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Implement the pinch gesture for font size zooming

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This commit is contained in:
Kovid Goyal 2014-02-11 13:42:34 +05:30
parent cc0ad5d918
commit ea6b9f712b
1 changed files with 27 additions and 1 deletions
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28
src/calibre/gui2/viewer/gestures.py
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@ -29,9 +29,12 @@ SWIPE_HOLD_INTERVAL = 0.5 # seconds
HOLD_THRESHOLD = 1.0 # seconds
TAP_THRESHOLD = 50 # manhattan pixels
SWIPE_DISTANCE = 100 # manhattan pixels
PINCH_CENTER_THRESHOLD = 150 # manhattan pixels
PINCH_SQUEEZE_FACTOR = 2.5 # smaller length must be less that larger length / squeeze factor
Tap, TapAndHold, Pinch, Swipe, SwipeAndHold = 'Tap', 'TapAndHold', 'Pinch', 'Swipe', 'SwipeAndHold'
Left, Right, Up, Down = 'Left', 'Right', 'Up', 'Down'
In, Out = 'In', 'Out'
class TouchPoint(object):
@ -65,10 +68,24 @@ class TouchPoint(object):
axis = (Left, Right) if xabs > yabs else (Up, Down)
return axis[0 if d < 0 else 1]
def get_pinch(p1, p2):
starts = [p1.start_screen_position, p2.start_screen_position]
ends = [p1.current_screen_position, p2.current_screen_position]
start_center = (starts[0] + starts[1]) / 2.0
end_center = (ends[0] + ends[1]) / 2.0
if (start_center - end_center).manhattanLength() > PINCH_CENTER_THRESHOLD:
return None
start_length = (starts[0] - starts[1]).manhattanLength()
end_length = (ends[0] - ends[1]).manhattanLength()
if min(start_length, end_length) > max(start_length, end_length) / PINCH_SQUEEZE_FACTOR:
return None
return In if start_length > end_length else Out
class State(QObject):
tapped = pyqtSignal(object)
swiped = pyqtSignal(object)
pinched = pyqtSignal(object)
tap_hold_started = pyqtSignal(object)
tap_hold_updated = pyqtSignal(object)
swipe_hold_started = pyqtSignal(object)
@ -156,7 +173,11 @@ class State(QObject):
return
if Pinch in self.possible_gestures:
pass # TODO: Implement this
points = tuple(self.touch_points.itervalues())
if len(points) == 2:
pinch_dir = get_pinch(*points)
if pinch_dir is not None:
self.pinched.emit(pinch_dir)
if TapAndHold in self.possible_gestures:
tp = next(self.touch_points.itervalues())
@ -182,6 +203,7 @@ class GestureHandler(QObject):
self.state.swipe_hold_started.connect(partial(self.handle_swipe_hold, 'start'))
self.state.swipe_hold_updated.connect(partial(self.handle_swipe_hold, 'update'))
self.state.swipe_hold_finished.connect(partial(self.handle_swipe_hold, 'end'))
self.state.pinched.connect(self.handle_pinch)
self.evmap = {QEvent.TouchBegin: 'start', QEvent.TouchUpdate: 'update', QEvent.TouchEnd: 'end'}
# Ignore fake mouse events generated by the window system from touch
@ -287,3 +309,7 @@ class GestureHandler(QObject):
elif action == 'end':
self.last_swipe_hold_update = None
def handle_pinch(self, direction):
attr = 'magnify' if direction is Out else 'shrink'
getattr(self.parent(), '%s_fonts' % attr)()