def wheelEvent(self, event: QWheelEvent) -> None: # pylint: disable=invalid-name
"""With Ctrl depressed, zoom the current image, otherwise fire the
next/previous functions."""
modifiers = QApplication.keyboardModifiers()
if event.angleDelta().y() == 120 and modifiers == Qt.ControlModifier:
self.view.scale(0.75, 0.75)
elif event.angleDelta().y() == 120:
self.previous()
elif event.angleDelta().y(
) == -120 and modifiers == Qt.ControlModifier:
self.view.scale(1.25, 1.25)
elif event.angleDelta().y() == -120:
self.next()
def wheelEvent(self, we: QtGui.QWheelEvent):
if self.m_zoom > 0.1 and we.angleDelta().y() < 0:
self.m_xPan -= ((float)(we.position().x() / self.width() - 0.5 + self.m_xPan)) * (1 - 1 / ZOOMSTEP)
self.m_yPan += ((float)(we.position().y() / self.height() - 0.5 - self.m_yPan)) * (1 - 1 / ZOOMSTEP)
self.m_zoom /= ZOOMSTEP
elif self.m_zoom < 10 and we.angleDelta().y() > 0:
self.m_xPan -= ((float)(we.position().x() / self.width() - 0.5 + self.m_xPan)) * (1 - ZOOMSTEP)
self.m_yPan += ((float)(we.position().y() / self.height() - 0.5 - self.m_yPan)) * (1 - ZOOMSTEP)
self.m_zoom *= ZOOMSTEP
self.updateProjection()
self.updateView()
def zoom(view: QGraphicsView, e: QWheelEvent, mode: str):
zoom_in_factor = 1.25
zoom_out_factor = 1 / zoom_in_factor
view.setTransformationAnchor(QGraphicsView.NoAnchor)
view.setResizeAnchor(QGraphicsView.NoAnchor)
old_pos = view.mapToScene(int(e.position().x()), int(e.position().y()))
if mode == "zoom-in":
zoom_factor = zoom_in_factor
else:
zoom_factor = zoom_out_factor
view.scale(zoom_factor, zoom_factor)
new_pos = view.mapToScene(int(e.position().x()), int(e.position().y()))
delta = new_pos - old_pos
view.translate(delta.x(), delta.y())
def wheelEvent(self, event: QWheelEvent) -> NoReturn:
mouse_pos = event.position()
scene_pos = self.mapToScene(mouse_pos.toPoint())
view_w = self.viewport().width()
view_h = self.viewport().height()
h_scale = mouse_pos.x() / view_w
v_scale = mouse_pos.y() / view_h
wheel_delta = event.angleDelta().y()
if wheel_delta > 0:
self.scale(1.2, 1.2)
else:
self.scale(1 / 1.2, 1 / 1.2)
view_point = self.transform().map(scene_pos)
self.horizontalScrollBar().setValue(view_point.x() - view_w * h_scale)
self.verticalScrollBar().setValue(view_point.y() - view_h * v_scale)
self._update_fixed_widgets()
def wheelEvent(self, event: QWheelEvent) -> None:
result = super().wheelEvent(event)
# repaint previously hovered row on scroll avoid repaint artifacts
index = self.model().index(self.hoverIndexRow, 0)
self.hoverIndexRow = self.indexAt(event.position().toPoint()).row()
rect = self.visualRect(index)
rect.setLeft(0)
rect.setRight(self.viewport().width())
self.viewport().repaint(rect)
return result
def wheelEvent(self, event: QWheelEvent):
numSteps = float(event.angleDelta().y()) / 1000
oldWorldPos = self.mapToScene(self._currentCursorPosition.toPoint())
self._zoom = min(self._zoom + numSteps, 0)
self.UpdateView()
newWorldPos = self.mapToScene(self._currentCursorPosition.toPoint())
delta = newWorldPos - oldWorldPos
self._offset -= delta
self.UpdateView()
def change_view_zoom(view: QGraphicsView, e: QWheelEvent):
if e.angleDelta().y() > 0 and view.transform().m11() < 1000.0:
ViewTools.zoom(view, e, "zoom-in")
elif e.angleDelta().y() < 0 and view.transform().m11() > 0.01:
ViewTools.zoom(view, e, "zoom-out")