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How to limit the movement of shapes [message #1775204]

Thu, 26 October 2017 09:06

xi yahui

Messages: 32
Registered: October 2017

Member

I hope the shapes can only move up or down. That is, the shapes can't move left or right. What should I do?

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Re: How to limit the movement of shapes [message #1775273 is a reply to message #1775204]

Fri, 27 October 2017 06:34

Michael Wenz

Messages: 1931
Registered: July 2009
Location: Walldorf, Germany

Senior Member

Sorry, but I cannot really help based on that scarce information. Shapes can move in all directions, but you may restrict their movement options by providing your own move feature.

Michael

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Re: How to limit the movement of shapes [message #1775292 is a reply to message #1775273]

Fri, 27 October 2017 09:41

xi yahui

Messages: 32
Registered: October 2017

Member

When I move the shape, there is a float shape. When I release the mouse, the real shape will move to the location. I hope the shape and float shape only move up or down. That is to say, only the Y coordinates of the shape can be changed. But the moveShape method of DefaultMoveShapeFeature is invoked after releasing the mouse.
I write the code in the moveShape method:
int x=context.getX();
int deltax=context.getDeltaX();
((MoveShapeContext)context).setX(x-deltax);
((MoveShapeContext)context).setDeltaX(0);
super.moveShape(context);

So, the shape is limited. But how to limit the float shape?

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[Updated on: Fri, 27 October 2017 09:57]

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Re: How to limit the movement of shapes [message #1775302 is a reply to message #1775292]

Fri, 27 October 2017 11:53

Michael Wenz

Messages: 1931
Registered: July 2009
Location: Walldorf, Germany

Senior Member

The position of the float shape will simply follow the mouse pointer, there is no way to influence that. What you could do is override canMoveShape and return false in case the user tries to drag the shape to an invalid place; you could for example allow a corridor of +/- 10 pixels wher you allow the drop. Or you simply change the x coordinate back to the original value in moveShape.

HTH,
Michael

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