using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace DataGridResize_CS
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.DataGrid dataGrid1;
private System.Windows.Forms.Label label1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form 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.dataGrid1 = new System.Windows.Forms.DataGrid();
this.label1 = new System.Windows.Forms.Label();
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
this.SuspendLayout();
//
// dataGrid1
//
this.dataGrid1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right);
this.dataGrid1.DataMember = "";
this.dataGrid1.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(16, 24);
this.dataGrid1.Name = "dataGrid1";
this.dataGrid1.Size = new System.Drawing.Size(304, 244);
this.dataGrid1.TabIndex = 0;
this.dataGrid1.SizeChanged += new System.EventHandler(this.dataGrid1_SizeChanged);
//
// label1
//
this.label1.Location = new System.Drawing.Point(64, 8);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(224, 16);
this.label1.TabIndex = 1;
this.label1.Text = "Size the form to size the grid.";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 13);
this.ClientSize = new System.Drawing.Size(336, 278);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label1,
this.dataGrid1});
this.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private int headerWidth; //width of row header
private int nCols; //number of columns in teh datatable
private void Form1_Load(object sender, System.EventArgs e)
{
//get a datatable somehow
DataTable dt = new DataTable("MyTable");
this.nCols = 4;
int nRows = 7;
for(int i = 0; i < nCols; i++)
dt.Columns.Add(new DataColumn(string.Format("Col{0}", i)));
for(int i = 0; i < nRows; ++i)
{
DataRow dr = dt.NewRow();
for(int j = 0; j < nCols; j++)
dr[j] = string.Format("rrrr{0} cccc{1}", i, j);
dt.Rows.Add(dr);
}
//add a table style so the columnstyles can be accessed
DataGridTableStyle ts = new DataGridTableStyle();
ts.MappingName = "MyTable";
this.dataGrid1.TableStyles.Add(ts);
this.dataGrid1.DataSource = dt;
//this.DataGrid1.RowHeadersVisible = false;
//trick to know the header width of the row header
this.headerWidth = this.dataGrid1.GetCellBounds(0, 0).X;
//call to a routine that will equally size the columns in the client area
SizeEqually(this.dataGrid1.TableStyles["MyTable"]);
}
//make columns equally occupy grid's client area
private void SizeEqually(DataGridTableStyle ts)
{
if (ts == null)
return;
//get a reference to the GridColumnStyles
GridColumnStylesCollection colStyles = ts.GridColumnStyles;
//get the target width
int width = this.dataGrid1.Size.Width - this.headerWidth - 4; // the 4 handles the borders
if(IsScrollBarVisible(this.dataGrid1))
width -= SystemInformation.VerticalScrollBarWidth;
int lastColIndex = this.nCols - 1;
//set to zero so horizontal scroll does not show as your size
//frees up room in case leading cols grid during resize and try to flash teh HScroll
colStyles[lastColIndex].Width = 0;
int colWidth = width / nCols;
int rowWidth = 0;
DataTable dt = (DataTable)this.dataGrid1.DataSource;
Graphics g = Graphics.FromHwnd(dataGrid1.Handle);
StringFormat sf = new StringFormat(StringFormat.GenericTypographic);
SizeF size = SizeF.Empty;
for(int i = 0; i < lastColIndex; i++)
{
for(int n = 0; n < dt.Rows.Count; n++)
{
size = g.MeasureString(dataGrid1[n, i].ToString(), dataGrid1.Font, 500, sf);
if (size.Width > rowWidth)
{
rowWidth = (int)size.Width;
}
}
if (rowWidth > colWidth)
{
colStyles[i].Width = rowWidth;
}
else
{
colStyles[i].Width = colWidth;
}
}
//make last col fit whatever is left (handles pixels lost to int division
colStyles[lastColIndex].Width = width - (nCols - 1) * colWidth;
}
private void dataGrid1_SizeChanged(object sender, System.EventArgs e)
{
SizeEqually(this.dataGrid1.TableStyles["MyTable"]);
}
private bool IsScrollBarVisible(Control aControl)
{
foreach(Control c in aControl.Controls)
{
if (c.GetType().Equals(typeof(VScrollBar)))
{
return c.Visible;
}
}
return false;
}
}
}