1 files changed, 119 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/photoeditor/actions/TouchView.java b/src/com/android/gallery3d/photoeditor/actions/TouchView.java
new file mode 100644
index 000000000..0548cc4b2
--- /dev/null
+++ b/src/com/android/gallery3d/photoeditor/actions/TouchView.java
@@ -0,0 +1,119 @@
+/*
+ * 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.photoeditor.actions;
+
+import android.content.Context;
+import android.graphics.PointF;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+
+/**
+ * A view that detects user gestures and touch motions.
+ */
+class TouchView extends FullscreenToolView {
+
+    /**
+     * Listener of swipes.
+     */
+    public interface SwipeListener {
+
+        void onSwipeLeft();
+
+        void onSwipeRight();
+
+        void onSwipeUp();
+
+        void onSwipeDown();
+    }
+
+    /**
+     * Listener of single tap on a point (relative to photo coordinates).
+     */
+    public interface SingleTapListener {
+
+        void onSingleTap(PointF point);
+    }
+
+    private final GestureDetector gestureDetector;
+
+    private SwipeListener swipeListener;
+    private SingleTapListener singleTapListener;
+
+    public TouchView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        final int swipeThreshold = (int) (500 * getResources().getDisplayMetrics().density);
+        gestureDetector = new GestureDetector(
+                context, new GestureDetector.SimpleOnGestureListener() {
+
+            @Override
+            public boolean onDown(MotionEvent e) {
+                // GestureDetector onTouchEvent returns true for fling events only when their
+                // preceding down events are consumed.
+                return true;
+            }
+
+            @Override
+            public boolean onSingleTapUp(MotionEvent e) {
+                if (singleTapListener != null) {
+                    PointF point = new PointF();
+                    mapPhotoPoint(e.getX(), e.getY(), point);
+                    singleTapListener.onSingleTap(point);
+                }
+                return true;
+            }
+
+            @Override
+            public boolean onFling(
+                    MotionEvent me1, MotionEvent me2, float velocityX, float velocityY) {
+                if (swipeListener != null) {
+                    float absX = Math.abs(velocityX);
+                    float absY = Math.abs(velocityY);
+                    float deltaX = me2.getX() - me1.getX();
+                    float deltaY = me2.getY() - me1.getY();
+                    int travelX = getWidth() / 4;
+                    int travelY = getHeight() / 4;
+                    if (velocityX > swipeThreshold && absY < absX && deltaX > travelX) {
+                        swipeListener.onSwipeRight();
+                    } else if (velocityX < -swipeThreshold && absY < absX && deltaX < -travelX) {
+                        swipeListener.onSwipeLeft();
+                    } else if (velocityY < -swipeThreshold && absX < absY && deltaY < -travelY) {
+                        swipeListener.onSwipeUp();
+                    } else if (velocityY > swipeThreshold && absX < absY / 2 && deltaY > travelY) {
+                        swipeListener.onSwipeDown();
+                    }
+                }
+                return true;
+            }
+        });
+        gestureDetector.setIsLongpressEnabled(false);
+    }
+
+    public void setSwipeListener(SwipeListener listener) {
+        swipeListener = listener;
+    }
+
+    public void setSingleTapListener(SingleTapListener listener) {
+        singleTapListener = listener;
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        return isEnabled() && gestureDetector.onTouchEvent(event);
+    }
+}