Mercurial > projects > mde
annotate mde/gui/widget/layout.d @ 93:08a4ae11454b
Widgets now save dimensions without preventing structural changes in the base config file from applying.
Widget dimensional data separated from other data in files, hence above change.
Moved TextAdapter from TextWidget to IRenderer.
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Tue, 21 Oct 2008 11:35:15 +0100 |
parents | 085f2ca31914 |
children | 9520cc0448e5 |
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; |
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21 |
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22 import mde.gui.widget.TextWidget; |
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23 import mde.gui.content.options; |
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24 import mde.gui.content.Content; |
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25 |
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26 import tango.util.container.HashMap; |
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27 |
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28 debug { |
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29 import tango.util.log.Log : Log, Logger; |
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30 private Logger logger; |
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31 static this () { |
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32 logger = Log.getLogger ("mde.gui.widget.layout"); |
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33 } |
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34 } |
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35 |
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36 /************************************************************************************************* |
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37 * Encapsulates a grid of Widgets. |
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38 * |
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39 * Currently there is no support for changing number of cells, sub-widgets or sub-widget properties |
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40 * (namely isW/HSizable and minimal size) after this() has run. |
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41 * |
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42 * Since a grid with either dimension zero is not useful, there must be at least one sub-widget. |
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43 * |
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44 * The grid has no border but has spacing between widgets. |
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45 *************************************************************************************************/ |
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46 class GridLayoutWidget : GridWidget |
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47 { |
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48 /** Constructor for a grid layout widget. |
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49 * |
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50 * Widget uses the initialisation data: |
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51 * --- |
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52 * ints = [widget_type, align_flags, rows, cols] |
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53 * // or with column widths and row heights: |
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54 * ints = [widget_type, align_flags, rows, cols, col1width, ..., colCwidth, row1height, ..., rowRheight] |
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55 * strings = [w11, w12, ..., w1C, ..., wR1, ..., wRC] |
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56 * --- |
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57 * where R and C are the number of rows and columns, and wij is the ID (from parent Window's |
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58 * list) for the widget in row i and column j. The number of parameters must be r*c + 3. |
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59 * |
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60 * The content parameter is passed on to all children accepting an IContent. */ |
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61 this (IWidgetManager mgr, widgetID id, WidgetData data, IContent content) { |
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62 // Get grid size and check data |
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63 // Check sufficient data for type, align-flags, rows, cols, and possibly row/col widths. |
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64 if (data.ints.length != 4) throw new WidgetDataException (this); |
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65 |
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66 rows = data.ints[2]; |
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67 cols = data.ints[3]; |
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68 // Check: at least one sub-widget, ints length == 3, strings' length is correct: |
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69 if (rows < 1 || cols < 1 || data.ints.length != 4 || data.strings.length != rows * cols) |
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70 throw new WidgetDataException (this); |
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71 |
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72 // Get all sub-widgets |
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73 subWidgets.length = rows*cols; |
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74 foreach (i, ref subWidget; subWidgets) { |
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75 subWidget = mgr.makeWidget (data.strings[i], content); |
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76 } |
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77 |
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78 initWidths = mgr.dimData (id); // may be null, tested later |
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79 |
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80 super (mgr, id, data); |
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81 } |
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82 |
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83 // Save column/row sizes. Currently always do so. |
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84 bool saveChanges () { |
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85 foreach (widget; subWidgets) // recurse on subwidgets |
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86 widget.saveChanges (); |
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87 |
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88 mgr.setDimData (id, col.width ~ row.width); |
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89 return true; |
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90 } |
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91 protected: |
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92 } |
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93 |
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94 |
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95 /************************************************************************************************* |
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96 * Trial layout of sub-widgets of one type only. |
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97 *************************************************************************************************/ |
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98 class TrialContentLayoutWidget : GridWidget |
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99 { |
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100 this (IWidgetManager mgr, widgetID id, WidgetData data) { |
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101 debug scope (failure) |
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102 logger.warn ("TrialContentLayoutWidget: failure"); |
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103 WDCheck (data, 2, 1); |
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104 |
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105 OptionList optsList = OptionList.trial(); |
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106 rows = optsList.list.length; |
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107 cols = 1; |
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108 |
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109 // Get all sub-widgets |
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110 subWidgets.length = rows*cols; |
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111 foreach (i, c; optsList.list) { |
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112 subWidgets[i] = mgr.makeWidget (data.strings[0], c); |
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113 } |
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114 super (mgr, id, data); |
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115 } |
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116 |
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117 bool saveChanges () { |
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118 // Since all sub-widgets have the same id, it only makes sense to call on one |
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119 if (subWidgets is null) |
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120 return false; |
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121 return subWidgets[0].saveChanges; |
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122 } |
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123 |
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124 private: |
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125 OptionList optsList; |
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126 } |
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127 |
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128 |
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129 /************************************************************************************************* |
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130 * Backend for grid-based (includes column/row) layout widgets. |
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131 * |
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132 * A deriving class must at least do some work in it's constructor (see Ddoc for this() below) |
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133 * and provide an implementation of getCreationData() (unless Widget's version is sufficient). |
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134 * |
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135 * Since a grid with either dimension zero is not useful, there must be at least one sub-widget. |
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136 * |
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137 * The grid has no border but has spacing between widgets. |
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138 *************************************************************************************************/ |
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139 abstract class GridWidget : ParentWidget |
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140 { |
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141 //BEGIN Creation & saving |
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142 /** Partial constructor for a grid layout widget. |
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143 * |
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144 * Deriving classes should check data lengths, and set rows, cols, and the subWidgets array, |
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145 * before calling this super constructor. (If it's necessary to call super(...) first, |
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146 * the call to genCachedConstructionData can be moved to the derived this() methods.) |
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147 * |
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148 * Derived constructors may also set initWidths to the array of column widths followed by |
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149 * row heights used to initially set the row/column dimensions. |
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150 * |
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151 * Sub-widgets are finalized here, so no methods should be called on sub-widgets before calling |
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152 * this super. */ |
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153 protected this (IWidgetManager mgr, widgetID id, WidgetData data) { |
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154 super (mgr, id, data); |
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155 |
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156 // Create cell aligners with appropriate col/row adjustment function |
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157 if (data.ints[1] & 1) |
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158 col = AlignColumns.getInstance (id, cols); |
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159 else |
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160 col = (new AlignColumns (cols)); |
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161 col.addSetCallback (&setColWidth); |
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162 if (data.ints[1] & 2) |
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163 row = AlignColumns.getInstance (id~"R", rows); // id must be unique to that for cols! |
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164 else |
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165 row = (new AlignColumns (rows)); |
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166 row.addSetCallback (&setRowHeight); |
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167 } |
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168 |
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169 /** Prior to finalizing but after sub-widgets are finalized, some information needs to be |
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170 * passed to the AlignColumns. */ |
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171 void prefinalize () { |
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172 genCachedConstructionData; // min widths, sizableness |
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173 } |
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174 |
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175 /** Responsible for calculating the minimal size and initializing some stuff. |
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176 * |
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177 * As such, this must be the first function called after this(). */ |
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178 void finalize () { |
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179 logger.trace ("initWidths.length: {}", initWidths.length); |
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180 if (initWidths.length == cols + rows) { |
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181 col.setWidths (initWidths[0..cols]); |
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182 row.setWidths (initWidths[cols..$]); |
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183 } else { |
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184 col.setWidths; |
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185 row.setWidths; |
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186 } |
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187 initWidths = null; // free |
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188 |
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189 mw = col.mw; |
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190 mh = row.mw; |
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191 w = col.w; |
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192 h = row.w; |
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193 |
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194 // Tell subwidgets their new sizes. Positions are given by a later call to setPosition. |
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195 foreach (i,widget; subWidgets) { |
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196 // Resizing direction is arbitrarily set to negative: |
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197 widget.setWidth (col.width[i % cols], -1); |
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198 widget.setHeight (row.width[i / cols], -1); |
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199 } |
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200 } |
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201 //END Creation & saving |
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202 |
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203 //BEGIN Size & position |
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204 bool isWSizable () { |
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205 return col.firstSizable >= 0; |
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206 } |
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207 bool isHSizable () { |
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208 return row.firstSizable >= 0; |
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209 } |
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210 |
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211 void setWidth (wdim nw, int dir) { |
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212 w = col.resizeWidth (nw, dir); |
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213 // Note: setPosition must be called after! |
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214 } |
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215 void setHeight (wdim nh, int dir) { |
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216 h = row.resizeWidth (nh, dir); |
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217 // Note: setPosition must be called after! |
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218 } |
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219 |
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220 void setPosition (wdim x, wdim y) { |
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221 this.x = x; |
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222 this.y = y; |
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223 |
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224 debug assert (col.pos && row.pos, "setPosition: col/row.pos not set (code error)"); |
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225 foreach (i,widget; subWidgets) |
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226 widget.setPosition (x + col.pos[i % cols], y + row.pos[i / cols]); |
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227 } |
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228 //END Size & position |
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229 |
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230 |
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231 // Find the relevant widget. |
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232 IChildWidget getWidget (wdim cx, wdim cy) { |
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233 debug scope (failure) |
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234 logger.warn ("getWidget: failure; values: click, pos, width - {}, {}, {} - {}, {}, {}", cx, x, w, cy, y, h); |
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235 debug assert (cx >= x && cx < x + w && cy >= y && cy < y + h, "getWidget: not on widget (code error)"); |
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236 |
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237 // Find row/column: |
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238 myDiff i = col.getCell (cx - x); |
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239 myDiff j = row.getCell (cy - y); |
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240 if (i < 0 || j < 0) // on a space between widgets |
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241 return this; |
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242 |
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243 // On a subwidget; recurse call: |
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244 return subWidgets[i + j*cols].getWidget (cx, cy); |
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245 } |
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246 |
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247 // Resizing columns & rows |
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248 void clickEvent (wdabs cx, wdabs cy, ubyte b, bool state) { |
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249 debug scope (failure) |
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250 logger.warn ("clickEvent: failure"); |
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251 if (b == 1 && state == true) { |
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252 /* Note: Because of getWidget, this function is only called if the click is not on a |
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253 * sub-widget, so we know it's on some divisor (so at least one of resizeCol and |
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254 * resizeRow is non-negative). */ |
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255 |
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256 // find col/row's resizeD & resizeU |
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257 if (col.findResizeCols (cx - x) && row.findResizeCols (cy - y)) |
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258 return; // unable to resize |
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259 |
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260 dragX = cx; |
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261 dragY = cy; |
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262 |
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263 mgr.addClickCallback (&endCallback); |
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264 mgr.addMotionCallback (&resizeCallback); |
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265 } |
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266 } |
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267 |
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268 void draw () { |
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269 super.draw (); |
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270 |
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271 foreach (widget; subWidgets) |
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272 widget.draw (); |
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273 } |
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274 |
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275 private: |
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276 //BEGIN Cache calculation functions |
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277 /* Calculations which need to be run whenever a new sub-widget structure is set |
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278 * (i.e. to produce cached data calculated from construction data). |
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279 * Also need to be re-run if the renderer changes. |
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280 * |
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281 * rows, cols and subWidgets must be set before calling. Part of the set-up for AlignColumns |
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282 * (col and row). subWidgets need to know their minimal size and resizability. */ |
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283 void genCachedConstructionData () { |
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284 // Will only change if renderer changes: |
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285 // NOTE shared AlignColumns get this set by all sharing GridWidgets |
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286 col.spacing = row.spacing = mgr.renderer.layoutSpacing; |
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287 |
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288 // Calculate the minimal column and row sizes: |
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289 // AlignColumns (row, col) takes care of initializing minWidth. |
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290 foreach (i,widget; subWidgets) { |
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291 // Increase dimensions if current minimal size is larger: |
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292 myIt n = i % cols; // column |
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293 wdim md = widget.minWidth; |
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294 if (col.minWidth[n] < md) col.minWidth[n] = md; |
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295 n = i / cols; // row |
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296 md = widget.minHeight; |
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297 if (row.minWidth[n] < md) row.minWidth[n] = md; |
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298 } |
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299 |
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300 // Find which cols/rows are resizable: |
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301 // AlignColumns initializes sizable, and sets first and last sizables. |
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302 forCols: |
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303 for (myIt i = 0; i < cols; ++i) { // for each column |
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304 for (myIt j = 0; j < subWidgets.length; j += cols) // for each row |
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305 if (!subWidgets[i+j].isWSizable) // column not resizable |
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306 continue forCols; // continue the outer for loop |
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307 |
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308 // column is resizable if we get to here |
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309 col.sizable[i] = true; |
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310 } |
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311 |
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312 forRows: |
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313 for (myIt i = 0; i < subWidgets.length; i += cols) { // for each row |
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314 for (myIt j = 0; j < cols; ++j) // for each column |
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315 if (!subWidgets[i+j].isHSizable) |
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316 continue forRows; |
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317 |
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318 row.sizable[i / cols] = true; |
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319 } |
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320 } |
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321 //END Cache calculation functions |
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322 |
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323 |
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324 void setColWidth (myIt i, wdim w, int dir) { |
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325 for (myIt j = 0; j < rows; ++j) { |
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326 subWidgets[i + cols*j].setWidth (w, dir); |
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327 } |
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328 } |
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329 void setRowHeight (myIt j, wdim h, int dir) { |
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330 for (myIt i = 0; i < cols; ++i) { |
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331 subWidgets[i + cols*j].setHeight (h, dir); |
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332 } |
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333 } |
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334 |
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335 |
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336 //BEGIN Col/row resizing callback |
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337 void resizeCallback (wdim cx, wdim cy) { |
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338 col.resizeCols (cx - dragX); |
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339 row.resizeCols (cy - dragY); |
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340 |
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341 // NOTE: all adjustments are relative; might be better if they were absolute? |
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342 dragX = cx; |
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343 dragY = cy; |
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344 |
46
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345 foreach (i,widget; subWidgets) |
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346 widget.setPosition (x + col.pos[i % cols], |
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347 y + row.pos[i / cols]); |
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348 mgr.requestRedraw; |
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349 } |
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350 bool endCallback (wdabs cx, wdabs cy, ubyte b, bool state) { |
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351 if (b == 1 && state == false) { |
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352 mgr.removeCallbacks (cast(void*) this); |
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353 return true; // we've handled the up-click |
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354 } |
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355 return false; // we haven't handled it |
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356 } |
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357 |
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358 protected: |
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359 // Data for resizing cols/rows: |
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360 wdim dragX, dragY; // coords where drag starts |
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361 //END Col/row resizing callback |
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362 |
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363 myIt cols, rows; // number of cells in grid |
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364 wdim[] initWidths; // see this / setInitialSize |
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365 |
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366 /* All widgets in the grid, by row. Order: [ 0 1 ] |
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367 * [ 2 3 ] */ |
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368 //IChildWidget[] subWidgets; |
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369 |
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370 AlignColumns col, row; |
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371 } |
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372 |
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373 |
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374 /************************************************************************************************** |
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375 * Alignment device |
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376 * |
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377 * E.g. can control widths of columns within a grid, and provide sensible resizing, respecting the |
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378 * minimal width required by each cell in a column. Is not restricted to horizontal widths, but to |
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379 * ease descriptions, a horizontal context (column widths) is assumed. |
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380 * |
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381 * Cells should be of type IChildWidget. |
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382 * |
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383 * Cells are not directly interacted with, but minimal widths for each column are passed, and |
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384 * callback functions are used to adjust the width of any column. |
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385 *************************************************************************************************/ |
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386 class AlignColumns |
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387 { |
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388 /** Instance returned will be shared with any other widgets of same widgetID. |
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389 * |
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390 * Also ensures each widget sharing an instance expects the same number of columns. */ |
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391 static AlignColumns getInstance (widgetID id, myIt columns) { |
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392 AlignColumns* p = id in instances; |
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393 if (p) { |
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394 if (p.minWidth.length != columns) |
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395 throw new GuiException ("AlignColumns: no. of columns varies between sharing widgets (code error)"); |
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396 return *p; |
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397 } else { |
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398 auto a = new AlignColumns (columns); |
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399 instances[id] = a; |
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400 return a; |
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401 } |
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402 } |
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403 |
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404 /** Create an instance. After creation, the number of columns can only be changed by calling |
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405 * reset. |
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406 * |
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407 * After creation, minimal widths should be set for all columns (minWidth) and |
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408 * setWidths must be called before other functions are used. */ |
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409 this (myIt columns) { |
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410 reset (columns); |
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411 } |
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412 |
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413 /** Reset all column information (only keep set callbacks). |
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414 * |
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415 * Widths should be set after calling, as on creation. */ |
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416 void reset (myIt columns) { |
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417 if (columns < 1) |
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418 throw new GuiException("AlignColumns: created with <1 column"); |
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419 minWidth = new wdim[columns]; |
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420 sizable = new bool[columns]; |
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421 width = null; // enforce calling setWidths after this |
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422 firstSizable = -1; |
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423 lastSizable = -1; |
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424 spare = 0; |
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425 } |
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426 |
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427 /** Initialize widths as minimal widths. */ |
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428 void setWidths () { |
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429 if (!width) { |
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430 width = minWidth.dup; |
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431 initCalc; |
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432 } |
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433 } |
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434 /** Initialize widths from supplied list, checking validity. */ |
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435 void setWidths (wdim[] data) { |
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436 if (!width) { |
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437 // Set to provided data: |
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438 width = data; |
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439 // And check sizes are valid: |
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440 foreach (i, m; minWidth) { |
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441 // if fixed width or width is less than minimum: |
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442 if (!sizable[i] || width[i] < m) { |
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443 width[i] = m; |
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444 } |
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445 } |
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446 initCalc; |
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447 } |
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448 } |
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449 |
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450 /** Add a callback to be called to notify changes in a column's width. |
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451 * |
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452 * All callbacks added are called on a width change so that multiple objects may share a |
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453 * CellAlign object. */ |
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454 typeof(this) addSetCallback (void delegate (myIt,wdim,int) setCW) { |
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455 assert (setCW, "CellAlign.this: setCW is null (code error)"); |
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456 setWidthCb ~= setCW; |
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457 return this; |
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458 } |
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459 |
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460 /** Get the row/column of relative position l. |
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461 * |
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462 * returns: |
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463 * -i if in space to left of col i, or i if on col i, or -(num cols + 1) if in $(I spare) |
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464 * space to right of last column. */ |
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465 myDiff getCell (wdim l) { |
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466 myDiff i = minWidth.length - 1; // starting from right... |
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467 while (l < pos[i]) { // decrement while left of this column |
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468 debug assert (i > 0, "getCell: l < pos[0] (code error)"); |
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469 --i; |
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470 } // now (l >= pos[i]) |
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471 if (l >= pos[i] + width[i]) { // between columns or in spare space after last column |
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472 debug assert (i+1 < minWidth.length || |
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473 l < pos[i] + width[i] + spare, |
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474 "getCell: l >= total width (code error)"); |
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475 return -i - 1; // note: i might be 0 so cannot just return -i |
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476 } |
90
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477 return i; |
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478 } |
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479 |
91
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480 /** Adjust total size with direction dir. |
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481 * |
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482 * nw should be at least the minimal width. */ |
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483 wdim resizeWidth (wdim nw, int dir) { |
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484 if (nw < mw) { |
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485 debug logger.warn ("Widget dimension set below minimal"); |
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486 nw = mw; |
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487 } |
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488 if (nw == w) return w; |
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489 |
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490 wdim diff = nw - w; |
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491 if (firstSizable == -1) { |
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492 spare += diff; |
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493 w = nw; |
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494 } else |
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495 adjustCellSizes (diff, (dir == -1 ? lastSizable : firstSizable), dir); |
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496 |
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497 debug if (nw != w) { |
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498 logger.trace ("resizeWidth to {} failed, new width: {}",nw,w); |
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499 /+ Also print column widths & positions: |
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500 logger.trace ("resizeWidth to {} failed! Column dimensions and positions:",nw); |
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501 foreach (i,w; width) |
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502 logger.trace ("\t{}\t{}", w,pos[i]);+/ |
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503 } |
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504 return w; |
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505 } |
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506 |
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507 /** Calculate resizeU/resizeD, and return true if unable to resize. |
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508 * |
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509 * This and resizeCols are for moving dividers between cells. */ |
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510 bool findResizeCols (wdim l) { |
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511 resizeU = -getCell (l); // potential start for upward-resizes |
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512 if (resizeU <= 0 || resizeU > minWidth.length) |
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513 return true; // not on a space between cells or in spare space after last cell |
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514 resizeD = resizeU - 1; // potential start for downward-resizes |
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515 |
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516 while (!sizable[resizeU]) { // find first actually resizable column (upwards) |
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517 ++resizeU; |
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518 if (resizeU >= minWidth.length) { // cannot resize |
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519 resizeU = -1; |
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520 return true; |
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521 } |
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522 } |
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523 |
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524 while (!sizable[resizeD]) { // find first actually resizable column (downwards) |
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525 --resizeD; |
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526 if (resizeD < 0) { // cannot resize |
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527 resizeU = -1; // resizeU is tested to check whether resizes are possible |
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528 return true; |
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529 } |
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530 } |
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531 |
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532 return false; // can resize |
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533 } |
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534 /// Resize columns based on findResizeCols |
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535 void resizeCols (wdim diff) |
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536 { |
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537 if (resizeU <= 0) return; |
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538 |
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539 // do shrinking first (in case we hit the minimum) |
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540 if (diff >= 0) { |
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541 diff = -adjustCellSizes (-diff, resizeU, 1); |
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542 adjustCellSizes (diff, resizeD, -1); |
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543 } else { |
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544 diff = -adjustCellSizes (diff, resizeD, -1); |
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545 adjustCellSizes (diff, resizeU, 1); |
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546 } |
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547 } |
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548 |
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549 /** Intitialization triggered by setWidths. |
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550 * |
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551 * Calculates first/lastSizable from sizable, minimal width and positions. */ |
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552 private void initCalc () { |
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553 /* Calculate the minimal width of all columns plus spacing. */ |
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554 mw = spacing * cast(wdim)(minWidth.length - 1); |
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555 foreach (w; minWidth) |
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556 mw += w; |
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557 |
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558 genPositions; |
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559 foreach (i,s; sizable) { |
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560 if (s) { |
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561 firstSizable = i; |
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562 goto gotFirst; |
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563 } |
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564 } |
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565 return; // none resizable - don't search for lastSizable |
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566 gotFirst: |
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567 |
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568 foreach_reverse (i,s; sizable) { |
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569 if (s) { |
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570 lastSizable = i; |
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571 return; // done |
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572 } |
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573 } |
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574 } |
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575 |
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576 /* Generate position infomation for each column and set w. */ |
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577 private void genPositions () { |
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578 pos.length = minWidth.length; |
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579 |
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580 w = 0; |
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581 foreach (i, cw; width) { |
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582 pos[i] = w; |
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583 w += cw + spacing; |
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584 } |
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585 w -= spacing; |
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586 } |
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587 |
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588 /* Adjust the total size of rows/columns (including spacing) by diff. |
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589 * |
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590 * Params: |
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591 * diff = amount to increase/decrease the total size |
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592 * start= index for col/row to start resizing on |
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593 * incr = direction to resize in (added to index each step). Must be either -1 or +1. |
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594 * |
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595 * Returns: |
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596 * The amount adjusted. This may be larger than diff, since cellD is clamped by cellDMin. |
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597 * |
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598 * Note: Check variable used for start is valid before calling! If a non-sizable column's |
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599 * index is passed, this should get increased (if diff > 0) but not decreased. |
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600 */ |
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601 private wdim adjustCellSizes (wdim diff, myDiff start, int incr) |
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602 in { |
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603 assert (width.length == minWidth.length, "CellAlign.adjustCellSizes: width is null (code error)"); |
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604 // Most likely if passed negative when sizing is disabled: |
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605 assert (start >= 0 && start < minWidth.length, "adjustCellSizes: invalid start"); |
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606 debug assert (incr == 1 || incr == -1, "adjustCellSizes: invalid incr"); |
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607 } body { |
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608 debug scope(failure) logger.trace ("adjustCellSizes: failure"); |
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609 myDiff i = start; |
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610 if (diff > 0) { // increase size of first resizable cell |
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611 width[i] += diff; |
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612 foreach (dg; setWidthCb) |
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613 dg(i, width[i], incr); |
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614 } |
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615 else if (diff < 0) { // decrease |
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616 wdim rd = diff; // running diff |
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617 aCSwhile: |
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618 while (true) { |
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619 width[i] += rd; // decrease this cell's size (but may be too much) |
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620 rd = width[i] - minWidth[i]; |
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621 if (rd >= 0) { // OK; we're done |
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622 foreach (dg; setWidthCb) |
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623 dg(i, width[i], incr); |
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624 break; // we hit the mark exactly: diff is correct |
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625 } |
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626 |
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627 // else we decreased it too much! |
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628 width[i] = minWidth[i]; |
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629 foreach (dg; setWidthCb) |
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630 dg(i, width[i], incr); |
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631 // rd is remainder to decrease by |
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632 |
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633 |
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634 bool it = true; // iterate (force first time) |
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635 while (it) { |
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636 i += incr; |
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637 if (i < 0 || i >= minWidth.length) { // run out of next cells |
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638 diff -= rd; // still had rd left to decrease |
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639 break aCSwhile; // exception: Array index out of bounds |
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640 } |
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641 it = !sizable[i]; // iterate again if row/col isn't resizable |
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642 } |
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643 } |
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644 } |
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645 // else no adjustment needed (diff == 0) |
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646 |
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647 genPositions; |
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648 return diff; |
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649 } |
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650 |
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651 /** Minimal width for each column. |
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652 * |
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653 * Initialized to zero. Each class using this AlignColumns should, for each column, increase |
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654 * this value to the maximum of the minimal widths (in other words, set |
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655 * minWidth[i] = max(minWidth[i], cell.minWidth) for each cell in column i). */ |
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656 wdim[] minWidth; // minimal widths (set by genCachedConstructionData) |
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657 |
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658 /** For each column i, sizable[i] is true if that column is resizable. |
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659 * |
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660 * Set along with minWidth before calling setWidths. */ |
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661 bool[] sizable; // set by genCachedConstructionData |
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662 |
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663 /** Current width, relative position (for each column) |
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664 * |
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665 * Treat as READ ONLY! */ |
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666 wdim[] width; // only adjusted within the class |
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667 wdim[] pos; /// ditto |
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668 protected: |
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669 myDiff resizeD, // resizeCols works down from this index (<0 if not resizing) |
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670 resizeU; // and up from this index |
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671 wdim spacing; // used by genPositions (which cannot access the layout class's data) |
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672 wdim spare; // fixed size only: extra blank space filler |
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673 wdim w,mw; // current & minimal widths |
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674 /* indicies of the first/last resizable column (negative if none are resizable). */ |
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675 myDiff firstSizable = -1, lastSizable = -1; // set by calcFLSbl |
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676 // Callbacks used to actually adjust a column's width: |
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677 void delegate (myIt,wdim,int) setWidthCb[]; // set width of a column, with resize direction |
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678 |
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679 static HashMap!(widgetID,AlignColumns) instances; |
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680 static this () { |
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681 instances = new HashMap!(widgetID,AlignColumns); |
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682 } |
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683 } |
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684 |
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685 // Index types. Note that in some cases they need to hold negative values. |
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686 // int is used for resizing direction (although ptrdiff_t would be more appropriate), |
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687 // since the value must always be -1 or +1. |
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688 alias size_t myIt; |
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689 alias ptrdiff_t myDiff; |