diff options
Diffstat (limited to 'src/com/android/gallery3d/ui/DownUpDetector.java')
-rw-r--r-- | src/com/android/gallery3d/ui/DownUpDetector.java | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/DownUpDetector.java b/src/com/android/gallery3d/ui/DownUpDetector.java new file mode 100644 index 000000000..19db77262 --- /dev/null +++ b/src/com/android/gallery3d/ui/DownUpDetector.java @@ -0,0 +1,61 @@ +/* + * Copyright (C) 2010 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.android.gallery3d.ui; + +import android.view.MotionEvent; + +public class DownUpDetector { + public interface DownUpListener { + void onDown(MotionEvent e); + void onUp(MotionEvent e); + } + + private boolean mStillDown; + private DownUpListener mListener; + + public DownUpDetector(DownUpListener listener) { + mListener = listener; + } + + private void setState(boolean down, MotionEvent e) { + if (down == mStillDown) return; + mStillDown = down; + if (down) { + mListener.onDown(e); + } else { + mListener.onUp(e); + } + } + + public void onTouchEvent(MotionEvent ev) { + switch (ev.getAction() & MotionEvent.ACTION_MASK) { + case MotionEvent.ACTION_DOWN: + setState(true, ev); + break; + + case MotionEvent.ACTION_UP: + case MotionEvent.ACTION_CANCEL: + case MotionEvent.ACTION_POINTER_DOWN: // Multitouch event - abort. + setState(false, ev); + break; + } + } + + public boolean isDown() { + return mStillDown; + } +} |