Hy!
I would like to create an ObjectListView, where you can delete items with a ContextMenu.
So basicly I used to delete it by getting OLV.SelectedIndex, and then deleting from the list OLV is based on, and re-setting the OLV objects.
Then I realized, if I sort the OLV, then delete an item, it deletes another item, since the selected item index does not equals the index in the list.
With OLV CellRightClick event I can get the object behind the clicked item (e.Model),but I dont know how to pass it to the ContextMenu click event handler.
Subjects is a List.
private void subjectListView_CellRightClick(object sender, BrightIdeasSoftware.CellRightClickEventArgs e)
{
if (subjectsListView.SelectedIndex != -1)
{
ContextMenu cm = new ContextMenu();
cm.MenuItems.Add("Delete", new EventHandler(DeleteItem));
subjectsListView.ContextMenu = cm;
}
}
void DeleteItem(object sender, EventArgs e)
{
//get the Subject object, which was clicked on
Subjects.RemoveAt(subjectsListView.SelectedIndex);
subjectsListView.SetObjects(Subjects);
}
So basically I want to get the object (not the index) when the ContextMenus "Delete" item is clicked.
Also, I feel like there is an easier way to do this.
Thanks for the answer.
I would just assign an appropriate ContextMenuStrip from the designer to the ObjectListView.ContextMenuStrip property and then handle the click of the corresponding "Delete" click like this:
private void deleteToolStripMenuItem_Click(object sender, EventArgs e) {
if (objectListView1.SelectedObject != null) {
objectListView1.RemoveObject(objectListView1.SelectedObject);
}
}
Or is there a requirement I am missing from your question?
Related
I am working with a datagrid in WPF which is bound to a collectionviewsource. The viewsource is bound to an observable collection named Rows.
The datagrid has add and delete functions which function properly except on small problem.
Here are images:
The datagrid has more data than this. Each test starts off with two sequences (the two rows you see belong to a single test) and they are grouped and sorted by a unique ID.
I have clicked the red "X" to delete the row. I will now click the "Add" button located at the top-left of the image.
The data is still there.
These are my add and delete functions:
private void Add(object sender, ExecutedRoutedEventArgs e)
{
var testRun = e.Parameter as TestRun;
if (testRun != null)
{
var numberOfRows = testRun.Property.GetValue("numberOfRows").ToNullable<int>().GetValueOrDefault(2);
numberOfRows++;
testRun.Property.SetValue("numberOfRows", numberOfRows.ToString());
this.Rows.Add(new ESCHandle(testRun, numberOfRows));
}
}
private void Delete(object sender, ExecutedRoutedEventArgs e)
{
var esc = e.Parameter as ESCHandle;
if (esc != null)
{
this.Rows.Remove(esc);
var numberOfRows = esc.TestRun.Property.GetValue("numberOfRows").ToNullable<int>().GetValueOrDefault(2);
numberOfRows--;
esc.TestRun.Property.SetValue("numberOfRows", numberOfRows.ToString());
}
}
The ESC object is properly removed from the observablecollection on Delete. But on when I add another ESC object/row to the colleciton and datagrid, the data is somehow copied to the new object.
You may forget to call a refresh method on datagrid to update its visual elements, such as the rows.
Datagrid.Items.Refresh(), as described here:
http://programmer.wrighton.org/2009/01/wpf-datagrid-items-refresh.html
This problem may be caused because PropertyChange is not raised properly.
how can I get the clicket elevent from a ListView which has the IsItemClickEnabled enabled?
I know how to get the selected Item/Index but not the clicked item.
ItemClick is working but I can not say s.th. like:
Object selection = listView1.SelectedItem;
EDIT:
I have a ListView and I need to catch the clicked item from this list in the following method:
private void listView1_ItemClick(object sender, ItemClickEventArgs e)
{
...
}
I may be missing something, but doesn't the following work for you?
private void lv_ItemClick_1(object sender, ItemClickEventArgs e)
{
var item = e.ClickedItem as String;
}
Here I assume the items in the list are simple strings, but in general they'll be whatever type you are using in the collection you've bound to the ItemsSource property of the ListView.
I guess you can also try the SelectionChanged event, and get the clicked item as e.AddedItems or MyListView.SelectedItem or MyListView.SelectedItems.
I want to select item in a ListView upon clicking. I also want to know what I clicked.
I work on winforms with c#.I also want to know How I can clicking the all row?
Just handle the Click event on the list and use the ListView.SelectedItems property to get what items are selected:
private void listView1_Click(object sender, EventArgs e)
{
var firstSelectedItem = listView1.SelectedItems[0];
}
u can use MouseEventArgs and get the mouse location check if it exists inside the selected item bound , that means the click was made on the selected item .
EDIT :
example :
private void myList_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (myList.SelectedItems.Count >= 1)
{
ListViewItem item = myList.SelectedItems[0];
//here i check for the Mouse pointer location on click if its contained
// in the actual selected item's bounds or not .
// cuz i ran into a problem with the ui once because of that ..
if (item.Bounds.Contains(e.Location))
{
MessageBox.Show("Double Clicked on :"+item.Text);
}
}
}
also if you use xaml for window then you must add MouseUp="listView1_Click" attribute to ListView tag
I've got a ListBox with a bunch of items in it. The user can click an item to edit its contents. How do I prevent the user from deselecting all items? i.e., the user shouldn't be able to have nothing selected.
There is a case missing in your situation, which is when the list is cleared you will reselect an item there is no longer on the list. I solve this by adding an extra check.
var listbox = ((ListBox)sender);
if (listbox.SelectedItem == null)
{
if (e.RemovedItems.Count > 0)
{
object itemToReselect = e.RemovedItems[0];
if (listbox.Items.Contains(itemToReselect))
{
listbox.SelectedItem = itemToReselect;
}
}
}
I then put this inside a behaviour.
I'm not sure if there is a direct way to disable deselecting an Item, but one way which would be transparent to the user is to keep track of the last selected Item, and whenever the SelectionChanged event is raised and the selected index is -1, then reselect the last value.
This Works for Sure to Prevent User from Deselect... Add those 2 Events to your checkedListBox1 and set the Property CheckOnClick to "True" in Design Mode. (MSVS2015)
private void checkedListBox1_SelectedValueChanged(object sender, EventArgs e)
{
checkedListBox1.SetItemChecked(checkedListBox1.SelectedIndex, true);
}
private void checkedListBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
checkedListBox1.SetItemChecked(checkedListBox1.SelectedIndex, true);
}
To disable on or more options in your listbox/dropdown, you can add the "disabled" attribute as shown below. This prevent the user from selection this option, and it gets a gray overlay.
ListItem item = new ListItem(yourvalue, yourkey);
item.Attributes.Add("disabled","disabled");
lb1.Items.Add(item);
One solution, as suggested by amccormack:
private void hostsListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if(lstHosts.SelectedItem == null)
{
if(e.RemovedItems.Count > 0)
{
lstHosts.SelectedItem = e.RemovedItems[0];
}
I have two list views. In the Item command event of the first Listview i am showing the second list view in modal popup using ajaxtoolkit.
protected void lvSelection_ItemCommand(object sender, ListViewCommandEventArgs e)
{
this.lvPopup.Visible = true;
this.lvPopup.DataSource = linqdataSource;
this.lvPopup.DataBind();
this.mdlPopup.Show();
}
Now in the itemcommand event of the second list view I need to change the content of the selected item in the first listview.
Is it possible to do that?
protected void lvPopup_ItemCommand(object sender, ListViewCommandEventArgs e)
{
// Set the text of the first list view item to the selected item
// of the second list view.
lstView1.Items[lstView1.SelectedIndex].Text =
lstView2.Items[lstView2.SelectedIndex].Text
}
I'd think that if you were to set the CommandName of the selector button in the first ListView to "Select" - from the second list view's ItemCommand event, you should be able to alter either the SelectedItemTemplate or the current item for the selected item in the first list.
protected void lvPopup_ItemCommand(object sender, ListViewCommandEventArgs e)
{
lvSelection.SelectedItemTemplate = "<div>woohoo!</div>";
// OR...
lvSelection.Items[lvSelection.SelectedIndex].SkinID = "SomeNewSkinForExample";
mdlPopup.Hide();
}
Have you already tried to dynamically generate the items of the List?
On the event code of the 1st list, clear the Items from the 2nd list and populate it with whatever logic suits you.