/////////////////////////////////////////////////////////////////////////////
-// Name: dc.h
+// Name: wx/msw/dc.h
// Purpose: wxDC class
// Author: Julian Smart
// Modified by:
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifndef _WX_DC_H_
-#define _WX_DC_H_
-
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
- #pragma interface "dc.h"
-#endif
+#ifndef _WX_MSW_DC_H_
+#define _WX_MSW_DC_H_
#include "wx/defs.h"
public:
wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth);
wxDCCacheEntry(WXHDC hDC, int depth);
- ~wxDCCacheEntry();
+ virtual ~wxDCCacheEntry();
WXHBITMAP m_bitmap;
WXHDC m_dc;
};
#endif
+// this is an ABC: use one of the derived classes to create a DC associated
+// with a window, screen, printer and so on
class WXDLLEXPORT wxDC : public wxDCBase
{
public:
- wxDC();
- ~wxDC();
+ wxDC(WXHDC hDC) { Init(); m_hDC = hDC; }
+ virtual ~wxDC();
// implement base class pure virtuals
// ----------------------------------
virtual wxCoord GetCharHeight() const;
virtual wxCoord GetCharWidth() const;
- virtual void DoGetTextExtent(const wxString& string,
- wxCoord *x, wxCoord *y,
- wxCoord *descent = NULL,
- wxCoord *externalLeading = NULL,
- wxFont *theFont = NULL) const;
- virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
virtual bool CanDrawBitmap() const;
virtual bool CanGetTextExtent() const;
static void ClearCache();
#endif
+ // RTL related functions
+ // ---------------------
+
+ // get or change the layout direction (LTR or RTL) for this dc,
+ // wxLayout_Default is returned if layout direction is not supported
+ virtual wxLayoutDirection GetLayoutDirection() const;
+ virtual void SetLayoutDirection(wxLayoutDirection dir);
+
protected:
+ void Init()
+ {
+ m_canvas = NULL;
+ m_bOwnsDC = false;
+ m_hDC = NULL;
+
+ m_oldBitmap = NULL;
+ m_oldPen = NULL;
+ m_oldBrush = NULL;
+ m_oldFont = NULL;
+
+#if wxUSE_PALETTE
+ m_oldPalette = NULL;
+#endif // wxUSE_PALETTE
+ }
+
+ // create an uninitialized DC: this should be only used by the derived
+ // classes
+ wxDC() { Init(); }
+
+ virtual void DoGetTextExtent(const wxString& string,
+ wxCoord *x, wxCoord *y,
+ wxCoord *descent = NULL,
+ wxCoord *externalLeading = NULL,
+ wxFont *theFont = NULL) const;
+ virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
+
virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
int style = wxFLOOD_SURFACE);
+ virtual void DoGradientFillLinear(const wxRect& rect,
+ const wxColour& initialColour,
+ const wxColour& destColour,
+ wxDirection nDirection = wxEAST);
+
virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
virtual void DoDrawPoint(wxCoord x, wxCoord y);
double radius);
virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+#if wxUSE_SPLINES
+ virtual void DoDrawSpline(wxList *points);
+#endif
+
virtual void DoCrossHair(wxCoord x, wxCoord y);
virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
wxCoord *w, wxCoord *h) const;
- virtual void DoGetSize(int *width, int *height) const;
virtual void DoGetSizeMM(int* width, int* height) const;
virtual void DoDrawLines(int n, wxPoint points[],
virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
wxCoord xoffset, wxCoord yoffset,
int fillStyle = wxODDEVEN_RULE);
+ virtual wxBitmap DoGetAsBitmap(const wxRect *subrect) const
+ { return subrect == NULL ? GetSelectedBitmap() : GetSelectedBitmap().GetSubBitmap(*subrect); }
#if wxUSE_PALETTE
// common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
void SetClippingHrgn(WXHRGN hrgn);
+ // implementation of DoGetSize() for wxScreen/PrinterDC: this simply
+ // returns the size of the entire device this DC is associated with
+ //
+ // notice that we intentionally put it in a separate function instead of
+ // DoGetSize() itself because we want it to remain pure virtual both
+ // because each derived class should take care to define it as needed (this
+ // implementation is not at all always appropriate) and because we want
+ // wxDC to be an ABC to prevent it from being created directly
+ void GetDeviceSize(int *width, int *height) const;
+
+
// MSW-specific member variables
// -----------------------------
class WXDLLEXPORT wxDCTemp : public wxDC
{
public:
- wxDCTemp(WXHDC hdc) { SetHDC(hdc); }
- virtual ~wxDCTemp() { SetHDC((WXHDC)NULL); }
+ // construct a temporary DC with the specified HDC and size (it should be
+ // specified whenever we know it for this HDC)
+ wxDCTemp(WXHDC hdc, const wxSize& size = wxDefaultSize)
+ : wxDC(hdc),
+ m_size(size)
+ {
+ }
+
+ virtual ~wxDCTemp()
+ {
+ // prevent base class dtor from freeing it
+ SetHDC((WXHDC)NULL);
+ }
+
+protected:
+ virtual void DoGetSize(int *w, int *h) const
+ {
+ wxASSERT_MSG( m_size.IsFullySpecified(),
+ _T("size of this DC hadn't been set and is unknown") );
+
+ if ( w )
+ *w = m_size.x;
+ if ( h )
+ *h = m_size.y;
+ }
private:
+ // size of this DC must be explicitly set by SetSize() as we have no way to
+ // find it ourselves
+ const wxSize m_size;
+
DECLARE_NO_COPY_CLASS(wxDCTemp)
};
-#endif
- // _WX_DC_H_
+#endif // _WX_MSW_DC_H_
+
projects / wxWidgets.git / blobdiff