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 #ifdef __GNUG__
  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 // wxHtmlCell
  34 //                  Internal data structure. It represents fragments of parsed HTML
  35 //                  page - a word, picture, table, horizontal line and so on.
  36 //                  It is used by wxHtmlWindow to represent HTML page in memory.
  37 //--------------------------------------------------------------------------------
  38
  39
  40 class WXDLLEXPORT wxHtmlCell : public wxObject
  41 {
  42 public:
  43     wxHtmlCell();
  44     virtual ~wxHtmlCell();
  45
  46     void SetParent(wxHtmlContainerCell *p) {m_Parent = p;}
  47     wxHtmlContainerCell *GetParent() const {return m_Parent;}
  48
  49     int GetPosX() const {return m_PosX;}
  50     int GetPosY() const {return m_PosY;}
  51     int GetWidth() const {return m_Width;}
  52     int GetHeight() const {return m_Height;}
  53     int GetDescent() const {return m_Descent;}
  54
  55     const wxString& GetId() const { return m_id; }
  56     void SetId(const wxString& id) { m_id = id; }
  57
  58     // returns the link associated with this cell. The position is position within
  59     // the cell so it varies from 0 to m_Width, from 0 to m_Height
  60     virtual wxHtmlLinkInfo* GetLink(int WXUNUSED(x) = 0, int WXUNUSED(y) = 0) const
  61         { return m_Link; }
  62
  63     // members access methods
  64     wxHtmlCell *GetNext() const {return m_Next;}
  65
  66     // members writing methods
  67     virtual void SetPos(int x, int y) {m_PosX = x, m_PosY = y;}
  68     void SetLink(const wxHtmlLinkInfo& link);
  69     void SetNext(wxHtmlCell *cell) {m_Next = cell;}
  70
  71     // 1. adjust cell's width according to the fact that maximal possible width is w.
  72     //    (this has sense when working with horizontal lines, tables etc.)
  73     // 2. prepare layout (=fill-in m_PosX, m_PosY (and sometime m_Height) members)
  74     //    = place items to fit window, according to the width w
  75     virtual void Layout(int w);
  76
  77     // renders the cell
  78     virtual void Draw(wxDC& WXUNUSED(dc), int WXUNUSED(x), int WXUNUSED(y), int WXUNUSED(view_y1), int WXUNUSED(view_y2)) {}
  79
  80     // proceed drawing actions in case the cell is not visible (scrolled out of screen).
  81     // This is needed to change fonts, colors and so on
  82     virtual void DrawInvisible(wxDC& WXUNUSED(dc), int WXUNUSED(x), int WXUNUSED(y)) {}
  83
  84     // This method returns pointer to the FIRST cell for that
  85     // the condition
  86     // is true. It first checks if the condition is true for this
  87     // cell and then calls m_Next->Find(). (Note: it checks
  88     // all subcells if the cell is container)
  89     // Condition is unique condition identifier (see htmldefs.h)
  90     // (user-defined condition IDs should start from 10000)
  91     // and param is optional parameter
  92     // Example : m_Cell->Find(wxHTML_COND_ISANCHOR, "news");
  93     //   returns pointer to anchor news
  94     virtual const wxHtmlCell* Find(int condition, const void* param) const;
  95
  96     // This function is called when mouse button is clicked over the cell.
  97     //
  98     // Parent is pointer to wxHtmlWindow that generated the event
  99     // HINT: if this handling is not enough for you you should use
 100     //       wxHtmlWidgetCell
 101     virtual void OnMouseClick(wxWindow *parent, int x, int y, const wxMouseEvent& event);
 102
 103     // This method used to adjust pagebreak position. The parameter is
 104     // variable that contains y-coordinate of page break (= horizontal line that
 105     // should not be crossed by words, images etc.). If this cell cannot be divided
 106     // into two pieces (each one on another page) then it moves the pagebreak
 107     // few pixels up.
 108     //
 109     // Returned value : true if pagebreak was modified, false otherwise
 110     // Usage : while (container->AdjustPagebreak(&p)) {}
 111     virtual bool AdjustPagebreak(int *pagebreak) const;
 112
 113     // Sets cell's behaviour on pagebreaks (see AdjustPagebreak). Default
 114     // is true - the cell can be split on two pages
 115     void SetCanLiveOnPagebreak(bool can) { m_CanLiveOnPagebreak = can; }
 116
 117     // Returns y-coordinates that contraint the cell, i.e. left is highest
 118     // and right lowest coordinate such that the cell lays between then.
 119     // Note: this method does not return meaningful values if you haven't
 120     //       called Layout() before!
 121     virtual void GetHorizontalConstraints(int *left, int *right) const;
 122
 123     // Returns true for simple == terminal cells, i.e. not composite ones.
 124     // This if for internal usage only and may disappear in future versions!
 125     virtual bool IsTerminalCell() const { return TRUE; }
 126
 127     // Find the terminal cell inside this cell at the given position (relative
 128     // to this cell)
 129     //
 130     // Returns NULL if not found
 131     virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y) const;
 132
 133 protected:
 134     wxHtmlCell *m_Next;
 135             // pointer to the next cell
 136     wxHtmlContainerCell *m_Parent;
 137             // pointer to parent cell
 138     long m_Width, m_Height, m_Descent;
 139             // dimensions of fragment
 140             // m_Descent is used to position text&images..
 141     long m_PosX, m_PosY;
 142             // position where the fragment is drawn
 143     wxHtmlLinkInfo *m_Link;
 144             // destination address if this fragment is hypertext link, NULL otherwise
 145     bool m_CanLiveOnPagebreak;
 146             // true if this cell can be placed on pagebreak, false otherwise
 147     wxString m_id;
 148             // unique identifier of the cell, generated from "id" property of tags
 149 };
 150
 151
 152
 153
 154 //--------------------------------------------------------------------------------
 155 // Inherited cells:
 156 //--------------------------------------------------------------------------------
 157
 158
 159 //--------------------------------------------------------------------------------
 160 // wxHtmlWordCell
 161 //                  Single word in input stream.
 162 //--------------------------------------------------------------------------------
 163
 164 class WXDLLEXPORT wxHtmlWordCell : public wxHtmlCell
 165 {
 166 public:
 167     wxHtmlWordCell(const wxString& word, wxDC& dc);
 168     void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 169
 170 protected:
 171     wxString m_Word;
 172 };
 173
 174
 175
 176
 177
 178 //--------------------------------------------------------------------------------
 179 // wxHtmlContainerCell
 180 //                  Container - it contains other cells. Basic of layout algorithm.
 181 //--------------------------------------------------------------------------------
 182
 183 class WXDLLEXPORT wxHtmlContainerCell : public wxHtmlCell
 184 {
 185 public:
 186     wxHtmlContainerCell(wxHtmlContainerCell *parent);
 187     ~wxHtmlContainerCell();
 188
 189     virtual void Layout(int w);
 190     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 191     virtual void DrawInvisible(wxDC& dc, int x, int y);
 192     virtual bool AdjustPagebreak(int *pagebreak) const;
 193
 194     // insert cell at the end of m_Cells list
 195     void InsertCell(wxHtmlCell *cell);
 196
 197     // sets horizontal/vertical alignment
 198     void SetAlignHor(int al) {m_AlignHor = al; m_LastLayout = -1;}
 199     int GetAlignHor() const {return m_AlignHor;}
 200     void SetAlignVer(int al) {m_AlignVer = al; m_LastLayout = -1;}
 201     int GetAlignVer() const {return m_AlignVer;}
 202
 203     // sets left-border indentation. units is one of wxHTML_UNITS_* constants
 204     // what is combination of wxHTML_INDENT_*
 205     void SetIndent(int i, int what, int units = wxHTML_UNITS_PIXELS);
 206     // returns the indentation. ind is one of wxHTML_INDENT_* constants
 207     int GetIndent(int ind) const;
 208     // returns type of value returned by GetIndent(ind)
 209     int GetIndentUnits(int ind) const;
 210
 211     // sets alignment info based on given tag's params
 212     void SetAlign(const wxHtmlTag& tag);
 213     // sets floating width adjustment
 214     // (examples : 32 percent of parent container,
 215     // -15 pixels percent (this means 100 % - 15 pixels)
 216     void SetWidthFloat(int w, int units) {m_WidthFloat = w; m_WidthFloatUnits = units; m_LastLayout = -1;}
 217     void SetWidthFloat(const wxHtmlTag& tag, double pixel_scale = 1.0);
 218     // sets minimal height of this container.
 219     void SetMinHeight(int h, int align = wxHTML_ALIGN_TOP) {m_MinHeight = h; m_MinHeightAlign = align; m_LastLayout = -1;}
 220
 221     void SetBackgroundColour(const wxColour& clr) {m_UseBkColour = TRUE; m_BkColour = clr;}
 222     void SetBorder(const wxColour& clr1, const wxColour& clr2) {m_UseBorder = TRUE; m_BorderColour1 = clr1, m_BorderColour2 = clr2;}
 223     virtual wxHtmlLinkInfo* GetLink(int x = 0, int y = 0) const;
 224     virtual const wxHtmlCell* Find(int condition, const void* param) const;
 225     virtual void OnMouseClick(wxWindow *parent, int x, int y, const wxMouseEvent& event);
 226     virtual void GetHorizontalConstraints(int *left, int *right) const;
 227
 228     // returns pointer to the first cell in container or NULL
 229     wxHtmlCell* GetFirstCell() const {return m_Cells;}
 230
 231     // see comment in wxHtmlCell about this method
 232     virtual bool IsTerminalCell() const { return FALSE; }
 233
 234     virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y) const;
 235
 236 protected:
 237     int m_IndentLeft, m_IndentRight, m_IndentTop, m_IndentBottom;
 238             // indentation of subcells. There is always m_Indent pixels
 239             // big space between given border of the container and the subcells
 240             // it m_Indent < 0 it is in PERCENTS, otherwise it is in pixels
 241     int m_MinHeight, m_MinHeightAlign;
 242         // minimal height.
 243     wxHtmlCell *m_Cells, *m_LastCell;
 244             // internal cells, m_Cells points to the first of them, m_LastCell to the last one.
 245             // (LastCell is needed only to speed-up InsertCell)
 246     int m_AlignHor, m_AlignVer;
 247             // alignment horizontal and vertical (left, center, right)
 248     int m_WidthFloat, m_WidthFloatUnits;
 249             // width float is used in adjustWidth
 250     bool m_UseBkColour;
 251     wxColour m_BkColour;
 252             // background color of this container
 253     bool m_UseBorder;
 254     wxColour m_BorderColour1, m_BorderColour2;
 255             // borders color of this container
 256     int m_LastLayout;
 257             // if != -1 then call to Layout may be no-op
 258             // if previous call to Layout has same argument
 259 };
 260
 261
 262
 263
 264
 265 //--------------------------------------------------------------------------------
 266 // wxHtmlColourCell
 267 //                  Color changer.
 268 //--------------------------------------------------------------------------------
 269
 270 class WXDLLEXPORT wxHtmlColourCell : public wxHtmlCell
 271 {
 272 public:
 273     wxHtmlColourCell(const wxColour& clr, int flags = wxHTML_CLR_FOREGROUND) : wxHtmlCell() {m_Colour = clr; m_Flags = flags;}
 274     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 275     virtual void DrawInvisible(wxDC& dc, int x, int y);
 276
 277 protected:
 278     wxColour m_Colour;
 279     unsigned m_Flags;
 280 };
 281
 282
 283
 284
 285 //--------------------------------------------------------------------------------
 286 // wxHtmlFontCell
 287 //                  Sets actual font used for text rendering
 288 //--------------------------------------------------------------------------------
 289
 290 class WXDLLEXPORT wxHtmlFontCell : public wxHtmlCell
 291 {
 292 public:
 293     wxHtmlFontCell(wxFont *font) : wxHtmlCell() { m_Font = (*font); }
 294     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 295     virtual void DrawInvisible(wxDC& dc, int x, int y);
 296
 297 protected:
 298     wxFont m_Font;
 299 };
 300
 301
 302
 303
 304
 305
 306 //--------------------------------------------------------------------------------
 307 // wxHtmlwidgetCell
 308 //                  This cell is connected with wxWindow object
 309 //                  You can use it to insert windows into HTML page
 310 //                  (buttons, input boxes etc.)
 311 //--------------------------------------------------------------------------------
 312
 313 class WXDLLEXPORT wxHtmlWidgetCell : public wxHtmlCell
 314 {
 315 public:
 316     // !!! wnd must have correct parent!
 317     // if w != 0 then the m_Wnd has 'floating' width - it adjust
 318     // it's width according to parent container's width
 319     // (w is percent of parent's width)
 320     wxHtmlWidgetCell(wxWindow *wnd, int w = 0);
 321     ~wxHtmlWidgetCell() { m_Wnd->Destroy(); }
 322     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 323     virtual void DrawInvisible(wxDC& dc, int x, int y);
 324     virtual void Layout(int w);
 325
 326 protected:
 327     wxWindow* m_Wnd;
 328     int m_WidthFloat;
 329             // width float is used in adjustWidth (it is in percents)
 330 };
 331
 332
 333
 334 //--------------------------------------------------------------------------------
 335 // wxHtmlLinkInfo
 336 //                  Internal data structure. It represents hypertext link
 337 //--------------------------------------------------------------------------------
 338
 339 class WXDLLEXPORT wxHtmlLinkInfo : public wxObject
 340 {
 341 public:
 342     wxHtmlLinkInfo() : wxObject()
 343           { m_Href = m_Target = wxEmptyString; m_Event = NULL, m_Cell = NULL; }
 344     wxHtmlLinkInfo(const wxString& href, const wxString& target = wxEmptyString) : wxObject()
 345           { m_Href = href; m_Target = target; m_Event = NULL, m_Cell = NULL; }
 346     wxHtmlLinkInfo(const wxHtmlLinkInfo& l) : wxObject()
 347           { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
 348             m_Cell = l.m_Cell; }
 349     wxHtmlLinkInfo& operator=(const wxHtmlLinkInfo& l)
 350           { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
 351             m_Cell = l.m_Cell; return *this; }
 352
 353     void SetEvent(const wxMouseEvent *e) { m_Event = e; }
 354     void SetHtmlCell(const wxHtmlCell *e) { m_Cell = e; }
 355
 356     wxString GetHref() const { return m_Href; }
 357     wxString GetTarget() const { return m_Target; }
 358     const wxMouseEvent* GetEvent() const { return m_Event; }
 359     const wxHtmlCell* GetHtmlCell() const { return m_Cell; }
 360
 361 private:
 362     wxString m_Href, m_Target;
 363     const wxMouseEvent *m_Event;
 364     const wxHtmlCell *m_Cell;
 365 };
 366
 367
 368
 369
 370 #endif // wxUSE_HTML
 371
 372 #endif // _WX_HTMLCELL_H_
 373