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 wxWebHandler
 105 {
 106 public:
 107     virtual wxString GetName() const = 0;
 108     virtual wxFSFile* GetFile(const wxString &uri) = 0;
 109 };
 110
 111 extern WXDLLIMPEXP_DATA_WEB(const char) wxWebViewNameStr[];
 112 extern WXDLLIMPEXP_DATA_WEB(const char) wxWebViewDefaultURLStr[];
 113
 114 class WXDLLIMPEXP_WEB wxWebView : public wxControl
 115 {
 116 public:
 117
 118     /**
 119      *  Creation function for two-step creation.
 120      */
 121     virtual bool Create(wxWindow* parent,
 122            wxWindowID id,
 123            const wxString& url,
 124            const wxPoint& pos,
 125            const wxSize& size,
 126            long style,
 127            const wxString& name) = 0;
 128
 129     /**
 130      * Factory function to create a new wxWebView for two-step creation
 131      * (you need to call wxWebView::Create on the returned object)
 132      * @param backend which web engine to use as backend for wxWebView
 133      * @return the created wxWebView, or NULL if the requested backend is
 134      *         not available
 135      */
 136     static wxWebView* New(wxWebViewBackend backend = wxWEB_VIEW_BACKEND_DEFAULT);
 137
 138     // TODO: clarify what styles can do, or remove this flag
 139     /**
 140      * Factory function to create a new wxWebView
 141      * @param parent parent window to create this view in
 142      * @param id ID of this control
 143      * @param url URL to load by default in the web view
 144      * @param pos position to create this control at
 145      *            (you may use wxDefaultPosition if you use sizers)
 146      * @param size size to create this control with
 147      *             (you may use wxDefaultSize if you use sizers)
 148      * @param backend which web engine to use as backend for wxWebView
 149      * @return the created wxWebView, or NULL if the requested backend
 150      *         is not available
 151      */
 152     static wxWebView* New(wxWindow* parent,
 153            wxWindowID id,
 154            const wxString& url = wxWebViewDefaultURLStr,
 155            const wxPoint& pos = wxDefaultPosition,
 156            const wxSize& size = wxDefaultSize,
 157            wxWebViewBackend backend = wxWEB_VIEW_BACKEND_DEFAULT,
 158            long style = 0,
 159            const wxString& name = wxWebViewNameStr);
 160
 161
 162     /** Get whether it is possible to navigate back in the history of
 163       * visited pages
 164       */
 165     virtual bool CanGoBack() = 0;
 166
 167     /** Get whether it is possible to navigate forward in the history of
 168       * visited pages
 169       */
 170     virtual bool CanGoForward() = 0;
 171
 172     /** Navigate back in the history of visited pages.
 173       * Only valid if CanGoBack() returned true.
 174       */
 175     virtual void GoBack() = 0;
 176
 177     /** Navigate forwardin the history of visited pages.
 178       * Only valid if CanGoForward() returned true.
 179       */
 180     virtual void GoForward() = 0;
 181
 182     /**
 183      * Load a HTMl document (web page) from a URL
 184      * @param url the URL where the HTML document to display can be found
 185      * @note web engines generally report errors asynchronously, so if you wish
 186      *       to know whether loading the URL was successful, register to receive
 187      *       navigation error events
 188      */
 189     virtual void LoadUrl(const wxString& url) = 0;
 190
 191     virtual void ClearHistory() = 0;
 192     virtual void EnableHistory(bool enable = true) = 0;
 193     virtual wxVector<wxSharedPtr<wxWebHistoryItem> > GetBackwardHistory() = 0;
 194     virtual wxVector<wxSharedPtr<wxWebHistoryItem> > GetForwardHistory() = 0;
 195     virtual void LoadHistoryItem(wxSharedPtr<wxWebHistoryItem> item) = 0;
 196
 197     /**
 198      * Stop the current page loading process, if any.
 199      * May trigger an error event of type wxWEB_NAV_ERR_USER_CANCELLED.
 200      * TODO: make wxWEB_NAV_ERR_USER_CANCELLED errors uniform across ports.
 201      */
 202     virtual void Stop() = 0;
 203
 204     /**
 205      * Reload the currently displayed URL.
 206      * @param flags A bit array that may optionnally contain reload options
 207      */
 208     virtual void Reload(wxWebViewReloadFlags flags = wxWEB_VIEW_RELOAD_DEFAULT) = 0;
 209
 210
 211     /**
 212      * Get the URL of the currently displayed document
 213      */
 214     virtual wxString GetCurrentURL() = 0;
 215
 216     /**
 217      * Get the title of the current web page, or its URL/path if title is not
 218      * available
 219      */
 220     virtual wxString GetCurrentTitle() = 0;
 221
 222     // TODO: handle choosing a frame when calling GetPageSource()?
 223     /**
 224      * Get the HTML source code of the currently displayed document
 225      * @return the HTML source code, or an empty string if no page is currently
 226      *         shown
 227      */
 228     virtual wxString GetPageSource() = 0;
 229     virtual wxString GetPageText() = 0;
 230
 231    /**
 232      * Get the zoom factor of the page
 233      * @return How much the HTML document is zoomed (scaleed)
 234      */
 235     virtual wxWebViewZoom GetZoom() = 0;
 236
 237     /**
 238      * Set the zoom factor of the page
 239      * @param zoom How much to zoom (scale) the HTML document
 240      */
 241     virtual void SetZoom(wxWebViewZoom zoom) = 0;
 242
 243     /**
 244      * Set how to interpret the zoom factor
 245      * @param zoomType how the zoom factor should be interpreted by the
 246      *                 HTML engine
 247      * @note invoke    canSetZoomType() first, some HTML renderers may not
 248      *                 support all zoom types
 249      */
 250     virtual void SetZoomType(wxWebViewZoomType zoomType) = 0;
 251
 252     /**
 253      * Get how the zoom factor is currently interpreted
 254      * @return how the zoom factor is currently interpreted by the HTML engine
 255      */
 256     virtual wxWebViewZoomType GetZoomType() const = 0;
 257
 258     /**
 259      * Retrieve whether the current HTML engine supports a type of zoom
 260      * @param type the type of zoom to test
 261      * @return whether this type of zoom is supported by this HTML engine
 262      *         (and thus can be set through setZoomType())
 263      */
 264     virtual bool CanSetZoomType(wxWebViewZoomType type) const = 0;
 265
 266     // TODO: allow 'SetPage' to find files (e.g. images) from a virtual file
 267     // system if possible
 268     /**
 269      * Set the displayed page source to the contents of the given string
 270      * @param html    the string that contains the HTML data to display
 271      * @param baseUrl URL assigned to the HTML data, to be used to resolve
 272      *                relative paths, for instance
 273      */
 274     virtual void SetPage(const wxString& html, const wxString& baseUrl) = 0;
 275
 276     /**
 277      * Set the displayed page source to the contents of the given stream
 278      * @param html    the stream to read HTML data from
 279      * @param baseUrl URL assigned to the HTML data, to be used to resolve
 280      *                relative paths, for instance
 281      */
 282     virtual void SetPage(wxInputStream& html, wxString baseUrl)
 283     {
 284         wxStringOutputStream stream;
 285         stream.Write(html);
 286         SetPage(stream.GetString(), baseUrl);
 287     }
 288
 289     virtual void SetEditable(bool enable = true) = 0;
 290     virtual bool IsEditable() = 0;
 291
 292     virtual void SelectAll() = 0;
 293     virtual bool HasSelection() = 0;
 294     virtual void DeleteSelection() = 0;
 295     virtual wxString GetSelectedText() = 0;
 296     virtual wxString GetSelectedSource() = 0;
 297     virtual void ClearSelection() = 0;
 298
 299     virtual void RunScript(const wxString& javascript) = 0;
 300
 301     // TODO:
 302     //     void EnableJavascript(bool enabled);             // maybe?
 303     //       // maybe?
 304
 305     //     void SetScrollPos(int pos);                      // maybe?
 306     //     int GetScrollPos();                              // maybe?
 307
 308     //     wxString GetStatusText();                        // maybe?
 309     //     void SetStatusText(wxString text);               // maybe?
 310     //     * status text changed event?
 311     //     * title changed event?
 312
 313     //    virtual bool IsOfflineMode() = 0;                 // maybe?
 314     //     virtual void SetOfflineMode(bool offline) = 0;   // maybe?
 315
 316     /**
 317      * Opens a print dialog so that the user may print the currently
 318      * displayed page.
 319      */
 320     virtual void Print() = 0;
 321
 322     /**
 323      * Returns whether the web control is currently busy (e.g. loading a page)
 324      */
 325     virtual bool IsBusy() = 0;
 326
 327     //Clipboard functions
 328     virtual bool CanCut() = 0;
 329     virtual bool CanCopy() = 0;
 330     virtual bool CanPaste() = 0;
 331     virtual void Cut() = 0;
 332     virtual void Copy() = 0;
 333     virtual void Paste() = 0;
 334
 335     //Undo / redo functionality
 336     virtual bool CanUndo() = 0;
 337     virtual bool CanRedo() = 0;
 338     virtual void Undo() = 0;
 339     virtual void Redo() = 0;
 340
 341     //Virtual Filesystem Support
 342     virtual void RegisterHandler(wxWebHandler* handler) = 0;
 343
 344     wxDECLARE_ABSTRACT_CLASS(wxWebView);
 345 };
 346
 347 class WXDLLIMPEXP_WEB wxWebNavigationEvent : public wxCommandEvent
 348 {
 349 public:
 350     wxWebNavigationEvent() {}
 351     wxWebNavigationEvent(wxEventType type, int id, const wxString url,
 352                          const wxString target, bool canVeto)
 353         : wxCommandEvent(type, id)
 354     {
 355         m_url = url;
 356         m_target = target;
 357         m_vetoed = false;
 358         m_canVeto = canVeto;
 359     }
 360
 361     /**
 362      *  Get the URL being visited
 363      */
 364     const wxString& GetURL() const { return m_url; }
 365
 366     /**
 367      * Get the target (frame or window) in which the URL that caused this event
 368      * is viewed, or an empty string if not available.
 369      */
 370     const wxString& GetTarget() const { return m_target; }
 371
 372     // default copy ctor, assignment operator and dtor are ok
 373     virtual wxEvent* Clone() const { return new wxWebNavigationEvent(*this); }
 374
 375     /** Get whether this event may be vetoed (stopped/prevented). Only
 376       *  meaningful for events fired before navigation takes place.
 377       */
 378     bool CanVeto() const { return m_canVeto; }
 379
 380     /** Whether this event was vetoed (stopped/prevented). Only meaningful for
 381      *  events fired before navigation takes place.
 382      */
 383     bool IsVetoed() const { return m_vetoed; }
 384
 385     /** Veto (prevent/stop) this event. Only meaningful for events fired
 386      *  before navigation takes place. Only valid if CanVeto() returned true.
 387      */
 388     void Veto() { wxASSERT(m_canVeto); m_vetoed = true; }
 389
 390 private:
 391     wxString m_url;
 392     wxString m_target;
 393     bool m_canVeto;
 394     bool m_vetoed;
 395
 396     wxDECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxWebNavigationEvent);
 397 };
 398
 399 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NAVIGATING, wxWebNavigationEvent );
 400 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NAVIGATED, wxWebNavigationEvent );
 401 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_LOADED, wxWebNavigationEvent );
 402 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_ERROR, wxWebNavigationEvent );
 403 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_NEWWINDOW, wxWebNavigationEvent );
 404 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_WEB, wxEVT_COMMAND_WEB_VIEW_TITLE_CHANGED, wxWebNavigationEvent );
 405
 406 typedef void (wxEvtHandler::*wxWebNavigationEventFunction)
 407              (wxWebNavigationEvent&);
 408
 409 #define wxWebNavigationEventHandler(func) \
 410     wxEVENT_HANDLER_CAST(wxWebNavigationEventFunction, func)
 411
 412 #define EVT_WEB_VIEW_NAVIGATING(id, fn) \
 413     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NAVIGATING, id, \
 414                      wxHtmlNavigatingEventHandler(fn))
 415
 416 #define EVT_WEB_VIEW_NAVIGATED(id, fn) \
 417     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NAVIGATED, id, \
 418                      wxHtmlNavigatingEventHandler(fn))
 419
 420 #define EVT_WEB_VIEW_LOADED(id, fn) \
 421     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_LOADED, id, \
 422                      wxHtmlNavigatingEventHandler(fn))
 423
 424 #define EVT_WEB_VIEW_ERRROR(id, fn) \
 425     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_ERROR, id, \
 426                      wxHtmlNavigatingEventHandler(fn))
 427
 428 #define EVT_WEB_VIEW_NEWWINDOW(id, fn) \
 429     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_NEWWINDOW, id, \
 430                      wxHtmlNavigatingEventHandler(fn))
 431
 432 #define EVT_WEB_VIEW_TITLE_CHANGED(id, fn) \
 433     wx__DECLARE_EVT1(wxEVT_COMMAND_WEB_VIEW_TITLE_CHANGED, id, \
 434                      wxHtmlNavigatingEventHandler(fn))
 435
 436 #endif // wxUSE_WEB
 437
 438 #endif // _WX_WEB_VIEW_H_