include/wx/html/htmlwin.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlwin.h
   3 // Purpose:     wxHtmlWindow class for parsing & displaying HTML
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifndef _WX_HTMLWIN_H_
  12 #define _WX_HTMLWIN_H_
  13
  14 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  15 #pragma interface "htmlwin.h"
  16 #endif
  17
  18 #include "wx/defs.h"
  19 #if wxUSE_HTML
  20
  21 #include "wx/window.h"
  22 #include "wx/scrolwin.h"
  23 #include "wx/config.h"
  24 #include "wx/html/winpars.h"
  25 #include "wx/html/htmlcell.h"
  26 #include "wx/filesys.h"
  27 #include "wx/html/htmlfilt.h"
  28 #include "wx/filename.h"
  29
  30 class wxHtmlProcessor;
  31 class wxHtmlWinModule;
  32 class wxHtmlHistoryArray;
  33 class wxHtmlProcessorList;
  34 class WXDLLIMPEXP_HTML wxHtmlWinAutoScrollTimer;
  35
  36
  37 // wxHtmlWindow flags:
  38 #define wxHW_SCROLLBAR_NEVER    0x0002
  39 #define wxHW_SCROLLBAR_AUTO     0x0004
  40 #define wxHW_NO_SELECTION       0x0008
  41
  42 #define wxHW_DEFAULT_STYLE      wxHW_SCROLLBAR_AUTO
  43
  44
  45 // enums for wxHtmlWindow::OnOpeningURL
  46 enum wxHtmlOpeningStatus
  47 {
  48     wxHTML_OPEN,
  49     wxHTML_BLOCK,
  50     wxHTML_REDIRECT
  51 };
  52
  53 // ----------------------------------------------------------------------------
  54 // wxHtmlWindow
  55 //                  (This is probably the only class you will directly use.)
  56 //                  Purpose of this class is to display HTML page (either local
  57 //                  file or downloaded via HTTP protocol) in a window. Width of
  58 //                  window is constant - given in constructor - virtual height
  59 //                  is changed dynamicly depending on page size.  Once the
  60 //                  window is created you can set it's content by calling
  61 //                  SetPage(text) or LoadPage(filename).
  62 // ----------------------------------------------------------------------------
  63
  64 class WXDLLIMPEXP_HTML wxHtmlWindow : public wxScrolledWindow
  65 {
  66     DECLARE_DYNAMIC_CLASS(wxHtmlWindow)
  67     friend class wxHtmlWinModule;
  68
  69 public:
  70     wxHtmlWindow() { Init(); }
  71     wxHtmlWindow(wxWindow *parent, wxWindowID id = -1,
  72                  const wxPoint& pos = wxDefaultPosition,
  73                  const wxSize& size = wxDefaultSize,
  74                  long style = wxHW_DEFAULT_STYLE,
  75                  const wxString& name = wxT("htmlWindow"))
  76     {
  77         Init();
  78         Create(parent, id, pos, size, style, name);
  79     }
  80     ~wxHtmlWindow();
  81
  82     bool Create(wxWindow *parent, wxWindowID id = -1,
  83                 const wxPoint& pos = wxDefaultPosition,
  84                 const wxSize& size = wxDefaultSize,
  85                 long style = wxHW_SCROLLBAR_AUTO,
  86                 const wxString& name = wxT("htmlWindow"));
  87
  88     // Set HTML page and display it. !! source is HTML document itself,
  89     // it is NOT address/filename of HTML document. If you want to
  90     // specify document location, use LoadPage() istead
  91     // Return value : FALSE if an error occured, TRUE otherwise
  92     bool SetPage(const wxString& source);
  93
  94     // Append to current page
  95     bool AppendToPage(const wxString& source);
  96
  97     // Load HTML page from given location. Location can be either
  98     // a) /usr/wxGTK2/docs/html/wx.htm
  99     // b) http://www.somewhere.uk/document.htm
 100     // c) ftp://ftp.somesite.cz/pub/something.htm
 101     // In case there is no prefix (http:,ftp:), the method
 102     // will try to find it itself (1. local file, then http or ftp)
 103     // After the page is loaded, the method calls SetPage() to display it.
 104     // Note : you can also use path relative to previously loaded page
 105     // Return value : same as SetPage
 106     virtual bool LoadPage(const wxString& location);
 107
 108     // Loads HTML page from file
 109     bool LoadFile(const wxFileName& filename);
 110
 111     // Returns full location of opened page
 112     wxString GetOpenedPage() const {return m_OpenedPage;}
 113     // Returns anchor within opened page
 114     wxString GetOpenedAnchor() const {return m_OpenedAnchor;}
 115     // Returns <TITLE> of opened page or empty string otherwise
 116     wxString GetOpenedPageTitle() const {return m_OpenedPageTitle;}
 117
 118     // Sets frame in which page title will  be displayed. Format is format of
 119     // frame title, e.g. "HtmlHelp : %s". It must contain exactly one %s
 120     void SetRelatedFrame(wxFrame* frame, const wxString& format);
 121     wxFrame* GetRelatedFrame() const {return m_RelatedFrame;}
 122
 123 #if wxUSE_STATUSBAR
 124     // After(!) calling SetRelatedFrame, this sets statusbar slot where messages
 125     // will be displayed. Default is -1 = no messages.
 126     void SetRelatedStatusBar(int bar);
 127 #endif // wxUSE_STATUSBAR
 128
 129     // Sets fonts to be used when displaying HTML page.
 130     void SetFonts(wxString normal_face, wxString fixed_face,
 131                   const int *sizes = NULL);
 132
 133     // Sets space between text and window borders.
 134     void SetBorders(int b) {m_Borders = b;}
 135
 136     // Saves custom settings into cfg config. it will use the path 'path'
 137     // if given, otherwise it will save info into currently selected path.
 138     // saved values : things set by SetFonts, SetBorders.
 139     virtual void ReadCustomization(wxConfigBase *cfg, wxString path = wxEmptyString);
 140     // ...
 141     virtual void WriteCustomization(wxConfigBase *cfg, wxString path = wxEmptyString);
 142
 143     // Goes to previous/next page (in browsing history)
 144     // Returns TRUE if successful, FALSE otherwise
 145     bool HistoryBack();
 146     bool HistoryForward();
 147     bool HistoryCanBack();
 148     bool HistoryCanForward();
 149     // Resets history
 150     void HistoryClear();
 151
 152     // Returns pointer to conteiners/cells structure.
 153     // It should be used ONLY when printing
 154     wxHtmlContainerCell* GetInternalRepresentation() const {return m_Cell;}
 155
 156     // Adds input filter
 157     static void AddFilter(wxHtmlFilter *filter);
 158
 159     // Returns a pointer to the parser.
 160     wxHtmlWinParser *GetParser() const { return m_Parser; }
 161
 162     // Adds HTML processor to this instance of wxHtmlWindow:
 163     void AddProcessor(wxHtmlProcessor *processor);
 164     // Adds HTML processor to wxHtmlWindow class as whole:
 165     static void AddGlobalProcessor(wxHtmlProcessor *processor);
 166
 167     // -- Callbacks --
 168
 169     // Sets the title of the window
 170     // (depending on the information passed to SetRelatedFrame() method)
 171     virtual void OnSetTitle(const wxString& title);
 172
 173     // Called when the mouse hovers over a cell: (x, y) are logical coords
 174     // Default behaviour is to do nothing at all
 175     virtual void OnCellMouseHover(wxHtmlCell *cell, wxCoord x, wxCoord y);
 176
 177     // Called when user clicks on a cell. Default behavior is to call
 178     // OnLinkClicked() if this cell corresponds to a hypertext link
 179     virtual void OnCellClicked(wxHtmlCell *cell,
 180                                wxCoord x, wxCoord y,
 181                                const wxMouseEvent& event);
 182
 183     // Called when user clicked on hypertext link. Default behavior is to
 184     // call LoadPage(loc)
 185     virtual void OnLinkClicked(const wxHtmlLinkInfo& link);
 186
 187     // Called when wxHtmlWindow wants to fetch data from an URL (e.g. when
 188     // loading a page or loading an image). The data are downloaded if and only if
 189     // OnOpeningURL returns TRUE. If OnOpeningURL returns wxHTML_REDIRECT,
 190     // it must set *redirect to the new URL
 191     virtual wxHtmlOpeningStatus OnOpeningURL(wxHtmlURLType WXUNUSED(type),
 192                                              const wxString& WXUNUSED(url),
 193                                              wxString *WXUNUSED(redirect)) const
 194         { return wxHTML_OPEN; }
 195
 196 #if wxUSE_CLIPBOARD
 197     // Helper functions to select parts of page:
 198     void SelectWord(const wxPoint& pos);
 199     void SelectLine(const wxPoint& pos);
 200     void SelectAll();
 201
 202     // Convert selection to text:
 203     wxString SelectionToText() { return DoSelectionToText(m_selection); }
 204
 205     // Converts current page to text:
 206     wxString ToText();
 207 #endif
 208
 209     virtual void ApplyParentThemeBackground(const wxColour& WXUNUSED(bg))
 210         { /* do nothing */ }
 211
 212 protected:
 213     void Init();
 214
 215     // Scrolls to anchor of this name. (Anchor is #news
 216     // or #features etc. it is part of address sometimes:
 217     // http://www.ms.mff.cuni.cz/~vsla8348/wxhtml/index.html#news)
 218     // Return value : TRUE if anchor exists, FALSE otherwise
 219     bool ScrollToAnchor(const wxString& anchor);
 220
 221     // Prepares layout (= fill m_PosX, m_PosY for fragments) based on
 222     // actual size of window. This method also setup scrollbars
 223     void CreateLayout();
 224
 225     void OnEraseBackground(wxEraseEvent& event);
 226     void OnPaint(wxPaintEvent& event);
 227     void OnSize(wxSizeEvent& event);
 228     void OnMouseMove(wxMouseEvent& event);
 229     void OnMouseDown(wxMouseEvent& event);
 230     void OnMouseUp(wxMouseEvent& event);
 231 #if wxUSE_CLIPBOARD
 232     void OnKeyUp(wxKeyEvent& event);
 233     void OnDoubleClick(wxMouseEvent& event);
 234     void OnCopy(wxCommandEvent& event);
 235     void OnMouseEnter(wxMouseEvent& event);
 236     void OnMouseLeave(wxMouseEvent& event);
 237 #endif // wxUSE_CLIPBOARD
 238
 239     virtual void OnInternalIdle();
 240
 241     // Returns new filter (will be stored into m_DefaultFilter variable)
 242     virtual wxHtmlFilter *GetDefaultFilter() {return new wxHtmlFilterPlainText;}
 243
 244     // cleans static variables
 245     static void CleanUpStatics();
 246
 247     // Returns true if text selection is enabled (wxClipboard must be available
 248     // and wxHW_NO_SELECTION not used)
 249     bool IsSelectionEnabled() const;
 250
 251     enum ClipboardType
 252     {
 253         Primary,
 254         Secondary
 255     };
 256
 257     // Copies selection to clipboard if the clipboard support is available
 258     //
 259     // returns true if anything was copied to clipboard, false otherwise
 260     bool CopySelection(ClipboardType t = Secondary);
 261
 262 #if wxUSE_CLIPBOARD
 263     // Automatic scrolling during selection:
 264     void StopAutoScrolling();
 265 #endif // wxUSE_CLIPBOARD
 266
 267 protected:
 268     wxString DoSelectionToText(wxHtmlSelection *sel);
 269
 270     // This is pointer to the first cell in parsed data.  (Note: the first cell
 271     // is usually top one = all other cells are sub-cells of this one)
 272     wxHtmlContainerCell *m_Cell;
 273     // parser which is used to parse HTML input.
 274     // Each wxHtmlWindow has it's own parser because sharing one global
 275     // parser would be problematic (because of reentrancy)
 276     wxHtmlWinParser *m_Parser;
 277     // contains name of actualy opened page or empty string if no page opened
 278     wxString m_OpenedPage;
 279     // contains name of current anchor within m_OpenedPage
 280     wxString m_OpenedAnchor;
 281     // contains title of actualy opened page or empty string if no <TITLE> tag
 282     wxString m_OpenedPageTitle;
 283     // class for opening files (file system)
 284     wxFileSystem* m_FS;
 285
 286     wxFrame *m_RelatedFrame;
 287     wxString m_TitleFormat;
 288 #if wxUSE_STATUSBAR
 289     // frame in which page title should be displayed & number of it's statusbar
 290     // reserved for usage with this html window
 291     int m_RelatedStatusBar;
 292 #endif // wxUSE_STATUSBAR
 293
 294     // borders (free space between text and window borders)
 295     // defaults to 10 pixels.
 296     int m_Borders;
 297
 298     int m_Style;
 299
 300     // current text selection or NULL
 301     wxHtmlSelection *m_selection;
 302
 303     // true if the user is dragging mouse to select text
 304     bool m_makingSelection;
 305
 306 #if wxUSE_CLIPBOARD
 307     // time of the last doubleclick event, used to detect tripleclicks
 308     // (tripleclicks are used to select whole line):
 309     wxLongLong m_lastDoubleClick;
 310
 311     // helper class to automatically scroll the window if the user is selecting
 312     // text and the mouse leaves wxHtmlWindow:
 313     wxHtmlWinAutoScrollTimer *m_timerAutoScroll;
 314 #endif // wxUSE_CLIPBOARD
 315
 316 private:
 317     // window content for double buffered rendering:
 318     wxBitmap *m_backBuffer;
 319
 320     // variables used when user is selecting text
 321     wxPoint     m_tmpSelFromPos;
 322     wxHtmlCell *m_tmpSelFromCell;
 323
 324     // a flag indicated if mouse moved
 325     // (if TRUE we will try to change cursor in last call to OnIdle)
 326     bool m_tmpMouseMoved;
 327     // contains last link name
 328     wxHtmlLinkInfo *m_tmpLastLink;
 329     // contains the last (terminal) cell which contained the mouse
 330     wxHtmlCell *m_tmpLastCell;
 331     // if >0 contents of the window is not redrawn
 332     // (in order to avoid ugly blinking)
 333     int m_tmpCanDrawLocks;
 334
 335     // list of HTML filters
 336     static wxList m_Filters;
 337     // this filter is used when no filter is able to read some file
 338     static wxHtmlFilter *m_DefaultFilter;
 339
 340     wxHtmlHistoryArray *m_History;
 341     // browser history
 342     int m_HistoryPos;
 343     // if this FLAG is false, items are not added to history
 344     bool m_HistoryOn;
 345
 346     // html processors array:
 347     wxHtmlProcessorList *m_Processors;
 348     static wxHtmlProcessorList *m_GlobalProcessors;
 349
 350     DECLARE_EVENT_TABLE()
 351     DECLARE_NO_COPY_CLASS(wxHtmlWindow)
 352 };
 353
 354
 355 #endif // wxUSE_HTML
 356
 357 #endif // _WX_HTMLWIN_H_
 358