确定一种形式是完全关闭屏幕 [英] Determining if a form is completely off screen

问题描述

我开发记住用户的喜好，以表格的最后位于屏幕里的应用程序。在某些情况下，用户将有它的次级屏幕上，然后再触发应用时没有所述第二屏幕（有时具有的形式出现断屏幕）。其他时候，用户会改变产生类似的效果予以解决。

I am developing an application that remembers the user's preferences as to where the form was last located on the screen. In some instances the user will have it on a secondary screen, and then fire the app up later without the second screen (sometimes having the form appear off screen). Other times the user will change their resolution resulting in a similar effect.

我希望做的Form_Shown事件处理此检查。基本上我想要确定表单是否完全关闭屏幕，所以我可以重新定位它。

I was hoping to do this checking in the Form_Shown event handler. Basically I want to determine whether the form is completely off screen so I can re-position it.

任何意见？

推荐答案

用此功能检查，如果表是完全在屏幕上：

check with this function if Form is fully on screen:

public bool IsOnScreen(Form form)
    	{
    		Screen[] screens = Screen.AllScreens;
    		foreach (Screen screen in screens)
    		{
    			Rectangle formRectangle = new Rectangle(form.Left,form.Top,form.Width, form.Height);

    			if (screen.WorkingArea.Contains(formRectangle))
    			{
    				return true;
    			}
    		}

    		return false;
    	}

检查仅左上点，如果它在屏幕上：

checking only TopLeft point if it's on screen:

public bool IsOnScreen(Form form)
    	{
    		Screen[] screens = Screen.AllScreens;
    		foreach (Screen screen in screens)
    		{
    			Point formTopLeft = new Point(form.Left, form.Top);

    			if (screen.WorkingArea.Contains(formTopLeft))
    			{
    				return true;
    			}
    		}

    		return false;
    	}

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