[Home] Add a bottom navigation bar for the BottomSheet

chrome/android/java/src/org/chromium/chrome/browser/widget/BottomSheet.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.widget;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ValueAnimator;
 import android.content.Context;
@@ skipping 428 matching lines @@
     public Tab getActiveTab() {
         return mTabModelSelector.getCurrentTab();
     }
 
     @Override
     public boolean isVisible() {
         return mCurrentState != SHEET_STATE_PEEK;
     }
 
     /**
+     * Gets the minimum offset of the bottom sheet.
+     * @return The min offset.
+     */
+    public float getMinOffset() {
+        return getPeekRatio() * mContainerHeight;
+    }
+
+    /**
+     * Gets the sheet's offset from the bottom of the screen.
+     * @return The sheet's distance from the bottom of the screen.
+     */
+    public float getSheetOffsetFromBottom() {
+        return mContainerHeight - getTranslationY();
+    }
+
+    /**
      * Determines if a touch event is inside the toolbar. This assumes the toolbar is the full
      * width of the screen and that the toolbar is at the top of the bottom sheet.
      * @param e The motion event to test.
      * @return True if the event occured in the toolbar region.
      */
     private boolean isTouchEventInToolbar(MotionEvent e) {
         if (mControlContainer == null) return false;
 
         mControlContainer.getLocationInWindow(mLocationArray);
 
@@ skipping 129 matching lines @@
 
     /**
      * Gets the maximum offset of the bottom sheet.
      * @return The max offset.
      */
     private float getMaxOffset() {
         return getFullRatio() * mContainerHeight;
     }
 
     /**
-     * Gets the minimum offset of the bottom sheet.
-     * @return The min offset.
-     */
-    private float getMinOffset() {
-        return getPeekRatio() * mContainerHeight;
-    }
-
-    /**
-     * Gets the sheet's offset from the bottom of the screen.
-     * @return The sheet's distance from the bottom of the screen.
-     */
-    private float getSheetOffsetFromBottom() {
-        return mContainerHeight - getTranslationY();
-    }
-
-    /**
      * Sets the sheet's offset relative to the bottom of the screen.
      * @param offset The offset that the sheet should be.
      */
     private void setSheetOffsetFromBottom(float offset) {
         if (MathUtils.areFloatsEqual(getSheetOffsetFromBottom(), getMinOffset())
                 && offset > getMinOffset()) {
             onSheetOpened();
         } else if (MathUtils.areFloatsEqual(offset, getMinOffset())
                 && getSheetOffsetFromBottom() > getMinOffset()) {
             onSheetClosed();
@@ skipping 181 matching lines @@
     @Override
     public void onFadingViewVisibilityChanged(boolean visible) {}
 
     private boolean canMoveSheet() {
         boolean isInOverviewMode = mTabModelSelector != null
                 && (mTabModelSelector.getCurrentTab() == null
                            || mTabModelSelector.getCurrentTab().getActivity().isInOverviewMode());
         return !isToolbarAndroidViewHidden() && !isInOverviewMode;
     }
 }