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!
Related
i have textbox multi way to fill it
i can fill it from keyboard normally and the other way by clicking button i created on forum something like calculator
when i click button 1 the textbox fill by number 1 and so
and i have button name and work should be like enter key
i have event keydown to send the value i fill it on the text box and work fine
but i need the button that called enter work as the event keydown of the textbox
in short word i need to use touchscreen to enter number to textbox and button to send the value of the textbox to my work
If you want to execute the same code at two different occasions you should put your code in a separate method and then call that at will.
By dividing your code like this you improve both readability and debuggability, and you make your code easier to understand and update.
Here's a brief example:
Private Sub TextBox1_KeyDown(sender As Object, e As System.Windows.Input.KeyEventArgs) Handles TextBox1.KeyDown
If e.Key = Key.Enter Then
UpdateStatus("Enter was pressed.") 'Call custom method.
End If
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
UpdateStatus("Button1 was pressed. Hello World!") 'Call custom method.
End Sub
Private Sub UpdateStatus(ByVal Text As String) 'Custom method declaration.
TextBox1.Text = Text
'In here is where you'd put your code.
End Sub
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.
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")
I'm trying to have my context menu stay on screen even after I click one of its dropdown items (when the shift key is pressed, though I don't think that matters to the issue). You can see an example of the behavior in Windows XP when you click on Start > All Programs > Accessories > [now hit your shift key] and click on Windows Explorer... The menu stays up.
It's a C# app, using Winforms, development machine is Windows 7, production is either XP, Vista or 7.
The toolstripmenuitem doesn't seem to have a closing event; only a closed one. Those familiar with a closing event will know that you can set a cancel flag to prevent the control from closing.
Also, when I try a workaround of remaking it visible from within either its click event or its closed event, it doesn't work. Although that would have been a tolerable workaround in the immediate, it is not for production.
Any suggestions or related info greately appreciated.
Thank you
I was able to have a dynamically created submenu of my ContextMenu stay on screen upon being clicked by setting the AutoClose property of its Parent DropDown menu to "False" like this:
ParentMenu.DropDown.AutoClose = false;
where ParentMenu is a ToolStripMenuItem.
The use of the Closing event of the DropDown's Parent ToolStripDropDownMenu to acheive this by setting a "Cancel" flag was not a viable solution because it caused inconsistant showing/hiding behavior in either of its 2 levels of Parent menus as well as causing unexpected visual artifacts on screen that I could not get rid of when later being hidden through code. It also seemed to cause certain events of the dynamically created menu's Parents to no longer fire, such as its MouseEnter event.
An interesting find during this experience was that although Visual Studio 2010's intellisense lists a LostFocus event for a DropDown of a context menu item; when adding this event to dynamically created menus it does not get fired; this is apparently a known behavior as mentionned here:
Here's what I ended up using. With this method, the dropdown's autoclose is only disabled while the mouse pointer is on the drop down control. MyMenuItem is type ToolStripMenuItem.
AddHandler MyMenuItem.DropDown.MouseEnter, AddressOf DisableDropMenuClose
AddHandler MyMenuItem.DropDown.MouseLeave, AddressOf EnableDropMenuClose
Private Sub DisableDropMenuClose(ByVal sender As System.Object, ByVal e As System.EventArgs)
CType(sender, ToolStripDropDownMenu).AutoClose = False
End Sub
Private Sub EnableDropMenuClose(ByVal sender As System.Object, ByVal e As System.EventArgs)
CType(sender, ToolStripDropDownMenu).AutoClose = True
End Sub
The ToolStripDropDownMenu has the Closing event.
private void MyContextMenuStrip_Closing(object sender, ToolStripDropDownClosingEventArgs e) {
if (e.CloseReason == ToolStripDropDownCloseReason.ItemClicked) {
e.Cancel = true;
}
}
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