Help in custom Class

falcon eyes · February 23rd, 2010, 04:17 PM

Help in custom Class

Hi Everybody
I made a simple project its idea as follow

i want to make a graphical object consist of filled rectangle which can be drawn on the screen and be able to move it any where on the screen. i created windows form and added

to it a new class which represents my graphical object and contains the following code

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace DrawObject
{
   public class MyObject
    {
        Point postion;
        Size size;
        Region objRegion;

       public MyObject()
        {
            postion = new Point(20, 30);
            size = new Size(30, 30);
            objRegion = new Region(new Rectangle(postion, size));

        }
        public void Draw(Graphics g)
            {
                g.FillRectangle(Brushes.Blue, postion.X, postion.Y, size.Width, size.Height);
                g.Dispose();
            }
        public Point Postion
            {
                get { return postion; }
                set { 
                        postion = value;
                        objRegion.Dispose();
                        objRegion = new Region(new Rectangle(postion, size));
                    }
            }
        public Size SizeObj
            {
                get { return size; }
                set { 
                        size = value;
                        objRegion.Dispose();
                        objRegion = new Region(new Rectangle(postion, size));
                    }
            }
    }
}

my question is how to make my class detect mouse click so that i can register any fn to mouse click event (i mean when i click on my graphic object)

Bob Bedell · February 23rd, 2010, 05:18 PM

Code:

public Form1()
{
   InitializeComponent();
   MyObject myObject = new MyObject();
   this.MouseClick += new MouseEventHandler(myObject.Handle_MouseClick);
}

Code:

public class MyObject
{
 public void Handle_MouseClick(object sender, System.Windows.Forms.MouseEventArgs e) 
 {
    // Do something.
 }
}

falcon eyes · February 24th, 2010, 04:38 AM

Thanx Bob Bedell
but your code make the whole form to respond to the mouse click not only my graphic object since you register a fn with the form mouse click event and i want only my object to respond to the mouse click on him

samjudson · February 24th, 2010, 04:53 AM

If you want you class to act like a user control (accepting mouse clicks etc) then you'll have to inherit from UserControl, or similar, and override the OnClick and OnPaint methods.

falcon eyes · February 24th, 2010, 04:31 PM

i will try your suggestion samjudson but is there any other method like using message filter

samjudson · February 24th, 2010, 05:32 PM

I'm not sure what you mean by message filters. Sounds like you are trying to make life harder for yourself. UserControl already has all the properties you need, Size, Location and BackColor.

Code:

public class MyObject : UserControl
{
  protected override OnClick(EventArgs e)
  {
    // Do what ever you want here

    base.OnClick(e);
  }
}

falcon eyes · February 25th, 2010, 05:53 AM

yes you are right,but i was trying also to learn about message filter class if someone know

samjudson · February 25th, 2010, 06:19 AM

What message filter class?

falcon eyes · February 26th, 2010, 07:25 AM

Quote:

Originally Posted by samjudson

What message filter class?

sorry it's not a class
It's an interface used to catch any event before it's redirected to the application and then do any action required and to use it you must create a class that built this interface

samjudson · February 26th, 2010, 11:47 AM

Yes, but unless I'm mistake C# and .Net don't work like that, at least not with Winforms.