设置最初移动的滚动区域 [英] Set scroll area initially moved

问题描述

我需要在滚动区域内创建一个大小部件，并最初将两个滑块设置在栏的中间.滚动条不起作用，我认为小部件没有很好地连接.雷:

I need to create a big widget inside a scroll area and initially set both sliders in the middle of the bar. The scroll bar does not work, the widgets are not well connected I think. MRE:

from PyQt5 import QtCore, QtWidgets
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QWidget
import sys


class Diedrico(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
    # Draws stuff


class UiVentana(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(UiVentana, self).__init__(parent)
        ventana.resize(1500, 1015)
        ventana.setFixedSize(1500, 1015)
        self.widget_central = QtWidgets.QWidget(ventana)

        scrol = QtWidgets.QScrollArea(self.widget_central)
        scrol.setWidgetResizable(True)
        scrol.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        scrol.setGeometry(QtCore.QRect(1010, 510, 470, 460))

        self.Diedrico = Diedrico(scrol)
        self.Diedrico.setGeometry(QtCore.QRect(0, 0, 1000, 1000))
        # This widget should be big enough to use the scroll bar, but it does not work

        ventana.setCentralWidget(self.widget_central)
        ventana.show()


if __name__ == "__main__":
    app = QtWidgets.QApplication([])
    ventana = QtWidgets.QMainWindow()
    ui = UiVentana()
    sys.exit(app.exec_())

推荐答案

看来问题出在 scrol.setWidgetResizable(True) 上，好像是调整了内容的大小...设置为False 对我有用.

It seems that the problem comes from scrol.setWidgetResizable(True), which seems to resize the content... setting this to False worked for me.

此外，要使滚动条居中，有几个选项，例如设置 verticalScrollBar 或使用 ensureVisible(x, y).

Also, to center the scrollbar, there are a few options, like setting the value of the verticalScrollBar or using ensureVisible(x, y).

一个可行的解决方案:

from PyQt5 import QtCore, QtWidgets
import sys

class UiVentana(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(UiVentana, self).__init__(parent)
        self.setupUi()

        self.label.setGeometry(QtCore.QRect(10, 0, 282, 331))
        self.label.setText("this is a long text\n" * 100)

        self.scrollArea.verticalScrollBar().setValue(300)

    def setupUi(self):
        self.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(self)

        self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
        self.scrollArea.setGeometry(QtCore.QRect(470, 330, 301, 211))
        self.scrollArea.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
        self.scrollArea.setWidgetResizable(False)

        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 282, 10000))

        self.label = QtWidgets.QLabel(self.scrollAreaWidgetContents)

        self.scrollArea.setWidget(self.scrollAreaWidgetContents)

        self.setCentralWidget(self.centralwidget)

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ui = UiVentana()
    ui.show()
    sys.exit(app.exec_())

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