Let say that I'm creating thousands of custom controls, each control has own data assigned to it (like name, id, etc.), now I would like to add
click event for each of these custom controls
access from software any of these dynamically created controls
So I would like to show MsgBox if user click control #452, which will be returning values assigned to object in custom control class (passed during creation of new control on user form)
Second thing is that I would like to access at any time any of these objects and read values assigned to object in control....
How to do it ? Each control has name assigned like "Example1", "Example2", "Example3" but I don't know how to access it from code as any of these exists during writing...
Also I were trying to find how to create and rise events but it seems that all solutions are for statically created controls and I need to rise events for dynamically crated custom controls....
Thanks in advance for any tips/help how to solve it.
I'm using VB.NET
Ok I figured it out !
It is very simple actually.
If any one will be looking for an answer :
To access dynamically created control first we are going to name it :
Dim Control as new CustomControl
Control.Name = "Name" & Counter
Next after we've created new controls we are going to access it using:
Dim _Control as new CustomControl
_Control = Ctype(Me.Panel1.Controls("Name1"), CustomControl)
MsgBox(_Control.Name.ToString)
Viola
I still not sure about custom events for all controls on custom control (so where ever user click, there should be override event which returns something back, now I can only either click panel container (not labels/pictureboxes) from code inside user class, or event per control on custom control (but issue is that I want to pass data from custom control to user class).
Related
I have a created a custom user control which consists of 2 controls:-
Textbox
Listbox
The function of this control is to act as a dropdown list. Below is the image of the control:-
Problem
Now the problem i am facing is that if i insert this user control into a container control like a panel then the list gets hidden inside that container control.
and if i just create the user control outside the container control then it would interfere with the Tab Order (focus order) of the form.
Is there any work around where the user control exists in the container control and still shows the complete list without being hidden in the panel?
Edit i wrongly added c# instead of VB.NET
It can be achieved by having the list as ToolStripDropDown. Similar customization have been done in the following discussion,
Show control inside user control outside the boundaries of its parent
Hope this suits you.
For an app that uses user controls instead of forms and the first user control has a listview, where the user clicks or selects "Create New" Or Delete, what is the best way to transfer the data selected in the listview to the detail screen (separate User Control) where the data can be edited?
Can I just reference the list view in the first UC in the Details UC? something like:
ucHeader.lvSetups.FocusedItem.SubItems.Count = 0
from the ucDetail user control?
Saying which way is the best would produce a heated discussion with every ones opinion. However, here are a few ways I would tackle this. While there are more options, these are what I would do:
You should expose any information you want to read from a user control in the form of a property, readonly if you must. Just an example because I don't know what your object types are:
Public ReadOnly Property SelectedItem as object
get
Return Listview1.SelectedValue
end get
End Property
You can also use events to tell the parent of your user control that a selection was made. You can pass whatever you want in this event, even the selected object. If you don't want to pass the selected object, grab it from the property you created (like #1) in the event handler.
I've created one user control which have textBox & DatabGridView etc. When any user start typing in textbox then the filter is applied in DatabGridView. Now I want to add following features in this control how can I add these?
I want to use same control for supplier, customer, vendors on a single form, so I've placed it 3 times from toolbar. But for each control I want to fill different data from database. So what will be the best way to bind the control?
As we knew each table (customer,supplier & vendor) can have different columns, so I also need properties to set them. I've added property to my control but how can I ensure user has assign value in it? I.e. if user run the form and X property is not assigned to control then it should show message.
Note: I've tried it on control load event but didn't get any success because control's load event is occurred prior to form load and I'm assigning property on form load.
Please help....
I am writing a Windows Forms application in VB.NET. I have three forms: the main form, which shows a list of accounts, the account form which allows the user to view/edit the information for a specific account, and the policy form which allows the user to view/edit the information on a specific policy for that account. I want the forms to appear as if they are all the same window. Example: when the application starts, the user clicks an account name in the list box on the main form and clicks "edit". What I want to happen is that the window stays in the exact same place and stays the same exact size, only the content of the main form appears to be replaced with the content of the account form. Same thing if the user then chooses to edit a policy from the account form. When the user finishes and clicks "save", the main form comes back up. Through this entire use case, it would appear to the user as if they were viewing the same window the entire time, with the content of that window changing.
How can I do this? I have tried something like:
Dim newForm as New AcctForm
newForm.Location = Me.Location
newForm.Show()
Me.Close()
The problem is that if the user moves the original window, the new window appears where the parent form originally appeared, not where it ended up.
I see this is already in the comments, but what I have done in this case in the past is build each "form" in the application as a custom control. Then I have one actual form, and navigation works by changing which custom control is currently loaded on the parent form. To move from one screen/view to another, you remove the current custom control from the form's controls collection and add the new custom control.
I believe this is superior to manually setting the startup position and size, because you can use the form's .SuspendLayout()/.ResumeLayout() methods to hide the interim state, where there is no control loaded, from the user. This is harder to do when you want one form to be completely replaced by another.
This also makes it easy to set certain form properties in one place and have them be consistent for the application. You can even have an area on the form with controls that will now show in every view.
When using this pattern, I typically have each of my custom controls inherit from a common base. You may not have anything specific you will do with that base at the outset, but it almost always comes in handy later.
Finally, switching to use this scheme is easier than you think. Just go to the code for the each of your current forms, and you will find that each class currently inherits from System.Windows.Forms.Form. Most of the time, all you really need to do is change them to inherit from System.Windows.Forms.Panel and you're most of the way there.
As others have said, it may be better to redesign your application using custom controls or panels etc.
However, to answer your question regarding the seemingly random location of your forms, the first thing to check is that each form has it's StartPosition property set to Manual.
If your main form is resizable, then I would also add code to adjust newForm to the same size too.
I hope that helps with your immediate issues; so that you can move on to redesigning the application!
good morning there is another way . set property for second form to (top most) and use also
from2.show();
that make you switch between forms and keep form2 top other
Thanks
try using ShowDialog()
Dim newForm as New AcctForm
newForm.Location = Me.Location
newForm.ShowDialog()
Me.Close() <-- removed this
I have a tabcontrol that creates tab pages from a "User Control" I created (a separate form in vb.net) using this code: (MainTab is the separate user control I created which has text boxes etc in it)
Dim tmpTab As New MainTab
myTabControl.TabPages.Add()
Dim tmpTabCount As Integer = myTabControl.TabPages.Count
myTabControl.TabPages.Item(tmpTabCount - 1).Controls.Add(tmpTab)
myTabControl.TabPages.Item(tmpTabCount - 1).Text = "Untitled"
I'm using the devexpress xtratab control so the code might look a bit different than the default vb.net tab control.
Now in my MainTab user control file file, I can't for the life of me figure out how to call a control in the form1 where the xtra tab control is placed on. "Me.Parent.Dispose" works for closing the tab when executed via the MainTab control, but that's as far as I can get for communicating with the parent from.
Does anyone know the solution? I'm not sure if I have to reference something in the MainTab user control or what in order to communicate with any objects on the default form1.
Generally speaking, I avoid making my child controls cognizant of the parent. It leads to unpleasant coupling more often than I care for.
Consider adding a custom event to your MainTab class that your form can subscribe to. When you want to pass a message to the form, your user control can invoke the method, and your form's event handler can process it accordingly. This pattern helps keep your user control pluggable into other forms by reducing its dependency on its parent.
Creating a user control event in a windows form is discussed in this MSDN article:
http://msdn.microsoft.com/en-us/library/aa302342.aspx