Creating a Basic Undo Manager for Integer Values

Creating a Basic Undo Manager for Integer Values

By : cuu
Date : November 22 2020, 10:48 AM
wish help you to fix your issue add action to the stack and remove it for "undo". example of command pattern: https://berther.io/2004/09/16/using-the-command-pattern-for-undo-functionality
code :

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ios Undo manager - reset to first undo

ios Undo manager - reset to first undo

By : Alexandr Savichev
Date : March 29 2020, 07:55 AM
around this issue Depending on what you're doing, the implementation might be different, but the documentation for NSUndoManager can be found here.
If you just want to undo the last group of actions, call undoNestedGroup.
Creating a simple Game score manager in Visual Basic?

Creating a simple Game score manager in Visual Basic?

By : Thomas-Louis Lafores
Date : March 29 2020, 07:55 AM
I wish this help you You can use simple XMlserialize for storing score values outside of application .Every time when you open application you can read you object and every time when you exit you can store your objects .Read more : http://support.microsoft.com/kb/316730 Your simple serializable class will be such :
code :
Class UsersList

        Public Property members As List(Of User)
        Sub New()
            members = New List(Of User)
        End Sub

        Public Sub add(user As User)
            If IsNothing(members) = False Then
            End If

        End Sub
    End Class
    Class User
        Public scores As List(Of Single)
        Public Property name As String
        Sub New()
            scores = New List(Of Single)
        End Sub

        Public Sub add(score As Single)
            If IsNothing(scores) = False Then
            End If

        End Sub

    End Class

And For user input you can do two ways :

        'Displaying warning when it is not valid float number
    'works for floating numbers too
            Private Sub TextBox_TextChanged(sender As System.Object, e As System.EventArgs) Handles YouTextbox1.TextChanged,YourTextbox2.TextChanged
                Dim cheked As TextBox = CType(sender, TextBox)
                If IsNothing(cheked) = False Then
                    Dim f As Single
                    If Single.TryParse(cheked.Text, f) = False Then
                        MessageBox.Show("Warning .Please enter valid number")

                    End If

                End If
            End Sub
        'not allow user enter to type wrong keys
         Private Sub TextBox1_KeyPress(sender As System.Object, e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox.KeyPress
              'Disallow user type anything besides numbers 
                If e.KeyChar < CChar("0") Or e.KeyChar > CChar("9") Then
                    e.Handled = True
                End If
            End Sub
C# Creating a basic event manager using Action, passing optional params to Invoke

C# Creating a basic event manager using Action, passing optional params to Invoke

By : Sam Gurney
Date : March 29 2020, 07:55 AM
this will help As you surely have noticed the delegate type Action has no parameters. Keep that in mind.
code :
Event_Manager.trigger("player_hit", new PlayerHitEventArgs(15));
public void player_damaged(dynamic data){
    var damage = data.damage;
    // Reduce health

Event_Manager.on("player_hit", player_damaged);

Event_Manager.trigger("player_hit", new {damage = 15});
MethodInfo methodInfo = item.Method;
object target = item.Target;
var paramList = method.GetParameters();
var args = new object[paramList.Length];
public static void trigger(string evt, object obj){
    Delegate item;

    if(event_list.TryGetValue(evt, out item)){
        // Get MethodInfo and Target
        MethodInfo methodInfo = item.Method;
        object target = item.Target; 
        // Get the parameter list
        var paramList = methodInfo.GetParameters();
        // Get the type of the obj
        var type = obj.GetType();
        // Build the argument list
        var args = new object[paramList.Length];
        for (int index = 0; index < paramList.Length; index++)
            var parameter = paramList[index];
            var name = parameter.Name;
            // Get the value from obj
            var property = type.GetProperty(name);
            var value = property.GetValue(obj, null);
            args[index] = value;
        // Invoke
        methodInfo.Invoke(target, args);
public void player_damaged(int damage){
    // Reduce health

Event_Manager.on("player_hit", new Action<int>(player_damaged));

Event_Manager.trigger("player_hit", new {damage = 15});
How can I undo a NSManagedObject deletion without using the built-in undo manager?

How can I undo a NSManagedObject deletion without using the built-in undo manager?

By : Maybays
Date : March 29 2020, 07:55 AM
may help you . I'm building an OSX document-based app using CoreData and NSUndoManager. , Got it figured out. The easy answer:
code :
func removeAnObject(object: NSManagedObject) {

    let property1 = object.property1
    let property2 = object.property2

    self.project?.undoManager?.registerUndoWithTarget(self, handler: { (object) in

        object.property1 = property1
        object.property2 = property2

I am having issues with a basic contact manager that I am creating.

I am having issues with a basic contact manager that I am creating.

By : Tuguldur Bayarnyam
Date : March 29 2020, 07:55 AM
help you fix your problem The problem is that you are using x as the index of the array, but x is never being incremented.
As you are incrementing counter
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