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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
//
// DragAndDropHandler attaches signals to a Page to properly handle drag-and-drop requests for the
// Page as a DnD Source. (DnD Destination handling is handled by the appropriate AppWindow, i.e.
// LibraryWindow and DirectWindow). Assumes the Page's ViewCollection holds MediaSources.
//
public class DragAndDropHandler {
private enum TargetType {
XDS,
MEDIA_LIST
}
private const Gtk.TargetEntry[] SOURCE_TARGET_ENTRIES = {
{ "XdndDirectSave0", Gtk.TargetFlags.OTHER_APP, TargetType.XDS },
{ "shotwell/media-id-atom", Gtk.TargetFlags.SAME_APP, TargetType.MEDIA_LIST }
};
private static Gdk.Atom? XDS_ATOM = null;
private static Gdk.Atom? TEXT_ATOM = null;
private static uint8[]? XDS_FAKE_TARGET = null;
private weak Page page;
private Gtk.Widget event_source;
private File? drag_destination = null;
private ExporterUI exporter = null;
public DragAndDropHandler(Page page) {
this.page = page;
this.event_source = page.get_event_source();
assert(event_source != null);
assert(event_source.get_has_window());
// Need to do this because static member variables are not properly handled
if (XDS_ATOM == null)
XDS_ATOM = Gdk.Atom.intern_static_string("XdndDirectSave0");
if (TEXT_ATOM == null)
TEXT_ATOM = Gdk.Atom.intern_static_string("text/plain");
if (XDS_FAKE_TARGET == null)
XDS_FAKE_TARGET = string_to_uchar_array("shotwell.txt");
// register what's available on this DnD Source
Gtk.drag_source_set(event_source, Gdk.ModifierType.BUTTON1_MASK, SOURCE_TARGET_ENTRIES,
Gdk.DragAction.COPY);
// attach to the event source's DnD signals, not the Page's, which is a NO_WINDOW widget
// and does not emit them
event_source.drag_begin.connect(on_drag_begin);
event_source.drag_data_get.connect(on_drag_data_get);
event_source.drag_end.connect(on_drag_end);
event_source.drag_failed.connect(on_drag_failed);
}
~DragAndDropHandler() {
if (event_source != null) {
event_source.drag_begin.disconnect(on_drag_begin);
event_source.drag_data_get.disconnect(on_drag_data_get);
event_source.drag_end.disconnect(on_drag_end);
event_source.drag_failed.disconnect(on_drag_failed);
}
page = null;
event_source = null;
}
private void on_drag_begin(Gdk.DragContext context) {
debug("on_drag_begin (%s)", page.get_page_name());
if (page == null || page.get_view().get_selected_count() == 0 || exporter != null)
return;
drag_destination = null;
// use the first media item as the icon
ThumbnailSource thumb = (ThumbnailSource) page.get_view().get_selected_at(0).get_source();
try {
Gdk.Pixbuf icon = thumb.get_thumbnail(AppWindow.DND_ICON_SCALE);
Gtk.drag_source_set_icon_pixbuf(event_source, icon);
} catch (Error err) {
warning("Unable to fetch icon for drag-and-drop from %s: %s", thumb.to_string(),
err.message);
}
// set the XDS property to indicate an XDS save is available
Gdk.property_change(context.get_source_window(), XDS_ATOM, TEXT_ATOM, 8, Gdk.PropMode.REPLACE,
XDS_FAKE_TARGET, 1);
}
private void on_drag_data_get(Gdk.DragContext context, Gtk.SelectionData selection_data,
uint target_type, uint time) {
debug("on_drag_data_get (%s)", page.get_page_name());
if (page == null || page.get_view().get_selected_count() == 0)
return;
switch (target_type) {
case TargetType.XDS:
// Fetch the XDS property that has been set with the destination path
uchar[] data = new uchar[4096];
Gdk.Atom actual_type;
int actual_format = 0;
bool fetched = Gdk.property_get(context.get_source_window(), XDS_ATOM, TEXT_ATOM,
0, data.length, 0, out actual_type, out actual_format, out data);
// the destination path is actually for our XDS_FAKE_TARGET, use its parent
// to determine where the file(s) should go
if (fetched && data != null && data.length > 0)
drag_destination = File.new_for_uri(uchar_array_to_string(data)).get_parent();
debug("on_drag_data_get (%s): %s", page.get_page_name(),
(drag_destination != null) ? drag_destination.get_path() : "(no path)");
// Set the property to "S" for Success or "E" for Error
selection_data.set(XDS_ATOM, 8,
string_to_uchar_array((drag_destination != null) ? "S" : "E"));
break;
case TargetType.MEDIA_LIST:
Gee.Collection<MediaSource> sources =
(Gee.Collection<MediaSource>) page.get_view().get_selected_sources();
// convert the selected media sources to Gdk.Atom-encoded sourceID strings for
// internal drag-and-drop
selection_data.set(Gdk.Atom.intern_static_string("SourceIDAtom"), (int) sizeof(Gdk.Atom),
serialize_media_sources(sources));
break;
default:
warning("on_drag_data_get (%s): unknown target type %u", page.get_page_name(),
target_type);
break;
}
}
private void on_drag_end() {
debug("on_drag_end (%s)", page.get_page_name());
if (page == null || page.get_view().get_selected_count() == 0 || drag_destination == null
|| exporter != null) {
return;
}
debug("Exporting to %s", drag_destination.get_path());
// drag-and-drop export doesn't pop up an export dialog, so use what are likely the
// most common export settings (the current -- or "working" -- file format, with
// all transformations applied, at the image's original size).
if (drag_destination.get_path() != null) {
exporter = new ExporterUI(new Exporter(
(Gee.Collection<Photo>) page.get_view().get_selected_sources(),
drag_destination, Scaling.for_original(), ExportFormatParameters.current()));
exporter.export(on_export_completed);
} else {
AppWindow.error_message(_("Photos cannot be exported to this directory."));
}
drag_destination = null;
}
private bool on_drag_failed(Gdk.DragContext context, Gtk.DragResult drag_result) {
debug("on_drag_failed (%s): %d", page.get_page_name(), (int) drag_result);
if (page == null)
return false;
drag_destination = null;
return false;
}
private void on_export_completed() {
exporter = null;
}
}
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