initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/msw/private/customdraw.h

@@ -0,0 +1,109 @@
+///////////////////////////////////////////////////////////////////////////////
+// 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/uxtheme.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 nullptr 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
+
+// ----------------------------------------------------------------------------
+// wxMSWHeaderCtrlCustomDraw: custom draw helper for header control
+// ----------------------------------------------------------------------------
+
+class wxMSWHeaderCtrlCustomDraw : public wxMSWImpl::CustomDraw
+{
+public:
+    wxMSWHeaderCtrlCustomDraw()
+    {
+    }
+
+    // Set the colours to the ones used by "Header" theme.
+    //
+    // This is required, for unknown reasons, when using dark mode, because
+    // enabling it for the header control changes the background, but not the
+    // foreground, making the text completely unreadable.
+    //
+    // If this is ever fixed in later Windows versions, this function wouldn't
+    // need to be called any more.
+    void UseHeaderThemeColors(HWND hwndHdr)
+    {
+        auto theme = wxUxThemeHandle::NewAtStdDPI(hwndHdr, L"Header");
+
+        m_attr.SetTextColour(theme.GetColour(HP_HEADERITEM, TMT_TEXTCOLOR));
+
+        // Note that TMT_FILLCOLOR doesn't seem to exist in this theme but the
+        // correct background colour is already used in "ItemsView" theme by
+        // default anyhow.
+    }
+
+    // Make this field public to let the control update it directly when its
+    // attributes change.
+    wxItemAttr m_attr;
+
+private:
+    virtual bool HasCustomDrawnItems() const override
+    {
+        // We only exist if the header does need to be custom drawn.
+        return true;
+    }
+
+    virtual const wxItemAttr*
+    GetItemAttr(DWORD_PTR WXUNUSED(dwItemSpec)) const override
+    {
+        // We use the same attribute for all items for now.
+        return &m_attr;
+    }
+};
+
+#endif // _WX_MSW_CUSTOMDRAW_H_