Setting the MouseCursor in a Drag and Drop Scenario [SOLVED]

General JUCE discussion
1

Setting the MouseCursor on a DragAndDropTarget/FileDragAndDropTarget while items are being dragged does not work.

I could narrow it down to the part where the MouseInputSourceInternal::componentUnderMouse doesn’t gets updated while dragging.
Is this intended? When so, how can i archieve setting the mouse cursor in this scenario?

2

Yes, when you’re dragging, the mouse is captured by the component you clicked on, so it won’t attempt to look at any components that are being mouse-overed. But if you change the cursor of the original component, that should make it update.

3

That make sense for dragging JUCE components, but what is the original component for an external drag and drop coming from the finder/explorer?

4

Oh, I see… right. Bit more tricky then! I guess you could get the main MouseSource and then call showMouseCursor on it…?

5

That is working!

Thank you, Jules.

6

How do you get the “main” mouse source? I want to achieve the same, but don’t know how :frowning:

7

Have a look at:
MouseInputSource Desktop::getMainMouseSource ()const

1 Like
8

Hmmm I dont see that class method. Is it possible that I am using a universal API in my project an that desktop-only API is hidden?
I am new to JUCE…

EDIT: Ok I now understand getMainMouseSource is a method on Dekstop. But I don’t know how to initialise or somehow get access to a Desktop instance…

9

Access the desktop instance through juce::Desktop::getInstance().

10

Thank you!

Still having problems: Isn’;t the following suposed to work? placed on my Component class:

void SoundwaveRangeSelector::mouseMove(const MouseEvent &event)
{
    MouseCursor dragging = MouseCursor(juce::MouseCursor::StandardCursorType::DraggingHandCursor);
    Desktop::getInstance().getMainMouseSource().showMouseCursor(dragging);
}

void SoundwaveRangeSelector::mouseEnter(const MouseEvent &event)
{
    MouseCursor dragging = MouseCursor(juce::MouseCursor::StandardCursorType::DraggingHandCursor);
    Desktop::getInstance().getMainMouseSource().showMouseCursor(dragging);
}
11

Apparently, there is still an issue setting the mouse cursor while dragging. This caused by new behavior in MouseInputSourceInternal::setPointerState, which prevents setting the component under the mouse while dragging is underway. So, it is not possible to change the mouse cursor for a component that wants to accept a drag.