I need to take an action when a control is added to a TableLayoutPanel in Windows Forms. I am handling ParentChanged event of the control to find out if the control is added to a parent(here TableLayoutPanel), but the index I receive is -1.
TableLayoutPanel t;
private void button1_Click(object sender, EventArgs e)
{
// this.Text = tableLayoutPanel1.Height.ToString();
t = new TableLayoutPanel();
t.Dock = DockStyle.Fill;
//t.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
t.AutoSize = true;
//t.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
t.RowStyles.Add(new RowStyle(SizeType.AutoSize));
t.RowStyles.Add(new RowStyle(SizeType.AutoSize));
t.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
t.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
panel1.Controls.Add(t);
t.CellBorderStyle = TableLayoutPanelCellBorderStyle.Single;
Label lbl = new Label();
lbl.ParentChanged += new EventHandler(lbl_ParentChanged);
lbl.Margin = new System.Windows.Forms.Padding(20, 150, 20, 20);
lbl.Text = "Hello";
t.Controls.Add(lbl, 0, 0);
}
void lbl_ParentChanged(object sender, EventArgs e)
{
Label lbl = (Label)sender;
int row = t.GetRow(lbl);//here I get row = -1 ??????
}
I need row number to which the control is added. The control should take action independent of when it is added to the TableLayoutPanel. How to get it ?
void t_ControlAdded(object sender, ControlEventArgs e)
{
int row = t.GetRow(e.Control); //this also gives row = -1
}
You need to increment RowCount/ColumnCount
, if you add new RowStyles/ColumnStyles
to your TableLayoutPanel
. After this you can easily use the GetPositionFromControl(Control value)
Method.
I think, ControlAdded
Event is the better approach in this case. Give it a try.
Do it like this:
public partial class Form1 : Form
{
private TableLayoutPanel panel;
public Form1()
{
InitializeComponent();
InitializeTableLayoutPanel();
}
private void Form1_Load(object sender, EventArgs e)
{
AddControl(0, 0);
AddControl(0, 1);
AddControl(1, 0);
AddControl(1, 1);
AddControl(2, 0);
AddControl(2, 1);
AddControl(3, 0);
AddControl(3, 1);
}
private void InitializeTableLayoutPanel()
{
panel = new TableLayoutPanel();
panel.Dock = DockStyle.Fill;
panel.AutoSize = true;
panel.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
panel.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
panel.ColumnCount = 2;
panel.RowStyles.Add(new RowStyle(SizeType.AutoSize));
panel.RowStyles.Add(new RowStyle(SizeType.AutoSize));
panel.RowCount = 2;
panel.CellBorderStyle = TableLayoutPanelCellBorderStyle.Single;
panel.ControlAdded += new ControlEventHandler(OnControlAdded);
this.Controls.Add(panel);
}
private void OnControlAdded(object sender, ControlEventArgs e)
{
if (e.Control != null)
{
int column = panel.GetPositionFromControl(e.Control).Column;
int row = panel.GetPositionFromControl(e.Control).Row;
MessageBox.Show(string.Format("Column: {0}, Row: {1}", column, row));
}
}
/// <summary>
/// Add Control to Panel
/// </summary>
/// <param name="column">column position</param>
/// <param name="row">row position</param>
private void AddControl(int column, int row)
{
Label label = new Label();
label.Font = new Font(new FontFamily("Droid Sans"), 20, FontStyle.Bold);
label.Name = "label";
label.Text = "Whoop!";
if (column < panel.ColumnCount && row < panel.RowCount)
panel.Controls.Add(label, column, row);
else
throw new ArgumentOutOfRangeException();
}
}