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added new call back to handle when the dragged view is dropped #31

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added new call back to handle when the dragged view is dropped #31

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20 changes: 18 additions & 2 deletions library/src/main/java/com/jmedeisis/draglinearlayout/DragLinearLayout.java
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,18 @@ public interface OnViewSwapListener {
* No guarantee is made as to which of the two has a lesser/greater position.
*/
void onSwap(View firstView, int firstPosition, View secondView, int secondPosition);

/**
* Invoked after the dragged item is released and dropped into its final position (i.e. the
* finger is lifted off the screen). This is different than {@link this.onSwap()} which gets
* notified everytime the dragged item passes another item in the layout durring drag.
*
* this is useful if you want to only take action when the drag is finished, and not during.
*
* @param originalPosition the original position where the dragged item was picked up
* @param finalPosition the final position where the dragged item is dropped
*/
void onDrop(int originalPosition, int finalPosition);
}

private OnViewSwapListener swapListener;
Expand Down Expand Up @@ -100,6 +112,8 @@ private class DragItem {
private int startVisibility;
private BitmapDrawable viewDrawable;
private int position;
private int originalPosition;
private int finalPosition;
private int startTop;
private int height;
private int totalDragOffset;
Expand All @@ -117,7 +131,8 @@ public void startDetectingOnPossibleDrag(final View view, final int position) {
this.view = view;
this.startVisibility = view.getVisibility();
this.viewDrawable = getDragDrawable(view);
this.position = position;
this.originalPosition = this.position = position;
this.finalPosition = -1;
this.startTop = view.getTop();
this.height = view.getHeight();
this.totalDragOffset = 0;
Expand Down Expand Up @@ -155,7 +170,7 @@ public void stopDetecting() {
view = null;
startVisibility = -1;
viewDrawable = null;
position = -1;
originalPosition = position = -1;
startTop = -1;
height = -1;
totalDragOffset = 0;
Expand Down Expand Up @@ -424,6 +439,7 @@ public void onAnimationEnd(Animator animation) {
}
});
draggedItem.settleAnimation.start();
swapListener.onDrop(draggedItem.originalPosition, draggedItem.position);
}

/**
Expand Down