I'm trying to build a custom ListBox control as inspired by the 'Audi Infotainment System' on high-end Audi vehicles. The only difference is i would like to have a 'boundary' where when scrolling up/down moves the actual list up or down. Basically, i would like my list to act like a normal ListBox except i would like to show say one or two items above and below normally only visible items.
View 3 RepliesI don't usually use VB but now I must for an assignment. I would like to know if it's possible to change the display name for an object on a listbox. For instance, if I add to it a user defined class, there's a way to provide it's display name, instead of converting it to string and then add it.
This is what I have
Dim format As String = FormatOutput(object)
Lista.Items.Add(format)
I would like to have the same output, but instead add the object.
Note: if such is not possible, then how can I associate the list box selection to the actual object? Doing it by index is painfull, because I'm using linked lists (ie., instead of arrays).
Note 2: python has a __str__ method which is called by default when the object is cast to string. Is there anything like it in VB?
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.
View 2 RepliesI'm having some problems with custom controls and anchors today. I made a custom control containing a picture box and a vertical scroll bar. When I adjust the form the custom control outer area (the blank part) will adjust to the size of the form but the picture box and scroll bar do not. I have the picture box anchored to all sides and the vertical scroll bar anchored to the right side. They just will not adjust with the control when it is resized on the form.
View 4 RepliesI'm trying to bring up a simple right-click menu on a listbox and I'm having little luck with it. I created a basic ContextMenuStrip named "ContextMenuStrip1" and I'm trying to call it in the ListBox's Mouse Click method:
Code:
Private Sub ListBox1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles ListBox1.MouseClick
If (e.Button = Windows.Forms.MouseButtons.Right) Then
ContextMenuStrip1.Show(MousePosition)
End If
End Sub
So here's what it's actually doing. The right mouse button doesn't seem to activate MouseClick at all for this object. It is caught in MouseDown, but when I try to call this from that method, the ListBox Index doesn't change. How can I get a right-click to be called from the MouseClick (Not imperative) and how do I get the ListBox to change the index with a right-click?Also, the menu looks like one of Office's right-click menu that can have an image to the left of the text. When I don't have an image the text is about 50 pxls or so away from the left edge. This looks weird. Can I change that?
Is there a way to make custom scollbars in listview? And could someone please show me how, step by step. I'm completely new at this
View 2 Repliesi want to make a class for a custom button for which the user of the class can choose his own images for Normal, mouse over and mouse down state.
View 5 RepliesI created an application in VS2005 that draws text with a custom font and color. The images look great from my XP machine. But from another machine running Windows Vista, the graphics are messed up. It seems that the transparencies inherit the default black background so there's this gray'ish/black haze around the text...
View 1 RepliesOn my form is a listbox. When the user clicks insert (in the menu) then I add a blank item in the listbox. The user then enters the data and then I want to update my listbox with the value(s) the user entered. The problem is that I don't see the update in the listbox, unless I reload it from the database. [Code]
View 1 Repliesi wanted use some api graphic functions. but how can i use the hdc argumenter, if the picturebox don't have it?
View 11 RepliesHow to implement resize begin and end on controls the way a Form does. I had the idea that this can be accomplished using windows messages API (WM_ENTERSIZEMOVE and WM_EXITSIZEMOVE) but most of the samples I've seen so far are for windows. The reason for this is because I have a control that needs to re-render an image. The controll is inside a split container. The split container has only the Resize event. Is there any way this can be done?
View 4 RepliesI downloaded the custom made OvalShape control for Visual Studio 2005, and I really like it. One problem I have, is that I would like to have a label docked inside the Oval, as if it was a Panel or a GroupBox or pretty much any other control. With the other controls it does this automatically when I move the control inside them, but when I move the label inside the Oval, it won't "stick" to it. The OvalShape will move around and change size quite a lot in my app, so it would be nice ot to have to add a snippet of code after every movement of the OvalShape.
View 2 Repliesi have 3rd party custom tab control , that does not have RTL support also no source code so i sub classed it and mirrored it like below
[Code]...
If a tab is highlighted and you hit the left/right arrow key, it goes to the previous/next tab. I want to remove this functionality. I only want the user to be able to change tabs with the mouse click.
View 5 RepliesI've got an app that I want to have an MDI with. It functions fine, but there needs to be a control panel off to the side of it to drive the child documents' creation. I have two problems with this.
First, if I add the control panel to the side of the form, it just overlays the MDI portion of the form and the children will spawn behind it. I can more or less manage the positions of these children, but the problem comes when I want to minimize the children, they minimize behind the control panel and I don't know how to move them. So I need to shrink the area they can move around in. I've read in places that you can use the splitter object, but that never seems to cooperate with me and only wants to move to the extreme left or right of the parent form. How can I reduce the area the children get to interact with? I've tried creating a MDI Panel, but VS has a fit with that.
Second, I've got a datagridview holding the data that will spawn the child forms. This is working well, but even though I've set the rows to be not resizeable, I can still make them grow or shrink during run-time (not programmatically). How do I stop this?
I have a visual basic .NET application that starts up a command prompt window using the following method:[code]The bat file then goes on to start up an application, which has a lot of output to the command prompt.I was wondering if there was any way to pipe the output of the bat file to a visual basic control. I am trying not to modify the bat file, if I can help it.
View 9 RepliesI am re-writing my old VB6 DXF viewer control in VB.NET Winforms. Attached is a picture of my testbed app. As we only need it to check parts that have been created to generate gcode for our laser it is limited to Points, Lines, Arcs, And Circles. It has Point, EndPoint, Centers, and Intersections snaps for all entities and combinations of entities. Measured output is displayed as Actual Point to Point plus Horizontal and vertical delta. Zoom Extents, Zoom Window, Pan and Mouse Wheel Zoom are fully functional. The last took a while to develop as I wanted the Zoom to be centered about the cursor position just as it is in Acad.
View 19 RepliesI'm wondering if anyone has been getting a 'System Exception Violation: Attempting to write to protected memory' exception.I have 3 calendar controls on a form and when selecting dates on the 3rd one, I am getting this error when I select a 2nd date.
View 6 RepliesI'm new to VB, now working with VB 2008 Express Edition. Was once very proficient with "procedural" languages of the 70's (eg. Fortran, COBOL, etc), but totally new to OOP and the "Visual" languages. Despite being a quick study, eloping a user interface to a USB-connected infrared remote control device. The UI's graphical element (a "virtual remote") will be a PHOTO of the IR remote control device supplied by my target-equipment's mfr, OVERLAYED with functional software control buttons in their respective positions. "Pressing" a button on the virtual remote will cause the USB device to emit the desired IR code sequence.
View 2 RepliesI recently wrote an inherited picturebox control. From within the control inside methodI I call Me.Invalidate to fire the control onpaint event. But onPaint does not fire.
View 2 RepliesIs it possible to get the MouseWheel event from an Interoped ActiveX Control?
I have a DXF Viewer (with measure) control I wrote in VB6 that is quite frankly... Huge. It would take an inordinate amount of time to rewrite the whole thing and supporting tools in VB.NET. The MouseWheel event is used to Zoom in and Out. The control has a MouseWheel_Input() method to accept MouseWheel data from the host.
I added all the VB6 Mouse events, the Enabled Property, and The ActiveControl Property in VB6. Recompiled and registered the control on my VB.NET development machine. Added the control to my new VB.NET project and verified it has a focus method.
I'm using the MS Charting control, and can't find the way to create the translucent effect shown in their example piccy[url]...
Notice how the pie chart is translucent. How is this done with the chart control on a winform?
I am attempting to write a simple 11ball style game. It requires images of poolballs overlapping each other. Since the balls will need some internal intelligence I was hoping to create them as usercontrols.I am having trouble gettiing the control's background to be transparent.Setting the background color to (Web) transparent only makes the background clone the form background color.
View 1 RepliesI have a list of about 150 students that I would like to organize. I need the user to be able to select individual students, and I was hoping to use a treeview control to separate them into Sophomore, Junior, Senior(No freshmen) so that way it is easier to locate a single member.
My problem with this plan is that checkboxes are beside both the root and the child nodes and I only want the user to be able to select the individual students. So my question is is there a way to only put checkboxes beside the students or is there another control that can achieve the same effect?
Using VB 2008. We have an app with a third party grid on it works well enough. This is a small utility within a bigger suite, and adding/updating it involves a simple EXE copy. The issue I am trying to address is that not all customers will have the 3rd party controls on their systems, and we want to avoid deploying them if we can.
Can I build the app so that if the controls are present, the app uses them. But if they are not present, I use a simpler control? I picture using a 'launcher' form that tries to load Form2 with 3rd party. if it errors, then just load Form3 with common controls. But can I even get to that point? With missing controls, will the app even load? I understand Late Binding for objects, but this is a control right on the form. Can I late bind a control and add it to form dynamically perhaps?
[code]For some reason I cannot change the color properties for the MonthCalendar control.[code]No matter what I change it to, it stays to its default color of white and black. Actually none of the color options work on any of the sections of the control.I am trying to hide the white border around the control and but a blue bar under the name of the month (top section).I have tried deleting the control and creating it anew on the form but no luck.It was working a couple of weeks ago.
View 1 RepliesI frequently use TextBoxes that expect date values. I do a tedious job every time to handle the Validating event. The Validation event ensures that the value is a valid date value according to the current thread's Calendar, and if so, formats the date to "dd-MM-yyyy".
I want a TextBox (e.g. DateTextBox) that automatically runs validation and formats its Text property. All I have to do is dropping it to the form.
I know I should use inheritance; but I do not know where to put the auto-validation code; and I do not know how to save the inherited class as a control in the ToolBox.
I am developing an app that has a treeview on the left in panel1 of a split container. When you click in a node it loads a user control into a tabcontrol that is in panel2. Some of the user contols contain webbrowsers that autorefresh every 15 sec (not under my control). I can successfully remove a tab by a contextmenu but I can still hear the clicking sound of the webbrowsers refreshing. Not sure what to do to completely remove the usercontrol. Treeview control code for one node: there rest are basically the same
Code:
Dim tabcount As Integer
tabcount = TabControlMain.TabCount
[CODE]...
Code to remove a tab and all tabs:
Code:
Private Sub RemoveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RemoveToolStripMenuItem.Click
TabControlMain.Controls.Remove(TabControlMain.SelectedTab)
[CODE]...
I also originally had this setup to work without the tabcontrol and just load the usercontrol into panel2 of the split container. Each time a new node was selected from the treeview I would have SplitContainer1.Panel2.Controls.Clear() to remove the current usercontrol. I would still hear the clicking of the old usercontrol.
I'm making a custom class that mocks the System.Drawing.Rectangle class because the Rectangle class doesn't have a name property. I need a name property because I am adding all of my rectangles to a collection and I need a little more info stored than just their locale and size. So I changed the _onPaint event but nothing is working out when I run the program?
Public Class Rectanglar : Inherits UserControl
Public BackgroundColor As Color = Color.Blue
Public Sub New(ByVal name As String, ByVal XY As Point, ByVal Widthy As Integer, ByVal Heighty As Integer)
[code].....
I believe that this is in the correct forum due to it being about creating an interface item, but if I am wrong then let me know and I'll try and bring this thread to the attention of the mods to be moved to a more appropriate forum. I am currently trying to create a generic navigation control with a similar style to the outlook navigation bar. I have figured out how I would be able to dynamically create the bottom part where you select the menu option, but I'm struggling to figure out how I would be able to create the top part, which can contain any user control that the developer would want.
So basically what I'm trying to figure out is, is there a way to allow for a developer to add controls to a specific area of your user control?If there is a way of achieving that then if anyone knows how to do this;In ASP.Net you have the login controls and with one of them, you are able to have different views depending on whether the user who is viewing the web page is logged in or not. Is there a way of achieving this in VB.Net for a user control that could be set up so that I could have the developer able to switch the view in the designer to show them the view for when a specific navigation option has been selected.
The one thing that I have thought of that could possibly cause a problem is having the capability of knowing when one of the user controls has been clicked, while I haven't figured this out exactly, I believe I should be able to achieve this by having an event for the navigation user control that provides the developer a reference to the control.
While I would hope that I have explained what I'm thinking well, its before my first coffee of the morning so I might have missed out some detail which would help someone to help me if I have then please let me know and I'll provide any details required.Also if what I'm envisioning is Pie in the sky, then let me know and I'll just have to make a base which I would just have to make a more bespoke system.