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 <[email protected]
> <javascript:>> 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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