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C# Windows app. Increase the height of a multiline textbox to show all text entered

Posted on 2010-09-13
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Last Modified: 2013-12-17
Hi

I am new to C# so apologies if this is a silly question.

I have a windows form with a series of textboxes for data input.  A few of them are multiline.  I need to expand the height of the multiline text box to show all the data that has been input without a scrollbar.

I will also need to move all the controls below the adjusted text box down the form to a new position to avoid overlap.

Any sample code or help would be great!

Thanks in advance!
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Question by:greep
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6 Comments
 
LVL 3

Expert Comment

by:ghayasurrehman
ID: 33660776
set textbox property textBox1.Multiline = True

just drag and drop your controls where you want
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LVL 16

Expert Comment

by:kris_per
ID: 33661037

One option is to use 'TableLayoutPanel' in the designer which will automatically push the controls down.
Add a TableLayoutPanel to the form in the designer.
Arrange the textboxes and other controls in the rows of that table.
when you increase the height of a multiline textbox, increase the height of the table row as well (like tableLayoutPanel1.RowStyles[i].Height += 30). This will automatically push all the controls in the rows below down.

Another option is to programatically change the Location of the controls as shown in the code below.

public void MoveControlsBelow(Control control, int moveHeight)
        {
            foreach (Control c in this.Controls)
            {
                if (c != control)
                {
                    if (c.Location.Y >= control.Location.Y)
                    {
                        c.Location = new Point(c.Location.X, c.Location.Y + moveHeight);
                    }
                }
            }
        }

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LVL 16

Accepted Solution

by:
kris_per earned 2000 total points
ID: 33661117

I am not sure if you are alreading changing the height of the multiline textbox to fit all the lines of the text; If not, try with the code below:

// Below code will keep increasing the height of the textbox as
// required as user types in the textbox and will push other 
// controls down.

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            TextBox textBox = sender as TextBox;
            if (textBox != null)
            {
                int prevHeight = textBox.Height;
                int newHeight = (int)( (textBox.Lines.Length+1) * (textBox.Font.GetHeight() + 3));
                if (newHeight > prevHeight)
                {
                    textBox.Height = newHeight;

                    int heightChange = textBox.Height - prevHeight;
                    MoveControlsBelow(textBox, heightChange);
                }
            }
        }



public void MoveControlsBelow(Control control, int moveHeight)
        {
            foreach (Control c in this.Controls)
            {
                if (c != control)
                {
                    if (c.Location.Y >= control.Location.Y)
                    {
                        c.Location = new Point(c.Location.X, c.Location.Y + moveHeight);
                    }
                }
            }
        }

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LVL 16

Expert Comment

by:Vikram Singh Saini
ID: 33665192
I agree with Kris per's solution. That is the best answer.

Regards,
VSS
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Author Closing Comment

by:greep
ID: 33669971
Thanks!  Much appreciated!
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