Turn listview results into hyperlinks

Question

i want to turn every result returned in Arr[2] into a hyperlink. I got no real idea where to start.

    public void TransactionLogSell()
    {

        listView1.View = View.Details;
        listView1.GridLines = true;
        listView1.FullRowSelect = true;

        listView1.Columns.Add("Buy Order Only", 97);
        listView1.Columns.Add("Amount", 95);
        listView1.Columns.Add("Transaction ID", 100);



        string[] arr = new string[3];
        ListViewItem item;

        string URT = "https://api.eveonline.com/char/WalletTransactions.xml.aspx?keyID=4602486&&vCODE=BHGVeXQkRLKLkIkZQHdeyUxmUz9EfUwbvGzoc2eO4ZR8kRMYxk8PbD4LMwLF7BvH";
        XmlDocument XMLtrans = new XmlDocument();
        XMLtrans.Load(URT);
        XmlNodeList TRnodelist = XMLtrans.SelectNodes("/eveapi/result/rowset/row[@transactionType='sell']");
        foreach (XmlNode xmlnode in TRnodelist)
        {
            if (xmlnode.Attributes["transactionType"] != null)
                arr[0] = xmlnode.Attributes["transactionType"].InnerText;
            if (xmlnode.Attributes["price"] != null)
                arr[1] = xmlnode.Attributes["price"].InnerText;
            if (xmlnode.Attributes["transactionID"] != null)
                arr[2] = xmlnode.Attributes["transactionID"].InnerText;
            double amount = 0.0d;
            if (Double.TryParse(arr[1], NumberStyles.Currency, null, out amount))
            {
                arr[1] = amount.ToString("C3", CultureInfo.CreateSpecificCulture("ja-JP"));
            }
            item = new ListViewItem(arr);
            listView1.Items.Add(item);
        }
    }

i've tried the following;

    listView1.HotTracking = true;

This makes all my columns into hyperlinks.

Here is a picture also;

Note: When copying event code do not forget to hook up the events!

Answer 1

Here is an example. It gives user feedback by changing the mouse cursor; much simpler than painting the items.

private void listView1_MouseMove(object sender, MouseEventArgs e)
{
    ListViewHitTestInfo HI = listView1.HitTest(e.Location);
    if (HI.SubItem != null && HI.SubItem.Name == "Link")
         Cursor = Cursors.Hand;
    else Cursor = Cursors.Default;
}

private void listView1_MouseUp(object sender, MouseEventArgs e)
{
    ListViewHitTestInfo HI = listView1.HitTest(e.Location);
    if (HI.SubItem != null && HI.SubItem.Name == "Link")
        MessageBox.Show("You have clicked on " + HI.SubItem.Tag.ToString());
    // do your stuff instead!
}

For my test I have prepared a 3 column ListView like this:

for (int i = 0; i < 5; i++)
{
    ListViewItem lvi = new ListViewItem("I" + i);
    ListViewItem.ListViewSubItem lvsi = lvi.SubItems.Add("Link " + i);
    lvi.SubItems.Add("S" + i);
    lvsi.Name = "Link";
    lvsi.Tag  = "Test # " + i;
    listView1.Items.Add(lvi);
}

Note that I have given each SubItem in one Column both a Name and a Tag, to identify it and for holding data you can use.

Also note that MouseClick only works when clicking the 1st Column in a ListView; MouseDown and MouseUp always work..

To show the link items underlined and blue (while we're at it) you need to ownerdraw them. And to make the markup go away again you need to keep track. You would have to code all three DrawXXX events, mostly setting e.DrawDefault = true; Only in DrawSubItem you would do a check on the e.ColumnIndex to be your link column; I use the second column, i.e. index 1..

A quick example:

The blue link is shown because the mouse is over it; the mouse just isn't captured in the screenshot..

We declare a few helper variables:

int CurrHitRow = -1;
int LastHitRow = -1;
Point curMouse = Point.Empty;

We expand the MouseMove to keep track of the item under the cursor:

private void listView1_MouseMove(object sender, MouseEventArgs e)
{
    ListViewHitTestInfo HI = listView1.HitTest(e.Location);
    if (HI.SubItem != null && HI.SubItem.Name == "Link")
    {
        if (CurrHitRow != LastHitRow) LastHitRow = CurrHitRow;
        CurrHitRow = HI.Item.Index;
        if (LastHitRow >= 0 && CurrHitRow != LastHitRow) 
            listView1.Invalidate();
        Cursor = Cursors.Hand; 
    }
    else Cursor = Cursors.Default;
    curMouse = e.Location;
}

We add the boring events:

private void listView1_DrawColumnHeader(object sender, DrawListViewColumnHeaderEventArgs e)
{
    e.DrawDefault = true;
}

private void listView1_DrawItem(object sender, DrawListViewItemEventArgs e)
{
    e.DrawDefault = true;
}

And the not so boring one:

private void listView1_DrawSubItem(object sender, DrawListViewSubItemEventArgs e)
{
    if (e.ColumnIndex != 1) e.DrawDefault = true;
    else 
    {
        ListViewHitTestInfo HI = listView1.HitTest(curMouse);
        if (HI.Item == null) { e.DrawDefault = true; return; }
        bool showLink = e.SubItem.Text.Substring(0,4) == "Link" 
                     && e.Item.Index == HI.Item.Index;

        e.DrawBackground();
        using (Font font = new Font(listView1.Font, showLink ?
                                    FontStyle.Underline : FontStyle.Regular))
        {
            e.Graphics.DrawString(e.SubItem.Text, font, showLink ?
              SystemBrushes.HotTrack : SystemBrushes.ControlText, e.Bounds);
        }
    }
}

Finally we need to add this to the setup:

lvi.UseItemStyleForSubItems = false;

or else the separate DrawSubItem would not get called. Instead you could merge it with the DrawItem event..

Note that some folks greatly prefer TextRenderer.DrawText over Graphics.DrawString, see here for an example! But I never found the difference to be compelling..