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///////////////////////////////////////////////////////////////////////////////
// Name: wx/msw/private/customdraw.h
// Purpose: Helper for implementing custom drawing support in wxMSW
// Author: Vadim Zeitlin
// Created: 2016-04-16
// Copyright: (c) 2016 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_MSW_CUSTOMDRAW_H_
#define _WX_MSW_CUSTOMDRAW_H_
#include "wx/itemattr.h"
#include "wx/msw/wrapcctl.h"
namespace wxMSWImpl
{
// ----------------------------------------------------------------------------
// CustomDraw: inherit from this class and forward NM_CUSTOMDRAW to it
// ----------------------------------------------------------------------------
class CustomDraw
{
public:
// Trivial default ctor needed for non-copyable class.
CustomDraw()
{
}
// Virtual dtor for the base class.
virtual ~CustomDraw()
{
}
// Implementation of NM_CUSTOMDRAW handler, returns one of CDRF_XXX
// constants, possibly CDRF_DODEFAULT if custom drawing is not necessary.
LPARAM HandleCustomDraw(LPARAM lParam);
private:
// Return true if we need custom drawing at all.
virtual bool HasCustomDrawnItems() const = 0;
// Return the attribute to use for the given item, can return NULL if this
// item doesn't need to be custom-drawn.
virtual const wxItemAttr* GetItemAttr(DWORD_PTR dwItemSpec) const = 0;
// Set the colours and font for the specified HDC, return CDRF_NEWFONT if
// the font was changed.
LPARAM HandleItemPrepaint(const wxItemAttr& attr, HDC hdc);
wxDECLARE_NO_COPY_CLASS(CustomDraw);
};
} // namespace wxMSWImpl
#endif // _WX_MSW_CUSTOMDRAW_H_
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