我發現很少有演示代碼intersects，但主要是按鈕。像這樣的東西：for child in self.findChildren(QPushButton): if rect.intersects(child.geometry( )): selected.append(child)但是，如何在 GraphicsScene 中找到與“Marquee”選擇（QRubberBand）相交的圖像？我嘗試用 QPixmap、QGraphicsScene、QGraphicsPixmapItem 替換 findChildren(QPushButton)，它總是給我返回空列表。
1 回答
BIG陽
TA貢獻1859條經驗 獲得超6個贊
如果您正在使用具有 QGraphicsView 的 QRubberBand，則必須使用 RubberBandChanged 信號，并且在 items 方法旁邊，您將獲得 QRubberBand 下方的項目。
from PyQt5 import QtCore, QtGui, QtWidgets
import random
def create_pixmap():
pixmap = QtGui.QPixmap(100, 100)
pixmap.fill(QtGui.QColor(*random.sample(range(255), 3)))
return pixmap
class GraphicsView(QtWidgets.QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
self.setScene(QtWidgets.QGraphicsScene(self))
self.setDragMode(QtWidgets.QGraphicsView.RubberBandDrag)
self.rubberBandChanged.connect(self.on_rubberBandChanged)
for _ in range(5):
item = QtWidgets.QGraphicsPixmapItem(create_pixmap())
item.setPos(*random.sample(range(500), 2))
self.scene().addItem(item)
@QtCore.pyqtSlot("QRect", "QPointF", "QPointF")
def on_rubberBandChanged(
self, rubberBandRect, fromScenePoint, toScenePoint
):
r = QtCore.QRectF(fromScenePoint, toScenePoint)
selected = self.items(rubberBandRect)
print(selected)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = GraphicsView()
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
如果您使用另一個 QRubberBand，則邏輯與此類似，因為您必須使用QGraphicsView的items()方法
from PyQt5 import QtCore, QtGui, QtWidgets
import random
def create_pixmap():
pixmap = QtGui.QPixmap(100, 100)
pixmap.fill(QtGui.QColor(*random.sample(range(255), 3)))
return pixmap
class GraphicsView(QtWidgets.QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
self.setScene(QtWidgets.QGraphicsScene(self))
self._rubberBand = QtWidgets.QRubberBand(
QtWidgets.QRubberBand.Rectangle, self.viewport()
)
self._rubberBand.hide()
self._origin = QtCore.QPoint()
for _ in range(5):
item = QtWidgets.QGraphicsPixmapItem(create_pixmap())
item.setPos(*random.sample(range(500), 2))
self.scene().addItem(item)
def mousePressEvent(self, event):
self._origin = event.pos()
self._rubberBand.setGeometry(QtCore.QRect(self._origin, QtCore.QSize()))
self._rubberBand.show()
super(GraphicsView, self).mousePressEvent(event)
def mouseMoveEvent(self, event):
self._rubberBand.setGeometry(
QtCore.QRect(self._origin, event.pos()).normalized()
)
def mouseReleaseEvent(self, event):
self._rubberBand.setGeometry(
QtCore.QRect(self._origin, event.pos()).normalized()
)
selected = self.items(self._rubberBand.geometry())
print(selected)
self._rubberBand.hide()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = GraphicsView()
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
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