| 21 | |
| 22 | |
| 23 | class BackingWidget(QWidget): |
| 24 | def __init__(self, *args, **kwargs): |
| 25 | super().__init__(*args, **kwargs) |
| 26 | self._showed = False |
| 27 | self._thread = BackingPaint(self) |
| 28 | self.resize(800, 600) |
| 29 | |
| 30 | def closeEvent(self, event): |
| 31 | if self._thread: |
| 32 | self._thread.stop() |
| 33 | self._thread.quit() |
| 34 | self._thread.wait(100) |
| 35 | del self._thread |
| 36 | super().closeEvent(event) |
| 37 | |
| 38 | def showEvent(self, event): |
| 39 | super().showEvent(event) |
| 40 | if not self._showed: |
| 41 | self._showed = True |
| 42 | self._thread.start() |
| 43 | self._thread.resized.emit(self.width(), self.height()) |
| 44 | |
| 45 | def resizeEvent(self, event): |
| 46 | super().resizeEvent(event) |
| 47 | if self._showed and self._thread and self._thread.isRunning(): |
| 48 | self._thread.resized.emit(self.width(), self.height()) |
| 49 | |
| 50 | def paintEngine(self): |
| 51 | return None |
| 52 | |
| 53 | @Slot() |
| 54 | def paintOnGui(self): |
| 55 | if self._thread: |
| 56 | self._thread.paintOnGui() |
| 57 | |
| 58 | |
| 59 | if __name__ == "__main__": |