在窗口（和控件）之外绘制 [英] Paint out of window (and controls)

问题描述

我认为，如果我使用图像，那将是最好的：

I think that if I use image it would be best:

我需要将控件作为datetimepicker日历放在窗口之外。我正在使用 panelKalendar = new PanelDoubleBuffer（）; 然后在方法中： void panelKalendar_Paint（object sender，PaintEventArgs e）我画一切。但是它可以绘制到窗口并喜欢所有其他控件。如何获得DateTimePicker中使用的效果？

I need that my control could be out of window as datetimepicker calendar. I am using panelKalendar = new PanelDoubleBuffer(); then in method: void panelKalendar_Paint(object sender, PaintEventArgs e) I paint everything. But it´s painting to window and belov all other controls. How can I get "effect" that is use in DateTimePicker?

推荐答案

组合框的下拉列表（以及日历控件的下拉面板）可能是桌面的子窗口。那也是您必须做的：将控件嵌套在无边界表单中，并为该表单提供一个空父级，这样它就是一个顶层窗口，而不是应用程序窗口的子窗口。

The drop-down list of a combo box (and also possibly the drop-down panel of a calendar control) is a child window of the desktop. That's what you also have to do: nest your control inside a borderless form, and give that form a null parent, so that it is a top-level window, not a child of your application window.

由于您的表单将是顶级窗口，因此需要在屏幕坐标中而不是在表单本地坐标中指定其位置。您可以使用 PointToScreen 方法获得这些坐标。

Since your form will be a top-level window, its location will need to be specified in screen coordinates, not in coordinates local to your form. You can get those coordinates using the PointToScreen method.

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