pyqt graphitem鼠标进入事件
我正在尝试连接到 QGraphicsItems 的鼠标输入事件，该事件被放置在 QGraphicsScene 上并通过 QGraphicsView 进行可视化。据我了解，为此重写的方法是从 QGraphicsItem （或其子类之一）派生的类中的 DragEnterEvent 。我的尝试如下所示：
class StaPoly(QtGui.QGraphicsPolygonItem):
def __init__(self,*args):
QtGui.QGraphicsPolygonItem.__init__(self,*args)
self.setAcceptDrops(True)
def dragEnterEvent(self,event):
print "Enter!"
...
def draw(self):
p = self.parent
self.group = QtGui.QGraphicsItemGroup(scene=p.scene)
...
for xpix in lons:
poly = QtGui.QPolygonF()
poly << QtCore.QPointF(xpix-symw,ypix)
poly << QtCore.QPointF(xpix,ypix+symh)
poly << QtCore.QPointF(xpix+symw,ypix)
poly << QtCore.QPointF(xpix,ypix-symh)
item = StaPoly(poly)
item.setPen(QtGui.QColor(color))
item.setBrush(QtGui.QColor(color))
self.group.addToGroup(item)
我希望上面的片段能够清楚地说明我想要做什么。请注意，显示完全按照我的意愿生成，没有问题 - 但是绘制的多边形没有响应输入事件 - 我没有看到任何证据表明 DragEnterEvent() 正在被调用。
I am trying to connect to the mouse-enter event of QGraphicsItems that are placed onto a QGraphicsScene and visualized through a QGraphicsView. From what I understand, the method to override for this is dragEnterEvent in a class derived from QGraphicsItem (or one of it's subclasses). My attempt looks like this:
class StaPoly(QtGui.QGraphicsPolygonItem):
def __init__(self,*args):
QtGui.QGraphicsPolygonItem.__init__(self,*args)
self.setAcceptDrops(True)
def dragEnterEvent(self,event):
print "Enter!"
...
def draw(self):
p = self.parent
self.group = QtGui.QGraphicsItemGroup(scene=p.scene)
...
for xpix in lons:
poly = QtGui.QPolygonF()
poly << QtCore.QPointF(xpix-symw,ypix)
poly << QtCore.QPointF(xpix,ypix+symh)
poly << QtCore.QPointF(xpix+symw,ypix)
poly << QtCore.QPointF(xpix,ypix-symh)
item = StaPoly(poly)
item.setPen(QtGui.QColor(color))
item.setBrush(QtGui.QColor(color))
self.group.addToGroup(item)
I hope the above snippets make it clear what I am trying to do. Note that the display is generated exactly as I desire, no issue there - however the polygons that get drawn are not responding to the enter-event - I am not seeing any evidence that dragEnterEvent() is being called.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
（部分）解决方案是这样的：
这确保各个项目处理自己的事件，似乎是在组捕获它们之前。
我仍然有一个问题，因为我的 GraphicsView 覆盖了 mouseMoveEvent，并且启用后，没有事件传播到场景项。
编辑：似乎第二个问题的解决方案是从视图 mouseMoveEvent 处理程序调用基类 mouseMoveEvent 处理程序，例如
The (partial) solution was this:
This ensures that individual items handle their own events, it seems that before the group was capturing them.
I still have a problem in that my GraphicsView overrides the mouseMoveEvent, and when enabled, no events get propagated to scene items.
EDIT: And it seems the solution to this second problem was to call the base class mouseMoveEvent handler from the Views mouseMoveEvent handler e.g.