CODEWITHSUNDEEP
c#winformslistview
Cory
Cory

Reputation:

Drawing an Image to a subItem in the ListView

My Listview is setup in the details view with the following column headers:

Image Name || Image Location || Image Size || Image Preview

I would like to know if there is a way to draw an image in the 4th column there. The only way I know, is to set

this.listview1.OwnerDraw = true
this.listView1.DrawColumnHeader += new System.Windows.Forms.DrawListViewColumnHeaderEventHandler(listView1_DrawColumnHeader);
this.listView1.DrawItem += new System.Windows.Forms.DrawListViewItemEventHandler(listView1_DrawItem);
this.listView1.DrawSubItem += new System.Windows.Forms.DrawListViewSubItemEventHandler(listView1_DrawSubItem);

The problem with this is I have to handle ALL the listview drawing myself... I was wondering if there is a better way to draw in image to a subItem, or if there is a way to only handle the DrawSubItem event?

Upvotes: 5

Views: 19791

Answers (4)

Grammarian
Grammarian

Reputation: 6882

ObjectListView (an open source wrapper around a .NET WinForms ListView) trivially supports drawing images in columns without having to do all the owner drawing yourself. The Data tab of the demo shows animated GIFs, which is a bit OTT but it will work equally well with static images.

With a few lines of code, this is what your ListView can look like: alt text
(source: sourceforge.net)

Upvotes: 3

zidane
zidane

Reputation: 632

In listView1_DrawColumnHeader and listView1_DrawItem event handlers you should put this

e.DrawDefault = true;

It will use default drawing implementation for columns and items, all you have to do is write your own implementation only for subitems.

Upvotes: 1

CrazyTim
CrazyTim

Reputation: 7314

Building upon previous answers, here's a full VB.NET example:

Public Class MyListView : Inherits System.Windows.Forms.ListView

Public Sub New()
    MyBase.New()
    MyBase.OwnerDraw = True
End Sub

Protected Overrides Sub OnDrawSubItem(ByVal e As DrawListViewSubItemEventArgs)
    If x Then ' condition to determine if you want to draw this subitem
        ' draw code goes here
    Else
        e.DrawDefault = True
    End If
    MyBase.OnDrawSubItem(e)
End Sub

Protected Overrides Sub OnDrawColumnHeader(ByVal e As DrawListViewColumnHeaderEventArgs)
    e.DrawDefault = True
    MyBase.OnDrawColumnHeader(e)
End Sub

Protected Overrides Sub OnDrawItem(e As System.Windows.Forms.DrawListViewItemEventArgs)
    e.DrawDefault = True
    MyBase.OnDrawItem(e)
End Sub

End Class

Upvotes: 0

Jon Seigel
Jon Seigel

Reputation: 12401

I just ran into this.

@zidane's answer is nearly correct. I want to post what actually needs to be done so people reading back later don't have to figure this out themselves.

Only handle DrawColumnHeader using e.DrawDefault = true; and the subitem drawing. In fact, if you set e.DrawDefault = true; in the DrawItem event, the DrawSubItem event never fires, presumably on the assumption that you want to draw the whole row and don't care about the subitems.

The only real code is in DrawSubItem, using this basic construction:

if (/* condition to determine if you want to draw this subitem */)
{
    // Draw it
}
else
    e.DrawDefault = true;

Upvotes: 8

Related Questions