From 4b94060491eb14f4f1d40b86012414910325751a Mon Sep 17 00:00:00 2001
From: Michael Jurka <mikejurka@google.com>
Date: Thu, 5 Sep 2013 12:14:12 +0200
Subject: Show and hide the wallpaper list in response to touch

---
 res/layout/wallpaper_picker.xml                    |  1 +
 src/com/android/launcher3/CropView.java            | 41 ++++++++++++++++++++--
 .../android/launcher3/WallpaperPickerActivity.java | 30 ++++++++++++++++
 3 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/res/layout/wallpaper_picker.xml b/res/layout/wallpaper_picker.xml
index 493606da5..347a63e75 100644
--- a/res/layout/wallpaper_picker.xml
+++ b/res/layout/wallpaper_picker.xml
@@ -37,6 +37,7 @@
         android:indeterminateOnly="true"
         android:background="@android:color/transparent" />
     <HorizontalScrollView
+        android:id="@+id/wallpaper_strip"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true" >
diff --git a/src/com/android/launcher3/CropView.java b/src/com/android/launcher3/CropView.java
index 25ab5cdad..6d29be2af 100644
--- a/src/com/android/launcher3/CropView.java
+++ b/src/com/android/launcher3/CropView.java
@@ -22,6 +22,7 @@ import android.graphics.RectF;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
+import android.view.ViewConfiguration;
 import android.view.ScaleGestureDetector.OnScaleGestureListener;
 import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnGlobalLayoutListener;
@@ -32,10 +33,18 @@ import com.android.photos.views.TiledImageView;
 public class CropView extends TiledImageView implements OnScaleGestureListener {
 
     private ScaleGestureDetector mScaleGestureDetector;
+    private long mTouchDownTime;
+    private float mFirstX, mFirstY;
     private float mLastX, mLastY;
     private float mMinScale;
     private boolean mTouchEnabled = true;
     private RectF mTempEdges = new RectF();
+    TouchCallback mTouchCallback;
+
+    public interface TouchCallback {
+        void onTouchDown();
+        void onTap();
+    }
 
     public CropView(Context context) {
         this(context, null);
@@ -152,11 +161,12 @@ public class CropView extends TiledImageView implements OnScaleGestureListener {
         mTouchEnabled = enabled;
     }
 
+    public void setTouchCallback(TouchCallback cb) {
+        mTouchCallback = cb;
+    }
+
     @Override
     public boolean onTouchEvent(MotionEvent event) {
-        if (!mTouchEnabled) {
-            return true;
-        }
         int action = event.getActionMasked();
         final boolean pointerUp = action == MotionEvent.ACTION_POINTER_UP;
         final int skipIndex = pointerUp ? event.getActionIndex() : -1;
@@ -174,6 +184,31 @@ public class CropView extends TiledImageView implements OnScaleGestureListener {
         float x = sumX / div;
         float y = sumY / div;
 
+        if (action == MotionEvent.ACTION_DOWN) {
+            mFirstX = x;
+            mFirstY = y;
+            mTouchDownTime = System.currentTimeMillis();
+            if (mTouchCallback != null) {
+                mTouchCallback.onTouchDown();
+            }
+        } else if (action == MotionEvent.ACTION_UP) {
+            ViewConfiguration config = ViewConfiguration.get(getContext());
+
+            float squaredDist = (mFirstX - x) * (mFirstX - x) + (mFirstY - y) * (mFirstY - y);
+            float slop = config.getScaledTouchSlop() * config.getScaledTouchSlop();
+            long now = System.currentTimeMillis();
+            // only do this if it's a small movement
+            if (mTouchCallback != null &&
+                    squaredDist < slop &&
+                    now < mTouchDownTime + ViewConfiguration.getTapTimeout()) {
+                mTouchCallback.onTap();
+            }
+        }
+
+        if (!mTouchEnabled) {
+            return true;
+        }
+
         synchronized (mLock) {
             mScaleGestureDetector.onTouchEvent(event);
             switch (action) {
diff --git a/src/com/android/launcher3/WallpaperPickerActivity.java b/src/com/android/launcher3/WallpaperPickerActivity.java
index 8f323e809..b7226f61b 100644
--- a/src/com/android/launcher3/WallpaperPickerActivity.java
+++ b/src/com/android/launcher3/WallpaperPickerActivity.java
@@ -45,6 +45,7 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.WindowManager;
+import android.view.animation.DecelerateInterpolator;
 import android.widget.BaseAdapter;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
@@ -71,6 +72,7 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
 
     private View mSelectedThumb;
     private CropView mCropView;
+    private boolean mIgnoreNextTap;
 
     private static class ThumbnailMetaData {
         public boolean mLaunchesGallery;
@@ -181,6 +183,34 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
         setContentView(R.layout.wallpaper_picker);
 
         mCropView = (CropView) findViewById(R.id.cropView);
+        final View wallpaperStrip = findViewById(R.id.wallpaper_strip);
+        mCropView.setTouchCallback(new CropView.TouchCallback() {
+            LauncherViewPropertyAnimator mAnim;
+            public void onTouchDown() {
+                if (mAnim != null) {
+                    mAnim.cancel();
+                }
+                if (wallpaperStrip.getTranslationY() == 0) {
+                    mIgnoreNextTap = true;
+                }
+                mAnim = new LauncherViewPropertyAnimator(wallpaperStrip);
+                mAnim.translationY(wallpaperStrip.getHeight())
+                    .setInterpolator(new DecelerateInterpolator(0.75f));
+                mAnim.start();
+            }
+            public void onTap() {
+                boolean ignoreTap = mIgnoreNextTap;
+                mIgnoreNextTap = false;
+                if (!ignoreTap) {
+                    if (mAnim != null) {
+                        mAnim.cancel();
+                    }
+                    mAnim = new LauncherViewPropertyAnimator(wallpaperStrip);
+                    mAnim.translationY(0).setInterpolator(new DecelerateInterpolator(0.75f));
+                    mAnim.start();
+                }
+            }
+        });
 
         // Populate the built-in wallpapers
         findWallpapers();
-- 
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