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FriendFeedEdit ListView SubItems
Posted
by Ronny Frister
on July 16th, 2009
This example explains an easy way to edit ListView subitems. A double click on the ListView.SubItem will visualize a TextBox overlaying the SubItem with same size. The entered signs will be written to the SubItem after TextBox_LostFocus event was raised (by clicking on the ListView control or hit RETURN key).
The following Visual Basic code is to be inserted into a form (e.g. MainForm). The Form contains a TextBox, Button and ListView control. TextBox and Button are hidden ([control].Visible = False)
For the listview the following settings apply:
- set ListView.FullRowSelect = True
- set ListView.GridLines = True
- set ListView.Details = True
Remark: The LostFocus will not be raised if you click on the form. It will be called when you click on another control such as the ListView.
The Code
'declare a global variable to store the column index
Private selCol As Integer
'create ListView structure during FormLoad Event
Private Sub MainForm_Load(ByVal sender As
System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
ListView42.Clear()
ListView42.Columns.Add("Category")
ListView42.Columns.Add("Monday")
ListView42.Columns.Add("Tuseday")
ListView42.Columns.Add("Wednesday")
ListView42.Columns.Add("Thursday")
ListView42.Columns.Add("Friday")
ListView42.Columns.Add("Satturday")
ListView42.Columns.Add("Sunday")
ListView42.Columns.Add("Average")
'load criteria column
values into list view
ListView42.Items.Add("quiet")
ListView42.Items.Add("light")
ListView42.Items.Add("medium")
ListView42.Items.Add("intensive")
ListView42.Items.Add("heavy")
'create subitems
'set the Tags for
later identification of clicked subitem(index)
For a = 0 To
ListView42.Items.Count - 1
For c = 1 To
ListView42.Columns.Count - 1
ListView42.Items(a).SubItems.Add(a & c).Tag = a & c
Next
Next
End Sub
Private Sub ListView42_MouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles
ListView42.MouseDoubleClick
'detect clicked subitem
/ column
Dim hit As
ListViewHitTestInfo = ListView42.HitTest(e.X, e.Y)
For Each
lItem As ListViewItem In ListView42.Items
If lItem.Selected = True Then
For a = 0 To
lItem.SubItems.Count
If hit.SubItem.Tag = lItem.SubItems(a).Tag Then
selCol = a
'prevent edit on first column
If selCol = 0 Then Exit Sub
'dim size and location of the TextBox
'TextBox.FontSize maybe 1 bigger than that of
'Listview Items to get the users eye catched on
it.
TextBox42.Left = ListView42.Left +
hit.SubItem.Bounds.Left + 3
TextBox42.Top = ListView42.Top +
hit.SubItem.Bounds.Top
TextBox42.Width = hit.SubItem.Bounds.Width
TextBox42.Text = hit.SubItem.Text
'set TextBox to visible for user input
TextBox42.Visible = True
TextBox42.Focus()
TextBox42.SelectAll()
Exit For
End If
Next
End If
Next
End Sub
Private Sub
TextBox42_KeyPress(ByVal sender As Object, ByVal
e As
System.Windows.Forms.KeyPressEventArgs) Handles TextBox42.KeyPress
'call LostFocus Sub
in the event user pressed RETURN
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
TextBox42_LostFocus(sender, Nothing)
End If
End Sub
Private Sub
TextBox42_LostFocus(ByVal sender As Object, ByVal
e As
System.EventArgs) Handles TextBox42.LostFocus
Dim selDetail As String
'hide textbox
TextBox42.Visible = False
'load old value to
detect if there is a change
selDetail = ListView42.SelectedItems(0).SubItems(selCol).Text
'change the subitem.text
only if the new value is different to
the existing one
'to prevent display
of the save butten without changing values
If selDetail <> TextBox42.Text Then
ListView42.Items(ListView42.SelectedItems(0).Index).SubItems(selCol).Text =
TextBox42.Text
'set
change flag for not stored information to prevent loss
of update by change of selection
'changeFlage
= True
btnSave.Visible = True
End If
'do not clear the
TextBox.Text, dueto LostFocus Sub may be
called twice
'(e.g. click mouse
on a control different as the ListView)
'else the list subitem.text
will be overwritten again by an
empty string
End Sub
Comments
An easier method for cell edit in listviews
Posted by andlov on 09/30/2009 10:10pmThanks, an nice article. The idea to use HitTest really pushed me in the right direction. However, the code can be simplified by letting the listview be the textbox parent. Because hitinfo contains an reference to the actual listview cell object, it can be used direct if we share it between the two event handlers. No need to calculate the textbox position (C# code, details omitted): private ListViewHitTestInfo hitinfo; private TextBox editbox = new TextBox(); public FormMain() { editbox.Parent = listView; editbox.Hide(); editbox.LostFocus += new EventHandler(editbox_LostFocus); listView.MouseDoubleClick += new MouseEventHandler(listView_MouseDoubleClick); listView.FullRowSelect = true; } private void listView_MouseDoubleClick(object sender, MouseEventArgs e) { hitinfo = listView.HitTest(e.X, e.Y); editbox.Bounds = hitinfo.SubItem.Bounds; editbox.Text = hitinfo.SubItem.Text; editbox.Focus(); editbox.Show(); } void editbox_LostFocus(object sender, EventArgs e) { hitinfo.SubItem.Text = editbox.Text; editbox.Hide(); } // Anders LC6vgren-
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Replyon click editable listview rows and cells
Posted by vahnar on 02/19/2013 06:41amthanks a lot after 10 days i successed through yor guide hope your more happy & success in ever
ReplyListViewSubItemsEdit
Posted by Adnan on 01/20/2013 03:52amHI andlov, Thanks a lot. Finally, I got the proper solution from u..
ReplyRE: Edit ListView SubItems
Posted by Taggic on 10/30/2009 03:10amHi Anders, sorry for my long absence here and very late reply. Possibly I've some time between xmas and new years day to update the posted code by your improvements. Thanks, Taggic
ReplyWhat is Globeseo.net?
Posted by lihuidaizi on 07/19/2009 04:30amThanks for sharing! www.globeseo.net, teach you how to earn money on the Internet!
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