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99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
#!/usr/bin/env python
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"""
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pythonconsolewidget.py
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A Python console custom widget for Qt Designer.
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Copyright (C) 2006 David Boddie <david@boddie.org.uk>
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Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""
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from PyQt5.QtCore import pyqtSignal, QEvent, Qt
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from PyQt5.QtWidgets import QApplication, QLineEdit
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class PythonConsoleWidget(QLineEdit):
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"""PythonConsoleWidget(QLineEdit)
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Provides a custom widget to accept Python expressions and emit output
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to other components via a custom signal.
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"""
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pythonOutput = pyqtSignal(str)
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def __init__(self, parent=None):
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super(PythonConsoleWidget, self).__init__(parent)
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self.history = []
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self.current = -1
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self.returnPressed.connect(self.execute)
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def keyReleaseEvent(self, event):
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if event.type() == QEvent.KeyRelease:
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if event.key() == Qt.Key_Up:
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current = max(0, self.current - 1)
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if 0 <= current < len(self.history):
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self.setText(self.history[current])
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self.current = current
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event.accept()
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elif event.key() == Qt.Key_Down:
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current = min(len(self.history), self.current + 1)
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if 0 <= current < len(self.history):
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self.setText(self.history[current])
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else:
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self.clear()
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self.current = current
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event.accept()
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def execute(self):
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# Define this here to give users something to look at.
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qApp = QApplication.instance()
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self.expression = self.text()
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try:
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result = str(eval(str(self.expression)))
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# Emit the result of the evaluated expression.
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self.pythonOutput.emit(result)
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# Clear the line edit, append the successful expression to the
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# history, and update the current command index.
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self.clear()
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self.history.append(self.expression)
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self.current = len(self.history)
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except:
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pass
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if __name__ == "__main__":
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import sys
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app = QApplication(sys.argv)
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widget = PythonConsoleWidget()
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widget.show()
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sys.exit(app.exec_())
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