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Generate better FL_LEAVE coordinates on Windows (#87)

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Use the current mouse position to estimate the
position where the mouse left the window. Not
perfect, but much better than repeating the last
move coordinates.
This commit is contained in:
MatthiasWM 2025-07-16 17:39:07 +02:00
parent 86f2904858
commit 890f538bb5
1 changed files with 24 additions and 2 deletions
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26
src/Fl_win32.cxx
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@ -45,6 +45,7 @@
// Some versions of MinGW now require us to explicitly include winerror to get S_OK defined
#include <winerror.h>
#include <math.h> // for ceil() and round()
#include <algorithm> // for min and max (clamp is C++17)
void fl_free_fonts(void);
void fl_release_dc(HWND, HDC);
@ -117,6 +118,11 @@ extern void fl_cleanup_pens(void);
// Internal functions
static void fl_clipboard_notify_target(HWND wnd);
static void fl_clipboard_notify_untarget(HWND wnd);
static int clamp(int v, int a, int b) {
if (v < a) return a;
if (v > b) return b;
return v;
}
// Internal variables
static HWND clipboard_wnd = 0;
@ -1023,6 +1029,12 @@ void fl_get_codepage() {
HWND fl_capture;
// \param[in] window The FLTK window that generated the event
// \param[in] what 0 = down, 1 = double down, 2 = up, 3 = move
// \param[in] button 1 = left, 2 = middle, 3 = right, 4 = XBUTTON1, 5 = any other XBUTTON
// \param[in] wParam depends on event, for example MK_LBUTTON, MK_MBUTTON, MK_RBUTTON, MK_XBUTTON1, MK_XBUTTON2
// \param[in] lParam 32 bit value, top 16 bit are the signed y coordinate, bottom 16 bits is x in window space
// WM_KILLFOCUS calls this with (Fl::grab(), 0, 1, MK_LBUTTON, MAKELPARAM(32767, 0))
static int mouse_event(Fl_Window *window, int what, int button,
WPARAM wParam, LPARAM lParam) {
static int px, py, pmx, pmy;
@ -1391,6 +1403,16 @@ static LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lPar
Fl_Window *tw = window;
while (tw->parent()) // find top level window
tw = tw->window();
// Get a better mouse position for FL_LEAVE event (#87)
POINT pt;
if (GetCursorPos(&pt)) {
float scale = Fl::screen_driver()->scale(tw->screen_num());
Fl::e_x_root = int(pt.x / scale);
Fl::e_y_root = int(pt.y / scale);
ScreenToClient(fl_xid(tw), &pt);
Fl::e_x = clamp(int(pt.x / scale), 0, window->w() - 1);
Fl::e_y = clamp(int(pt.y / scale), 0, window->h() - 1);
}
Fl::belowmouse(0);
Fl::handle(FL_LEAVE, tw);
}
@ -1407,8 +1429,8 @@ static LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lPar
case WM_KILLFOCUS:
if (Fl::grab() && (Fl::grab() != window) && Fl::grab()->menu_window()) {
// simulate click at remote location (see issue #1166)
mouse_event(Fl::grab(), 0, 1, MK_LBUTTON, MAKELPARAM(100000, 0));
// simulate click at remote location (see issue #1166), coordinates are signed 16 bit values
mouse_event(Fl::grab(), 0, 1, MK_LBUTTON, MAKELPARAM(32767, 0));
}
Fl::handle(FL_UNFOCUS, window);
Fl::flush(); // it never returns to main loop when deactivated...