83 lines
2.9 KiB
Markdown
83 lines
2.9 KiB
Markdown
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# QListWidget 拖拽、框选
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```python
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# 隐藏横向滚动条
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self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
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# 不能编辑
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self.setEditTriggers(self.NoEditTriggers)
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# 开启拖功能
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self.setDragEnabled(True)
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# 只能往外拖
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self.setDragDropMode(self.DragOnly)
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# 忽略放
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self.setDefaultDropAction(Qt.IgnoreAction)
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# ****重要的一句（作用是可以单选，多选。Ctrl、Shift多选，可从空白位置框选）****
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# ****不能用ExtendedSelection,因为它可以在选中item后继续框选会和拖拽冲突****
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self.setSelectionMode(self.ContiguousSelection)
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# 设置从左到右、自动换行、依次排列
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self.setFlow(self.LeftToRight)
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self.setWrapping(True)
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self.setResizeMode(self.Adjust)
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# item的间隔
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self.setSpacing(5)
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# 橡皮筋(用于框选效果)
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self._rubberPos = None
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self._rubberBand = QRubberBand(QRubberBand.Rectangle, self)
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```
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## 拖动Item
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```python
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# 实现拖拽的时候预览效果图
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# 这里演示拼接所有的item截图(也可以自己写算法实现堆叠效果)
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def startDrag(self, supportedActions):
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items = self.selectedItems()
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drag = QDrag(self)
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mimeData = self.mimeData(items)
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# 由于QMimeData只能设置image、urls、str、bytes等等不方便
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# 这里添加一个额外的属性直接把item放进去,后面可以根据item取出数据
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mimeData.setProperty('myItems', items)
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drag.setMimeData(mimeData)
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pixmap = QPixmap(self.viewport().visibleRegion().boundingRect().size())
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pixmap.fill(Qt.transparent)
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painter = QPainter()
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painter.begin(pixmap)
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for item in items:
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rect = self.visualRect(self.indexFromItem(item))
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painter.drawPixmap(rect, self.viewport().grab(rect))
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painter.end()
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drag.setPixmap(pixmap)
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drag.setHotSpot(self.viewport().mapFromGlobal(QCursor.pos()))
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drag.exec_(supportedActions)
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```
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## 模拟框选
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```python
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def mousePressEvent(self, event):
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# 列表框点击事件,用于设置框选工具的开始位置
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super(DragListWidget, self).mousePressEvent(event)
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if event.buttons() != Qt.LeftButton or self.itemAt(event.pos()):
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return
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self._rubberPos = event.pos()
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self._rubberBand.setGeometry(QRect(self._rubberPos, QSize()))
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self._rubberBand.show()
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def mouseReleaseEvent(self, event):
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# 列表框点击释放事件,用于隐藏框选工具
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super(DragListWidget, self).mouseReleaseEvent(event)
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self._rubberPos = None
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self._rubberBand.hide()
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def mouseMoveEvent(self, event):
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# 列表框鼠标移动事件,用于设置框选工具的矩形范围
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super(DragListWidget, self).mouseMoveEvent(event)
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if self._rubberPos:
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pos = event.pos()
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lx, ly = self._rubberPos.x(), self._rubberPos.y()
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rx, ry = pos.x(), pos.y()
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size = QSize(abs(rx - lx), abs(ry - ly))
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self._rubberBand.setGeometry(
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QRect(QPoint(min(lx, rx), min(ly, ry)), size))
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```
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## 截图
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