一个控件中的多个 MouseHover 事件 [英] Multiple MouseHover events in a Control

问题描述

我正在尝试在 C# 中实现自定义控件，我需要在鼠标悬停时获取事件.我知道有 MouseHover 事件，但它只触发一次.要让它再次触发，我需要拿起控件的鼠标并再次输入.

I'm trying to implement a custom control in C# and I need to get events when the mouse is hovered. I know there is the MouseHover event but it only fires once. To get it to fire again I need to take the mouse of the control and enter it again.

有什么办法可以做到这一点吗?

Is there any way I can accomplish this?

推荐答案

让我们将停止移动"定义为在 n 毫秒内保持在 x 像素半径内".

Let's define "stops moving" as "remains within an x pixel radius for n ms".

订阅 MouseMove 事件并使用计时器(设置为 n ms)来设置超时.每次鼠标移动时，检查公差.如果超出您的容忍范围，请重置计时器并记录新的原点.

Subscribe to the MouseMove event and use a timer (set to n ms) to set your timeout. Each time the mouse moves, check against the tolerance. If it's outside your tolerance, reset the timer and record a new origin.

伪代码:

Point lastPoint;
const float tolerance = 5.0;

//you might want to replace this with event subscribe/unsubscribe instead
bool listening = false;

void OnMouseOver()
{
    lastpoint = Mouse.Location;
    timer.Start();
    listening = true; //listen to MouseMove events
}

void OnMouseLeave()
{
    timer.Stop();
    listening = false; //stop listening
}

void OnMouseMove()
{
    if(listening)
    {
        if(Math.abs(Mouse.Location - lastPoint) > tolerance)
        {
            //mouse moved beyond tolerance - reset timer
            timer.Reset();
            lastPoint = Mouse.Location;
        }
    }
}

void timer_Tick(object sender, EventArgs e)
{
    //mouse "stopped moving"
}

这篇关于一个控件中的多个 MouseHover 事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！