Hello,
I run into trouble move down a selected item in a listbox. The code moving
down the item is the following one:
for (int j = lv.SelectedItem s.Count-1; j >=0; j--)
{
ListViewItem moveItem = lv.SelectedItem s[j];
selIdx = moveItem.Index;
// ignore movedown of last item
if(selIdx==lv.I tems.Count-1)
return false;
// move the subitems for the next row
// cache so we can move the selected row down
for(int i=0; i < lv.Items[selIdx].SubItems.Count ; i++)
{
cache = lv.Items[selIdx + 1].SubItems[i].Text;
lv.Items[selIdx + 1].SubItems[i].Text =
lv.Items[selIdx].SubItems[i].Text;
lv.Items[selIdx].SubItems[i].Text = cache;
}
lv.Items[selIdx+1].Selected=true;
lv.Items[selIdx].Selected = false;
}
Move a selected item with this code, the item lost all its information (the
information stored in the SubItems). It's strange. The debugger shows the
caching works, lv.Items[selIdx + 1].SubItems[i].Text and
lv.Items[selIdx].SubItems[i].Text have the expected data stored until the
step lv.Items[selIdx+1].Selected is executed. Then the moved item shows the
default values.
It is strange, isn't it? I found out if I change the order of the selection
/ deselection of the item,
lv.Items[selIdx].Selected = false;
lv.Items[selIdx+1].Selected=true;
the code works as expected.
I have no explaination for that. Can anyone explain me the reason,
lv.Items[selIdx+1].Selected=true;
lv.Items[selIdx].Selected = false;
does not work, but
lv.Items[selIdx].Selected = false;
lv.Items[selIdx+1].Selected=true;
works fine?
Thanks in advance.
Michael 3 1811
Michael,
Forgive me if I don't understand your problem completely, but I think you
wrote a lot of code for such a simple task.
Try the following code:
private void button1_Click(o bject sender, EventArgs e)
{
if (this.listView1 .SelectedIndice s.Count != 1)
return;
int selIndex = this.listView1. SelectedIndices[0];
if (selIndex == this.listView1. Items.Count - 1)
return;
ListViewItem item = this.listView1. SelectedItems[0];
this.listView1. Items.Remove(it em);
this.listView1. Items.Insert(se lIndex + 1, item);
}
This code makes assumption the the control doesn't support multiple
selection, but it can be easily rewritten to work with multiple selection
too.
"Michael Meckelein" <mi*****@go-on-line.de> wrote in message
news:44******** *************** @newsread2.arco r-online.net... Hello,
I run into trouble move down a selected item in a listbox. The code moving down the item is the following one:
for (int j = lv.SelectedItem s.Count-1; j >=0; j--) { ListViewItem moveItem = lv.SelectedItem s[j]; selIdx = moveItem.Index; // ignore movedown of last item if(selIdx==lv.I tems.Count-1) return false; // move the subitems for the next row // cache so we can move the selected row down for(int i=0; i < lv.Items[selIdx].SubItems.Count ; i++) { cache = lv.Items[selIdx + 1].SubItems[i].Text; lv.Items[selIdx + 1].SubItems[i].Text = lv.Items[selIdx].SubItems[i].Text; lv.Items[selIdx].SubItems[i].Text = cache; } lv.Items[selIdx+1].Selected=true; lv.Items[selIdx].Selected = false; }
Move a selected item with this code, the item lost all its information (the information stored in the SubItems). It's strange. The debugger shows the caching works, lv.Items[selIdx + 1].SubItems[i].Text and lv.Items[selIdx].SubItems[i].Text have the expected data stored until the step lv.Items[selIdx+1].Selected is executed. Then the moved item shows the default values.
It is strange, isn't it? I found out if I change the order of the selection / deselection of the item, lv.Items[selIdx].Selected = false; lv.Items[selIdx+1].Selected=true; the code works as expected.
I have no explaination for that. Can anyone explain me the reason, lv.Items[selIdx+1].Selected=true; lv.Items[selIdx].Selected = false; does not work, but lv.Items[selIdx].Selected = false; lv.Items[selIdx+1].Selected=true; works fine?
Thanks in advance.
Michael
Hi,
"Stoitcho Goutsev (100)" <10*@100.com> wrote in message
news:OO******** ******@TK2MSFTN GP09.phx.gbl... Michael,
Forgive me if I don't understand your problem completely, but I think you wrote a lot of code for such a simple task.
I think the same thing :)
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Stoitcho Goutsev (100)" wrote Michael,
Forgive me if I don't understand your problem completely, but I think you wrote a lot of code for such a simple task.
Try the following code: private void button1_Click(o bject sender, EventArgs e) { if (this.listView1 .SelectedIndice s.Count != 1) return;
int selIndex = this.listView1. SelectedIndices[0];
if (selIndex == this.listView1. Items.Count - 1) return;
ListViewItem item = this.listView1. SelectedItems[0]; this.listView1. Items.Remove(it em); this.listView1. Items.Insert(se lIndex + 1, item);
}
This code makes assumption the the control doesn't support multiple selection, but it can be easily rewritten to work with multiple selection too.
Hello Stoitcho Goutsev ,
Thanks for you help. You are right. Initial I try it the way you describe
and it did not work. However, I retried it and it works now. Didn't know
what caused the trouble in the past.
Here the code which supports multiple selection.
if (lv.SelectedIte ms.Count < 1)
return;
// we take the last selected item first and move it down.
for (int i = lv.SelectedItem s.Count-1; i >=0; i--)
{
ListViewItem moveItem = lv.SelectedItem s[i];
selIdx = moveItem.Index;
// ignore movedown of last item
if(selIdx==lv.I tems.Count-1)
return;
lv.Items.Remove (moveItem);
lv.Items.Insert (selIdx + 1, moveItem);
}
Once again, thx for your help.
Michael This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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