Drag to pyqtgraph widget

[Leonid Rumatov]

Hello, all!

I want to drag some to pyqtgraph. So, I did this:

class my_pyqtgraph_widget()

  def def dragEnterEvent(self, ev):

       ...

  def dropEvent(self, ev):

    ......

dragEnterEvent worked, but the dropEvent - not invoked. I got this message:

QGraphicsItem::ungrabMouse: not a mouse grabber

I start to dig information in the Internet and found, that I should reimplement this function in QGraphicsScene, not in Widget.

Assume that this is correct, so, I go to the pyqtgraph's GraphicsScene.py. There I found the 

def mouseReleaseEvent(self, ev):

 ...

That, as I can see, handle drag events. But, I can't understand, how to use it.

So, can I use pyqtgraph's specific to handle drag-n-drop, or I must follow pure-Qt way?

[Luke Campagnola]

On Mon, Jan 13, 2014 at 10:32 PM, Leonid Rumatov <dondu...@yandex.ru> wrote:

I want to drag some to pyqtgraph. So, I did this:

class my_pyqtgraph_widget()

  def def dragEnterEvent(self, ev):

       ...

  def dropEvent(self, ev):

    ......

dragEnterEvent worked, but the dropEvent - not invoked. I got this message:

QGraphicsItem::ungrabMouse: not a mouse grabber

What is the superclass of my_pyqtgraph_widget? If it is a QGraphicsView (including pg.GraphicsView and pg.PlotWidget), then you need a few things:

1) call self.setAcceptDrops(True)

2) override dragEnterEvent(event) and make sure to call event.accept()

3) override dragMoveEvent, since QGraphicsView will ignore these by default. 

I start to dig information in the Internet and found, that I should reimplement this function in QGraphicsScene, not in Widget.

Assume that this is correct, so, I go to the pyqtgraph's GraphicsScene.py. There I found the 

You can also implement drops through QGraphicsScene, but I think it's much easier on the widget (unless you want specific items within the scene to receive the drop events)

 

def mouseReleaseEvent(self, ev):

 ...

That, as I can see, handle drag events. But, I can't understand, how to use it.

This is used for handling mouse drags, such as when zooming/panning in a ViewBox, or when dragging ROI handles. It does not interact in any way with Qt's drag/drop system.

More reading here:

http://qt-project.org/doc/qt-4.8/dnd.html

Luke

[Слава]

Hello, Luke.

Thank you for the answer.
I did the drag-n-drop.

In details:
Yep, my_pyqtgraph_widget inherits pg.PlotWidget.
I had to invoke setAcceptDrops(True) for the PlotItem.

This is pure-Qt code.

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Best wishes!
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