experiment with touch event multiplexing

Now we can have 2 buttons!

src/apps/playground/__init__.py

@@ -3,6 +3,50 @@ from trezor import ui
 from trezor.utils import unimport_func
 
 
+def multiplex_touch_events(gens):
+    while True:
+        e, (x, y) = yield loop.Wait([
+            loop.EVT_TSTART,
+            loop.EVT_TMOVE,
+            loop.EVT_TEND,
+        ])
+        for gen in gens:
+            gen.send((e, (x, y)))
+
+
+def in_area(pos, area):
+    x, y = pos
+    ax, ay, aw, ah = area
+    return ax <= x <= ax + aw and ay <= y <= ay + ah
+
+
+def click_in(area, enter, leave):
+    while True:
+        e, pos = yield
+        if e is not loop.EVT_TSTART or not in_area(pos, area):
+            continue
+
+        inside = True
+        enter()
+
+        while True:
+            e, pos = yield
+            if e is loop.EVT_TMOVE:
+                if in_area(pos, area):
+                    if not inside:
+                        enter()
+                        inside = True
+                else:
+                    if inside:
+                        leave()
+                        inside = False
+            elif e is loop.EVT_TEND:
+                if in_area(pos, area):
+                    return
+                else:
+                    break
+
+
 def layout_tap_to_confirm(address, amount, currency):
 
     ui.display.bar(0, 0, 240, 40, ui.GREEN)
@@ -16,18 +60,35 @@ def layout_tap_to_confirm(address, amount, currency):
 
     f = open('apps/playground/tap_64.toig', 'rb')
     bg = ui.WHITE
+    style = ui.NORMAL
+
+    def enter():
+        nonlocal style
+        style = ui.BOLD
+
+    def leave():
+        nonlocal style
+        style = ui.NORMAL
 
     def func(fg):
-        ui.display.text(68, 212, 'TAP TO CONFIRM', ui.BOLD, fg, bg)
+        ui.display.text(68, 212, 'TAP TO CONFIRM', style, fg, bg)
         f.seek(0)
         ui.display.icon(3, 170, f.read(), bg, fg)
 
     animation = ui.animate_pulse(func, ui.BLACK, ui.GREY, speed=200000)
+    click_up = click_in((0, 0, 240, 40), enter, leave)
+    click_down = click_in((0, 200, 240, 40), enter, leave)
 
-    yield loop.Wait([
+    next(click_down)
+    next(click_up)
+
+    yield loop.Wait((
         animation,
-        loop.EVT_TSTART,
-    ])
+        multiplex_touch_events((
+            click_down,
+            click_up,
+        )),
+    ))
 
 
 @unimport_func

src/trezor/loop.py

@@ -26,14 +26,14 @@ if __debug__:
     log_delay_rb = array.array('i', [0] * log_delay_rb_len)
 
 
-def __schedule(gen, time=None):
+def __schedule(gen, args=(), time=None):
     if __debug__:
         log.debug(__name__, 'Scheduling %s %s', time, gen)
 
     if not time:
         time = utime.ticks_us()
 
-    heappush(time_queue, (time, gen))
+    heappush(time_queue, (time, gen, args))
 
 
 class Wait():
@@ -59,7 +59,7 @@ class Wait():
         self.received += 1
 
         if self.received == self.wait_for:
-            __schedule(self.callback)
+            __schedule(self.callback, (gen, result))
             self.callback = None
 
             if self.exit_others:
@@ -88,7 +88,7 @@ def run_forever(start_gens):
     while True:
 
         if time_queue:
-            t, _ = time_queue[0]
+            t, _, _ = time_queue[0]
             delay = t - utime.ticks_us()
         else:
             delay = delay_max
@@ -109,18 +109,17 @@ def run_forever(start_gens):
             if not gen:
                 log.info(__name__, 'No handler for event: %s', event)
                 continue
-            if not args:
-                args = None
         else:
             if time_queue:
                 # Run something from the time queue
-                _, gen = heappop(time_queue)
-                args = None
+                _, gen, args = heappop(time_queue)
             else:
                 # Sleep again
                 delay = delay_max
                 continue
 
+        if not args:
+            args = None
         try:
             ret = gen.send(args)
 
@@ -134,13 +133,12 @@ def run_forever(start_gens):
 
         if isinstance(ret, int) and ret >= 0:
             # Sleep until ret, call us later
-            __schedule(gen, ret)
+            __schedule(gen, (), ret)
 
         elif isinstance(ret, int) and ret in event_handlers:
             # Wait for event
             if event_handlers[ret]:
-                raise Exception('Already waiting for %s: %s' %
-                                (ret, event_handlers[ret]))
+                event_handlers[ret].close()
             event_handlers[ret] = gen
 
         elif isinstance(ret, Wait):