Dragdrop documents (#44)

* Allow Drag&Drop from Documents

* Actually ok without

* Drop would fail without permission - mention that case

* also make it translatable

* linter

* also undo the translatable part, leave it to the other PR

Author: teamcons

io.github.wpkelso.slate.yaml

@@ -12,6 +12,8 @@ finish-args:
     - --socket=wayland
     # GPU acceleration if needed
     - --device=dri
+    # Access files dropped from documents
+    - --filesystem=xdg-documents
 
 modules:
     - name: slate

src/Application.vala

@@ -147,7 +147,7 @@ public class Application : Gtk.Application {
             var error_dialog = new
                 Granite.MessageDialog.with_image_from_icon_name (
                         "Couldn't open file",
-                        "The specified file is not a valid text file",
+                        "The specified file is not a valid text file, or Slate could not access it",
                         "dialog-error"
                         ) {
                     transient_for = window

src/Window.vala

@@ -90,6 +90,9 @@ public class AppWindow : Gtk.Window {
         this.close_request.connect (on_close);
         buf.changed.connect (on_buffer_changed);
 
+        var drop_target = new Gtk.DropTarget (typeof (Gdk.FileList), Gdk.DragAction.COPY);
+        text_view.add_controller (drop_target);
+        drop_target.drop.connect (on_dropped);
     }
 
 
@@ -205,4 +208,19 @@ public class AppWindow : Gtk.Window {
 
         return false;
     }
+
+    public bool on_dropped (Gtk.DropTarget target, GLib.Value value, double x, double y) {
+        if (value.type () == typeof (Gdk.FileList)) {
+            var list = (Gdk.FileList)value;
+            File[] file_array = {};
+
+            foreach (unowned var file in list.get_files ()) {
+                file_array += file;
+            }
+
+            application.open (file_array, "");
+            return true;
+        }
+        return false;
+    }
 }