With the Listview in Details view:When showing a long (scrolling) list:Is there an (easy) way to return the index's of which range of items are currently visible in the control?
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I have a ListView which might contains a lot of items, so it is virtualized and recycling items. It does not use sort. I need to refresh some value display, but when there are too many items, it is too slow to update everything, so I would like to refresh only the visible items.How could I get a list of all currently displayed items ? I tried to look into the ListView or in the ScrollViewer, but I still have no idea... the solution must NOT go throught all items to test if they can be seen, because this would be too slow.I'm not sure code or xaml would be usefull, it is just a Virtualized/Recycling ListView with its ItemSource bound to an Array.
View 2 RepliesHow can I check if a ListView has items that are not in its visible area?
View 5 RepliesI've made an extended listview for my application but do get some strange behaviour when i scroll down and select an item.
This is the
Imports System.Windows.Forms
Public Class iListView
Inherits System.Windows.Forms.ListView
[CODE]...
The strange thing is that after scrolling up and down some items get visible again.
I'm a student and I have a small project to create for my VB class. For the personal touch, I tried using a ListView to manage a SQL database (on a remote web server).What I need to do right now is determine how many items are selected (if more than one, enable delete and edit buttons, if more than one, disable edit button). I searched a lot for that, but didn't find anything working with me.Do you know a simple way I could get the number of items that are selected in my ListView?
View 2 RepliesCan you determine a point in a target window is visible to the eye?
View 9 RepliesI have a tabcontrol which contain 4 tabpages. Each tabpage have a datagridview.
When i select any tabpage the datagridview of it will show.
I want to check what datagridview is showwing(visible) in button1 click event.
I dont want to loop through controls thenafter check visible propety of control.
ive just registered but ive been reading this forum before.I have a medium problem and an easy problem.
My project adds dates in runtime to a listbox.It can be any date inputed by the user so theres no way to know which date is at which position thats why the listbox index stuff for me is totally useless.Problem 1: if lets say a user types in a date into a textbox "27-03-2001, and press an "OK" button, i want to select that date automatically in the listbox if it exists.the only way ive found so far to programatically select an item is to use the index stuff which as i said is worthless for my situation as the comparison is a string,So, how can i select an item from the listbox using a string to item comparison?
Problem 2: Dates in the listbox are dd-mm-yyyy format so they dont arrange properly, is there anyway i can make the listbox sort the items counting from right to left instead of left to right? because that would solve my problem as it would be like inverting the date itself while sorting.
if you can answear any of these 2 problems please dont hesitate to comment about it, if its possible or not and if it is how i can do it.Both problems are at the same importance for me
How can i get the first visible item in a wpf listview (listview view is gridview).
View 5 RepliesIs there anyway to tell if a scroll bar is visible in a listview?
When I'M drawing the listviewitem, I need to know if the vertical scrollbar is visible so I can make sure to make my item's width smaller than it normally should be.
I use a listview control which is created at runtime because I don't need it visible to the user. I basically use it to store some information about paths, sort it and then pick out the data I need. It works very well apart from it doesn't seem to sort. For efficiency, I turn off sorting on the listview while the data is being added then enable sorting on the listview at the end. However, the sorting doesn't work. Is this because the listview isn't visible or am I just being daft?
View 18 RepliesHow can I access a Listview's subitem, (to change backcolor, text ,etc)I know the item & subitem index's...
View 7 Repliesi have a listview box full of items, image below:
when i click a button i would like a msgbox to pop up displaying how many are alive.
How would i do this ?
Also how would i remove all items that status is "Dead"
i made a media player program and i am having many problems! the main issue is that i have a listview that displays music playlist, how can i get it to navigate to the next item after the clicked one is over that way users don't have to click on the next one to continue their playlist?
View 14 RepliesHow can I save ALL of the items in a listview, items that were added by the user? I tried application Settings and tried creating a settings file but there is not a settings option for listview items.
View 8 RepliesI have a number of textboxes and labels in a panel which has to scroll in order to view them all. The user is then able to scroll down and click on one of the labels which has a textbox that appears so the user can change the corresponding value in the label. For some reason, if the user has to scroll down at all to any of the labels that are initially out of view, when they click on the label the textbox appears far below as if it was at its initial position and not directly where the label currently is.
View 11 Repliesim trying to make the listview sort the listview items by column (whichever column was clicked, sort the list based on that column)
in vb6 it was done by:
Private Sub ListView1_ColumnClick(ByVal ColumnHeader As MSComctlLib.ColumnHeader)
Static olditem&
With ListView1
[Code].....
Using VB.net 2010 i am trying to figure out if an item was selected or not. Reason being is that if the user clicks on an item and pushes a button then everything works just fine. However, if the user selects an item and then clicks on a blank spot on the bottom of the listview and then clicks the button then it crashes.
My code is this:
If (lstMaster.SelectedItems(0).SubItems(1).Text) Is Nothing Then
MsgBox("test")
End If
im trying to determine if there is an item selected on the listview..
i have a listview that displays customers name with a .tag that holds there ID.
how do you tell if the tag is 0 or empty before executing code?
[code..]
the code i want to execute if there is a tag (or atleast a listitem is selected) is down here.
Since I am making a program with quite a few users with different access levels, I usually turn all the toolstripmenuitems to visible false first, before turning some of them to visible true again as specific to the users.[code]...
View 3 Replies[PictureBox] [PictureBox] [PictureBox] [PictureBox] [PictureBox].
All of them have no images. Now. I want to make an item editor for the game I'm playing. To edit the items, You have to place an ini file in the game's directory with the template below:
Quote:
[ItemSet1]
SetName=Set1
RecItem1=1028
[Code]...
And untill 6 - what after the = is the item ID. Each item has a unique ID for it (I have a list containg each item name and their ID).
Now what I want to do is: I have a listview on the left with each character in the game Image and Text. I also have a listview on the bottom with all the imgaes of each item and each text for the item.
I want to make it so when the user double clicks an item from the listview, It will automatically add it to the first picturebox (If it's empty). He can choose any item to add to one of the 6 picturebox's, When it fills one after one. When all the picturebox's are full, nothing will happen.
Now what I want is: How can I determine which "item" the user chose and according to that assign the item's picture to the picturebox, and then make a new ini file to set picturebox1's image's ID to RecItem1, picturebox2's image's ID to RecItem2 - and so on.
how do i determine if the current listview line is selected or not?
Private Sub lst_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles lst.DrawItem
If lst.Items(e.Index).selected = True Then
[Code]....
Im trying to print out all the items/sub items of a listview into one string.
here is the code i have:
For Each lvwItem In ListView1.Items
' Print the subitems of this particular ListViewItem
For Each lvwSubItem In lvwItem.SubItems
[Code]....
How do i just print out the value (MyItem1) without the "ListViewSubItem: {}" part? I know i can use a string function to remove this, but id rather not
I am trying to program the hamming code in vb... theoretically i understand and know how to do everything, first problem I've encountered is dynamic arrays in vb.net ... is it possible to determine the length of an array from the number of items entered in it, since I have no means of figuring out an exact number or length prior to several mathematical function which outcome will be the data .. directly saved to the array !!
View 4 RepliesI have the code below and when I try to populate the listview it populates all of the listview items but only the first subitem. No clue what I've got wrong.[code...]
View 2 RepliesI've got a panel - that's in a group box. All of this - with lots of other textboxes on labels - is in another panel (the big panel).I make the big panel visible and not visible based on selections made by the user.This small panel - that's in the group box. I cannot seem to make it appear.Even if I leave it VISIBLE at design time - the objects in it will not appear.Is there some kind of nesting problem that I'm not aware of!
View 9 RepliesI have five menu items that i have created as a user control and placed on the master page. Now i want one of the menu items to be visible only for particular user role and not visible for others. Here is what I did. Its not working though.
[Code]...
I'm having an odd problem when making a form visible and not visible and it not continuing to function. Here is what I have happening. I have a main form (frmMain) that is an MDIParent. On this form I have a menu to open a second form (frmCalculate) and populate a listview from Items in the database.
As I click or select items in the listview on frmCalculate the tag is read and data is pulled based on the id stored in that tag and fills in various fields on the form. This works great. However, I also have a context menu attached to the listview that allows me to perform a "what if" scenerio on the items I am calculating. When I select this menu, I hide the frmCalculate and open the frmWhatIf form where I can mess around with values on the item I had hilighted in the listview on frmCalculate. Nothing is pulled from or written back to the database here, all the information is filled in from fields on frmCalculate. It just allows me to look at rising costs and how they will affect my margins.... anyway.
If I then close frmWhatIf, it brings my frmCalculate back by setting its visible propery to true (never closed frmCalculate, just hid it). At this point if I click an item in the listview I get an exception for a null reference. IF however I never hide frmCalculate, I can open and close frmWhatIF without ever having an issue. Why do I lose the functionality to select items just by hiding and unhiding the form? As a test I added two menus to the toolbar on frmMain one called hide and one called show. I then opened frmCalculate with original menu item to populate the listview and selected a few items to test that it was working and then using the hide menu I made the form invisible and the show button to bring it back. This yielded the same exception so without even opening frmWhatIf the problem still occurs.
I'm looping all the properties in an object via reflection:
For Each p As PropertyInfo In values.[GetType]().GetProperties()
If p.CanRead Then
'Do stuff
End If
Next
how to determine whether the property in question is a generic List(Of T)? If it is I need to loop the list itself.
I've experimented with GetType and TypeOf but have not managed to get anything working.
To clarify, I want to keep this generic. I do not want to specify the type of T, I need to loop the list items and call the ToString method on each item. T could be one of a number of different types (application specific reference types). Is it possible to do this without specifying types?
(VB.NET 2005 with .Net 2.0)
Dim str As String[code]....
but i get all the data into one single first column.
