Painting With .Net 4 And Nested User Controls On Win 7 Machine?
May 22, 2012
I have form, on which a component is placed, which is inherited from Forms.UserControl. This component, called Panel, handles the layouting as visible in the screenshot below.
The screenshot shows 10 Panels. Each Panel contains its own title bar and visible area, in which any UI can be displayed.When the application starts, the application contains only one single Panel. When the user decides to split this Panel into 2 Panels, those new Panels are displayed side-by-side in the area of the old Panel either horizontally or vertically. Inbetween these Panels a splitter is added, so that the user can resize the Panels. The user can do the splitting multiple times, so that you reach a layout as given in the screenshot above with 10 Panels.
Minimizing and the maximizing the application causes a painting issue as displayed in the screenshot below. The red rectangle indicates the area, where the layout is not displayed properly.
Here some additional information:
1. Windows 7 The issue occurs only on Windows 7 machines. On Windows XP the application is running properly.
2. .Net Framework The application was developed for the .Net Framework 1.1. I upgraded it to 4.0. All warnings were fixed, which occured after the upgrade to 4.0.
3. Layouting Technically The Panel works internally with mutiple Forms.Panel, 1 Forms.Splitter etc. objects. If the Panel is not splitted, it displays the title bar and a visible area below, both instances of Panel. If splitted, the Panel replaces the title bar and visible area with 2 instances of Panel again but divided by a Splitter.
I am working on a spreadsheet-like custom control, manually painting all cells according to its bounds and indexes. All is working fine until I populate it to upto a hundred rows (with fixed 6 columns). Basically my sheet expands itself to fit all cells, so to use it properly on a form, I use a panel with autoscroll = true and with my sheet inside. The problem is, the control flickers a lot, which I think is caused by painting ALL of the cells. Is there a way to paint only the visible area.?? So when I scroll down, the control would paint only the visible cells on that area. What I am thinking right now is to not put it in a container, but rather, put a scrollbar in my control. Then that scrollbar would then handle the setting of visible cells, and then my paint event would only paint that visible cells. I am using VB btw, .NET 3.5.. I cant put the code in here cause its separated in different classes(Cell, CellCollection, Rows, Columns, Range, Worksheet, etc.)
I have a couple of controls that are set to runat="server", but are showing up as "not declared" in the vb code behind. They are not being setup in the designer.vb file at all, even if the design.vb is re-created.
The only thing that I can think might be causing this is that the controls are inside of a custom control. The code looks something like this (it has been modified because of NDA):
I have a nested custom control that I need to set focus on. I have it all internally wired up to automatically set the focus when the form loads, but when it comes up on screen, the designated accept button for the parent form is in focus instead. Even when is disassociate the accept button it still does not set correctly. How can I ensure my desired control gets focus.
I have a panel sitting in a div, and I want to use that panel as a container to add more panels! Why would I want to add a panel to a panel? Because the panel that I'm adding to the existing panel, is also made to contain objects, but only and image and label.
The existing master container panel is created during design time, and goes by the lovely name of "toolboxpanel". During run time, I have a for/next loop that dynamically creates an image, a label, adds them both to a panel, then adds that panel to the toolboxpanel,[code]...
How do you get a specific nested control of dynamically created controls (i.e. the child of a dynamic control)? The FindControl() method does not work because it only deals with TopLevel dynamic controls I believe.
I've created a function that works very well, but it's limited to AD groups direct membership. I would like to display all AD groups a user belongs to, included the nested one.
There is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
[Code]...
So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
I'm using a series of nested if/then/else statements to make sure a user enters information into each text box or chooses a radio button. What would i use to say if no text is entered in textbox1, then ... also what would i use to make a sure the user choose one or the other radio button? for example i also have a combo box, i used "If SubjectComboBox.SelectedIndex <> -1" for the if statement.
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I'm trying to develop a decent answering software that can reply to anything that the person inputed. For example this would be in a chat software, when the user receives Hello? the chat program would reply to the sender "Hi, how are you?" or what ever the person away has set up.[code]
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Where EXE is placed in one central location(Server).
I am getting bellow error on user's machine :
Request for the permission of type 'System.Data.Odbc.OdbcPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
Error after clicking on ok button:
Application attempted to perform not allowed by the security policy.Togrant this application the required permission,contact your system administrator,or use the Microsoft .NET Framework Configuration tool.
I have an idea to make user machine no need to install dotnet framework to run a .net program
first,copy all the project refrence(with mscorlib.dll)to the program directory
then,make a bat file,"dotnet error fix.bat",inside the file includes the command that copy refrences to Microsoft.NET directory will the program run like this?how do i test?
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My controls look like this: Instead of like this:
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Private Sub panFaxPhone_Resize(sender As Object, e As System.EventArgs) Handles panFaxPhone.Resize panFax.Width = (panFaxPhone.Width / 2) - 1 panPhone.Width = (panFaxPhone.Width / 2) - 1 panFax.Left = panFaxPhone.Width - panFax.Width End Sub
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i have a windows from project and in that project i created a user control lets call itcustombutton1 now i can use that control quite easily either at design time or runtime by creating a new instance of it like
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[URL]
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Private Sub picBall_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles picBall.Click tmrOne.Enabled = True tmrTwo.Enabled = True
code For Each item As Reflection.FieldInfo In GetType(NameSpace.ClassWithNestedClasses).GetFields rtfAppend(item.Name & ":" & Tab & item.GetValue(Me)) Next For Each item As Reflection.PropertyInfo In GetType(NameSpace.ClassWithNestedClasses).GetProperties()
[code]...
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