/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.webkit;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.app.ActivityThread;
import android.app.Application;
import android.app.ResourcesManager;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.os.SystemProperties;
import android.os.Trace;
import android.util.SparseArray;
import android.view.DisplayListCanvas;
import android.view.View;
import android.view.ViewRootImpl;
import com.android.internal.util.ArrayUtils;
/**
* Delegate used by the WebView provider implementation to access
* the required framework functionality needed to implement a {@link WebView}.
*
* @hide
*/
@SystemApi
public final class WebViewDelegate {
/* package */ WebViewDelegate() { }
/**
* Listener that gets notified whenever tracing has been enabled/disabled.
*/
public interface OnTraceEnabledChangeListener {
void onTraceEnabledChange(boolean enabled);
}
/**
* Register a callback to be invoked when tracing for the WebView component has been
* enabled/disabled.
*/
public void setOnTraceEnabledChangeListener(final OnTraceEnabledChangeListener listener) {
SystemProperties.addChangeCallback(new Runnable() {
@Override
public void run() {
listener.onTraceEnabledChange(isTraceTagEnabled());
}
});
}
/**
* Returns true if the WebView trace tag is enabled and false otherwise.
*/
public boolean isTraceTagEnabled() {
return Trace.isTagEnabled(Trace.TRACE_TAG_WEBVIEW);
}
/**
* Returns true if the draw GL functor can be invoked (see {@link #invokeDrawGlFunctor})
* and false otherwise.
*/
public boolean canInvokeDrawGlFunctor(View containerView) {
return true;
}
/**
* Invokes the draw GL functor. If waitForCompletion is false the functor
* may be invoked asynchronously.
*
* @param nativeDrawGLFunctor the pointer to the native functor that implements
* system/core/include/utils/Functor.h
*/
public void invokeDrawGlFunctor(View containerView, long nativeDrawGLFunctor,
boolean waitForCompletion) {
ViewRootImpl.invokeFunctor(nativeDrawGLFunctor, waitForCompletion);
}
/**
* Calls the function specified with the nativeDrawGLFunctor functor pointer. This
* functionality is used by the WebView for calling into their renderer from the
* framework display lists.
*
* @param canvas a hardware accelerated canvas (see {@link Canvas#isHardwareAccelerated()})
* @param nativeDrawGLFunctor the pointer to the native functor that implements
* system/core/include/utils/Functor.h
* @throws IllegalArgumentException if the canvas is not hardware accelerated
*/
public void callDrawGlFunction(Canvas canvas, long nativeDrawGLFunctor) {
if (!(canvas instanceof DisplayListCanvas)) {
// Canvas#isHardwareAccelerated() is only true for subclasses of HardwareCanvas.
throw new IllegalArgumentException(canvas.getClass().getName()
+ " is not a DisplayList canvas");
}
((DisplayListCanvas) canvas).drawGLFunctor2(nativeDrawGLFunctor, null);
}
/**
* Calls the function specified with the nativeDrawGLFunctor functor pointer. This
* functionality is used by the WebView for calling into their renderer from the
* framework display lists.
*
* @param canvas a hardware accelerated canvas (see {@link Canvas#isHardwareAccelerated()})
* @param nativeDrawGLFunctor the pointer to the native functor that implements
* system/core/include/utils/Functor.h
* @param releasedRunnable Called when this nativeDrawGLFunctor is no longer referenced by this
* canvas, so is safe to be destroyed.
* @throws IllegalArgumentException if the canvas is not hardware accelerated
*/
public void callDrawGlFunction(@NonNull Canvas canvas, long nativeDrawGLFunctor,
@Nullable Runnable releasedRunnable) {
if (!(canvas instanceof DisplayListCanvas)) {
// Canvas#isHardwareAccelerated() is only true for subclasses of HardwareCanvas.
throw new IllegalArgumentException(canvas.getClass().getName()
+ " is not a DisplayList canvas");
}
((DisplayListCanvas) canvas).drawGLFunctor2(nativeDrawGLFunctor, releasedRunnable);
}
/**
* Detaches the draw GL functor.
*
* @param nativeDrawGLFunctor the pointer to the native functor that implements
* system/core/include/utils/Functor.h
*/
public void detachDrawGlFunctor(View containerView, long nativeDrawGLFunctor) {
ViewRootImpl viewRootImpl = containerView.getViewRootImpl();
if (nativeDrawGLFunctor != 0 && viewRootImpl != null) {
viewRootImpl.detachFunctor(nativeDrawGLFunctor);
}
}
/**
* Returns the package id of the given {@code packageName}.
*/
public int getPackageId(Resources resources, String packageName) {
SparseArray<String> packageIdentifiers =
resources.getAssets().getAssignedPackageIdentifiers();
for (int i = 0; i < packageIdentifiers.size(); i++) {
final String name = packageIdentifiers.valueAt(i);
if (packageName.equals(name)) {
return packageIdentifiers.keyAt(i);
}
}
throw new RuntimeException("Package not found: " + packageName);
}
/**
* Returns the application which is embedding the WebView.
*/
public Application getApplication() {
return ActivityThread.currentApplication();
}
/**
* Returns the error string for the given {@code errorCode}.
*/
public String getErrorString(Context context, int errorCode) {
return LegacyErrorStrings.getString(errorCode, context);
}
/**
* Adds the WebView asset path to {@link android.content.res.AssetManager}.
*/
public void addWebViewAssetPath(Context context) {
final String newAssetPath = WebViewFactory.getLoadedPackageInfo().applicationInfo.sourceDir;
final ApplicationInfo appInfo = context.getApplicationInfo();
final String[] libs = appInfo.sharedLibraryFiles;
if (!ArrayUtils.contains(libs, newAssetPath)) {
// Build the new library asset path list.
final int newLibAssetsCount = 1 + (libs != null ? libs.length : 0);
final String[] newLibAssets = new String[newLibAssetsCount];
if (libs != null) {
System.arraycopy(libs, 0, newLibAssets, 0, libs.length);
}
newLibAssets[newLibAssetsCount - 1] = newAssetPath;
// Update the ApplicationInfo object with the new list.
// We know this will persist and future Resources created via ResourcesManager
// will include the shared library because this ApplicationInfo comes from the
// underlying LoadedApk in ContextImpl, which does not change during the life of the
// application.
appInfo.sharedLibraryFiles = newLibAssets;
// Update existing Resources with the WebView library.
ResourcesManager.getInstance().appendLibAssetForMainAssetPath(
appInfo.getBaseResourcePath(), newAssetPath);
}
}
}