| 1 | // Copyright (c) 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 | |
| 5 | package org.chromium.chrome.browser; |
| 6 | |
| 7 | import org.chromium.base.CalledByNative; |
| 8 | import org.chromium.content.browser.ContentView; |
| 9 | import org.chromium.ui.WindowAndroid; |
| 10 | |
| 11 | /** |
| 12 | * The basic Java representation of a tab. Contains and manages a {@link ContentView}. |
| 13 | * |
| 14 | * TabBase provides common functionality for ChromiumTestshell's Tab as well as Chrome on Android's |
| 15 | * tab. It's intended to be extended both on Java and C++, with ownership managed by the subclass. |
| 16 | * Because of the inner-workings of JNI, the subclass is responsible for constructing the native |
| 17 | * subclass which in turn constructs TabAndroid (the native counterpart to TabBase) which in turn |
| 18 | * sets the native pointer for TabBase. The same is true for destruction. The Java subclass must be |
| 19 | * destroyed which will call into the native subclass and finally lead to the destruction of the |
| 20 | * parent classes. |
| 21 | */ |
| 22 | public abstract class TabBase { |
| 23 | public static final int INVALID_TAB_ID = -1; |
| 24 | |
| 25 | private final WindowAndroid mWindowAndroid; |
| 26 | private int mNativeTabAndroid; |
| 27 | |
| 28 | protected TabBase(WindowAndroid window) { |
| 29 | mWindowAndroid = window; |
| 30 | } |
| 31 | |
| 32 | @CalledByNative |
| 33 | private void destroyBase() { |
| 34 | assert mNativeTabAndroid != 0; |
| 35 | mNativeTabAndroid = 0; |
| 36 | } |
| 37 | |
| 38 | @CalledByNative |
| 39 | private void setNativePtr(int nativePtr) { |
| 40 | assert mNativeTabAndroid == 0; |
| 41 | mNativeTabAndroid = nativePtr; |
| 42 | } |
| 43 | |
| 44 | int getNativePtr() { |
| 45 | return mNativeTabAndroid; |
| 46 | } |
| 47 | |
| 48 | protected WindowAndroid getWindowAndroid() { |
| 49 | return mWindowAndroid; |
| 50 | } |
| 51 | } |