interface/wx/html/htmlcell.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        html/htmlcell.h
   3 // Purpose:     interface of wxHtml*Cell
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10
  11 /**
  12     @class wxHtmlRenderingStyle
  13
  14     Allows HTML rendering customizations.
  15     This class is used when rendering wxHtmlCells as a callback.
  16
  17     @library{wxhtml}
  18     @category{html}
  19
  20     @see wxHtmlRenderingInfo
  21 */
  22 class wxHtmlRenderingStyle
  23 {
  24 public:
  25     /**
  26         Returns the colour to use for the selected text.
  27     */
  28     virtual wxColour GetSelectedTextColour(const wxColour& clr) = 0;
  29
  30     /**
  31         Returns the colour to use for the selected text's background.
  32     */
  33     virtual wxColour GetSelectedTextBgColour(const wxColour& clr) = 0;
  34 };
  35
  36
  37 /**
  38     @class wxHtmlRenderingInfo
  39
  40     This class contains information given to cells when drawing them.
  41     Contains rendering state, selection information and rendering style object
  42     that can be used to customize the output.
  43
  44     @library{wxhtml}
  45     @category{html}
  46
  47     @see @ref overview_html_cells, wxHtmlCell
  48 */
  49 class wxHtmlRenderingInfo
  50 {
  51 public:
  52     /**
  53         Default ctor.
  54     */
  55     wxHtmlRenderingInfo();
  56
  57     //@{
  58     /**
  59         Accessors.
  60     */
  61     void SetSelection(wxHtmlSelection *s);
  62     wxHtmlSelection *GetSelection() const;
  63
  64     void SetStyle(wxHtmlRenderingStyle *style);
  65     wxHtmlRenderingStyle& GetStyle();
  66
  67     wxHtmlRenderingState& GetState();
  68     //@}
  69 };
  70
  71
  72 /**
  73     @class wxHtmlCell
  74
  75     Internal data structure. It represents fragments of parsed HTML page, the
  76     so-called @b cell - a word, picture, table, horizontal line and so on.
  77     It is used by wxHtmlWindow and wxHtmlWinParser to represent HTML page in memory.
  78
  79     You can divide cells into two groups : @e visible cells with non-zero width and
  80     height and @e helper cells (usually with zero width and height) that perform
  81     special actions such as color or font change.
  82
  83     @library{wxhtml}
  84     @category{html}
  85
  86     @see @ref overview_html_cells, wxHtmlContainerCell
  87 */
  88 class wxHtmlCell : public wxObject
  89 {
  90 public:
  91     /**
  92         Constructor.
  93     */
  94     wxHtmlCell();
  95
  96     /**
  97         This method is used to adjust pagebreak position.
  98         The parameter is variable that contains y-coordinate of page break
  99         (= horizontal line that should not be crossed by words, images etc.).
 100         If this cell cannot be divided into two pieces (each one on another page)
 101         then it moves the pagebreak few pixels up.
 102         Returns @true if pagebreak was modified, @false otherwise.
 103
 104         Usage:
 105         @code
 106         while (container->AdjustPagebreak(&p)) {}
 107         @endcode
 108     */
 109     virtual bool AdjustPagebreak(int* pagebreak,
 110                                  wxArrayInt& known_pagebreaks) const;
 111
 112     /**
 113         Renders the cell.
 114
 115         @param dc
 116             Device context to which the cell is to be drawn.
 117         @param x,y
 118             Coordinates of parent's upper left corner (origin). You must
 119             add this to m_PosX,m_PosY when passing coordinates to dc's methods
 120             Example:
 121             @code
 122                 dc->DrawText("hello", x + m_PosX, y + m_PosY)
 123             @endcode
 124         @param view_y1
 125             y-coord of the first line visible in window.
 126             This is used to optimize rendering speed.
 127         @param view_y2
 128             y-coord of the last line visible in window.
 129             This is used to optimize rendering speed.
 130         @param info
 131             Additional information for the rendering of the cell.
 132     */
 133     virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2, wxHtmlRenderingInfo& info);
 134
 135     /**
 136         This method is called instead of Draw() when the cell is certainly out of
 137         the screen (and thus invisible). This is not nonsense - some tags (like
 138         wxHtmlColourCell or font setter) must be drawn even if they are invisible!
 139
 140         @param dc
 141             Device context to which the cell is to be drawn.
 142         @param x,y
 143             Coordinates of parent's upper left corner. You must
 144             add this to m_PosX,m_PosY when passing coordinates to dc's methods
 145             Example:
 146             @code
 147                 dc->DrawText("hello", x + m_PosX, y + m_PosY)
 148             @endcode
 149         @param info
 150             Additional information for the rendering of the cell.
 151     */
 152     virtual void DrawInvisible(wxDC& dc, int x , int y, wxHtmlRenderingInfo& info);
 153
 154     /**
 155         Returns pointer to itself if this cell matches condition (or if any of the
 156         cells following in the list matches), @NULL otherwise.
 157         (In other words if you call top-level container's Find() it will
 158         return pointer to the first cell that matches the condition)
 159
 160         It is recommended way how to obtain pointer to particular cell or
 161         to cell of some type (e.g. wxHtmlAnchorCell reacts on wxHTML_COND_ISANCHOR
 162         condition).
 163
 164         @param condition
 165             Unique integer identifier of condition
 166         @param param
 167             Optional parameters
 168     */
 169     virtual const wxHtmlCell* Find(int condition, const void* param) const;
 170
 171     /**
 172         Returns descent value of the cell (m_Descent member).
 173         See explanation:
 174         @image html htmlcell_descent.png
 175     */
 176     int GetDescent() const;
 177
 178     /**
 179         Returns pointer to the first cell in the list.
 180         You can then use child's GetNext() method to obtain pointer to the next
 181         cell in list.
 182
 183         @note This shouldn't be used by the end user. If you need some way of
 184               finding particular cell in the list, try Find() method instead.
 185     */
 186     virtual wxHtmlCell* GetFirstChild() const;
 187
 188     /**
 189         Returns height of the cell (m_Height member).
 190     */
 191     int GetHeight() const;
 192
 193     /**
 194         Returns unique cell identifier if there is any, the empty string otherwise.
 195     */
 196     const wxString& GetId() const;
 197
 198     /**
 199         Returns hypertext link if associated with this cell or @NULL otherwise.
 200         See wxHtmlLinkInfo. (Note: this makes sense only for visible tags).
 201
 202         @param x,y
 203             Coordinates of position where the user pressed mouse button.
 204             These coordinates are used e.g. by COLORMAP. Values are relative to the
 205             upper left corner of THIS cell (i.e. from 0 to m_Width or m_Height)
 206     */
 207     virtual wxHtmlLinkInfo* GetLink(int x = 0, int y = 0) const;
 208
 209     /**
 210         Returns cursor to show when mouse pointer is over the cell.
 211
 212         @param window
 213             interface to the parent HTML window
 214     */
 215     virtual wxCursor GetMouseCursor(wxHtmlWindowInterface* window) const;
 216
 217     /**
 218         Returns pointer to the next cell in list (see htmlcell.h if you're
 219         interested in details).
 220     */
 221     wxHtmlCell* GetNext() const;
 222
 223     /**
 224         Returns pointer to parent container.
 225     */
 226     wxHtmlContainerCell* GetParent() const;
 227
 228     /**
 229         Returns X position within parent (the value is relative to parent's
 230         upper left corner). The returned value is meaningful only if
 231         parent's Layout() was called before!
 232     */
 233     int GetPosX() const;
 234
 235     /**
 236         Returns Y position within parent (the value is relative to parent's
 237         upper left corner). The returned value is meaningful only if
 238         parent's Layout() was called before!
 239     */
 240     int GetPosY() const;
 241
 242     /**
 243         Returns width of the cell (m_Width member).
 244     */
 245     int GetWidth() const;
 246
 247     /**
 248         This method performs two actions:
 249         -# adjusts the cell's width according to the fact that maximal possible
 250            width is @e w. (this has sense when working with horizontal lines, tables etc.)
 251         -# prepares layout (=fill-in m_PosX, m_PosY (and sometimes m_Height) members)
 252            based on actual width @e w
 253
 254         It must be called before displaying cells structure because m_PosX and
 255         m_PosY are undefined (or invalid) before calling Layout().
 256     */
 257     virtual void Layout(int w);
 258
 259     /**
 260         This function is simple event handler.
 261         Each time the user clicks mouse button over a cell within wxHtmlWindow
 262         this method of that cell is called.
 263         Default behavior is to call wxHtmlWindow::LoadPage.
 264
 265         @param window
 266             interface to the parent HTML window
 267         @param pos
 268             coordinates of mouse click (this is relative to cell's origin
 269         @param event
 270             mouse event that triggered the call
 271
 272         @return @true if a link was clicked, @false otherwise.
 273
 274         @since 2.7.0 (before OnMouseClick() method served a similar purpose).
 275
 276         @note
 277         If you need more "advanced" event handling you should use wxHtmlBinderCell instead.
 278     */
 279     virtual bool ProcessMouseClick(wxHtmlWindowInterface* window,
 280                                    const wxPoint& pos,
 281                                    const wxMouseEvent& event);
 282
 283     /**
 284         Sets unique cell identifier. Default value is no identifier, i.e. empty string.
 285     */
 286     void SetId(const wxString& id);
 287
 288     /**
 289         Sets the hypertext link associated with this cell.
 290         (Default value is wxHtmlLinkInfo("", "") (no link))
 291     */
 292     void SetLink(const wxHtmlLinkInfo& link);
 293
 294     /**
 295         Sets the next cell in the list. This shouldn't be called by user - it is
 296         to be used only by wxHtmlContainerCell::InsertCell.
 297     */
 298     void SetNext(wxHtmlCell* cell);
 299
 300     /**
 301         Sets parent container of this cell.
 302         This is called from wxHtmlContainerCell::InsertCell.
 303     */
 304     void SetParent(wxHtmlContainerCell* p);
 305
 306     /**
 307         Sets the cell's position within parent container.
 308     */
 309     virtual void SetPos(int x, int y);
 310 };
 311
 312
 313
 314 /**
 315     @class wxHtmlContainerCell
 316
 317     The wxHtmlContainerCell class is an implementation of a cell that may
 318     contain more cells in it. It is heavily used in the wxHTML layout algorithm.
 319
 320     @library{wxhtml}
 321     @category{html}
 322
 323     @see @ref overview_html_cells
 324 */
 325 class wxHtmlContainerCell : public wxHtmlCell
 326 {
 327 public:
 328     /**
 329         Constructor. @a parent is pointer to parent container or @NULL.
 330     */
 331     wxHtmlContainerCell(wxHtmlContainerCell* parent);
 332
 333     /**
 334         Returns container's horizontal alignment.
 335     */
 336     int GetAlignHor() const;
 337
 338     /**
 339         Returns container's vertical alignment.
 340     */
 341     int GetAlignVer() const;
 342
 343     /**
 344         Returns the background colour of the container or @c wxNullColour if no
 345         background colour is set.
 346     */
 347     wxColour GetBackgroundColour();
 348
 349     /**
 350         Returns the indentation. @a ind is one of the @b wxHTML_INDENT_* constants.
 351
 352         @note You must call GetIndentUnits() with same @a ind parameter in order
 353               to correctly interpret the returned integer value.
 354               It is NOT always in pixels!
 355     */
 356     int GetIndent(int ind) const;
 357
 358     /**
 359         Returns the units of indentation for @a ind where @a ind is one
 360         of the @b wxHTML_INDENT_* constants.
 361     */
 362     int GetIndentUnits(int ind) const;
 363
 364     /**
 365         Inserts a new cell into the container.
 366     */
 367     void InsertCell(wxHtmlCell* cell);
 368
 369     /**
 370         Sets the container's alignment (both horizontal and vertical) according to
 371         the values stored in @e tag. (Tags @c ALIGN parameter is extracted.)
 372         In fact it is only a front-end to SetAlignHor() and SetAlignVer().
 373     */
 374     void SetAlign(const wxHtmlTag& tag);
 375
 376     /**
 377         Sets the container's @e horizontal alignment.
 378         During wxHtmlCell::Layout each line is aligned according to @a al value.
 379
 380         @param al
 381             new horizontal alignment. May be one of these values:
 382             - wxHTML_ALIGN_LEFT: lines are left-aligned (default)
 383             - wxHTML_ALIGN_JUSTIFY: lines are justified
 384             - wxHTML_ALIGN_CENTER: lines are centered
 385             - wxHTML_ALIGN_RIGHT: lines are right-aligned
 386     */
 387     void SetAlignHor(int al);
 388
 389     /**
 390         Sets the container's @e vertical alignment. This is per-line alignment!
 391
 392         @param al
 393             new vertical alignment. May be one of these values:
 394             - wxHTML_ALIGN_BOTTOM: cells are over the line (default)
 395             - wxHTML_ALIGN_CENTER: cells are centered on line
 396             - wxHTML_ALIGN_TOP: cells are under the line
 397
 398         @image html htmlcontcell_alignv.png
 399     */
 400     void SetAlignVer(int al);
 401
 402     /**
 403         Sets the background colour for this container.
 404     */
 405     void SetBackgroundColour(const wxColour& clr);
 406
 407     /**
 408         Sets the border (frame) colours. A border is a rectangle around the container.
 409
 410         @param clr1
 411             Colour of top and left lines
 412         @param clr2
 413             Colour of bottom and right lines
 414     */
 415     void SetBorder(const wxColour& clr1, const wxColour& clr2);
 416
 417     /**
 418         Sets the indentation (free space between borders of container and subcells).
 419
 420         @image html htmlcontcell_indent.png
 421
 422         @param i
 423             Indentation value.
 424         @param what
 425             Determines which of the four borders we're setting. It is OR
 426             combination of following constants:
 427             - wxHTML_INDENT_TOP: top border
 428             - wxHTML_INDENT_BOTTOM: bottom
 429             - wxHTML_INDENT_LEFT: left
 430             - wxHTML_INDENT_RIGHT: right
 431             - wxHTML_INDENT_HORIZONTAL: left and right
 432             - wxHTML_INDENT_VERTICAL: top and bottom
 433             - wxHTML_INDENT_ALL: all 4 borders
 434         @param units
 435             Units of i. This parameter affects interpretation of value.
 436             - wxHTML_UNITS_PIXELS: @a i is number of pixels
 437             - wxHTML_UNITS_PERCENT: @a i is interpreted as percents of width
 438                                     of parent container
 439     */
 440     void SetIndent(int i, int what, int units = wxHTML_UNITS_PIXELS);
 441
 442     /**
 443         Sets minimal height of the container.
 444         When container's wxHtmlCell::Layout is called, m_Height is set depending
 445         on layout of subcells to the height of area covered by layed-out subcells.
 446         Calling this method guarantees you that the height of container is never
 447         smaller than @a h - even if the subcells cover much smaller area.
 448
 449         @param h
 450             The minimal height.
 451         @param align
 452             If height of the container is lower than the minimum height, empty space
 453             must be inserted somewhere in order to ensure minimal height.
 454             This parameter is one of @c wxHTML_ALIGN_TOP, @c wxHTML_ALIGN_BOTTOM,
 455             @c wxHTML_ALIGN_CENTER. It refers to the contents, not to the
 456             empty place.
 457     */
 458     void SetMinHeight(int h, int align = wxHTML_ALIGN_TOP);
 459
 460     /**
 461         Sets floating width adjustment.
 462
 463         The normal behaviour of container is that its width is the same as the width of
 464         parent container (and thus you can have only one sub-container per line).
 465         You can change this by setting the floating width adjustment.
 466
 467         @param w
 468             Width of the container. If the value is negative it means
 469             complement to full width of parent container.
 470             E.g. @code SetWidthFloat(-50, wxHTML_UNITS_PIXELS) @endcode sets the
 471             width of container to parent's width minus 50 pixels. This is useful when
 472             creating tables - you can call SetWidthFloat(50) and SetWidthFloat(-50).
 473         @param units
 474             Units of w This parameter affects the interpretation of  value.
 475             - wxHTML_UNITS_PIXELS: @a w is number of pixels
 476             - wxHTML_UNITS_PERCENT: @a w is interpreted as percents of width
 477                                     of parent container
 478     */
 479     void SetWidthFloat(int w, int units);
 480
 481     /**
 482         Sets floating width adjustment.
 483
 484         The normal behaviour of container is that its width is the same as the width of
 485         parent container (and thus you can have only one sub-container per line).
 486         You can change this by setting the floating width adjustment.
 487
 488         @param tag
 489             In the second version of method, @a w and @a units info is extracted
 490             from tag's WIDTH parameter.
 491         @param pixel_scale
 492             This is number of real pixels that equals to 1 HTML pixel.
 493     */
 494     void SetWidthFloat(const wxHtmlTag& tag,
 495                        double pixel_scale = 1.0);
 496 };
 497
 498
 499
 500 /**
 501     @class wxHtmlLinkInfo
 502
 503     This class stores all necessary information about hypertext links
 504     (as represented by \<A\> tag in HTML documents).
 505     In current implementation it stores URL and target frame name.
 506
 507     @note Frames are not currently supported by wxHTML!
 508
 509     @library{wxhtml}
 510     @category{html}
 511 */
 512 class wxHtmlLinkInfo : public wxObject
 513 {
 514 public:
 515     /**
 516         Default ctor.
 517     */
 518     wxHtmlLinkInfo();
 519
 520     /**
 521         Construct hypertext link from HREF (aka URL) and TARGET (name of target frame).
 522     */
 523     wxHtmlLinkInfo(const wxString& href,
 524                    const wxString& target = wxEmptyString);
 525
 526     /**
 527         Return pointer to event that generated OnLinkClicked() event.
 528         Valid only within wxHtmlWindow::OnLinkClicked, @NULL otherwise.
 529     */
 530     const wxMouseEvent* GetEvent() const;
 531
 532     /**
 533         Return @e HREF value of the \<A\> tag.
 534     */
 535     wxString GetHref() const;
 536
 537     /**
 538         Return pointer to the cell that was clicked.
 539         Valid only within wxHtmlWindow::OnLinkClicked, @NULL otherwise.
 540     */
 541     const wxHtmlCell* GetHtmlCell() const;
 542
 543     /**
 544         Return @e TARGET value of the \<A\> tag (this value is used to specify
 545         in which frame should be the page pointed by @ref GetHref() Href opened).
 546     */
 547     wxString GetTarget() const;
 548 };
 549
 550 /**
 551     @class wxHtmlColourCell
 552
 553     This cell changes the colour of either the background or the foreground.
 554
 555     @library{wxhtml}
 556     @category{html}
 557 */
 558 class wxHtmlColourCell : public wxHtmlCell
 559 {
 560 public:
 561     /**
 562         Constructor.
 563
 564         @param clr
 565             The color
 566         @param flags
 567             Can be one of following:
 568             - wxHTML_CLR_FOREGROUND: change color of text
 569             - wxHTML_CLR_BACKGROUND: change background color
 570     */
 571     wxHtmlColourCell(const wxColour& clr, int flags = wxHTML_CLR_FOREGROUND);
 572 };
 573
 574
 575
 576 /**
 577     @class wxHtmlWidgetCell
 578
 579     wxHtmlWidgetCell is a class that provides a connection between HTML cells and
 580     widgets (an object derived from wxWindow).
 581     You can use it to display things like forms, input boxes etc. in an HTML window.
 582
 583     wxHtmlWidgetCell takes care of resizing and moving window.
 584
 585     @library{wxhtml}
 586     @category{html}
 587 */
 588 class wxHtmlWidgetCell : public wxHtmlCell
 589 {
 590 public:
 591     /**
 592         Constructor.
 593
 594         @param wnd
 595             Connected window. It is parent window @b must be the wxHtmlWindow object
 596             within which it is displayed!
 597         @param w
 598             Floating width. If non-zero width of wnd window is adjusted so that it is
 599             always w percents of parent container's width. (For example w = 100 means
 600             that the window will always have same width as parent container).
 601     */
 602     wxHtmlWidgetCell(wxWindow* wnd, int w = 0);
 603 };