图片查看控件
| 24 | |
| 25 | |
| 26 | class BigImageView(QGraphicsView): |
| 27 | """图片查看控件""" |
| 28 | |
| 29 | def __init__(self, *args, **kwargs): |
| 30 | image = kwargs.pop('image', None) |
| 31 | background = kwargs.pop('background', None) |
| 32 | super(BigImageView, self).__init__(*args, **kwargs) |
| 33 | self.setCursor(Qt.OpenHandCursor) |
| 34 | self.setBackground(background) |
| 35 | self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff) |
| 36 | self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff) |
| 37 | self.setRenderHints(QPainter.Antialiasing | QPainter.HighQualityAntialiasing | |
| 38 | QPainter.SmoothPixmapTransform) |
| 39 | self.setCacheMode(self.CacheBackground) |
| 40 | self.setViewportUpdateMode(self.SmartViewportUpdate) |
| 41 | self._item = QGraphicsPixmapItem() # 放置图像 |
| 42 | self._item.setFlags(QGraphicsPixmapItem.ItemIsFocusable | |
| 43 | QGraphicsPixmapItem.ItemIsMovable) |
| 44 | self._scene = QGraphicsScene(self) # 场景 |
| 45 | self.setScene(self._scene) |
| 46 | self._scene.addItem(self._item) |
| 47 | rect = QApplication.instance().desktop().availableGeometry() |
| 48 | self.resize(int(rect.width() * 2 / 3), int(rect.height() * 2 / 3)) |
| 49 | |
| 50 | self.pixmap = None |
| 51 | self._delta = 0.1 # 缩放 |
| 52 | self.setPixmap(image) |
| 53 | |
| 54 | def setBackground(self, color): |
| 55 | """设置背景颜色 |
| 56 | :param color: 背景颜色 |
| 57 | :type color: QColor or str or GlobalColor |
| 58 | """ |
| 59 | if isinstance(color, QColor): |
| 60 | self.setBackgroundBrush(color) |
| 61 | elif isinstance(color, (str, Qt.GlobalColor)): |
| 62 | color = QColor(color) |
| 63 | if color.isValid(): |
| 64 | self.setBackgroundBrush(color) |
| 65 | |
| 66 | def setPixmap(self, pixmap, fitIn=True): |
| 67 | """加载图片 |
| 68 | :param pixmap: 图片或者图片路径 |
| 69 | :param fitIn: 是否适应 |
| 70 | :type pixmap: QPixmap or QImage or str |
| 71 | :type fitIn: bool |
| 72 | """ |
| 73 | if isinstance(pixmap, QPixmap): |
| 74 | self.pixmap = pixmap |
| 75 | elif isinstance(pixmap, QImage): |
| 76 | self.pixmap = QPixmap.fromImage(pixmap) |
| 77 | elif isinstance(pixmap, str) and os.path.isfile(pixmap): |
| 78 | self.pixmap = QPixmap(pixmap) |
| 79 | else: |
| 80 | return |
| 81 | self._item.setPixmap(self.pixmap) |
| 82 | self._item.update() |
| 83 | self.setSceneDims() |