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05.06.2008 at 05:00PM PDT, ID: 23381294
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Raising events on windows forms

Asked by korhanacar in Microsoft Visual C#.Net

Tags: Microsoft, C#, .NET 3.5, C#, Raising events on windows forms

Well the thing is I'm in the middle of learning how to raise my own events but I got stuck.

I already understand the delegates and the events, and I'm trying to create an object with an "OnMouseHover" event, what I'm doing is I'm drawing a square on the Form and after that would come that if the mouse is hovering on it (depending on it's drawing point) it would raise the OnMouseHover event, but I don't know where to do that. I mean there must be something continiouslly going on so it can raise the event as soon as the mouse enters the square. Anyways, the code is bellow. I know there's something missing to raise the CheckMouseHover method when the mouse does hover the square, but I don't have the slightest idea of what it is.

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this is the form
 
public partial class Form1 : Form
    {
        MySquare s = new MySquare(new Point(50, 50), Color.Red, new Size(50, 50));
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            s.OnMouseHover += new MouseMoveEventHandler(s_OnMouseHover);
        }
 
        void s_OnMouseHover(object o, MouseMoveEventArgs e)
        {
            MessageBox.Show("Mouse hovering");   
        }
 
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            s.Draw(e);
        }
    }
 
this is the class
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
 
namespace CustomStuff
{
    delegate void MouseMoveEventHandler(object o, MouseMoveEventArgs e);
 
    class MySquare
    {
        private Point _point;
        private Color _color;
        private Size _size;
 
        public event MouseMoveEventHandler OnMouseHover;
 
        public MySquare(Point point, Color color, Size size)
        {
            this._point = point;
            this._color = color;
            this._size = size;
        }
 
        public void Draw(PaintEventArgs e)
        {
            Rectangle square = new Rectangle(this._point, this._size);
            Form1 form = new Form1();
 
            Graphics g = e.Graphics;
 
            g.FillRectangle(Brushes.Red, square);
 
            Pen p = new Pen(this._color);
            
            g.DrawRectangle(p, square);
            p.Dispose();
        }
 
        private void CheckMouseHoverEvent(object o, MouseMoveEventArgs e)
        {
            if (OnMouseHover != null)
            {
                OnMouseHover(o, e);
            }
        }
    }
 
    class MouseMoveEventArgs : EventArgs
    {
        private readonly int posX;
        private readonly int posY;
 
        public MouseMoveEventArgs(int posX, int posY)
        {
            this.posX = posX;
            this.posY = posY;
        }
    }
}
 
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[+][-]05.06.2008 at 06:01PM PDT, ID: 21512379

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[+][-]05.07.2008 at 09:11AM PDT, ID: 21517869

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[+][-]05.08.2008 at 02:38PM PDT, ID: 21528698

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About this solution

Zone: Microsoft Visual C#.Net
Tags: Microsoft, C#, .NET 3.5, C#, Raising events on windows forms
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Solution Provided By: TheLearnedOne
Participating Experts: 1
Solution Grade: A
 
 
[+][-]05.08.2008 at 02:40PM PDT, ID: 21528711

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