我目前正在嘗試在 Qt (python) 中重現(xiàn) Window 10 開(kāi)始菜單滾動(dòng)條，但我不知道如何調(diào)整自定義 QScrollBar 的大小以在運(yùn)行時(shí)更改其寬度。我嘗試使用 QScrollBar.resize 方法（在 EnterEvent 和 LeaveEvent 中）調(diào)整它的大小，但它會(huì)在“繪圖區(qū)域”之外縮放小部件。例如，我的滾動(dòng)條設(shè)置為 QScrollArea，當(dāng)我嘗試調(diào)整它的大小時(shí)，它不會(huì)占用更多空間并移動(dòng)小部件，而不是它只是在我看不到它的右側(cè)縮放。我目前找到的唯一解決方案是使用 StyleSheet，但我無(wú)法為其設(shè)置動(dòng)畫(huà)以實(shí)現(xiàn)我正在尋找的平滑調(diào)整大小。有一些代碼供您測(cè)試并查看問(wèn)題所在：from PySide2 import QtWidgets, QtCorefrom functools import partialclass MyTE(QtWidgets.QPlainTextEdit): def __init__(self): super(MyTE, self).__init__() self.setVerticalScrollBar(MyScrollBar(self)) self.setPlainText('mmmmmmmmmmmmmmmmmmmmmmmmmmmmm'*50) class MyScrollBar(QtWidgets.QScrollBar): def __init__(self, parent=None): super(MyScrollBar, self).__init__(parent=parent) self.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding) def enterEvent(self, event): super(MyScrollBar, self).enterEvent(event) self.resize(QtCore.QSize(4, self.height())) def leaveEvent(self, event): super(MyScrollBar, self).leaveEvent(event) self.resize(QtCore.QSize(10, self.height())) wid = MyTE()wid.show()
2 回答
天涯盡頭無(wú)女友
TA貢獻(xiàn)1831條經(jīng)驗(yàn) 獲得超9個(gè)贊
.0我終于找到了如何在不使用樣式表的情況下做到這一點(diǎn)！感謝 eyllanesc 的回答，它給了我一個(gè)新的工作基礎(chǔ)，我終于明白了 Qt 如何處理調(diào)整大?。ㄎ也拢?，我在setFixedSize每次動(dòng)畫(huà)值發(fā)生變化時(shí)使用名為 的方法。
為了工作，這需要有一個(gè)重寫(xiě)的sizeHint方法來(lái)返回動(dòng)畫(huà)的寬度值。此外，這適用于 Autodesk Maya（不幸的是，eyllanesc 提供的解決方案在 Maya 中不起作用，原因未知）。
我的解決方案是：
from PySide2 import QtWidgets, QtCore, QtGui
class MyTE(QtWidgets.QPlainTextEdit):
def __init__(self):
super(MyTE, self).__init__()
self.setVerticalScrollBar(MyScrollBar(self))
self.setPlainText("mmmmmmmmmmmmmmmmmmmmmmmmmmmmm" * 50)
self.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding)
def resizeEvent(self, event):
super(MyTE, self).resizeEvent(event)
class MyScrollBar(QtWidgets.QScrollBar):
def __init__(self, parent=None):
super(MyScrollBar, self).__init__(parent=parent)
self._animation = QtCore.QVariantAnimation(
startValue=10.0, endValue=25.0, duration=300
)
self._animation.valueChanged.connect(self.changeWidth)
self._width = 10
def enterEvent(self, event):
super(MyScrollBar, self).enterEvent(event)
self._animation.setDirection(QtCore.QAbstractAnimation.Forward)
self._animation.start()
def leaveEvent(self, event):
super(MyScrollBar, self).leaveEvent(event)
self._animation.setDirection(QtCore.QAbstractAnimation.Backward)
self._animation.start()
def sizeHint(self):
"""This must be overrided and return the width processed by the animation
.. note:: In my final version I've replaced self.height() with 1 because it does not change
anything but self.height() was making my widget grow a bit each time.
"""
return QtCore.QSize(self._width, self.height())
def changeWidth(self, width):
self._width = width # This will allow us to return this value as the sizeHint width
self.setFixedWidth(width) # This will ensure to scale the widget properly.
if __name__ == "__main__":
app = QtWidgets.QApplication()
wid = MyTE()
wid.show()
app.exec_()
注意：QVariantAnimation 的 startValue 和 endValue 必須是 float，如果它們是 int 類(lèi)型，則動(dòng)畫(huà)將不起作用（適用于 Qt 5.6.1 (Maya 2018)，但不適用于 Qt 5.12.5 (Maya 2020)
PS：如果有人對(duì)我的最終小部件（Window 10 開(kāi)始菜單滾動(dòng)條）感興趣，請(qǐng)私下詢(xún)問(wèn)我。
料青山看我應(yīng)如是
TA貢獻(xiàn)1772條經(jīng)驗(yàn) 獲得超8個(gè)贊
為了使寬度變化更平滑，您可以使用QVariantAnimation：
from PySide2 import QtWidgets, QtCore
class MyTE(QtWidgets.QPlainTextEdit):
def __init__(self):
super(MyTE, self).__init__()
self.setVerticalScrollBar(MyScrollBar(self))
self.setPlainText("mmmmmmmmmmmmmmmmmmmmmmmmmmmmm" * 50)
class MyScrollBar(QtWidgets.QScrollBar):
def __init__(self, parent=None):
super(MyScrollBar, self).__init__(parent=parent)
self._animation = QtCore.QVariantAnimation(
startValue=10, endValue=25, duration=500
)
self._animation.valueChanged.connect(self.change_width)
def enterEvent(self, event):
super(MyScrollBar, self).enterEvent(event)
self._animation.setDirection(QtCore.QAbstractAnimation.Forward)
self._animation.start()
def leaveEvent(self, event):
super(MyScrollBar, self).leaveEvent(event)
self._animation.setDirection(QtCore.QAbstractAnimation.Backward)
self._animation.start()
def change_width(self, width):
self.setStyleSheet("""QScrollBar:vertical{ width: %dpx;}""" % (width,))
if __name__ == "__main__":
app = QtWidgets.QApplication()
wid = MyTE()
wid.show()
app.exec_()
添加回答
舉報(bào)
0/150
提交
取消