/*
* Copyright (C) 2008 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.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Message;
import android.view.View;
public class WebChromeClient {
/**
* Tell the host application the current progress of loading a page.
* @param view The WebView that initiated the callback.
* @param newProgress Current page loading progress, represented by
* an integer between 0 and 100.
*/
public void onProgressChanged(WebView view, int newProgress) {}
/**
* Notify the host application of a change in the document title.
* @param view The WebView that initiated the callback.
* @param title A String containing the new title of the document.
*/
public void onReceivedTitle(WebView view, String title) {}
/**
* Notify the host application of a new favicon for the current page.
* @param view The WebView that initiated the callback.
* @param icon A Bitmap containing the favicon for the current page.
*/
public void onReceivedIcon(WebView view, Bitmap icon) {}
/**
* Notify the host application of the url for an apple-touch-icon.
* @param view The WebView that initiated the callback.
* @param url The icon url.
* @param precomposed True if the url is for a precomposed touch icon.
*/
public void onReceivedTouchIconUrl(WebView view, String url,
boolean precomposed) {}
/**
* A callback interface used by the host application to notify
* the current page that its custom view has been dismissed.
*/
public interface CustomViewCallback {
/**
* Invoked when the host application dismisses the
* custom view.
*/
public void onCustomViewHidden();
}
/**
* Notify the host application that the current page would
* like to show a custom View. This is used for Fullscreen
* video playback; see "HTML5 Video support" documentation on
* {@link WebView}.
* @param view is the View object to be shown.
* @param callback is the callback to be invoked if and when the view
* is dismissed.
*/
public void onShowCustomView(View view, CustomViewCallback callback) {};
/**
* Notify the host application that the current page would
* like to show a custom View in a particular orientation.
* @param view is the View object to be shown.
* @param requestedOrientation An orientation constant as used in
* {@link ActivityInfo#screenOrientation ActivityInfo.screenOrientation}.
* @param callback is the callback to be invoked if and when the view
* is dismissed.
* @deprecated This method supports the obsolete plugin mechanism,
* and will not be invoked in future
*/
@Deprecated
public void onShowCustomView(View view, int requestedOrientation,
CustomViewCallback callback) {};
/**
* Notify the host application that the current page would
* like to hide its custom view.
*/
public void onHideCustomView() {}
/**
* Request the host application to create a new window. If the host
* application chooses to honor this request, it should return true from
* this method, create a new WebView to host the window, insert it into the
* View system and send the supplied resultMsg message to its target with
* the new WebView as an argument. If the host application chooses not to
* honor the request, it should return false from this method. The default
* implementation of this method does nothing and hence returns false.
* @param view The WebView from which the request for a new window
* originated.
* @param isDialog True if the new window should be a dialog, rather than
* a full-size window.
* @param isUserGesture True if the request was initiated by a user gesture,
* such as the user clicking a link.
* @param resultMsg The message to send when once a new WebView has been
* created. resultMsg.obj is a
* {@link WebView.WebViewTransport} object. This should be
* used to transport the new WebView, by calling
* {@link WebView.WebViewTransport#setWebView(WebView)
* WebView.WebViewTransport.setWebView(WebView)}.
* @return This method should return true if the host application will
* create a new window, in which case resultMsg should be sent to
* its target. Otherwise, this method should return false. Returning
* false from this method but also sending resultMsg will result in
* undefined behavior.
*/
public boolean onCreateWindow(WebView view, boolean isDialog,
boolean isUserGesture, Message resultMsg) {
return false;
}
/**
* Request display and focus for this WebView. This may happen due to
* another WebView opening a link in this WebView and requesting that this
* WebView be displayed.
* @param view The WebView that needs to be focused.
*/
public void onRequestFocus(WebView view) {}
/**
* Notify the host application to close the given WebView and remove it
* from the view system if necessary. At this point, WebCore has stopped
* any loading in this window and has removed any cross-scripting ability
* in javascript.
* @param window The WebView that needs to be closed.
*/
public void onCloseWindow(WebView window) {}
/**
* Tell the client to display a javascript alert dialog. If the client
* returns true, WebView will assume that the client will handle the
* dialog. If the client returns false, it will continue execution.
* @param view The WebView that initiated the callback.
* @param url The url of the page requesting the dialog.
* @param message Message to be displayed in the window.
* @param result A JsResult to confirm that the user hit enter.
* @return boolean Whether the client will handle the alert dialog.
*/
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
return false;
}
/**
* Tell the client to display a confirm dialog to the user. If the client
* returns true, WebView will assume that the client will handle the
* confirm dialog and call the appropriate JsResult method. If the
* client returns false, a default value of false will be returned to
* javascript. The default behavior is to return false.
* @param view The WebView that initiated the callback.
* @param url The url of the page requesting the dialog.
* @param message Message to be displayed in the window.
* @param result A JsResult used to send the user's response to
* javascript.
* @return boolean Whether the client will handle the confirm dialog.
*/
public boolean onJsConfirm(WebView view, String url, String message,
JsResult result) {
return false;
}
/**
* Tell the client to display a prompt dialog to the user. If the client
* returns true, WebView will assume that the client will handle the
* prompt dialog and call the appropriate JsPromptResult method. If the
* client returns false, a default value of false will be returned to to
* javascript. The default behavior is to return false.
* @param view The WebView that initiated the callback.
* @param url The url of the page requesting the dialog.
* @param message Message to be displayed in the window.
* @param defaultValue The default value displayed in the prompt dialog.
* @param result A JsPromptResult used to send the user's reponse to
* javascript.
* @return boolean Whether the client will handle the prompt dialog.
*/
public boolean onJsPrompt(WebView view, String url, String message,
String defaultValue, JsPromptResult result) {
return false;
}
/**
* Tell the client to display a dialog to confirm navigation away from the
* current page. This is the result of the onbeforeunload javascript event.
* If the client returns true, WebView will assume that the client will
* handle the confirm dialog and call the appropriate JsResult method. If
* the client returns false, a default value of true will be returned to
* javascript to accept navigation away from the current page. The default
* behavior is to return false. Setting the JsResult to true will navigate
* away from the current page, false will cancel the navigation.
* @param view The WebView that initiated the callback.
* @param url The url of the page requesting the dialog.
* @param message Message to be displayed in the window.
* @param result A JsResult used to send the user's response to
* javascript.
* @return boolean Whether the client will handle the confirm dialog.
*/
public boolean onJsBeforeUnload(WebView view, String url, String message,
JsResult result) {
return false;
}
/**
* Tell the client that the quota has been exceeded for the Web SQL Database
* API for a particular origin and request a new quota. The client must
* respond by invoking the
* {@link WebStorage.QuotaUpdater#updateQuota(long) updateQuota(long)}
* method of the supplied {@link WebStorage.QuotaUpdater} instance. The
* minimum value that can be set for the new quota is the current quota. The
* default implementation responds with the current quota, so the quota will
* not be increased.
* @param url The URL of the page that triggered the notification
* @param databaseIdentifier The identifier of the database where the quota
* was exceeded.
* @param quota The quota for the origin, in bytes
* @param estimatedDatabaseSize The estimated size of the offending
* database, in bytes
* @param totalQuota The total quota for all origins, in bytes
* @param quotaUpdater An instance of {@link WebStorage.QuotaUpdater} which
* must be used to inform the WebView of the new quota.
*/
// Note that the callback must always be executed at some point to ensure
// that the sleeping WebCore thread is woken up.
public void onExceededDatabaseQuota(String url, String databaseIdentifier,
long quota, long estimatedDatabaseSize, long totalQuota,
WebStorage.QuotaUpdater quotaUpdater) {
// This default implementation passes the current quota back to WebCore.
// WebCore will interpret this that new quota was declined.
quotaUpdater.updateQuota(quota);
}
/**
* Notify the host application that the Application Cache has reached the
* maximum size. The client must respond by invoking the
* {@link WebStorage.QuotaUpdater#updateQuota(long) updateQuota(long)}
* method of the supplied {@link WebStorage.QuotaUpdater} instance. The
* minimum value that can be set for the new quota is the current quota. The
* default implementation responds with the current quota, so the quota will
* not be increased.
* @param requiredStorage The amount of storage required by the Application
* Cache operation that triggered this notification,
* in bytes.
* @param quota the current maximum Application Cache size, in bytes
* @param quotaUpdater An instance of {@link WebStorage.QuotaUpdater} which
* must be used to inform the WebView of the new quota.
*/
// Note that the callback must always be executed at some point to ensure
// that the sleeping WebCore thread is woken up.
public void onReachedMaxAppCacheSize(long requiredStorage, long quota,
WebStorage.QuotaUpdater quotaUpdater) {
quotaUpdater.updateQuota(quota);
}
/**
* Notify the host application that web content from the specified origin
* is attempting to use the Geolocation API, but no permission state is
* currently set for that origin. The host application should invoke the
* specified callback with the desired permission state. See
* {@link GeolocationPermissions} for details.
* @param origin The origin of the web content attempting to use the
* Geolocation API.
* @param callback The callback to use to set the permission state for the
* origin.
*/
public void onGeolocationPermissionsShowPrompt(String origin,
GeolocationPermissions.Callback callback) {}
/**
* Notify the host application that a request for Geolocation permissions,
* made with a previous call to
* {@link #onGeolocationPermissionsShowPrompt(String,GeolocationPermissions.Callback) onGeolocationPermissionsShowPrompt()}
* has been canceled. Any related UI should therefore be hidden.
*/
public void onGeolocationPermissionsHidePrompt() {}
/**
* Tell the client that a JavaScript execution timeout has occured. And the
* client may decide whether or not to interrupt the execution. If the
* client returns true, the JavaScript will be interrupted. If the client
* returns false, the execution will continue. Note that in the case of
* continuing execution, the timeout counter will be reset, and the callback
* will continue to occur if the script does not finish at the next check
* point.
* @return boolean Whether the JavaScript execution should be interrupted.
* @deprecated This method is no longer supported and will not be invoked.
*/
// This method was only called when using the JSC javascript engine. V8 became
// the default JS engine with Froyo and support for building with JSC was
// removed in b/5495373. V8 does not have a mechanism for making a callback such
// as this.
public boolean onJsTimeout() {
return true;
}
/**
* Report a JavaScript error message to the host application. The ChromeClient
* should override this to process the log message as they see fit.
* @param message The error message to report.
* @param lineNumber The line number of the error.
* @param sourceID The name of the source file that caused the error.
* @deprecated Use {@link #onConsoleMessage(ConsoleMessage) onConsoleMessage(ConsoleMessage)}
* instead.
*/
@Deprecated
public void onConsoleMessage(String message, int lineNumber, String sourceID) { }
/**
* Report a JavaScript console message to the host application. The ChromeClient
* should override this to process the log message as they see fit.
* @param consoleMessage Object containing details of the console message.
* @return true if the message is handled by the client.
*/
public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
// Call the old version of this function for backwards compatability.
onConsoleMessage(consoleMessage.message(), consoleMessage.lineNumber(),
consoleMessage.sourceId());
return false;
}
/**
* When not playing, video elements are represented by a 'poster' image. The
* image to use can be specified by the poster attribute of the video tag in
* HTML. If the attribute is absent, then a default poster will be used. This
* method allows the ChromeClient to provide that default image.
*
* @return Bitmap The image to use as a default poster, or null if no such image is
* available.
*/
public Bitmap getDefaultVideoPoster() {
return null;
}
/**
* When the user starts to playback a video element, it may take time for enough
* data to be buffered before the first frames can be rendered. While this buffering
* is taking place, the ChromeClient can use this function to provide a View to be
* displayed. For example, the ChromeClient could show a spinner animation.
*
* @return View The View to be displayed whilst the video is loading.
*/
public View getVideoLoadingProgressView() {
return null;
}
/** Obtains a list of all visited history items, used for link coloring
*/
public void getVisitedHistory(ValueCallback<String[]> callback) {
}
/**
* Tell the client to open a file chooser.
* @param uploadFile A ValueCallback to set the URI of the file to upload.
* onReceiveValue must be called to wake up the thread.a
* @param acceptType The value of the 'accept' attribute of the input tag
* associated with this file picker.
* @param capture The value of the 'capture' attribute of the input tag
* associated with this file picker.
* @hide
*/
public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType, String capture) {
uploadFile.onReceiveValue(null);
}
/**
* Tell the client that the page being viewed has an autofillable
* form and the user would like to set a profile up.
* @param msg A Message to send once the user has successfully
* set up a profile and to inform the WebTextView it should
* now autofill using that new profile.
* @hide
*/
public void setupAutoFill(Message msg) { }
}