Drawing Artifacts - ComboBox Contents Scrolled Up Or Down
Dec 30, 2010
A simple form with a combobox called Combo, drawing artifacts when using ComboBox with Custom Draw and the contents of the combobox is scrolled up or down, and with this source code, illustrates the issue:
Public Class Form1
Private Sub Combo_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Combo.DrawItem
Dim Combo As ComboBox = TryCast(sender, ComboBox)
If Combo Is Nothing Then Exit Sub
If e.Index = -1 Or e.Index >= Combo.Items.Count Then
e.DrawBackground()
[Code] .....
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Jun 22, 2010
Brand new to VB 2008 Express, but have done some work in VB 6. Not sure what I'm missing, but here goes. I have two comboboxes linked to an Access 2007 database. One box lists the names of the States in the US.
This is what I used for the Table Adapter Configuration Wizard for the combobox "State" SELECT ST_UID, ST_NAME FROM STATE
For the combobox County I used: SELECT ST_UID, CTY_NAME FROM COUNTY ST_UID is an Integer.
I created a label with a bound value to STATE.ST_UID so that when a user selects the name of a state from the State box the appropriate ST_UID populates the label, (i.e, California has an ST_UID = 5).
The problem is when a state is selected, I only want the Counties for that state to appear in the County box, i.e, COUNTY.ST_UID = 5 if California is the selected state.
I then tried to convert the value in the st_uid label to an integer:
CODE:
This is what I last tried when again using the Table Adapter Configuration Wizard for the table that populates the County box: SELECT ST_UID, CNTY_NAME FROM COUNTY Where ST_UID = 'StUID' Order By st_uid, cnty_name
What I'm getting is a "Data type mismatch in criteria expression." I'm sure my error is something so simple.
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Apr 25, 2011
I have a simple VB calculator app with a PrintForm procedure shown below which works fine on my Win7 machine but when I deploy the app to an XP Pro machine it produces artifacts from the MenuStrip where the Print command is executed. Any ideas why this would happen or how I can resolve it? I'm new to VB.net and OOP as a whole so if this is a simple problem.
[Code]...
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Jul 25, 2009
I'm trying to make a custom combobox from scratch that multiple instances will share the listbox that holds the data on. I'm trying to draw the button face manually using GraphicsPaths and pens and brushes, but I'm having a few issues with it:
1. How do you draw that down arrow glyph in a way that doesn't look like a two-year-old sneezed on it? I'm having problems with the shape looking like the traditional one.
2. How do you position the listbox that contains the data in such a way that isn't bound by the containing form's render window?
3. I've tried to make the background look different when it has focus, but the OnPaint seems to think it always has focus and always makes the background the "focused control" background.
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Dec 3, 2009
My issue is i have some non standard XML and i need to tidy it before it can be parsed with an XElement.Parse(text) function the problem is that the source is as follows (just a sample, the entire file contains many items)
[Code]...
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May 29, 2009
I want to change the colour of the autocomplete section of a combo box depending on the value of the item. I found the following code to do this for the main drop down section like so.;
Private Sub cbdept_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles cbdept.DrawItem
Dim c As System.Drawing.Color
[code].....
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May 15, 2009
I have an Excel 2007 workbook chock full o' VBA macros that do various things, including one that jumps from chart to chart making PDFs of each using PDFCreator, based on some code I borrowed from Ken Puls (url...).However recently I and some users of the workbook started having problems where the PDFs would be created with either gray image artifacts over the charts,or the whole chart image would have a double of itself skewed slightly. It just happens the problems started after we did a global upgrade to Office 2007, though I had had 2007 installed on my computer for a while and tested and used the workbook extensively without issue up until then. Here is the part of the code that automates the printing:
Sub PDF_print_all()
'Author : Ken Puls (www.excelguru.ca)
'Macro Purpose: Print to PDF file using PDFCreator[code]...
The problem is not consistent either... sometimes it will print to PDF with an oddly shaped block of gray, and sometimes it will only have the whole chart image doubled. The only consistency I could find is that sometimes if an object is selected in a chart beforehand (a text box, chart line, axis numbers, etc) the gray artifact will partly mimic the shape of whatever object had been selected.I wish I could include example images to show exactly what's happening.I know it's not a problem inherent to PDFCreator because if I manually print to it in Excel, the PDF image looks perfect. It's only when I use the automated method that the problem occurs, so I thought maybe it was the code.
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May 2, 2011
I created a contact list application that loads a .txt file into a combobox. I need to then sort what's in the combobox, but I can't.
Imports System.ComponentModel
Imports System.IO
Public Class Form1
Private DG_contactsBlist As BindingList(Of String)
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim DG_contacts As New List(Of String)
[Code] .....
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Feb 23, 2011
I am using vb.net and mysql as the database. I have created a field containing the abbreviations of words. My vb.net form provides a combobox which I want to connect to the field abbreviation. I want to configure the combobox so that when clicked, all the acronyms that exist in the database appear in the combobox.
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May 9, 2012
I have a pretty weird one here, would it be possible to read a column of a text file in to a combobox and to display the directory after the contents of the combobox?[code]...
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Aug 19, 2011
getting a scrapped list from a website into a listbox. I now need to use the contents of that listbox in a combobox and am going nuts. I have included the code
[Code]...
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May 16, 2011
Can someone tell me why this code works exactley the opposite of the way I thought it should?
[code]...
I have a combobox (cbKeyWords). I want to make sure tbAddEdit.Text does not already exist before I save. To me I should be testing for a False result not True. But the above code, goes to the msgbox if findstringexact=false and saves the data if it's true.
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Aug 7, 2009
why this code works exactley the opposite of the way I thought it should?
[Code]...
I have a combobox (cbKeyWords). I want to make sure tbAddEdit.Text does not already exist before I save. To me I should be testing for a False result not True. But the above code, goes to the msgbox if findstringexact=false and saves the data if it's true. Am I crazy or am I missing something? Shouldn't FindStringExact return false if it's not found?
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Feb 22, 2012
I have a form with a combo box and a checked list box. When I select one item in the combo box, I want the list in the checked list box to change to the appropriate choices.
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Feb 5, 2010
I have a combo box that's filled from a query in the database. If I add a field to the database, the new field won't show up in the form until I close it and reopen it.
So, how do I refresh the contents of that combo box?
I bound the data onto the combo box like this:
[Code]...
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Dec 16, 2009
I am currently pulling data from a database into a comboBox. My intent is to have the description of the selected option in the comboBox displayed in a listbox. How to i get this data to be displayed in a listbox?
Here is the code that I have so far:-
Imports
System.Data.SqlClient
Imports
[code]....
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Feb 23, 2012
I am new to the forum and to VB, and not great at coding in general.I am learning, and this site as well as others have helped me get farther than I ever imagined. Second, my project is purely for my benefit, so I can learn.There is no corporate or school related goal here, just trying to learn.So the title is a summary of what I want to do. I have a form with a combo box that has five different choices, and below it, a checked list box. What I want is the collection inside the checked list box to change depending on what I select in the combo box above it.For instance, I have room 1 - 5 in the combo box, and the the checked list box below it, I have the furniture associated with that room.The eventual goal is to have this form populate a database, that allows the checked furniture to be recorded in a record.
I assume I need to use a db, such as access, to list the "furniture" in each room, and have a different table for each room, where the combo box selection will populate the checkedlistbox from the appropriate tables contents.I need a step by step on this, because I am a bit of a brick. Most tutorials are also done in VB 6 or VB 2008, and there have been steps missing in association to VB 2010.
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Mar 18, 2010
With that program, it has extra dialogs within it. They cannot be scrolled out and stay topmost while the whole app is focused. How can I do that?
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Jul 2, 2010
During my program I put lines out to a text box on the screen as a form of logs.After each line is added I do a ScrollToCaret() to move to the end of the lines.However, if I'm manually scrolling around the logs/lines (eg: using the scroll bar) I don't want to that.
Is there something I can check so as not it issue the ScrollToCaret() if the user if currently scrolling around in the text box?
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Sep 2, 2009
i have a panel on a form and i have various controls inside the panel which i then shrink and enable the panels scrollbar so i can scroll through the controls. i am trying to get the exact size of the panel (unshrunk).for example the panel is 500 pixels in width and i then shrink the panel down to 300 pixels and enable the scrollbar. when i try to get the size of the panel using code like
panel1.size.width.tostring
it keeps telling me the panel is 300 pixels long ..which yes it is because i shrunk it down but i want to get the full size of the panel which should be 500.
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Jan 29, 2011
I set up an Openfiledialog and put in an initial filename value (the last filename the user opened).However, when the dialog shows up, it is as if the filename has been scrolled off to the left.I only see about the last 10 characters of the name, even though the filename field is big enough to show the whole name.It is also selected, which is ok - it means if the user types a name the value will replace what I've put there, which is reasonable behavior.How do I control this 'scrolling'?I call it scrolling even though there is no scroll bar.If I click in the field and use the left arrow key I can back up to the beginning of the filename - the filename gradually shifts into view about 10 characters at a time, until I reach its beginning, at which time I see the entire filename in the filename field which is how I'd like to have things when the opendialog opens.
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Aug 22, 2010
I am modifying some code I found here to test to see if a user has scrolled to the end of the control. In this case the control is a Crystal Viewer but I posted here because I think the issue is based on the vertical scrollbar not the Crystal Viewer itself.
The code flags an error at
Me.CRViewer.Controls.OfType
Indicating 'OfType' is not a member of 'System.Windows.Forms.Control.ControlCollection'.
I understand the concept that I can't reference something that it is not but I don't know how to fix it. The original code was for a DataGridView.
The ultimate goal (not finished) is to find out when the user has used the mouse or possibly the scroll bar itself and if it hits the bottom of the page of the viewer, then trigger a new page so it looks like they can just keep using the mouse to scroll.
Public Sub New()
Me.InitializeComponent()
Dim vscroll As VScrollBar = Me.CRViewer.Controls.OfType(Of VScrollBar)
[Code]...
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Jun 30, 2010
I am writing a GUI application to run on a touchscreen device using VB.NET and WPF--it must be full screen at all times, like a kiosk app; the window must not be able to resize or move in any way. The window contains a ListBox that users can currently scroll through by dragging across the list. The problem I'm seeing is that when the user drags across the list, the whole window moves a bit, exposing the desktop underneath, then springs back into place once the user stops dragging. I have not been able to figure out how to keep the window stationary while still allowing users to drag across the ListBox to view all list items. Here is a somewhat simplified version of my code:
[Code]...
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Jun 3, 2012
draw individual pixels, without resorting to drawing a line and setting it's length to 1. Is there an actual ability to draw a pixel that is just 1 pixel big?
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Feb 18, 2012
I need some code to draw a resizable, draggable rectangular cursor (or selection box) on a picturebox. I found some excellent code (albeit rather old) that does just that, but on a form rather than a picturebox. I have tried converting the code - basically moving things to the picturebox events (Paint, MouseDown, MouseMove etc). It nearly works but leaves a trail behind it when you move or resize the cursor. In other words, the selection rectangle is not being erased before being drawn in the new position.
Is there some fundamental difference between drawing graphics on a form and drawing on a picturebox that would cause this behaviour? Something like, when you invalidate a form and cause a redraw it erases what you did last? If not, then I just need to dig a bit further and work out how the cursor is being erased from the previous position.
Here's the original code that works fine on a form:
Private DragRect As New RectangleF(20, 20, 100, 80)
Private Adornments(7) As RectangleF
Private MouseInRect As Boolean = False
[Code]....
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Nov 11, 2010
i have an array of booleans whose current boolean values I want to preserve but add additional length to the array? How can I achieve that? My code looks like this:
Dim Array() As Boolean
Dim ArrayInterimShort() As Boolean
ReDim Array(119)
[code]....
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Jun 21, 2010
Say I have 3 Buttons, labelled: Unit 1, Unit 2 and Unit 3. When I click on any button I want a drawing of that unit to appear on screen at a pre-specified starting point. Thereafter when I press any other one of the buttons the unit drawings appear alongside each other in a line. So I could end up with:
[Code]...
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Aug 17, 2009
With this line...
If PictureBox1.Image = My.Resources._2star Then
I get this error: Operator '=' is not defined for types 'System.Drawing.Image' and 'System.Drawing.Bitmap'.Is there another way to say = with images?
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May 23, 2009
Is it possible to convert an object form System.Drawing.Graphics to System.Drawing.Image?
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Jan 21, 2010
Here is my favicon code
Dim oURL As Uri = New Uri(e.Uri.AbsoluteUri)
Dim favicon As Image
If oURL.HostNameType = UriHostNameType.Dns Then
[code]....
The error is Value of type System.Drawing.Image cannot be converted to System.Drawing.Icon Is it even possible to make the favicon be the icon of the form?
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