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在pyqt5中获取滚动条拇指的大小/宽度?

qscrollbar pyqt5 pyqt python

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sdaau · 技术社区 · 6 年前

比如,你有一个Pyqt5滚动条:

我想以编程方式查找滚动条“Thumb”的宽度(编辑:在中称为“Slider”)。 http://pyqt.sourceforge.net/Docs/PyQt4/qscrollbar.html ,以及它的位置;我想像素首先是这个的“自然”单位。

从上面的图片,我猜 start 总是0-但是我能,如果可以,如何获取 left , right , width (不过,如果我们有 左边 和 正确的 , 宽度 平凡地 right-left ;及 end 以像素为单位?

我知道存在 QScrollBar 的 .value() , pageStep() 和 singleStep() 但是我不能确定它们是否与上面的像素尺寸有关。

(如果滚动条需要Pyqt5示例,请参见 Have tabs keep focus on mousewheel over them in a PyQt5 scrollarea? )

1 回复 | 直到 6 年前

1

3

eyllanesc Yonghwan Shin 6 年前

在这种情况下,必须使用qStyle()的SubControlRect()方法来获取矩形,从中可以获得所需的信息。

在下面的示例中,我创建了一个自定义的qscrollbar类,每当滑块的位置更改或改变qscrollbar的大小时,它都通过信号发出该信息。

from PyQt5 import QtCore, QtGui, QtWidgets

class Scrollbar(QtWidgets.QScrollBar):
    geometryChanged = QtCore.pyqtSignal(int, int, int, int, int)

    def __init__(self, parent=None):
        super(Scrollbar, self).__init__(parent)
        self.sliderMoved.connect(self.calculate_geometry)

    def resizeEvent(self, event):
        self.calculate_geometry()
        super(Scrollbar, self).resizeEvent(event)

    def calculate_geometry(self):
        opt = QtWidgets.QStyleOptionSlider()
        self.initStyleOption(opt)
        gr = self.style().subControlRect(QtWidgets.QStyle.CC_ScrollBar, opt,
            QtWidgets.QStyle.SC_ScrollBarGroove, self)
        sr = self.style().subControlRect(QtWidgets.QStyle.CC_ScrollBar, opt,
            QtWidgets.QStyle.SC_ScrollBarSlider, self)

        start = gr.left() if self.orientation() == QtCore.Qt.Horizontal else gr.top()
        left = sr.left() if self.orientation() == QtCore.Qt.Horizontal else sr.top()
        right = sr.right() if self.orientation() == QtCore.Qt.Horizontal else sr.bottom()
        width = sr.width() if self.orientation() == QtCore.Qt.Horizontal else sr.height()
        end = gr.right() if self.orientation() == QtCore.Qt.Horizontal else gr.bottom()
        self.geometryChanged.emit(start, left, width, right, end)

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        hlayv = QtWidgets.QHBoxLayout()
        hlayv.addWidget(QtWidgets.QLabel("start: "))
        self._start_label_v = QtWidgets.QLabel()
        hlayv.addWidget(self._start_label_v)
        hlayv.addWidget(QtWidgets.QLabel("left: "))
        self._left_label_v = QtWidgets.QLabel()
        hlayv.addWidget(self._left_label_v)
        hlayv.addWidget(QtWidgets.QLabel("width: "))
        self._width_label_v = QtWidgets.QLabel()
        hlayv.addWidget(self._width_label_v)
        hlayv.addWidget(QtWidgets.QLabel("right: "))
        self._right_label_v = QtWidgets.QLabel()
        hlayv.addWidget(self._right_label_v)
        hlayv.addWidget(QtWidgets.QLabel("end: "))
        self._end_label_v = QtWidgets.QLabel()
        hlayv.addWidget(self._end_label_v)

        hlayh = QtWidgets.QHBoxLayout()
        hlayh.addWidget(QtWidgets.QLabel("start: "))
        self._start_label_h = QtWidgets.QLabel()
        hlayh.addWidget(self._start_label_h)
        hlayh.addWidget(QtWidgets.QLabel("left: "))
        self._left_label_h = QtWidgets.QLabel()
        hlayh.addWidget(self._left_label_h)
        hlayh.addWidget(QtWidgets.QLabel("width: "))
        self._width_label_h = QtWidgets.QLabel()
        hlayh.addWidget(self._width_label_h)
        hlayh.addWidget(QtWidgets.QLabel("right: "))
        self._right_label_h = QtWidgets.QLabel()
        hlayh.addWidget(self._right_label_h)
        hlayh.addWidget(QtWidgets.QLabel("end: "))
        self._end_label_h = QtWidgets.QLabel()
        hlayh.addWidget(self._end_label_h)

        self.scrollarea = QtWidgets.QScrollArea()
        content_widget = QtWidgets.QLabel()
        content_widget.setStyleSheet('''background-color : red;''')
        content_widget.setFixedSize(1000, 1000)
        self.scrollarea.setWidget(content_widget)
        hscrollbar = Scrollbar()
        hscrollbar.geometryChanged.connect(self.on_vertical_geometryChanged)
        self.scrollarea.setHorizontalScrollBar(hscrollbar)
        self.scrollarea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)

        vscrollbar =Scrollbar()
        self.scrollarea.setVerticalScrollBar(vscrollbar)
        vscrollbar.geometryChanged.connect(self.on_horizontal_geometryChanged)
        self.scrollarea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)

        vlay = QtWidgets.QVBoxLayout(self)
        vlay.addWidget(QtWidgets.QLabel("<b>Vertical: </b>"))
        vlay.addLayout(hlayv)
        vlay.addWidget(QtWidgets.QLabel("<b>Horizontal: </b>"))
        vlay.addLayout(hlayh)
        vlay.addWidget(self.scrollarea)

    @QtCore.pyqtSlot(int, int, int, int, int)
    def on_vertical_geometryChanged(self, start, left, width, right, end):
        self._start_label_v.setNum(start)
        self._left_label_v.setNum(left)
        self._width_label_v.setNum(width)
        self._right_label_v.setNum(right)
        self._end_label_v.setNum(end)

    QtCore.pyqtSlot(int, int, int, int, int)
    def on_horizontal_geometryChanged(self, start, left, width, right, end):
        self._start_label_h.setNum(start)
        self._left_label_h.setNum(left)
        self._width_label_h.setNum(width)
        self._right_label_h.setNum(right)
        self._end_label_h.setNum(end)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())