Implement Android WebView BlockNetworkImages

content/public/android/java/src/org/chromium/content/browser/ContentSettings.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.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.webkit.WebSettings.PluginState;
@@ skipping 62 matching lines @@
     private String mCursiveFontFamily = "cursive";
     private String mFantasyFontFamily = "fantasy";
     // FIXME: Should be obtained from Android. Problem: it is hidden.
     private String mDefaultTextEncoding = "Latin-1";
     private String mUserAgent;
     private int mMinimumFontSize = 8;
     private int mMinimumLogicalFontSize = 8;
     private int mDefaultFontSize = 16;
     private int mDefaultFixedFontSize = 13;
     private boolean mLoadsImagesAutomatically = true;
+    private boolean mImagesEnabled = true;
     private boolean mJavaScriptEnabled = false;
     private boolean mAllowUniversalAccessFromFileURLs = false;
     private boolean mAllowFileAccessFromFileURLs = false;
     private boolean mJavaScriptCanOpenWindowsAutomatically = false;
     private PluginState mPluginState = PluginState.OFF;
     private boolean mDomStorageEnabled = false;
     private boolean mAllowFileUrlAccess = true;
     private boolean mAllowContentUrlAccess = true;
 
     // Not accessed by the native side.
@@ skipping 623 matching lines @@
         synchronized (mContentSettingsLock) {
             if (mAllowFileAccessFromFileURLs != flag) {
                 mAllowFileAccessFromFileURLs = flag;
                 mEventHandler.syncSettingsLocked();
             }
         }
     }
 
     /**
      * Tell the WebView to load image resources automatically.
+     * Note that setting this flag to false this does not block image loads
+     * from WebCore cache.
      * @param flag True if the WebView should load images automatically.
      */
     public void setLoadsImagesAutomatically(boolean flag) {
         assert mCanModifySettings;
         synchronized (mContentSettingsLock) {
             if (mLoadsImagesAutomatically != flag) {
                 mLoadsImagesAutomatically = flag;
                 mEventHandler.syncSettingsLocked();
             }
         }
     }
 
     /**
      * Return true if the WebView will load image resources automatically.
      * The default is true.
      * @return True if the WebView loads images automatically.
      */
     public boolean getLoadsImagesAutomatically() {
         synchronized (mContentSettingsLock) {
             return mLoadsImagesAutomatically;
         }
     }
 
     /**
+     * Sets whether images are enabled for this WebView. Setting this from
+     * false to true will reload the blocked images in place.
+     * Note that unlike {@link #setLoadsImagesAutomatically}, setting this
+     * flag to false this will block image loads from WebCore cache as well.
+     * The default is true.
+     * @param flag whether the WebView should enable images.
+     */
+    public void setImagesEnabled(boolean flag) {
+        assert mCanModifySettings;
+        synchronized (mContentSettingsLock) {
+            if (mImagesEnabled != flag) {
+                mImagesEnabled = flag;
+                mEventHandler.syncSettingsLocked();
+            }
+        }
+    }
+
+    /**
+     * Gets whether images are enabled for this WebView.
+     * @return true if the WebView has images eanbled
+     */
+    public boolean getImagesEnabled() {
+        synchronized (mContentSettingsLock) {
+            return mImagesEnabled;
+        }
+    }
+
+    /**
      * Return true if JavaScript is enabled. <b>Note: The default is false.</b>
      *
      * @return True if JavaScript is enabled.
      */
     public boolean getJavaScriptEnabled() {
         synchronized (mContentSettingsLock) {
             return mJavaScriptEnabled;
         }
     }
 
@@ skipping 208 matching lines @@
     private static native void nativeDestroy(int nativeContentSettings);
 
     private static native String nativeGetDefaultUserAgent();
 
     // Synchronize Java settings from native settings.
     private native void nativeSyncFromNative(int nativeContentSettings);
 
     // Synchronize native settings from Java settings.
     private native void nativeSyncToNative(int nativeContentSettings);
 }