152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
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/*
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* _DEVDSC.H
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*
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* Purpose:
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* CDevDesc (Device Descriptor) class
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*
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* Authors:
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* Original RichEdit code: David R. Fulmer
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* Christian Fortini
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* Murray Sargent
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*/
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#ifndef _DEVDSC_H
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#define _DEVDSC_H
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class CTxtEdit;
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// device descriptor
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class CDevDesc
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{
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friend class CMeasurer;
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protected:
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CTxtEdit * _ped; // used to GetDC and ReleaseDC
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HDC _hdc; // hdc for rendering device
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BOOL _fMetafile; // Is this device a metafile.
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SHORT _dxpInch; // device units per horizontal "inch"
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SHORT _dypInch; // device units per vertical "inch"
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HDC GetScreenDC () const;
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void ReleaseScreenDC (HDC hdc) const;
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public:
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CDevDesc(CTxtEdit * ped)
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{
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_fMetafile = FALSE;
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_ped = ped;
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_hdc = NULL;
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_dxpInch = 0;
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_dypInch = 0;
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}
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// Test validity of device descriptor
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// (whether SetDC has been properly called)
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BOOL IsValid() const {return _dxpInch != 0 && _dypInch != 0;}
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BOOL IsMetafile() const
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{
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if(!_hdc)
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return FALSE;
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return _fMetafile;
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}
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BOOL SetDC(HDC hdc, LONG dxpInch = -1, LONG dypInch = -1);
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void SetMetafileDC(
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HDC hdcMetafile,
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LONG xMeasurePerInch,
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LONG yMeasurePerInch);
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void ResetDC() { SetDC(NULL); }
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//REVIEW (keithcu) GetScreenDC/ReleaseScreenDC needed?
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HDC GetDC() const
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{
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if(_hdc)
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return _hdc;
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return GetScreenDC();
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}
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void ReleaseDC(HDC hdc) const
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{
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if(!_hdc)
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ReleaseScreenDC(hdc);
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}
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// REVIEW (keithcu) Verify callers of these routines logic...Think of a way to make it hard for people
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// to screw up?
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// Methods for converting between pixels and himetric
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LONG HimetricXtoDX(LONG xHimetric) const { return W32->HimetricToDevice(xHimetric, _dxpInch); }
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LONG HimetricYtoDY(LONG yHimetric) const { return W32->HimetricToDevice(yHimetric, _dypInch); }
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LONG DXtoHimetricX(LONG dx) const { return W32->DeviceToHimetric(dx, _dxpInch); }
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LONG DYtoHimetricY(LONG dy) const { return W32->DeviceToHimetric(dy, _dypInch); }
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void LRtoDR(RECT &rcDest, const RECT &rcSrc, TFLOW tflow) const;
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LONG DXtoLX(LONG x) const
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{
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AssertSz(_dxpInch, "CDevDesc::DXtoLX() - hdc has not been set");
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return MulDiv(x, LX_PER_INCH, _dxpInch);
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}
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LONG DYtoLY(LONG y) const
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{
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AssertSz(_dypInch, "CDevDesc::DYtoLY() - hdc has not been set");
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return MulDiv(y, LY_PER_INCH, _dypInch);
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}
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LONG LXtoDX(LONG x) const
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{
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AssertSz(_dxpInch, "CDevDesc::LXtoDX() - hdc has not been set");
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return MulDiv(x, _dxpInch, LX_PER_INCH);
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}
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LONG LYtoDY(LONG y) const
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{
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AssertSz(_dypInch, "CDevDesc::LYtoDY() - hdc has not been set");
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return MulDiv(y, _dypInch, LY_PER_INCH);
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}
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BOOL SameDevice(const CDevDesc *pdd) const
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{
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return (_dxpInch == pdd->_dxpInch) && (_dypInch == pdd->_dypInch) ? TRUE : FALSE;
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}
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// Assignment
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CDevDesc& operator = (const CDevDesc& dd)
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{
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_hdc = dd._hdc;
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_dxpInch = dd._dxpInch;
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_dypInch = dd._dypInch;
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return *this;
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}
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// Compares two device descriptors
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BOOL operator == (const CDevDesc& dd) const
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{
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return _hdc == dd._hdc;
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}
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BOOL operator != (const CDevDesc& dd) const
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{
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return !(*this == dd);
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}
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LONG GetDxpInch() const
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{
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AssertSz(_dxpInch != 0, "CDevDesc::GetDxpInch _dxpInch is 0");
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return _dxpInch;
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}
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LONG GetDypInch() const
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{
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AssertSz(_dypInch != 0, "CDevDesc::GetDypInch _dypInch is 0");
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return _dypInch;
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}
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};
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#endif
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