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
Related
I currently have a basic click button in WPF which the user can press in order to search I want to add a keydown event. When using standard VB I can
simply implement an e.keycode, but because I'm using WPF it seems to be different. I have included my basic click function below, could someone add to it just so it accepts the enter key as well?
Private Sub BTNSearch_Click(sender As Object, e As EventArgs) Handles BTNSearch.Click
Dim latitude As Double = Double.Parse(TXTLat.Text.Substring(0, TXTLat.Text.IndexOf(","c)))
Dim longitude As Double = Double.Parse(TXTLong.Text.Substring(TXTLong.Text.IndexOf(","c) + 1))
Dim location = New Microsoft.Maps.MapControl.WPF.Location(latitude, longitude)
Dim Pin = New Microsoft.Maps.MapControl.WPF.Pushpin()
BingMap.Children.Add(Pin)
Pin.Location = location
BingMap.Center = location
BingMap.ZoomLevel = "18"
End Sub
Buttons are not really designed to handle keyboard input. If you want a key event to trigger the button you should consider using InputBindings to trigger an ICommand that both a KeyBinding and the button are bound to, like this:
<Window>
<Window.InputBindings>
<KeyBinding Key="F5"
Command="{Binding MessageCommand}" />
</Window.InputBindings>
<Button Command="{Binding MessageCommand}">Click Me</Button>
</Window>
The Window would have its DataContext set to a ViewModel with a MessageCommand property of an ICommand that implements the behavior of the button.
A very good tutorial on input binding can be found here.
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'm stuck on this issue, please help.
I created an user control named "CreateNewCase_uc" within which I created a button Close named "btnClose"
In my MainWindow, I created a Grid named "grid1" and a button Open named "btnCreateNewCase" with this code
Private Sub btnCreateNewCase_Click(sender As Object, e As RoutedEventArgs)
Dim cnc As CreateNewCase_uc = New CreateNewCase_uc
grid1.Children.Clear()
grid1.Children.Add(cnc)
End Sub
My question : which Code I need to Write for my bntClose button which is inside the user control to close or make disappeared the user control in VB.NET
Thanks in advance for your help.
You need to get the Parent control then remove it.
' from inside your close button on UC.
Dim parent = TryCast(Me.Parent, Grid))
If Not parent Is Nothing Then
parent.Children.Remove(Me)
End If
You may simply set the UserControl's Visibility to Collapsed:
Private Sub btnCreateNewCase_Click(sender As Object, e As RoutedEventArgs)
Me.Visibility = System.Windows.Visibility.Collapsed
End Sub
I'm just starting to learn VB and Visual Studio and I've run across a problem. I've spent the best part of a day trying to find the answer and I have a horrible feeling that it's going to be something very simple that I've over looked.
I'm working on a WPF in Visual Studio 2010 and am trying to dynamically create a button on the main window when a button is clicked (I know, everything I've read tells me this is pretty basic!) Here's an edited snippet of the code I've written:
Imports System.Data.OleDb
Imports System.Windows.Forms
Imports Excel = Microsoft.Office.Interop.Excel
Class MainWindow
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles edit.Click
...
Dim newButton As New Button
newButton.Text = "New Button"
newButton.Top = 200
newButton.Left = 20
Me.Controls.Add(newButton)
...
End Sub
To my eyes, this looks perfectly simple and correct, but I'm getting an error:
"'Controls' is not a member of 'myApp.MainWindow'."
Has anybody come across this before or know what the problem is? Apologies if this does turn out to be a simple fix :)
The error you are getting is telling you that Controls does not exist within MainWindow. Basically, there is not property by that name accessible from your event handler. If you are working with WPF and MainWindow inherits Window, then you need to set something within the Content property.
The best way to go about this, would be to have some form of container control as the content of the window. You can define this in XAML or in code (via code you should set the Window.Content property). Then, you can add more controls to that container. Suggested containers are Grid, Canvas and StackPanel, etc.
I would suggest something like this:
XAML
<MainWindow ...>
<StackPanel x:Name="ControlContainer">
<Button Content="Click me to create buttons!" Click="CreateButton_Click" />
</StackPanel>
</MainWindow>
Code Behind
Private Sub CreateButton_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim button As New Button()
' Initialize the button
' ...
' Add the button to the stack panel
Me.ControlContainer.Children.Add(button)
End Sub
well MainWindow is not a form. create a new project and copy the same code in a button it will work.
you must find out what is the problem with your form control.
It looks like you are mixing WinForms and WPF coding - these are two different technologies.
This link may help you to add a button at runtime in WPF
In order to take advantage of the spell checking ability of WPF textboxes, I have added one to a user control (with the use of elementhost). This user control is used in various window forms. My current problem is trying to handle keyup events from this textbox but the windows form is unable to "get" any event from the control. I can access the properties of the textbox just fine (i.e. text, length, etc.) but keyboard events don't seem to work.
I have found, however, that the following will bring back events from the WPF textbox:
Public Class MyUserControl
Private _elementHost As New ElementHost
Private _wpfTextbox As New System.Windows.Controls.Textbox
Private Sub MyUserControl_Load(...) Handles Me.Load
Me.Controls.Add(_elementHost)
_elementHost.Dock = DockStyle.Fill
_elementHost.Child = _wpfTextbox
Dim MyEventInfo As EventInfo
Dim MyMethodInfo As MethodInfo
MyMethodInfo = Me.GetType().GetMethod("WPFTextbox_KeyUp")
MyEventInfo = _wpfTextBox.GetType().GetEvent("PreviewKeyUp")
Dim dlg As [Delegate] = [Delegate].CreateDelegate(MyEventInfo.EventHandlerType, Me, MyMethodInfo)
MyEventInfo.AddEventHandler(_wpfTextBox, dlg)
End Sub
Public Sub WPFTextbox_KeyUp(ByVal sender As Object, ByVal e As RoutedEventArgs)
' something goes here
End Sub
End Class
The user control is now able to do something after the PreviewKeyUp event is fired in the WPF textbox. Now, I'm not completely sure how to have the window form containing this user control to work with this.
Im a C# person not VB so please bear with me.. Basically you could assign the event from your Window rather than within your UserControl.. So in the constructor of your Window assign the PreviewKeyUp:
this.myUserContorl.PreviewKeyUp += new System.Windows.Input.KeyEventHandler(WPFTextbox_KeyUp);
then place the event handler in your Window:
private void WPFTextbox_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
{
}
Incidentally you needn't go through the hassle of capturing the event in your UserControl as you can still access your TextBox within you UserControl directly from your Window (if you make it public), again from your constructor in your Window:
this.myUserContorl.wpfTextbox.PreviewKeyUp += new System.Windows.Input.KeyEventHandler(WPFTextbox_KeyUp);
I imagine it would look like this in VB (at a guess):
AddHandler myUserContorl.wpfTextbox.PreviewKeyUp, AddressOf WPFTextbox_KeyUp
ElementHost has a static method called EnableModelessKeyboardInterop(). Try calling it?
ElementHost.EnableModelessKeyboardInterop();
Read more here
Seems basic, but did you set the KeyPreview to TRUE on your form?