diff options
Diffstat (limited to 'src/main/python/utils/graphics.py')
| -rw-r--r-- | src/main/python/utils/graphics.py | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/src/main/python/utils/graphics.py b/src/main/python/utils/graphics.py index dce664a..0fe0030 100644 --- a/src/main/python/utils/graphics.py +++ b/src/main/python/utils/graphics.py @@ -5,7 +5,7 @@ from PyQt5 import QtWidgets class customView(QGraphicsView): """ - Defines custom QGraphicsView with zoom features, overriding wheel event + Defines custom QGraphicsView with zoom features and drag-drop accept event, overriding wheel event """ def __init__(self, scene = None, parent=None): if scene is not None: #overloaded constructor @@ -13,22 +13,28 @@ class customView(QGraphicsView): else: super(customView, self).__init__(parent) self._zoom = 1 - self.setDragMode(True) - self.setAcceptDrops(True) + self.setDragMode(True) #sets pannable using mouse + self.setAcceptDrops(True) #sets ability to accept drops + #following four functions are required to be overridden for drag-drop functionality def dragEnterEvent(self, QDragEnterEvent): + #defines acceptable drop items if QDragEnterEvent.mimeData().hasText(): QDragEnterEvent.acceptProposedAction() def dragMoveEvent(self, QDragMoveEvent): + #defines acceptable drop items if QDragMoveEvent.mimeData().hasText(): QDragMoveEvent.acceptProposedAction() def dragLeaveEvent(self, QDragLeaveEvent): + #accept any drag leave event, avoid unnecessary logging QDragLeaveEvent.accept() def dropEvent(self, QDropEvent): + #defines item drop, fetches text, creates corresponding QGraphicItem and adds it to scene if QDropEvent.mimeData().hasText(): + #QDropEvent.mimeData().text() defines intended drop item, the pos values define position graphic = getattr(QtWidgets, QDropEvent.mimeData().text())(QDropEvent.pos().x()-150, QDropEvent.pos().y()-150, 300, 300) graphic.setPen(QPen(Qt.black, 2)) graphic.setFlags(QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsMovable) @@ -63,19 +69,9 @@ class customView(QGraphicsView): self.scale(self.zoom / temp, self.zoom / temp) class customScene(QGraphicsScene): - def dragEnterEvent(self, e): - e.acceptProposedAction() - - def dropEvent(self, e): - # find item at these coordinates - item = self.itemAt(e.scenePos()) - if item.setAcceptDrops == True: - # pass on event to item at the coordinates - try: - item.dropEvent(e) - except RuntimeError: - pass #This will supress a Runtime Error generated when dropping into a widget with no MyProxy - - def dragMoveEvent(self, e): - e.acceptProposedAction() + """ + re-implement QGraphicsScene for future functionality + hint: QUndoFramework + """ + pass
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