Say I have two WPF Windows. WindowA and WindowB. Each Window has two buttons. A Open button which will SHOW the other Window and a Close button that will Close the other Window (vice versa).
Example WindowA I have the following click event and sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
WindowB.Show()
CloseWeAidWindow()
End Sub
Public Sub CloseWeAidWindow()
Dim CloseWindow = Window.GetWindow(Me)
If CloseWindow IsNot Nothing Then
CloseWindow.Close()
GC.Collect()
End If
End Sub
However it closes the entire application and not just WindowA. WindowB opens for about .5 seconds.
How can I open another window and close the current window?
Sounds like your Application.ShutdownMode is set to OnMainWindowClose. If you want to the app to remain open as long as any window is visible try OnLastWindowClose.
Related
I need to use "Show()" method for dialog winform using Ironpython
and i need to get result of button pressing and use it in another part of program
how can i wait for pressing OK in modal "Show()" dialog?
mform = Form3()
mform.Show()
# How to wait for button OK
Thx
Use ShowDialog() instead of Show().
Then check "if (mform.DialogResult == DialogResult.OK)"
Suppose you have a main form called Form1 and a secondary form called AddForm which presents some result when the [OK] button is pressed.
The main form then can subscribe to the FormClosed event of the secondary form and pull the result if the user clicked on the [OK] button.
This can all happen in the subroutine where the secondary form is shown
Private Sub Button1.Click(sender as Object, e as EventArgs) Handles Button1.Click
Dim dlg as New AddForm
AddHandler dlg.FormClosed, _
Sub(e,ev) TextBox1.Text = If(dlg.DialogResult = DialogResult.OK, dlg.Result, String.Empty)
dlg.Show()
End Sub
And in the secondary form make sure there is a property called Result which contains the results
The [OK] button has a handler like so
Private Sub Button1_Click(sender as Object, e as EventArgs) Handles Button1.Click
Result = ...
DialogResult = DialogResult.OK
Me.Close()
End Sub
and the [Cancel] button has a handler as so
Private Sub Button2_Click(sender as Object, e as EventArgs) Handles Button2.Click
DialogResult = DialogResult.Cancel
Me.Close()
End Sub
I have a windows application with 2 forms.
frmMain has a button (btnEditAgent) on it that opens frmEditAgent:
Public Sub btnEditAgent_Click(sender As Object, e As EventArgs) Handles btnEditAgent.Click
frmAgentEdit.ShowDialog()
End Sub
Then on frmEditAgent load:
Private Sub frmAgentEdit_Load(ByVal sender As Object, e As EventArgs) Handles MyBase.Load
MsgBox(sender.Name, vbOKOnly, "verify")
End Sub
The sender comes back as "frmEditAgent" and not "btnEditAgent"
I do not understand why this is happening. In order for the rest of my code to work I need to know which button opened frmEditAgent. Why is sender referring to the same form?
The sender of the Load event is the Form that was just loaded. The semantics of sender wouldn't make sense otherwise.
Think of it this way: the button opens the form, but the form does its own loading, and so calls its own Load event with itself as the sender.
If you want to know which button opened the form, then you can add an instance variable to your dialog form's class and then just set that variable in btnEditAgent_Click.
frmAgentEdit can then just use that instance variable to know which button caused it to be opened.
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.
Im using Visual Basic 2008
I have 2 forms
Main, EditCustomerInfo
Main form contains the following
Public Class Main
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
EditCustomerInfo.ShowDialog()
End Sub
EditCustomerInfo contains a text box and the following
Public Class EditCustomerInfo
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Not CustomerIDTextBox.Text = "" Then
Me.Close()
Else : Me.Hide()
End If
End Sub
WHAT IT DOES:
So with this code alone when i debug the program it takes me to the main form and allows me to click a button to open the editcustomerinfo form
When im on the editcustomerinfo form i have a textbox and a button. If something is typed in the textbox and the button is clicked then the form hides, if nothing is typed in the textbox when the button is clicked then the form closes.
WHAT I WOULD LIKE IT TO DO:
If something is typed in the textbox i would like the button on the editcustomerinfoform to hide the editcustomerinfoform and also create a button on main form that allows the user to bring the editcustomerinfo form back up with what was typed in the text box.
Suggestions?
Automatic behavior, such as this, always worries me. How do you know when a user has completed their input without a lost focus event. If there are no other controls on the screen, then users won't readily know how to trigger the event. That being said, you can use a timer to delay the screen closing from a KeyPress event.
Public Class EditCustomerInfo
Private WithEvents userInputDelay As Timer = New Timer() With {.Interval = 1000} REM 1 second delay for next user input
Public ReadOnly Property CustomerId As String
Get
Return CustomerIDTextBox.Text
End Get
End Property
Private Sub CustomerIDTextBox_KeyPress(sender As Object, e As KeyPressEventArgs) Handles CustomerIDTextBox.KeyPress
userInputDelay.Enabled = False
REM Reset the timer
userInputDelay.Enabled = True
End Sub
Private Sub userInputDelay_Tick(sender As Object, e As KeyPressEventArgs) Handles userInputDelay.Tick
If Not CustomerIDTextBox.Text = "" Then
Me.Close()
Else : Me.Hide()
End If
End Sub
End Class
Add a button (Button2) to your Main. The code below will hide Button1 when the EditCustomerInfo.Textbox1.Text value is null/blank/white space. Button2's visibility is always the inverse of Button1.
Private EditCustomerInfoInstance As New EditCustomerInfo
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
EditCustomerInfoInstance.ShowDialog()
Button1.Visible = String.IsNullOrWhiteSpace(EditCustomerInfoInstance.CustomerId)
End Sub
Private Sub Button1_VisibleChanged(sender As Object, e As EventArgs) Handles Button1.VisibleChanged
Button2.Visible = Not Button1.Visible
End Sub
Our environment: Visual Studio 2010, c#, .net 4 client profile.
We have a Winforms application that contains a menustrip in its main form. The items of the menustrip contain both an image (64x64) and text. The main form also has a TabControl which contains 5 tabs. In the OnLoad() method of the main form, we hide the TabControl headers so that they are not visible and therefore not clickable. Instead, when the user clicks on an item in the menustrip, we switch the active tab.
However, our menus have many sub-menu items, and since we use the main menustrip to select the active tab, we would like the sub-menu items to appear only after the user clicks the menu item for a period of time, not instantaneously. Otherwise, whenever the user changes his/her active view (by selecting a tabPage), the sub-menus appear on the screen since he/she clicked a menustrip item that contains sub menus.
Is this possible?
I don't completely understand the rationale, but you can delay the display of a submenu using the MouseDown handler and sleep function, like this:
Private Sub FileToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FileToolStripMenuItem.MouseDown
System.Threading.Thread.Sleep(2000) ' wait two seconds
End Sub
======================
(Edit: Added second solution)
You can do this with a timer control and ShowDropDown/HideDropDown:
Private Sub FileToolStripMenuItem_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles FileToolStripMenuItem.MouseDown
' show tab here'
FileToolStripMenuItem.HideDropDown()
Timer1.Interval = 500
Timer1.Start()
End Sub
Private Sub FileToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FileToolStripMenuItem.Click
FileToolStripMenuItem.HideDropDown()
End Sub
Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Timer1.Stop()
FileToolStripMenuItem.ShowDropDown()
End Sub