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;
+    }
+}