1 files changed, 95 insertions, 0 deletions
diff --git a/src/com/android/messaging/ui/PagingAwareViewPager.java b/src/com/android/messaging/ui/PagingAwareViewPager.java
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+++ b/src/com/android/messaging/ui/PagingAwareViewPager.java
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+/*
+ * Copyright (C) 2015 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.messaging.ui;
+
+import android.content.Context;
+import android.support.v4.view.PagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+
+import com.android.messaging.util.UiUtils;
+
+/**
+ * A simple extension on the standard ViewPager which lets you turn paging on/off.
+ */
+public class PagingAwareViewPager extends ViewPager {
+    private boolean mPagingEnabled = true;
+
+    public PagingAwareViewPager(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void setCurrentItem(int item, boolean smoothScroll) {
+        super.setCurrentItem(getRtlPosition(item), smoothScroll);
+    }
+
+    @Override
+    public void setCurrentItem(int item) {
+        super.setCurrentItem(getRtlPosition(item));
+    }
+
+    @Override
+    public int getCurrentItem() {
+        int position = super.getCurrentItem();
+        return getRtlPosition(position);
+    }
+
+    /**
+     * Switches position in pager to be adjusted for if we are in RtL mode
+     *
+     * @param position
+     * @return position adjusted if in rtl mode
+     */
+    protected int getRtlPosition(final int position) {
+        final PagerAdapter adapter = getAdapter();
+        if (adapter != null && UiUtils.isRtlMode()) {
+            return adapter.getCount() - 1 - position;
+        }
+        return position;
+    }
+
+    @Override
+    public boolean onTouchEvent(final MotionEvent event) {
+        if (!mPagingEnabled) {
+            return false;
+        }
+        return super.onTouchEvent(event);
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(final MotionEvent event) {
+        if (!mPagingEnabled) {
+            return false;
+        }
+        return super.onInterceptTouchEvent(event);
+    }
+
+    public void setPagingEnabled(final boolean enabled) {
+        this.mPagingEnabled = enabled;
+    }
+
+    /** This prevents touch-less scrolling eg. while doing accessibility navigation. */
+    @Override
+    public boolean canScrollHorizontally(int direction) {
+        if (mPagingEnabled) {
+            return super.canScrollHorizontally(direction);
+        } else {
+            return false;
+        }
+    }
+}