Example usage for android.view DragEvent getAction

Introduction

In this page you can find the example usage for android.view DragEvent getAction.

Prototype

public int getAction() 

Source Link

Document

Inspect the action value of this event.

Usage

From source file:app.umitems.greenclock.widget.sgv.StaggeredGridView.java

@Override
public boolean onDragEvent(DragEvent ev) {
    if (!isDragReorderingSupported()) {
        // If the consumer of this StaggeredGridView has not registered a ReorderListener,
        // don't bother handling drag events.
        return false;
    }//from ww  w .j  a  v  a  2  s.  co  m

    final int x = (int) ev.getX();
    final int y = (int) ev.getY();

    switch (ev.getAction()) {
    case DragEvent.ACTION_DRAG_LOCATION:
        if (mDragState == ReorderUtils.DRAG_STATE_DRAGGING) {
            handleDrag(x, y);
            mLastTouchY = y;
        }

        // Kick off the scroll handler on the first drag location event,
        // if it's not already running
        if (!mIsDragScrollerRunning &&
        // And if the distance traveled while dragging exceeds the touch slop
                ((Math.abs(x - mTouchDownForDragStartX) >= 4 * mTouchSlop)
                        || (Math.abs(y - mTouchDownForDragStartY) >= 4 * mTouchSlop))) {
            // Set true because that the scroller is running now
            mIsDragScrollerRunning = true;

            if (mScrollHandler == null) {
                mScrollHandler = getHandler();
            }
            mScrollHandler.postDelayed(mDragScroller, SCROLL_HANDLER_DELAY);
        }

        return true;

    case DragEvent.ACTION_DROP:
    case DragEvent.ACTION_DRAG_ENDED:
        // We can either expect to receive:
        // 1. Both {@link DragEvent#ACTION_DROP} and then
        //    {@link DragEvent#ACTION_DRAG_ENDED} if the drop is over this view.
        // 2. Only {@link DragEvent#ACTION_DRAG_ENDED} if the drop happened over a
        //    different view.
        // For this reason, we should always handle the drop. In case #1, if this code path
        // gets executed again then nothing will happen because we will have already
        // updated {@link #mDragState} to not be {@link ReorderUtils#DRAG_STATE_DRAGGING}.
        if (mScrollHandler != null) {
            mScrollHandler.removeCallbacks(mDragScroller);
            // Scroller is no longer running
            mIsDragScrollerRunning = false;
        }

        return true;
    }

    return false;
}

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