[Home] Record some user actions for the Chrome Home BottomSheet

chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java

 // Copyright 2016 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.toolbar;
 
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.support.v7.widget.Toolbar;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetObserver;
+import org.chromium.chrome.browser.widget.bottomsheet.EmptyBottomSheetObserver;
 
 /**
  * Phone specific toolbar that exists at the bottom of the screen.
  */
-public class BottomToolbarPhone extends ToolbarPhone implements BottomSheetObserver {
+public class BottomToolbarPhone extends ToolbarPhone {
+    /**
+     * The observer used to listen to {@link BottomSheet} events.
+     */
+    private final BottomSheetObserver mBottomSheetObserver = new EmptyBottomSheetObserver() {
+        @Override
+        public void onTransitionPeekToHalf(float transitionFraction) {
+            // TODO(twellington): animate end toolbar button appearance/disappearance.
+            if (transitionFraction >= 0.5 && !mShouldHideEndToolbarButtons) {
+                mShouldHideEndToolbarButtons = true;
+                updateUrlExpansionAnimation();
+            } else if (transitionFraction < 0.5 && mShouldHideEndToolbarButtons) {
+                mShouldHideEndToolbarButtons = false;
+                updateUrlExpansionAnimation();
+            }
+
+            boolean buttonsClickable = transitionFraction == 0.f;
+            mToggleTabStackButton.setClickable(buttonsClickable);
+            mMenuButton.setClickable(buttonsClickable);
+        }
+
+        @Override
+        public void onSheetOffsetChanged(float heightFraction) {
+            boolean isMovingDown = heightFraction < mLastHeightFraction;
+            mLastHeightFraction = heightFraction;
+
+            // The only time the omnibox should have focus is when the sheet is fully expanded. Any
+            // movement of the sheet should unfocus it.
+            if (isMovingDown && getLocationBar().isUrlBarFocused()) {
+                getLocationBar().setUrlBarFocus(false);
+            }
+        }
+    };
+
     /** The white version of the toolbar handle; used for dark themes and incognito. */
     private final Bitmap mHandleLight;
 
     /** The dark version of the toolbar handle; this is the default handle to use. */
     private final Bitmap mHandleDark;
 
     /** A handle to the bottom sheet. */
     private BottomSheet mBottomSheet;
 
     /**
@@ skipping 42 matching lines @@
 
         mBottomSheet.setSheetState(BottomSheet.SHEET_STATE_FULL, true);
     }
 
     @Override
     public void setBottomSheet(BottomSheet sheet) {
         assert mBottomSheet == null;
 
         mBottomSheet = sheet;
         getLocationBar().setBottomSheet(mBottomSheet);
-        mBottomSheet.addObserver(this);
+        mBottomSheet.addObserver(mBottomSheetObserver);
     }
 
     @Override
     public boolean shouldIgnoreSwipeGesture() {
         // Only detect swipes if the bottom sheet in the peeking state and not animating.
         return mBottomSheet.getSheetState() != BottomSheet.SHEET_STATE_PEEK
                 || mBottomSheet.isRunningSettleAnimation() || super.shouldIgnoreSwipeGesture();
     }
 
     @Override
@@ skipping 87 matching lines @@
         canvas.drawRoundRect(rect, handleHeight / 2f, handleHeight / 2f, paint);
 
         return handle;
     }
 
     @Override
     protected boolean shouldHideEndToolbarButtons() {
         return mShouldHideEndToolbarButtons;
     }
 
-    @Override
-    public void onSheetOpened() {}
-
-    @Override
-    public void onSheetClosed() {}
-
-    @Override
-    public void onLoadUrl(String url) {}
-
-    @Override
-    public void onTransitionPeekToHalf(float transitionFraction) {
-        // TODO(twellington): animate end toolbar button appearance/disappearance.
-        if (transitionFraction >= 0.5 && !mShouldHideEndToolbarButtons) {
-            mShouldHideEndToolbarButtons = true;
-            updateUrlExpansionAnimation();
-        } else if (transitionFraction < 0.5 && mShouldHideEndToolbarButtons) {
-            mShouldHideEndToolbarButtons = false;
-            updateUrlExpansionAnimation();
-        }
-
-        boolean buttonsClickable = transitionFraction == 0.f;
-        mToggleTabStackButton.setClickable(buttonsClickable);
-        mMenuButton.setClickable(buttonsClickable);
-    }
-
-    @Override
-    public void onSheetOffsetChanged(float heightFraction) {
-        boolean isMovingDown = heightFraction < mLastHeightFraction;
-        mLastHeightFraction = heightFraction;
-
-        // The only time the omnibox should have focus is when the sheet is fully expanded. Any
-        // movement of the sheet should unfocus it.
-        if (isMovingDown && getLocationBar().isUrlBarFocused()) {
-            getLocationBar().setUrlBarFocus(false);
-        }
-    }
-
     /**
      * Sets the height and title text appearance of the provided toolbar so that its style is
      * consistent with BottomToolbarPhone.
      * @param otherToolbar The other {@link Toolbar} to style.
      */
     public void setOtherToolbarStyle(Toolbar otherToolbar) {
         // Android's Toolbar class typically changes its height based on device orientation.
         // BottomToolbarPhone has a fixed height. Update |toolbar| to match.
         otherToolbar.getLayoutParams().height = getHeight();
 
         // Android Toolbar action buttons are aligned based on the minimum height.
         int extraTopMargin = getExtraTopMargin();
         otherToolbar.setMinimumHeight(getHeight() - extraTopMargin);
 
         otherToolbar.setTitleTextAppearance(
                 otherToolbar.getContext(), R.style.BottomSheetContentTitle);
         ApiCompatibilityUtils.setPaddingRelative(otherToolbar,
                 ApiCompatibilityUtils.getPaddingStart(otherToolbar),
                 otherToolbar.getPaddingTop() + extraTopMargin,
                 ApiCompatibilityUtils.getPaddingEnd(otherToolbar), otherToolbar.getPaddingBottom());
 
         otherToolbar.requestLayout();
     }
 }