问题描述
我想实现一个.NET窗体控件类似于组合框的功能,但我不知道正确的方法在任何地方拦截鼠标事件的形式,对未展开的项目列表。
I'm trying to implement a .net form control with functionality similar to a combo box, but I don't know the proper method to intercept mouse events anywhere on the form to un-expand the list of items.
我如何起价响应鼠标事件,而列表中正在显示p $ pvent其他控制?
How do I prevent other controls from responding to mouse events while the list is being shown?
我如何高效,安全地搭上了鼠标点击事件的任何地方的形式,隐藏展开的列表?
How do I efficiently and safely catch a mouse click event to anywhere on the form, to hide the expanded list?
推荐答案
只需使用 ToolStripControlHost
随着 ToolStripDropDown
,和它的工作就像组合框
下拉。你会不会担心处理的鼠标事件。
Just use a ToolStripControlHost
along with the ToolStripDropDown
, and it will work just like the ComboBox
dropdown. You won't have to worry about handling the mouse events.
我以前用过这样的:
Private Sub ShowControl(ByVal fromControl As Control, ByVal whichControl As Control)
'\\ whichControl needs MinimumSize set:'
whichControl.MinimumSize = whichControl.Size
Dim toolDrop As New ToolStripDropDown()
Dim toolHost As New ToolStripControlHost(whichControl)
toolHost.Margin = New Padding(0)
toolDrop.Padding = New Padding(0)
toolDrop.Items.Add(toolHost)
toolDrop.Show(Me, New Point(fromControl.Left, fromControl.Bottom))
End Sub
快速演示与窗体上的一个按钮控件:
Quick Demo with a Button control on a form:
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
ShowControl(Button1, New MonthCalendar)
End Sub
要回答你的标题问题,我的认为的的的的PInvoke的和的用于处理这种类型的功能释放捕获。
To answer the question in your title, I think the pinvoke calls of SetCapture and Release Capture are used to handle that type of functionality.
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