diff options
Diffstat (limited to 'src/com/android/launcher2/DropTarget.java')
-rw-r--r-- | src/com/android/launcher2/DropTarget.java | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/com/android/launcher2/DropTarget.java b/src/com/android/launcher2/DropTarget.java index fb714c60a..397d46245 100644 --- a/src/com/android/launcher2/DropTarget.java +++ b/src/com/android/launcher2/DropTarget.java @@ -16,6 +16,7 @@ package com.android.launcher2; +import android.content.Context; import android.graphics.PointF; import android.graphics.Rect; @@ -63,6 +64,43 @@ public interface DropTarget { } } + public static class DragEnforcer implements DragController.DragListener { + int dragParity = 0; + + public DragEnforcer(Context context) { + Launcher launcher = (Launcher) context; + launcher.getDragController().addDragListener(this); + } + + void onDragEnter() { + dragParity++; + if (dragParity != 1) { + throw new RuntimeException("onDragEnter: Drag contract violated: " + dragParity); + } + } + + void onDragExit() { + dragParity--; + if (dragParity != 0) { + throw new RuntimeException("onDragExit: Drag contract violated: " + dragParity); + } + } + + @Override + public void onDragStart(DragSource source, Object info, int dragAction) { + if (dragParity != 0) { + throw new RuntimeException("onDragEnter: Drag contract violated: " + dragParity); + } + } + + @Override + public void onDragEnd() { + if (dragParity != 0) { + throw new RuntimeException("onDragExit: Drag contract violated: " + dragParity); + } + } + } + /** * Used to temporarily disable certain drop targets * |