increase the height of each item displayed in CheckedListBox in window form

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hi all,

i have a checkedlistbox in windows form which gets data from database
i want to increse the row height if each item of checkedlistbox.

any idea.

Posted 1-Aug-11 8:05am

suniltikli

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Praveen Kullu · Answer 1 · 2011-08-01T08:43:00

Solution 1

This one works:

C#

int height =0, index =0;
        private void button1_Click(object sender, EventArgs e)
        {
            checkedListBox1.Items.Add("new");
            height += checkedListBox1.GetItemHeight(index); //Add height of item added to checklistbox
            if(checkedListBox1.Height< height)
            {
                checkedListBox1.Size = new Size(checkedListBox1.Width, checkedListBox1.Height + checkedListBox1.GetItemHeight(0));
            }
         index++;
        }

Posted 1-Aug-11 8:43am

Praveen Kullu

Updated 1-Aug-11 8:56am

v2

Comments

suniltikli 1-Aug-11 14:51pm

it will actuall increase the height of checkedlistbox control but i need to increase the height of item row of checkedlistbox

Praveen Kullu 1-Aug-11 14:58pm

I don't get it. Please show me your code for this.

suniltikli 1-Aug-11 15:10pm

for ex there r 3 items rows in my checkedlistbox as following : -
item row 1 = Country1
item row 2 = Country2
item row 3 = Country3
i want the first item row height should be 30, secound item row height should be 20 and 3rd item row height should be 15 in the checkedlistbox.

Praveen Kullu 1-Aug-11 15:29pm

Sorry, can't help you. Perhaps creating a custom checkedlistbox would do it.

Dougie the P · Answer 2 · 2015-02-26T19:48:00

This works in VS2013 net FrameWork4.5

Put declare and constant at top of class

Usage put rest of code in Form_Load as in example code.

VB

Private Declare Function SendMessageByNum Lib "user32" Alias "SendMessageA" _
  (ByVal hwnd As IntPtr, ByVal wMsg As UInt32, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

Private Const lB_SETITEMHEIGHT As Integer = &H1A0

Private Sub Form_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim ItemHeight As Integer = Me.Font.Height + 4
    SendMessageByNum(CheckedListBoxControl.Handle, lB_SETITEMHEIGHT, CType(0, IntPtr), CType(ItemHeight, IntPtr))

End Sub

Joan Magnet · Answer 3 · 2015-02-26T21:27:00

Set the DrawMode to OwnerDrawVariable and add a handler event for DrawItem and OnMeasureItem

C#

ListBox1.DrawMode = DrawMode.OwnerDrawVariable;
ListBox1.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);

C#

protected override void OnMeasureItem(MeasureItemEventArgs e)
{
    e.ItemHeight = xxx;
    this.DropDownHeight = xxx * 5; // if you use borders
}


private void ListBox1_DrawItem(object sender,
    System.Windows.Forms.DrawItemEventArgs e)
{
    e.DrawBackground();

    // set the size of the item and draw it
    //
    e.Graphics.DrawString(ListBox1.Items[e.Index].ToString(),
        e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
}

You'll find a lot of samples.

increase the height of each item displayed in CheckedListBox in window form

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