C++ (Cpp) UIWidgetPtr::onHoverChange示例

void UIManager::updateHoveredWidget(bool now)
{
    if(m_hoverUpdateScheduled && !now)
        return;

    auto func = [this] {
        if(!m_rootWidget)
            return;

        m_hoverUpdateScheduled = false;
        UIWidgetPtr hoveredWidget;
        //if(!g_window.isMouseButtonPressed(Fw::MouseLeftButton) && !g_window.isMouseButtonPressed(Fw::MouseRightButton)) {
            hoveredWidget = m_rootWidget->recursiveGetChildByPos(g_window.getMousePosition(), false);
            if(hoveredWidget && !hoveredWidget->isEnabled())
                hoveredWidget = nullptr;
        //}

        if(hoveredWidget != m_hoveredWidget) {
            UIWidgetPtr oldHovered = m_hoveredWidget;
            m_hoveredWidget = hoveredWidget;
            if(oldHovered) {
                oldHovered->updateState(Fw::HoverState);
                oldHovered->onHoverChange(false);
            }
            if(hoveredWidget) {
                hoveredWidget->updateState(Fw::HoverState);
                hoveredWidget->onHoverChange(true);
            }
        }
    };

    if(now)
        func();
    else {
        m_hoverUpdateScheduled = true;
        g_dispatcher.addEvent(func);
    }
}