/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WebViewClient_h
#define WebViewClient_h

#include "WebDragOperation.h"
#include "WebEditingAction.h"
#include "WebFileChooserCompletion.h"
#include "WebFileChooserParams.h"
#include "WebString.h"
#include "WebTextAffinity.h"
#include "WebTextDirection.h"
#include "WebWidgetClient.h"

namespace WebKit {

class WebAccessibilityObject;
class WebDragData;
class WebFileChooserCompletion;
class WebFrame;
class WebNode;
class WebNotificationPresenter;
class WebRange;
class WebStorageNamespace;
class WebURL;
class WebView;
class WebWidget;
struct WebConsoleMessage;
struct WebContextMenuData;
struct WebPoint;
struct WebPopupMenuInfo;

// Since a WebView is a WebWidget, a WebViewClient is a WebWidgetClient.
// Virtual inheritance allows an implementation of WebWidgetClient to be
// easily reused as part of an implementation of WebViewClient.
class WebViewClient : virtual public WebWidgetClient {
public:
    // Factory methods -----------------------------------------------------

    // Create a new related WebView.  This method must clone its session storage
    // so any subsequent calls to createSessionStorageNamespace conform to the
    // WebStorage specification.
    virtual WebView* createView(WebFrame* creator) { return 0; }

    // Create a new WebPopupMenu.  In the second form, the client is
    // responsible for rendering the contents of the popup menu.
    virtual WebWidget* createPopupMenu(bool activatable) { return 0; }
    virtual WebWidget* createPopupMenu(const WebPopupMenuInfo&) { return 0; }

    // Create a session storage namespace object associated with this WebView.
    virtual WebStorageNamespace* createSessionStorageNamespace() { return 0; }

    // Misc ----------------------------------------------------------------

    // A new message was added to the console.
    virtual void didAddMessageToConsole(
        const WebConsoleMessage&, const WebString& sourceName, unsigned sourceLine) { }

    // Called when script in the page calls window.print().  If frame is
    // non-null, then it selects a particular frame, including its
    // children, to print.  Otherwise, the main frame and its children
    // should be printed.
    virtual void printPage(WebFrame*) { }

    // Called to retrieve the provider of desktop notifications.
    virtual WebNotificationPresenter* notificationPresenter() { return 0; }


    // Navigational --------------------------------------------------------

    // These notifications bracket any loading that occurs in the WebView.
    virtual void didStartLoading() { }
    virtual void didStopLoading() { }


    // Editing -------------------------------------------------------------

    // These methods allow the client to intercept and overrule editing
    // operations.
    virtual bool shouldBeginEditing(const WebRange&) { return true; }
    virtual bool shouldEndEditing(const WebRange&) { return true; }
    virtual bool shouldInsertNode(
        const WebNode&, const WebRange&, WebEditingAction) { return true; }
    virtual bool shouldInsertText(
        const WebString&, const WebRange&, WebEditingAction) { return true; }
    virtual bool shouldChangeSelectedRange(
        const WebRange& from, const WebRange& to, WebTextAffinity,
        bool stillSelecting) { return true; }
    virtual bool shouldDeleteRange(const WebRange&) { return true; }
    virtual bool shouldApplyStyle(const WebString& style, const WebRange&) { return true; }

    virtual bool isSmartInsertDeleteEnabled() { return true; }
    virtual bool isSelectTrailingWhitespaceEnabled() { return true; }
    virtual void setInputMethodEnabled(bool enabled) { }

    virtual void didBeginEditing() { }
    virtual void didChangeSelection(bool isSelectionEmpty) { }
    virtual void didChangeContents() { }
    virtual void didExecuteCommand(const WebString& commandName) { }
    virtual void didEndEditing() { }

    // This method is called in response to WebView's handleInputEvent()
    // when the default action for the current keyboard event is not
    // suppressed by the page, to give the embedder a chance to handle
    // the keyboard event specially.
    //
    // Returns true if the keyboard event was handled by the embedder,
    // indicating that the default action should be suppressed.
    virtual bool handleCurrentKeyboardEvent() { return false; }


    // Spellchecker --------------------------------------------------------

    // The client should perform spell-checking on the given text.  If the
    // text contains a misspelled word, then upon return misspelledOffset
    // will point to the start of the misspelled word, and misspelledLength
    // will indicates its length.  Otherwise, if there was not a spelling
    // error, then upon return misspelledLength is 0.
    virtual void spellCheck(
        const WebString& text, int& misspelledOffset, int& misspelledLength) { }

    // Computes an auto-corrected replacement for a misspelled word.  If no
    // replacement is found, then an empty string is returned.
    virtual WebString autoCorrectWord(const WebString& misspelledWord) { return WebString(); }

    // Show or hide the spelling UI.
    virtual void showSpellingUI(bool show) { }

    // Returns true if the spelling UI is showing.
    virtual bool isShowingSpellingUI() { return false; }

    // Update the spelling UI with the given word.
    virtual void updateSpellingUIWithMisspelledWord(const WebString& word) { }


    // Dialogs -------------------------------------------------------------

    // This method returns immediately after showing the dialog. When the
    // dialog is closed, it should call the WebFileChooserCompletion to
    // pass the results of the dialog. Returns false if
    // WebFileChooseCompletion will never be called.
    virtual bool runFileChooser(const WebFileChooserParams&,
                                WebFileChooserCompletion*) { return false; }

    // Displays a modal alert dialog containing the given message.  Returns
    // once the user dismisses the dialog.
    virtual void runModalAlertDialog(
        WebFrame*, const WebString& message) { }

    // Displays a modal confirmation dialog with the given message as
    // description and OK/Cancel choices.  Returns true if the user selects
    // 'OK' or false otherwise.
    virtual bool runModalConfirmDialog(
        WebFrame*, const WebString& message) { return false; }

    // Displays a modal input dialog with the given message as description
    // and OK/Cancel choices.  The input field is pre-filled with
    // defaultValue.  Returns true if the user selects 'OK' or false
    // otherwise.  Upon returning true, actualValue contains the value of
    // the input field.
    virtual bool runModalPromptDialog(
        WebFrame*, const WebString& message, const WebString& defaultValue,
        WebString* actualValue) { return false; }

    // Displays a modal confirmation dialog containing the given message as
    // description and OK/Cancel choices, where 'OK' means that it is okay
    // to proceed with closing the view.  Returns true if the user selects
    // 'OK' or false otherwise.
    virtual bool runModalBeforeUnloadDialog(
        WebFrame*, const WebString& message) { return true; }


    // UI ------------------------------------------------------------------

    // Called when script modifies window.status
    virtual void setStatusText(const WebString&) { }

    // Called when hovering over an anchor with the given URL.
    virtual void setMouseOverURL(const WebURL&) { }

    // Called when keyboard focus switches to an anchor with the given URL.
    virtual void setKeyboardFocusURL(const WebURL&) { }

    // Called when a tooltip should be shown at the current cursor position.
    virtual void setToolTipText(const WebString&, WebTextDirection hint) { }

    // Shows a context menu with commands relevant to a specific element on
    // the given frame. Additional context data is supplied.
    virtual void showContextMenu(WebFrame*, const WebContextMenuData&) { }

    // Called when a drag-n-drop operation should begin.
    virtual void startDragging(
        const WebPoint& from, const WebDragData&, WebDragOperationsMask) { }

    // Called to determine if drag-n-drop operations may initiate a page
    // navigation.
    virtual bool acceptsLoadDrops() { return true; }

    // Take focus away from the WebView by focusing an adjacent UI element
    // in the containing window.
    virtual void focusNext() { }
    virtual void focusPrevious() { }


    // Session history -----------------------------------------------------

    // Tells the embedder to navigate back or forward in session history by
    // the given offset (relative to the current position in session
    // history).
    virtual void navigateBackForwardSoon(int offset) { }

    // Returns the number of history items before/after the current
    // history item.
    virtual int historyBackListCount() { return 0; }
    virtual int historyForwardListCount() { return 0; }

    // Called to notify the embedder when a new history item is added.
    virtual void didAddHistoryItem() { }


    // Accessibility -------------------------------------------------------

    // Notifies embedder that the focus has changed to the given
    // accessibility object.
    virtual void focusAccessibilityObject(const WebAccessibilityObject&) { }

    // Notifies embedder that the state of an accessibility object has changed.
    virtual void didChangeAccessibilityObjectState(const WebAccessibilityObject&) { }


    // Developer tools -----------------------------------------------------

    // Called to notify the client that the inspector's settings were
    // changed and should be saved.  See WebView::inspectorSettings.
    virtual void didUpdateInspectorSettings() { }


    // Autofill ------------------------------------------------------------

    // Queries the browser for suggestions to be shown for the form text
    // field named |name|.  |value| is the text entered by the user so
    // far and the WebNode corresponds to the input field.
    virtual void queryAutofillSuggestions(const WebNode&,
                                          const WebString& name,
                                          const WebString& value) { }

    // Instructs the browser to remove the autofill entry specified from
    // its DB.
    virtual void removeAutofillSuggestions(const WebString& name,
                                           const WebString& value) { }

protected:
    ~WebViewClient() { }
};

} // namespace WebKit

#endif