add swipe-away gesture, and fix focus blink.

Bug: 8387448
Change-Id: I316d21069e0b81f1753c975a67f56f95282c2a8a

2 files changed, 85 insertions, 3 deletions

diff --git a/src/com/android/dreams/phototable/EdgeSwipeDetector.java b/src/com/android/dreams/phototable/EdgeSwipeDetector.java
new file mode 100644
index 0000000..98ad6c6
--- /dev/null
+++ b/src/com/android/dreams/phototable/EdgeSwipeDetector.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2013 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.dreams.phototable;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.view.MotionEvent;
+
+/**
+ * Detect and dispatch edge events.
+ */
+public class EdgeSwipeDetector {
+    private static final String TAG = "EdgeSwipeDetector";
+    private float mEdgeSwipeGutter;
+    private float mEdgeSwipeThreshold;
+    private boolean mEdgeSwipe;
+
+    private final PhotoTable mTable;
+
+    public EdgeSwipeDetector(Context context, PhotoTable table) {
+        mTable = table;
+        final Resources resources = context.getResources();
+        mEdgeSwipeGutter = resources.getInteger(R.integer.table_edge_swipe_gutter) / 1000000f;
+        mEdgeSwipeThreshold = resources.getInteger(R.integer.table_edge_swipe_threshold) / 1000000f;
+    }
+
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                float edgeGutter = event.getDevice().getMotionRange(MotionEvent.AXIS_X).getMax()
+                        * mEdgeSwipeGutter;
+                if (event.getX() < edgeGutter) {
+                    mEdgeSwipe = true;
+                    return true;
+                }
+                break;
+
+            case MotionEvent.ACTION_MOVE:
+                if (mEdgeSwipe) {
+                    return true;
+                }
+                break;
+
+            case MotionEvent.ACTION_UP:
+                if (mEdgeSwipe) {
+                    mEdgeSwipe = false;
+                    float enough = event.getDevice().getMotionRange(MotionEvent.AXIS_X).getMax()
+                            * mEdgeSwipeThreshold;
+                    if (event.getX() > enough) {
+                        if (mTable.hasFocus()) {
+                            mTable.fling(mTable.getFocused());
+                        } else if (mTable.hasSelection()) {
+                            mTable.clearSelection();
+                        }
+                    }
+                    return true;
+                }
+                break;
+        }
+        return false;
+    }
+}
diff --git a/src/com/android/dreams/phototable/PhotoTable.java b/src/com/android/dreams/phototable/PhotoTable.java
index e5eb007..a6d5bd7 100644
--- a/src/com/android/dreams/phototable/PhotoTable.java
+++ b/src/com/android/dreams/phototable/PhotoTable.java
@@ -67,6 +67,8 @@ public class PhotoTable extends FrameLayout {
 
     private static final int MAX_SELECTION_TIME = 10000;
     private static final int MAX_FOCUS_TIME = 5000;
+    private static final float EDGE_SWIPE_GUTTER = 0.05f;
+    private static final float EDGE_SWIPE_THRESHOLD = 0.25f;
     private static Random sRNG = new Random();
 
     private final Launcher mLauncher;
@@ -101,6 +103,7 @@ public class PhotoTable extends FrameLayout {
     private View mFocused;
     private long mFocusedTime;
     private int mHighlightColor;
+    private EdgeSwipeDetector mEdgeSwipeDetector;
 
     public PhotoTable(Context context, AttributeSet as) {
         super(context, as);
@@ -128,6 +131,7 @@ public class PhotoTable extends FrameLayout {
                 getContext().getSharedPreferences(PhotoTableDreamSettings.PREFS_NAME, 0));
         mLauncher = new Launcher();
         mFocusReaper = new FocusReaper();
+        mEdgeSwipeDetector = new EdgeSwipeDetector(context, this);
         mStarted = false;
     }
 
@@ -284,8 +288,6 @@ public class PhotoTable extends FrameLayout {
             if (bestFocus == null) {
                 if (angle < 180f) {
                     return moveFocus(focus, direction, 180f);
-                } else {
-                    clearFocus();
                 }
             } else {
                 setFocus(bestFocus);
@@ -362,6 +364,11 @@ public class PhotoTable extends FrameLayout {
     }
 
     @Override
+    public boolean onGenericMotionEvent(MotionEvent event) {
+        return mEdgeSwipeDetector.onTouchEvent(event);
+    }
+
+    @Override
     public boolean onTouchEvent(MotionEvent event) {
         if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
             if (hasSelection()) {
@@ -554,7 +561,7 @@ public class PhotoTable extends FrameLayout {
 
         final float dist = (float) Math.hypot(delta[0], delta[1]);
         final int duration = (int) (1000f * dist / mThrowSpeed);
-        fling (photo, delta[0], delta[1], duration, true, true);
+        fling(photo, delta[0], delta[1], duration, true, true);
     }
 
     public void fling(final View photo, float dx, float dy, int duration,