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Win32: Mouse wheel zooming always remains properly centered

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On scroll wheel events convert the mouse coordinates from screen to client
area so that scroll wheel zooming remains centered irrespective of the
window position.

Fixes https://github.com/solvespace/solvespace/issues/806
This commit is contained in:
ruevs 2020-11-22 19:58:46 +02:00 committed by phkahler
parent bdd2be6041
commit 5137da295a
1 changed files with 9 additions and 2 deletions
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11
src/platform/guiwin.cpp
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@ -907,8 +907,8 @@ public:
// Make the mousewheel work according to which window the mouse is
// over, not according to which window is active.
POINT pt;
pt.x = LOWORD(lParam);
pt.y = HIWORD(lParam);
pt.x = GET_X_LPARAM(lParam);
pt.y = GET_Y_LPARAM(lParam);
HWND hWindowUnderMouse;
sscheck(hWindowUnderMouse = WindowFromPoint(pt));
if(hWindowUnderMouse && hWindowUnderMouse != h) {
@ -917,6 +917,13 @@ public:
break;
}
// Convert the mouse coordinates from screen to client area so that
// scroll wheel zooming remains centered irrespective of the window
// position.
ScreenToClient(hWindowUnderMouse, &pt);
event.x = pt.x / pixelRatio;
event.y = pt.y / pixelRatio;
event.type = MouseEvent::Type::SCROLL_VERT;
event.scrollDelta = GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? 1 : -1;
break;