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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef RTL_H_0183487180058718273432148
#define RTL_H_0183487180058718273432148
#include <wx/dcmemory.h>
#include <wx/image.h>
#include <wx/app.h>
#include "dc.h"
namespace zen
{
//functions supporting right-to-left GUI layout
void drawBitmapRtlMirror (wxDC& dc, const wxImage& img, const wxRect& rect, int alignment, std::optional<wxBitmap>& buffer);
void drawBitmapRtlNoMirror(wxDC& dc, const wxImage& img, const wxRect& rect, int alignment);
//wxDC::DrawIcon DOES mirror by default -> implement RTL support when needed
wxImage mirrorIfRtl(const wxImage& img);
//manual text flow correction: https://www.w3.org/International/articles/inline-bidi-markup/
//---------------------- implementation ------------------------
namespace impl
{
//don't use wxDC::DrawLabel:
// - expensive GetTextExtent() call even when passing an empty string!!!
// - 1-off alignment bugs!
inline
void drawBitmapAligned(wxDC& dc, const wxImage& img, const wxRect& rect, int alignment)
{
wxPoint pt = rect.GetTopLeft();
if (alignment & wxALIGN_RIGHT) //note: wxALIGN_LEFT == 0!
pt.x += rect.width - img.GetWidth();
else if (alignment & wxALIGN_CENTER_HORIZONTAL)
pt.x += (rect.width - img.GetWidth()) / 2;
if (alignment & wxALIGN_BOTTOM) //note: wxALIGN_TOP == 0!
pt.y += rect.height - img.GetHeight();
else if (alignment & wxALIGN_CENTER_VERTICAL)
pt.y += (rect.height - img.GetHeight()) / 2;
dc.DrawBitmap(toScaledBitmap(img), pt);
}
}
inline
void drawBitmapRtlMirror(wxDC& dc, const wxImage& img, const wxRect& rect, int alignment, std::optional<wxBitmap>& buffer)
{
switch (dc.GetLayoutDirection())
{
case wxLayout_LeftToRight:
return impl::drawBitmapAligned(dc, img, rect, alignment);
case wxLayout_RightToLeft:
if (rect.GetWidth() > 0 && rect.GetHeight() > 0)
{
if (!buffer || buffer->GetSize() != rect.GetSize()) //[!] since we do a mirror, width needs to match exactly!
buffer.emplace(rect.GetSize());
if (buffer->GetScaleFactor() != dc.GetContentScaleFactor()) //needed here?
buffer->SetScaleFactor(dc.GetContentScaleFactor()); //
wxMemoryDC memDc(*buffer); //copies scale factor from wxBitmap
memDc.Blit(wxPoint(0, 0), rect.GetSize(), &dc, rect.GetTopLeft()); //blit in: background is mirrored due to memDc, dc having different layout direction!
impl::drawBitmapAligned(memDc, img, wxRect(0, 0, rect.width, rect.height), alignment);
//note: we cannot simply use memDc.SetLayoutDirection(wxLayout_RightToLeft) due to some strange 1 pixel bug! 2022-04-04: maybe fixed in wxWidgets 3.1.6?
dc.Blit(rect.GetTopLeft(), rect.GetSize(), &memDc, wxPoint(0, 0)); //blit out: mirror once again
}
break;
case wxLayout_Default: //CAVEAT: wxPaintDC/wxMemoryDC on wxGTK/wxMAC does not implement SetLayoutDirection()!!! => GetLayoutDirection() == wxLayout_Default
if (wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft)
return impl::drawBitmapAligned(dc, img.Mirror(), rect, alignment);
else
return impl::drawBitmapAligned(dc, img, rect, alignment);
}
}
inline
void drawBitmapRtlNoMirror(wxDC& dc, const wxImage& img, const wxRect& rect, int alignment)
{
return impl::drawBitmapAligned(dc, img, rect, alignment); //wxDC::DrawBitmap does NOT mirror by default
}
inline
wxImage mirrorIfRtl(const wxImage& img)
{
if (wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft)
return img.Mirror();
else
return img;
}
}
#endif //RTL_H_0183487180058718273432148
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