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/*
* Copyright (c) 2015-2017 elementary LLC (http://launchpad.net/elementary)
* NOTE: This is an adaptation of the DndHandler class from elementary Files project.
* Copyright (c) 2017-2019 José Amuedo (https://github.com/spheras)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Jeremy Wootten <jeremy@elementaryos.org>
*/
namespace DesktopFolder.DragnDrop {
public class DndHandler : GLib.Object {
Gdk.DragAction chosen = Gdk.DragAction.DEFAULT;
/** singlenton instance */
private static DndHandler dnd_handler = null;
/**
* @constructor
* @description private constructor for singlenton
*/
private DndHandler () {
}
/**
* @name get_instance
* @description singlenton pattern
*/
public static DndHandler get_instance () {
if (dnd_handler == null) {
dnd_handler = new DndHandler ();
}
return dnd_handler;
}
public bool dnd_perform (Gtk.Widget widget,
DndView drop_target,
GLib.List <GLib.File> drop_file_list,
Gdk.DragAction action) {
// debug("DndHandler-dnd_perform!!!");
/*
debug("size:%d",(int)drop_file_list.length());
debug("file:"+drop_file_list.nth(0).data.get_basename());
*/
if (drop_target.is_folder ()) {
DesktopFolder.DragnDrop.Util.copy_move (drop_file_list,
drop_target.get_target_location (),
action,
widget,
null,
null);
return true;
}
return false;
}
public Gdk.DragAction ? drag_drop_action_ask (Gtk.Widget dest_widget,
Gtk.ApplicationWindow win,
Gdk.DragAction possible_actions) {
// debug("DndHandler-drag_drop_action_ask!!!");
this.chosen = Gdk.DragAction.DEFAULT;
add_action (win);
var ask_menu = build_menu (possible_actions);
ask_menu.set_screen (dest_widget.get_screen ());
ask_menu.show_all ();
var loop = new GLib.MainLoop (null, false);
ask_menu.deactivate.connect (() => {
if (loop.is_running ())
loop.quit ();
remove_action (win);
});
ask_menu.popup_at_pointer (null);
loop.run ();
Gtk.grab_remove (ask_menu);
return this.chosen;
}
private void add_action (Gtk.ApplicationWindow win) {
// debug("DndHandler-add_action!!!");
var action = new GLib.SimpleAction ("choice", GLib.VariantType.STRING);
action.activate.connect (this.on_choice);
win.add_action (action);
}
private void remove_action (Gtk.ApplicationWindow win) {
// debug("DndHandler-remove_action!!!");
win.remove_action ("choice");
}
private Gtk.Menu build_menu (Gdk.DragAction possible_actions) {
// debug("DndHandler-build_menu!!!");
var menu = new Gtk.Menu ();
build_and_append_menu_item (menu, DesktopFolder.Lang.DROP_MENU_MOVE, Gdk.DragAction.MOVE, possible_actions);
build_and_append_menu_item (menu, DesktopFolder.Lang.DROP_MENU_COPY, Gdk.DragAction.COPY, possible_actions);
build_and_append_menu_item (menu, DesktopFolder.Lang.DROP_MENU_LINK, Gdk.DragAction.LINK, possible_actions);
menu.append (new Gtk.SeparatorMenuItem ());
menu.append (new Gtk.MenuItem.with_label (DesktopFolder.Lang.DROP_MENU_CANCEL));
return menu;
}
private void build_and_append_menu_item (Gtk.Menu menu, string label, Gdk.DragAction ? action, Gdk.DragAction possible_actions) {
// debug("DndHandler-build_and_append_menu_item!!!");
if ((possible_actions & action) != 0) {
var item = new Gtk.MenuItem.with_label (label);
item.activate.connect (() => {
this.chosen = action;
});
menu.append (item);
}
}
public void on_choice (GLib.Variant ? param) {
// debug("DndHandler-on_choice!!!");
if (param == null || !param.is_of_type (GLib.VariantType.STRING)) {
critical ("Invalid variant type in DndHandler Menu");
return;
}
string choice = param.get_string ();
switch (choice) {
case "move":
this.chosen = Gdk.DragAction.MOVE;
break;
case "copy":
this.chosen = Gdk.DragAction.COPY;
break;
case "link":
this.chosen = Gdk.DragAction.LINK;
break;
case "background": /* not implemented yet */
case "cancel":
default:
this.chosen = Gdk.DragAction.DEFAULT;
break;
}
}
public string ? get_source_filename (Gdk.DragContext context) {
// debug("DndHandler-get_source_filename!!!");
uchar[] ? data = null;
Gdk.Atom property_name = Gdk.Atom.intern_static_string ("XdndDirectSave0");
Gdk.Atom property_type = Gdk.Atom.intern_static_string ("text/plain");
bool exists = Gdk.property_get (context.get_source_window (),
property_name,
property_type,
0, /* offset into property to start getting */
1024, /* max bytes of data to retrieve */
0, /* do not delete after retrieving */
null, null, /* actual property type and format got disregarded */
out data
);
if (exists && data != null) {
string name = DndHandler.data_to_string (data);
if (GLib.Path.DIR_SEPARATOR.to_string () in name) {
warning ("invalid source filename");
return null; /* not a valid filename */
} else
return name;
} else {
warning ("source file does not exist");
return null;
}
}
public void set_source_uri (Gdk.DragContext context, string uri) {
// debug("DndHandler-set_source_uri!!!");
// debug ("DNDHANDLER: set source uri to %s", uri);
Gdk.Atom property_name = Gdk.Atom.intern_static_string ("XdndDirectSave0");
Gdk.Atom property_type = Gdk.Atom.intern_static_string ("text/plain");
Gdk.property_change (context.get_source_window (),
property_name,
property_type,
8,
Gdk.PropMode.REPLACE,
uri.data,
uri.length);
}
public bool handle_xdnddirectsave (Gdk.DragContext context,
DragnDrop.DndView drop_target,
Gtk.SelectionData selection) {
// debug("DndHandler-handle_xdnddirectsave!!!");
bool success = false;
if (selection.get_length () == 1 && selection.get_format () == 8) {
uchar result = selection.get_data ()[0];
switch (result) {
case 'F':
/* No fallback for XdndDirectSave stage (3), result "F" ("Failed") yet */
break;
case 'E':
/* No fallback for XdndDirectSave stage (3), result "E" ("Error") yet.
* Note this result may be obtained even if the file was successfully saved */
break;
case 'S':
/* XdndDirectSave "Success" */
success = true;
break;
default:
warning ("Unhandled XdndDirectSave result %s", result.to_string ());
break;
}
}
if (!success)
set_source_uri (context, "");
return success;
}
public bool handle_netscape_url (Gdk.DragContext context, DragnDrop.DndView drop_target, Gtk.SelectionData selection) {
// debug("DndHandler-handle_netscape_url!!!");
string[] parts = (selection.get_text ()).split ("\n");
/* _NETSCAPE_URL looks like this: "$URL\n$TITLE" - should be 2 parts */
if (parts.length != 2)
return false;
/* NETSCAPE URLs are not currently handled. No current bug reports */
return false;
}
public bool handle_file_drag_actions (Gtk.Widget dest_widget,
Gtk.ApplicationWindow win,
Gdk.DragContext context,
DragnDrop.DndView drop_target,
GLib.List <GLib.File> drop_file_list,
Gdk.DragAction possible_actions,
Gdk.DragAction suggested_action,
uint32 timestamp) {
// debug("DndHandler-handle_file_drag_actions!!!");
bool success = false;
Gdk.DragAction action = suggested_action;
if (drop_file_list != null) {
if ((possible_actions & Gdk.DragAction.ASK) != 0) {
action = drag_drop_action_ask (dest_widget, win, possible_actions);
}
if (action != Gdk.DragAction.DEFAULT) {
success = dnd_perform (dest_widget,
drop_target,
drop_file_list,
action);
}
} else {
critical ("Attempt to drop null file list");
}
return success;
}
public static bool selection_data_is_uri_list (Gtk.SelectionData selection_data, uint info, out string ? text) {
text = null;
// debug("DndHandler-selection_data_is_uri_list!!!");
if (info == TargetType.TEXT_URI_LIST &&
selection_data.get_format () == 8 &&
selection_data.get_length () > 0) {
text = DndHandler.data_to_string (selection_data.get_data_with_length ());
}
// debug ("DNDHANDLER selection data is uri list returning %s", (text != null).to_string ());
return (text != null);
}
public static string data_to_string (uchar[] cdata) {
// debug("DndHandler-data_to_string!!!");
var sb = new StringBuilder ("");
foreach (uchar u in cdata) {
sb.append_c ((char) u);
}
return sb.str;
}
public static void set_selection_data_from_file_list (Gtk.SelectionData selection_data,
GLib.List <DndView> file_list,
string prefix = "") {
// debug("DndHandler-set_selection_data_from_file_list!!!");
GLib.StringBuilder sb = new GLib.StringBuilder (prefix);
if (file_list != null && file_list.data != null && file_list.data is DragnDrop.DndView) {
bool in_recent = file_list.data.is_recent_uri_scheme ();
file_list.@foreach ((file) => {
var target = in_recent ? file.get_display_target_uri () : file.get_target_location ().get_uri ();
// debug("target->%s",target);
sb.append (target);
sb.append ("\r\n"); /* Drop onto Filezilla does not work without the "\r" */
});
} else {
warning ("Invalid file list for drag and drop ignored");
}
selection_data.@set (selection_data.get_target (),
8,
sb.data);
}
public static void set_selection_data_from_file_list_2 (Gtk.SelectionData selection_data,
GLib.List <DragnDrop.DndView> file_list,
string prefix = "") {
// debug("DndHandler-set_selection_data_from_file_list!!!");
GLib.StringBuilder sb = new GLib.StringBuilder (prefix);
if (file_list != null && file_list.data != null && file_list.data is DragnDrop.DndView) {
bool in_recent = true; // file_list.data.is_recent_uri_scheme ();
file_list.@foreach ((file) => {
var target = in_recent ? Util.get_display_target_uri (file.get_file ()) : file.get_file ().get_uri ();
// debug("target->%s",target);
sb.append (target);
sb.append ("\r\n"); /* Drop onto Filezilla does not work without the "\r" */
});
} else {
warning ("Invalid file list for drag and drop ignored");
}
selection_data.@set (selection_data.get_target (),
8,
sb.data);
}
}
}
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