Don't return a dangling pointer from wxDateTime::ParseXXX(wxCStrData).

[wxWidgets.git] / include / wx / dc.h

diff --git a/include/wx/dc.h b/include/wx/dc.h
index 4981bda64adbe6e15d105183db90e4650a78abe4..b519785afa63fcede71bc88eab1f84e55c7df09f 100644 (file)
--- a/include/wx/dc.h
+++ b/include/wx/dc.h
@@ -29,7 +29,8 @@
 #include "wx/dynarray.h"
 #include "wx/math.h"
 #include "wx/image.h"
-#include "wx/cmndata.h"
+#include "wx/region.h"
+#include "wx/affinematrix2d.h"
 
 #define wxUSE_NEW_DC 1
 
@@ -42,6 +43,10 @@ class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
 class WXDLLIMPEXP_FWD_CORE wxPrintData;
 
+#if wxUSE_GRAPHICS_CONTEXT
+class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
+#endif
+
 //  Logical ops
 enum wxRasterOperationMode
 {
@@ -114,6 +119,27 @@ enum wxMappingMode
     wxMM_POINTS
 };
 
+// Description of text characteristics.
+struct wxFontMetrics
+{
+    wxFontMetrics()
+    {
+        height =
+        ascent =
+        descent =
+        internalLeading =
+        externalLeading =
+        averageWidth = 0;
+    }
+
+    int height,             // Total character height.
+        ascent,             // Part of the height above the baseline.
+        descent,            // Part of the height below the baseline.
+        internalLeading,    // Intra-line spacing.
+        externalLeading,    // Inter-line spacing.
+        averageWidth;       // Average font width, a.k.a. "x-width".
+};
+
 #if WXWIN_COMPATIBILITY_2_8
 
 //-----------------------------------------------------------------------------
@@ -375,6 +401,18 @@ public:
 
     virtual wxCoord GetCharHeight() const = 0;
     virtual wxCoord GetCharWidth() const = 0;
+
+    // The derived classes should really override DoGetFontMetrics() to return
+    // the correct values in the future but for now provide a default
+    // implementation in terms of DoGetTextExtent() to avoid breaking the
+    // compilation of all other ports as wxMSW is the only one to implement it.
+    virtual void DoGetFontMetrics(int *height,
+                                  int *ascent,
+                                  int *descent,
+                                  int *internalLeading,
+                                  int *externalLeading,
+                                  int *averageWidth) const;
+
     virtual void DoGetTextExtent(const wxString& string,
                                  wxCoord *x, wxCoord *y,
                                  wxCoord *descent = NULL,
@@ -437,7 +475,7 @@ public:
     }
 
     virtual void SetLogicalScale(double x, double y);
-    virtual void GetLogicalScale(double *x, double *y)
+    virtual void GetLogicalScale(double *x, double *y) const
     {
         if ( x ) *x = m_logicalScaleX;
         if ( y ) *y = m_logicalScaleY;
@@ -457,6 +495,20 @@ public:
         if ( y ) *y = m_deviceOriginY;
     }
 
+#if wxUSE_DC_TRANSFORM_MATRIX
+    // Transform matrix support is not available in most ports right now
+    // (currently only wxMSW provides it) so do nothing in these methods by
+    // default.
+    virtual bool CanUseTransformMatrix() const
+        { return false; }
+    virtual bool SetTransformMatrix(const wxAffineMatrix2D& WXUNUSED(matrix))
+        { return false; }
+    virtual wxAffineMatrix2D GetTransformMatrix() const
+        { return wxAffineMatrix2D(); }
+    virtual void ResetTransformMatrix()
+        { }
+#endif // wxUSE_DC_TRANSFORM_MATRIX
+
     virtual void SetDeviceLocalOrigin( wxCoord x, wxCoord y );
 
     virtual void ComputeScaleAndOrigin();
@@ -464,6 +516,19 @@ public:
     // this needs to overidden if the axis is inverted
     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
 
+#ifdef __WXMSW__
+    // Native Windows functions using the underlying HDC don't honour GDI+
+    // transformations which may be applied to it. Using this function we can
+    // transform the coordinates manually before passing them to such functions
+    // (as in e.g. wxRendererMSW code). It doesn't do anything if this is not a
+    // wxGCDC.
+    virtual wxRect MSWApplyGDIPlusTransform(const wxRect& r) const
+    {
+        return r;
+    }
+#endif // __WXMSW__
+
+
     // ---------------------------------------------------------
     // the actual drawing API
 
@@ -579,6 +644,13 @@ public:
     virtual int GetResolution() const
         { return -1; }
 
+#if wxUSE_GRAPHICS_CONTEXT
+    virtual wxGraphicsContext* GetGraphicsContext() const
+        { return NULL; }
+    virtual void SetGraphicsContext( wxGraphicsContext* WXUNUSED(ctx) )
+        {}
+#endif
+
 private:
     wxDC       *m_owner;
 
@@ -840,6 +912,15 @@ public:
     wxCoord GetCharWidth() const
         { return m_pimpl->GetCharWidth(); }
 
+    wxFontMetrics GetFontMetrics() const
+    {
+        wxFontMetrics fm;
+        m_pimpl->DoGetFontMetrics(&fm.height, &fm.ascent, &fm.descent,
+                                  &fm.internalLeading, &fm.externalLeading,
+                                  &fm.averageWidth);
+        return fm;
+    }
+
     void GetTextExtent(const wxString& string,
                        wxCoord *x, wxCoord *y,
                        wxCoord *descent = NULL,
@@ -939,7 +1020,7 @@ public:
 
     void SetLogicalScale(double x, double y)
         { m_pimpl->SetLogicalScale( x, y ); }
-    void GetLogicalScale(double *x, double *y)
+    void GetLogicalScale(double *x, double *y) const
         { m_pimpl->GetLogicalScale( x, y ); }
 
     void SetLogicalOrigin(wxCoord x, wxCoord y)
@@ -959,6 +1040,20 @@ public:
     void SetAxisOrientation(bool xLeftRight, bool yBottomUp)
         { m_pimpl->SetAxisOrientation(xLeftRight, yBottomUp); }
 
+#if wxUSE_DC_TRANSFORM_MATRIX
+    bool CanUseTransformMatrix() const
+        { return m_pimpl->CanUseTransformMatrix(); }
+
+    bool SetTransformMatrix(const wxAffineMatrix2D &matrix)
+        { return m_pimpl->SetTransformMatrix(matrix); }
+
+    wxAffineMatrix2D GetTransformMatrix() const
+        { return m_pimpl->GetTransformMatrix(); }
+
+    void ResetTransformMatrix()
+        { m_pimpl->ResetTransformMatrix(); }
+#endif // wxUSE_DC_TRANSFORM_MATRIX
+
     // mostly internal
     void SetDeviceLocalOrigin( wxCoord x, wxCoord y )
         { m_pimpl->SetDeviceLocalOrigin( x, y ); }
@@ -1245,6 +1340,17 @@ public:
     TempHDC GetTempHDC() { return TempHDC(*this); }
 #endif // __WXMSW__
 
+#if wxUSE_GRAPHICS_CONTEXT
+    virtual wxGraphicsContext* GetGraphicsContext() const
+    {
+        return m_pimpl->GetGraphicsContext();
+    }
+    virtual void SetGraphicsContext( wxGraphicsContext* ctx )
+    {
+        m_pimpl->SetGraphicsContext(ctx);
+    }
+#endif
+
 protected:
     // ctor takes ownership of the pointer
     wxDC(wxDCImpl *pimpl) : m_pimpl(pimpl) { }
@@ -1273,13 +1379,13 @@ public:
 
     ~wxDCTextColourChanger()
     {
-        if ( m_colFgOld.Ok() )
+        if ( m_colFgOld.IsOk() )
             m_dc.SetTextForeground(m_colFgOld);
     }
 
     void Set(const wxColour& col)
     {
-        if ( !m_colFgOld.Ok() )
+        if ( !m_colFgOld.IsOk() )
             m_colFgOld = m_dc.GetTextForeground();
         m_dc.SetTextForeground(col);
     }
@@ -1307,7 +1413,7 @@ public:
 
     ~wxDCPenChanger()
     {
-        if ( m_penOld.Ok() )
+        if ( m_penOld.IsOk() )
             m_dc.SetPen(m_penOld);
     }
 
@@ -1334,7 +1440,7 @@ public:
 
     ~wxDCBrushChanger()
     {
-        if ( m_brushOld.Ok() )
+        if ( m_brushOld.IsOk() )
             m_dc.SetBrush(m_brushOld);
     }
 
@@ -1377,14 +1483,27 @@ private:
 class WXDLLIMPEXP_CORE wxDCFontChanger
 {
 public:
-    wxDCFontChanger(wxDC& dc, const wxFont& font) : m_dc(dc), m_fontOld(dc.GetFont())
+    wxDCFontChanger(wxDC& dc)
+        : m_dc(dc), m_fontOld()
+    {
+    }
+
+    wxDCFontChanger(wxDC& dc, const wxFont& font)
+        : m_dc(dc), m_fontOld(dc.GetFont())
+    {
+        m_dc.SetFont(font);
+    }
+
+    void Set(const wxFont& font)
     {
+        if ( !m_fontOld.IsOk() )
+            m_fontOld = m_dc.GetFont();
         m_dc.SetFont(font);
     }
 
     ~wxDCFontChanger()
     {
-        if ( m_fontOld.Ok() )
+        if ( m_fontOld.IsOk() )
             m_dc.SetFont(m_fontOld);
     }