I have a main form, which opens form A, where from form A I can open form B, where from form B I can open form C. The problem is that if I open till form B, everything works fine, but if I open form C as well, and then close Form C and B, form A goes behind the main form. For the forms I m just creating an instance of the form and then use .Show()
cNewForm form = new cNewForm();
form.Show();
I m doing this for every form
You have not set the window ownership properly because you are using the no parameter version of Show(). You need to set the owner by calling the Show() overload that receives an owner parameter. Alternatively you can set the Owner property directly, but it's much better to do so when you call Show().
The window owner is an important Win32 concept. I recommend reading the MSDN documentation on the subject.
An owned window is always above its owner in the z-order.
The system automatically destroys an owned window when its owner is destroyed.
An owned window is hidden when its owner is minimized.
In your case I think you want form A to be owned by your main form, and form B to be owned by form A, and form C to be owned by form B.
I have often found that these kinds of issues are resolved by assigning owners to windows. When you show the window:
FormA formA = new FormA();
formA.Show(this); // assuming this code is in the main form
try to use the ShowDialog(); methode instead of show() in order to show it as a modal form. see the documentation
Related
My main form is this
Now my problem occurs when I click Add -> Student, which is meant to bring up a new window that, instead it does this
So as you can see it opens the new form inside the same window. It didn't use to do this, then I made the main form an MdiContainer and set it as the MdiParent of the second form.
Is there a property I can change to make this new form pop up in a new window? Becuase I need to leave the MdiContainer property as True so that I can take data from Form2 and use it in Form1
Please let me know any other information you may need to help me fix this issue, as I'm not sure what caused it so I don't know what to change in order to fix it or even where I'm meant to be looking
you need to hide form enroll
when you open add window add.show()
you need to hide enroll form enroll.hide()
I want to do something like the answer here:
How can I close a login form and show the main form without my application closing?
...but I want to pass a value selected on the initial form to the next (main) form. If I call an overridden constructor on the main form, where do I store the value in the meantime (between the initial form being dismissed and the main form being called)?
OTOH, if, instead of using the program.cs file to do this, I create the "initial form" inside the main form's Load() event (is there a better place), I could do something like this, but admittedly it seems rather kludgy:
0) Set the main form's size to 0,0 to hide it
1) Show the "initial" form/modal dialog, and store the value the user selects (in a button click event) in a form-global variable
2) Once the initial form/modal dialog closes, set the main form's size back to what it should be (unless modal result <> OK, in which case I close the main form and the app)
I know there's a better way to do this...
You don't have to pass a value to the main form. Just like your link explains, open your main form first. Then your main form can open the other form. This other form can place the information in a public property that the main form can access. Since the main form controls the lifetime of this other form, the main form gets the information held in the other form's public property, then closes the other form.
string myVariable;
using (OtherForm otherForm = new OtherForm())
{
otherForm.ShowDialog();
myVariable = otherForm.OtherVariable;
}
Try using ApplicationContext (System.Windows.Forms.ApplicationContext). You can show multiple forms as shown in the example in the following MSDN thread. And regarding data,you can have a common data object which is created once and the forms are instantiated with the data object passed to them before showing them.
http://msdn.microsoft.com/en-us/library/system.windows.forms.applicationcontext%28v=vs.100%29.aspx
I want to make an application that have one main form that have one functionality = Add new form.
I dont know how forms will be created, they are created dynamically by the user (AddForm methos from the main form).
All the subs forms are the same but some of thier prop receive differnce parameters (it can be in the ctor or later).
I want to be able to close all the forms when I close the main form.
Before new form will displayed I want to display setting form (to take the form parameters) maybe with ShowDialog method and do validating check on the form and just if the form validate the new form will displayed, if not (or if the user prees cancel) the form will disposed.
I know aboout MDI but I really perfer other way
Any ideas?
Thanks!
Closing all forms when main form is closed is somewhat easy, you just pass the main form reference in Show() method of the "child" forms; e.g. if you show child from main, you do:
child.Show(this);
This needs to be done if the your main form is not the real "main form of the program", but you want to close all "child" forms.
However, wiring all this together would preferably be done in some special class for this purpose, maybe called ScreenRepository. In this class, you would have a collection of open forms at any moment, you would deffer form creation to this class (so that this class automatically injects form parent) etc... Having this class would be easy to re-activate (give focus) the form if it is behind other forms, create new form if needed etc...
Idea is simple create a application that open a main form a the beginning and then open open other forms if needed if you close main form rest of forms are also closed. Like in GIMP.
I have found the Form.TopMost property but it puts the form on top of everything, including stuff that isn't part of my app. I've got a suspicion that I'm missing something obvious here. (Is Form the proper bases class for a non modal dialog box?)
Use the Form.Owner property of your dialog form and set it to the main Form.
Read more here
http://msdn.microsoft.com/en-us/library/system.windows.forms.form.owner.aspx
The Owned form will never be displayed behind the Owner Form.
It is very simple; You just have to pass the owner when you call the Show() method
YourForm.Show(parentForm);
You can specify parent-child relationships between windows by supplying the parent Form as parameter to the ShowDialog() method called on the child Form. The child window will then stay on top of the parent and also minimize and restore along with the parent.
If i understand you correctly your opening a form from your application, and you want your new form to be on top of the old one.
To do this you can use ShowDialog() and StartPosition
SomeForm MyNewForm = new SomeForm();
MyNewForm.ShowDialog();
this will make that form stay on top of the orignal one, and you can also use
MyNewForm .StartPosition = FormStartPosition.CenterParent;
To control where that new form shows on the screen.
Thinking about this for an About dialog but I'm sure it's applicable in other places (say a find box)
Sorry if this is a dupe, but I couldn't find this or how to articulate the last part about it only being on top of the parent. How do you make a form that is always on top of the parent form, but is non-modal, but doesn't cover up other apps?
Try this to open your dialog:
FindDialog fd = new FindDialog();
fd.Show(this);
The key is to assign dialog's owner.
Not sure exactly what you mean; Form.ShowDialog is only modal with respect to the parent, not the application, unless the application is single threaded.
For example, I made an app to test this which was organized like the following:
mainform:
2 buttons, each of which begins a thread that creates a frmDialog1 and calls ShowDialog
frmDialog1:
single button which creates a frmDialog2 and calls ShowDialog on it.
frmDialog2:
does nothing (ie. blank)
when they were all running I could access/drag mainform. I could also do the same with frmDialog1 (both versions) only if I hadn't clicked the button that shows dialog 2.