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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