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345
wxWidgets/include/wx/msw/dc.h
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345
wxWidgets/include/wx/msw/dc.h
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/////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/dc.h
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// Purpose: wxDC class
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// Author: Julian Smart
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// Modified by:
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// Created: 01/02/97
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// RCS-ID: $Id: dc.h 42612 2006-10-29 10:46:49Z SC $
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_MSW_DC_H_
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#define _WX_MSW_DC_H_
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#include "wx/defs.h"
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// ---------------------------------------------------------------------------
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// macros
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// ---------------------------------------------------------------------------
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#if wxUSE_DC_CACHEING
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/*
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* Cached blitting, maintaining a cache
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* of bitmaps required for transparent blitting
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* instead of constant creation/deletion
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*/
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class wxDCCacheEntry: public wxObject
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{
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public:
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wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth);
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wxDCCacheEntry(WXHDC hDC, int depth);
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virtual ~wxDCCacheEntry();
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WXHBITMAP m_bitmap;
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WXHDC m_dc;
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int m_width;
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int m_height;
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int m_depth;
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};
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#endif
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// this is an ABC: use one of the derived classes to create a DC associated
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// with a window, screen, printer and so on
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class WXDLLEXPORT wxDC : public wxDCBase
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{
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public:
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wxDC(WXHDC hDC) { Init(); m_hDC = hDC; }
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virtual ~wxDC();
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// implement base class pure virtuals
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// ----------------------------------
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virtual void Clear();
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virtual bool StartDoc(const wxString& message);
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virtual void EndDoc();
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virtual void StartPage();
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virtual void EndPage();
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virtual void SetFont(const wxFont& font);
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virtual void SetPen(const wxPen& pen);
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virtual void SetBrush(const wxBrush& brush);
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virtual void SetBackground(const wxBrush& brush);
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virtual void SetBackgroundMode(int mode);
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#if wxUSE_PALETTE
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virtual void SetPalette(const wxPalette& palette);
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#endif // wxUSE_PALETTE
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virtual void DestroyClippingRegion();
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virtual wxCoord GetCharHeight() const;
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virtual wxCoord GetCharWidth() const;
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virtual bool CanDrawBitmap() const;
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virtual bool CanGetTextExtent() const;
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virtual int GetDepth() const;
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virtual wxSize GetPPI() const;
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virtual void SetMapMode(int mode);
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virtual void SetUserScale(double x, double y);
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virtual void SetSystemScale(double x, double y);
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virtual void SetLogicalScale(double x, double y);
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virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
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virtual void SetDeviceOrigin(wxCoord x, wxCoord y);
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virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
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virtual void SetLogicalFunction(int function);
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// implementation from now on
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// --------------------------
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virtual void SetRop(WXHDC cdc);
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virtual void SelectOldObjects(WXHDC dc);
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wxWindow *GetWindow() const { return m_canvas; }
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void SetWindow(wxWindow *win)
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{
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m_canvas = win;
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#if wxUSE_PALETTE
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// if we have palettes use the correct one for this window
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InitializePalette();
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#endif // wxUSE_PALETTE
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}
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WXHDC GetHDC() const { return m_hDC; }
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void SetHDC(WXHDC dc, bool bOwnsDC = false)
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{
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m_hDC = dc;
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m_bOwnsDC = bOwnsDC;
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// we might have a pre existing clipping region, make sure that we
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// return it if asked -- but avoid calling ::GetClipBox() right now as
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// it could be unnecessary wasteful
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m_clipping = true;
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m_clipX1 =
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m_clipX2 = 0;
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}
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const wxBitmap& GetSelectedBitmap() const { return m_selectedBitmap; }
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wxBitmap& GetSelectedBitmap() { return m_selectedBitmap; }
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// update the internal clip box variables
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void UpdateClipBox();
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#if wxUSE_DC_CACHEING
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static wxDCCacheEntry* FindBitmapInCache(WXHDC hDC, int w, int h);
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static wxDCCacheEntry* FindDCInCache(wxDCCacheEntry* notThis, WXHDC hDC);
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static void AddToBitmapCache(wxDCCacheEntry* entry);
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static void AddToDCCache(wxDCCacheEntry* entry);
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static void ClearCache();
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#endif
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// RTL related functions
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// ---------------------
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// get or change the layout direction (LTR or RTL) for this dc,
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// wxLayout_Default is returned if layout direction is not supported
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virtual wxLayoutDirection GetLayoutDirection() const;
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virtual void SetLayoutDirection(wxLayoutDirection dir);
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protected:
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void Init()
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{
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m_canvas = NULL;
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m_bOwnsDC = false;
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m_hDC = NULL;
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m_oldBitmap = NULL;
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m_oldPen = NULL;
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m_oldBrush = NULL;
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m_oldFont = NULL;
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#if wxUSE_PALETTE
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m_oldPalette = NULL;
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#endif // wxUSE_PALETTE
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}
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// create an uninitialized DC: this should be only used by the derived
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// classes
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wxDC() { Init(); }
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virtual void DoGetTextExtent(const wxString& string,
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wxCoord *x, wxCoord *y,
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wxCoord *descent = NULL,
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wxCoord *externalLeading = NULL,
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wxFont *theFont = NULL) const;
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virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
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virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
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int style = wxFLOOD_SURFACE);
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virtual void DoGradientFillLinear(const wxRect& rect,
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const wxColour& initialColour,
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const wxColour& destColour,
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wxDirection nDirection = wxEAST);
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virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
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virtual void DoDrawPoint(wxCoord x, wxCoord y);
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virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
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virtual void DoDrawArc(wxCoord x1, wxCoord y1,
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wxCoord x2, wxCoord y2,
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wxCoord xc, wxCoord yc);
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virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
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wxCoord width, wxCoord height);
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virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
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double sa, double ea);
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virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
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virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
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wxCoord width, wxCoord height,
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double radius);
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virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
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#if wxUSE_SPLINES
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virtual void DoDrawSpline(wxList *points);
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#endif
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virtual void DoCrossHair(wxCoord x, wxCoord y);
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virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
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virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
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bool useMask = false);
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virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
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virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
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double angle);
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virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
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wxDC *source, wxCoord xsrc, wxCoord ysrc,
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int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord);
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// this is gnarly - we can't even call this function DoSetClippingRegion()
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// because of virtual function hiding
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virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
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virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
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wxCoord width, wxCoord height);
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virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
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wxCoord *w, wxCoord *h) const;
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virtual void DoGetSizeMM(int* width, int* height) const;
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virtual void DoDrawLines(int n, wxPoint points[],
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wxCoord xoffset, wxCoord yoffset);
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virtual void DoDrawPolygon(int n, wxPoint points[],
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wxCoord xoffset, wxCoord yoffset,
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int fillStyle = wxODDEVEN_RULE);
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virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
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wxCoord xoffset, wxCoord yoffset,
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int fillStyle = wxODDEVEN_RULE);
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virtual wxBitmap DoGetAsBitmap(const wxRect *subrect) const
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{ return subrect == NULL ? GetSelectedBitmap() : GetSelectedBitmap().GetSubBitmap(*subrect); }
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#if wxUSE_PALETTE
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// MSW specific, select a logical palette into the HDC
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// (tell windows to translate pixel from other palettes to our custom one
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// and vice versa)
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// Realize tells it to also reset the system palette to this one.
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void DoSelectPalette(bool realize = false);
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// Find out what palette our parent window has, then select it into the dc
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void InitializePalette();
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#endif // wxUSE_PALETTE
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// common part of DoDrawText() and DoDrawRotatedText()
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void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
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// common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
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void SetClippingHrgn(WXHRGN hrgn);
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// implementation of DoGetSize() for wxScreen/PrinterDC: this simply
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// returns the size of the entire device this DC is associated with
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//
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// notice that we intentionally put it in a separate function instead of
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// DoGetSize() itself because we want it to remain pure virtual both
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// because each derived class should take care to define it as needed (this
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// implementation is not at all always appropriate) and because we want
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// wxDC to be an ABC to prevent it from being created directly
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void GetDeviceSize(int *width, int *height) const;
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// MSW-specific member variables
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// -----------------------------
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// the window associated with this DC (may be NULL)
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wxWindow *m_canvas;
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wxBitmap m_selectedBitmap;
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// TRUE => DeleteDC() in dtor, FALSE => only ReleaseDC() it
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bool m_bOwnsDC:1;
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// our HDC
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WXHDC m_hDC;
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// Store all old GDI objects when do a SelectObject, so we can select them
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// back in (this unselecting user's objects) so we can safely delete the
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// DC.
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WXHBITMAP m_oldBitmap;
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WXHPEN m_oldPen;
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WXHBRUSH m_oldBrush;
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WXHFONT m_oldFont;
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#if wxUSE_PALETTE
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WXHPALETTE m_oldPalette;
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#endif // wxUSE_PALETTE
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#if wxUSE_DC_CACHEING
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static wxList sm_bitmapCache;
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static wxList sm_dcCache;
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#endif
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DECLARE_DYNAMIC_CLASS(wxDC)
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DECLARE_NO_COPY_CLASS(wxDC)
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};
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// ----------------------------------------------------------------------------
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// wxDCTemp: a wxDC which doesn't free the given HDC (used by wxWidgets
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// only/mainly)
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxDCTemp : public wxDC
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{
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public:
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// construct a temporary DC with the specified HDC and size (it should be
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// specified whenever we know it for this HDC)
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wxDCTemp(WXHDC hdc, const wxSize& size = wxDefaultSize)
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: wxDC(hdc),
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m_size(size)
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{
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}
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virtual ~wxDCTemp()
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{
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// prevent base class dtor from freeing it
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SetHDC((WXHDC)NULL);
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}
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protected:
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virtual void DoGetSize(int *w, int *h) const
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{
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wxASSERT_MSG( m_size.IsFullySpecified(),
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_T("size of this DC hadn't been set and is unknown") );
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if ( w )
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*w = m_size.x;
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if ( h )
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*h = m_size.y;
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}
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private:
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// size of this DC must be explicitly set by SetSize() as we have no way to
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// find it ourselves
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const wxSize m_size;
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DECLARE_NO_COPY_CLASS(wxDCTemp)
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};
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#endif // _WX_MSW_DC_H_
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