later (and is unlikely). */
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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+3]);
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45 }
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46 }
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47
39
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48 int[] adjust (int[] data) {
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49 // Give all sub-widgets their data:
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50 foreach (widget; subWidgets)
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51 data = widget.adjust (data);
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52 if (data.length < rows + cols) throw new MutableDataException;
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53
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54 /* We basically short-cut setSize by loading previous col/row sizes and doing the final
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55 * calculations. There isn't checks that the data is valid/up-to-date... worst case is too
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56 * small overlapping widgets or huge ones?
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57 * Note: if setSize gets called afterwards, it should have same dimensions and so not do
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58 * anything. */
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59 colW = data[0..cols];
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60 rowH = data[cols..rows+cols];
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61 setColRowSizes;
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62 w = colW[$-1] + colX[$-1];
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63 h = rowY[$-1] + rowH[$-1];
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64
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65 return data[rows+cols..$];
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66 }
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67
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68 int[] getCreationData () {
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69 int[] ret;
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70 ret.length = 3 + subWidgets.length;
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71
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72 ret [0..3] = [widgetType, rows, cols]; // first data
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73
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74 foreach (i,widget; subWidgets) // sub widgets
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75 ret[i+3] = window.addCreationData (widget);
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76
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77 return ret;
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78 }
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79 int[] getMutableData () {
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80 int[] ret;
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81 foreach (widget; subWidgets)
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82 ret ~= widget.getMutableData;
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83
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84 ret ~= colW ~ rowH;
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85 return ret;
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86 }
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87
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88 bool isWSizable () {
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89 if (colSizable == -2) { // check whether any columns are resizable
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90 for1:
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91 for (uint i = 0; i < cols; ++i) { // for each column
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92 for (uint j = 0; j < subWidgets.length; j += cols) // for each row
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93 if (!subWidgets[i+j].isWSizable) // column not resizable
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94 continue for1; // continue the outer for loop
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95
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96 // column is resizable if we get to here
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97 colSizable = i;
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98 goto break1; // use goto in lieu of for...else
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99 }
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100
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101 // if we get here, no resizable column was found
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102 colSizable = -1;
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103
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104 break1:;
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105 }
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106
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107 if (colSizable >= 0) return true;
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108 else return false;
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109 }
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110
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111 bool isHSizable () {
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112 if (rowSizable == -2) { // check whether any columns are resizable
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113 for2:
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114 for (uint i = 0; i < subWidgets.length; i += cols) { // for each row
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115 for (uint j = 0; j < cols; ++j) // for each column
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116 if (!subWidgets[i+j].isHSizable)
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117 continue for2;
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118
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119 rowSizable = i / cols; // the current row
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120 goto break2;
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121 }
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122
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123 rowSizable = -1;
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124
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125 break2:;
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126 }
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127
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128 if (rowSizable >= 0) return true;
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129 else return false;
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130 }
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131
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132 /* Calculates the minimal size from all rows and columns of widgets. */
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133 void getMinimalSize (out int mw, out int mh) {
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134 // If rowHMin & colWMin are null, calculate them. They are set null whenever the contents
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135 // or the contents' minimal size change, as well as when this widget is created.
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136 if (rowHMin is null)
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137 genMinRowColSizes;
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138
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139 // Calculate the size, starting with the spacing:
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140 mh = window.renderer.layoutSpacing; // use temporarily
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141 mw = mh * (cols - 1);
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142 mh *= (rows - 1);
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143
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144 foreach (x; colWMin) // add the column/row's dimensions
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145 mw += x;
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146 foreach (x; rowHMin)
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147 mh += x;
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148 }
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149
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150 void setSize (int nw, int nh) {
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151 /* For each of width and height, there are several cases:
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152 * [new value is] more than old value
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153 * -> enlarge any row/column
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154 * same as old value
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155 * -> do nothing
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156 * more than min but less than current value
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157 * -> find an enlarged row/col and reduce size
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158 * -> repeat if necessary
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159 * minimal value or less
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160 * -> clamp to min and use min col/row sizes
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161 */
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162 // FIXME: implement!
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163
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164 // Step 1: calculate the minimal row/column sizes.
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165 alias w mw; // no need for extra vars, just use these
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166 alias h mh;
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167 getMinimalSize (mw, mh);
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168 colW = colWMin.dup; // start with these dimensions, and increase if necessary
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169 rowH = rowHMin.dup; // duplicate, because we may want to resize without recalculating *Min
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170
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171 // Step 2: clamp nw/nh or expand a column/row to achieve the required size
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172 if (nw <= mw) nw = mw; // clamp to minimal size
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173 else {
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174 if (isWSizable) // calculates colSizable; true if any is resizable
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175 colW[colSizable] += nw - mw; // new width
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176 else // no resizable column; so force the last one
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177 colW[$-1] += nw - mw;
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178 }
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179
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180 if (nh <= mh) nh = mh;
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181 else {
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182 if (isHSizable)
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183 rowH[rowSizable] += nh - mh;
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184 else
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185 rowH[$-1] += nh - mh;
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186 }
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187
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188 w = nw;
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189 h = nh;
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190
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191 // Step 3: set each sub-widget's size.
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192 // Step 4: calculate the column and row positions
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193 setColRowSizes;
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194
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195 // Step 5: position needs resetting
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196 // Currently this happens by specifying that setPosition should be run after setSize.
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197 }
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198
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199 void setPosition (int x, int y) {
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200 this.x = x;
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201 this.y = y;
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202
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203 foreach (i,widget; subWidgets)
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204 widget.setPosition (x + colX[i % cols], y + rowY[i / cols]);
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205 }
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206
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207
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208 // Find the relevant widget.
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209 IWidget getWidget (int cx, int cy) {
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210 int lx = cx - x, ly = cy - y; // use coords relative to this widget
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211
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212 // Find the column
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213 int i = cols - 1; // starting from right...
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214 while (lx < colX[i]) { // decrement while left of this column
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215 if (i == 0) return this; // left of first column
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216 --i;
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217 } // now (lx >= colX[i])
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218 if (lx >= colX[i] + colW[i]) return this; // between columns
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219
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220 // Find the row;
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221 int j = rows - 1;
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222 while (ly < rowY[j]) {
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223 if (j == 0) return this;
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224 --j;
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225 }
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226 if (ly >= rowY[j] + rowH[j]) return this;
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227
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228 // 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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229 lx -= colX[i];
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230 ly -= rowY[j];
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231 IWidget widg = subWidgets[i + j*cols];
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232 widg.getCurrentSize (i,j);
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233 if (lx < i && ly < j)
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234 return widg.getWidget (cx, cy);
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235 return this; // wasn't in cell
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236 }
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237
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238 void draw () {
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239 super.draw ();
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240
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241 foreach (widget; subWidgets)
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242 widget.draw ();
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243 }
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244
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245 private:
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246 void genMinRowColSizes () {
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247 // Find the sizes of all subWidgets
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248 int[] widgetW = new int[subWidgets.length]; // dimensions
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249 int[] widgetH = new int[subWidgets.length];
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250 foreach (i,widget; subWidgets)
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251 widget.getMinimalSize (widgetW[i],widgetH[i]);
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252
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253 // Find the minimal row heights and column widths (non cumulative)
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254 colWMin = new int[cols]; // set length
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255 rowHMin = new int[rows];
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256 for (uint i = 0; i < subWidgets.length; ++i) {
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257 uint n;
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258 n = i % cols; // column
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259 if (colWMin[n] < widgetW[i]) colWMin[n] = widgetW[i];
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260 n = i / cols; // row
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261 if (rowHMin[n] < widgetH[i]) rowHMin[n] = widgetH[i];
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262 }
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263 }
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264
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265 void setColRowSizes () {
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266 // Calculate column and row locations:
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267 colX.length = cols;
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268 rowY.length = rows;
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269 int spacing = window.renderer.layoutSpacing;
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270
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271 int cum = 0;
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272 foreach (i, x; rowH) {
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273 rowY[i] = cum;
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274 cum += x + spacing;
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275 }
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276
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277 cum = 0;
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278 foreach (i, x; colW) {
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279 colX[i] = cum;
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280 cum += x + spacing;
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281 }
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282
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283 // Tell subwidgets their new sizes:
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284 foreach (i,widget; subWidgets)
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285 widget.setSize (colW[i % cols], rowH[i / cols]);
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286 }
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287
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288 protected:
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289 int cols, rows; // number of cells in grid
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290
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291 int colSizable = -2;// 0..cols-1 means this column is resizable
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292 int rowSizable = -2;// -2 means not calculated yet, -1 means not resizable
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293
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294 int[] colWMin; // minimal column width
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295 int[] rowHMin; // minimal row height
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296 int[] colW; // column width (widest widget)
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297 int[] rowH; // row height (highest widget in the row)
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298
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299 int[] colX; // cumulative colW[i-1] + padding (add x to get column's left x-coord)
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300 int[] rowY; // cumulative rowH[i-1] + padding
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301
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302 IWidget[] subWidgets; // all widgets in the grid (by row):
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303 /* SubWidget order: [ 0 1 ]
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304 * [ 2 3 ] */
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305 }