Thank you Justin. Wow so by setting minimal size it allows going smaller. I
wouldn't have suspected that.
By the way is it OK to call setPixmap over and over like I did in
resizeEvent? It seems a bit redundant.
def resizeEvent(self, event):
self.label.setPixmap(
self.pic.scaled(self.label.width(), self.label.height(),
QtCore.Qt.KeepAspectRatio))
But I tried doing self.pic.scaled and self.label.repaint but those 2 didn't
seem to do anything.
On Tuesday, June 26, 2018 at 2:49:13 AM UTC+7, Justin Israel wrote:
>
>
>
> On Tue, Jun 26, 2018, 12:39 AM Panupat Chongstitwattana <panu...@gmail.com
> <javascript:>> wrote:
>
>> Question on Pixmap resizing.
>>
>> I tried switching from fixed size to allow resizing.
>> This is what I have at the moment and what happens is that I can increase
>> my widget size,
>> but it won't let me decrease. How should I approach this?
>>
>
> Try self.label.setMinimumSize(minX, minY)
>
>
>> in __init__
>>
>> self.pic = QPixmap(self.images[self.image_index])
>>
>> # self.label.setScaledContents(True)
>> # self.label.setPixmap(self.pic.scaled(300, 200, QtCore.Qt.KeepAspectRatio))
>> self.label.setPixmap(
>> self.pic.scaled(self.label.width(), self.label.height(),
>> QtCore.Qt.KeepAspectRatio))
>>
>>
>> and an event override.
>>
>> def resizeEvent(self, event):
>> self.label.setPixmap(
>> self.pic.scaled(self.label.width(), self.label.height(),
>> QtCore.Qt.KeepAspectRatio))
>>
>>
>>
>>
>> On Monday, June 25, 2018 at 7:32:18 PM UTC+7, Panupat Chongstitwattana
>> wrote:
>>>
>>> Thank you for your suggestion Justin. Did you mean the mouseMoveEvent
>>> method? Made some adjustments and is working as intended.
>>>
>>> def mouseMoveEvent(self, event):
>>> if not self.tracking:
>>> return
>>> distance = self.mouse_start - event.x()
>>> if distance >= self.mouse_threshold:
>>> self.mouse_start = event.x()
>>> self.frame_step(1)
>>> elif distance <= -self.mouse_threshold:
>>> self.mouse_start = event.x()
>>> self.frame_step(-1)
>>>
>>>
>>> On Monday, June 25, 2018 at 3:39:18 PM UTC+7, Justin Israel wrote:
>>>>
>>>> One last tip about the event handlers. It might be good for you to make
>>>> use of if/elif instead of comparing extra cases that will never be true
>>>> since another event is going to match. It's just wasteful comparisons.
>>>>
>>>> Justin
>>>>
>>>> On Mon, Jun 25, 2018, 7:30 PM Marcus Ottosson <konstr...@gmail.com>
>>>> wrote:
>>>>
>>>>> Sometimes. In the case of closeEvent, calling it would close the GUI
>>>>> I think so you’d probably want your code to run first. In general, it
>>>>> depends on whether you want something done before or after the superclass
>>>>> implementation. In your case, someone overriding your mouseMoveEvent
>>>>> would have to decide whether the code should run before or after
>>>>> performing
>>>>> the scrubbing. Sometimes it doesn’t matter, sometimes it does.
>>>>>
>>>>>
>>>>> On 25 June 2018 at 08:19, Panupat Chongstitwattana <panu...@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> I see. Does it matter if you call super first thing or last thing in
>>>>>> the method override?
>>>>>>
>>>>>> On Monday, June 25, 2018 at 2:14:36 PM UTC+7, Marcus Ottosson wrote:
>>>>>>>
>>>>>>> You are most welcome.
>>>>>>>
>>>>>>> in what instances would you want, or need, to do that?
>>>>>>>
>>>>>>> If you’re inheriting from a class that already subclasses those,
>>>>>>> it’d be useful for when you want to add to the original behavior.
>>>>>>> Otherwise
>>>>>>> you’d be replacing it. For example, anyone inheriting from the class
>>>>>>> you’re
>>>>>>> just made may want to call that so as to still be able to get the
>>>>>>> scrubbing
>>>>>>> functionality.
>>>>>>>
>>>>>>> Sometimes you may want to call it because the superclass has
>>>>>>> implemented something for it. For example, overriding the closeEvent
>>>>>>> and not calling its superclass would override - and thus block - the
>>>>>>> GUI
>>>>>>> from closing. I’m not entirely sure when and why event handlers require
>>>>>>> this, so I make it a habit out of always calling it for Qt events.
>>>>>>>
>>>>>>>
>>>>>>> On 25 June 2018 at 07:57, Panupat Chongstitwattana <
>>>>>>> panu...@gmail.com> wrote:
>>>>>>>
>>>>>>>> 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> 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
>>>>>>>>>>> i
>>>>>>>>>>>
>>>>>>>>>>> --
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