Problem
Suppose you have displayed two lists of thumbnail images using GtkIconView, and you would like to allow users to drag and drop images between the two views.
In Part 1, the dropped image is appended to the end of the dropped view.
In this Part 2, I'll show you how to insert image at the dropped location.
Solution
Use the technique as outlined in the article How to drag and drop between 2 GtkTreeViews - Part 3 - left to right with insert? to insert the dragged image at the dropped location.
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.
Sample Code
The following image files are required by the sample code below. Please save a copy of the image files and put them in the same directory where you store the sample code.
square_red.jpg | |
square_yellow.jpg | |
square_green.jpg | |
square_blue.jpg | |
square_blue2.jpg | |
square_blue3.jpg | |
ball_red.png | |
ball_yellow.png | |
ball_blue3.png | |
ball_blue3a.png | |
ball_green3.png | |
ball_green4.png |
1 2 3 4 7 8 9 10 11 12 13 14 15 16 17 18 19 22 23 26 27 28 29 30 31 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 56 59 60 61 62 63 65 66 67 69 70 71 72 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 92 94 95 96 97 98 99 100 110 111 112 113 116 117 118 119 121 123 124 125 128 129 130 131 132 133 135 136 137 138 139 140 141 143 144 145 146 148 150 151 153 154 156 157 158 160 161 162 | <?php $window = new GtkWindow(); $window->set_title($argv[0]); $window->set_size_request(600, 400); $window->connect_simple('destroy', array('Gtk','main_quit')); $window->add($vbox = new GtkVBox()); // display title $title = new GtkLabel("Drag and drop between two thumbnail images using GtkIconView\n". " Part 2 - Left to right (insert)"); $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); // add a small gap // Set up the two views $hpane = new GtkHPaned(); $vbox->pack_start($hpane); // the thumbnail image lists // 0 = left // 1 = right $imagelist[0] = array('square_red.jpg', 'square_yellow.jpg', 'square_green.jpg', 'square_blue.jpg', 'square_blue2.jpg', 'square_blue3.jpg'); $imagelist[1] = array('ball_red.png', 'ball_yellow.png', 'ball_blue3.png', 'ball_blue3a.png', 'ball_green3.png', 'ball_green4.png',); $left_vbox = setup_iconview(0, 'left'); $right_vbox = setup_iconview(1, 'right'); // setup drag and drop $view[0]->drag_source_set(Gdk::BUTTON1_MASK, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $view[0]->connect('drag-data-get', 'on_drag'); $view[1]->drag_dest_set(Gtk::DEST_DEFAULT_ALL, array( array( 'text/plain', 0, 0)), Gdk::ACTION_COPY|Gdk::ACTION_MOVE); $view[1]->connect('drag-data-received', 'on_drop'); $hpane->add1($left_vbox); $hpane->add2($right_vbox); $view[0]->set_size_request(300, -1); $window->show_all(); Gtk::main(); function setup_iconview($id, $label) { global $imagelist, $model, $modelfilter, $view; $model[$id] = new GtkListStore(GdkPixbuf::gtype, Gtk::TYPE_STRING); foreach($imagelist[$id] as $img) { $pixbuf = GdkPixbuf::new_from_file($img); $model[$id]->append(array($pixbuf, $img)); } $view[$id] = new GtkIconView($model[$id]); $view[$id]->set_pixbuf_column(0); // col 0 of the model $view[$id]->set_text_column(1); // col 1 of the model $view[$id]->set_selection_mode(Gtk::SELECTION_MULTIPLE); $view[$id]->set_columns(0); $view[$id]->set_item_width(120); $vbox = new GtkVBox(); $scrolled_win = new GtkScrolledWindow(); $scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC); $vbox->pack_start($scrolled_win); $scrolled_win->add($view[$id]); return $vbox; } // process drag function on_drag($widget, $context, $data, $info, $time) { $selection = $widget->get_selected_items(); if (count($selection)==0) return; // return if there's no selection $data->set_text(serialize($selection)); } // process drop function on_drop($widget, $context, $x, $y, $data, $info, $time) { // append the dragged item to the destination view $drop_info = $widget->get_dest_item_at_pos($x, $y); // note 1 if ($drop_info) { list($path, $position) = $drop_info; // note 2 $func = 'insert'; if ($position == Gtk::TREE_VIEW_DROP_BEFORE || // note 3 $position == Gtk::TREE_VIEW_DROP_INTO_OR_BEFORE) { $pos = $path[0]; // note 4 } else { $pos = $path[0]+1; // note 5 } } else { $func = 'append'; } global $imagelist; global $model, $modelfilter, $view; $data = unserialize($data->data); $dest_model = $widget->get_model(); $source_model = $view[0]->get_model(); foreach($data as $img) { $i = $img[0]; // remove the source image first $iter = $model[0]->get_iter($i); $img_name = $model[0]->get_value($iter, 1); $model[0]->remove($iter); // append the dragged image to the destination $pixbuf = GdkPixbuf::new_from_file($img_name); if ($func=='append') { $dest_model->append(array($pixbuf, $img_name)); // note 6 } elseif ($func = 'insert') { $dest_model->insert($pos, array($pixbuf, $img_name)); // note 7 } } } ?> |
Output
As shown above.
Explanation
The above sample code is based on Part 1.
We also make use of the code from How to drag and drop between 2 GtkTreeViews - Part 3 - left to right with insert? to insert the dragged image at the dropped location.
What's new here:
- Get the drop information.
- Get the path and position of the drop information.
- Check whether it's on, before or after the row.
- If it's on or before, we insert into the current row.
- If it's after, we insert into the next row (i.e. current_row + 1).
- Append the dragged image.
- Insert the dragged image at the dropped location.
Related Links
- How to drag and drop between two thumbnail images using GtkIconView - Part 1 - left to right append?
- How to drag and drop between two thumbnail images using GtkIconView - Part 3 - both directions with insert?
- How to display a list of thumbnail images using GtkIconView?
- How to select thumbnail images with drag and drop using GtkIconView - Part 1 - left to right?
- How to select thumbnail images with drag and drop using GtkIconView - Part 2 - in both directions?
- 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?
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