CODEWITHSUNDEEP
c#
JokerMartini
JokerMartini

Reputation: 6147

c# Custom control click event

I've made a custom control and I want to add a click event so when the user clicks anywhere on the control it will return the position of where the user has clicked on the control. For example if the user clicks in the middle of the bar it would essentially return me enough information for me to calculate 50% and that the user has clicked in the middle. 

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;
using System.Drawing.Drawing2D;

namespace CustomRangeBar
{
    public partial class RangeBar : UserControl
    {
        public RangeBar()
        {
            InitializeComponent();
            label1.ForeColor = Color.Black;
            this.ForeColor = SystemColors.Highlight; // set the default color the rangeBar
            this.Click += new EventHandler(RangeBar_Click); 
        }

        protected float percent = 0.0f; // Protected because we don't want this to be accessed from the outside
        // Create a Value property for the rangeBar
        public float Value
        {
            get
            {
                return percent;
            }
            set
            {
                // Maintain the value between 0 and 100
                if (value < 0) value = 0;
                else if (value > 100) value = 100;
                percent = value;
                label1.Text = value.ToString();
                //redraw the rangeBar every time the value changes
                this.Invalidate();
            }
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Brush b = new SolidBrush(this.ForeColor); //create brush that will draw the background of the range bar
            // create a linear gradient that will be drawn over the background. FromArgb means you can use the Alpha value which is the transparency
            LinearGradientBrush lb = new LinearGradientBrush(new Rectangle(0, 0, this.Width, this.Height), Color.FromArgb(255, Color.White), Color.FromArgb(50, Color.White), LinearGradientMode.Vertical);

            // calculate how much has the rangeBar to be filled for 'x' %
            int width = (int)((percent / 100) * this.Width);
            e.Graphics.FillRectangle(b, 0, 0, width, this.Height);
            e.Graphics.FillRectangle(lb, 0, 0, width, this.Height);
            b.Dispose(); lb.Dispose();
        }

        private void RangeBar_SizeChanged(object sender, EventArgs e)
        {
            // maintain the label in the center of the rangeBar
            label1.Location = new Point(this.Width / 2 - 21 / 2 - 4, this.Height / 2 - 15 / 2);
        }

    }
}

public void RangeBar_Click(object obj, EventArgs ea)
{
    // This get executed if the pictureBox gets clicked
    label1.text = "Increment 1";
}

Upvotes: 0

Views: 2109

Answers (1)

Scott Chamberlain
Scott Chamberlain

Reputation: 127563

OnClick is not a good function to override or subscribe to because it does not tell you the position where the click happened which is what you are looking for.

What you want is OnMouseClick which includes the x,y of the click point.

protected override void OnMouseClick(MouseEventArgs e)
{
    int x = e.X;
    int y = e.Y;

    //Do your calculation here.
}

Upvotes: 2

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