Sorry first, because I see another question, but both of the ans. and ques. is not clear enough
How can I raise a parent event from a user control in WPF?
In my MainWindow.xaml, I had a right Panel
<local:RightSideContent x:Name="RightPanel" Grid.Column="1">
So in the MainWindow.xaml.cs, if I want rise an event to this panel, I made the code like this:
public delegate void Event1();
public MainWindow()
{
this.InitializeComponent();
Event1 obj = new Event1(this.RightPanel.func);
obj();
// Insert code required on object creation below this point.
}
And in RightPanel class, I declare the function func
The question is: if I am in the RightPanel Class, how I raise an event to the MainWindow, because I can't wrote something like this.RightPanel.func.....
And by the way I am in another class that do not have xaml file, if I want raise an event to a UserControl, how can I do?
Sorry, I don't quite have enough rep to post a comment to clarify, but as I see it, there are three possible things you are trying to do here.
You are trying to trigger an event on MainWindow, from some code that doesn't reside in MainWindow. In which case, you need to make sure that you have a reference to MainWindow, and that there is a public method on MainWindow that will trigger that event.
You want MainWindow to handle a click etc that comes from RightPanel. In that case you simply put a Button.Click="blah" (or whatever the event is) attribute on your MainWindow, and it will catch any button clicks from below it that are not handled lower down. In fact you can even handle it lower down and make sure that you set the EventArgs so that it is effectively unhandled, so that you can then handle it higher up as well.
You want to be able to handle a custom event generated in RightPanel, in a similar way to the way you would the button click scenario from item 2 above. In this case, I would direct you to http://msdn.microsoft.com/en-us/library/ms742806.aspx which is the documentation for Routed Events in WPF, and you should be able to work out how to create your own RoutedEvent from there.
Related
I'm working on c# WinForm.
I have an custom UserControl : MyControl : UserControl, INotifyPropertyChanged. I attached a method on event on event VisibleChanged : this.VisibleChanged += new System.EventHandler(this.MyControl_VisibleChanged);
My application have some pages, each page is a control like MyControl. Top of MainWindows contains Button, used to switch tab.
My problem is that my function MyControl_VisibleChanged is called only when Visible is changing to true. I added a test in a tab to check MyControl.Visible, when I select the other tab, MyControl.Visible is false but no event is raised.
I've try to define a new property Visible for this control but value is never set, only the base value is modify.
Can you help me to find a solution ?
This is a quirk in the way Visible works, explained here. His solution was to use properties that he has complete control over, but you could instead have a method allowing the tab switches to tell their children to raise their VisibleChanged event that extra time.
The first two answers to this question may also be useful.
I'm working on a semi-professional project and needed a custom view for one of my models. As far as I could figure out that meant creating a UserControl-inherited class, like so:
public partial class PopulationView : UserControl
{
...
}
Now this works wonders, and I've been able to do pretty much all I wanted, including custom painting with onPaint but I've noticed none of the events seem to be registering. I've had to attach multiple event listeners and in all instances I end up going back to my form and adding an event listener to my custom component's instance in the form. For example, I'd like to add a Click event listener. What I try first is simply
public partial class PopulationView : UserControl
{
private void PopulationView_Click(object sender, EventArgs e)
{
Debugger.Break();
}
}
of course attaching the function to the Click event through PopulationView.cs [Design]. That doesn't work so I end up adding a Click event listener on the instance of the component and adding the PopulationView_Click function to my form (MainForm.cs [Design]) instead and launching the appropriate function on the control.
I feel that I'm missing something very simple which is preventing me from being able to register events in my control directly and I'd appreciate any help with this. I dug around the interwebs but couldn't find anything relevant.
Update
Some of the comment make me think I should provide more detailed information about what I'm doing. The setup is sort of complicated but here's a summary:
I have a custom control inheriting from UserControl, called PopulationView
I have an instance of that control added to a form
Attaching event listeners through the design view of the form to the instance of the control (listener in form itself) works. Adding them through PopulationView's design view (listener in PopulationView) does not.
What complicates thing is I have a BackgroundWorker in my form which is in charge of generating the PopulationModel for the PopulationView. Once that BackgroundWorker is done, it uses a BeginInvoke to tell the PopulationView it's time to draw.
However, all events behave the way described even before the BackgroundWorker is triggered with RunWorkerAsync. Is it possible it's still interfering?
Editing the PopulationView constructor, I had accidentally deleted the call to InitializeComponent(), where all the Designer code was. Silly, really. If you're ever using the Designer, make sure you call InitializeComponent from your constructor.
I have some user controls. The hierarchy is as follows:
A contains B
B contains C
Inside my C control I have a button. When I click on it want my event
public event EventHandler Print;
to by raised and then I want control A to catch this event. How can I do this?
EDIT 1:
I want to raise my event on User Control C's ViewModel
There are 2 topics that can help you fulfill your need:
Commanding
and
Routed Events
Both mechanisms are built specifically for wpf's hierarchical structure.
Read up on both, they will help your wpf experience immeasurably.
EDIT: Something more helpful. Put Button.Click="" on the control where you want to catch the event. You can use the button's Tag property to store identifying information so your event handler knows that the correct button was clicked.
<Grid Button.Click="Button_ClickHandler">
<Button Tag="PrintButton/>
</Grid>
In your code behind for the user control you will require the handler named Button_ClickHandler.
The above method uses Router Events. I really recommend using Commands however.
You can wrap the event like so:
class B
{
private A a;
public event EventHandler Print
{
add { a.Print += value; }
remove { a.Print -= value; }
}
}
I think you want to look at bubbling events.
Update: I didn't see the wpf tag, you should be looking at routed events
Can anyone tell me how to raise click event of button control (or for that matter for any event).
Platform: .net 2.0/3.0/3.5
Language: c#
Domain: Windows Application, WinForms, etc.
You can use the Button.PerformClick method.
Maybe the solution is much more simple:
Maybe you don't really want your code "to click the button".
Do you just want to run the code which is behind the button from another place in the form?
If yes, put the code into a separate method (like "DoActionXXX") and call the method from the button and from everywhere else where you need it.
You can also look into Windows Accessibility or some UI automation framework that allows you to programmatically cause UI controls to respond to user gestures. If a control does not offer a way for its events to be programmatically triggered like PerformClick, you can derive from that control and expose a public method like PerformnXXX that when called internally invokes the event handlers subscribed to a particular event.
button click and to new my manually window
ex.. dital.cs open the may window
I dont think sending click events is the best way from a design point of you just make your event handler call another function. That way you always have access to that function.
so ..
void myEventHandler(ObjectwhoSentTheMessage O, Event e)
{
MyOtherFunction();
//consume the event after if you wish etc
}
I've create a WinForms control that inherits from System.Windows.Forms.UserControl...I've got some custom events on the control that I would like the consumer of my control to be able to see. I'm unable to actually get my events to show up in the Events tab of the Properties window during design time. This means the only way to assign the events is to programmatically write
myUserControl.MyCustomEvent += new MyUserControl.MyCustomEventHandler(EventHandlerFunction);
this is fine for me I guess but when someone else comes to use my UserControl they are not going to know that these events exist (unless they read the library doco...yeah right). I know the event will show up using Intellisense but it would be great if it could show in the properties window too.
Make sure your events are exposed as public. For example...
[Browsable(true)]
public event EventHandler MyCustomEvent;
A solution using delegate. For example i used for a custom ListView which handle item added event :
Declare your delegate :
public delegate void ItemAddedHandler(object sender, ItemEventArgs e)
then declare the event which use the delegate :
[Browsable(true)]
public event ItemAddedHandler ItemAdded;
Note : ItemEventArgs is a custom EventArgs
Hope can help you, works fine for me