Problem
This is in response to Wim Stockman's post titled "Problem with serialize and unserialize on treeview DND (drag-and-drop)".
His application encountered some problem when the drag information contains some french accents such as
Solution
- Store the drag info in some array. In the example below, we use the global array
$drag_data
. - In the drag information
$data
, store the index to this array. - In the
'drag-data-received'
signal handlers, retrieve the index, and get the original data direct from the array. - Using this method, you can store any complex data structures for the drag info, including structures, arrays of arrays, images, etc.
Note: You might want to refer to Jake's comments why the problem occurs.
Sample Code
Important Note: This only works for PHP-GTK2 compliled with gtk+ v2.10 and above. If you are using an older version, for linux, you may follow the step-by-step instructions to recompile php-gtk2 with gtk+ v2.10. For windows, please refer to How to install php gtk2 on windows? You may also want to take a look here to see some of the new exciting PHP-GTK2 Functionalities.
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 45 46 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 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 158 159 160 161 162 163 164 168 169 171 173 174 175 177 178 179 180 182 183 184 185 191 192 193 194 195 197 198 199 200 201 205 206 209 210 213 214 215 216 217 218 220 221 222 | <?php $window = new GtkWindow(); $window->set_title($argv[0]); $window->set_size_request(600, 240); $window->connect_simple('destroy', array('Gtk','main_quit')); $window->add($vbox = new GtkVBox()); // display title $title = new GtkLabel(" Drag and Drop between 2 TreeViews - Part 7\n". "Another method of passing along complex drag info"); $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); $vbox->pack_start($title, 0, 0); $vbox->pack_start(new GtkLabel(''), 0, 0); $vbox->pack_start($hbox = new GtkHBox()); // Set up treeview 1 $data1 = array( array('row0', 'item 42', 2, 3.1), array('row1', 'item 36', 20, 6.21), array('row2', 'item 21', 8, 9.36), array('row3', 'item 10', 11, 12.4), array('row4', 'item 7', 5, 15.5), array('row5', 'item 4', 17, 18.6), array('row6', 'item 3', 20, 21.73)); $view1 = display_table ($hbox, $data1); // setup drag for left side $view1->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $view1->connect('drag-data-get', 'on_drag'); // setup drop for left side $view1->drag_dest_set(Gtk::DEST_DEFAULT_ALL, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $hbox->pack_start(new GtkLabel(' '), 0, 0); // Set up treeview 2 $data2 = array( array('row7', 'item 127', 105, 115.5), array('row8', 'item 124', 117, 118.6), array('row9', 'item 123', 120, 121.73)); $view2 = display_table ($hbox, $data2); // setup drop for right side $view2->drag_dest_set(Gtk::DEST_DEFAULT_ALL, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $view2->connect('drag-data-received', 'on_drop', $view1); // setup drag for right side $view2->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $view2->connect('drag-data-get', 'on_drag'); // this is delayed till here because we need the ID of $view2 $view1->connect('drag-data-received', 'on_drop', $view2); $window->show_all(); Gtk::main(); // display a 2D table in treeview function display_table($container, $data) { // Set up a scroll window $scrolled_win = new GtkScrolledWindow(); $scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC); $container->pack_start($scrolled_win); // Creates the list store if (defined("GObject::TYPE_STRING")) { $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING, GObject::TYPE_LONG, GObject::TYPE_DOUBLE); } else { $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING, Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE); } $field_header = array('Row #', 'Description', 'Qty', 'Price'); $field_justification = array(0.0, 0.0, 0.5, 1.0); // 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'); return $view; } // format treeview columns function format_col($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'; // sets the row color for odd and even rows $cell->set_property('cell-background', $row_color); // sets the background color } // the function that is called when user selects a row function on_selection($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"; } function on_drag($widget, $context, $data, $info, $time) { $selection = $widget->get_selection(); list($model, $iter) = $selection->get_selected(); if ($iter==null) return; $id = $model->get_value($iter, 0); $desc = $model->get_value($iter, 1); $qty = $model->get_value($iter, 2); $price = $model->get_value($iter, 3); global $drag_data; $drag_data['a123'] = array($id, $desc, $qty, $price); // note 1 $data->set_text('a123'); // note 2 } function on_drop($widget, $context, $x, $y, $data, $info, $time, $src_view) { // remove from src first $src_selection = $src_view->get_selection(); list($src_model, $src_iter) = $src_selection->get_selected(); if ($src_iter==null) { return; } $src_model->remove($src_iter); $data_id = $data->data; // note 3 echo "data_id = $data_id\n"; global $drag_data; $data2 = $drag_data[$data_id]; // note 4 print_r($data2); $model = $widget->get_model(); $drop_info = $widget->get_dest_row_at_pos($x, $y); if ($drop_info) { list($path, $position) = $drop_info; if ($position == Gtk::TREE_VIEW_DROP_BEFORE || $position == Gtk::TREE_VIEW_DROP_INTO_OR_BEFORE) { $model->insert($path[0], $data2) ; } else { $model->insert($path[0]+1, $data2) ; } } else { $model->append($data2); } } ?> |
Output
As shown above.
Explanation
We make use of the code from How to drag and drop between 2 GtkTreeViews - Part 4 - in both directions with insert?
What's new here:
- Store the drag info into the array
$drag_data['a123']
. Note that you can use any index for the array. Here I used'a123'
. You can use any index you like. - Store the index of the array (i.e. 'a123') in the drag information
$data
. - Retrieve the index.
- Retrieve the data.
Related Links
- How to drag and drop between 2 GtkTreeViews - Part 1 - left to right?
- How to drag and drop between 2 GtkTreeViews - Part 2 - in both directions?
- How to drag and drop between 2 GtkTreeViews - Part 3 - left to right with insert?
- How to drag and drop between 2 GtkTreeViews - Part 4 - in both directions with insert?
- How to drag and drop between 2 GtkTreeViews - Part 5 - left to right with hints of insert location?
- How to drag and drop between 2 GtkTreeViews - Part 6 - in both directions with hints of insert location?
Read more...