Vertical Scrollbar Getting Smaller, But No Data Is Shown In The Listbox?
Jan 9, 2009
I have been working on a much larger project and came to a point where I decided threading should be used.It seems in previous version of .Net, a background worker was able to update controls that were were not created on that thread. Now, it doesn't seem to be the case.I basically just began a new small project to try and teach myself the basics.Form1 Consists of A listbox, A progress bar, a label and two buttons, one to start and one to cancel.
imports system.threading
private sub btngo(byval sender as system.object, byval e as system.eventargs) handles btngo.click
pbprogress.minimum = 0[code=....
This code appears to be updating the listbox.I can see the vertical scrollbar getting smaller, but no data is shown in the listbox. The progressbar is also updating properly while that is working, indicating proper background operation.But what it's not doing is this:
1. Label is not updating percentage
2. The form is not free to be used by the user (me)
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Jan 10, 2011
I have a listbox which content is based on a treeview. When the user doubleclicks an item in the listbox the treeview will be updated and aftervards all the items in the listbox will be removed and the text of each TreeNode in the TreeView will be addedto the ListBox
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Oct 21, 2010
So with the stock Textbox, I set the Scrollbars property to Vertical. This is great if the text in my box never changes; I can scroll up and down while the box sits still. If I'm running a background operation that logs output to the box though, the scrollbar resets itself to the top every time I append text to the box.
I know I can set the Textbox.Selection property (or use the Select method) to reposition the carat in the textbox, make note of that position in a variable, then append text, reset the carat, and use the ScrollToCarat method to reposition the scrollbar where it belongs. That's a really (ridiculously) long way around. Anybody know if there's another/better way of holding the scrollbar position, short of actually building a custom control (or using a Textbox and a separate Scrollbar)? It never hurts to try. In a worst case scenario, you'll learn from it.
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Apr 25, 2010
My problem is that I built this program for my VB class, but I built it on my desktop at home which is a 23" monitor. When this is opened on a smaller screen, you dont get to see all of the project. I want to add a vertical scroll bar but that is beyond what I have been taught and beyond what my book teaches...
how to get a vertical scroll bar to scroll the whole form?
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May 25, 2009
I have a TOS agreement that i would like my user to have to view ...
basically the same way "World Of Warcraft" does it ...
You must scroll to the bottom for the accept button to be enabled and clickable...
but in vb.net i cant seem to find a way to determine the vertical scrollbar postition .
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Aug 27, 2004
The scroll bars actually move now, They just move the wrong thing. When I click the Horizontal bar it moves the picture box to the left part of the screen and I can scroll the box back and forth. If I click the Vertical Bar it goes up to the top and I can move it up and down. So if I click both of them, the picture box goes to (0,0) of the form. It wont move the image inside. I can't figure out how to assign the scrollbars to the image instead of the picturebox.
Try making a form with a Picturebox, Vertical Scrollbar and Horizontal Scrollbar in it and rename all your stuff the way I got mine:
Horizontal Scrollbar = hsbPicMap
Vertical Scrollbar = vsbPicMap
Picturebox = picMap
Set the image property in the properties box to whatever you want. Try to make the picturebox of fairly big size. Mine is set to 656, 528 in pixels, and the location is 152, 72 on the form. The image I am using is about 1500, 1200. The bars are on the right side and the bottom of the picturebox.
Code:
Public Class frmMap
Inherits System.Windows.Forms.Form
Private Sub HSBpicMap_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles hsbPicMap.Scroll
picMap.Left = -hsbPicMap.Value
[Code] .....
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Apr 7, 2012
I have a TextBox control with a lot of text which has a vertical scrollbar, and every time I hide/show the control the position of the scrollbar stays the same. I'm trying to figure out how to change the position of the scrollbar to the top of the textbox, as if it were at the beginning of the text.
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Sep 1, 2009
I faced a problem that the vertical scrollbar of datagridview will be un-functional.Here are the steps to rebuild the problem:
1. Add a new datagridview component.
2. Add a new timer to set the datasource of datagridview at a regular time. For example, I add following code on the Timer1.Tick event:
Dim v_connDB As New Odbc.OdbcConnection
Dim v_daCA2 As New Odbc.OdbcDataAdapter
Dim v_dsCA2 As New Data.DataSet
[code]....
3. Then I press the down arraw key on the vertical scrollbar with mouse while the datagridview re-bind its datasource, the vertical scrollbar will be un-functional. And the action will be changed to be re-size the datagridview will I press the vertical scrollbar position.So, is it the bug of datagridview? How can I fix it?
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Mar 24, 2011
I have windows application in which I have web browser control. I want to display vertical scrollbar, somehow its not getting displayed. Is there any way of enabling the scrollbar or any property which need to be set. I have already set the ScrollEnabled
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Oct 24, 2009
I would like to know how i can make only visible the vertical scrollbar of my webbrowser
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Feb 9, 2010
I want to know if there is any way to find out what distance vertical scrollbar on rtb has moved(in twips or inches)?
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Jul 10, 2011
is it possible to change the width of the vertical scrollbar in a listview .When the scrollbar width is bigger, its easier to operate by hand on a touch screen.
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Jan 14, 2010
I'm having a problem assigning the arrow keys to the right scrolling events.I have a VScrollbar and an HScrollbar. I want the left / right arrow keys to scroll the horizontal bar, and the up / down arrow keys to scroll the vertical bar. The default behaviour seems to be that the first created of the two (VScrollBar or HScrollbar, depending on order of creation) received all arrow key events as a Scroll event. So when I push up / down / left / right, it is my VScrollbar that moves (HScrollbar might move also with the left / right arrow keys, I don't remember). I tried catching the KeyDown event on my form, to manage the left / right / up / down keys myself, but apparently the Scroll events are triggered first...In any case, what would be the "right" way to use a vertical and horizontal scrollbar and have the arrow keys do what they're supposed to do in VB. NET?
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Feb 15, 2009
When a panel's AutoScroll is set True then it will add scrollbars for navigation of the entire size of its content. What I want is to be able to set the vertical scrollbar to go to top or zero so its contents top controls will be viewable.
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Nov 13, 2010
I have the following code to resize the datagridview but the vertical and horizontal scroll bar are not shown when there are colunns and rows exceed the width and height of datagridview objects.Bascially the following code is similar to dock to the botton, the only difference is docking to the botton change the Y position of datagridview and fill the botton section whereas my code fix the Y position of datagirdview and fill the bottom.[code]I have tried with the dg.ScrollBars = ScrollBars.Both but it it is not working as well..May i know how to get both scroll bars working.
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Jun 9, 2011
I have a load of information on my label in a groupbox on the form there is too much information to be seen in one go so i want to use a vertical scrollbar to move the label up and down inside the groupbox so it can be read.
The issue i'm having is:
1: The label covers the bottom edge of the groupbox (looks a little naff) i need it to fall inside the groupbox if possible.
2: Any movement on the vertical scrollbar seems to send the label in one direction only - so how do i work it so that up moves it up and down moves it down?
Should i use a multiline textbox rather than a label and move the carat?
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Apr 6, 2011
I need to set the background color of a label based on the value of a vertical scrollbar. i.e, if the user click the vScrollBar the background color of label must change like from 0 to 255.if it reaches to 255 again initialise to 0. I tried color.FromARGB function but it is not working.
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May 21, 2011
How do you set the maximum range for the horizontal and vertical scrollbar in a panel
in VB.NET 2008 ?
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Jan 10, 2010
I set the Scrollbars property of textbox to ScrollBars = Both but the textbox shows only the vertical scrollbar. (i already set the Multiline = True)
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Mar 9, 2009
I have a datagridview in my for that contain some infos like name of a file, date and hour but the vertical scrollbar doesn't work, the scroll doesn't move. Here's my code
If Me.ofd_Fichier.ShowDialog() = DialogResult.OK Then
Dim str_Fichier As String
For Each str_Fichier In ofd_Fichier.FileNames
[code].....
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Sep 30, 2010
I'm working on a VB.NET application using VS2010 for an application that will run on a touch-screen. I have a problem with a mutli-line text boxes, ListBoxes and DataGridView controls which contains a vertical scroll bar. The scroll bar is too small for anyone with big fingers. Is there any way to make that scroll bar wider so that it's more "finger friendly"?
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Jan 6, 2011
The scrollbar that comes with the ListBox is too small for touch screens, so I use my own scrollbar instead. But when you do this on various forms you end up repeating a lot of code. So my solution was to create a custom scollbar that has a property I can set to the control I want it to be a scrollbar for. In vb6, I can use the withevents keyword to get access to the control's events so that all the scrollbar related code can be in the custom scrollbar object I created, except...I had to create a refresh method for the consuming code to use to let the scrollbar know when the number of items changes. The scrollbar doesn't need to be told how many items there are because it has access to the control, but for a listbox there is no event to tie into when an item is added/removed so not 100% of the scrollbar related code could be encapsulated.
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Aug 18, 2010
"For tax purposes an item may be depreciated over a period of several years. Write a program that request a description of an item, year purchased, cost of the item, the number of years to be depreciated (estimated life) and the method of depreciation (combo box), compute and display a depreciation schedule for the item similar to the schedule below. NOTE: FOR NEXT for Straight line method, DO WHILE LOOP for sum of years, DO LOOP UNTIL display table of depreciation."i don't know it this is correct 'cos when i run it, it doesn't show anything. when i clicked compute
Public Class prjactivity6
Dim intyearp%, intlife%, intmethod%, intstraightyear%
Dim dblcost#, dblstraight#
[code].....
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Jul 9, 2010
How about a Nibble etc.
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May 8, 2009
Im trying to fill a ListBox with more than 65542 items in a Visual Basic .NET 2008 project. The ListBox seems capable to collect 100000 articles, but when i scroll through the list the scrollbar works till the 65500th listing (more or less) then it just jumps upwards.The weird thing is that I have two version of the same project which have different behaviors. One (tmp.zip) scroll fine with the scrollbar, but it doesn't with wheel mouse button.The other (listBox.zip), the scrollbar goes mad but mouse wheel seems ok
listobox.zip: is a new project created within VS 2008 tmp.zip: is a cleaned up form imported in VS 2008 from an early version (VS 2003?)
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May 16, 2012
Very simply, I'm positioning a small ListBox over a DataGridView column when the user right-clicks and selects "Show Distinct Values". This works fine until the vertical scrollbar of the DataGridView is clicked. Once that's done the listbox pops up all the way over to the left edge of the DataGridView. As confirmation of the problem I created a small app to test with.
[Code]...
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May 17, 2009
I've been having a problem setting certain items in a listbox as checked when the form is loaded. I have tried putting the code in the form_activate, form_load, and form_shown events and each still crashes when it encounters:
[Code]....
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May 11, 2011
I'm really hoping I can describe this question in an understandable way. This is a puzzle that I have not been able to begin to solve even though I (mostly) understand it. I'm just not sure where to start, and I'm really hoping someone out there can get me headed in the right direction.
I have a LARGE table of data. It describes relationships between objects. Let's say the Y-axis has items numbered 1-1000, and the X-axis has items 1-1000 also. If item #234 on the Y-axis is related to item #791 on X, there will be a mark in the table where the row and column cross. In some industries this is referred to an a Truth Table. One can, at a glance, see how many items in a system relate to each other. The marks in the table can help to identify trends and patterns.Here's some other helpful stuff about the nature of the table:
The full range of the number of relationships (r) for each item on either axis can be 1 <= r <= axisTotal.The X and Y axis will share common items, but each axis will also have items that the other axis does not.Each item will only exist once per axis. It can be on X and Y, but it would only be on each one 1 time.The total number of items on each axis will most likely NOT be equal. Each axis could have from 50 to 1000's of items.
The end result is that this is going to be a report that needs to be printed. We have successfully printed a table that had about 100-150 items on each axis on an 11in X 17in piece of paper. Any more than that and it begins to be so small it's unreadable.
What I am trying to do is split the super large tables into smaller tables, but related points need to stay together. If I grab item 1-100 on X then I would need each item they relate to from Y.I've generated a number of these tables and, while the number of relationships CAN be arbitrary, I have never seen an item relate to all other items. So in real practice the range is more like 1 <= r <= (10% * axisTotal). If an item's relationships exceed this range, it can be split up into multiple tables, but that is not optimal at all.
At the end of the day I think we, and our clients, would be happy if a 1000x1000 item table was split into 8 to 10 printed pages of smaller, related tables.One other thing worth noting, there will be no empty rows or columns in the table. Every item on both the x and y axis will relate to at least 1 item on the opposite axis.
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Aug 29, 2010
With no answers from Google and not finding the answers by searching, just curious as you were to go about simply giving a ListBox a horizontal scroller once it passes its visible border the same as the vertical does?
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Apr 7, 2011
I have a listbox on my form which gets items added as the program progresses, when there are more items than the box can display, the vertical scrollbar appears, fine... so far so good.I would like the scrollbar default position to be at the bottom of it's column so that the last entered item is displayed but can't find the relevant command, I assume there is such a command.
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