如何在 QLineEdit 中插入按钮

Question

我需要帮助在 QLineEdit 中插入一个可以调用函数的按钮。

例如，像这张谷歌图片：

Answer 1

下面是来自here 的 Qt 代码几乎直接的翻译。

区别：

• 按钮始终可见
• 点击按钮会发出buttonClicked(bool)信号

代码：

from PyQt4 import QtGui, QtCore

class ButtonLineEdit(QtGui.QLineEdit):
    buttonClicked = QtCore.pyqtSignal(bool)

    def __init__(self, icon_file, parent=None):
        super(ButtonLineEdit, self).__init__(parent)

        self.button = QtGui.QToolButton(self)
        self.button.setIcon(QtGui.QIcon(icon_file))
        self.button.setStyleSheet('border: 0px; padding: 0px;')
        self.button.setCursor(QtCore.Qt.ArrowCursor)
        self.button.clicked.connect(self.buttonClicked.emit)

        frameWidth = self.style().pixelMetric(QtGui.QStyle.PM_DefaultFrameWidth)
        buttonSize = self.button.sizeHint()

        self.setStyleSheet('QLineEdit {padding-right: %dpx; }' % (buttonSize.width() + frameWidth + 1))
        self.setMinimumSize(max(self.minimumSizeHint().width(), buttonSize.width() + frameWidth*2 + 2),
                            max(self.minimumSizeHint().height(), buttonSize.height() + frameWidth*2 + 2))

    def resizeEvent(self, event):
        buttonSize = self.button.sizeHint()
        frameWidth = self.style().pixelMetric(QtGui.QStyle.PM_DefaultFrameWidth)
        self.button.move(self.rect().right() - frameWidth - buttonSize.width(),
                         (self.rect().bottom() - buttonSize.height() + 1)/2)
        super(ButtonLineEdit, self).resizeEvent(event)

用法：

import sys
from PyQt4 import QtGui

def buttonClicked():
    print 'You clicked the button!'

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

    main = ButtonLineEdit('/path/to/my_fancy_icon.png')
    main.buttonClicked.connect(buttonClicked)
    main.show()

    sys.exit(app.exec_())

Answer 2

感谢我们的同事，Avaris，但他的例子并没有说服我，我决定让另一个更容易和更少的代码。 去学习吧！

#this code for example in btninlineedit.py

from PyQt4.QtGui import *
from PyQt4.QtCore import Qt
from PyQt4 import QtCore, QtGui
#Andrey Zhuk.
#####
try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class ButtonInLineEdit(QLineEdit):
    def __init__(self,parent=None):
        QLineEdit.__init__(self,parent)

        self.ButtonShowKeyboard = QToolButton(self)
        self.ButtonShowKeyboard.setCursor(Qt.PointingHandCursor)
        #self.ButtonShowKeyboard.show()
        self.ButtonShowKeyboard.setFocusPolicy(Qt.NoFocus)
        self.ButtonShowKeyboard.setIcon(QtGui.QIcon("images/YourIcon.svg"))
        self.ButtonShowKeyboard.setStyleSheet("background: transparent; border: none;")

        layout = QHBoxLayout(self)
        layout.addWidget(self.ButtonShowKeyboard,0,Qt.AlignRight)

        layout.setSpacing(0)
        layout.setMargin(5)
        # ToolTip 
        self.ButtonShowKeyboard.setToolTip(QtGui.QApplication.translate("None", "Show virtual keyboard", None, QtGui.QApplication.UnicodeUTF8))


#this code for example in main.py            
class main(/////****///**/): 
    def __init__(self):
     #blablablablaaaa

        self.KeyboardShow = False

self.connect(self.LineEdit.ButtonShowKeyboard, QtCore.SIGNAL("clicked()"), self.KeyboardShowHide)


def KeyboardShowHide(self):
    try:
        if self.KeyboardShow:
            self.KeyboardShow = False
            self.WidgetKeyboard.hide()
        else:
            self.KeyboardShow = True
            self.WidgetKeyboard.show()
    except:
            debug ("ошибка при вызове функции скрытые или показа клавиатуры (Main Window)")
#this code for example in btninlineedit.py

from forms.btninlineedit import ButtonInLineEdit



        self.LineEdit = ButtonInLineEdit()

Answer 3

这是可运行的代码：

from PyQt4.QtGui import *
from PyQt4.QtCore import *
from sys import argv, exit

class ButtonInLineEdit(QLineEdit):
    def __init__(self,parent=None):
        QLineEdit.__init__(self,parent)

        self.ButtonShowKeyboard = QToolButton(self)
        self.ButtonShowKeyboard.setCursor(Qt.PointingHandCursor)

        self.ButtonShowKeyboard.setFocusPolicy(Qt.NoFocus)
        self.ButtonShowKeyboard.setIcon(QIcon("icons/myIcon.png"))
        self.ButtonShowKeyboard.setStyleSheet("background: transparent; border: none;")

        layout = QHBoxLayout(self)
        layout.addWidget(self.ButtonShowKeyboard,0,Qt.AlignRight)

        layout.setSpacing(0)
        layout.setMargin(5)

        self.ButtonShowKeyboard.setToolTip(QApplication.translate("None", "Show virtual keyboard", None, QApplication.UnicodeUTF8))

def MyFunction(arg=None):
    print "MyFunction() called: arg = %s"%arg

a=QApplication(argv)
LineEdit = ButtonInLineEdit()
LineEdit.connect(LineEdit.ButtonShowKeyboard, SIGNAL("clicked()"), MyFunction)
LineEdit.show()
exit(a.exec_())

Answer 4

从 Qt 5.2 开始，QLineEdit.addAction() 是一种内置方法。 此外QLineEdit.setClearButtonEnabled() 在右侧添加了一个十字按钮（如在某些 OSX 控件上）以清除小部件的内容。

Answer 5

在qt C++中，我可以将pushButton拖放到LineEdit的左侧。之后，我只需要使用以下代码为LineEdit 设置styleSheet：

int FramWidth = lineEdit->style()->pixelMetric(QStyle::PM_DefaultFrameWidth);

lineEdit->setStyleSheet(QString("QLineEdit{padding-right: %1px; }").arg(ui->pushButton->sizeHint().width() + FramWidth +5));

它对我有用。希望它可以提供帮助。

Answer 6

class LineEditFileDialogWidget(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(LineEditFileDialogWidget, self).__init__(parent)
        self.setReadOnly(True)

        icon = QtWidgets.QApplication.style().standardIcon(QtWidgets.QStyle.SP_DirIcon)
        self.action = self.addAction(icon, QtWidgets.QLineEdit.TrailingPosition)
        self.action.triggered.connect(some function)

这是一个将图标与 QLineEdit 一起使用的示例