// 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.ui;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.View;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import org.chromium.base.CalledByNative;
import org.chromium.base.JNINamespace;
/**
* The window base class that has the minimum functionality.
*/
@JNINamespace("ui")
public class WindowAndroid {
private static final String TAG = "WindowAndroid";
// Native pointer to the c++ WindowAndroid object.
private int mNativeWindowAndroid = 0;
// Constants used for intent request code bounding.
private static final int REQUEST_CODE_PREFIX = 1000;
private static final int REQUEST_CODE_RANGE_SIZE = 100;
// A string used as a key to store intent errors in a bundle
static final String WINDOW_CALLBACK_ERRORS = "window_callback_errors";
private int mNextRequestCode = 0;
protected Activity mActivity;
protected Context mApplicationContext;
protected SparseArray<IntentCallback> mOutstandingIntents;
protected HashMap<Integer, String> mIntentErrors;
/**
* @param activity
*/
public WindowAndroid(Activity activity) {
mActivity = activity;
mApplicationContext = mActivity.getApplicationContext();
mOutstandingIntents = new SparseArray<IntentCallback>();
mIntentErrors = new HashMap<Integer, String>();
}
/**
* Shows an intent and returns the results to the callback object.
* @param intent The intent that needs to be showed.
* @param callback The object that will receive the results for the intent.
* @param errorId The ID of error string to be show if activity is paused before intent
* results.
* @return Whether the intent was shown.
*/
public boolean showIntent(Intent intent, IntentCallback callback, int errorId) {
int requestCode = REQUEST_CODE_PREFIX + mNextRequestCode;
mNextRequestCode = (mNextRequestCode + 1) % REQUEST_CODE_RANGE_SIZE;
try {
mActivity.startActivityForResult(intent, requestCode);
} catch (ActivityNotFoundException e) {
return false;
}
mOutstandingIntents.put(requestCode, callback);
mIntentErrors.put(requestCode, mActivity.getString(errorId));
return true;
}
/**
* Displays an error message with a provided error message string.
* @param error The error message string to be displayed.
*/
public void showError(String error) {
if (error != null) {
Toast.makeText(mActivity, error, Toast.LENGTH_SHORT).show();
}
}
/**
* Displays an error message from the given resource id.
* @param resId The error message string's resource id.
*/
public void showError(int resId) {
showError(mActivity.getString(resId));
}
/**
* Displays an error message for a nonexistent callback.
* @param error The error message string to be displayed.
*/
protected void showCallbackNonExistentError(String error) {
showError(error);
}
/**
* Broadcasts the given intent to all interested BroadcastReceivers.
*/
public void sendBroadcast(Intent intent) {
mActivity.sendBroadcast(intent);
}
/**
* TODO(nileshagrawal): Stop returning Activity Context crbug.com/233440.
* @return Activity context.
* @see #getApplicationContext()
*/
@Deprecated
public Context getContext() {
return mActivity;
}
/**
* @return The application context for this activity.
*/
public Context getApplicationContext() {
return mApplicationContext;
}
/**
* Saves the error messages that should be shown if any pending intents would return
* after the application has been put onPause.
* @param bundle The bundle to save the information in onPause
*/
public void saveInstanceState(Bundle bundle) {
bundle.putSerializable(WINDOW_CALLBACK_ERRORS, mIntentErrors);
}
/**
* Restores the error messages that should be shown if any pending intents would return
* after the application has been put onPause.
* @param bundle The bundle to restore the information from onResume
*/
public void restoreInstanceState(Bundle bundle) {
if (bundle == null) return;
Object errors = bundle.getSerializable(WINDOW_CALLBACK_ERRORS);
if (errors instanceof HashMap) {
@SuppressWarnings("unchecked")
HashMap<Integer, String> intentErrors = (HashMap<Integer, String>) errors;
mIntentErrors = intentErrors;
}
}
/**
* Responds to the intent result if the intent was created by the native window.
* @param requestCode Request code of the requested intent.
* @param resultCode Result code of the requested intent.
* @param data The data returned by the intent.
* @return Boolean value of whether the intent was started by the native window.
*/
public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
IntentCallback callback = mOutstandingIntents.get(requestCode);
mOutstandingIntents.delete(requestCode);
String errorMessage = mIntentErrors.remove(requestCode);
if (callback != null) {
callback.onIntentCompleted(this, resultCode,
mActivity.getContentResolver(), data);
return true;
} else {
if (errorMessage != null) {
showCallbackNonExistentError(errorMessage);
return true;
}
}
return false;
}
/**
* An interface that intent callback objects have to implement.
*/
public interface IntentCallback {
/**
* Handles the data returned by the requested intent.
* @param window A window reference.
* @param resultCode Result code of the requested intent.
* @param contentResolver An instance of ContentResolver class for accessing returned data.
* @param data The data returned by the intent.
*/
public void onIntentCompleted(WindowAndroid window, int resultCode,
ContentResolver contentResolver, Intent data);
}
/**
* Destroys the c++ WindowAndroid object if one has been created.
*/
public void destroy() {
if (mNativeWindowAndroid != 0) {
nativeDestroy(mNativeWindowAndroid);
mNativeWindowAndroid = 0;
}
}
/**
* Returns a pointer to the c++ AndroidWindow object and calls the initializer if
* the object has not been previously initialized.
* @return A pointer to the c++ AndroidWindow.
*/
public int getNativePointer() {
if (mNativeWindowAndroid == 0) {
mNativeWindowAndroid = nativeInit();
}
return mNativeWindowAndroid;
}
/**
* Returns a PNG-encoded screenshot of the the window region at (|windowX|,
* |windowY|) with the size |width| by |height| pixels.
*/
@CalledByNative
public byte[] grabSnapshot(int windowX, int windowY, int width, int height) {
try {
// Take a screenshot of the content view. This generally includes UI
// controls such as the URL bar.
View contentView = mActivity.findViewById(android.R.id.content);
if (contentView == null) return null;
Bitmap bitmap =
UiUtils.generateScaledScreenshot(contentView, 0, Bitmap.Config.ARGB_8888);
if (bitmap == null) return null;
// Clip the result into the requested region.
if (windowX > 0 || windowY > 0 || width != bitmap.getWidth() ||
height != bitmap.getHeight()) {
Rect clip = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
clip.intersect(windowX, windowY, windowX + width, windowY + height);
bitmap = Bitmap.createBitmap(
bitmap, clip.left, clip.top, clip.width(), clip.height());
}
// Compress the result into a PNG.
ByteArrayOutputStream result = new ByteArrayOutputStream();
if (!bitmap.compress(Bitmap.CompressFormat.PNG, 100, result)) return null;
bitmap.recycle();
return result.toByteArray();
} catch (OutOfMemoryError e) {
Log.e(TAG, "Out of memory while grabbing window snapshot.", e);
return null;
}
}
private native int nativeInit();
private native void nativeDestroy(int nativeWindowAndroid);
}