pyqt lineedit右边显示按钮效果

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)

import sys

from PyQt4 import QtGui

def buttonClicked():

print 'You clicked the button!'

if __name__ == '__main__':

app = QtGui.QApplication(sys.argv)

main = ButtonLineEdit(r'C:\Users\Administrator\Desktop\a.jpg')

main.buttonClicked.connect(buttonClicked)

main.show()

sys.exit(app.exec_())