ListView MouseUp Event

[Tom Bean]

I am trying to display a ContextMenuStrip when a user right-clicks on an
item in a ListView and have encountered a something that seems strange to
me.

When the ListView is initially populated, no items are selected. When the
first item is selected by clicking either the left or right button, the
SelectedIndexChanged event fires but not the MouseUp event. After the first
item is selected and another item clicked on, both the SelectedIndexChanged
and MouseUp events fire.

Since I am calling Show() for the context menu in the MouseUp event when the
right button is clicked, no context menu is displayed when the first
selection is made by right-clicking an item.

Can anyone tell me if it is normal behavior for the MouseUp event not to
fire when the first selection is made? Is there any way to ensure the
context menu is displayed for the first selection?

Thanks,
Tom

 

[zacks]

I am trying to display a ContextMenuStrip when a user right-clicks on an
item in a ListView and have encountered a something that seems strange to
me.

When the ListView is initially populated, no items are selected.  When the
first item is selected by clicking either the left or right button, the
SelectedIndexChanged event fires but not the MouseUp event.  After the first
item is selected and another item clicked on, both the SelectedIndexChanged
and MouseUp events fire.

Since I am calling Show() for the context menu in the MouseUp event when the
right button is clicked, no context menu is displayed when the first
selection is made by right-clicking an item.

Can anyone tell me if it is normal behavior for the MouseUp event not to
fire when the first selection is made?  Is there any way to ensure the
context menu is displayed for the first selection?

I cannot qanswer your question about the MouseUp event, but I am
wondering how come you are not using the "buildt in" method of showing
a context menu by setting the ListView's ContextMenu property?

 

[Tom Bean]

Quite frankly, I probably used the MouseUp event to show the the context
menu in some special case and just got in the habit of using it.

There is one notable difference between the way the context menu is shown
when the listview property is set and the way it shows using the MouseUp
event. When I removed the MouseUp event handler and let the listview show
the context menu, the context menu only appears when an item is selected
with a mouse button click and then the selected item is right-clicked. In
other words, it always behaves the way it does when the first item is
selected by a right-click. At least, letting the listview handle the context
menu offers consistent behavior.

I am trying to display a ContextMenuStrip when a user right-clicks on an
item in a ListView and have encountered a something that seems strange to
me.

When the ListView is initially populated, no items are selected. When the
first item is selected by clicking either the left or right button, the
SelectedIndexChanged event fires but not the MouseUp event. After the
first
item is selected and another item clicked on, both the
SelectedIndexChanged
and MouseUp events fire.

Since I am calling Show() for the context menu in the MouseUp event when
the
right button is clicked, no context menu is displayed when the first
selection is made by right-clicking an item.

Can anyone tell me if it is normal behavior for the MouseUp event not to
fire when the first selection is made? Is there any way to ensure the
context menu is displayed for the first selection?

I cannot qanswer your question about the MouseUp event, but I am
wondering how come you are not using the "buildt in" method of showing
a context menu by setting the ListView's ContextMenu property?

 

[Linda Liu[MSFT]]

Hi Tom,

I performed a test based on your description but didn't reproduce on my
side.

The steps of my test are as follows:
1. Create a WinForm application project in VS2005.
2. Add a ListView and a ContextMenuStrip on the form and add some items in
the ListView control.
3. Subscribe the ListView's MouseUp event in the form's constructor and
show the ContextMenuStrip in the MouseUp event handler.

The following is the code in the form:

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.listView1.MouseUp += new
MouseEventHandler(listView1_MouseUp);
}

void listView1_MouseUp(object sender, MouseEventArgs e)
{
this.contextMenuStrip1.Show(this.listView1, e.X, e.Y);
}
}

4. Build and run the application. When the form is shown, no item is
selected in the ListView.
5. Left-click or right-click one item in the ListView and the
ContextMenuStrip pops up. I get the same result when I run the application
on both Windows XP and Vista.

The version of VS I'm using is 8.0.50727.42. What's the version of the VS
you're using? What's the version of OS on which you run the application?

Sincerely,
Linda Liu
Microsoft Online Community Support

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[Tom Bean]

Linda,

I'm running VS 2008, version 9.0.21022.8 RTM. Did something change in VS
2008?

Regards,
Tom

 

[Linda Liu[MSFT]]

Hi Tom,

Thank you for your prompt reply!

I performed another test in VS2008, version 9.0.21022.8 RTM, but still
didn't reproduce the problem.

What's the OS version on which you run the application? You may have a try
running the application on another machine to see if the problem still
exists.

Sincerely,
Linda Liu
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Tom Bean]

Linda,

I'm running Windows XP Professional SP2 but if this is OS related, I can't
really test on another system because they are all running the same OS.

Thanks,
Tom

 

[Linda Liu[MSFT]]

Hi Tom,

Thank you for your quick reply!

I have performed tests on Windows XP Professional SP2, but didn't reproduce
the problem on it.

If you handle the ListView's MouseDown event instead of the MouseUp event,
does the problem still exist?

Sincerely,
Linda Liu
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Tom Bean]

Linda,

I had set the ContextMenuStrip property for the ListView and was also trying
to open the context menu in the MouseUp event handler. I thought these two
methods might be interferring with one another so I tried them one at a
time.

First, I tried commenting out the MouseUp event handler and letting the
ListView handle the context menu as was suggested in zacks' reply to my
initial post and the behavior I see is:
1) a right-click on an unselected item only selects it (no context menu
opens)
2) a right-click on a selected item opens the context menu.

This happens consistently. Is this the expected behavior?

Next, I tried only handling the context menu with the MouseUp event and a
right-click on a selected item opens the context menu, however, after
selecting another item and left-clicking on the previously selected item,
sometimes the context menu opened. It is like one or more MouseUp events
were being handled out of sequence.

In my application, when an item is selected in the ListView, data is
retrieved from a database and used to populate various controls on the
UserControl which causes focus to be removed from the ListView. Could this
cause the mouse events to be sent to the other controls, thereby, causing
the mouse events to be out of sequence?

If so, would the problem be resolved by setting the focus back to the
ListView after populating the other controls?

Thanks,
Tom

 

[Linda Liu[MSFT]]

Hi Tom,

Thank you for your quick response and detailed information!

This happens consistently. Is this the expected behavior?

I didn't reproduce this problem on my side. Every time I right-click on an
unselected or selected item, the context menu is always opened.

If so, would the problem be resolved by setting the focus back to the

ListView after populating the other controls?

It would be better if you could send me a simple project that could
reproduce the problem you describe. To get my actual email address, remove
'online' from my displayed email address.

Sincerely,
Linda Liu
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Tom Bean]

Linda,

This is the same user control we corresponded about after my post on 3/24.
I could never get drag & drop to work properly and this problem is regarding
implementing copy/paste via a context menu to replace the drag & drop.

I am convinced there is too much going on when an item is selected, e.g.
retrieving data from SQL Server, populating controls... This is compounded
by the fact that my list view is instantiated from derived ListView class to
extend the ListView functionality.

I never could get the context menu to open with a single right-click when I
set the ContextMenuStrip property of the list view, however, it is working
now with the MouseUp event handler. Frankly, I changed so many things I'm
not sure what finally got it working.

Thanks for your help.

Tom

 

[Linda Liu[MSFT]]

Hi Tom,

Thank you for your prompt reply!

Do you mean that you have made some changes in your project and the problem
disappears finally?

If the problem appears again or you still need our assistance, please feel
free to let me know.

Thank you for using our MSDN Managed Newsgroup Support Service!

Sincerely,
Linda Liu
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Tom Bean]

Linda,

Yes, the context menu seems to be working now. I'm not really sure why but
it's good enough for now.

Thanks,
Tom

 

[Linda Liu[MSFT]]

Hi Tom,

Thank you for your response!

I will close this issue since the problem disappears now. But if the
problem appears later, please feel free to reopen this issue and I will
continute to work with you.

Thank you for using our MSDN Managed Newsgroup Support Service!

Sincerely,
Linda Liu
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

This posting is provided "AS IS" with no warranties, and confers no rights.