如何将 QGridLayout 动态调整大小和移动到 1/4s答案

【问题标题】：How to resize and move QGridLayout dynamically to 1/4s如何将 QGridLayout 动态调整大小和移动到 1/4s
【发布时间】：2019-12-03 20:52:04
【问题描述】：

这是我当前的窗口布局，我想把它分成 1/4，而不是 1/2。

这就是我希望我的窗口看起来的样子，但我似乎找不到一个好方法来调整 QGridLayout 到我想要的方式，而且 setColumnStretch 的工作方式仍然让我感到困惑，我没有t 完全理解它是如何工作的。

这是我的窗口布局代码：

self.pathRoot = QDir.rootPath()
self.labelFileName = QLabel(self)
self.labelFileName.setText("Search:")
self.labelFileName.resize(100, 30)
self.txtSearch = QLineEdit(self)
self.txtSearch.textChanged.connect(self.on_textChanged)
self.btnBack = QPushButton('Back', self)
self.btnBack.clicked.connect(self.back)
self.model = QFileSystemModel()
self.model.setRootPath(QDir.rootPath())
self.model.setFilter(QDir.NoDotAndDotDot | QDir.AllEntries | QDir.Dirs | QDir.Files)
self.proxy_model = QSortFilterProxyModel(recursiveFilteringEnabled = True, filterRole = QFileSystemModel.FileNameRole)
self.proxy_model.setSourceModel(self.model)
self.model.setReadOnly(False)
self.model.setNameFilterDisables(False)
self.indexRoot = self.model.index(self.model.rootPath())
self.treeView = QTreeView(self)
self.treeView.setModel(self.proxy_model)
self.adjust_root_index()
self.treeView.setRootIndex(self.indexRoot)
self.treeView.clicked.connect(self.on_treeView_clicked)
self.treeView.doubleClicked.connect(self.treeMedia_doubleClicked)
self.treeView.setAnimated(True)
self.treeView.setIndentation(20)
self.treeView.setSortingEnabled(True)
self.treeView.setDragEnabled(False)
self.treeView.setAcceptDrops(False)
self.treeView.setDropIndicatorShown(True)
self.treeView.setEditTriggers(QTreeView.NoEditTriggers)
self.treeView.setContextMenuPolicy(Qt.CustomContextMenu)
self.treeView.customContextMenuRequested.connect(self.showContextMenu)
for i in range(1, self.treeView.model().columnCount()):
    self.treeView.header().hideSection(i)
self.gridLayout = QGridLayout()
self.gridLayout.addWidget(self.labelFileName, 0, 0)
self.gridLayout.addWidget(self.btnBack, 2, 0)
self.gridLayout.addWidget(self.txtSearch, 1, 0)
self.gridLayout.addWidget(self.treeView, 3, 0)
self.gridLayout1 = QGridLayout()
self.progressbar = QProgressBar(self)
self.lblProgress = QLabel('0/0', self)
self.btnClearBatches = QPushButton('Clear Batches', self)
self.btnClearBatches.clicked.connect(self.clear_batches)
self.layout = QHBoxLayout(self)
self.layout.addLayout(self.gridLayout)
self.layout.addLayout(self.gridLayout1)
self.scroll = QScrollArea(self)
self.gridLayout1.addWidget(self.scroll, 0, 0)
self.gridLayout1.addWidget(self.lblProgress, 1, 0)
self.gridLayout1.addWidget(self.progressbar, 2, 0)
self.gridLayout1.addWidget(self.btnClearBatches, 3, 0)
self.scroll.move(7, 80)
self.scroll.setWidgetResizable(True)
self.content = QWidget()
self.scroll.setWidget(self.content)
self.lay = QGridLayout(self.content)

【问题讨论】：

提供minimal reproducible example。我也看到改变位置按钮，你可以更好地解释自己，最后在你提供的那段代码中还有其他小部件。
按钮，进度条，可以忽略，我只关心窗口上QGridLayouts的宽度，就是我卡住的部分..
为此你需要提供一个MRE，并且显然消除了可以忽略的东西。
什么和 MRE？
MRE: minimal reproducible example .....

标签： python pyqt pyqt5 qlayout qgridlayout

【解决方案1】：

没有必要只使用QGridLayout来尝试构建所有内容，例如设置左右块的拉伸因子，您可以使用QWidget作为容器。由于您没有提供 MRE，因此我从头开始创建设计。

import sys

from PyQt5 import QtWidgets


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = QtWidgets.QWidget()

    label = QtWidgets.QLabel("Label")
    button = QtWidgets.QPushButton("Button")
    lineedit = QtWidgets.QLineEdit()

    left_gridlayout = QtWidgets.QGridLayout()
    right_gridlayout = QtWidgets.QGridLayout()

    left_widget = QtWidgets.QWidget()
    left_widget.setContentsMargins(0, 0, 0, 0)
    vbox = QtWidgets.QVBoxLayout(left_widget)
    vbox.setContentsMargins(0, 0, 0, 0)
    vbox.addWidget(label)

    button_and_lineedit_container = QtWidgets.QWidget()
    hlay_2 = QtWidgets.QHBoxLayout(button_and_lineedit_container)
    hlay_2.setContentsMargins(0, 0, 0, 0)
    hlay_2.addWidget(button)
    hlay_2.addWidget(lineedit, stretch=1)
    vbox.addWidget(button_and_lineedit_container)
    bottom_container = QtWidgets.QWidget()
    bottom_container.setContentsMargins(0, 0, 0, 0)
    bottom_container.setLayout(left_gridlayout)
    vbox.addWidget(bottom_container, stretch=1)

    right_widget = QtWidgets.QWidget()
    right_widget.setLayout(right_gridlayout)

    hlay = QtWidgets.QHBoxLayout(w)
    hlay.addWidget(left_widget, stretch=1)
    hlay.addWidget(right_widget, stretch=3)

    # debug
    bottom_container.setStyleSheet("background-color:salmon;")
    right_widget.setStyleSheet("background-color:gray;")

    w.resize(640, 480)
    w.show()

    sys.exit(app.exec())

【讨论】：