PyQt / PySide - 小部件的实际大小答案

【问题标题】：PyQt / PySide - Actual size of a widgetPyQt / PySide - 小部件的实际大小
【发布时间】：2016-07-10 08:05:03
【问题描述】：

我在 Qt Designer 中制作了一个包含 QLineEdit 的小部件。根据 Qt Designer 的说法，QLineEdit 的高度是 25（对象属性，在几何图形下）。当我打印小部件的屏幕并测量实际像素大小时，它确实是 25 像素。问题是当我尝试使用 python 代码读取 QLineEdit 的高度时，它显示为 30。这是我尝试过的：

print self.subject_text.height()
print self.subject_text.geometry().height()
print self.subject_text.frameGeometry().height()
print self.subject_text.size()
print self.subject_text.frameSize().height()
print self.subject_text.rect()

他们都说 30。我想让 QPushButton 具有相同的高度，它使它比 QLineEdit 高 5 个像素。有什么方法可以读取 QLineEdit 的 ACTUAL 高度，即 25？

我使用 PySide 1.2.4、Python 2.7.10 32 位、Windows 7。

【问题讨论】：

行编辑器已内置边距。这是一个奇怪的怪癖，但它们总是比预期的要短一点。你在使用布局吗？

标签： qt pyqt pyside

【解决方案1】：

我找到了方法：

self.subject_text.sizeHint().height()

它给出了 QLineEdit 的实际高度。

【讨论】：

尺寸提示只是一个提示。如果涉及布局，可能会改变实际高度。

【解决方案2】：

#This is the example code for Edit the Height of the widget.
#If your are not expecting this answer, sorry.
#It is PyQt4, but you can try with PySide with small changes.

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore

class Window (QtGui.QWidget):
    def __init__(self, parent=None):        

        super(Window, self).__init__(parent)        

        self.verticalLayout     = QtGui.QVBoxLayout (self)
        self.verticalLayout.setObjectName ('verticalLayout')

        self.label = QtGui.QLabel(self)
        self.label.setObjectName('label')
        self.label.setText('Height')            

        self.spinBox = QtGui.QSpinBox(self)
        self.spinBox.setButtonSymbols(QtGui.QAbstractSpinBox.NoButtons)
        self.spinBox.setObjectName('spinBox')
        self.spinBox.setValue(20)       
        self.spinBox.setMaximum (1000)

        self.pushButton = QtGui.QPushButton(self)
        self.pushButton.setText('Apply') 

        self.horizontalLayout = QtGui.QHBoxLayout()
        self.horizontalLayout.setObjectName('horizontalLayout')
        self.horizontalLayout.addWidget(self.label)
        self.horizontalLayout.addWidget(self.spinBox)
        self.horizontalLayout.addWidget(self.pushButton)

        self.lineEdit = QtGui.QLineEdit(self)
        self.lineEdit.setObjectName('lineEdit')   

        self.pushButton_1 = QtGui.QPushButton(self)
        self.pushButton_1.setText('>')            

        self.pushButton_2 = QtGui.QPushButton(self)
        self.pushButton_2.setObjectName('pushButton_2') 
        self.pushButton_2.setText('20') 

        self.horizontalLayout_1 = QtGui.QHBoxLayout()
        self.horizontalLayout_1.setObjectName('horizontalLayout')
        self.horizontalLayout_1.addWidget(self.lineEdit)
        self.horizontalLayout_1.addWidget(self.pushButton_1)
        self.horizontalLayout_1.addWidget(self.pushButton_2)  

        self.verticalLayout.addLayout(self.horizontalLayout)
        self.verticalLayout.addLayout(self.horizontalLayout_1)

        self.pushButton.clicked.connect (self.applyToLineEdit)
        self.pushButton_1.clicked.connect (self.editPushButton)

    def applyToLineEdit (self) :        
        currentSize     = self.lineEdit.geometry ()
        currentValue    = self.spinBox.value() 

        w               = currentSize.width()
        #h               = currentSize.height()
        h               = currentValue        
        x               = currentSize.x()
        z               = currentSize.y()

        self.lineEdit.setGeometry (QtCore.QRect (w, h, x, z))
        self.lineEdit.setText ('My Height is %s'%str(h ))

        #The below line because of self.lineEdit is under the horizontalLayout, either not necessary 
        self.lineEdit.setMinimumSize (QtCore.QSize(0, h))


    def editPushButton (self) :
        currentSize     = self.lineEdit.geometry ()       
        w               = currentSize.width()
        h               = currentSize.height()
        x               = currentSize.x()
        z               = currentSize.y()

        self.pushButton_2.setGeometry (QtCore.QRect (w, h, x, z))
        self.pushButton_2.setText (str(h))

        #The below line because of self.lineEdit is under the horizontalLayout, either not necessary 
        self.pushButton_2.setMinimumSize (QtCore.QSize(0, h))

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

【讨论】：