ContentSettings.java revision a1401311d1ab56c4ed0a474bd38c108f75cb0cd9 
1// Copyright 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5package org.chromium.content.browser;
6
7import org.chromium.base.CalledByNative;
8import org.chromium.base.JNINamespace;
9import org.chromium.base.ThreadUtils;
10
11/**
12 * Manages settings state for a ContentView. A ContentSettings instance is obtained
13 * from ContentViewCore.getContentSettings().
14 */
15@JNINamespace("content")
16public class ContentSettings {
17
18    private static final String TAG = "ContentSettings";
19
20    // The native side of this object. Ownership is retained native-side by the WebContents
21    // instance that backs the associated ContentViewCore.
22    private long mNativeContentSettings = 0;
23
24    private ContentViewCore mContentViewCore;
25
26    /**
27     * Package constructor to prevent clients from creating a new settings
28     * instance. Must be called on the UI thread.
29     */
30    ContentSettings(ContentViewCore contentViewCore, long nativeContentView) {
31        ThreadUtils.assertOnUiThread();
32        mContentViewCore = contentViewCore;
33        mNativeContentSettings = nativeInit(nativeContentView);
34        assert mNativeContentSettings != 0;
35    }
36
37    /**
38     * Notification from the native side that it is being destroyed.
39     * @param nativeContentSettings the native instance that is going away.
40     */
41    @CalledByNative
42    private void onNativeContentSettingsDestroyed(long nativeContentSettings) {
43        assert mNativeContentSettings == nativeContentSettings;
44        mNativeContentSettings = 0;
45    }
46
47    /**
48     * Return true if JavaScript is enabled. Must be called on the UI thread.
49     *
50     * @return True if JavaScript is enabled.
51     */
52    public boolean getJavaScriptEnabled() {
53        ThreadUtils.assertOnUiThread();
54        return mNativeContentSettings != 0 ?
55                nativeGetJavaScriptEnabled(mNativeContentSettings) : false;
56    }
57
58    // Initialize the ContentSettings native side.
59    private native long nativeInit(long contentViewPtr);
60
61    private native boolean nativeGetJavaScriptEnabled(long nativeContentSettings);
62}
63