include/wx/webview.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        webview.h
   3 // Purpose:     Common interface and events for web view component
   4 // Author:      Marianne Gagnon
   5 // Id:          $Id$
   6 // Copyright:   (c) 2010 Marianne Gagnon, 2011 Steven Lamerton
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _WX_WEB_VIEW_H_
  11 #define _WX_WEB_VIEW_H_
  12
  13 #include "wx/setup.h"
  14
  15 #if wxUSE_WEB
  16
  17 #include "wx/control.h"
  18 #include "wx/event.h"
  19 #include "wx/sstream.h"
  20 #include "wx/sharedptr.h"
  21 #include "wx/vector.h"
  22
  23 #include "wx/osx/webhistoryitem_webkit.h"
  24 #include "wx/gtk/webhistoryitem_webkit.h"
  25 #include "wx/msw/webhistoryitem_ie.h"
  26
  27 class wxFSFile;
  28 class wxFileSystem;
  29
  30
  31 /**
  32  * Zoom level in web view component
  33  */
  34 enum wxWebViewZoom
  35 {
  36     wxWEB_VIEW_ZOOM_TINY,
  37     wxWEB_VIEW_ZOOM_SMALL,
  38     wxWEB_VIEW_ZOOM_MEDIUM,
  39     wxWEB_VIEW_ZOOM_LARGE,
  40     wxWEB_VIEW_ZOOM_LARGEST
  41 };
  42
  43 /**
  44  * The type of zooming that the web view control can perform
  45  */
  46 enum wxWebViewZoomType
  47 {
  48     /** The entire layout scales when zooming, including images */
  49     wxWEB_VIEW_ZOOM_TYPE_LAYOUT,
  50     /** Only the text changes in size when zooming, images and other layout
  51       * elements retain their initial size */
  52     wxWEB_VIEW_ZOOM_TYPE_TEXT
  53 };
  54
  55 /** Types of errors that can cause navigation to fail */
  56 enum wxWebNavigationError
  57 {
  58     /** Connection error (timeout, etc.) */
  59     wxWEB_NAV_ERR_CONNECTION,
  60     /** Invalid certificate */
  61     wxWEB_NAV_ERR_CERTIFICATE,
  62     /** Authentication required */
  63     wxWEB_NAV_ERR_AUTH,
  64     /** Other security error */
  65     wxWEB_NAV_ERR_SECURITY,
  66     /** Requested resource not found */
  67     wxWEB_NAV_ERR_NOT_FOUND,
  68     /** Invalid request/parameters (e.g. bad URL, bad protocol,
  69       * unsupported resource type) */
  70     wxWEB_NAV_ERR_REQUEST,
  71     /** The user cancelled (e.g. in a dialog) */
  72     wxWEB_NAV_ERR_USER_CANCELLED,
  73     /** Another (exotic) type of error that didn't fit in other categories*/
  74     wxWEB_NAV_ERR_OTHER
  75 };
  76
  77 /** Type of refresh */
  78 enum wxWebViewReloadFlags
  79 {
  80     /** Default reload, will access cache */
  81     wxWEB_VIEW_RELOAD_DEFAULT,
  82     /** Reload the current view without accessing the cache */
  83     wxWEB_VIEW_RELOAD_NO_CACHE
  84 };
  85
  86
  87 /**
  88  * List of available backends for wxWebView
  89  */
  90 enum wxWebViewBackend
  91 {
  92     /** Value that may be passed to wxWebView to let it pick an appropriate
  93      * engine for the current platform*/
  94     wxWEB_VIEW_BACKEND_DEFAULT,
  95
  96     /** The WebKit web engine */
  97     wxWEB_VIEW_BACKEND_WEBKIT,
  98
  99     /** Use Microsoft Internet Explorer as web engine */
 100     wxWEB_VIEW_BACKEND_IE
 101 };
 102
 103 //Base class for custom scheme handlers
 104 class WXDLLIMPEXP_WEB wxWebViewHandler
 105 {
 106 public:
 107     wxWebViewHandler(const wxString& scheme) : m_scheme(scheme) {}
 108     virtual wxString GetName() const { return m_scheme; }
 109     virtual wxFSFile* GetFile(const wxString &uri) = 0;
 110 private:
 111     wxString m_scheme;
 112 };
 113
 114 extern WXDLLIMPEXP_DATA_WEB(const char) wxWebViewNameStr[];
 115 extern WXDLLIMPEXP_DATA_WEB(const char) wxWebViewDefaultURLStr[];
 116
 117 class WXDLLIMPEXP_WEB wxWebView : public wxControl
 118 {
 119 public:
 120
 121     /**
 122      *  Creation function for two-step creation.
 123      */
 124     virtual bool Create(wxWindow* parent,
 125            wxWindowID id,
 126            const wxString& url,
 127            const wxPoint& pos,
 128            const wxSize& size,
 129            long style,
 130            const wxString& name) = 0;
 131
 132     /**
 133      * Factory function to create a new wxWebView for two-step creation
 134      * (you need to call wxWebView::Create on the returned object)
 135      * @param backend which web engine to use as backend for wxWebView
 136      * @return the created wxWebView, or NULL if the requested backend is
 137      *         not available
 138      */
 139     static wxWebView* New(wxWebViewBackend backend = wxWEB_VIEW_BACKEND_DEFAULT);
 140
 141     // TODO: clarify what styles can do, or remove this flag
 142     /**
 143      * Factory function to create a new wxWebView
 144      * @param parent parent window to create this view in
 145      * @param id ID of this control
 146      * @param url URL to load by default in the web view
 147      * @param pos position to create this control at
 148      *            (you may use wxDefaultPosition if you use sizers)
 149      * @param size size to create this control with
 150      *             (you may use wxDefaultSize if you use sizers)
 151      * @param backend which web engine to use as backend for wxWebView
 152      * @return the created wxWebView, or NULL if the requested backend
 153      *         is not available
 154      */
 155     static wxWebView* New(wxWindow* parent,
 156            wxWindowID id,
 157            const wxString& url = wxWebViewDefaultURLStr,
 158            const wxPoint& pos = wxDefaultPosition,
 159            const wxSize& size = wxDefaultSize,
 160            wxWebViewBackend backend = wxWEB_VIEW_BACKEND_DEFAULT,
 161            long style = 0,
 162            const wxString& name = wxWebViewNameStr);
 163
 164
 165     /** Get whether it is possible to navigate back in the history of
 166       * visited pages
 167       */
 168     virtual bool CanGoBack() = 0;
 169
 170     /** Get whether it is possible to navigate forward in the history of
 171       * visited pages
 172       */
 173     virtual bool CanGoForward() = 0;
 174
 175     /** Navigate back in the history of visited pages.
 176       * Only valid if CanGoBack() returned true.
 177       */
 178     virtual void GoBack() = 0;
 179
 180     /** Navigate forwardin the history of visited pages.
 181       * Only valid if CanGoForward() returned true.
 182       */
 183     virtual void GoForward() = 0;
 184
 185     /**
 186      * Load a HTMl document (web page) from a URL
 187      * @param url the URL where the HTML document to display can be found
 188      * @note web engines generally report errors asynchronously, so if you wish
 189      *       to know whether loading the URL was successful, register to receive
 190      *       navigation error events
 191      */
 192     virtual void LoadUrl(const wxString& url) = 0;
 193
 194     virtual void ClearHistory() = 0;
 195     virtual void EnableHistory(bool enable = true) = 0;
 196     virtual wxVector<wxSharedPtr<wxWebHistoryItem> > GetBackwardHistory() = 0;
 197     virtual wxVector<wxSharedPtr<wxWebHistoryItem> > GetForwardHistory() = 0;
 198     virtual void LoadHistoryItem(wxSharedPtr<wxWebHistoryItem> item) = 0;
 199
 200     /**
 201      * Stop the current page loading process, if any.
 202      * May trigger an error event of type wxWEB_NAV_ERR_USER_CANCELLED.
 203      * TODO: make wxWEB_NAV_ERR_USER_CANCELLED errors uniform across ports.
 204      */
 205     virtual void Stop() = 0;
 206
 207     /**
 208      * Reload the currently displayed URL.
 209      * @param flags A bit array that may optionnally contain reload options
 210      */
 211     virtual void Reload(wxWebViewReloadFlags flags = wxWEB_VIEW_RELOAD_DEFAULT) = 0;
 212
 213
 214     /**
 215      * Get the URL of the currently displayed document
 216      */
 217     virtual wxString GetCurrentURL() = 0;
 218
 219     /**
 220      * Get the title of the current web page, or its URL/path if title is not
 221      * available
 222      */
 223     virtual wxString GetCurrentTitle() = 0;
 224
 225     // TODO: handle choosing a frame when calling GetPageSource()?
 226     /**
 227      * Get the HTML source code of the currently displayed document
 228      * @return the HTML source code, or an empty string if no page is currently
 229      *         shown
 230      */
 231     virtual wxString GetPageSource() = 0;
 232     virtual wxString GetPageText() = 0;
 233
 234    /**
 235      * Get the zoom factor of the page
 236      * @return How much the HTML document is zoomed (scaleed)
 237      */
 238     virtual wxWebViewZoom GetZoom() = 0;
 239
 240     /**
 241      * Set the zoom factor of the page
 242      * @param zoom How much to zoom (scale) the HTML document
 243      */
 244     virtual void SetZoom(wxWebViewZoom zoom) = 0;
 245
 246     /**
 247      * Set how to interpret the zoom factor
 248      * @param zoomType how the zoom factor should be interpreted by the
 249      *                 HTML engine
 250      * @note invoke    canSetZoomType() first, some HTML renderers may not
 251      *                 support all zoom types
 252      */
 253     virtual void SetZoomType(wxWebViewZoomType zoomType) = 0;
 254
 255     /**
 256      * Get how the zoom factor is currently interpreted
 257      * @return how the zoom factor is currently interpreted by the HTML engine
 258      */
 259     virtual wxWebViewZoomType GetZoomType() const = 0;
 260
 261     /**
 262      * Retrieve whether the current HTML engine supports a type of zoom
 263      * @param type the type of zoom to test
 264      * @return whether this type of zoom is supported by this HTML engine
 265      *         (and thus can be set through setZoomType())
 266      */
 267     virtual bool CanSetZoomType(wxWebViewZoomType type) const = 0;
 268
 269     // TODO: allow 'SetPage' to find files (e.g. images) from a virtual file
 270     // system if possible
 271     /**
 272      * Set the displayed page source to the contents of the given string
 273      * @param html    the string that contains the HTML data to display
 274      * @param baseUrl URL assigned to the HTML data, to be used to resolve
 275      *                relative paths, for instance
 276      */
 277     virtual void SetPage(const wxString& html, const wxString& baseUrl) = 0;
 278
 279     /**
 280      * Set the displayed page source to the contents of the given stream
 281      * @param html    the stream to read HTML data from
 282      * @param baseUrl URL assigned to the HTML data, to be used to resolve
 283      *                relative paths, for instance
 284      */
 285     virtual void SetPage(wxInputStream& html, wxString baseUrl)
 286     {
 287         wxStringOutputStream stream;
 288         stream.Write(html);
 289         SetPage(stream.GetString(), baseUrl);
 290     }
 291
 292     virtual void SetEditable(bool enable = true) = 0;
 293     virtual bool IsEditable() = 0;
 294
 295     virtual void SelectAll() = 0;
 296     virtual bool HasSelection() = 0;
 297     virtual void DeleteSelection() = 0;
 298     virtual wxString GetSelectedText() = 0;
 299     virtual wxString GetSelectedSource() = 0;
 300     virtual void ClearSelection() = 0;
 301
 302     virtual void RunScript(const wxString& javascript) = 0;
 303
 304     // TODO:
 305     //     void EnableJavascript(bool enabled);             // maybe?
 306     //       // maybe?
 307
 308     //     void SetScrollPos(int pos);                      // maybe?
 309     //     int GetScrollPos();                              // maybe?
 310
 311     //     wxString GetStatusText();                        // maybe?
 312     //     void SetStatusText(wxString text);               // maybe?
 313     //     * status text changed event?
 314     //     * title changed event?
 315
 316     //    virtual bool IsOfflineMode() = 0;                 // maybe?
 317     //     virtual void SetOfflineMode(bool offline) = 0;   // maybe?
 318
 319     /**
 320      * Opens a print dialog so that the user may print the currently
 321      * displayed page.
 322      */
 323     virtual void Print() = 0;
 324
 325     /**
 326      * Returns whether the web control is currently busy (e.g. loading a page)
 327      */
 328     virtual bool IsBusy() = 0;
 329
 330     //Clipboard functions
 331     virtual bool CanCut() = 0;
 332     virtual bool CanCopy() = 0;
 333     virtual bool CanPaste() = 0;
 334     virtual void Cut() = 0;
 335     virtual void Copy() = 0;
 336     virtual void Paste() = 0;
 337
 338     //Undo / redo functionality
 339     virtual bool CanUndo() = 0;
 340     virtual bool CanRedo() = 0;
 341     virtual void Undo() = 0;
 342     virtual void Redo() = 0;
 343
 344     //Virtual Filesystem Support
 345     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) = 0;
 346
 347     wxDECLARE_ABSTRACT_CLASS(wxWebView);
 348 };
 349
 350 class WXDLLIMPEXP_WEB wxWebNavigationEvent : public wxCommandEvent
 351 {
 352 public:
 353     wxWebNavigationEvent() {}
 354     wxWebNavigationEvent(wxEventType type, int id, const wxString url,
 355                          const wxString target, bool canVeto)
 356         : wxCommandEvent(type, id)
 357     {
 358         m_url = url;
 359         m_target = target;
 360         m_vetoed = false;
 361         m_canVeto = canVeto;
 362     }
 363
 364     /**
 365      *  Get the URL being visited
 366      */
 367     const wxString& GetURL() const { return m_url; }
 368
 369     /**
 370      * Get the target (frame or window) in which the URL that caused this event
 371      * is viewed, or an empty string if not available.
 372      */
 373     const wxString& GetTarget() const { return m_target; }
 374
 375     // default copy ctor, assignment operator and dtor are ok
 376     virtual wxEvent* Clone() const { return new wxWebNavigationEvent(*this); }
 377
 378     /** Get whether this event may be vetoed (stopped/prevented). Only
 379       *  meaningful for events fired before navigation takes place.
 380       */
 381     bool CanVeto() const { return m_canVeto; }
 382
 383     /** Whether this event was vetoed (stopped/prevented). Only meaningful for
 384      *  events fired before navigation takes place.
 385      */
 386     bool IsVetoed() const { return m_vetoed; }
 387
 388     /** Veto (prevent/stop) this event. Only meaningful for events fired
 389      *  before navigation takes place. Only valid if CanVeto() returned true.
 390      */
 391     void Veto() { wxASSERT(m_canVeto); m_vetoed = true; }
 392
 393 private:
 394     wxString m_url;
 395     wxString m_target;
 396     bool m_canVeto;
 397     bool m_vetoed;
 398
 399     wxDECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxWebNavigationEvent);
 400 };
 401
 402 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NAVIGATING, wxWebNavigationEvent );
 403 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NAVIGATED, wxWebNavigationEvent );
 404 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_LOADED, wxWebNavigationEvent );
 405 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_ERROR, wxWebNavigationEvent );
 406 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NEWWINDOW, wxWebNavigationEvent );
 407 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_TITLE_CHANGED, wxWebNavigationEvent );
 408
 409 typedef void (wxEvtHandler::*wxWebNavigationEventFunction)
 410              (wxWebNavigationEvent&);
 411
 412 #define wxWebNavigationEventHandler(func) \
 413     wxEVENT_HANDLER_CAST(wxWebNavigationEventFunction, func)
 414
 415 #define EVT_WEB_VIEW_NAVIGATING(id, fn) \
 416     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NAVIGATING, id, \
 417                      wxHtmlNavigatingEventHandler(fn))
 418
 419 #define EVT_WEB_VIEW_NAVIGATED(id, fn) \
 420     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NAVIGATED, id, \
 421                      wxHtmlNavigatingEventHandler(fn))
 422
 423 #define EVT_WEB_VIEW_LOADED(id, fn) \
 424     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_LOADED, id, \
 425                      wxHtmlNavigatingEventHandler(fn))
 426
 427 #define EVT_WEB_VIEW_ERRROR(id, fn) \
 428     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_ERROR, id, \
 429                      wxHtmlNavigatingEventHandler(fn))
 430
 431 #define EVT_WEB_VIEW_NEWWINDOW(id, fn) \
 432     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NEWWINDOW, id, \
 433                      wxHtmlNavigatingEventHandler(fn))
 434
 435 #define EVT_WEB_VIEW_TITLE_CHANGED(id, fn) \
 436     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_TITLE_CHANGED, id, \
 437                      wxHtmlNavigatingEventHandler(fn))
 438
 439 #endif // wxUSE_WEB
 440
 441 #endif // _WX_WEB_VIEW_H_