htmlcell.h

浙江大学的悟空嵌入式系统模拟器

/////////////////////////////////////////////////////////////////////////////
// Name:        htmlcell.h
// Purpose:     wxHtmlCell class is used by wxHtmlWindow/wxHtmlWinParser
//              as a basic visual element of HTML page
// Author:      Vaclav Slavik
// RCS-ID:      $Id: htmlcell.h,v 1.1 2005/03/16 06:49:43 kehc Exp $
// Copyright:   (c) 1999 Vaclav Slavik
// Licence:     wxWindows Licence
/////////////////////////////////////////////////////////////////////////////


#ifndef _WX_HTMLCELL_H_
#define _WX_HTMLCELL_H_

#if defined(__GNUG__) && !defined(__APPLE__)
#pragma interface "htmlcell.h"
#endif

#include "wx/defs.h"

#if wxUSE_HTML

#include "wx/html/htmltag.h"
#include "wx/html/htmldefs.h"
#include "wx/window.h"


class WXDLLEXPORT wxHtmlLinkInfo;
class WXDLLEXPORT wxHtmlCell;
class WXDLLEXPORT wxHtmlContainerCell;

// Temporary kludge for backporting html pagebreaks to 2.4.0;
// Do not use, this will NOT be part of wx 2.5!
struct WXDLLEXPORT wxHtmlKludge
{
    int pbreak;
    int *known_pagebreaks;
    int number_of_pages;
};

//--------------------------------------------------------------------------------
// wxHtmlCell
//                  Internal data structure. It represents fragments of parsed HTML
//                  page - a word, picture, table, horizontal line and so on.
//                  It is used by wxHtmlWindow to represent HTML page in memory.
//--------------------------------------------------------------------------------


class WXDLLEXPORT wxHtmlCell : public wxObject
{
public:
    wxHtmlCell();
    virtual ~wxHtmlCell();

    void SetParent(wxHtmlContainerCell *p) {m_Parent = p;}
    wxHtmlContainerCell *GetParent() const {return m_Parent;}

    int GetPosX() const {return m_PosX;}
    int GetPosY() const {return m_PosY;}
    int GetWidth() const {return m_Width;}
    int GetHeight() const {return m_Height;}
    int GetDescent() const {return m_Descent;}

    const wxString& GetId() const { return m_id; }
    void SetId(const wxString& id) { m_id = id; }

    // returns the link associated with this cell. The position is position within
    // the cell so it varies from 0 to m_Width, from 0 to m_Height
    virtual wxHtmlLinkInfo* GetLink(int WXUNUSED(x) = 0, int WXUNUSED(y) = 0) const
        { return m_Link; }

    // members access methods
    wxHtmlCell *GetNext() const {return m_Next;}

    // members writing methods
    virtual void SetPos(int x, int y) {m_PosX = x, m_PosY = y;}
    void SetLink(const wxHtmlLinkInfo& link);
    void SetNext(wxHtmlCell *cell) {m_Next = cell;}

    // 1. adjust cell's width according to the fact that maximal possible width is w.
    //    (this has sense when working with horizontal lines, tables etc.)
    // 2. prepare layout (=fill-in m_PosX, m_PosY (and sometime m_Height) members)
    //    = place items to fit window, according to the width w
    virtual void Layout(int w);

    // renders the cell
    virtual void Draw(wxDC& WXUNUSED(dc), int WXUNUSED(x), int WXUNUSED(y), int WXUNUSED(view_y1), int WXUNUSED(view_y2)) {}

    // proceed drawing actions in case the cell is not visible (scrolled out of screen).
    // This is needed to change fonts, colors and so on
    virtual void DrawInvisible(wxDC& WXUNUSED(dc), int WXUNUSED(x), int WXUNUSED(y)) {}

    // This method returns pointer to the FIRST cell for that
    // the condition
    // is true. It first checks if the condition is true for this
    // cell and then calls m_Next->Find(). (Note: it checks
    // all subcells if the cell is container)
    // Condition is unique condition identifier (see htmldefs.h)
    // (user-defined condition IDs should start from 10000)
    // and param is optional parameter
    // Example : m_Cell->Find(wxHTML_COND_ISANCHOR, "news");
    //   returns pointer to anchor news
    virtual const wxHtmlCell* Find(int condition, const void* param) const;

    // This function is called when mouse button is clicked over the cell.
    //
    // Parent is pointer to wxHtmlWindow that generated the event
    // HINT: if this handling is not enough for you you should use
    //       wxHtmlWidgetCell
    virtual void OnMouseClick(wxWindow *parent, int x, int y, const wxMouseEvent& event);

    // This method used to adjust pagebreak position. The parameter is
    // variable that contains y-coordinate of page break (= horizontal line that
    // should not be crossed by words, images etc.). If this cell cannot be divided
    // into two pieces (each one on another page) then it moves the pagebreak
    // few pixels up.
    //
    // Returned value : true if pagebreak was modified, false otherwise
    // Usage : while (container->AdjustPagebreak(&p)) {}
    virtual bool AdjustPagebreak(int *pagebreak) const;
// wx 2.5 will use this signature:
//  virtual bool AdjustPagebreak(int *pagebreak, int *known_pagebreaks = NULL, int number_of_pages = 0) const;

    // Sets cell's behaviour on pagebreaks (see AdjustPagebreak). Default
    // is true - the cell can be split on two pages
    void SetCanLiveOnPagebreak(bool can) { m_CanLiveOnPagebreak = can; }

    // Returns y-coordinates that contraint the cell, i.e. left is highest
    // and right lowest coordinate such that the cell lays between then.
    // Note: this method does not return meaningful values if you haven't
    //       called Layout() before!
    virtual void GetHorizontalConstraints(int *left, int *right) const;

    // Returns true for simple == terminal cells, i.e. not composite ones.
    // This if for internal usage only and may disappear in future versions!
    virtual bool IsTerminalCell() const { return TRUE; }

    // Find the terminal cell inside this cell at the given position (relative
    // to this cell)
    //
    // Returns NULL if not found
    virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y) const;

protected:
    wxHtmlCell *m_Next;
            // pointer to the next cell
    wxHtmlContainerCell *m_Parent;
            // pointer to parent cell
    long m_Width, m_Height, m_Descent;
            // dimensions of fragment
            // m_Descent is used to position text&images..
    long m_PosX, m_PosY;
            // position where the fragment is drawn
    wxHtmlLinkInfo *m_Link;
            // destination address if this fragment is hypertext link, NULL otherwise
    bool m_CanLiveOnPagebreak;
            // true if this cell can be placed on pagebreak, false otherwise
    wxString m_id;
            // unique identifier of the cell, generated from "id" property of tags
};




//--------------------------------------------------------------------------------
// Inherited cells:
//--------------------------------------------------------------------------------


//--------------------------------------------------------------------------------
// wxHtmlWordCell
//                  Single word in input stream.
//--------------------------------------------------------------------------------

class WXDLLEXPORT wxHtmlWordCell : public wxHtmlCell
{
public:
    wxHtmlWordCell(const wxString& word, wxDC& dc);
    void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);

protected:
    wxString m_Word;
};





//--------------------------------------------------------------------------------
// wxHtmlContainerCell
//                  Container - it contains other cells. Basic of layout algorithm.
//--------------------------------------------------------------------------------

class WXDLLEXPORT wxHtmlContainerCell : public wxHtmlCell
{