Sample Code 98: How to create a simple drag and drop image viewer? |
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Written by kksou
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Monday, 20 November 2006 |
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Problem You want to create a simple image viewer that allows users to drag a gif/jpg/png image file from a file explorer and drop it into the image viewer as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 300);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$img = new GtkImage();
$img->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
array( array( 'text/uri-list', 0, 0)), Gdk::ACTION_COPY); // note 1
$img->connect('drag-data-received', 'on_drop', $img); // note 1
$scrolled_win = new GtkScrolledWindow(); // note 2
$scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
$window->add($scrolled_win);
$scrolled_win->add_with_viewport($img); // note 3
$window->show_all();
Gtk::main();
// process drop
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Explanation
- Set up the GtkImage so that it allows users to drop an image onto it.
- Create a scroll window.
- Stuff the img in the scroll window. Note the use of GtkScrolledwindow::add_with_viewport().
- Display the image using the filename "dropped" onto the image viwer.
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February 27, 2008 2:57am
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