无法在布局内更改大小

Question

好吧,我有一个文本编辑器,上面有一个按钮...我希望文本编辑器在一个布局内部,以便它增加和减小它的大小QDialog,但我不想对按钮做同样的事情,顺便说一下,它没有我想要的尺寸,也无法改变它.我能做什么？

码:

from PyQt4 import QtCore, QtGui
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class TextEditorDlg(QDialog):
    def __init__(self, parent=None):
        QtGui.QDialog.__init__(self, parent)
        self.resize(500, 400)
        self.Grid = QtGui.QGridLayout(self)
        self.button = QtGui.QPushButton(self)
        self.Grid.addWidget(self.button, 0, 0)
        self.lineEdit = QtGui.QLineEdit(self)
        self.textEdit = QtGui.QTextEdit(self)
        self.Grid.addWidget(self.lineEdit, 1, 0)
        self.Grid.addWidget(self.textEdit, 2, 0)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    myapp = TextEditorDlg()
    myapp.show()
    sys.exit(app.exec_())

现在看到问题？

Answer 1

首先,我不明白你为什么要使用QGridLayout.你是否意识到你根本没有使用网格？你应该简单地使用一个QVBoxLayout.

无论如何,正如我在评论中提到的,您可以使用QHBoxLayout以下addStretch方法获得所需的"输出" :

import sys
from PyQt4 import QtCore, QtGui


class TextEditorDlg(QtGui.QDialog):
    def __init__(self, parent=None):
        super(TextEditorDlg, self).__init__(parent)
        self.resize(500, 400)

        self.button = QtGui.QPushButton(self)
        self.lineEdit = QtGui.QLineEdit(self)
        self.textEdit = QtGui.QTextEdit(self)

        self.button_layout = QtGui.QHBoxLayout()
        self.button_layout.addStretch()
        self.button_layout.addWidget(self.button)
        self.button_layout.addStretch()

        self.grid = QtGui.QGridLayout(self)

        self.grid.addLayout(self.button_layout, 0, 0)
        self.grid.addWidget(self.lineEdit, 1, 0)
        self.grid.addWidget(self.textEdit, 2, 0)

        # Alternative using QVBoxLayout:
        #self.layout = QtGui.QVBoxLayout(self)
        #self.layout.addLayout(self.button_layout)
        #self.layout.addWidget(self.line_edit)
        #self.layout.addWidget(self.text_edit)



if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    myapp = TextEditorDlg()
    myapp.show()
    sys.exit(app.exec_())

您可以调整通过整数的拉伸量addStretch.

如果你想使用a QGridLayout将按钮放在特定位置,那么你应该做这样的事情:

import sys
from PyQt4 import QtCore, QtGui


class TextEditorDlg(QtGui.QDialog):
    def __init__(self, parent=None):
        super(TextEditorDlg, self).__init__(parent)
        self.resize(500, 400)

        self.button = QtGui.QPushButton(self)
        self.lineEdit = QtGui.QLineEdit(self)
        self.textEdit = QtGui.QTextEdit(self)

        self.grid = QtGui.QGridLayout(self)

        # Use the row-span and column-span arguments!
        self.grid.addWidget(self.button, 0, 0, 1, 1)
        self.grid.addWidget(self.lineEdit, 1, 0, 1, 3)
        self.grid.addWidget(self.textEdit, 2, 0, 1, 3)



if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    myapp = TextEditorDlg()
    myapp.show()
    sys.exit(app.exec_())

您可以使用正确的行和列索引以及行跨度和列跨度值将按钮准确放置在所需位置.

编辑:如果要更改大小,则QPushButton必须更改QSizePolicy按钮和策略QTextEdit.例如:

import sys
from PyQt4 import QtCore, QtGui


class TextEditorDlg(QtGui.QDialog):
    def __init__(self, parent=None):
        super(TextEditorDlg, self).__init__(parent)
        self.resize(500, 400)

        self.button = QtGui.QPushButton(self)
        self.button.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Expanding)
        self.lineEdit = QtGui.QLineEdit(self)
        self.textEdit = QtGui.QTextEdit(self)
        self.textEdit.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Minimum)

        self.grid = QtGui.QGridLayout(self)

        # Use the row-span and column-span arguments!
        self.grid.addWidget(self.button, 0, 0, 3, 1)
        self.grid.addWidget(self.lineEdit, 3, 0, 1, 3)
        self.grid.addWidget(self.textEdit, 4, 0, 1, 3)



if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    myapp = TextEditorDlg()
    myapp.show()
    sys.exit(app.exec_())

你会看到按钮更大.您可以通过更改行跨度来控制有多大.在线self.grid.addWidget(self.button, 0, 0, 3, 1)增加/减少中,3将增加/减少垂直尺寸(实际上是小部件占用的行数)并且增加/减少1将改变水平尺寸.

请注意,如果将小部件放在0跨行的3行中,则必须小心不要创建冲突,向布局添加新的小部件.