1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.layoutlib.bridge.bars;
18
19import com.android.ide.common.rendering.api.LayoutLog;
20import com.android.ide.common.rendering.api.LayoutlibCallback;
21import com.android.ide.common.rendering.api.RenderResources;
22import com.android.ide.common.rendering.api.ResourceValue;
23import com.android.ide.common.rendering.api.SessionParams;
24import com.android.ide.common.rendering.api.StyleResourceValue;
25import com.android.layoutlib.bridge.Bridge;
26import com.android.layoutlib.bridge.android.BridgeContext;
27import com.android.layoutlib.bridge.impl.ResourceHelper;
28import com.android.resources.ResourceType;
29
30import android.annotation.NonNull;
31import android.annotation.Nullable;
32import android.content.Context;
33import android.graphics.drawable.Drawable;
34import android.view.ContextThemeWrapper;
35import android.view.LayoutInflater;
36import android.view.View;
37import android.widget.FrameLayout;
38
39import java.lang.reflect.InvocationTargetException;
40import java.lang.reflect.Method;
41
42
43/**
44 * Assumes that the AppCompat library is present in the project's classpath and creates an
45 * actionbar around it.
46 */
47public class AppCompatActionBar extends BridgeActionBar {
48
49    private Object mWindowDecorActionBar;
50    private static final String WINDOW_ACTION_BAR_CLASS = "android.support.v7.internal.app.WindowDecorActionBar";
51    // This is used on v23.1.1 and later.
52    private static final String WINDOW_ACTION_BAR_CLASS_NEW = "android.support.v7.app.WindowDecorActionBar";
53    private Class<?> mWindowActionBarClass;
54
55    /**
56     * Inflate the action bar and attach it to {@code parentView}
57     */
58    public AppCompatActionBar(@NonNull BridgeContext context, @NonNull SessionParams params) {
59        super(context, params);
60        int contentRootId = context.getProjectResourceValue(ResourceType.ID,
61                "action_bar_activity_content", 0);
62        View contentView = getDecorContent().findViewById(contentRootId);
63        if (contentView != null) {
64            assert contentView instanceof FrameLayout;
65            setContentRoot((FrameLayout) contentView);
66        } else {
67            // Something went wrong. Create a new FrameLayout in the enclosing layout.
68            FrameLayout contentRoot = new FrameLayout(context);
69            setMatchParent(contentRoot);
70            if (mEnclosingLayout != null) {
71                mEnclosingLayout.addView(contentRoot);
72            }
73            setContentRoot(contentRoot);
74        }
75        try {
76            Class[] constructorParams = {View.class};
77            Object[] constructorArgs = {getDecorContent()};
78            LayoutlibCallback callback = params.getLayoutlibCallback();
79
80            // Check if the old action bar class is present.
81            String actionBarClass = WINDOW_ACTION_BAR_CLASS;
82            try {
83                callback.findClass(actionBarClass);
84            } catch (ClassNotFoundException expected) {
85                // Failed to find the old class, use the newer one.
86                actionBarClass = WINDOW_ACTION_BAR_CLASS_NEW;
87            }
88
89            mWindowDecorActionBar = callback.loadView(actionBarClass,
90                    constructorParams, constructorArgs);
91            mWindowActionBarClass = mWindowDecorActionBar == null ? null :
92                    mWindowDecorActionBar.getClass();
93            setupActionBar();
94        } catch (Exception e) {
95            Bridge.getLog().warning(LayoutLog.TAG_BROKEN,
96                    "Failed to load AppCompat ActionBar with unknown error.", e);
97        }
98    }
99
100    @Override
101    protected ResourceValue getLayoutResource(BridgeContext context) {
102        // We always assume that the app has requested the action bar.
103        return context.getRenderResources().getProjectResource(ResourceType.LAYOUT,
104                "abc_screen_toolbar");
105    }
106
107    @Override
108    protected LayoutInflater getInflater(BridgeContext context) {
109        // Other than the resource resolution part, the code has been taken from the support
110        // library. see code from line 269 onwards in
111        // https://android.googlesource.com/platform/frameworks/support/+/android-5.1.0_r1/v7/appcompat/src/android/support/v7/app/ActionBarActivityDelegateBase.java
112        Context themedContext = context;
113        RenderResources resources = context.getRenderResources();
114        ResourceValue actionBarTheme = resources.findItemInTheme("actionBarTheme", false);
115        if (actionBarTheme != null) {
116            // resolve it, if needed.
117            actionBarTheme = resources.resolveResValue(actionBarTheme);
118        }
119        if (actionBarTheme instanceof StyleResourceValue) {
120            int styleId = context.getDynamicIdByStyle(((StyleResourceValue) actionBarTheme));
121            if (styleId != 0) {
122                themedContext = new ContextThemeWrapper(context, styleId);
123            }
124        }
125        return LayoutInflater.from(themedContext);
126    }
127
128    @Override
129    protected void setTitle(CharSequence title) {
130        if (title != null && mWindowDecorActionBar != null) {
131            Method setTitle = getMethod(mWindowActionBarClass, "setTitle", CharSequence.class);
132            invoke(setTitle, mWindowDecorActionBar, title);
133        }
134    }
135
136    @Override
137    protected void setSubtitle(CharSequence subtitle) {
138        if (subtitle != null && mWindowDecorActionBar != null) {
139            Method setSubtitle = getMethod(mWindowActionBarClass, "setSubtitle", CharSequence.class);
140            invoke(setSubtitle, mWindowDecorActionBar, subtitle);
141        }
142    }
143
144    @Override
145    protected void setIcon(String icon) {
146        // Do this only if the action bar doesn't already have an icon.
147        if (icon != null && !icon.isEmpty() && mWindowDecorActionBar != null) {
148            if (invoke(getMethod(mWindowActionBarClass, "hasIcon"), mWindowDecorActionBar)
149                    == Boolean.TRUE) {
150                Drawable iconDrawable = getDrawable(icon, false);
151                if (iconDrawable != null) {
152                    Method setIcon = getMethod(mWindowActionBarClass, "setIcon", Drawable.class);
153                    invoke(setIcon, mWindowDecorActionBar, iconDrawable);
154                }
155            }
156        }
157    }
158
159    @Override
160    protected void setHomeAsUp(boolean homeAsUp) {
161        if (mWindowDecorActionBar != null) {
162            Method setHomeAsUp = getMethod(mWindowActionBarClass,
163                    "setDefaultDisplayHomeAsUpEnabled", boolean.class);
164            invoke(setHomeAsUp, mWindowDecorActionBar, homeAsUp);
165        }
166    }
167
168    @Override
169    public void createMenuPopup() {
170        // it's hard to add menus to appcompat's actionbar, since it'll use a lot of reflection.
171        // so we skip it for now.
172    }
173
174    @Nullable
175    private static Method getMethod(Class<?> owner, String name, Class<?>... parameterTypes) {
176        try {
177            return owner == null ? null : owner.getMethod(name, parameterTypes);
178        } catch (NoSuchMethodException e) {
179            e.printStackTrace();
180        }
181        return null;
182    }
183
184    @Nullable
185    private static Object invoke(Method method, Object owner, Object... args) {
186        try {
187            return method == null ? null : method.invoke(owner, args);
188        } catch (InvocationTargetException e) {
189            e.printStackTrace();
190        } catch (IllegalAccessException e) {
191            e.printStackTrace();
192        }
193        return null;
194    }
195
196    // TODO: this is duplicated from FrameworkActionBarWrapper$WindowActionBarWrapper
197    @Nullable
198    private Drawable getDrawable(@NonNull String name, boolean isFramework) {
199        RenderResources res = mBridgeContext.getRenderResources();
200        ResourceValue value = res.findResValue(name, isFramework);
201        value = res.resolveResValue(value);
202        if (value != null) {
203            return ResourceHelper.getDrawable(value, mBridgeContext);
204        }
205        return null;
206    }
207}
208