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annotate mde/gui/widget/layout.d @ 42:8bf53e711cc7

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Partially implemented column/row resizing (code not working well). Committing before reverting/deleting many edits. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Wed, 14 May 2008 12:31:09 +0100
parents b3a6ca4516b4
children 1530d9c04d4d
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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
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22 /** Encapsulates a grid of Widgets.
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23 *
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24 * Currently there is no support for changing number of cells, sub-widgets or sub-widget properties
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25 * (namely isW/HSizable and minimal size) after this() has run.
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26 *
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27 * Since a grid with either dimension zero is not useful, there must be at least one sub-widget.
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28 *
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29 * The grid has no border but has spacing between widgets. */
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30 class GridLayoutWidget : Widget
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31 {
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32 this (IWindow wind, int[] data) {
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33 // Get grid size and check data
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34 // Check sufficient data for rows, cols, and at least one widget:
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35 if (data.length < 4) throw new WidgetDataException;
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36 super (wind, data);
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37
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38 rows = data[1];
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39 cols = data[2];
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40 if (data.length != 3 + rows * cols) throw new WidgetDataException;
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41 /* data.length >= 3 so besides checking the length is correct, this tells us:
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42 * rows * cols >= 4 - 3 = 1 a free check!
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43 * The only thing not checked is whether both rows and cols are negative, which would
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44 * cause an exception when dynamic arrays are allocated later (and is unlikely). */
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45
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46 // Get all sub-widgets
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47 subWidgets.length = rows*cols;
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48 foreach (i, ref subWidget; subWidgets) {
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49 subWidget = window.makeWidget (data[i+3]);
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50 }
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52 // Calculate cached construction data
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53 genCachedConstructionData;
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54 }
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55
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56 int[] adjust (int[] data) {
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57 // Give all sub-widgets their data:
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58 foreach (widget; subWidgets)
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59 data = widget.adjust (data);
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60
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61 // colWMin/rowHMin are needed as absolute quantities in this function:
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62 int[] cwMin = new int[colWMin.length];
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63 foreach (i,x; colWMin)
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64 cwMin[i] = x>=0 ? x : -x;
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65 int[] rhMin = new int[rowHMin.length];
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66 foreach (i,x; rowHMin)
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67 rhMin[i] = x>=0 ? x : -x;
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68
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69 /* We basically short-cut setSize by loading previous col/row sizes and doing the final
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70 * calculations.
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71 * Note: if setSize gets called afterwards, it should have same dimensions and so not do
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72 * anything. */
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74 int lenUsed = 0;
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75 if (data.length < rows + cols) { // data error; use defaults
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76 colW = cwMin;
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77 rowH = rhMin;
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78 } else { // sufficient data
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79 lenUsed = rows+cols;
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80 colW = data[0..cols];
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81 rowH = data[cols..lenUsed];
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82
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83 // Check row sizes are valid:
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84 //NOTE: this could be made optional
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85 //NOTE: could also check non-resizable sizes are not too large
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86 foreach (i, ref w; colW)
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87 if (w < cwMin[i]) w = cwMin[i];
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88 foreach (i, ref h; rowH)
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89 if (h < rhMin[i]) h = rhMin[i];
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90 }
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91
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92 genCachedMutableData;
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93 w = colW[$-1] + colX[$-1];
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94 h = rowY[$-1] + rowH[$-1];
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95
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96 return data[lenUsed..$];
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97 }
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98
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99 int[] getCreationData () {
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100 int[] ret;
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101 ret.length = 3 + subWidgets.length;
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102
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103 ret [0..3] = [widgetType, rows, cols]; // first data
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104
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105 foreach (i,widget; subWidgets) // sub widgets
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106 ret[i+3] = window.addCreationData (widget);
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107
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108 return ret;
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109 }
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110 int[] getMutableData () {
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111 int[] ret;
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112 foreach (widget; subWidgets)
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113 ret ~= widget.getMutableData;
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114
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115 ret ~= colW ~ rowH;
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116 return ret;
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117 }
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118
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119 bool isWSizable () {
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120 // True if any column is resizable:
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121 foreach (d; colWMin)
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122 if (d >= 0)
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123 return true;
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124 return false;
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125 }
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126
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127 bool isHSizable () {
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128 foreach (d; rowHMin)
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129 if (d >= 0)
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130 return true;
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131 return false;
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132 }
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133
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134 /* Calculates the minimal size from all rows and columns of widgets. */
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135 void getMinimalSize (out int mw, out int mh) {
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136 mw = this.mw;
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137 mh = this.mh;
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138 }
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139
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140 void setSize (int nw, int nh) {
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141 // Step 1: calculate the row/column sizes.
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142 w += adjustCellSizes (colW, colWMin, nw - w, true);
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143 h += adjustCellSizes (rowH, rowHMin, nh - h, true);
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144
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145 // Step 2: calculate the row/column offsets (positions) and set the sub-widgets sizes.
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146 genCachedMutableData;
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147
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148 // Step 3: position needs to be set
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149 // Currently this happens by specifying that setPosition should be run after setSize.
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150 }
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151
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152 void setPosition (int x, int y) {
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153 this.x = x;
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154 this.y = y;
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155
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156 foreach (i,widget; subWidgets)
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157 widget.setPosition (x + colX[i % cols], y + rowY[i / cols]);
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158 }
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159
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160
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161 // Find the relevant widget.
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162 IWidget getWidget (int cx, int cy) {
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163 int lx = cx - x, ly = cy - y; // use coords relative to this widget
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164
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165 // Find the column
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166 int i = cols - 1; // starting from right...
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167 while (lx < colX[i]) { // decrement while left of this column
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168 assert (i > 0, "getWidget: left of first column"); // should be impossible
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169 --i;
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170 } // now (lx >= colX[i])
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171 if (lx >= colX[i] + colW[i]) return this; // between columns
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172
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173 // Find the row;
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174 int j = rows - 1;
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175 while (ly < rowY[j]) {
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176 assert (j > 0, "getWidget: above first row"); // should be impossible
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177 --j;
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178 }
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179 if (ly >= rowY[j] + rowH[j]) return this;
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180
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181 // 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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182 lx -= colX[i];
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183 ly -= rowY[j];
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184 IWidget widg = subWidgets[i + j*cols];
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185 widg.getCurrentSize (i,j);
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186 if (lx < i && ly < j)
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187 return widg.getWidget (cx, cy);
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188 return this; // wasn't in cell
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189 }
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190
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191 // Resizing columns & rows
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192 void clickEvent (ushort cx, ushort cy, ubyte b, bool state) {
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193 if (b == 1 && state == true) {
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194 int l = cx - x; // use relative coords
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195
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196 // Find the column
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197 resizeCol = cols - 1; // from the right...
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198 while (l < colX[resizeCol]) { // decrement while left of this column
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199 assert (resizeCol > 0, "clickEvent: left of first column");
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200 --resizeCol;
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201 } // now (l >= colX[resizeCol])
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202 if (l < colX[resizeCol] + colW[resizeCol]) resizeCol = -1; // on a sub-widget
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203
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204 // Find the row
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205 resizeRow = rows - 1;
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206 while (l < rowY[resizeRow]) {
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207 assert (resizeRow > 0, "clickEvent: left of first column");
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208 --resizeRow;
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209 }
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210 if (l < rowY[resizeRow] + rowH[resizeRow]) resizeRow = -1; // on a sub-widget
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211
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212 /* Note: Because of getWidget, this function is only called if the click is not on a
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213 * sub-widget, so we know it's on some divisor (so at least one of resizeCol and
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214 * resizeRow is non-negative). */
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215
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216 dragX = cx;
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217 dragY = cy;
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218
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219 window.gui.addClickCallback (&endCallback);
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220 window.gui.addMotionCallback (&resizeCallback);
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221 }
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222 }
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223
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224 void draw () {
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225 super.draw ();
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226
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227 foreach (widget; subWidgets)
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228 widget.draw ();
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229 }
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230
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231 private:
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232 //BEGIN Cache calculation functions
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233 /* Calculations which need to be run whenever a new sub-widget structure is set
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234 * (i.e. to produce cached data calculated from construction data). */
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235 void genCachedConstructionData () {
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236 // Calculate the minimal column and row sizes:
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237 colWMin = new int[cols]; // set length, making sure the arrays are initialised to zero
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238 rowHMin = new int[rows];
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239 int ww, wh; // sub-widget minimal sizes
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240 foreach (i,widget; subWidgets) {
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241 widget.getMinimalSize (ww, wh);
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242
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243 // Increase dimensions if current minimal size is larger:
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244 uint n = i % cols; // column
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245 if (colWMin[n] < ww) colWMin[n] = ww;
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246 n = i / cols; // row
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247 if (rowHMin[n] < wh) rowHMin[n] = wh;
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248 }
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249
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250
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251 // Calculate the overall minimal size, starting with the spacing:
41
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252 mh = window.renderer.layoutSpacing; // use mh temporarily
40
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253 mw = mh * (cols - 1);
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254 mh *= (rows - 1);
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255
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diff changeset
256 foreach (x; colWMin) // add the column/row's dimensions
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257 mw += x;
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diff changeset
258 foreach (x; rowHMin)
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diff changeset
259 mh += x;
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260
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diff changeset
261
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262 // Find which cols/rows are resizable:
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263 forCols:
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264 for (uint i = 0; i < cols; ++i) { // for each column
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265 for (uint j = 0; j < subWidgets.length; j += cols) // for each row
42
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266 if (!subWidgets[i+j].isWSizable) { // column not resizable
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267 colWMin[i] = -colWMin[i]; // negate to show not resizable
40
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268 continue forCols; // continue the outer for loop
42
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269 }
40
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270
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271 // column is resizable if we get to here
42
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272 // entry is left positive, meaning it is resizable
40
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273 }
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274
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275 forRows:
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276 for (uint i = 0; i < subWidgets.length; i += cols) { // for each row
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277 for (uint j = 0; j < cols; ++j) // for each column
42
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278 if (!subWidgets[i+j].isHSizable) {
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279 j = i / cols; // reuse: will be reinitialised next iteration
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280 rowHMin[j] = -rowHMin[j];
40
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281 continue forRows;
42
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282 }
37
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283 }
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284 }
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285
40
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286 /* Calculations which need to be run whenever resizing occurs (or deeper alterations)
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287 * (i.e. to produce cached data calculated from construction and mutable data). */
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diff changeset
288 void genCachedMutableData () {
39
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289 // Calculate column and row locations:
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290 colX.length = cols;
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291 rowY.length = rows;
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292 int spacing = window.renderer.layoutSpacing;
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293
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diff changeset
294 int cum = 0;
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295 foreach (i, x; rowH) {
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diff changeset
296 rowY[i] = cum;
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297 cum += x + spacing;
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298 }
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299
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diff changeset
300 cum = 0;
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diff changeset
301 foreach (i, x; colW) {
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diff changeset
302 colX[i] = cum;
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diff changeset
303 cum += x + spacing;
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304 }
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305
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diff changeset
306 // Tell subwidgets their new sizes:
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diff changeset
307 foreach (i,widget; subWidgets)
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diff changeset
308 widget.setSize (colW[i % cols], rowH[i / cols]);
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309 }
42
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310 //END Cache calculation functions
39
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diff changeset
311
42
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312 /* Adjust the total size of rows/columns (including spacing) by diff.
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313 *
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314 * Params:
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315 * cellD = current sizes; is adjusted by the function to new sizes
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316 * cellDMin = minimal sizes (see colWMin/rowHMin)
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317 * diff = amount to increase/decrease the total size
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diff changeset
318 * startHigh = if true, start resizing from the tail end of cellD, instead of the beginning
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diff changeset
319 *
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320 * Returns:
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321 * The amount adjusted. This may be larger than diff, since cellD is clamped by cellDMin.
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diff changeset
322 */
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diff changeset
323 int adjustCellSizes (ref int[] cellD, ref int[] cellDMin, int diff, bool startHigh)
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diff changeset
324 in {// Could occur if adjust isn't called first, but this would be a code error:
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diff changeset
325 assert (cellD !is null, "adjustCellSizes: cellD is null");
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diff changeset
326 } body {
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diff changeset
327 size_t i = (startHigh ? cellD.length-1 : 0);
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diff changeset
328 size_t ic = (startHigh ? -1 : 1); // amount to iterate to next cell
40
b28d7adc786b Made GUI more robust to mutable data changes and improved much of GridLayoutWidget's code.
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parents: 39
diff changeset
329
42
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diff changeset
330 // FIXME: could do with an overhaul
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diff changeset
331 if (diff > 0) { // increase size of first resizable cell
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diff changeset
332 do {
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diff changeset
333 if (cellDMin[i] >= 0) { // cell is resizable
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diff changeset
334 cellD[i] += diff;
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diff changeset
335 return diff;
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diff changeset
336 }
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diff changeset
337 i += ic;
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diff changeset
338 } while (i >= 0 && i < cellD.length);
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parents: 41
diff changeset
339 // no resizable cell: revert to original
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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diff changeset
340 cellD[(startHigh ? cellD.length-1 : 0)] += diff;
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diff changeset
341 return diff;
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diff changeset
342 }
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343 else if (diff < 0) { // decrease
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344 int rd = diff; // running diff
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diff changeset
345 while (true) {
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diff changeset
346 // NOTE: could do this differently so that enlarged cells can be shrunk
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parents: 41
diff changeset
347 if (cellDMin[i] >= 0) { // i.e., if resizable:
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parents: 41
diff changeset
348 cellD[i] += rd; // decrease this cell's size (but may be too much)
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parents: 41
diff changeset
349 rd = cellD[i] - cellDMin[i];
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parents: 41
diff changeset
350 if (rd >= 0) // OK; we're done
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diff changeset
351 return diff;// we hit the mark exactly
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diff changeset
352
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diff changeset
353 // else we decreased it too much!
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parents: 41
diff changeset
354 cellD[i] = cellDMin[i];
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parents: 41
diff changeset
355 // rd is remainder to decrease by
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 41
diff changeset
356 }
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
357
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
358 i += (startHigh ? -1 : 1); // next cell
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
359 if (i < 0 || i >= cellD.length) // run out of next cells
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parents: 41
diff changeset
360 return diff - rd; // still had rd left to decrease
40
b28d7adc786b Made GUI more robust to mutable data changes and improved much of GridLayoutWidget's code.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 39
diff changeset
361 }
42
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Diggory Hardy <diggory.hardy@gmail.com>
parents: 41
diff changeset
362 }
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
363 else // no adjustment needed
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
364 return 0;
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
365 }
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
366
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parents: 41
diff changeset
367 //BEGIN Col/row resizing
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parents: 41
diff changeset
368 void resizeCallback (ushort cx, ushort cy) {
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
369 int move; // NOTE: all resizing is relative, unlike in Window
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parents: 41
diff changeset
370
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parents: 41
diff changeset
371 if (resizeCol >= 0) {
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 41
diff changeset
372 move = cx - dragX;
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
373 int[] d0 = colW[0..resizeCol];
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
374 int[] d1 = colW[resizeCol..$];
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parents: 41
diff changeset
375 int[] m0 = colWMin[0..resizeCol];
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
376 int[] m1 = colWMin[resizeCol..$];
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parents: 41
diff changeset
377
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
378 // do shrinking first (in case we hit the minimum)
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
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parents: 41
diff changeset
379 // Note: we rely on x[a..b] pointing to the same memory as x
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 41
diff changeset
380 if (move > 0) {
8bf53e711cc7 Partially implemented column/row resizing (code not working well).
Diggory Hardy <diggory.hardy@gmail.com>
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381 move = -adjustCellSizes (d1, m1, -move, false);
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382 adjustCellSizes (d0, m0, move, true);
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383 } else {
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384 move = -adjustCellSizes (d0, m0, move, true);
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385 adjustCellSizes (d1, m1, move, false);
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386 }
42
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387 }
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388 // FIXME: vertical
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389
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390 window.requestRedraw;
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391 }
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392 bool endCallback (ushort cx, ushort cy, ubyte b, bool state) {
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393 if (b == 1 && state == false) {
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394 window.gui.removeCallbacks (cast(void*) this);
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395 return true; // we've handled the up-click
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396 }
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397 return false; // we haven't handled it
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398 }
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399
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400 protected:
42
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401 // Data for resizing cols/rows:
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402 int resizeCol = -1, // col/row being resized;
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403 resizeRow = -1; // negative if none
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404 int dragX, dragY; // coords where drag starts
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405 //END Col/row resizing
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406
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407 // Construction data (saved):
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408 int cols, rows; // number of cells in grid
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409 IWidget[] subWidgets; // all widgets in the grid (by row):
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410 /* SubWidget order: [ 0 1 ]
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411 * [ 2 3 ] */
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412
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413 // Cached data calculated from construction data:
42
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414 int[] colWMin; // absolute value is minimal column width / row height
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415 int[] rowHMin; // negative if fixed size, entry >= 0 if resizible
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416 int mw, mh; // minimal dimensions
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417
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418 // Mutable data (saved):
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419 int[] colW; // column width (widest widget)
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420 int[] rowH; // row height (highest widget in the row)
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421
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422 // Cached data calculated from construction and mutable data:
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423 int[] colX; // cumulative colW[i-1] + padding (add x to get column's left x-coord)
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424 int[] rowY; // cumulative rowH[i-1] + padding
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425 }