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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 FOCUS_1084731021985757843
#define FOCUS_1084731021985757843
#include <wx/toplevel.h>
namespace zen
{
//pretty much the same like "bool wxWindowBase::IsDescendant(wxWindowBase* child) const" but without the obvious misnomer
inline
bool isComponentOf(const wxWindow* child, const wxWindow* top)
{
for (const wxWindow* wnd = child; wnd != nullptr; wnd = wnd->GetParent())
if (wnd == top)
return true;
return false;
}
inline
wxTopLevelWindow* getTopLevelWindow(wxWindow* child)
{
for (wxWindow* wnd = child; wnd != nullptr; wnd = wnd->GetParent())
if (auto tlw = dynamic_cast<wxTopLevelWindow*>(wnd)) //why does wxWidgets use wxWindows::IsTopLevel() ??
return tlw;
return nullptr;
}
/*
Preserving input focus has to be more clever than:
wxWindow* oldFocus = wxWindow::FindFocus();
ZEN_ON_SCOPE_EXIT(if (oldFocus) oldFocus->SetFocus());
=> wxWindow::SetFocus() internally calls Win32 ::SetFocus, which calls ::SetActiveWindow, which - lord knows why - changes the foreground window to the focus window
even if the user is currently busy using a different app! More curiosity: this foreground focus stealing happens only during the *first* SetFocus() after app start!
It also can be avoided by changing focus back and forth with some other app after start => wxWidgets bug or Win32 feature???
*/
struct FocusPreserver
{
~FocusPreserver()
{
//wxTopLevelWindow::IsActive() does NOT call Win32 ::GetActiveWindow()!
//Instead it checks if ::GetFocus() is set somewhere inside the top level
//Note: Both Win32 active and focus windows are *thread-local* values, while foreground window is global! https://blogs.msdn.microsoft.com/oldnewthing/20131016-00/?p=2913
if (oldFocus_)
if (wxTopLevelWindow* topWin = getTopLevelWindow(oldFocus_))
if (topWin->IsActive()) //Linux/macOS: already behaves just like ::GetForegroundWindow() on Windows!
oldFocus_->SetFocus();
}
wxWindow* getFocus() const { return oldFocus_; }
void setFocus(wxWindow* win) { oldFocus_ = win; }
private:
wxWindow* oldFocus_ = wxWindow::FindFocus();
};
}
#endif //FOCUS_1084731021985757843
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