MDI子表单不显示阴影效果 [英] Shadow effect is not showing for MDI Child Form

问题描述

Hi Team，



$
我将MDI子表格（表格2）放在MDI容器表格内（ Form1），我试图使用下面的代码为父表单添加阴影效果.b

受保护的覆盖CreateParams CreateParams 
 {
 get 
 {
 CreateParams cp = base.CreateParams; 
 cp.ClassStyle | = 0x00020000; 
返回cp; 
} 
} 

但它不适用于MDI儿童表格。

关心，



Aiswarya

解决方案

< blockquote>

请参阅https://docs.microsoft.com/en-us/windows/desktop/winmsg/window-class-styles

CS_DROPSHADOW

0x00020000

在窗口上启用阴影效果。通过
SPI_SETDROPSHADOW 打开和关闭效果。通常，这对于诸如菜单之类的小的短期窗口来说是启用的，以强调它们与其他窗口的Z顺序关系。从具有此样式的类创建的Windows必须是顶级窗口;他们
可能不是子窗口。

MDI子窗口不是顶级窗户。所以它不能有影子。

Hi Team,


I am having an MDI Child Form(Form2) placed inside a MDI container Form(Form1), I tried to added shadow effect to the child form using the below code which worked for parent form.

protected override CreateParams CreateParams
		{
			get
			{
				CreateParams cp = base.CreateParams;
				cp.ClassStyle |= 0x00020000;
				return cp;
			}
		}

But it didn't work for MDI Child Form.

Regards,

Aiswarya

解决方案

See https://docs.microsoft.com/en-us/windows/desktop/winmsg/window-class-styles

CS_DROPSHADOW

0x00020000

Enables the drop shadow effect on a window. The effect is turned on and off through SPI_SETDROPSHADOW. Typically, this is enabled for small, short-lived windows such as menus to emphasize their Z-order relationship to other windows. Windows created from a class with this style must be top-level windows; they may not be child windows.

A MDI child window is no a top-level windows. So it can't have a shadow.

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