I am using Visual Studio 2012. I have added reference to System.Windows.Forms. But I cannot find Form.Shown event handler in the properties-eventhandler window.
Please help me.
Is there any alternative for the same?
When you are using WPF, you can not use WinForms. Those are not the same. You must use the Events from the Window class in WPF.
I assume you use WPF since the WPF tag is there.
For a WPF window I would use one of the following events:
Activated Occurs when a window becomes the foreground window.
GotFocus Occurs when this element gets logical focus.
Loaded Occurs when the element is laid out, rendered, and ready for interaction.
StateChanged Check if WindowState == WindowState.Normal
The WPF equivalent handlers you are possibly looking for are Loaded() and/or Activated(). You might also look at SizeChanged()
Related
I have a problem in my wpf project. I have a webbrowser control. What I want is to know whether anybody has clicked on the webrowser control. I used the mousedown event. But to my surprise it is not firing the event. In the webbrowser control I find that only Navigated and Navigating events are fired. Please let me know how can I get mousedown event? Thanks for your time.
Mouse events are not supported by the WebBrowser control. Please refer to the following (duplicate) question for more information about how you could solve this.
WPF WebBrowser Mouse Events not working as expected
MACMAN, add event handler manually, like this:
public MainWindow()
{
InitializeComponent();
AddHandler(FrameworkElement.MouseDownEvent, new MouseButtonEventHandler(WebBrowser_MouseDown), true);
ps: See this topic: https://social.msdn.microsoft.com/Forums/en-US/61807025-d4c4-41e0-b648-b11183065009/mousedown-event-not-working-wpf?forum=wpf
I got the solution by injecting javascript that adds a html mousedown event to the website. The javascirpt in turn invokes a wpf function that is written into a class using ComVisible[true].
http://sekhartechblog.blogspot.in/2012/04/webbrowser-javascript-communication-in.html
I have a custom control which inherits from Control and I'm trying to trigger MouseLeftButtonDown using Touch on WPF platform.The event MouseLeftButtonDown does not fire while touch the window but its works fine when use mouse device. I have tried the related PreviewMouseLeftButtonDown event also nothing happens while touch the window.
Please suggest me the solution.
Regards,
Jeyasri M
Already in another post
WPF combining MouseDown and TouchDown to same event
Anyway have a look to this, maybe can help...
https://blogs.msdn.microsoft.com/llobo/2009/12/07/wpf-touch-basics/
https://blogs.msdn.microsoft.com/jaimer/2009/11/04/introduction-to-wpf-4-multitouch/
I have an problem. I have tabitems and if these items have images in the in the header, the window_loaded event is triggered before the window become visible. If the tabitems are just plain old tabitems, the window is visible before the loaded event. Does anyone know why is that happening?
As described here, I believe that you really should be using Window.ContentRendered instead of Window.Loaded
#StillLearnin thanks for pointing to the right direction.
Instead of using Window_Loaded event I used Window_ContentRendered
I want to give the user the option to use a tutorial, the first time he uses the program. I tried adding it in the Form.Load event, but the forms shows up after the Messageboxes have popped up.
That's why I would like to know, are there any events fired right after loading a form?
If not, is there a way to perform actions right after loading?
You should try the shown event, which fires after the form is shown for the first time.
Load happens before the form is shown.
You could try using the Shown event but that might be a bit early too based on what you are doing but it does occur after the Load.
If you have any controls on the page you could trigger it off the controls GotFocus event. Just make sure to put in checks to only do it once if using the GotFocus method.
MSDN Form.Shown
MSDN Control.GotFocus
MSDN Reference to order of events
System.Windows.Forms.Control.HandleCreated
System.Windows.Forms.Control.BindingContextChanged
System.Windows.Forms.Form.Load
System.Windows.Forms.Control.VisibleChanged
System.Windows.Forms.Form.Activated
System.Windows.Forms.Form.Shown
The Shown event should do this for you.
I need to execute code before a wpf user control is unloaded and cancel the unloading if certain conditions are met and keep the control open in its current state in the ui...
Is there any way I can accomplish this? I couldnt see anything like unloading event?
Thanks,
Unloaded is fired when the control is removed from the WPF visual tree. As far as I've been able to read there is no "Unloading" event as there is, I think, in Windows Forms. But, "Unloaded" doesn't mean that the control is destroyed, just that it's removed from the visual tree.
Keep a reference to the control in a separate place in your code, along with a little bit of metadata about its parent control. You can probably collect that metadata by storing a reference to the Parent property in your Initialized event handler.
Then, when Unloaded is called, make your tests in the Unloaded event handler, and if your conditions are met, re-insert the control into the logical tree. The ContentControl class has an explicit AddChild protected method you could call.
There are probably some side effects to watch out for; According to the documentation, Unloaded is called when themes are changed at the OS level, when the WPF visual tree reconstitutes itself.
There is an Unloaded event on System.Windows.Controls.Control, but I don't know an elegant way to stop unloading the control with it.
private void UserControl_Unloaded(object sender, RoutedEventArgs e)
{
if (ConditionsMet) { e.Handled = true; }
}
If ConditionsMet the Unloaded event will be set to true henceforth keeping your control in the VisualTree - your control does not Unload