mouseenter事件的边界？ [英] Boundaries for mouseenter event?

问题描述

我有一个名为Resistor的课程。是的，关于电子产品。但我还在试验。在它内部，在Paint事件中，我添加了一个rezistor.png和一些e.Graphics.FillRectangle颜色和文本的图像。

在这堂课中，我添加公共事件EventHandler MouseEnter;

从Form1我可以称之为罚款：

resistorx1.MouseEnter + = new EventHandler（resistorx1_MouseEnter）;



void resistorx1_MouseEnter（object sender，EventArgs e）

{

resistorx1 .text1 =gugu;

}

但是当我用鼠标在它上面运行后，注意到了。没有文字改变！



我想有些边界必须设置为能够感觉当鼠标在里面？我怎样才能做到这一点？ - 一个例子非常有用 - 谢谢。



我尝试过的事情：



a很多工作___________________

I have a class named Resistor. Yes, its about electronics. But I am experimenting, still. Inside it, in a Paint event,I add a image of a rezistor.png and some e.Graphics.FillRectangle colors and text.
In this class, I add "public event EventHandler MouseEnter;"
And from Form1 I can call it fine:
resistorx1.MouseEnter += new EventHandler(resistorx1_MouseEnter);

void resistorx1_MouseEnter(object sender, EventArgs e)
{
resistorx1.text1 = "gugu";
}
But noting is happening after I run with my mouse over it. No text changing!

I suppose some boundaries must be set to be able to "feel" when the mouse is inside ? How can I do that? - an example would help immensely - thank you.

What I have tried:

a lot of work ___________________

推荐答案

你不能只是添加一个事件并期望它自动连接 - 如果你想响应系统事件那么这个类需要是一个了解系统事件的人：一个UserControl。



我快速构建了一个，它可以工作。添加一个新的UserControl，将其命名为Resistor并将其CS代码设置为：

You can't just add an event and expect it to be automatically hooked up - if you want to respond to system events then the class needs to be one that knows about system events: a UserControl.

I quickly constructed one, and it works. Add a new UserControl, Call it "Resistor" and set it's CS code to this:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GeneralTesting
    {
    public partial class Resistor : UserControl
        {
        public Resistor()
            {
            InitializeComponent();
            Text = "100R";
            }

        private void Resistor_Paint(object sender, PaintEventArgs e)
            {
            e.Graphics.FillRectangle(Brushes.Pink, e.ClipRectangle);
            e.Graphics.DrawString(Text, Font, Brushes.Black, e.ClipRectangle);
            }

        private void Resistor_MouseEnter(object sender, EventArgs e)
            {
            Text = "Hello";
            Invalidate();
            }

        private void Resistor_MouseLeave(object sender, EventArgs e)
            {
            Text = "100R";
            Invalidate();
            }

        }
    }

在设计模式下删除我的表单，然后运行应用程序。当鼠标进入时，它会改变文本，当鼠标离开时，它会返回。

Drop one on my form in design mode, and run the app. when the mouse enters, it changes text, when the mouse leaves, it goes back.

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