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Fix "Windows rapidly changing scales near edge between screens" (#1439)
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This commit is contained in:
ManoloFLTK
2026-05-19 12:45:20 +02:00
parent 298466c8be
commit d4d815cfb4
1 changed files with 3 additions and 21 deletions
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src/Fl_win32.cxx
+3 -21
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@@ -1778,27 +1778,9 @@ content key keyboard layout
}
if (moving_window) resize_bug_fix = window;
POINTS pts = MAKEPOINTS(lParam);
int nx = pts.x, ny = pts.y;
// detect when window centre changes screen
Fl_WinAPI_Screen_Driver *sd = (Fl_WinAPI_Screen_Driver *)Fl::screen_driver();
Fl_WinAPI_Window_Driver *wd = Fl_WinAPI_Window_Driver::driver(window);
int olds = wd->screen_num();
// Issue #1097: when a fullscreen window is restored to its size, it receives first a WM_MOVE
// and then a WM_SIZE, so it still has its fullscreen size at the WM_MOVE event, which defeats
// using window->w()|h() to compute the center of the (small) window. We detect this situation
// with condition: !window->fullscreen_active() && *wd->no_fullscreen_w()
// and use *wd->no_fullscreen_w()|h() instead of window->w()|h().
int trueW = window->w(), trueH = window->h();
if (!window->fullscreen_active() && *wd->no_fullscreen_w()) {
trueW = *wd->no_fullscreen_w(); trueH = *wd->no_fullscreen_h();
}
int news = sd->screen_num_unscaled(nx + int(trueW * scale / 2), ny + int(trueH * scale / 2));
if (news == -1)
news = olds;
else if (news != olds) wd->screen_num(news);
scale = sd->scale(news);
wd->x(int(round(nx/scale)));
wd->y(int(round(ny/scale)));
Fl_Window_Driver *wd = Fl_Window_Driver::driver(window);
wd->x(int(round(pts.x / scale)));
wd->y(int(round(pts.y / scale)));
}
return 0;