我正在嘗試鏈接兩個 qgraphicsview 對象，以便當一個窗口放大另一個 qgraphicsview 時也會縮放。我試圖通過在一個窗口要縮放時調用測試函數來實現這一點。然后我嘗試在另一個 qgraphicsview 對象中調用 self.scale(factor,factor) 。我收到一個錯誤：AttributeError：'PhotoViewer' 對象沒有屬性'viewer'。我如何得到我正在嘗試調用類 ui self.viewer 但從錯誤判斷我仍在 Photoviewer 對象中。當一個窗口被放大時，如何調用其他窗口 self.scale？提前致謝。from PyQt5 import QtCore, QtGui, QtWidgetsfrom PyQt5.QtCore import Qt, QPointfrom PyQt5.QtWidgets import QMainWindow, QApplicationfrom PyQt5.QtGui import QPixmap, QPainter, QPenimport sysclass PhotoViewer(QtWidgets.QGraphicsView): photoClicked = QtCore.pyqtSignal(QtCore.QPoint) def __init__(self, parent,num_view): super(PhotoViewer, self).__init__(parent) #to track which viewer self.num_view=num_view self.drawmode=0 self._zoom = 0 self.drawing = False self.lastPoint = QPoint() self.image=False self.image=QPixmap(r"image.jpg") self._empty = True self._scene = QtWidgets.QGraphicsScene(self) self._photo = QtWidgets.QGraphicsPixmapItem() self._scene.addItem(self._photo) self.setScene(self._scene) self.setTransformationAnchor(QtWidgets.QGraphicsView.AnchorUnderMouse) self.setResizeAnchor(QtWidgets.QGraphicsView.AnchorUnderMouse) self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff) self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff) self.setBackgroundBrush(QtGui.QBrush(QtGui.QColor(30, 30, 30))) self.setFrameShape(QtWidgets.QFrame.NoFrame) def hasPhoto(self): return not self._empty
1 回答
MYYA
TA貢獻1868條經驗 獲得超4個贊
您可以為此使用信號，而不是嘗試直接縮放視圖：
將以下代碼添加到PhotoViewer：
class PhotoViewer(QtWidgets.QGraphicsView):
scaled = QtCore.pyqtSignal(int, int, QtGui.QTransform, int)
....
def scale(self, horz, vert):
super().scale(horz, vert)
self.scaled.emit(self.horizontalScrollBar().value(),
self.verticalScrollBar().value(),
self.transform(),
self._zoom
)
def set_transform(self, horz_scroll, vert_scroll, transform, zoom):
# temporary block signals from scroll bars to prevent interference
horz_blocked = self.horizontalScrollBar().blockSignals(True)
vert_blocked = self.verticalScrollBar().blockSignals(True)
self._zoom = zoom
self.setTransform(transform)
dx = horz_scroll - self.horizontalScrollBar().value()
dy = vert_scroll - self.verticalScrollBar().value()
self.horizontalScrollBar().setValue(dx)
self.verticalScrollBar().setValue(dy)
self.horizontalScrollBar().blockSignals(horz_blocked)
self.verticalScrollBar().blockSignals(vert_blocked)
并ui：
class ui(QtWidgets.QWidget):
def __init__(self):
....
self.viewer.scaled.connect(self.viewer2.set_transform)
self.viewer2.scaled.connect(self.viewer.set_transform)
同時刪除對ui.test()form的調用PhotoViewer.wheelEvent。
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