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/////////////////////////////////////////////////////////////////////////////
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// Name: html/htmlcell.h
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// Purpose: interface of wxHtml*Cell
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// Author: wxWidgets team
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// RCS-ID: $Id: htmlcell.h 70528 2012-02-07 13:02:32Z VZ $
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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@class wxHtmlRenderingStyle
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Allows HTML rendering customizations.
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This class is used when rendering wxHtmlCells as a callback.
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@see wxHtmlRenderingInfo
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class wxHtmlRenderingStyle
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Returns the colour to use for the selected text.
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virtual wxColour GetSelectedTextColour(const wxColour& clr) = 0;
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Returns the colour to use for the selected text's background.
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virtual wxColour GetSelectedTextBgColour(const wxColour& clr) = 0;
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@class wxHtmlRenderingInfo
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This class contains information given to cells when drawing them.
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Contains rendering state, selection information and rendering style object
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that can be used to customize the output.
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@see @ref overview_html_cells, wxHtmlCell
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class wxHtmlRenderingInfo
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wxHtmlRenderingInfo();
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void SetSelection(wxHtmlSelection *s);
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wxHtmlSelection *GetSelection() const;
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void SetStyle(wxHtmlRenderingStyle *style);
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wxHtmlRenderingStyle& GetStyle();
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wxHtmlRenderingState& GetState();
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Internal data structure. It represents fragments of parsed HTML page, the
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so-called @b cell - a word, picture, table, horizontal line and so on.
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It is used by wxHtmlWindow and wxHtmlWinParser to represent HTML page in memory.
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You can divide cells into two groups : @e visible cells with non-zero width and
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height and @e helper cells (usually with zero width and height) that perform
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special actions such as color or font change.
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@see @ref overview_html_cells, wxHtmlContainerCell
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class wxHtmlCell : public wxObject
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This method is used to adjust pagebreak position.
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The first parameter is a variable that contains the y-coordinate of the page break
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(= horizontal line that should not be crossed by words, images etc.).
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If this cell cannot be divided into two pieces (each one on another page)
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then it either moves the pagebreak a few pixels up, if possible, or, if
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the cell cannot fit on the page at all, then the cell is forced to
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split unconditionally.
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Returns @true if pagebreak was modified, @false otherwise.
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position in pixel of the pagebreak.
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@param known_pagebreaks
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the list of the previous pagebreaks
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the height in pixel of the page drawable area
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while (container->AdjustPagebreak(&p, kp, ph)) {}
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virtual bool AdjustPagebreak(int* pagebreak,
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const wxArrayInt& known_pagebreaks,
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int pageHeight) const;
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Device context to which the cell is to be drawn.
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Coordinates of parent's upper left corner (origin). You must
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add this to m_PosX,m_PosY when passing coordinates to dc's methods
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dc->DrawText("hello", x + m_PosX, y + m_PosY)
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y-coord of the first line visible in window.
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This is used to optimize rendering speed.
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y-coord of the last line visible in window.
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This is used to optimize rendering speed.
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Additional information for the rendering of the cell.
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virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2, wxHtmlRenderingInfo& info);
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This method is called instead of Draw() when the cell is certainly out of
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the screen (and thus invisible). This is not nonsense - some tags (like
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wxHtmlColourCell or font setter) must be drawn even if they are invisible!
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Device context to which the cell is to be drawn.
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Coordinates of parent's upper left corner. You must
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add this to m_PosX,m_PosY when passing coordinates to dc's methods
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dc->DrawText("hello", x + m_PosX, y + m_PosY)
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Additional information for the rendering of the cell.
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virtual void DrawInvisible(wxDC& dc, int x , int y, wxHtmlRenderingInfo& info);
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Returns pointer to itself if this cell matches condition (or if any of the
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cells following in the list matches), @NULL otherwise.
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(In other words if you call top-level container's Find() it will
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return pointer to the first cell that matches the condition)
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It is recommended way how to obtain pointer to particular cell or
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to cell of some type (e.g. wxHtmlAnchorCell reacts on wxHTML_COND_ISANCHOR
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Unique integer identifier of condition
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virtual const wxHtmlCell* Find(int condition, const void* param) const;
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Returns descent value of the cell (m_Descent member).
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@image html htmlcell_descent.png
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int GetDescent() const;
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Returns pointer to the first cell in the list.
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You can then use child's GetNext() method to obtain pointer to the next
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@note This shouldn't be used by the end user. If you need some way of
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finding particular cell in the list, try Find() method instead.
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virtual wxHtmlCell* GetFirstChild() const;
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Returns height of the cell (m_Height member).
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int GetHeight() const;
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Returns unique cell identifier if there is any, the empty string otherwise.
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const wxString& GetId() const;
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Returns hypertext link if associated with this cell or @NULL otherwise.
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See wxHtmlLinkInfo. (Note: this makes sense only for visible tags).
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Coordinates of position where the user pressed mouse button.
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These coordinates are used e.g. by COLORMAP. Values are relative to the
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upper left corner of THIS cell (i.e. from 0 to m_Width or m_Height)
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virtual wxHtmlLinkInfo* GetLink(int x = 0, int y = 0) const;
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Returns cursor to show when mouse pointer is over the cell.
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interface to the parent HTML window
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virtual wxCursor GetMouseCursor(wxHtmlWindowInterface* window) const;
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Returns pointer to the next cell in list (see htmlcell.h if you're
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interested in details).
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wxHtmlCell* GetNext() const;
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Returns pointer to parent container.
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wxHtmlContainerCell* GetParent() const;
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Returns X position within parent (the value is relative to parent's
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upper left corner). The returned value is meaningful only if
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parent's Layout() was called before!
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Returns Y position within parent (the value is relative to parent's
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upper left corner). The returned value is meaningful only if
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parent's Layout() was called before!
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Returns width of the cell (m_Width member).
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int GetWidth() const;
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This method performs two actions:
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-# adjusts the cell's width according to the fact that maximal possible
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width is @e w (this has sense when working with horizontal lines, tables etc.)
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-# prepares layout (=fill-in m_PosX, m_PosY (and sometimes m_Height) members)
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based on actual width @e w
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It must be called before displaying cells structure because m_PosX and
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m_PosY are undefined (or invalid) before calling Layout().
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virtual void Layout(int w);
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This function is simple event handler.
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Each time the user clicks mouse button over a cell within wxHtmlWindow
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this method of that cell is called.
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Default behaviour is to call wxHtmlWindow::LoadPage.
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interface to the parent HTML window
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coordinates of mouse click (this is relative to cell's origin
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mouse event that triggered the call
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@return @true if a link was clicked, @false otherwise.
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@since 2.7.0 (before OnMouseClick() method served a similar purpose).
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If you need more "advanced" event handling you should use wxHtmlBinderCell instead.
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virtual bool ProcessMouseClick(wxHtmlWindowInterface* window,
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const wxMouseEvent& event);
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Sets unique cell identifier. Default value is no identifier, i.e. empty string.
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void SetId(const wxString& id);
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Sets the hypertext link associated with this cell.
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(Default value is wxHtmlLinkInfo("", "") (no link))
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void SetLink(const wxHtmlLinkInfo& link);
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Sets the next cell in the list. This shouldn't be called by user - it is
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to be used only by wxHtmlContainerCell::InsertCell.
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void SetNext(wxHtmlCell* cell);
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Sets parent container of this cell.
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This is called from wxHtmlContainerCell::InsertCell.
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void SetParent(wxHtmlContainerCell* p);
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Sets the cell's position within parent container.
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virtual void SetPos(int x, int y);
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@class wxHtmlContainerCell
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The wxHtmlContainerCell class is an implementation of a cell that may
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contain more cells in it. It is heavily used in the wxHTML layout algorithm.
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@see @ref overview_html_cells
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class wxHtmlContainerCell : public wxHtmlCell
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Constructor. @a parent is pointer to parent container or @NULL.
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wxHtmlContainerCell(wxHtmlContainerCell* parent);
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Returns container's horizontal alignment.
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int GetAlignHor() const;
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Returns container's vertical alignment.
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int GetAlignVer() const;
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Returns the background colour of the container or @c wxNullColour if no
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background colour is set.
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wxColour GetBackgroundColour();
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Returns the indentation. @a ind is one of the @b wxHTML_INDENT_* constants.
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@note You must call GetIndentUnits() with same @a ind parameter in order
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to correctly interpret the returned integer value.
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It is NOT always in pixels!
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int GetIndent(int ind) const;
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Returns the units of indentation for @a ind where @a ind is one
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of the @b wxHTML_INDENT_* constants.
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int GetIndentUnits(int ind) const;
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Inserts a new cell into the container.
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void InsertCell(wxHtmlCell* cell);
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Sets the container's alignment (both horizontal and vertical) according to
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the values stored in @e tag. (Tags @c ALIGN parameter is extracted.)
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In fact it is only a front-end to SetAlignHor() and SetAlignVer().
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void SetAlign(const wxHtmlTag& tag);
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Sets the container's @e horizontal alignment.
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During wxHtmlCell::Layout each line is aligned according to @a al value.
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new horizontal alignment. May be one of these values:
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- wxHTML_ALIGN_LEFT: lines are left-aligned (default)
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- wxHTML_ALIGN_JUSTIFY: lines are justified
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- wxHTML_ALIGN_CENTER: lines are centered
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- wxHTML_ALIGN_RIGHT: lines are right-aligned
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void SetAlignHor(int al);
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Sets the container's @e vertical alignment. This is per-line alignment!
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new vertical alignment. May be one of these values:
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- wxHTML_ALIGN_BOTTOM: cells are over the line (default)
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- wxHTML_ALIGN_CENTER: cells are centered on line
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- wxHTML_ALIGN_TOP: cells are under the line
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@image html htmlcontcell_alignv.png
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void SetAlignVer(int al);
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Sets the background colour for this container.
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void SetBackgroundColour(const wxColour& clr);
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Sets the border (frame) colours. A border is a rectangle around the container.
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Colour of top and left lines
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Colour of bottom and right lines
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Size of the border in pixels
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void SetBorder(const wxColour& clr1, const wxColour& clr2, int border = 1);
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Sets the indentation (free space between borders of container and subcells).
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@image html htmlcontcell_indent.png
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Determines which of the four borders we're setting. It is OR
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combination of following constants:
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- wxHTML_INDENT_TOP: top border
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- wxHTML_INDENT_BOTTOM: bottom
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- wxHTML_INDENT_LEFT: left
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- wxHTML_INDENT_RIGHT: right
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- wxHTML_INDENT_HORIZONTAL: left and right
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- wxHTML_INDENT_VERTICAL: top and bottom
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- wxHTML_INDENT_ALL: all 4 borders
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Units of i. This parameter affects interpretation of value.
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- wxHTML_UNITS_PIXELS: @a i is number of pixels
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- wxHTML_UNITS_PERCENT: @a i is interpreted as percents of width
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void SetIndent(int i, int what, int units = wxHTML_UNITS_PIXELS);
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Sets minimal height of the container.
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When container's wxHtmlCell::Layout is called, m_Height is set depending
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on layout of subcells to the height of area covered by layed-out subcells.
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Calling this method guarantees you that the height of container is never
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smaller than @a h - even if the subcells cover much smaller area.
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If height of the container is lower than the minimum height, empty space
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must be inserted somewhere in order to ensure minimal height.
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This parameter is one of @c wxHTML_ALIGN_TOP, @c wxHTML_ALIGN_BOTTOM,
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@c wxHTML_ALIGN_CENTER. It refers to the contents, not to the
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void SetMinHeight(int h, int align = wxHTML_ALIGN_TOP);
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Sets floating width adjustment.
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The normal behaviour of container is that its width is the same as the width of
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parent container (and thus you can have only one sub-container per line).
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You can change this by setting the floating width adjustment.
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Width of the container. If the value is negative it means
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complement to full width of parent container.
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E.g. @code SetWidthFloat(-50, wxHTML_UNITS_PIXELS) @endcode sets the
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width of container to parent's width minus 50 pixels. This is useful when
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creating tables - you can call SetWidthFloat(50) and SetWidthFloat(-50).
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Units of w This parameter affects the interpretation of value.
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- wxHTML_UNITS_PIXELS: @a w is number of pixels
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- wxHTML_UNITS_PERCENT: @a w is interpreted as percents of width
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void SetWidthFloat(int w, int units);
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Sets floating width adjustment.
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The normal behaviour of container is that its width is the same as the width of
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parent container (and thus you can have only one sub-container per line).
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You can change this by setting the floating width adjustment.
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In the second version of method, @a w and @a units info is extracted
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from tag's WIDTH parameter.
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This is number of real pixels that equals to 1 HTML pixel.
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void SetWidthFloat(const wxHtmlTag& tag,
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double pixel_scale = 1.0);
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@class wxHtmlLinkInfo
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This class stores all necessary information about hypertext links
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(as represented by \<A\> tag in HTML documents).
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In current implementation it stores URL and target frame name.
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@note Frames are not currently supported by wxHTML!
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class wxHtmlLinkInfo : public wxObject
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Construct hypertext link from HREF (aka URL) and TARGET (name of target frame).
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wxHtmlLinkInfo(const wxString& href,
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const wxString& target = wxEmptyString);
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Return pointer to event that generated OnLinkClicked() event.
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Valid only within wxHtmlWindow::OnLinkClicked, @NULL otherwise.
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const wxMouseEvent* GetEvent() const;
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Return @e HREF value of the \<A\> tag.
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wxString GetHref() const;
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Return pointer to the cell that was clicked.
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Valid only within wxHtmlWindow::OnLinkClicked, @NULL otherwise.
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const wxHtmlCell* GetHtmlCell() const;
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Return @e TARGET value of the \<A\> tag (this value is used to specify
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in which frame should be the page pointed by @ref GetHref() Href opened).
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wxString GetTarget() const;
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@class wxHtmlColourCell
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This cell changes the colour of either the background or the foreground.
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class wxHtmlColourCell : public wxHtmlCell
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Can be one of following:
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- wxHTML_CLR_FOREGROUND: change color of text
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- wxHTML_CLR_BACKGROUND: change background color
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wxHtmlColourCell(const wxColour& clr, int flags = wxHTML_CLR_FOREGROUND);
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@class wxHtmlWidgetCell
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wxHtmlWidgetCell is a class that provides a connection between HTML cells and
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widgets (an object derived from wxWindow).
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You can use it to display things like forms, input boxes etc. in an HTML window.
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wxHtmlWidgetCell takes care of resizing and moving window.
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class wxHtmlWidgetCell : public wxHtmlCell
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Connected window. It is parent window @b must be the wxHtmlWindow object
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within which it is displayed!
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Floating width. If non-zero width of wnd window is adjusted so that it is
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always w percents of parent container's width. (For example w = 100 means
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that the window will always have same width as parent container).
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wxHtmlWidgetCell(wxWindow* wnd, int w = 0);