[PATCH weston v2 5/5] shared/frame: fix frame buttons for touchscreen

[Stanislav Vorobiov]

support frame buttons hovering with touchscreen and
cancel button press if a touch was not released over
the button that was pressed
---
 clients/window.c    |   14 ++++++++++++++
 shared/cairo-util.h |    3 +++
 shared/frame.c      |   44 ++++++++++++++++++++++++++++++++++++++------
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/clients/window.c b/clients/window.c
index be2c0e0..ecb90c0 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -2426,6 +2426,19 @@ frame_touch_up_handler(struct widget *widget,
 	frame_handle_status(frame, input, time, THEME_LOCATION_CLIENT_AREA);
 }
 
+static void
+frame_touch_motion_handler(struct widget *widget,
+			   struct input *input,
+			   uint32_t time, int32_t id, float x, float y,
+			   void *data)
+{
+	struct window_frame *frame = data;
+
+	frame_touch_motion(frame->frame, input, x, y);
+	if (frame_status(frame->frame) & FRAME_STATUS_REPAINT)
+		widget_schedule_redraw(frame->widget);
+}
+
 struct widget *
 window_frame_create(struct window *window, void *data)
 {
@@ -2453,6 +2466,7 @@ window_frame_create(struct window *window, void *data)
 	widget_set_button_handler(frame->widget, frame_button_handler);
 	widget_set_touch_down_handler(frame->widget, frame_touch_down_handler);
 	widget_set_touch_up_handler(frame->widget, frame_touch_up_handler);
+	widget_set_touch_motion_handler(frame->widget, frame_touch_motion_handler);
 
 	window->frame = frame;
 
diff --git a/shared/cairo-util.h b/shared/cairo-util.h
index 9643023..70f62a6 100644
--- a/shared/cairo-util.h
+++ b/shared/cairo-util.h
@@ -211,6 +211,9 @@ void
 frame_touch_up(struct frame *frame, void *data, int32_t id);
 
 void
+frame_touch_motion(struct frame *frame, void *data, int x, int y);
+
+void
 frame_repaint(struct frame *frame, cairo_t *cr);
 
 #endif
diff --git a/shared/frame.c b/shared/frame.c
index 833117c..d0430a7 100644
--- a/shared/frame.c
+++ b/shared/frame.c
@@ -77,6 +77,7 @@ struct frame_touch {
 
 	int x, y;
 
+	struct frame_button *hover_button;
 	struct frame_button *button;
 };
 
@@ -789,7 +790,7 @@ frame_touch_down(struct frame *frame, void *data, int32_t id, int x, int y)
 	struct frame_button *button = frame_find_button(frame, x, y);
 	enum theme_location location = THEME_LOCATION_EXTERIOR;
 
-	if (id > 0)
+	if (!touch || (id > 0))
 		return location;
 
 	location = theme_get_location(frame->theme, x, y,
@@ -797,8 +798,9 @@ frame_touch_down(struct frame *frame, void *data, int32_t id, int x, int y)
 				      frame->flags & FRAME_FLAG_MAXIMIZED ?
 				      THEME_FRAME_MAXIMIZED : 0);
 
-	if (touch && button) {
-		touch->button = button;
+	if (button) {
+		touch->hover_button = touch->button = button;
+		frame_button_enter(touch->button);
 		frame_button_press(touch->button);
 		return location;
 	}
@@ -829,16 +831,46 @@ frame_touch_up(struct frame *frame, void *data, int32_t id)
 {
 	struct frame_touch *touch = frame_touch_get(frame, data);
 
-	if (id > 0)
+	if (!touch || (id > 0))
 		return;
 
-	if (touch && touch->button) {
-		frame_button_release(touch->button);
+	if (touch->hover_button)
+		frame_button_leave(touch->hover_button, NULL);
+
+	if (touch->button) {
+		if (touch->button == touch->hover_button)
+			frame_button_release(touch->button);
+		else
+			frame_button_cancel(touch->button);
 		frame_touch_destroy(touch);
 	}
 }
 
 void
+frame_touch_motion(struct frame *frame, void *data, int x, int y)
+{
+	struct frame_touch *touch = frame_touch_get(frame, data);
+	struct frame_button *button = frame_find_button(frame, x, y);
+
+	if (!touch)
+		return;
+
+	touch->x = x;
+	touch->y = y;
+
+	if (touch->hover_button == button)
+		return;
+
+	if (touch->hover_button)
+		frame_button_leave(touch->hover_button, NULL);
+
+	touch->hover_button = button;
+
+	if (touch->hover_button)
+		frame_button_enter(touch->hover_button);
+}
+
+void
 frame_repaint(struct frame *frame, cairo_t *cr)
 {
 	struct frame_button *button;
-- 
1.7.9.5