clients: Maximize window when double click on title bar

Signed-off-by: Xiong Zhang <panda0626@gmail.com>
Tested-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

clients/window.c

@@ -365,6 +365,9 @@ struct window_frame {
 	struct widget *widget;
 	struct widget *child;
 	struct frame *frame;
+
+	uint32_t last_time;
+	uint32_t did_double, double_click;
 };
 
 struct menu {
@@ -2340,6 +2343,7 @@ frame_handle_status(struct window_frame *frame, struct input *input,
 	}
 }
 
+#define DOUBLE_CLICK_PERIOD 250
 static void
 frame_button_handler(struct widget *widget,
 		     struct input *input, uint32_t time,
@@ -2350,7 +2354,27 @@ frame_button_handler(struct widget *widget,
 	struct window_frame *frame = data;
 	enum theme_location location;
 
-	location = frame_pointer_button(frame->frame, input, button, state);
+	frame->double_click = 0;
+	if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
+		if (time - frame->last_time <= DOUBLE_CLICK_PERIOD) {
+			frame->double_click = 1;
+			frame->did_double = 1;
+		} else
+			frame->did_double = 0;
+
+		frame->last_time = time;
+	} else if (frame->did_double == 1) {
+		frame->double_click = 1;
+		frame->did_double = 0;
+	}
+
+	if (frame->double_click)
+		location = frame_double_click(frame->frame, input,
+					      button, state);
+	else
+		location = frame_pointer_button(frame->frame, input,
+						button, state);
+
 	frame_handle_status(frame, input, time, location);
 }
 

shared/cairo-util.h

@@ -213,6 +213,10 @@ frame_touch_down(struct frame *frame, void *data, int32_t id, int x, int y);
 void
 frame_touch_up(struct frame *frame, void *data, int32_t id);
 
+enum theme_location
+frame_double_click(struct frame *frame, void *pointer,
+		   uint32_t button, enum frame_button_state state);
+
 void
 frame_repaint(struct frame *frame, cairo_t *cr);
 

shared/frame.c

@@ -837,6 +837,37 @@ frame_touch_up(struct frame *frame, void *data, int32_t id)
 	}
 }
 
+enum theme_location
+frame_double_click(struct frame *frame, void *data,
+		   uint32_t btn, enum frame_button_state state)
+{
+	struct frame_pointer *pointer = frame_pointer_get(frame, data);
+	struct frame_button *button;
+	enum theme_location location = THEME_LOCATION_EXTERIOR;
+
+	location = theme_get_location(frame->theme, pointer->x, pointer->y,
+				      frame->width, frame->height,
+				      frame->flags & FRAME_FLAG_MAXIMIZED ?
+				      THEME_FRAME_MAXIMIZED : 0);
+
+	button = frame_find_button(frame, pointer->x, pointer->y);
+
+	if (location != THEME_LOCATION_TITLEBAR || btn != BTN_LEFT)
+		return location;
+
+	if (state == FRAME_BUTTON_PRESSED) {
+		if (button)
+			frame_button_press(button);
+		else
+			frame->status |= FRAME_STATUS_MAXIMIZE;
+	} else if (state == FRAME_BUTTON_RELEASED) {
+		if (button)
+			frame_button_release(button);
+	}
+
+	return location;
+}
+
 void
 frame_repaint(struct frame *frame, cairo_t *cr)
 {