include/wx/html/htmlcell.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        htmlcell.h
   3 // Purpose:     wxHtmlCell class is used by wxHtmlWindow/wxHtmlWinParser
   4 //              as a basic visual element of HTML page
   5 // Author:      Vaclav Slavik
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 1999 Vaclav Slavik
   8 // Licence:     wxWindows Licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11
  12 #ifndef _WX_HTMLCELL_H_
  13 #define _WX_HTMLCELL_H_
  14
  15 #if defined(__GNUG__) && !defined(__APPLE__)
  16 #pragma interface "htmlcell.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20
  21 #if wxUSE_HTML
  22
  23 #include "wx/html/htmltag.h"
  24 #include "wx/html/htmldefs.h"
  25 #include "wx/window.h"
  26
  27
  28 class WXDLLEXPORT wxHtmlLinkInfo;
  29 class WXDLLEXPORT wxHtmlCell;
  30 class WXDLLEXPORT wxHtmlContainerCell;
  31
  32
  33 // wxHtmlSelection is data holder with information about text selection.
  34 // Selection is defined by two positions (beginning and end of the selection)
  35 // and two leaf(!) cells at these positions.
  36 class WXDLLEXPORT wxHtmlSelection
  37 {
  38 public:
  39     wxHtmlSelection()
  40         : m_fromPos(wxDefaultPosition), m_toPos(wxDefaultPosition),
  41           m_fromCell(NULL), m_toCell(NULL) {}
  42
  43     void Set(const wxPoint& fromPos, wxHtmlCell *fromCell,
  44              const wxPoint& toPos, wxHtmlCell *toCell);
  45     void Set(wxHtmlCell *fromCell, wxHtmlCell *toCell);
  46
  47     const wxHtmlCell *GetFromCell() const { return m_fromCell; }
  48     const wxHtmlCell *GetToCell() const { return m_toCell; }
  49
  50     // these values are *relative* to From/To cell's origin:
  51     const wxPoint& GetFromPos() const { return m_fromPos; }
  52     const wxPoint& GetToPos() const { return m_toPos; }
  53
  54     const bool IsEmpty() const
  55         { return m_fromPos == wxDefaultPosition &&
  56                  m_toPos == wxDefaultPosition; }
  57
  58 private:
  59     wxPoint     m_fromPos,   m_toPos;
  60     wxHtmlCell *m_fromCell, *m_toCell;
  61 };
  62
  63
  64
  65 enum wxHtmlSelectionState
  66 {
  67     wxHTML_SEL_OUT,     // currently rendered cell is outside the selection
  68     wxHTML_SEL_IN,      // ... is inside selection
  69     wxHTML_SEL_CHANGING // ... is the cell on which selection state changes
  70 };
  71
  72 // Selection state is passed to wxHtmlCell::Draw so that it can render itself
  73 // differently e.g. when inside text selection or outside it.
  74 class WXDLLEXPORT wxHtmlRenderingState
  75 {
  76 public:
  77     wxHtmlRenderingState(wxHtmlSelection *s = NULL)
  78         : m_selection(s), m_selState(wxHTML_SEL_OUT) {}
  79     void SetSelection(wxHtmlSelection *s) { m_selection = s; }
  80     wxHtmlSelection *GetSelection() const { return m_selection; }
  81
  82     void SetSelectionState(wxHtmlSelectionState s) { m_selState = s; }
  83     wxHtmlSelectionState GetSelectionState() const { return m_selState; }
  84
  85     void SetFgColour(const wxColour& c) { m_fgColour = c; }
  86     const wxColour& GetFgColour() const { return m_fgColour; }
  87     void SetBgColour(const wxColour& c) { m_bgColour = c; }
  88     const wxColour& GetBgColour() const { return m_bgColour; }
  89
  90 private:
  91     wxHtmlSelection      *m_selection;
  92     wxHtmlSelectionState  m_selState;
  93     wxColour              m_fgColour, m_bgColour;
  94 };
  95
  96 // Flags for wxHtmlCell::FindCellByPos
  97 enum
  98 {
  99     wxHTML_FIND_EXACT             = 1,
 100     wxHTML_FIND_NEAREST_BEFORE    = 2,
 101     wxHTML_FIND_NEAREST_AFTER     = 4,
 102 };
 103
 104
 105
 106
 107 // ---------------------------------------------------------------------------
 108 // wxHtmlCell
 109 //                  Internal data structure. It represents fragments of parsed
 110 //                  HTML page - a word, picture, table, horizontal line and so
 111 //                  on.  It is used by wxHtmlWindow to represent HTML page in
 112 //                  memory.
 113 // ---------------------------------------------------------------------------
 114
 115
 116 class WXDLLEXPORT wxHtmlCell : public wxObject
 117 {
 118 public:
 119     wxHtmlCell();
 120     virtual ~wxHtmlCell();
 121
 122     void SetParent(wxHtmlContainerCell *p) {m_Parent = p;}
 123     wxHtmlContainerCell *GetParent() const {return m_Parent;}
 124
 125     int GetPosX() const {return m_PosX;}
 126     int GetPosY() const {return m_PosY;}
 127     int GetWidth() const {return m_Width;}
 128     int GetHeight() const {return m_Height;}
 129     int GetDescent() const {return m_Descent;}
 130
 131     const wxString& GetId() const { return m_id; }
 132     void SetId(const wxString& id) { m_id = id; }
 133
 134     // returns the link associated with this cell. The position is position
 135     // within the cell so it varies from 0 to m_Width, from 0 to m_Height
 136     virtual wxHtmlLinkInfo* GetLink(int WXUNUSED(x) = 0,
 137                                     int WXUNUSED(y) = 0) const
 138         { return m_Link; }
 139
 140     // return next cell among parent's cells
 141     wxHtmlCell *GetNext() const {return m_Next;}
 142     // returns first child cell (if there are any, i.e. if this is container):
 143     virtual wxHtmlCell* GetFirstChild() const { return NULL; }
 144
 145     // members writing methods
 146     virtual void SetPos(int x, int y) {m_PosX = x, m_PosY = y;}
 147     void SetLink(const wxHtmlLinkInfo& link);
 148     void SetNext(wxHtmlCell *cell) {m_Next = cell;}
 149
 150     // 1. adjust cell's width according to the fact that maximal possible width
 151     //    is w.  (this has sense when working with horizontal lines, tables
 152     //    etc.)
 153     // 2. prepare layout (=fill-in m_PosX, m_PosY (and sometime m_Height)
 154     //    members) = place items to fit window, according to the width w
 155     virtual void Layout(int w);
 156
 157     // renders the cell
 158     virtual void Draw(wxDC& WXUNUSED(dc),
 159                       int WXUNUSED(x), int WXUNUSED(y),
 160                       int WXUNUSED(view_y1), int WXUNUSED(view_y2),
 161                       wxHtmlRenderingState& WXUNUSED(state)) {}
 162
 163     // proceed drawing actions in case the cell is not visible (scrolled out of
 164     // screen).  This is needed to change fonts, colors and so on.
 165     virtual void DrawInvisible(wxDC& WXUNUSED(dc),
 166                                int WXUNUSED(x), int WXUNUSED(y),
 167                                wxHtmlRenderingState& WXUNUSED(state)) {}
 168
 169     // This method returns pointer to the FIRST cell for that
 170     // the condition
 171     // is true. It first checks if the condition is true for this
 172     // cell and then calls m_Next->Find(). (Note: it checks
 173     // all subcells if the cell is container)
 174     // Condition is unique condition identifier (see htmldefs.h)
 175     // (user-defined condition IDs should start from 10000)
 176     // and param is optional parameter
 177     // Example : m_Cell->Find(wxHTML_COND_ISANCHOR, "news");
 178     //   returns pointer to anchor news
 179     virtual const wxHtmlCell* Find(int condition, const void* param) const;
 180
 181     // This function is called when mouse button is clicked over the cell.
 182     //
 183     // Parent is pointer to wxHtmlWindow that generated the event
 184     // HINT: if this handling is not enough for you you should use
 185     //       wxHtmlWidgetCell
 186     virtual void OnMouseClick(wxWindow *parent, int x, int y, const wxMouseEvent& event);
 187
 188     // This method used to adjust pagebreak position. The parameter is variable
 189     // that contains y-coordinate of page break (= horizontal line that should
 190     // not be crossed by words, images etc.). If this cell cannot be divided
 191     // into two pieces (each one on another page) then it moves the pagebreak
 192     // few pixels up.
 193     //
 194     // Returned value : true if pagebreak was modified, false otherwise
 195     // Usage : while (container->AdjustPagebreak(&p)) {}
 196     virtual bool AdjustPagebreak(int *pagebreak,
 197                                  int *known_pagebreaks = NULL,
 198                                  int number_of_pages = 0) const;
 199
 200     // Sets cell's behaviour on pagebreaks (see AdjustPagebreak). Default
 201     // is true - the cell can be split on two pages
 202     void SetCanLiveOnPagebreak(bool can) { m_CanLiveOnPagebreak = can; }
 203
 204     // Returns y-coordinates that contraint the cell, i.e. left is highest
 205     // and right lowest coordinate such that the cell lays between then.
 206     // Note: this method does not return meaningful values if you haven't
 207     //       called Layout() before!
 208     virtual void GetHorizontalConstraints(int *left, int *right) const;
 209
 210     // Returns true for simple == terminal cells, i.e. not composite ones.
 211     // This if for internal usage only and may disappear in future versions!
 212     virtual bool IsTerminalCell() const { return TRUE; }
 213
 214     // Find a cell inside this cell positioned at the given coordinates
 215     // (relative to this's positions). Returns NULL if no such cell exists.
 216     // The flag can be used to specify whether to look for terminal or
 217     // nonterminal cells or both. In either case, returned cell is deepest
 218     // cell in cells tree that contains [x,y].
 219     virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y,
 220                                   unsigned flags = wxHTML_FIND_EXACT) const;
 221
 222     // Returns absolute position of the cell on HTML canvas
 223     wxPoint GetAbsPos() const;
 224
 225     // Returns first (last) terminal cell inside this cell. It may return NULL,
 226     // but it is rare -- only if there are no terminals in the tree.
 227     virtual wxHtmlCell *GetFirstTerminal() const
 228         { return wxConstCast(this, wxHtmlCell); }
 229     virtual wxHtmlCell *GetLastTerminal() const
 230         { return wxConstCast(this, wxHtmlCell); }
 231
 232     // Returns cell's depth, i.e. how far under the root cell it is
 233     // (if it is the root, depth is 0)
 234     unsigned GetDepth() const;
 235
 236     // Returns true if the cell appears before 'cell' in natural order of
 237     // cells (= as they are read). If cell A is (grand)parent of cell B,
 238     // then both A.IsBefore(B) and B.IsBefore(A) always return true.
 239     bool IsBefore(wxHtmlCell *cell) const;
 240
 241     // Converts the cell into text representation. If sel != NULL then
 242     // only part of the cell inside the selection is converted.
 243     virtual wxString ConvertToText(wxHtmlSelection *WXUNUSED(sel)) const
 244         { return wxEmptyString; }
 245
 246 protected:
 247     wxHtmlCell *m_Next;
 248             // pointer to the next cell
 249     wxHtmlContainerCell *m_Parent;
 250             // pointer to parent cell
 251     long m_Width, m_Height, m_Descent;
 252             // dimensions of fragment
 253             // m_Descent is used to position text&images..
 254     long m_PosX, m_PosY;
 255             // position where the fragment is drawn
 256     wxHtmlLinkInfo *m_Link;
 257             // destination address if this fragment is hypertext link, NULL otherwise
 258     bool m_CanLiveOnPagebreak;
 259             // true if this cell can be placed on pagebreak, false otherwise
 260     wxString m_id;
 261             // unique identifier of the cell, generated from "id" property of tags
 262
 263     DECLARE_NO_COPY_CLASS(wxHtmlCell)
 264 };
 265
 266
 267
 268
 269 // ----------------------------------------------------------------------------
 270 // Inherited cells:
 271 // ----------------------------------------------------------------------------
 272
 273
 274 // ----------------------------------------------------------------------------
 275 // wxHtmlWordCell
 276 //                  Single word in input stream.
 277 // ----------------------------------------------------------------------------
 278
 279 class WXDLLEXPORT wxHtmlWordCell : public wxHtmlCell
 280 {
 281 public:
 282     wxHtmlWordCell(const wxString& word, wxDC& dc);
 283     void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
 284               wxHtmlRenderingState& state);
 285     wxString ConvertToText(wxHtmlSelection *sel) const;
 286
 287 protected:
 288     void Split(wxDC& dc,
 289                const wxPoint& selFrom, const wxPoint& selTo,
 290                wxString& s1, wxString& s2, wxString& s3,
 291                unsigned& pos1, unsigned& pos2);
 292
 293     wxString m_Word;
 294 };
 295
 296
 297
 298
 299
 300 // Container contains other cells, thus forming tree structure of rendering
 301 // elements. Basic code of layout algorithm is contained in this class.
 302 class WXDLLEXPORT wxHtmlContainerCell : public wxHtmlCell
 303 {
 304 public:
 305     wxHtmlContainerCell(wxHtmlContainerCell *parent);
 306     ~wxHtmlContainerCell();
 307
 308     virtual void Layout(int w);
 309     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
 310                       wxHtmlRenderingState& state);
 311     virtual void DrawInvisible(wxDC& dc, int x, int y,
 312                                wxHtmlRenderingState& state);
 313     virtual bool AdjustPagebreak(int *pagebreak, int *known_pagebreaks = NULL, int number_of_pages = 0) const;
 314
 315     // insert cell at the end of m_Cells list
 316     void InsertCell(wxHtmlCell *cell);
 317
 318     // sets horizontal/vertical alignment
 319     void SetAlignHor(int al) {m_AlignHor = al; m_LastLayout = -1;}
 320     int GetAlignHor() const {return m_AlignHor;}
 321     void SetAlignVer(int al) {m_AlignVer = al; m_LastLayout = -1;}
 322     int GetAlignVer() const {return m_AlignVer;}
 323
 324     // sets left-border indentation. units is one of wxHTML_UNITS_* constants
 325     // what is combination of wxHTML_INDENT_*
 326     void SetIndent(int i, int what, int units = wxHTML_UNITS_PIXELS);
 327     // returns the indentation. ind is one of wxHTML_INDENT_* constants
 328     int GetIndent(int ind) const;
 329     // returns type of value returned by GetIndent(ind)
 330     int GetIndentUnits(int ind) const;
 331
 332     // sets alignment info based on given tag's params
 333     void SetAlign(const wxHtmlTag& tag);
 334     // sets floating width adjustment
 335     // (examples : 32 percent of parent container,
 336     // -15 pixels percent (this means 100 % - 15 pixels)
 337     void SetWidthFloat(int w, int units) {m_WidthFloat = w; m_WidthFloatUnits = units; m_LastLayout = -1;}
 338     void SetWidthFloat(const wxHtmlTag& tag, double pixel_scale = 1.0);
 339     // sets minimal height of this container.
 340     void SetMinHeight(int h, int align = wxHTML_ALIGN_TOP) {m_MinHeight = h; m_MinHeightAlign = align; m_LastLayout = -1;}
 341
 342     void SetBackgroundColour(const wxColour& clr) {m_UseBkColour = TRUE; m_BkColour = clr;}
 343     // returns background colour (of wxNullColour if none set), so that widgets can
 344     // adapt to it:
 345     wxColour GetBackgroundColour();
 346     void SetBorder(const wxColour& clr1, const wxColour& clr2) {m_UseBorder = TRUE; m_BorderColour1 = clr1, m_BorderColour2 = clr2;}
 347     virtual wxHtmlLinkInfo* GetLink(int x = 0, int y = 0) const;
 348     virtual const wxHtmlCell* Find(int condition, const void* param) const;
 349     virtual void OnMouseClick(wxWindow *parent, int x, int y, const wxMouseEvent& event);
 350     virtual void GetHorizontalConstraints(int *left, int *right) const;
 351
 352     virtual wxHtmlCell* GetFirstChild() const { return m_Cells; }
 353 #if WXWIN_COMPATIBILITY_2_4
 354     wxDEPRECATED( wxHtmlCell* GetFirstCell() const );
 355 #endif
 356
 357     // see comment in wxHtmlCell about this method
 358     virtual bool IsTerminalCell() const { return FALSE; }
 359
 360     virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y,
 361                                   unsigned flags = wxHTML_FIND_EXACT) const;
 362
 363     virtual wxHtmlCell *GetFirstTerminal() const;
 364     virtual wxHtmlCell *GetLastTerminal() const;
 365
 366 protected:
 367     void UpdateRenderingStatePre(wxHtmlRenderingState& state,
 368                                  wxHtmlCell *cell) const;
 369     void UpdateRenderingStatePost(wxHtmlRenderingState& state,
 370                                   wxHtmlCell *cell) const;
 371
 372 protected:
 373     int m_IndentLeft, m_IndentRight, m_IndentTop, m_IndentBottom;
 374             // indentation of subcells. There is always m_Indent pixels
 375             // big space between given border of the container and the subcells
 376             // it m_Indent < 0 it is in PERCENTS, otherwise it is in pixels
 377     int m_MinHeight, m_MinHeightAlign;
 378         // minimal height.
 379     wxHtmlCell *m_Cells, *m_LastCell;
 380             // internal cells, m_Cells points to the first of them, m_LastCell to the last one.
 381             // (LastCell is needed only to speed-up InsertCell)
 382     int m_AlignHor, m_AlignVer;
 383             // alignment horizontal and vertical (left, center, right)
 384     int m_WidthFloat, m_WidthFloatUnits;
 385             // width float is used in adjustWidth
 386     bool m_UseBkColour;
 387     wxColour m_BkColour;
 388             // background color of this container
 389     bool m_UseBorder;
 390     wxColour m_BorderColour1, m_BorderColour2;
 391             // borders color of this container
 392     int m_LastLayout;
 393             // if != -1 then call to Layout may be no-op
 394             // if previous call to Layout has same argument
 395
 396     DECLARE_NO_COPY_CLASS(wxHtmlContainerCell)
 397 };
 398
 399 #if WXWIN_COMPATIBILITY_2_4
 400 inline wxHtmlCell* wxHtmlContainerCell::GetFirstCell() const
 401     { return GetFirstChild(); }
 402 #endif
 403
 404
 405
 406
 407 // ---------------------------------------------------------------------------
 408 // wxHtmlColourCell
 409 //                  Color changer.
 410 // ---------------------------------------------------------------------------
 411
 412 class WXDLLEXPORT wxHtmlColourCell : public wxHtmlCell
 413 {
 414 public:
 415     wxHtmlColourCell(const wxColour& clr, int flags = wxHTML_CLR_FOREGROUND) : wxHtmlCell() {m_Colour = clr; m_Flags = flags;}
 416     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
 417                       wxHtmlRenderingState& state);
 418     virtual void DrawInvisible(wxDC& dc, int x, int y,
 419                                wxHtmlRenderingState& state);
 420
 421 protected:
 422     wxColour m_Colour;
 423     unsigned m_Flags;
 424 };
 425
 426
 427
 428
 429 //--------------------------------------------------------------------------------
 430 // wxHtmlFontCell
 431 //                  Sets actual font used for text rendering
 432 //--------------------------------------------------------------------------------
 433
 434 class WXDLLEXPORT wxHtmlFontCell : public wxHtmlCell
 435 {
 436 public:
 437     wxHtmlFontCell(wxFont *font) : wxHtmlCell() { m_Font = (*font); }
 438     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
 439                       wxHtmlRenderingState& state);
 440     virtual void DrawInvisible(wxDC& dc, int x, int y,
 441                                wxHtmlRenderingState& state);
 442
 443 protected:
 444     wxFont m_Font;
 445 };
 446
 447
 448
 449
 450
 451
 452 //--------------------------------------------------------------------------------
 453 // wxHtmlwidgetCell
 454 //                  This cell is connected with wxWindow object
 455 //                  You can use it to insert windows into HTML page
 456 //                  (buttons, input boxes etc.)
 457 //--------------------------------------------------------------------------------
 458
 459 class WXDLLEXPORT wxHtmlWidgetCell : public wxHtmlCell
 460 {
 461 public:
 462     // !!! wnd must have correct parent!
 463     // if w != 0 then the m_Wnd has 'floating' width - it adjust
 464     // it's width according to parent container's width
 465     // (w is percent of parent's width)
 466     wxHtmlWidgetCell(wxWindow *wnd, int w = 0);
 467     ~wxHtmlWidgetCell() { m_Wnd->Destroy(); }
 468     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
 469                       wxHtmlRenderingState& state);
 470     virtual void DrawInvisible(wxDC& dc, int x, int y,
 471                                wxHtmlRenderingState& state);
 472     virtual void Layout(int w);
 473
 474 protected:
 475     wxWindow* m_Wnd;
 476     int m_WidthFloat;
 477             // width float is used in adjustWidth (it is in percents)
 478
 479     DECLARE_NO_COPY_CLASS(wxHtmlWidgetCell)
 480 };
 481
 482
 483
 484 //--------------------------------------------------------------------------------
 485 // wxHtmlLinkInfo
 486 //                  Internal data structure. It represents hypertext link
 487 //--------------------------------------------------------------------------------
 488
 489 class WXDLLEXPORT wxHtmlLinkInfo : public wxObject
 490 {
 491 public:
 492     wxHtmlLinkInfo() : wxObject()
 493           { m_Href = m_Target = wxEmptyString; m_Event = NULL, m_Cell = NULL; }
 494     wxHtmlLinkInfo(const wxString& href, const wxString& target = wxEmptyString) : wxObject()
 495           { m_Href = href; m_Target = target; m_Event = NULL, m_Cell = NULL; }
 496     wxHtmlLinkInfo(const wxHtmlLinkInfo& l) : wxObject()
 497           { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
 498             m_Cell = l.m_Cell; }
 499     wxHtmlLinkInfo& operator=(const wxHtmlLinkInfo& l)
 500           { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
 501             m_Cell = l.m_Cell; return *this; }
 502
 503     void SetEvent(const wxMouseEvent *e) { m_Event = e; }
 504     void SetHtmlCell(const wxHtmlCell *e) { m_Cell = e; }
 505
 506     wxString GetHref() const { return m_Href; }
 507     wxString GetTarget() const { return m_Target; }
 508     const wxMouseEvent* GetEvent() const { return m_Event; }
 509     const wxHtmlCell* GetHtmlCell() const { return m_Cell; }
 510
 511 private:
 512     wxString m_Href, m_Target;
 513     const wxMouseEvent *m_Event;
 514     const wxHtmlCell *m_Cell;
 515 };
 516
 517
 518
 519 // ----------------------------------------------------------------------------
 520 // wxHtmlTerminalCellsInterator
 521 // ----------------------------------------------------------------------------
 522
 523 class WXDLLEXPORT wxHtmlTerminalCellsInterator
 524 {
 525 public:
 526     wxHtmlTerminalCellsInterator(const wxHtmlCell *from, const wxHtmlCell *to)
 527         : m_to(to), m_pos(from) {}
 528
 529     operator bool() const { return m_pos != NULL; }
 530     const wxHtmlCell* operator++();
 531     const wxHtmlCell* operator->() const { return m_pos; }
 532     const wxHtmlCell* operator*() const { return m_pos; }
 533
 534 private:
 535     const wxHtmlCell *m_to, *m_pos;
 536 };
 537
 538
 539
 540 #endif // wxUSE_HTML
 541
 542 #endif // _WX_HTMLCELL_H_
 543