更改 ToolStrip 子菜单的透明度

Question

我现在正在篡改 ToolStrip 修改，并试图使子菜单也像 MenuStrip 一样透明。我无法使子菜单的属性像菜单本身一样。

我该怎么做？

这是我的修改代码：

    public class ArrowRenderer : ToolStripProfessionalRenderer
    {
        public ArrowRenderer() : base(new LeftMenuColorTable())
        {

        }
        protected override void OnRenderItemText(ToolStripItemTextRenderEventArgs e)
        {
            var tsMenuItem = e.Item as ToolStripMenuItem;
            if (tsMenuItem != null)
                e.TextColor = Color.White;
            base.OnRenderItemText(e);
        }

        protected override void OnRenderArrow(ToolStripArrowRenderEventArgs e)
        {
            var tsMenuItem = e.Item as ToolStripMenuItem;
            if (tsMenuItem != null)
                e.ArrowColor = Color.White;
            base.OnRenderArrow(e);
        }
        protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
        {
            var tsMenuItem = e.Item as ToolStripMenuItem;
            if (tsMenuItem != null)
                e.Item.BackColor = Color.Black;
            base.OnRenderMenuItemBackground(e);
        }
    }
    public class LeftMenuColorTable : ProfessionalColorTable
    { 
        public override Color MenuItemSelected
        {
            // when the menu is selected
            get { return ColorTranslator.FromHtml("#494f52");  }
        }

        public override Color ToolStripBorder
        {
            get { return ColorTranslator.FromHtml("#FFFFFF"); }
        }
        public override Color ToolStripDropDownBackground
        {
            get { return Color.White; }
        }
    }

    internal void SetTrayMenu()
    {
        if (m_menu != null)
            if (notifyIcon.ContextMenuStrip != null)
                notifyIcon.ContextMenuStrip.Refresh();

        m_menu = new ContextMenuStrip();
        m_menu.Renderer = new ArrowRenderer();
        m_menu.AllowTransparency = true;
        m_menu.Opacity = 0.8;

        m_menu.BackColor = Color.Black;
}

Answer 1

因为ToolStripDropDownMenu that hosts/lists the sub items or DropDownItems is not the same object that the ContextMenuStrip inherits. Hence you need to apply the same settings for each sub menu or DropDown。

SetTrayMenu()应该做的：

internal void SetTrayMenu()
{
    if (m_menu != null && notifyIcon.ContextMenuStrip != null)
        //Why?
        notifyIcon.ContextMenuStrip.Refresh();
    else
    {
        m_menu = new ContextMenuStrip
        {
            Renderer = new ArrowRenderer(),
            AllowTransparency = true,
            Opacity = 0.8,
        };

        foreach (var dd in m_menu.Items.OfType<ToolStripMenuItem>()
            .Where(x => x.HasDropDown))
        {
            var ddm = dd.DropDown as ToolStripDropDownMenu;

            if (ddm != null)
            {
                ddm.AllowTransparency = true;
                ddm.Opacity = 0.8;
            }
        }

        m_menu.BackColor = Color.Black;
    }
}

之前

之后

^{注：此处不透明度=0.5。}

更改 ToolStrip 子菜单的透明度

Change transparency for ToolStrip submenu

c#

toolstrip

contextmenustrip

winforms