Problem
In Part 1, you have used a GtkTreeModelSort to sort and retrieve the sorted rows.
Instead of using one GtkTreeModelSort, you can use multiple GtkTreeModelSort's as shown below.
Solution
- In this example, we create four GtkTreeModelSort's on top of the original model.
- Each time the user wants to change the sorting order, we simply switch to a different modelsort using GtkCellview::set_model()
Sample Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 165 166 167 168 169 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 190 191 192 193 194 195 201 202 203 204 208 209 210 211 212 213 214 215 216 217 218 220 221 222 223 225 227 228 230 231 233 234 236 237 239 240 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 | <?php $window = new GtkWindow(); $window->set_size_request(400, 312); $window->connect_simple('destroy', array('Gtk','main_quit')); $window->add($vbox = new GtkVBox()); $accel_group = new GtkAccelGroup(); $window->add_accel_group($accel_group); // define menu definition $menu_definition = array( '_File' => array('_Quit|Q'), '_Sort By' => array('Row#|0', 'Description|1', 'Qty|2', 'Price|3'), 'Output' => array('Output Sorted Data|W') ); setup_menu($vbox, $menu_definition); // display title $title = new GtkLabel("Output Sorted Model in Treeview - Part 2\n". "Use multiple GtkTreeModelSort"); $title->modify_font(new PangoFontDescription("Times New Roman Italic 10")); $title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff")); $title->set_size_request(-1, 40); $title->set_justify(Gtk::JUSTIFY_CENTER); $alignment = new GtkAlignment(0.5, 0.5, 0, 0); $alignment->add($title); $vbox->pack_start($alignment, 0, 0); $vbox->pack_start(new GtkLabel("Ctrl-0: sort by row #\n". "Ctrl-1: sort by Description\n". "Ctrl-2: sort by Qty\n". "Ctrl-3: sort by Price\n". "Ctrl-W: output sorted model"), 0, 0); $vbox->pack_start(new GtkLabel(), 0, 0); // add a small gap // the 2D table $data = array( array('row0', 'item 42', 2, 3.1, 1), array('row1', 'item 36', 20, 6.21, 1), array('row2', 'item 21', 8, 9.36, 1), array('row3', 'item 10', 11, 12.4, 1), array('row4', 'item 7', 5, 15.5, 1), array('row5', 'item 4', 17, 18.6, 1), array('row6', 'item 3', 20, 21.73, 1)); display_table ($vbox, $data); $window->show_all(); Gtk::main(); function display_table($vbox, $data) { // Set up a scroll window $scrolled_win = new GtkScrolledWindow(); $scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC); $vbox->pack_start($scrolled_win); // Creates the list store global $model, $view; if (defined("GObject::TYPE_STRING")) { $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING, GObject::TYPE_LONG, GObject::TYPE_DOUBLE, GObject::TYPE_BOOLEAN); } else { $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING, Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE, Gtk::TYPE_BOOLEAN); } $field_header = array('Row #', 'Description', 'Qty', 'Price'); $field_justification = array(0.0, 0.0, 0.5, 1.0); // setup GtkTreeModelSort's global $modelsort0, $modelsort1, $modelsort2, $modelsort3; $modelsort0 = new GtkTreeModelSort($model); // note 1 $modelsort0->set_sort_column_id(0, Gtk::SORT_ASCENDING); $modelsort1 = new GtkTreeModelSort($model); // note 1 $modelsort1->set_sort_column_id(1, Gtk::SORT_ASCENDING); $modelsort2 = new GtkTreeModelSort($model); // note 1 $modelsort2->set_sort_column_id(2, Gtk::SORT_ASCENDING); $modelsort3 = new GtkTreeModelSort($model); // note 1 $modelsort3->set_sort_column_id(3, Gtk::SORT_ASCENDING); // Creates the view to display the list store $view = new GtkTreeView($model); $scrolled_win->add($view); // Creates the columns for ($col=0; $col<count($field_header); ++$col) { $cell_renderer = new GtkCellRendererText(); $cell_renderer->set_property("xalign", $field_justification[$col]); $column = new GtkTreeViewColumn($field_header[$col], $cell_renderer, 'text', $col); $column->set_alignment($field_justification[$col]); $column->set_sort_column_id($col); // set the header font and color $label = new GtkLabel($field_header[$col]); $label->modify_font(new PangoFontDescription("Arial Bold")); $label->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000FF")); $column->set_widget($label); $label->show(); // setup self-defined function to display alternate row color $column->set_cell_data_func($cell_renderer, "format_col", $col); $view->append_column($column); } // pupulates the data for ($row=0; $row<count($data); ++$row) { $values = array(); for ($col=0; $col<count($data[$row]); ++$col) { $values[] = $data[$row][$col]; } $model->append($values); } // setup selection $selection = $view->get_selection(); $selection->connect('changed', 'on_selection'); } // self-defined function to format the price column function format_col($column, $cell, $model, $iter, $col_num) { $path = $model->get_path($iter); // get the current path $row_num = $path[0]; // get the row number if ($col_num==3) { $amt = $model->get_value($iter, 3); $cell->set_property('text', '$'.number_format($amt,2)); } $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff'; $cell->set_property('cell-background', $row_color); } // the function that is called when user selects a row function on_selection($selection) { list($model, $iter) = $selection->get_selected(); if ($iter==NULL) return; $desc = $model->get_value($iter, 1); $qty = $model->get_value($iter, 2); $price = $model->get_value($iter, 3); print "You have selected $desc: $qty ($price)\n"; } // setup menu function setup_menu($vbox, $menus) { global $accel_group; $menubar = new GtkMenuBar(); $vbox->pack_start($menubar, 0, 0); foreach($menus as $toplevel => $sublevels) { $menubar->append($top_menu = new GtkMenuItem($toplevel)); $menu = new GtkMenu(); $top_menu->set_submenu($menu); foreach($sublevels as $submenu) { if (strpos("$submenu", '|') === false) { $accel_key = ''; } else { list($submenu, $accel_key) = explode('|', $submenu); } if (is_array($submenu)) { // set up radio menus $i=0; $radio[0] = null; foreach($submenu as $radio_item) { $radio[$i] = new GtkRadioMenuItem($radio[0], $radio_item); $radio[$i]->connect('toggled', "on_toggle"); $menu->append($radio[$i]); ++$i; } $radio[0]->set_active(1); // select the first item } else { if ($submenu=='<hr>') { $menu->append(new GtkSeparatorMenuItem()); } else { $submenu2 = str_replace('_', '', $submenu); $submenu2 = str_replace(' ', '_', $submenu2); $stock_image_name = 'Gtk::STOCK_'.strtoupper($submenu2); if (defined($stock_image_name)) { $menu_item = new GtkImageMenuItem( constant($stock_image_name)); } else { $menu_item = new GtkMenuItem($submenu); } if ($accel_key!='') { $menu_item->add_accelerator("activate", $accel_group, ord($accel_key), Gdk::CONTROL_MASK, 1); } $menu->append($menu_item); $menu_item->connect('activate', 'on_menu_select'); } } } } } function on_menu_select($menu_item) { global $view; global $modelsort0, $modelsort1, $modelsort2, $modelsort3; $item = $menu_item->child->get_label(); echo "menu selected: $item\n"; if ($item=='_Quit') { Gtk::main_quit(); return false; } elseif ($item=='Row#') { $view->set_model($modelsort0); // note 2 } elseif ($item=='Description') { $view->set_model($modelsort1); // note 2 } elseif ($item=='Qty') { $view->set_model($modelsort2); // note 2 } elseif ($item=='Price') { $view->set_model($modelsort3); // note 2 } elseif ($item=='Output Sorted Data') { output_model(); } } function output_model() { global $view; $model = $view->get_model(); // note 3 $n = $model->iter_n_children(NULL); for ($i=0; $i<$n; ++$i) { $iter = $model->get_iter($i); $row_no = $model->get_value($iter, 0); $desc = $model->get_value($iter, 1); $qty = $model->get_value($iter, 2); $price = $model->get_value($iter, 3); echo "$i: $row_no ($desc) qty=$qty price=$price\n"; } } ?> |
Output
As shown above.Explanation
We make use of the code from Part 1.
What's new here:
- Create four GtkTreeModelSort's on top of the original model.
- Switch to the corresponding modelsort based on user's selection.
- Output the sorted rows of the existing model.
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