获取 ToolStripDropDownMenu 的 (ToolStrip) 父级



我正在编写一个自定义ToolStripProfessionalRenderer

以以下覆盖为例:

protected override void OnRenderImageMargin(ToolStripRenderEventArgs e)
{
    if(e.ToolStrip is MenuStrip)
    {
        // It never is. It's always ToolStripDropDownMenu
    }
}

我猜OnRenderImageMargin是由下拉菜单调用的,因为这是将要呈现的内容,但是我想获取导致OnRenderImageMargin调用的父ToolStrip/MenuStrip/StatusStrip

这可能吗?

我认为e.ToolStrip.Parent属性将是关键,但它总是null

一种选择是在ToolStripProfessionalRenderer中创建一个构造函数,并传入对该控件的引用。

class CustomRenderer : ToolStripProfessionalRenderer
{
    // All those controls derive from ToolStrip so we can use the base class here
    private ToolStrip ts;
    public CustomRenderer(ToolStrip ts)
    {
        this.ts = ts;
    }
    protected override void OnRenderImageMargin(ToolStripRenderEventArgs e)
    {
        if (ts is MenuStrip)  
        {
        }
        else if (ts is StatusStrip)
        {
        }
        else  // ts is ToolStrip
        {
        }
    }

然后在实例化引用时传递引用:

toolStrip1.Renderer = new CustomRenderer(toolStrip1);
statusStrip1.Renderer = new CustomRenderer(statusStrip1);

根据此答案修改的替代选项。

忘记 ctor 并反复测试Owner,直到获得正确的父控件:

protected override void OnRenderImageMargin(ToolStripRenderEventArgs e)
{
    ToolStrip owner = e.ToolStrip;
    while (owner is ToolStripDropDownMenu)
        owner = (owner as ToolStripDropDownMenu).OwnerItem.Owner;
    if (ts is MenuStrip)  
    {
    }
    else if (ts is StatusStrip)
    {
    }
    else  // ts is ToolStrip
    {
    }      
}

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