调整内容大小时QGridLayout不更新吗?

时间:2019-06-15 05:17:55

标签: python pyqt pyqt5 qgridlayout

我正在尝试使用QGridLayout来容纳可调整大小的小部件,但是当我调整它们的大小时不起作用,QGridLayout单元格保持不变...

这里是使我感到困惑的场景的最小工作示例。双击红色方块会增加其大小:

from PyQt5 import QtGui, QtWidgets
from PyQt5.QtCore import QSize, Qt
from PyQt5.QtWidgets import QSizePolicy
import sys

class Rect(QtWidgets.QFrame):
    def __init__(self, width, height):
        super().__init__()
        self.w = width
        self.h = height
        self.setStyleSheet("background-color: red")

    def mouseDoubleClickEvent(self, a0: QtGui.QMouseEvent):
        self.w *= 2
        self.h *= 2

        print(self.sizeHint())

    def sizeHint(self):
        return QSize(self.w,self.h)

    def minimumSizeHint(self):
        return self.sizeHint()

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    gridLayout = QtWidgets.QGridLayout()

    gridLayout.addWidget(Rect(100,100), 0, 0, 1, 1)
    gridLayout.addWidget(Rect(100,100), 1, 1, 1, 1)
    gridLayout.addItem(QtWidgets.QSpacerItem(0, 0, QSizePolicy.Expanding, QSizePolicy.Expanding), 2, 2, 1, 1)

    container = QtWidgets.QFrame()
    container.setLayout(gridLayout)

    container.resize(600,600)
    container.show()
    sys.exit(app.exec_())

1 个答案:

答案 0 :(得分:2)

如果希望将sizeHint()更改通知布局,则必须使用updateGeometry()方法:

def mouseDoubleClickEvent(self, event):
    self.w *= 2
    self.h *= 2
    self.updateGeometry() # <---
    super(Rect, self).mouseDoubleClickEvent(event)

另一方面,如果您更改窗口的大小,则不会更改Rect的大小,因为QSpacerItem将占据它可能的所有大小。