110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/private/customdraw.h
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// Purpose: Helper for implementing custom drawing support in wxMSW
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// Author: Vadim Zeitlin
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// Created: 2016-04-16
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// Copyright: (c) 2016 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_MSW_CUSTOMDRAW_H_
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#define _WX_MSW_CUSTOMDRAW_H_
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#include "wx/itemattr.h"
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#include "wx/msw/uxtheme.h"
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#include "wx/msw/wrapcctl.h"
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namespace wxMSWImpl
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{
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// ----------------------------------------------------------------------------
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// CustomDraw: inherit from this class and forward NM_CUSTOMDRAW to it
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// ----------------------------------------------------------------------------
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class CustomDraw
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{
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public:
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// Trivial default ctor needed for non-copyable class.
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CustomDraw()
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{
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}
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// Virtual dtor for the base class.
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virtual ~CustomDraw()
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{
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}
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// Implementation of NM_CUSTOMDRAW handler, returns one of CDRF_XXX
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// constants, possibly CDRF_DODEFAULT if custom drawing is not necessary.
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LPARAM HandleCustomDraw(LPARAM lParam);
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private:
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// Return true if we need custom drawing at all.
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virtual bool HasCustomDrawnItems() const = 0;
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// Return the attribute to use for the given item, can return nullptr if this
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// item doesn't need to be custom-drawn.
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virtual const wxItemAttr* GetItemAttr(DWORD_PTR dwItemSpec) const = 0;
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// Set the colours and font for the specified HDC, return CDRF_NEWFONT if
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// the font was changed.
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LPARAM HandleItemPrepaint(const wxItemAttr& attr, HDC hdc);
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wxDECLARE_NO_COPY_CLASS(CustomDraw);
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};
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} // namespace wxMSWImpl
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// ----------------------------------------------------------------------------
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// wxMSWHeaderCtrlCustomDraw: custom draw helper for header control
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// ----------------------------------------------------------------------------
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class wxMSWHeaderCtrlCustomDraw : public wxMSWImpl::CustomDraw
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{
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public:
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wxMSWHeaderCtrlCustomDraw()
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{
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}
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// Set the colours to the ones used by "Header" theme.
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//
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// This is required, for unknown reasons, when using dark mode, because
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// enabling it for the header control changes the background, but not the
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// foreground, making the text completely unreadable.
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//
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// If this is ever fixed in later Windows versions, this function wouldn't
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// need to be called any more.
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void UseHeaderThemeColors(HWND hwndHdr)
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{
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auto theme = wxUxThemeHandle::NewAtStdDPI(hwndHdr, L"Header");
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m_attr.SetTextColour(theme.GetColour(HP_HEADERITEM, TMT_TEXTCOLOR));
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// Note that TMT_FILLCOLOR doesn't seem to exist in this theme but the
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// correct background colour is already used in "ItemsView" theme by
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// default anyhow.
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}
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// Make this field public to let the control update it directly when its
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// attributes change.
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wxItemAttr m_attr;
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private:
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virtual bool HasCustomDrawnItems() const override
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{
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// We only exist if the header does need to be custom drawn.
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return true;
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}
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virtual const wxItemAttr*
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GetItemAttr(DWORD_PTR WXUNUSED(dwItemSpec)) const override
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{
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// We use the same attribute for all items for now.
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return &m_attr;
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}
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};
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#endif // _WX_MSW_CUSTOMDRAW_H_
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