how to know if mouse dragged left or right inside jpanel in java

Question

I have mouseMotionListener in my jpanel code.

But how can I know if the mouse dragged to left or right inside the jpanel?

You'ld need to put previous X and Y coordinates in variables/object, and then compare to the new values. — AntonH, Mar 17 '14 at 12:57
Have you tried reading [some documentation on it](http://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html)?? Or looked at some existing [question](http://stackoverflow.com/questions/15574065/java-mousedragged-and-moving-around-in-a-graphical-interface) (and there's a lot more of them)? — Jonathan Drapeau, Mar 17 '14 at 13:03

score 0 · Answer 1 · answered Mar 17 '14 at 12:58

0

In the event callback: store the mouse-(x-)position, in the next callback calculate the difference to the previous position (and store the position again); depending on the sign(um) you can determine whether it was a left or right drag.

answered Mar 17 '14 at 12:58

Tedil

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32

score 0 · Accepted Answer · answered Mar 17 '14 at 13:01

0

Use

if (currentX > previousX) {
    // Right
} else {
    // Left
}
previousX = currentX;

in your listener.

Hope this helps.

answered Mar 17 '14 at 13:01

Tanmay Patil

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45

Glad to know it helped. – Tanmay Patil Mar 17 '14 at 13:19

how to know if mouse dragged left or right inside jpanel in java

2 Answers2