Invoke_event - lucyberryhub/WPF.Tutorial GitHub Wiki
ππ Invoke Event to Close the Cherry Popup! ππ
Welcome, sweet cherry berry! ππ Letβs have fun today and learn how to close a cute popup using an event called CloseRequested
π. Iβll walk you through everything step by step, so you can make your popup super cute and super functional like Lucy Berry! πΈ
Letβs start the sweet journey! ππ
π Step 1: Set Up Your Cherry Popup Window π
First, letβs prepare your adorable CherryPopup π₯° where everything is going to happen! We need to create an event that will help us close the popup when itβs requested. This event is called CloseRequested! π
Hereβs how you do it in the CherryPopup window class π:
public class CherryPopup
{
// π Event declaration for the CloseRequested event π
public event EventHandler CloseRequested;
// π Method to trigger the CloseRequested event π
public void RequestClose()
{
// π Invoke the event to notify the parent that the popup wants to close! π
CloseRequested?.Invoke(this, EventArgs.Empty);
}
}
π Step 2: Create the CherryParent Class π
Next, we have to listen for this CloseRequested event in the CherryParent class π (the window or control that has the popup). Hereβs how you can do it:
public class CherryParent
{
// π The cherry popup that we are going to close π
private CherryPopup _cherryPopup = new CherryPopup();
// π Subscribe to the CloseRequested event π
public CherryParent()
{
_cherryPopup.CloseRequested += (s, e) =>
{
// π When the CloseRequested event is triggered, we close the popup! π
CloseCherryPopup();
};
}
// π Method to close the popup window π
private void CloseCherryPopup()
{
// π Hereβs where the magic happens! We close the cherry popup! π
_cherryPopup.IsOpen = false; // π Close the popup by setting IsOpen to false π
Console.WriteLine("π Pop, the cherry popup has been closed! π");
}
}
π Step 3: Trigger the Event to Close the Popup π
Now, when you want to close the CherryPopup from anywhere, just call the RequestClose method! π Itβs like sending a close me! message π. Hereβs how you can do it:
public class SomeOtherClass
{
public void DoSomething()
{
// π Trigger the close request! π
_cherryPopup.RequestClose(); // π This will trigger the CloseRequested event! π
}
}
π Step 4: Adding Some Sweetness β Display the Cherry Popup π
We donβt just want to close the popup; letβs make it sweet and pretty! Hereβs how you can visualize and open the popup ππ:
public class CherryPopup
{
public bool IsOpen { get; set; } = true; // π Whether the popup is open or not π
public void Open()
{
// π Display the popup to the user π
Console.WriteLine("π The cherry popup is now open! π");
}
public void Close()
{
// π Close the popup and say goodbye π
IsOpen = false;
Console.WriteLine("π The cherry popup is now closed! π");
}
}
π Step 5: The Sweet Cherry Closing in Action π
Now, when you call RequestClose()
in the CherryPopup, it will notify the CherryParent to close it! π
Hereβs what the whole flow will look like when you run it π:
public class CherryPopupExample
{
public void RunExample()
{
// π Create a new CherryParent and CherryPopup π
var cherryParent = new CherryParent();
var cherryPopup = new CherryPopup();
// π Open the popup and show a sweet message! π
cherryPopup.Open();
// π Now, letβs trigger the close request from somewhere π
cherryPopup.RequestClose(); // π This will close the popup because of the event! π
}
}
π Step 6: Test it Out β It's Cherry Time! π
Finally, letβs test everything together and see the magic happen! When you call RequestClose()
, the event will be triggered and the popup will close. π
π Summary β Sweet, Cute, and Functional! π
Yay! Now you know how to close the cherry popup using the CloseRequested event π. Hereβs the recap of the steps:
- π CherryPopup has the CloseRequested event thatβs triggered when we want to close it.
- π The CherryParent listens for the CloseRequested event and closes the popup.
- π When you want to close the popup, call the RequestClose method to trigger the event.
And there you go! π Your popup is as cute as a cherry π and works just the way you want! π