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copied!<p>Below is a nearly direct translation of the Qt code from <a href="http://blog.qt.digia.com/blog/2007/06/06/lineedit-with-a-clear-button/" rel="noreferrer">here</a>. </p> <p>Differences:</p> <ul> <li>button is always visible</li> <li>clicking on the button emits <code>buttonClicked(bool)</code> signal</li> </ul> <p>Code:</p> <pre class="lang-py prettyprint-override"><code>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) </code></pre> <p>Usage:</p> <pre class="lang-py prettyprint-override"><code>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_()) </code></pre>

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