Thank you Marcus. Here's the updated methods and it's working as intended.
def mousePressEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
self.mouse_start = event.x()
self.tracking = True
def mouseReleaseEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
self.tracking = False
def mouseMoveEvent(self, event):
if self.tracking:
mouse_x = event.x()
distance = self.mouse_start - mouse_x
if abs(distance) >= self.mouse_threshold:
self.mouse_start = mouse_x
if distance > 0:
self.frame_step(1)
else:
self.frame_step(-1)
A little question please. From some example I saw, they would also add this
line to the events.
super(ClassName, self).mousePressEvent(event)
in what instances would you want, or need, to do that?
On Monday, June 25, 2018 at 1:44:19 PM UTC+7, Marcus Ottosson wrote:
> Using an event filter is a little heavy handed for what you’re trying to
> achieve, I think.
>
> The problem with it is that every event, including draw events, passes
> through your event filter waiting for it to either block the event - return
> True - or pass it through - return False. And the number of events can be
> quite a lot - sometimes tens of thousands of events per second.
>
> An alternative is to instead override mousePressEvent, mouseReleaseEvent
> and mouseMoveEvent. That way you wouldn’t inadvertently interfere with
> events you aren’t interested in, and handling them would remain quick even
> as complexity increases.
>
>
> On 25 June 2018 at 07:18, Panupat Chongstitwattana <panu...@gmail.com
> <javascript:>> wrote:
>
>> Got it working now with more returns added to the eventFilter.
>>
>> def eventFilter(self, obj, event):
>> if event.type() == event.MouseButtonPress:
>> if event.button() == QtCore.Qt.LeftButton:
>> self.mouse_start = event.x()
>> self.tracking = True
>> event.accept()
>> return True
>> if event.type() == event.MouseButtonRelease:
>> if event.button() == QtCore.Qt.LeftButton:
>> self.tracking = False
>> event.accept()
>> return True
>> if event.type() == event.MouseMove:
>> if self.tracking:
>> mouse_x = event.x()
>> distance = self.mouse_start - mouse_x
>> if abs(distance) >= self.mouse_threshold:
>> self.mouse_start = mouse_x
>> if distance > 0:
>> self.frame_step(1)
>> else:
>> self.frame_step(-1)
>> event.accept()
>> return True
>> return False
>>
>>
>> On Monday, June 25, 2018 at 12:42:57 PM UTC+7, Panupat Chongstitwattana
>> wrote:
>>>
>>> Thank you for your suggestion Marcus.
>>>
>>> I added MouseButtonPress and MouseButtonRelease event based on your
>>> suggestion and it almost work. I cannot get the image to repaint. It prints
>>> out the image name correctly however.
>>>
>>> I way to get the repaint working is to remove return True (line 51) from
>>> the eventFilter method, but then it would produce error about eventFilter
>>> wanting a boolean result over and over.
>>>
>>> # -*- coding: utf-8 -*-
>>> import sys
>>> from os.path import dirname, realpath, join
>>> from PySide.QtGui import (QApplication, QVBoxLayout, QLabel, QPixmap,
>>> QWidget)
>>> from PySide import QtCore
>>>
>>>
>>> class PlayTurntable(QWidget):
>>> def __init__(self, images, mouse_threshold=50, parent=None):
>>> super(PlayTurntable, self).__init__(parent)
>>>
>>> self.label = QLabel()
>>> self.label.setFixedWidth(300)
>>> self.label.setFixedHeight(200)
>>> layout = QVBoxLayout()
>>> layout.addWidget(self.label)
>>> self.setLayout(layout)
>>>
>>> # init variables
>>> self.tracking = False
>>> self.mouse_start = 0
>>> self.mouse_threshold = mouse_threshold
>>> self.images = images
>>> self.image_index = 0
>>> self.pic = QPixmap(self.images[self.image_index])
>>> self.label.setPixmap(self.pic.scaled(300, 200,
>>> QtCore.Qt.KeepAspectRatio))
>>> self.installEventFilter(self)
>>>
>>> def eventFilter(self, obj, event):
>>> if event.type() == event.MouseButtonPress:
>>> if event.button() == QtCore.Qt.LeftButton:
>>> self.mouse_start = event.x()
>>> self.tracking = True
>>> event.accept()
>>> if event.type() == event.MouseButtonRelease:
>>> if event.button() == QtCore.Qt.LeftButton:
>>> self.tracking = False
>>> event.accept()
>>> if event.type() == event.MouseMove:
>>> if self.tracking:
>>> mouse_x = event.x()
>>> distance = self.mouse_start - mouse_x
>>> if abs(distance) >= self.mouse_threshold:
>>> self.mouse_start = mouse_x
>>> if distance > 0:
>>> self.frame_step(1)
>>> else:
>>> self.frame_step(-1)
>>> event.accept()
>>> return True
>>>
>>> def frame_step(self, amount):
>>> self.image_index += amount
>>> if self.image_index >= len(self.images):
>>> self.image_index = 0
>>> elif self.image_index < 0:
>>> self.image_index = len(self.images) - 1
>>> print 'switching to: %s' % self.images[self.image_index]
>>>
>>> self.pic.load(self.images[self.image_index])
>>> self.label.setPixmap(
>>> self.pic.scaled(300, 200, QtCore.Qt.KeepAspectRatio))
>>> self.label.repaint()
>>>
>>>
>>> if __name__=='__main__':
>>> current_path = dirname(realpath(__file__))
>>> images = ['turn1.jpg', 'turn2.jpg', 'turn3.jpg', 'turn4.jpg']
>>> for index, value in enumerate(images):
>>> images[index] = join(current_path, value)
>>>
>>> app = QApplication(sys.argv)
>>> PT = PlayTurntable(images)
>>> PT.show()
>>> sys.exit(app.exec_())
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Friday, June 22, 2018 at 5:16:30 PM UTC+7, Marcus Ottosson wrote:
>>>>
>>>> Here's what I'd do.
>>>>
>>>> 1. On mouse press, capture the position of the mouse and register that
>>>> "scrubbing mode" is active.
>>>> 2. When scrubbing mode is active, in your `mouseMoveEvent` compare the
>>>> current position to the one stored on mouse press
>>>> 3. The distance (e.g. Manhattan length
>>>> <http://doc.qt.io/archives/qt-4.8/qpoint.html#manhattanLength>) is how
>>>> much to scrub.
>>>> 4. If the delta is positive, then you're scrubbing to the right.
>>>> Negative means scrubbing to the left.
>>>> 5. On mouse release, disable scrubbing mode.
>>>>
>>>> This should help produce a smooth and predictable scrubbing behaviour.
>>>>
>>>> On 22 June 2018 at 11:06, Panupat Chongstitwattana <panu...@gmail.com>
>>>> wrote:
>>>>
>>>>> Hi.
>>>>>
>>>>> I'm trying to create a turntable viewer and in need of some guidance
>>>>> please. In this view, I want to be able to click and hold left mouse
>>>>> button
>>>>> then drag left/right to turn the turntable, which are image sequences.
>>>>>
>>>>> My questions:
>>>>>
>>>>> - Is there other way I should approach this? The mouse move event
>>>>> triggers too fast and when I try to print out new image names they appear
>>>>> too rapidly.
>>>>>
>>>>> - How can I detect if I am moving mouse left or right?
>>>>>
>>>>> - The pixmap doesn't seem to repaint even if I explicitly tells it to.
>>>>>
>>>>> Appreciate any help. Thank you!
>>>>>
>>>>> --
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>>>>>
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>>>>> .
>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>
>>>>
>>>> --
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>>
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>> .
>>
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
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