C# 如何检测鼠标是否在整个窗体和子控件内？
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How to detect if the mouse is inside the whole form and child controls?
提问by rfgamaral
I need to detect when the user moves the mouse over the Form and all its child controls and also when it leaves the Form. I tried the MouseEnterand MouseLeaveevents of the Form, I tried the WM_MOUSEMOVE& WM_MOUSELEAVEand WM_NCMOUSEMOVE& WM_NCMOUSELEAVEpairs of windows messages but none seem to work as I want...
我需要检测用户何时将鼠标移到 Form 及其所有子控件上，以及何时离开 Form。我尝试了窗体的MouseEnter和MouseLeave事件，我尝试了WM_MOUSEMOVE&WM_MOUSELEAVE和WM_NCMOUSEMOVE&WM_NCMOUSELEAVE对 Windows 消息，但似乎没有一个像我想要的那样工作......
Most of my Form is occupied by child controls of many sorts, there's not much client area visible. This means that if I move the mouse very quickly the mouse movement will not be detected, although the mouse is inside the Form.
我的大部分表单都被各种子控件占用，没有多少客户区可见。这意味着如果我非常快速地移动鼠标，则不会检测到鼠标移动，尽管鼠标在窗体内。
For instance, I have a TextBox that is docked at the bottom and between the desktop and the TextBox, there's only a very small border. If I quickly move the mouse from the bottom into the TextBox, the mouse movement won't be detected, but the mouse is inside the TextBox, therefore, inside the Form.
例如，我有一个文本框，它停靠在桌面和文本框的底部和之间，只有一个非常小的边框。如果我将鼠标从底部快速移动到 TextBox 中，则不会检测到鼠标移动，但鼠标在 TextBox 内，因此，在 Form 内。
How can I achieve what I need?
我怎样才能达到我所需要的？
采纳答案by TcKs
You can hook the main message loop and preprocess/postprocess any (WM_MOUSEMOVE) message what you want.
您可以挂钩主消息循环并根据需要预处理/后处理任何 (WM_MOUSEMOVE) 消息。
public class Form1 : Form {
private MouseMoveMessageFilter mouseMessageFilter;
protected override void OnLoad( EventArgs e ) {
base.OnLoad( e );
this.mouseMessageFilter = new MouseMoveMessageFilter();
this.mouseMessageFilter.TargetForm = this;
Application.AddMessageFilter( this.mouseMessageFilter );
}
protected override void OnClosed( EventArgs e ) {
base.OnClosed( e );
Application.RemoveMessageFilter( this.mouseMessageFilter );
}
class MouseMoveMessageFilter : IMessageFilter {
public Form TargetForm { get; set; }
public bool PreFilterMessage( ref Message m ) {
int numMsg = m.Msg;
if ( numMsg == 0x0200 /*WM_MOUSEMOVE*/) {
this.TargetForm.Text = string.Format( "X:{0}, Y:{1}", Control.MousePosition.X, Control.MousePosition.Y );
}
return false;
}
}
}
回答by NascarEd
How about this: In your form's OnLoad, recursively go through all of the child controls (and their children) and hook up the MouseEnter event.
怎么样：在表单的 OnLoad 中，递归遍历所有子控件（及其子控件）并连接 MouseEnter 事件。
Then whenever the mouse enters any descendant, the event handler will be called. Similarly, you could hook up MouseMove and/or MouseLeave events.
然后每当鼠标进入任何后代时，将调用事件处理程序。同样，您可以连接 MouseMove 和/或 MouseLeave 事件。
protected override void OnLoad()
{
HookupMouseEnterEvents(this);
}
private void HookupMouseEnterEvents(Control control)
{
foreach (Control childControl in control.Controls)
{
childControl.MouseEnter += new MouseEventHandler(mouseEnter);
// Recurse on this child to get all of its descendents.
HookupMouseEnterEvents(childControl);
}
}
回答by fkerrigan
On your user control create a mousehover Event for your control like this, (or other event type) like this
在您的用户控件上为您的控件创建一个鼠标悬停事件，（或其他事件类型）像这样
private void picBoxThumb_MouseHover(object sender, EventArgs e)
{
// Call Parent OnMouseHover Event
OnMouseHover(EventArgs.Empty);
}
On your WinFrom which hosts the UserControl have this for the UserControl to Handle the MouseOver in your Designer.cs
在承载 UserControl 的 WinFrom 上，UserControl 可以在 Designer.cs 中处理 MouseOver
this.thumbImage1.MouseHover += new System.EventHandler(this.ThumbnailMouseHover);
Which calls this method on your WinForm
在您的 WinForm 上调用此方法
private void ThumbnailMouseHover(object sender, EventArgs e)
{
ThumbImage thumb = (ThumbImage) sender;
}
Where ThumbImage is the type of usercontrol
其中 ThumbImage 是用户控件的类型
回答by Defkon1
Quick and dirty solution:
快速而肮脏的解决方案：
private bool MouseInControl(Control ctrl)
{
return ctrl.Bounds.Contains(ctrl.PointToClient(MousePosition));
}
