Function MouseLoop

src/window.cpp:2858–2961

}

static void MouseLoop(MouseClick click, int mousewheel)
{
	/* World generation is multithreaded and messes with companies.
	 * But there is no company related window open anyway, so _current_company is not used. */
	assert(HasModalProgress() || IsLocalCompany());

	HandlePlacePresize();
	UpdateTileSelection();

	if (VpHandlePlaceSizingDrag()  == ES_HANDLED) return;
	if (HandleMouseDragDrop()      == ES_HANDLED) return;
	if (HandleWindowDragging()     == ES_HANDLED) return;
	if (HandleActiveWidget()       == ES_HANDLED) return;
	if (HandleViewportScroll()     == ES_HANDLED) return;

	HandleMouseOver();

	bool scrollwheel_scrolling = _settings_client.gui.scrollwheel_scrolling == SWS_SCROLL_MAP && _cursor.wheel_moved;
	if (click == MC_NONE && mousewheel == 0 && !scrollwheel_scrolling) return;

	int x = _cursor.pos.x;
	int y = _cursor.pos.y;
	Window *w = FindWindowFromPt(x, y);
	if (w == nullptr) return;

	if (click != MC_HOVER && !MaybeBringWindowToFront(w)) return;
	Viewport *vp = IsPtInWindowViewport(w, x, y);

	/* Don't allow any action in a viewport if either in menu or when having a modal progress window */
	if (vp != nullptr && (_game_mode == GM_MENU || HasModalProgress())) return;

	if (mousewheel != 0) {
		/* Send mousewheel event to window, unless we're scrolling a viewport or the map */
		if (!scrollwheel_scrolling || (vp == nullptr && w->window_class != WC_SMALLMAP)) {
			if (NWidgetCore *nwid = w->nested_root->GetWidgetFromPos(x - w->left, y - w->top); nwid != nullptr) {
				w->OnMouseWheel(mousewheel, nwid->GetIndex());
			}
		}

		/* Dispatch a MouseWheelEvent for widgets if it is not a viewport */
		if (vp == nullptr) DispatchMouseWheelEvent(w, w->nested_root->GetWidgetFromPos(x - w->left, y - w->top), mousewheel);
	}

	if (vp != nullptr) {
		if (scrollwheel_scrolling && !w->flags.Test(WindowFlag::DisableVpScroll)) {
			_scrolling_viewport = true;
			_cursor.fix_at = true;
			return;
		}

		switch (click) {
			case MC_DOUBLE_LEFT:
			case MC_LEFT:
				if (HandleViewportClicked(*vp, x, y)) return;
				if (!w->flags.Test(WindowFlag::DisableVpScroll) &&
						_settings_client.gui.scroll_mode == VSM_MAP_LMB) {
					_scrolling_viewport = true;
					_cursor.fix_at = false;