ant-design-blazor/components/menu/SubMenu.razor

@namespace AntDesign
@inherits AntDomComponentBase
@using AntDesign.Internal

@{
    string prefixCls = $"{RootMenu.PrefixCls}-submenu";
}

@if (RootMenu.InternalMode == MenuMode.Inline)
{
    <li class="@ClassMapper.Class" role="menuitem" @key="Key" style="position:relative;@Style" @ref="Ref">
        <div class="@(prefixCls)-title" style="padding-left: @(PaddingLeft)px; " role="button" @onclick="HandleOnTitleClick" aria-haspopup="true">
            @if (TitleTemplate != null)
            {
                @TitleTemplate
            }
            else if (Title != null)
            {
                <span>@Title</span>
            }
            <i class="@(prefixCls)-arrow"></i>
        </div>
        <ul direction="ltr" class="@SubMenuMapper.Class" role="menu" aria-expanded="@IsOpen">
            <CascadingValue Value="this" IsFixed="@true">
                @ChildContent
            </CascadingValue>
        </ul>
    </li>
}
else if (RootMenu.InlineCollapsed || RootMenu.InternalMode == MenuMode.Horizontal || Level == 0)
{
    if (Placement == null)
    {
        Placement = (RootMenu.Mode == MenuMode.Horizontal && Parent == null) ? AntDesign.Placement.BottomLeft : AntDesign.Placement.RightTop;
    }
    <CascadingValue Value="this" Name="SubMenu" IsFixed>
        <CascadingValue Value="@prefixCls" Name="PrefixCls" IsFixed>
            <SubMenuTrigger @ref="_overlayTrigger"
                            TriggerClass="@ClassMapper.Class"
                            Visible="IsOpen"
                            ComplexAutoCloseAndVisible="true"
						    BoundaryAdjustMode="@TriggerBoundaryAdjustMode.None"
                            Disabled="Disabled"
                            Placement="Placement.Value"
                            OnVisibleChange="OnOverlayVisibleChange"
                            OnOverlayHiding="OnOverlayHiding"
                            Trigger="new Trigger[] { RootMenu?.TriggerSubMenuAction ?? AntDesign.Trigger.Hover }"
                            PlacementCls="@($"{prefixCls}-popup {RootMenu.PrefixCls} {RootMenu.PrefixCls}-{RootMenu.Theme} {prefixCls}-placement-{_placement.Name}")"
                            OverlayEnterCls="@($"{prefixCls}-{RootMenu.Theme} ")"
                            OverlayLeaveCls="@($"{prefixCls}-{RootMenu.Theme} ")"
                            OverlayHiddenCls="@($"{prefixCls}-hidden")">
                <ChildContent>
                    <div class="@(prefixCls)-title" role="button">
                        @if (TitleTemplate != null)
                        {
                            @TitleTemplate
                        }
                        else if (Title != null)
                        {
                            <span>@Title</span>
                        }
                        @GetArrow()
                    </div>
                </ChildContent>
                <Overlay>
                    <ul direction="ltr" class="@(SubMenuMapper.Class)" style="@_popupMinWidthStyle" role="menu">
                        <CascadingValue Value="this" IsFixed="@true">
                            @ChildContent
                        </CascadingValue>
                    </ul>
                </Overlay>
            </SubMenuTrigger>
        </CascadingValue>
    </CascadingValue>
}

@code
{
    private RenderFragment GetArrow()
    {        
        string prefixCls = $"{RootMenu.PrefixCls}-submenu";
        if (RootMenu.PrefixCls.Contains("dropdown"))
        {
            return @<span class="@(prefixCls)-arrow">
                <span role="img" aria-label="right" class="anticon anticon-right @(prefixCls)-arrow-icon">
                    <svg viewBox="64 64 896 896" focusable="false" class="" data-icon="right" width="1em" height="1em" fill="currentColor" aria-hidden="true">
                        <path d="M765.7 486.8L314.9 134.7A7.97 7.97 0 00302 141v77.3c0 4.9 2.3 9.6 6.1 12.6l360 281.1-360 281.1c-3.9 3-6.1 7.7-6.1 12.6V883c0 6.7 7.7 10.4 12.9 6.3l450.8-352.1a31.96 31.96 0 000-50.4z"></path>
                    </svg>
                </span>
            </span>;
        }
        else if (Parent is AntDesign.SubMenu || RootMenu.Mode == MenuMode.Vertical)
        {
            return @<i class="@(prefixCls)-arrow"></i>;    
        }        
        return default;
    }
}