当 RenderMode 为“系统"时，ToolStripMenuItem 无法显示复选标记和图像(图标)? [英] ToolStripMenuItem can't show checkmark and Image (icon) when RenderMode is "System"?

问题描述

我的 Windows 窗体应用程序有一个 MenuStrip 并且一些菜单项 (ToolStripMenuItem) 有一个图标(设置 ToolStripMenuItem.Image 属性).

My Windows Forms application has a MenuStrip and some of the menu items (ToolStripMenuItem) have an icon (setting the ToolStripMenuItem.Image property).

当MenuStrip的RenderMode属性设置为ToolStripRenderMode.System时，当Checked 或 CheckOnClick 属性为 true 且菜单项有一个图标.

When the RenderMode property of the MenuStrip is set to ToolStripRenderMode.System, the checkmark doesn't display when the Checked or CheckOnClick property is true and the menu item has an icon.

当我将 MenuStrip.RenderMode 属性切换为 ToolStripRenderMode.Professional 或 ToolStripRenderMode.RenderManagerMode 时，它确实显示.

It does display when i switch the MenuStrip.RenderMode property to ToolStripRenderMode.Professional or ToolStripRenderMode.RenderManagerMode.

不幸的是，这是一个问题，因为我的应用需要:

Unfortunately, this is a problem because my app requires:

1. 选取框模式下的 ProgressBar，因此需要 Application.EnableVisualStyles() 才能使其正常工作.
2. 该应用程序需要平面"视觉样式，我通过省略对 Application.EnableVisualStyles() 的调用并保留默认的 ToolStripRenderMode.RenderManagerMode 在菜单条.但后来我无法获得我的选取框 ProgressBar！
3. 将 RenderMode 设置为 ToolStripRenderMode.System 解决了外观要求，但取消了使用图标检查菜单项的能力.

1. A ProgressBar in marquee mode, so Application.EnableVisualStyles() is required to get this to work.
2. The app requires a "flat" visual style, which i accomplished by leaving out the call to Application.EnableVisualStyles() and leaving the default ToolStripRenderMode.RenderManagerMode on the MenuStrip. But then i can't get my marquee ProgressBar!
3. Setting the RenderMode to ToolStripRenderMode.System solves the look and feel requirement, but takes away the ability to have checked menu items w/icons.

有什么办法可以满足我的所有要求吗?我错过了什么吗?感谢您的关注.

Is there any way to satisfy all my requirements? Am i missing something? Thanks for looking.

推荐答案

哇，我难住了！现在我知道我必须在编写一些严肃的代码.

Wow, i stumped SO! Now i know i must be working on some serious code.

无论如何，答案是:通过创建一个继承自 ToolStripSystemRenderer 的类来实现您自己的 ToolStripRenderer.

Anyway, the answer is: implement your own ToolStripRenderer by creating a class that inherits from ToolStripSystemRenderer.

使用您自己的代码覆盖绘制项目的方法.这是我专门寻找的用于绘制选中项的内容.它会检查 ToolStripMenuItem 是否没有图像.

Override the methods that draw the items with your own code. Here's what i was looking for specifically that draws the checked item. It draws a check if there's no image for the ToolStripMenuItem.

protected override void OnRenderItemCheck(ToolStripItemImageRenderEventArgs e)
{
    base.OnRenderItemCheck(e);
    if (e.Item.Selected)
    {
        Rectangle rect = new Rectangle(3, 1, 20, 20);
        Rectangle rect2 = new Rectangle(4, 2, 18, 18);
        SolidBrush b = new SolidBrush(Color.FromArgb(49, 106, 197));
        SolidBrush b2 = new SolidBrush(Color.Orange);

        e.Graphics.FillRectangle(b, rect);
        e.Graphics.FillRectangle(b2, rect2);
        e.Graphics.DrawImage(e.Image, new Point(5, 3));
    }
    else
    {
        Rectangle rect = new Rectangle(3, 1, 20, 20);
        Rectangle rect2 = new Rectangle(4, 2, 18, 18);
        SolidBrush b = new SolidBrush(Color.FromArgb(49, 106, 197));
        SolidBrush b2 = new SolidBrush(Color.Orange);

        e.Graphics.FillRectangle(b, rect);
        e.Graphics.FillRectangle(b2, rect2);
        e.Graphics.DrawImage(e.Image, new Point(5, 3));
    }
}

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