// Copyright (c) 2006-2008 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.

#ifndef WEBKIT_GLUE_WEBFRAME_H_
#define WEBKIT_GLUE_WEBFRAME_H_

#include "base/scoped_ptr.h"
#include "googleurl/src/gurl.h"
#include "skia/ext/bitmap_platform_device.h"
#include "skia/ext/platform_canvas.h"
#include "webkit/glue/console_message_level.h"
#include "webkit/glue/feed.h"
#include "webkit/glue/find_in_page_request.h"
#include "webkit/glue/webscriptsource.h"

class PlatformContextSkia;
class WebDataSource;
class WebError;
class WebRequest;
class WebView;
class WebTextInput;
struct NPObject;

namespace gfx {
class Rect;
class Size;
}

// Every frame in a web page is represented by one WebFrame, including the
// outermost frame.
class WebFrame {
 public:
  WebFrame() {}

  // Binds a C++ class to a JavaScript property of the window object.  This
  // should generally be used via CppBoundClass::BindToJavascript() instead of
  // calling it directly.
  virtual void BindToWindowObject(const std::wstring& name,
                                  NPObject* object) = 0;

  virtual void CallJSGC() = 0;

  // WARNING: DON'T USE THIS METHOD unless you know what it is doing.
  //
  // Returns a pointer to the underlying implementation WebCore::Frame.
  // Currently it is a hack to avoid including "Frame.h". The caller
  // casts the return value to WebCore::Frame.
  // TODO(fqian): Remove this method when V8 supports NP runtime.
  virtual void* GetFrameImplementation() = 0;

  virtual NPObject* GetWindowNPObject() = 0;

  // Loads the given WebRequest.
  virtual void LoadRequest(WebRequest* request) = 0;

  // This method is short-hand for calling LoadAlternateHTMLString with a dummy
  // request for the given base_url.
  virtual void LoadHTMLString(const std::string& html_text,
                              const GURL& base_url) = 0;

  // Loads alternative HTML text in place of a particular URL. This method is
  // designed with error pages in mind, in which case it would typically be
  // called in response to WebViewDelegate's didFailProvisionalLoadWithError
  // method.
  //
  // |html_text| is a utf8 string to load in the frame.  |display_url| is the
  // URL that the content will appear to have been loaded from.  The |replace|
  // parameter controls how this affects session history.  If |replace| is
  // true, then the current session history entry is replaced with the given
  // HTML text.  Otherwise, a new navigation is produced.
  //
  // In either case, when the corresponding session history entry is revisited,
  // it is the given request /w the |display_url| substituted for the request's
  // URL, which is repeated.  The |html_text| is not stored in session history.
  //
  virtual void LoadAlternateHTMLString(const WebRequest* request,
                                       const std::string& html_text,
                                       const GURL& display_url,
                                       bool replace) = 0;

  // Asks the WebFrame to try and download the alternate error page.  We notify
  // the WebViewDelegate of the results so it can decide whether or not to show
  // something to the user (e.g., a local error page or the alternate error
  // page).
  virtual void LoadAlternateHTMLErrorPage(const WebRequest* request,
                                          const WebError& error,
                                          const GURL& error_page_url,
                                          bool replace,
                                          const GURL& fake_url) = 0;

  // Executes JavaScript in the web frame.
  virtual void ExecuteScript(const webkit_glue::WebScriptSource& source) = 0;

  // Executes JavaScript in a new context associated with the web frame. The
  // script gets its own global scope and its own prototypes for intrinsic
  // JavaScript objects (String, Array, and so-on). It shares the wrappers for
  // all DOM nodes and DOM constructors.
  virtual void ExecuteScriptInNewContext(
      const webkit_glue::WebScriptSource* sources, int num_sources) = 0;

  // Returns a string representing the state of the previous page load for
  // later use when loading. The previous page is the page that was loaded
  // before DidCommitLoadForFrame was received.
  //
  // Returns false if there is no valid state to return (for example, there is
  // no previous item). Returns true if the previous item's state was retrieved,
  // even if that state may be empty.
  virtual bool GetPreviousHistoryState(std::string* history_state) const = 0;

  // Returns a string representing the state of the current page load for later
  // use when loading as well as the url and title of the page.
  //
  // Returns false if there is no valid state to return (for example, there is
  // no previous item). Returns true if the current item's state was retrieved,
  // even if that state may be empty.
  virtual bool GetCurrentHistoryState(std::string* history_state) const = 0;

  // Returns true if there is a current history item.  A newly created WebFrame
  // lacks a history item.  Otherwise, this will always be true.
  virtual bool HasCurrentHistoryState() const = 0;

  // Returns the current URL of the frame, or an empty GURL if there is no
  // URL to retrieve (for example, the frame may never have had any content).
  virtual GURL GetURL() const = 0;

  // Returns the URL to the favorite icon for the frame. An empty GURL is
  // returned if the frame has not finished loading, or the frame's URL
  // protocol is not http or https.
  virtual GURL GetFavIconURL() const = 0;

  // Returns the URL to the OpenSearch description document for the frame. If
  // the page does not have a valid document, an empty GURL is returned.
  virtual GURL GetOSDDURL() const = 0;

  // Return the list of feeds specified in the document for the frame. If
  // the page does not have a valid document, an empty list is returned.
  virtual scoped_refptr<class FeedList> GetFeedList() const = 0;

  // Returns the committed data source, which is the last data source that has
  // successfully started loading. Will return NULL if no provisional data
  // has been committed.
  virtual WebDataSource* GetDataSource() const = 0;

  // Returns the provisional data source, which is a data source where a
  // request has been made, but we are not sure if we will use data from it
  // (for example, it may be an invalid URL). When the provisional load is
  // "committed," it will become the "real" data source (see GetDataSource
  // above) and the provisional data source will be NULL.
  virtual WebDataSource* GetProvisionalDataSource() const = 0;

  //
  //  @method stopLoading
  //  @discussion Stop any pending loads on the frame's data source,
  //  and its children.
  //  - (void)stopLoading;
  virtual void StopLoading() = 0;

  // Returns the frame that opened this frame, or NULL if this window has no
  // opener.
  virtual WebFrame* GetOpener() const = 0;

  // Returns the frame containing this frame, or NULL of this is a top level
  // frame with no parent.
  virtual WebFrame* GetParent() const = 0;

  // Returns the child frame with the given xpath.
  // The document of this frame is used as the context node.
  // The xpath may need a recursive traversal if non-trivial
  // A non-trivial xpath will contain a combination of xpaths
  // (delimited by '\n') leading to an inner subframe.
  //
  // Example: /html/body/iframe/\n/html/body/div/iframe/\n/frameset/frame[0]
  // can be broken into 3 xpaths
  // /html/body/iframe evaluates to an iframe within the root frame
  // /html/body/div/iframe evaluates to an iframe within the level-1 iframe
  // /frameset/frame[0] evaluates to first frame within the level-2 iframe
  virtual WebFrame* GetChildFrame(const std::wstring& xpath) const = 0;

  // Returns a pointer to the WebView that contains this WebFrame.  This
  // pointer is not AddRef'd and is only valid for the lifetime of the WebFrame
  // unless it is AddRef'd separately by the caller.
  virtual WebView* GetView() const = 0;

  // Fills the contents of this frame into the given string. If the text is
  // longer than max_chars, it will be clipped to that length. Warning: this
  // function may be slow depending on the number of characters retrieved and
  // page complexity. For a typically sized page, expect it to take on the
  // order of milliseconds.
  //
  // If there is room, subframe text will be recursively appended. Each frame
  // will be separated by an empty line.
  virtual void GetContentAsPlainText(int max_chars,
                                     std::wstring* text) const = 0;

  // Searches a frame for a given string.
  //
  // If a match is found, this function will select it (scrolling down to make
  // it visible if needed) and fill in the IntRect (selection_rect) with the
  // location of where the match was found (in screen coordinates).
  //
  // If no match is found, this function clears all tickmarks and highlighting.
  //
  // Returns true if the search string was found, false otherwise.
  virtual bool Find(const FindInPageRequest& request,
                    bool wrap_within_frame,
                    gfx::Rect* selection_rect) = 0;

  // Notifies the frame that we are no longer interested in searching. This will
  // abort any asynchronous scoping effort already under way (see the function
  // ScopeStringMatches for details) and erase all tick-marks and highlighting
  // from the previous search. If |clear_selection| is true, it will also make
  // sure the end state for the Find operation does not leave a selection.
  // This can occur when the user clears the search string but does not close
  // the find box.
  virtual void StopFinding(bool clear_selection) = 0;

  // Counts how many times a particular string occurs within the frame. It
  // also retrieves the location of the string and updates a vector in the frame
  // so that tick-marks and highlighting can be drawn. This function does its
  // work asynchronously, by running for a certain time-slice and then
  // scheduling itself (co-operative multitasking) to be invoked later
  // (repeating the process until all matches have been found). This allows
  // multiple frames to be searched at the same time and provides a way to
  // cancel at any time (see CancelPendingScopingEffort). The parameter Request
  // specifies what to look for and Reset signals whether this is a brand new
  // request or a continuation of the last scoping effort.
  virtual void ScopeStringMatches(FindInPageRequest request,
                                  bool reset) = 0;

  // Cancels any outstanding requests for scoping string matches on a frame.
  virtual void CancelPendingScopingEffort() = 0;

  // This function is called on the mainframe during the scoping effort to keep
  // a running tally of the accumulated total match-count for all frames. After
  // updating the count it will notify the render-view about the new count.
  virtual void IncreaseMatchCount(int count, int request_id) = 0;

  // Notifies the webview-delegate about a new selection rect. This will result
  // in the browser getting notified. For more information see WebViewDelegate.
  virtual void ReportFindInPageSelection(const gfx::Rect& selection_rect,
                                         int active_match_ordinal,
                                         int request_id) = 0;

  // This function is called on the mainframe to reset the total number of
  // matches found during the scoping effort.
  virtual void ResetMatchCount() = 0;

  // Returns true if the frame is visible (defined as width > 0 and height > 0).
  virtual bool Visible() = 0;

  // Selects all the text in the frame.
  virtual void SelectAll() = 0;

  //
  //  - (void)copy:(id)sender;
  virtual void Copy() = 0;

  //
  //  - (void)cut:(id)sender;
  virtual void Cut() = 0;

  //
  //  - (void)paste:(id)sender;
  virtual void Paste() = 0;

  // Replace the selection text by a given text.
  virtual void Replace(const std::wstring& text) = 0;

  // Toggle spell check on and off.
  virtual void ToggleSpellCheck() = 0;

  // Return whether spell check is enabled or not in this frame.
  virtual bool SpellCheckEnabled() = 0;

  //
  //  - (void)delete:(id)sender;
  // Delete as in similar to Cut, not as in teardown
  virtual void Delete() = 0;

  // Undo the last text editing command.
  virtual void Undo() = 0;

  // Redo the last undone text editing command.
  virtual void Redo() = 0;

  // Clear any text selection in the frame.
  virtual void ClearSelection() = 0;

  // Returns the selected text if there is any.  If |as_html| is true, returns
  // the selection as HTML.  The return value is encoded in utf-8.
  virtual std::string GetSelection(bool as_html) = 0;

  // Paints the contents of this web view in a bitmapped image. This image
  // will not have plugins drawn. Devices are cheap to copy because the data is
  // internally refcounted so we allocate and return a new copy
  //
  // Set scroll_to_zero to force all frames to be scrolled to 0,0 before
  // being painted into the image. This will not send DOM events because it
  // just draws the contents at a different place, but it does mean the
  // scrollbars in the resulting image will appear to be wrong (they'll be
  // painted as if the content was scrolled).
  //
  // Returns false on failure. CaptureImage can fail if 'image' argument
  // is not valid or due to failure to allocate a canvas.
  virtual bool CaptureImage(scoped_ptr<skia::BitmapPlatformDevice>* image,
                            bool scroll_to_zero) = 0;

  // This function sets a flag within WebKit to instruct it to render the page
  // as View-Source (showing the HTML source for the page).
  virtual void SetInViewSourceMode(bool enable) = 0;

  // This function returns whether this frame is in "view-source" mode.
  virtual bool GetInViewSourceMode() const = 0;

  // Returns the frame name.
  virtual std::wstring GetName() = 0;

  // Returns a pointer to the WebTextInput object associated with the frame.
  // The caller does not own the object returned.
  virtual WebTextInput* GetTextInput() = 0;

  // Executes a webkit editor command. The supported commands are a
  // superset of those accepted by javascript:document.execCommand().
  // This method is exposed in order to implement
  // javascript:layoutTestController.execCommand()
  virtual bool ExecuteCoreCommandByName(const std::string& name,
                                        const std::string& value) = 0;

  // Checks whether a webkit editor command is currently enabled. This
  // method is exposed in order to implement
  // javascript:layoutTestController.isCommandEnabled()
  virtual bool IsCoreCommandEnabled(const std::string& name) = 0;

  // Adds a message to the frame's console.
  virtual void AddMessageToConsole(const std::wstring& msg,
                                   ConsoleMessageLevel level) = 0;

  // Tells the current page to close, running the onunload handler.
  // TODO(creis): We'd rather use WebView::Close(), but that sets its delegate_
  // to NULL, preventing any JavaScript dialogs in the onunload handler from
  // appearing.  This lets us shortcut that for now, but we should refactor
  // close messages so that this isn't necessary.
  virtual void ClosePage() = 0;

  // The current scroll offset from the top of frame in pixels.
  virtual gfx::Size ScrollOffset() const = 0;

  // Reformats the web page, i.e. the main frame and its subframes, for printing
  // or for screen display, depending on |printing| argument. |page_width_min|
  // and |page_width_max| are the minimum and maximum width, in pixels, that the
  // layout can try to fit the whole content. |width| is the resulted choosen
  // document width in pixel.
  // Note: It fails if the main frame failed to load. It will succeed even if a
  // child frame failed to load.
  virtual bool SetPrintingMode(bool printing,
                               float page_width_min,
                               float page_width_max,
                               int* width) = 0;

  // Layouts the web page on paper. Calculates the rectangle of the web page
  // each pages will "see". Then you can retrieve the exact view of a paper page
  // with GetPageRect.
  // Returns the number of printed pages computed.
  virtual int ComputePageRects(const gfx::Size& page_size_px) = 0;

  // Retrieves the paper page's view of the web page.
  virtual void GetPageRect(int page, gfx::Rect* page_size) const = 0;

  // Prints one page. |page| is 0-based.
  virtual bool SpoolPage(int page, skia::PlatformCanvas* canvas) = 0;

  // Only for test_shell
  virtual int PendingFrameUnloadEventCount() const = 0;

 protected:
  virtual ~WebFrame() {}

 private:
  DISALLOW_COPY_AND_ASSIGN(WebFrame);
};

#endif  // WEBKIT_GLUE_WEBFRAME_H_