Implement drag to remove contacts in SpeedDialFragment.

Bug: 36841782
Test: manual
PiperOrigin-RevId: 192828773
Change-Id: Id9066346e6b2a03f672ce3ad11027f15adfbb7e6

3 files changed, 230 insertions, 0 deletions

diff --git a/java/com/android/dialer/speeddial/draghelper/SpeedDialFavoritesViewHolderOnTouchListener.java b/java/com/android/dialer/speeddial/draghelper/SpeedDialFavoritesViewHolderOnTouchListener.java
new file mode 100644
index 000000000..00fecd788
--- /dev/null
+++ b/java/com/android/dialer/speeddial/draghelper/SpeedDialFavoritesViewHolderOnTouchListener.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2018 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.dialer.speeddial.draghelper;
+
+import android.support.v7.widget.RecyclerView.ViewHolder;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.view.HapticFeedbackConstants;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+import android.view.ViewConfiguration;
+import com.android.dialer.common.Assert;
+
+/** OnTouchListener for the {@link com.android.dialer.speeddial.FavoritesViewHolder}. */
+public class SpeedDialFavoritesViewHolderOnTouchListener implements OnTouchListener {
+
+  private final ViewConfiguration configuration;
+  private final ItemTouchHelper itemTouchHelper;
+  private final ViewHolder viewHolder;
+  private final OnTouchFinishCallback onTouchFinishCallback;
+
+  private boolean hasPerformedLongClick;
+  private float startX;
+  private float startY;
+
+  public SpeedDialFavoritesViewHolderOnTouchListener(
+      ViewConfiguration configuration,
+      ItemTouchHelper itemTouchHelper,
+      ViewHolder viewHolder,
+      OnTouchFinishCallback onTouchFinishCallback) {
+    this.configuration = configuration;
+    this.itemTouchHelper = itemTouchHelper;
+    this.viewHolder = viewHolder;
+    this.onTouchFinishCallback = onTouchFinishCallback;
+  }
+
+  @Override
+  public boolean onTouch(View v, MotionEvent event) {
+    switch (event.getAction()) {
+      case MotionEvent.ACTION_DOWN:
+        startX = event.getX();
+        startY = event.getY();
+        return true;
+      case MotionEvent.ACTION_MOVE:
+        // If the user has long clicked the view
+        if (event.getEventTime() - event.getDownTime() > ViewConfiguration.getLongPressTimeout()) {
+          // Perform long click if we haven't already
+          if (!hasPerformedLongClick) {
+            v.performLongClick();
+            v.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+            hasPerformedLongClick = true;
+          } else if (moveEventExceedsTouchSlop(event)) {
+            itemTouchHelper.startDrag(viewHolder);
+            onTouchFinishCallback.onTouchFinished(true);
+          }
+        }
+        return true;
+      case MotionEvent.ACTION_UP:
+        if (event.getEventTime() - event.getDownTime() < ViewConfiguration.getLongPressTimeout()) {
+          v.performClick();
+        }
+        // fallthrough
+      case MotionEvent.ACTION_CANCEL:
+        hasPerformedLongClick = false;
+        onTouchFinishCallback.onTouchFinished(false);
+        return true;
+      default:
+        return false;
+    }
+  }
+
+  private boolean moveEventExceedsTouchSlop(MotionEvent event) {
+    Assert.checkArgument(event.getAction() == MotionEvent.ACTION_MOVE);
+    if (event.getHistorySize() <= 0) {
+      return false;
+    }
+
+    return Math.abs(startX - event.getX()) > configuration.getScaledTouchSlop()
+        || Math.abs(startY - event.getY()) > configuration.getScaledTouchSlop();
+  }
+
+  /** Callback to listen for on touch events ending. */
+  public interface OnTouchFinishCallback {
+
+    /**
+     * Called when the user stops touching the view.
+     *
+     * @see MotionEvent#ACTION_UP
+     * @see MotionEvent#ACTION_CANCEL
+     */
+    void onTouchFinished(boolean closeContextMenu);
+  }
+}
diff --git a/java/com/android/dialer/speeddial/draghelper/SpeedDialItemTouchHelperCallback.java b/java/com/android/dialer/speeddial/draghelper/SpeedDialItemTouchHelperCallback.java
new file mode 100644
index 000000000..d1d9f478b
--- /dev/null
+++ b/java/com/android/dialer/speeddial/draghelper/SpeedDialItemTouchHelperCallback.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 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.dialer.speeddial.draghelper;
+
+import android.support.annotation.NonNull;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.ViewHolder;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/** {@link ItemTouchHelper} for Speed Dial favorite contacts. */
+public class SpeedDialItemTouchHelperCallback extends ItemTouchHelper.Callback {
+
+  private final ItemTouchHelperAdapter adapter;
+
+  public SpeedDialItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
+    this.adapter = adapter;
+  }
+
+  @Override
+  public boolean isLongPressDragEnabled() {
+    // We'll manually call ItemTouchHelper#startDrag
+    return false;
+  }
+
+  @Override
+  public boolean isItemViewSwipeEnabled() {
+    // We don't want to enable swiping
+    return false;
+  }
+
+  @Override
+  public boolean canDropOver(
+      @NonNull RecyclerView recyclerView, @NonNull ViewHolder current, @NonNull ViewHolder target) {
+    return adapter.canDropOver(target);
+  }
+
+  @Override
+  public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull ViewHolder viewHolder) {
+    if (!adapter.canDropOver(viewHolder)) {
+      return makeMovementFlags(0, 0);
+    }
+
+    int dragFlags =
+        ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.START | ItemTouchHelper.END;
+    return makeMovementFlags(dragFlags, /* swipeFlags */ 0);
+  }
+
+  @Override
+  public boolean onMove(
+      @NonNull RecyclerView recyclerView,
+      @NonNull ViewHolder viewHolder,
+      @NonNull ViewHolder target) {
+    adapter.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
+    return true;
+  }
+
+  @Override
+  public void onSwiped(@NonNull ViewHolder viewHolder, int direction) {
+    // No-op since we don't support swiping
+  }
+
+  /** RecyclerView adapters interested in drag and drop should implement this interface. */
+  public interface ItemTouchHelperAdapter {
+
+    void onItemMove(int fromPosition, int toPosition);
+
+    boolean canDropOver(ViewHolder target);
+  }
+}
diff --git a/java/com/android/dialer/speeddial/draghelper/SpeedDialLayoutManager.java b/java/com/android/dialer/speeddial/draghelper/SpeedDialLayoutManager.java
new file mode 100644
index 000000000..fcc925186
--- /dev/null
+++ b/java/com/android/dialer/speeddial/draghelper/SpeedDialLayoutManager.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2017 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.dialer.speeddial.draghelper;
+
+import android.content.Context;
+import android.support.v7.widget.GridLayoutManager;
+
+/** {@link GridLayoutManager} that allows disabling scrolling. */
+public class SpeedDialLayoutManager extends GridLayoutManager {
+
+  private boolean isScrollEnabled = true;
+
+  public SpeedDialLayoutManager(Context context, int spanCount) {
+    super(context, spanCount);
+  }
+
+  public void setScrollEnabled(boolean flag) {
+    this.isScrollEnabled = flag;
+  }
+
+  @Override
+  public boolean canScrollVertically() {
+    // Similarly you can customize "canScrollHorizontally()" for managing horizontal scroll
+    return isScrollEnabled && super.canScrollVertically();
+  }
+}