I have a dialog window that I open from a record in a datagrid, this datagrid happens to be inside a Page that is navigated to inside a frame.
I have a button in this window, that when clicked, I would like to navigate the main window (which happens to be in a frame), to a different page that the datagrid is on.
How can I do this?
Here's the click code for the button:
Private Sub btnPlaceOrder_Click(sender As Object, e As System.Windows.RoutedEventArgs) Handles btnPlaceOrder.Click
Dim _M As New Main
_M.InnerFrame.Navigate(New ManualOrder())
Me.Close()
End Sub
figured it out for myself.
I needed to find the frame from the main application window in order to do this:
_F = Application.Current.Windows.Item(0).FindName("InnerFrame")
Related
I do not know how to specify in the title, this is in WPF visual basic. I want to know how do I write a code so that when a button is clicked, the tabcontrol selection will be = 1
Here is what I have in my MainWindow, RightWindowCommands:
<Button Content="Information" Cursor="Hand" Click="InformationButton_OnClick"
ToolTip="View the information"
x:Name="InformationView"/>
However, I did not use the WPF tools' Button, as this is a GUI that I have to place the button at RightWindowCommands, I want to know how to come out with the code so that InformationButton_OnClick gives me tabControl.SelectedIndex = 1. Please guide me on writing this code out
Here is a nice example for onclick event handling a picture, you can change it to a number instead of picture.
`AddHandler pic.Click, AddressOf pic_Click'
Private Sub pic_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim pic As PictureBox = DirectCast(sender, PictureBox)
' etc...
End Sub
Source : add on click event to picturebox vb.net
here is my problem: i have created a main window called mainWindow in XAML (vb.net) and inside i have 2 buttons (valid and stop) and a grid in the center.
I have two others little windows (valid window and stop window) written in XAML (vb.net) which have buttons, textbox...
I want, when i click on valid button or stop button, display the valid window or the stop window inside the grid of my mainWindow, so i have this code in my mainWindow.vb:
enter code here
Private Sub valid_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles valid.Click
Dim content As Object = valid_.Content /*Classe valid_ (a window in xaml)*/
valid_.Content = Nothing
Me.Grid.Children.Add(content)
End Sub
Private Sub stop_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles stop.Click
Dim content As Object = stop_.Content
stop_.Content = Nothing
Me.Grid.Children.Add(content)
End Sub
So when i click on button valid in my mainWindow, it's ok it displays the valid window in my grid.
First problem: then when i click on button stop in my mainWindow, the stop window is placed just above the valid window, it is not nice, is there a way to clear the grid before display this second window?
And finally, the biggest problem: i need to click many times on valid button or stop button but when i click the second time i have a null reference exception: Me.Grid.Children.Add(content) content is null after the first call so i am only able to click one time on my button.
How can i fix it in order to click many times on my buttons please?
I give you thanks.
Yet again, someone writes some invalid code and then says why isn't this code working? If you look at your code, you should see something:
Private Sub valid_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles valid.Click
Dim content As Object = valid_.Content /*Classe valid_ (a window in xaml)*/
Me.Grid.Children.Add(content)
End Sub
I'm guessing that you have a private variable for your Valid Window as you call it: valid. On this line, what are you doing to your variable?:
valid_.Content = Nothing
That's right! You're setting its Content property to null. Therefore, I'm not really sure why you were surprised that it was null after the first attempt.
How can i fix it in order to click many times on my buttons please?
Try removing the line that sets the Content property to null.
UPDATE >>>
Your problem is really caused by the fact that you cannot display any UI element in two places at once. Your whole idea of copying the Window.Content to your DataGrid is entirely wrong, but in the name of brevity, your fix is simply to move your content back to the Window, rather than setting it to null each time. Try something like this:
Private Sub valid_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles valid.Click
If Me.Grid.Children.Count > 0 Then 'Put content back where it belongs
Dim oldContent = Me.Grid.Children(0)
stop.Content = oldContent
Me.Grid.Children.Remove(oldContent)
EndIf
Dim content As Object = valid_.Content /*Classe valid_ (a window in xaml)*/
valid_.Content = Nothing
Me.Grid.Children.Add(content)
End Sub
Please forgive any code mistakes, as I don't write VB.NET. Also, you'll need to update your other method likewise.
In my project I've got a MainWindow that opens up a second Window. Inside the second Window there is a Frame and I start a navigationservice inside the Frame. Also in the second Window I've got a KeyDown method that calls Me.Close when the user presses the Escape key. Anyway, when the second Window closes a System.Windows.Threading.DispatcherTimer() inside one of the pages in the navigation service doesn't end. Any ideas on how can I close the second Window and terminate the DispatcherTimer inside the navigationservice?
Thanks
Mike
p.s. I can supply source code if anyone wants to look at what I've got...
(Hey EkoostikMartin - this is a follow up to your comments..)
So I've made some progress on this. I've add:
AddHandler Me.KeyDown, AddressOf Page_KeyDown
AddHandler Me.PreviewKeyDown, AddressOf Page_PreviewKeyDown
to the Page that has the timer. And inside the page I've defined both methods like:
Private Sub Page_KeyDown(sender As Object, e As KeyEventArgs)
If e.Key = Key.Escape Then
dTimer.Stop()
MessageBox.Show("Exit Page")
End If
End Sub
Private Sub Page_PreviewKeyDown(sender As Object, e As KeyEventArgs)
If e.Key = Key.Escape Then
dTimer.Stop()
MessageBox.Show("Exit Page")
End If
End Sub
And the second Window has this:
Private Sub Window_KeyDown(sender As System.Object, e As System.Windows.Input.KeyEventArgs)
'Escape Key Exits Program
If e.Key = Key.Escape Then
Me.Close()
End If
End Sub
So when I'm in the navigation service and navigated to the page with the Timer and I press "Esc" I get the message "Exit Page" and then the Window closes. This is good!
(I don't think I need both the KeyDown and PreviewKeyDown. When I press "Esc" I'm actually getting two "Exit Page" pop-ups)
There is a problem though: It seems like the Page doesn't get the KeyDown events unless I move the focus to a textbox or combobox and if I don't do this pressing the "Esc" key calls the second Window's Window_KeyDown and not the Page's KeyDown event which means the timer on the page doesn't get stopped even after the second Window is closed. Does anyone know a way to get the page focus when the page loads so that I can get the KeyDown event without manually changing the focus to a control on the Page?
Thanks!
Ok - I finally resolved this situation by way of a work around. In my second Window I've created a list of type DispatcherTimer:
Public clndTimer As New List(Of System.Windows.Threading.DispatcherTimer)
I can access this list from a Page that is inside my Navigation service. Here's the code in the Page:
Dim dTimer As New DispatcherTimer()
dTimer.Start()
Dim wSecondWindow As New SecondWindow
wSecondWindow = Window.GetWindow(Me)
If wSecondWindow IsNot Nothing Then
wSecondWindow.clndTimer.Add(dTimer)
End If
And then I capture the key event in the second Window. This is the method in the second Window:
Private Sub Window_KeyDown(sender As System.Object, e As System.Windows.Input.KeyEventArgs)
'Escape Key Exits Program
If e.Key = Key.Escape Then
For Each dt In clndTimer
dt.Stop()
Next
Me.Close()
End If
End Sub
Doing it this way I don't need either the Page_KeyDown or PreviewKeyDown methods in my Page which is good because they were behaving unreliably. (see answer above)
So what do you think? I'm not totally sure about the way I get the Second window or how I check it for null in the Page but otherwise this seems to make sense.
Thanks!
I am developing a WPF project in vb.net and have multiple windows in it. When user selects a menu item a new windows opens and the problem is when the user clicks on other menu item the current window should close by itself.
How do i achieve it?
Thanks!
I think you mean this based upon your comment:
Class MainWindow
Public Win3 As Window3 = New Window3()
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
Win3.Show()
Me.Close()
End Sub
End Class
There are two ways to do this:
If the menu items share the same form then in the form create a subroutine, that you call instead of new, that checks if it is already shown/created and if not opens (as you already have). If it is open reload with the new information.
Otherwise before opening the new form go though the open forms (shown below from this website in C#):
FormCollection fc = Application.OpenForms;
foreach (Form frm in fc) {
//iterate through
}
For each form check if it's name is equal to one of the menu items and if it is close it (after saving if required). Then after you exit the for loop you open the new menu item.
I have created a custom window set to windowStyle="none", (no title or maximize - minimize buttons) and i am trying to implement a DragMove operation when the user clicks and drags on a grid. (this is wired up by calling DragMove on a MouseLeftButtonDown Handler)
First weird issue that this event nevers gets fired if the grid has no backround.
Adding some background color does make the event to get fired, but after the first drag i get this error:
"Can only call DragMove when primary mouse button is down"
Code Snipet:
Private Sub Grid1_MouseLeftButtonDown(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseButtonEventArgs) Handles Grid1.MouseLeftButtonDown
DragMove()
End Sub
I know that this would work fine for a label, but isnt there a way to make it work for a grid?
OK, I found the answer..
I used a border to wrap the grid and then caught the Border1_MouseLeftButtonDown event.
I also had to set the borders Background to "Transparent", and now everything works like a charm.
Private Sub Border1_MouseLeftButtonDown(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseButtonEventArgs) Handles Border1.MouseLeftButtonDown
DragMove()
End Sub