RE: Need a ListBox of controls
- From: v-lliu@xxxxxxxxxxxxxxxxxxxx (Linda Liu[MSFT])
- Date: Mon, 30 Jun 2008 10:54:33 GMT
Hi David,
I suggest that you draw the ListBox by yourself to get what you want. To do
this, set the DrawMode property of the ListBox to OwnerDrawFixed or
OwnerDrawVariable and then override the OnMeasureItem and OnDrawItem and
OnMouseClick methods.
The following is a sample:
public class MyListBox : ListBox
{
List<bool> list = new List<bool>();
int itemHeight = 15;
int checkboxWidth = 20;
int imageWidth = 10;
bool initialize = true;
public delegate void ItemEventHandler(int itemindex);
public delegate void ItemCheckEventHandler(int itemindex,
CheckState state);
public event ItemCheckEventHandler ItemCheckBoxClicked ;
public event ItemEventHandler ItemImageClicked;
public event ItemEventHandler ItemTextClicked;
protected void OnItemCheckBoxClicked(int index,CheckState state)
{
if (ItemCheckBoxClicked != null)
{
ItemCheckBoxClicked(index,state);
}
}
protected void OnItemImageClicked(int index)
{
if (ItemImageClicked != null)
{
ItemImageClicked(index);
}
}
protected void OnItemTextClicked(int index)
{
if (ItemImageClicked != null)
{
ItemTextClicked(index);
}
}
public MyListBox()
{
this.DrawMode = DrawMode.OwnerDrawVariable;
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
if (DesignMode) return;
if (initialize)
{
for (int i = 0; i < this.Items.Count; i++)
{
list.Add(false);
}
initialize = false;
}
CheckBoxState state;
if (list[e.Index])
{
state = CheckBoxState.CheckedNormal;
}
else
{
state = CheckBoxState.UncheckedNormal;
}
e.DrawBackground();
CheckBoxRenderer.DrawCheckBox(e.Graphics, new
Point(e.Bounds.Left + 1, e.Bounds.Top + 1), state);
e.Graphics.DrawImage(Properties.Resources.Image1, new
Point(e.Bounds.Left + checkboxWidth, e.Bounds.Top + 1));
using (Font f = new Font(this.Font, FontStyle.Underline))
{
e.Graphics.DrawString(this.Items[e.Index].ToString(), f,
Brushes.Blue, new PointF(e.Bounds.Left + checkboxWidth + imageWidth,
e.Bounds.Top));
}
base.OnDrawItem(e);
}
protected override void OnMeasureItem(MeasureItemEventArgs e)
{
if (!DesignMode)
{
e.ItemHeight = itemHeight;
Size size =
TextRenderer.MeasureText(this.Items[e.Index].ToString(), this.Font);
e.ItemWidth = size.Width;
base.OnMeasureItem(e);
}
}
protected override void OnMouseClick(MouseEventArgs e)
{
int clickedIndex = -1;
clickedIndex = this.IndexFromPoint(e.Location);
if (clickedIndex != -1)
{
Rectangle checkboxRect = new Rectangle(0, clickedIndex *
itemHeight, checkboxWidth, itemHeight);
Rectangle imageRect = new Rectangle(checkboxWidth,
clickedIndex * itemHeight, imageWidth, itemHeight);
Size size
=TextRenderer.MeasureText(this.Items[clickedIndex].ToString(),this.Font);
Rectangle textRect = new Rectangle(checkboxWidth +
imageWidth,clickedIndex *ItemHeight,size.Width,itemHeight);
if (checkboxRect.Contains(e.Location))
{
list[clickedIndex] = !list[clickedIndex];
this.Invalidate();
if (list[clickedIndex])
{
this.OnItemCheckBoxClicked(clickedIndex,
CheckState.Checked);
}
else
{
this.OnItemCheckBoxClicked(clickedIndex,
CheckState.Unchecked);
}
}
else if (imageRect.Contains(e.Location))
{
this.OnItemImageClicked(clickedIndex);
}
else if (textRect.Contains(e.Location))
{
this.OnItemTextClicked(clickedIndex);
}
}
base.OnMouseClick(e);
}
}
Use the derived ListBox instead of the standard ListBox on your form and
subscribe the ItemCheckBoxClicked, ItemImageClicked and ItemTextClicked
events of the derived ListBox control.
As you can see, in the above solution I don't actually add a CheckBox or a
LinkLabel into each item of the ListBox, instead, I only draw them by
myself to mimc the appearance and behavior.
In fact, it's more easy to get what you want in WPF. You can add any UI
element into the items of a System.Windows.Controls.ListBox control
conveniently using a DataTemplate.
In your scenario, you can create a custom WPF control derived from the
System.Windows.Controls.ListBox class and then use the custom control on a
form in a WinForm application through the
System.Windows.Forms.Integration.ElementHost class.
Hope this helps.
If you have any question, please feel free to let me know.
Sincerely,
Linda Liu
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