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from qtpy.QtCore import Qt, QPoint, QPointF
from qtpy.QtGui import QMouseEvent, QWheelEvent, QPainter
from qtpy.QtWidgets import QApplication, QGraphicsView, QScrollBar
from .init_values import AliasingReason, canvas
class CustomScrollBar(QScrollBar):
def __init__(self, orientation, parent):
QScrollBar.__init__(self, orientation, parent)
def mouseMoveEvent(self, event) -> None:
super().mouseMoveEvent(event)
canvas.qobject.start_aliasing_check(
AliasingReason.SCROLL_BAR_MOVE)
def mouseReleaseEvent(self, event) -> None:
super().mouseReleaseEvent(event)
canvas.set_aliasing_reason(AliasingReason.SCROLL_BAR_MOVE, False)
# taken partially from carla (falktx)
class PatchGraphicsView(QGraphicsView):
def __init__(self, parent):
super().__init__(parent)
self.setTransformationAnchor(
QGraphicsView.ViewportAnchor.AnchorUnderMouse)
self.setOptimizationFlag(
QGraphicsView.OptimizationFlag.DontAdjustForAntialiasing, True)
self.setOptimizationFlag(
QGraphicsView.OptimizationFlag.DontSavePainterState, True)
self.setRenderHint(QPainter.RenderHint.Antialiasing, True)
self._h_scroll_bar = CustomScrollBar(Qt.Orientation.Horizontal, self)
self.setHorizontalScrollBar(self._h_scroll_bar)
self._v_scroll_bar = CustomScrollBar(Qt.Orientation.Vertical, self)
self.setVerticalScrollBar(self._v_scroll_bar)
self._panning = False
self.transforming = False
def mousePressEvent(self, event):
if (event.button() == Qt.MouseButton.MiddleButton
and not (QApplication.keyboardModifiers()
& Qt.KeyboardModifier.ControlModifier)):
self._panning = True
self.setDragMode(QGraphicsView.DragMode.ScrollHandDrag)
event = QMouseEvent(
event.type(), QPointF(event.pos()),
Qt.MouseButton.LeftButton, Qt.MouseButton.LeftButton,
event.modifiers())
QGraphicsView.mousePressEvent(self, event)
def mouseReleaseEvent(self, event):
QGraphicsView.mouseReleaseEvent(self, event)
if not self._panning:
return
self._panning = False
self.setDragMode(QGraphicsView.DragMode.NoDrag)
def wheelEvent(self, ev: QWheelEvent) -> None:
if (ev.modifiers() & Qt.KeyboardModifier.ShiftModifier
or (not ev.modifiers() & Qt.KeyboardModifier.AltModifier
and not self.verticalScrollBar().isVisible())):
# lie to Qt saying to QGraphicsView and QGraphicsScene
# that keyboard modifier key is ALT
x, y = ev.angleDelta().x(), ev.angleDelta().y()
new_delta = QPoint(y, x)
new_event = QWheelEvent(
ev.position(), ev.globalPosition(),
ev.pixelDelta(), new_delta,
ev.buttons(), Qt.KeyboardModifier.AltModifier,
ev.phase(), ev.inverted())
QGraphicsView.wheelEvent(self, new_event)
return
QGraphicsView.wheelEvent(self, ev)
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