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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>
#include <wx/display.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
wxWindow& getRootWindow(wxWindow& child)
{
wxWindow* root = &child;
for (;;)
if (wxWindow* parent = root->GetParent())
root = parent;
else
return *root;
}
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()
{
if (wxWindow* win = wxWindow::FindFocus())
setFocus(win);
}
~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://devblogs.microsoft.com/oldnewthing/20131016-00/?p=2913
if (oldFocusId_ != wxID_ANY)
if (wxWindow* oldFocusWin = wxWindow::FindWindowById(oldFocusId_))
if (wxTopLevelWindow* topWin = getTopLevelWindow(oldFocusWin))
if (topWin->IsActive()) //Linux/macOS: already behaves just like ::GetForegroundWindow() on Windows!
oldFocusWin->SetFocus();
}
wxWindowID getFocusId() const { return oldFocusId_; }
void setFocus(wxWindow* win)
{
oldFocusId_ = win->GetId();
assert(oldFocusId_ != wxID_ANY);
}
private:
wxWindowID oldFocusId_ = wxID_ANY;
//don't store wxWindow* which may be dangling during ~FocusPreserver()!
//test: click on delete folder pair and immediately press F5 => focus window (= FP del button) is defer-deleted during sync
};
namespace
{
void setInitialWindowSize(wxTopLevelWindow& topWin, wxSize size, std::optional<wxPoint> pos, bool isMaximized, wxSize defaultSize)
{
wxSize newSize = defaultSize;
std::optional<wxPoint> newPos;
//set dialog size and position:
// - width/height are invalid if the window is minimized (eg x,y = -32000; width = 160, height = 28)
// - multi-monitor setup: dialog may be placed on second monitor which is currently turned off
if (size.GetWidth () > 0 &&
size.GetHeight() > 0)
{
if (pos)
{
//calculate how much of the dialog will be visible on screen
const int dlgArea = size.GetWidth() * size.GetHeight();
int dlgAreaMaxVisible = 0;
const int monitorCount = wxDisplay::GetCount();
for (int i = 0; i < monitorCount; ++i)
{
wxRect overlap = wxDisplay(i).GetClientArea().Intersect(wxRect(*pos, size));
dlgAreaMaxVisible = std::max(dlgAreaMaxVisible, overlap.GetWidth() * overlap.GetHeight());
}
if (dlgAreaMaxVisible > 0.1 * dlgArea //at least 10% of the dialog should be visible!
)
{
newSize = size;
newPos = pos;
}
}
else
newSize = size;
}
//old comment: "wxGTK's wxWindow::SetSize seems unreliable and behaves like a wxWindow::SetClientSize
// => use wxWindow::SetClientSize instead (for the record: no such issue on Windows/macOS)
//2018-10-15: Weird new problem on CentOS/Ubuntu: SetClientSize() + SetPosition() fail to set correct dialog *position*, but SetSize() + SetPosition() do!
// => old issues with SetSize() seem to be gone... => revert to SetSize()
if (newPos)
topWin.SetSize(wxRect(*newPos, newSize));
else
{
topWin.SetSize(newSize);
topWin.Center();
}
if (isMaximized) //no real need to support both maximize and full screen functions
{
topWin.Maximize(true);
}
}
struct WindowLayoutWeak
{
std::optional<wxSize> size;
std::optional<wxPoint> pos;
bool isMaximized = false;
};
//destructive! changes window size!
WindowLayoutWeak getWindowSizeBeforeClose(wxTopLevelWindow& topWin)
{
//we need to portably retrieve non-iconized, non-maximized size and position
// non-portable: Win32 GetWindowPlacement(); wxWidgets take: wxTopLevelWindow::RestoreToGeometry()
if (topWin.IsIconized())
topWin.Iconize(false);
WindowLayoutWeak layout;
if (topWin.IsMaximized()) //evaluate AFTER uniconizing!
{
topWin.Maximize(false);
layout.isMaximized = true;
}
layout.size = topWin.GetSize();
layout.pos = topWin.GetPosition();
if (layout.isMaximized)
if (!topWin.IsShown() //=> Win: can't trust size GetSize()/GetPosition(): still at full screen size!
//wxGTK: returns full screen size and strange position (65/-4)
//OS X 10.9 (but NO issue on 10.11!) returns full screen size and strange position (0/-22)
|| layout.pos->y < 0
)
{
layout.size = std::nullopt;
layout.pos = std::nullopt;
}
return layout;
}
}
}
#endif //FOCUS_1084731021985757843
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