/*
 * 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,
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 * 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 "../platform/WebPageVisibilityState.h"
#include "../platform/WebString.h"
#include "WebAXEnums.h"
#include "WebFrame.h"
#include "WebPopupType.h"
#include "WebTextDirection.h"
#include "WebWidgetClient.h"

namespace blink {

class WebDateTimeChooserCompletion;
class WebFileChooserCompletion;
class WebHitTestResult;
class WebNode;
class WebSpeechRecognizer;
class WebStorageNamespace;
class WebURL;
class WebURLRequest;
class WebView;
class WebWidget;
struct WebDateTimeChooserParams;
struct WebPoint;
struct WebRect;
struct WebSize;
struct WebWindowFeatures;

// 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 : protected 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.
  // The request parameter is only for the client to check if the request
  // could be fulfilled.  The client should not load the request.
  // The policy parameter indicates how the new view will be displayed in
  // WebWidgetClient::show.
  virtual WebView* createView(WebLocalFrame* creator,
                              const WebURLRequest& request,
                              const WebWindowFeatures& features,
                              const WebString& name,
                              WebNavigationPolicy policy,
                              bool suppressOpener) {
    return 0;
  }

  // Create a new popup WebWidget.
  virtual WebWidget* createPopupMenu(WebPopupType) { return 0; }

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

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

  // 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(WebLocalFrame*) {}

  // This method enumerates all the files in the path. It returns immediately
  // and asynchronously invokes the WebFileChooserCompletion with all the
  // files in the directory. Returns false if the WebFileChooserCompletion
  // will never be called.
  virtual bool enumerateChosenDirectory(const WebString& path,
                                        WebFileChooserCompletion*) {
    return false;
  }

  // Called when PageImportanceSignals for the WebView is updated.
  virtual void pageImportanceSignalsChanged() {}

  // Called to get the position of the root window containing the widget
  // in screen coordinates.
  virtual WebRect rootWindowRect() { return WebRect(); }

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

  // These methods allow the client to intercept and overrule editing
  // operations.
  virtual void didChangeContents() {}

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

  // Ask users to choose date/time for the specified parameters. When a user
  // chooses a value, an implementation of this function should call
  // WebDateTimeChooserCompletion::didChooseValue or didCancelChooser. If the
  // implementation opened date/time chooser UI successfully, it should return
  // true. This function is used only if ExternalDateTimeChooser is used.
  virtual bool openDateTimeChooser(const WebDateTimeChooserParams&,
                                   WebDateTimeChooserCompletion*) {
    return false;
  }

  // Show a notification popup for the specified form validation messages
  // besides the anchor rectangle. An implementation of this function should
  // not hide the popup until hideValidationMessage call.
  virtual void showValidationMessage(const WebRect& anchorInViewport,
                                     const WebString& mainText,
                                     WebTextDirection mainTextDir,
                                     const WebString& supplementalText,
                                     WebTextDirection supplementalTextDir) {}

  // Hide notifation popup for form validation messages.
  virtual void hideValidationMessage() {}

  // Move the existing notifation popup to the new anchor position.
  virtual void moveValidationMessage(const WebRect& anchorInViewport) {}

  // 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 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() {}

  // Called when a new node gets focused. |fromNode| is the previously focused
  // node, |toNode| is the newly focused node. Either can be null.
  virtual void focusedNodeChanged(const WebNode& fromNode,
                                  const WebNode& toNode) {}

  // Indicates two things:
  //   1) This view may have a new layout now.
  //   2) Calling layout() is a no-op.
  // After calling WebWidget::layout(), expect to get this notification
  // unless the view did not need a layout.
  virtual void didUpdateLayout() {}

  // Return true to swallow the input event if the embedder will start a
  // disambiguation popup
  virtual bool didTapMultipleTargets(const WebSize& visualViewportOffset,
                                     const WebRect& touchRect,
                                     const WebVector<WebRect>& targetRects) {
    return false;
  }

  // Returns comma separated list of accept languages.
  virtual WebString acceptLanguages() { return WebString(); }

  // Called when the View has changed size as a result of an auto-resize.
  virtual void didAutoResize(const WebSize& newSize) {}

  // Called when the View acquires focus.
  virtual void didFocus() {}

  // TODO(lfg): The callback below is exposed in RenderViewObserver and only
  // used to implement autofill. We should figure out a better way to plumb
  // this.
  // Called immediately after a mousedown event is dispatched due to a mouse
  // press or gesture tap.
  // Note: This is called even when the mouse down event is prevent default.
  virtual void onMouseDown(const WebNode& mouseDownNode) {}

  // 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; }

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

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

  virtual void didUpdateInspectorSetting(const WebString& key,
                                         const WebString& value) {}

  // Speech --------------------------------------------------------------

  // Access the embedder API for speech recognition services.
  virtual WebSpeechRecognizer* speechRecognizer() { return 0; }

  // Zoom ----------------------------------------------------------------

  // Informs the browser that the zoom levels for this frame have changed from
  // the default values.
  virtual void zoomLimitsChanged(double minimumLevel, double maximumLevel) {}

  // Informs the browser that the page scale has changed.
  virtual void pageScaleFactorChanged() {}

  // Content detection ----------------------------------------------------

  // Detects if the content at (or around) provided hit test result
  // corresponds to an intent that could be handed by an embedder
  // (e.g., email addresses, phone numbers).
  virtual WebURL detectContentIntentAt(const WebHitTestResult&) {
    return WebURL();
  }

  // Schedules a new content intent with the provided url.
  // The boolean flag is set to true when the user gesture has been applied
  // to the element from the main frame.
  virtual void scheduleContentIntent(const WebURL&, bool isMainFrame) {}

  // Cancels any previously scheduled content intents that have not yet
  // launched.
  virtual void cancelScheduledContentIntents() {}

  // Draggable regions ----------------------------------------------------

  // Informs the browser that the draggable regions have been updated.
  virtual void draggableRegionsChanged() {}

  // TODO(lfg): These methods are only exposed through WebViewClient while we
  // refactor WebView to not inherit from WebWidget.
  // WebWidgetClient overrides.
  void closeWidgetSoon() override {}
  void convertViewportToWindow(WebRect* rect) override {}
  void convertWindowToViewport(WebFloatRect* rect) override {}
  void didHandleGestureEvent(const WebGestureEvent& event,
                             bool eventCancelled) override {}
  void didOverscroll(const WebFloatSize& overscrollDelta,
                     const WebFloatSize& accumulatedOverscroll,
                     const WebFloatPoint& positionInViewport,
                     const WebFloatSize& velocityInViewport) override {}
  void hasTouchEventHandlers(bool) override {}
  WebLayerTreeView* initializeLayerTreeView() override { return nullptr; }
  void resetInputMethod() override {}
  WebScreenInfo screenInfo() override { return WebScreenInfo(); }
  void setTouchAction(WebTouchAction touchAction) override {}
  void showVirtualKeyboardOnElementFocus() override {}
  void showUnhandledTapUIIfNeeded(const WebPoint& tappedPosition,
                                  const WebNode& tappedNode,
                                  bool pageChanged) override {}
  void show(WebNavigationPolicy) override {}
  virtual WebWidgetClient* widgetClient() { return this; }

 protected:
  ~WebViewClient() {}
};

}  // namespace blink

#endif