• Status: Solved
  • Priority: Medium
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Color public property of custom user control problem

I have created a partially working custom control that basically draws a grid of lines.

The two public color properties do not seem to work.

When I add the control to a new project, in the properties window, I select the color and the color does not change. After that first attempt, I cannot even select a color.

Attached is the code for the control, and at the bottom are the two color properties: 'BorderColor', and 'CellColor'
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
 
namespace gridCustomControl
{
    public partial class GridCustomControl : UserControl
    {
        private int _cols;
        private int _rows;
        private int _width;     // Cell width
        private int _height;    // Cell height
        private float _zoom;
        private Color _cellColor;
        private Color _borderColor;
 
        public GridCustomControl()
        {
            InitializeComponent();
 
            // The following SetStyles are needed for double buffering:
            SetStyle(ControlStyles.DoubleBuffer, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            SetStyle(ControlStyles.UserPaint, true);
 
            _cols = Cols;
            _rows = Rows;
            _width = CellWidth;
            _height = CellHeight;
            _cellColor = CellColor;
            _borderColor = BorderColor;
 
            this.ControlSize = new Size(_width * _cols, _height * _rows);
        }
 
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.FillRectangle(Brushes.White, this.ClientRectangle);
 
            int cellHeight = this.CellHeight;   
            int cellWidth = this.CellWidth; 
            int nbrColumns = this.Cols;
            int nbrRows = this.Rows;
 
            // Draw cells
            for (int row = 0; row < nbrRows; row++)
            {
                for (int col = 0; col < nbrColumns; col++)
                {
                    Point cellLocation = new Point(col * cellWidth, row * cellHeight);
                    Rectangle cellRect = new Rectangle(cellLocation.X,
                                                       cellLocation.Y,
                                                       cellWidth, cellHeight);
 
                    if (cellRect.IntersectsWith(e.ClipRectangle))
                    {
                        g.FillRectangle(new SolidBrush(_cellColor), cellRect);
                        g.DrawRectangle(new Pen(_borderColor, 1), cellRect);
                    }
                    else
                    {
                        // Do nothing...
                    }
                }
            }
            this.Invalidate(); // Redraw the whole control
        }
 
        [Browsable(true),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
 
        public int Cols
        {
            get { return _cols; }
            set { _cols = value; }
        }
 
        public int Rows
        {
            get { return _rows; }
            set { _rows = value; }
        }
 
        public int CellWidth
        {
            get { return _width; }
            set { _width = value; }
        }
 
        public int CellHeight
        {
            get { return _height; }
            set { _height = value; }
        }
 
        public float Zoom
        {
            get { return _zoom; }
            set { _zoom = value; }
        }
 
        public Size ControlSize
        {
            // This property references the 'this' because there
            // aren't any private members that need to be created
            // to hold the size value.
 
            get { return this.Size; }
            set 
            {
                _width = value.Width;
                _height = value.Height;
 
                // 1 is added otherwize the most very most right line and
                // the very most bottom line will not show.
                this.Size = new Size(_width * _cols + 1, _height * _rows + 1);
 
                this.Invalidate(); // Redraw the whole control
            }
        }
 
        public Color CellColor
        {
            get { return _cellColor; }
            set { _cellColor = value; }
        }
 
        public Color BorderColor
        {
            get { return _borderColor; }
            set { _borderColor = value; }
        }
    }
}

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yaronusa
Asked:
yaronusa
  • 5
1 Solution
 
Bob LearnedCommented:
Try this.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
 
public partial class GridControl : UserControl
{
    private int _cols = 3;
    private int _rows = 3;
    private int _width = 100;     // Cell width
    private int _height = 100;    // Cell height
    private float _zoom;
    private Color _cellColor = Color.White;
    private Color _borderColor = Color.Black;
 
    public GridControl()
    {
        // The following SetStyles are needed for double buffering:
        this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
 
        this.SetControlSize();
    }
 
    protected override void OnPaint(PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        g.FillRectangle(Brushes.White, this.ClientRectangle);
 
        int cellHeight = this.CellHeight;
        int cellWidth = this.CellWidth;
        int nbrColumns = this.Columns;
        int nbrRows = this.Rows;
 
        // Draw cells
        for (int row = 0; row < nbrRows; row++)
        {
            for (int col = 0; col < nbrColumns; col++)
            {
                Rectangle cellRect = new Rectangle(col * cellWidth, row * cellHeight, cellWidth, cellHeight);
 
                if (cellRect.IntersectsWith(e.ClipRectangle))
                {
                    g.FillRectangle(new SolidBrush(_cellColor), cellRect);
                    g.DrawRectangle(new Pen(_borderColor, 1), cellRect);
                }
                else
                {
                    // Do nothing...
                }
            }
        }
    }
 
    [Browsable(true),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
 
    public int Columns
    {
        get { return _cols; }
        set
        {
            _cols = value;
            this.SetControlSize();
        }
    }
 
    public int Rows
    {
        get { return _rows; }
        set
        {
            _rows = value;
            this.SetControlSize();
        }
    }
 
    public int CellWidth
    {
        get { return _width; }
        set
        {
            _width = value;
            this.SetControlSize();
        }
    }
 
    public int CellHeight
    {
        get { return _height; }
        set
        {
            _height = value;
            this.SetControlSize();
        }
    }
 
    public float Zoom
    {
        get { return _zoom; }
        set
        {
            _zoom = value;
            this.Invalidate();
        }
    }
 
    public void SetControlSize()
    {
        // 1 is added otherwize the most very most right line and
        // the very most bottom line will not show.
        this.Size = new Size(_width * _cols + 1, _height * _rows + 1);
 
        this.Invalidate(); // Redraw the whole control
    }
 
    [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public new Size Size
    {
        get { return base.Size; }
        set { base.Size = value; }
    }
 
    public Color CellColor
    {
        get { return _cellColor; }
        set
        {
            _cellColor = value;
            this.Invalidate();
        }
    }
 
    public Color BorderColor
    {
        get { return _borderColor; }
        set
        {
            _borderColor = value;
            this.Invalidate();
        }
    }
}

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yaronusaAuthor Commented:
I put your code in and got on error on the custom control designer:

The error is:

Error      1      'gridCustomControl.GridCustomControl.Dispose(bool)': no suitable method found to override      C:\Users\PMC TB3\Documents\Visual Studio 2005\Projects\gridCustomControl\gridCustomControl\GridCustomControl.Designer.cs      14      33      gridCustomControl

But I think one difference I see is that you put default values...
namespace gridCustomControl
{
    partial class GridCustomControl
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
 
        //ERROR ON THIS NEXT LINE:
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Component Designer generated code
 
        /// <summary>
        /// Required method for Designer support - do not modify 
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.SuspendLayout();
            // 
            // GridCustomControl
            // 
            this.Name = "GridCustomControl";
            this.Size = new System.Drawing.Size(300, 239);
            this.ResumeLayout(false);
 
        }
 
        #endregion
 
 
 
    }
}

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yaronusaAuthor Commented:
I also see that you do not call initialize component, I'm trying to implement your suggestions as I type this...
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yaronusaAuthor Commented:
OK, it worked! I'm sure you aren't TOO surprised though! Thanks for saving me a ton of time...

I would have told it worked sooner, but my internet connection went down and I actually drove to Kinkos to make sure you weren't continuing to figure it out... THANK YOU!
0
 
yaronusaAuthor Commented:
I tried to distribute the points... but I get this message:

Notice: The Asker has requested that this comment be accepted as the solution and the points be refunded to the Asker's account.

I'm assuming that is you and all is well... thanks again.
0
 
yaronusaAuthor Commented:
THANK YOU!!!!!!!!!!!
0
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