Add double click gesture on image bubbles to open

src/transcript/transcript-drawing-area.vala

@@ -16,8 +16,9 @@ private class TranscriptDrawingArea : Widget
         }
     }
 
-    public signal void on_text_bubble_hover(VisibleTextLayout? text_bubble);
-    public signal void on_text_bubble_click(VisibleTextLayout? text_bubble);
+    public signal void on_text_bubble_hover(VisibleLayout? text_bubble);
+    public signal void on_text_bubble_click(VisibleLayout? text_bubble);
+    public signal void on_image_bubble_activate(string attachment_guid);
 
     private ArrayList<Message> _messages = new ArrayList<Message>();
     private ArrayList<ChatItemLayout> _chat_items = new ArrayList<ChatItemLayout>();
@@ -29,7 +30,7 @@ private class TranscriptDrawingArea : Widget
     private Gdk.Rectangle? _click_bounding_box = null;
 
     private EventControllerMotion _motion_controller = new EventControllerMotion();
-    private ArrayList<VisibleTextLayout?> _visible_text_layouts = new ArrayList<VisibleTextLayout?>();
+    private ArrayList<VisibleLayout?> _visible_text_layouts = new ArrayList<VisibleLayout?>();
 
     private const bool debug_viewport = false;
     private uint? _tick_callback_id = null;
@@ -41,8 +42,8 @@ private class TranscriptDrawingArea : Widget
         weak TranscriptDrawingArea self = this;
 
         _click_gesture.button = 0;
-        _click_gesture.begin.connect(() => {
-            self.on_click(self._click_gesture.get_current_button());
+        _click_gesture.pressed.connect((n_press, x, y) => {
+            self.on_click(self._click_gesture.get_current_button(), n_press);
         });
         add_controller(_click_gesture);
 
@@ -157,8 +158,8 @@ private class TranscriptDrawingArea : Widget
             // Skip drawing if this item is not in the viewport
             float height_offset = 0.0f;
             if (viewport_rect.intersection(rect, null)) {
-                if (chat_item is TextBubbleLayout) {
-                    _visible_text_layouts.add(VisibleTextLayout(chat_item as TextBubbleLayout, rect));
+                if (chat_item is BubbleLayout) {
+                    _visible_text_layouts.add(VisibleLayout(chat_item as BubbleLayout, rect));
                 }
 
                 snapshot.save();
@@ -199,9 +200,10 @@ private class TranscriptDrawingArea : Widget
         animation_tick();
     }
 
-    private VisibleTextLayout? get_text_bubble_at(double x, double y) {
+    private VisibleLayout? get_visible_layout_at(double x, double y) {
+        var point = Graphene.Point() { x = (float)x, y = (float)y };
         foreach (var layout in _visible_text_layouts) {
-            if (layout.rect.contains_point(Graphene.Point() { x = (float)x, y = (float)y })) {
+            if (layout.rect.contains_point(point)) {
                 return layout;
             }
         }
@@ -209,16 +211,29 @@ private class TranscriptDrawingArea : Widget
         return null;
     }
 
+    private VisibleLayout? get_text_bubble_at(double x, double y) {
+        var layout = get_visible_layout_at(x, y);
+        if (layout != null && layout.bubble is TextBubbleLayout) {
+            return layout;
+        }
+
+        return null;
+    }
+
     private void on_mouse_motion(double x, double y) {
-        VisibleTextLayout? hovered_text_bubble = get_text_bubble_at(x, y);
+        VisibleLayout? hovered_text_bubble = get_text_bubble_at(x, y);
         on_text_bubble_hover(hovered_text_bubble);
     }
 
-    private void on_click(uint button) {
+    private void on_click(uint button, int n_press) {
         if (button == Gdk.BUTTON_SECONDARY) {
             on_right_click();
         } else if (button == Gdk.BUTTON_PRIMARY) {
             on_left_click();
+
+            if (n_press == 2) {
+                on_double_click();
+            }
         }
     }
 
@@ -230,6 +245,17 @@ private class TranscriptDrawingArea : Widget
         }
     }
 
+    private void on_double_click() {
+        Gdk.Rectangle? bounding_box = null;
+        if (_click_gesture.get_bounding_box(out bounding_box)) {
+            var double_clicked_bubble = get_visible_layout_at(bounding_box.x, bounding_box.y);
+            if (double_clicked_bubble != null && double_clicked_bubble.bubble is ImageBubbleLayout) {
+                var image_bubble = double_clicked_bubble.bubble as ImageBubbleLayout;
+                on_image_bubble_activate(image_bubble.attachment_guid);
+            }
+        }
+    }
+
     private void on_right_click() {
         var menu_model = new Menu();
         menu_model.append("Copy", "transcript.copy");
@@ -346,6 +372,8 @@ private class TranscriptDrawingArea : Widget
 
                 var image_layout = new ImageBubbleLayout(attachment.preview_path, message.from_me, this, max_width, image_size);
                 image_layout.id = @"image-$(attachment.guid)";
+                image_layout.attachment_guid = attachment.guid;
+
                 if (animate) {
                     start_animation(image_layout.id);
                 }
@@ -410,12 +438,12 @@ private class ChatItemAnimation
     }
 }
 
-public struct VisibleTextLayout {
-    public weak TextBubbleLayout text_bubble;
+public struct VisibleLayout {
+    public weak BubbleLayout bubble;
     public Graphene.Rect rect;
 
-    public VisibleTextLayout(TextBubbleLayout text_bubble, Graphene.Rect rect) {
-        this.text_bubble = text_bubble;
+    public VisibleLayout(BubbleLayout bubble, Graphene.Rect rect) {
+        this.bubble = bubble;
         this.rect = rect;
     }
 }