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
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.
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;
}
}
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