Add a view to show magnified link preview on Andrdoid.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

 // Copyright (c) 2012 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.content.browser;
 
 import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.os.Build;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.ActionMode;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.webkit.DownloadListener;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 import org.chromium.base.WeakContext;
 import org.chromium.content.app.AppResource;
+import org.chromium.content.browser.accessibility.AccessibilityInjector;
 import org.chromium.content.browser.ContentViewGestureHandler;
+import org.chromium.content.browser.ContentViewGestureHandler.MotionEventDelegate;
 import org.chromium.content.browser.TouchPoint;
 import org.chromium.content.browser.ZoomManager;
 import org.chromium.content.common.CleanupReference;
 import org.chromium.content.common.TraceEvent;
 
-import org.chromium.content.browser.accessibility.AccessibilityInjector;
-import org.chromium.content.browser.ContentViewGestureHandler.MotionEventDelegate;
-
 /**
  * Provides a Java-side 'wrapper' around a WebContent (native) instance.
  * Contains all the major functionality necessary to manage the lifecycle of a ContentView without
  * being tied to the view system.
  */
 @JNINamespace("content")
 public class ContentViewCore implements MotionEventDelegate {
     private static final String TAG = ContentViewCore.class.getName();
 
     // The following constants match the ones in chrome/common/page_transition_types.h.
@@ skipping 110 matching lines @@
     private int mNativeContentViewCore = 0;
 
     private ContentViewGestureHandler mContentViewGestureHandler;
     private ZoomManager mZoomManager;
 
     // Cached page scale factor from native
     private float mNativePageScaleFactor = 1.0f;
     private float mNativeMinimumScale = 1.0f;
     private float mNativeMaximumScale = 1.0f;
 
+    private PopupZoomer mPopupZoomer;
+
     // TODO(klobag): this is to avoid a bug in GestureDetector. With multi-touch,
     // mAlwaysInTapRegion is not reset. So when the last finger is up, onSingleTapUp()
     // will be mistakenly fired.
     private boolean mIgnoreSingleTap;
 
     // Only valid when focused on a text / password field.
     private ImeAdapter mImeAdapter;
 
     // Tracks whether a selection is currently active.  When applied to selected text, indicates
     // whether the last selected text is still highlighted.
@@ skipping 112 matching lines @@
         } else {
             contentDescription = mContext.getResources().getString(
                     AppResource.STRING_CONTENT_VIEW_CONTENT_DESCRIPTION);
         }
         mContainerView.setContentDescription(contentDescription);
 
         mZoomManager = new ZoomManager(context, this);
         mZoomManager.updateMultiTouchSupport();
         mContentViewGestureHandler = new ContentViewGestureHandler(context, this, mZoomManager);
 
+        initPopupZoomer(mContext);
+
         Log.i(TAG, "mNativeContentView=0x"+ Integer.toHexString(mNativeContentViewCore));
     }
 
+    private void initPopupZoomer(Context context){
+        assert AppResource.DIMENSION_LINK_PREVIEW_OVERLAY_RADIUS != 0;
+        mPopupZoomer = new PopupZoomer(context, AppResource.DIMENSION_LINK_PREVIEW_OVERLAY_RADIUS);
+        mContainerView.addView(mPopupZoomer);
+        PopupZoomer.OnTapListener listener = new PopupZoomer.OnTapListener() {
+            @Override
+            public boolean onSingleTap(View v, MotionEvent e) {
+                mContainerView.requestFocus();
+                if (mNativeContentViewCore != 0) {
+                    nativeSingleTap(mNativeContentViewCore, e.getEventTime(), (int) e.getX(),
+                            (int) e.getY(), true);
+                }
+                return true;
+            }
+
+            @Override
+            public boolean onLongPress(View v, MotionEvent e) {
+                if (mNativeContentViewCore != 0) {
+                    nativeLongPress(mNativeContentViewCore, e.getEventTime(), (int) e.getX(),
+                            (int) e.getY(), true);
+                }
+                return true;
+            }
+        };
+        mPopupZoomer.setOnTapListener(listener);
+    }
+
     /**
      * @return Whether the configured personality of this ContentView is {@link #PERSONALITY_VIEW}.
      */
     boolean isPersonalityView() {
         switch (mPersonality) {
             case PERSONALITY_VIEW:
                 return true;
             case PERSONALITY_CHROME:
                 return false;
             default:
@@ skipping 384 matching lines @@
         } else {
             return mContainerViewInternals.super_awakenScrollBars(startDelay, invalidate);
         }
     }
 
     private void handleTapOrPress(
             long timeMs, int x, int y, boolean isLongPress, boolean showPress) {
         //TODO(yusufo):Upstream the rest of the bits about handlerControllers.
         if (!mContainerView.isFocused()) mContainerView.requestFocus();
 
+        if (!mPopupZoomer.isShowing()) mPopupZoomer.setLastTouch(x, y);
+
         if (isLongPress) {
             if (mNativeContentViewCore != 0) {
                 nativeLongPress(mNativeContentViewCore, timeMs, x, y, false);
             }
         } else {
             if (!showPress && mNativeContentViewCore != 0) {
                 nativeShowPressState(mNativeContentViewCore, timeMs, x, y);
             }
             if (mNativeContentViewCore != 0) {
                 nativeSingleTap(mNativeContentViewCore, timeMs, x, y, false);
@@ skipping 497 matching lines @@
 
     private native int nativeEvaluateJavaScript(String script);
 
     private native void nativeAddJavascriptInterface(int nativeContentViewCoreImpl, Object object,
                                                      String name, boolean requireAnnotation);
 
     private native void nativeRemoveJavascriptInterface(int nativeContentViewCoreImpl, String name);
 
     private native int nativeGetNavigationHistory(int nativeContentViewCoreImpl, Object context);
 }