Enqueue and Dequeue back and forward - vb.net

I made this card game and i chose to loop players turns this way.
Private Sub Players()
c.Enqueue(Player1Name)
c.Enqueue(Player2Name)
c.Enqueue(Player3Name)
c.Enqueue(Player4Name)
End Sub
Private Sub btnNextPlayer_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) btnNextPlayer_Click
c.Dequeue()
End Sub
Private Sub btnPreviousPlayer_CLick(ByVal sender As System.Object, ByVal e As System.EventArgs) btnPreviousPlayer_CLick
c.??????????????????????
End Sub
Now everything works fine over and over when i move to next player with c.Dequeue.
But now let's say i want to go back and forward to the previous and next player within that Players Sub.
Is there any way i could do this WITHOUT messing with the Players sub?

As mentioned in the comments, use a List<> to transverse through the players. See example skeleton model below:
Public Class Player
Public Property Name() As String
Get
Return m_Name
End Get
Set
m_Name = Value
End Set
End Property
Private m_Name As String
Public Shared Widening Operator CType(name As String) As Player
Return New Player() With { _
Key .Name = name _
}
End Operator
End Class
Class Game
Private current As Integer
Private players As List(Of Player)
Public Sub New()
players = New List(Of Player)()
players.Add("Player 1")
players.Add("Player 2")
players.Add("Player 3")
players.Add("Player 4")
current = -1
End Sub
Public Function GetCurrentPlayer() As Player
Return If(current >= 0 AndAlso current < players.Count, players(current), String.Empty)
End Function
Public Sub BeginGame()
current = 0
End Sub
Public Sub NextPlayer()
' select next, or wrap around after last player
current = (current + 1) Mod players.Count
End Sub
Public Sub PreviousPlayer()
' select previous, or go to end before fist player
current = (current + players.Count - 1) Mod players.Count
End Sub
Private Shared Sub Main(args As String())
Dim game As New Game()
game.BeginGame()
' Player 1
Debug.Print(game.GetCurrentPlayer().Name)
game.NextPlayer()
game.NextPlayer()
game.NextPlayer()
' Player 4
Debug.Print(game.GetCurrentPlayer().Name)
game.PreviousPlayer()
' Player 3
Debug.Print(game.GetCurrentPlayer().Name)
game.NextPlayer()
game.NextPlayer()
' Player 1
Debug.Print(game.GetCurrentPlayer().Name)
End Sub
End Class

Try having two Queue(Of Player) objects
Private Sub btnNextPlayer_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) btnNextPlayer_Click
d.Enqueue(c.Dequeue())
End Sub
Private Sub btnPreviousPlayer_CLick(ByVal sender As System.Object, ByVal e As System.EventArgs) btnPreviousPlayer_CLick
c.Enqueue(d.Dequeue())
End Sub

Related

How change Compare Multiple Textbox

I have 2 codes to change the color to Textbox, and unfortunately none of them work. What's wrong here? Why the code is not good. Every time I try the code, not worked, The first code changes the color to Textbox if there is a value between 1 and 7, and the second changes the value in ascending order from the lowest to the highest and assigns a corresponding color. Please tell me if these 2 codes are written correctly, or there is a write error.
Code 1: Image: http://www.imagebam.com/image/5ac5ee1073004874
Public Class TextBoxColors
Private ColorTable As Dictionary(Of String, Color) = New Dictionary(Of String, Color)()
Public Sub New()
ColorTable.Add("1", Color.Red)
ColorTable.Add("2", Color.Aqua)
ColorTable.Add("3", Color.Chocolate)
ColorTable.Add("4", Color.BlanchedAlmond)
ColorTable.Add("5", Color.BurlyWood)
ColorTable.Add("6", Color.BlueViolet)
ColorTable.Add("7", Color.DarkBlue)
End Sub
Public Function GetColor(ColorMap As String) As Color
Return If(ColorTable.Keys.Contains(ColorMap), ColorTable(ColorMap), Color.White)
End Function
End Class
Private txtColor As TextBoxColors = New TextBoxColors()
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
For Each txtDraw As TextBox In Me.Controls.OfType(Of TextBox).Where(Function(txt) txt.Name.StartsWith("txtDraw"))
AddHandler txtDraw.TextChanged,
Sub()
If Not String.IsNullOrEmpty(txtDraw.Text) Then
txtDraw.BackColor = txtColor.GetColor(txtDraw.Text)
End If
End Sub
Next
End Sub
Code 2: This 2nd code must be changed based on my text box, which starts with SumtxtDraw
- Image: http://www.imagebam.com/image/92a4091073004904
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
FillColorList()
End Sub
Private Sub ColorTextBoxes()
FillTextBoxList(16, 23)
Dim SortedList As List(Of TextBox) = SortList()
Dim index As Integer
For Each txt As TextBox In SortedList
txt.BackColor = lstColor(index)
index += 1
Next
End Sub
Private Sub FillColorList()
lstColor.Add(Color.Red) 'for lowest number
lstColor.Add(Color.BlanchedAlmond)
lstColor.Add(Color.PaleGreen)
lstColor.Add(Color.Chartreuse)
lstColor.Add(Color.CadetBlue)
lstColor.Add(Color.Orange)
lstColor.Add(Color.DarkMagenta)
lstColor.Add(Color.Violet) 'for highest number
End Sub
Private Sub FillTextBoxList(StartNumber As Integer, EndNumber As Integer)
lstTextBox.Clear()
For suffix = StartNumber To EndNumber
lstTextBox.Add(DirectCast(Controls("TextBox" & suffix.ToString), TextBox))
Next
End Sub
Private Function SortList() As List(Of TextBox)
Dim orderedList = From txt In lstTextBox Order By CInt(txt.Text) Descending Select txt '$"{scorer.Score} - {scorer.Name}"
Dim SortedList As List(Of TextBox) = orderedList.ToList
Return SortedList
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ColorTextBoxes()
End Sub

ListChanged Event not firing?

I have a class with a bindinglist(of T) in it. The bindinglist is bound to a datagridview on my form. When items are added to the bindinglist, they show up in the datagridview however the scrollbar never changes to accommodate for the new data. I am starting to think this is because the Listchanged event isn't being fired (or properly captured by my form). I have my code set up like this:
Data Class:
Public Class data
Implements INotifyPropertyChanged
Public Sub new(byVal att1 as string, ByVal att2 as string)
Attribute1 = att1
Attribute2 = att2
End sub
Private mAttribute1 as string
Public Property Attribute1 as string
Get
return mAttribute1
End get
Set(ByVal value as string)
mAttribute1 = value
OnPropertyChanged("Attribute1")
End Set
End Property
Private mAttribute2 as string
Public Property Attribute2 as string
Get
return mAttribute2
End Get
Set(ByVal value as string)
mAttribute2 = value
OnPropertyChanged("Attribute2")
End Set
End Property
Public Sub OnPropertyChanged(ByVal name As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))
End Sub
Public Sub ChangeDataFormat()
'change from one format to the other
End Sub
End Class
Data Generator Class:
Public Class dataGenerator()
private myThread as New System.Theading.Thread(address of StartDataGeneration)
Public Sub new()
mDataList = new bindingList(of Data)
mDataList.RaiseListChangedEvents = True
Private WithEvents mDataList as bindingList(Of Data)
Public readonly DataList as bindingList(of Data)
Get
Return mDataList
End Get
End property
Private Sub StartDataGeneration()
dim att1 as integer = 1
dim att2 as integer = 2
for i as Integer = 0 to 1000
mDataList.Insert(0,New Data(att1.ToString,att2.ToString)
att1 *= 2
att2 *=3
next
End Sub
Public Sub StartDataThread()
myThread.Start()
End Sub
Public Sub ChangeDataFormat()
for each d as data in mDataList
d.ChangeDataFormat()
next
End Sub
End Class
Form:
Public class Form1
Private myGenerators as new BindingList(of dataGenerator)
Private myDataGrids as new BindingList(of DataGridView)
Private Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Mybase.Load
dim NumberOfGenerators as integer = Convert.ToInt32(My.Settings.CraneCount)
for i as integer = 1 to NumberOfGenerators
Dim newGenerator As New DataGenerator()
Dim newTab as Ne tabPage(i.ToString)
Dim NewGrid as New DataGridView
newTab.Controls.Add(newGrid)
newGrid.DataSource = newGenerator.DataList
myGenerators.Add(newGrid)
next
End Sub
Private Sub ButtonStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonStart.Click
for each generator as dataGenerator in myGenerators
generator.StartDataThread()
next
End Sub
Private Sub ButtonChangeFormat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonChangeFormat.Click
for each generator as dataGenerator in myGenerators
generator.ChangeDataFormat()
next
End Sub
End Class
I know that there is a lot of code but I wanted to be clear. So when I click the start button the new items start appearing, however, once they get to the bottom of the grid the scroll bar doesn't appear. If I click the Change Format button the data changes format and updates in the grid properly. I was under the impression that the ListChanged event would automatically work with a bindinglist and datagridview. I tried calling update and refresh on myDataGridView and setting datagridview.datasource to nothing and then back to DataList.
Am I missing something?

Validating a checkListBox?

I have two forms (1 and 2). I have been battling with some code that would prevent the user from selecting an item in the checkedListBox that was not added into ListBox2 from the previous form (form1).
The code I have is kind of weird because even if the item was added to listbox2 from form1, it continues to display the msgBox. I need the msgBox to display only to those items that were not added to listbox2, form1.
Here is what I have:
Public Class Form1
Dim ActSubject As Boolean
Public Function ActivateSubject() As String
Return ActSubject
End Function
Private Sub ListBox2_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox2.TextChanged
Dim x As New Items
x.AvailableItems = ListBox2.Items.ToString
For Each x In ListBox2.Items
If ListBox2.Items.Contains(x) Then
ActSubject = True
Else
ActSubject = False
End If
Next
End Sub
End Class
Public Class Form2
Dim HaveActSubject As Boolean = Form1.ActivateSubject
Private Sub CheckedListBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckedListBox1.SelectedValueChanged
If HaveActSubject = False Then
MsgBox("Sorry! Subject should be activated six month before registration.")
End If
Return
End Sub
End Class
Public Class Form1
Public Function ActivateSubject(itm as string) As String
Return ListBox2.Items.Contains(itm)
End Function
End Class
Public Class Form2
Dim HaveActSubject As Boolean = Form1.ActivateSubject
Private Sub CheckedListBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckedListBox1.SelectedValueChanged
If Form1.ActivateSubject(CheckedListBox1.selectedValue) = False Then
MsgBox("Sorry! Subject should be activated six month before registration.")
End If
Return
End Sub
End Class

VB .Net listboxes and collections of objects

I would like to move Item objects between the 2 following collections.
Private ItemsInRoom As New List(Of CItem)
Private Inv As New List(Of CItem)
I would like this to be done through 2 ListBoxes. 1 is the Inventory and the other is the Item list. How can I do this.
The CItem class has several members, only the Name of the item needs to be shown in the ListBox. I have been at this for hours, but I can't get anything to work. Does this explanation make sense in what I'm trying to do? If not, what else can I explain so someone might help me?
In your CItem class you need to override the ToString() function. That will get the name displayed in the listbox.
Public Class CItem
Public Overrides Function ToString() As String
Return Me.Name
End Function
'etc...
End Class
I think what you want is this:
Which is accomplished with the following code:
Option Explicit On
Public Class Form1
Private ItemsInRoom As New List(Of CItem)
Private ItemsInInv As New List(Of CItem)
Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
MyBase.OnLoad(e)
ItemsInInv.Add(New CItem(1001, "Egret"))
ItemsInInv.Add(New CItem(1002, "Dove"))
ItemsInInv.Add(New CItem(1003, "Hawk"))
UpdateBindings()
End Sub
Public Function CheckOut(ByVal item As CItem) As Boolean
If item IsNot Nothing Then
ItemsInInv.Remove(item)
ItemsInRoom.Add(item)
Return True
End If
Return False
End Function
Public Function CheckIn(ByVal item As CItem) As Boolean
If item IsNot Nothing Then
ItemsInRoom.Remove(item)
ItemsInInv.Add(item)
Return True
End If
Return False
End Function
Public Sub UpdateBindings()
itemsInInvListBox.BeginUpdate()
itemsInInvListBox.DataSource = Nothing
itemsInInvListBox.DataSource = ItemsInInv
itemsInInvListBox.DisplayMember = "Name"
itemsInInvListBox.EndUpdate()
itemsInInvListBox.Refresh()
itemsInRoomListBox.BeginUpdate()
itemsInRoomListBox.DataSource = Nothing
itemsInRoomListBox.DataSource = ItemsInRoom
itemsInRoomListBox.DisplayMember = "Name"
itemsInRoomListBox.EndUpdate()
itemsInRoomListBox.Refresh()
End Sub
Private Sub itemsInInvListBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles itemsInInvListBox.SelectedIndexChanged
checkOutButton.Enabled = itemsInInvListBox.SelectedIndex <> -1
End Sub
Private Sub itemsInRoomListBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles itemsInRoomListBox.SelectedIndexChanged
checkInButton.Enabled = itemsInRoomListBox.SelectedIndex <> -1
End Sub
Private Sub checkOutButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles checkOutButton.Click
Dim item As CItem = CType(itemsInInvListBox.SelectedItem, CItem)
If CheckOut(item) Then
UpdateBindings()
End If
End Sub
Private Sub checkInButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles checkInButton.Click
Dim item As CItem = CType(itemsInRoomListBox.SelectedItem, CItem)
If CheckIn(item) Then
UpdateBindings()
End If
End Sub
End Class
Public Class CItem
Public Sub New(ByVal item_id As UInteger, ByVal item_name As String)
Me.m_id = item_id
Me.m_name = item_name
End Sub
Private m_name As String
Public Property Name() As String
Get
Return m_name
End Get
Set(ByVal value As String)
m_name = value
End Set
End Property
Private ReadOnly m_id As UInteger
Public ReadOnly Property ID() As UInteger
Get
Return m_id
End Get
End Property
End Class

String Manipulation by hiding and showing

The idea is simple, if I have a string value "ABCD" then with a ButtonClick event it should randomly reveal a char while others are hidden. i.e, "B*" another click would "AB**" and so on.
So far, my I have been stuck in a for loop.
For Each c As Char In x
y = Random.Next(0, x.IndexOf(c))
Next
I'm still learning VB.NET at this phase.
Public Class Form1
Private _indexes As Integer()
Private _currentIndex As Integer
Private _chars As Char()
Private _template As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim rnd = New Random()
_template = "ABCD"
' Create indexes that are randomly sorted
_indexes = Enumerable _
.Range(0, _template.Length) _
.OrderBy(Function(i) rnd.Next()) _
.ToArray()
'Create an array of chars with stars '****'.
_chars = New String("*"c, _template.Length).ToCharArray()
_currentIndex = 0
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If _currentIndex < _template.Length Then
Dim index As Integer = _indexes(_currentIndex)
_currentIndex += 1
_chars(index) = _template(index)
Dim result As String = New String(_chars)
Label1.Text = result
End If
End Sub
End Class
I have already posted an answer where I focused on the algorithm. The algorithm code was directly integrated into a form. This works but is not a good practice. The code would be more reusable, more understandable and could be tested more easily if it was extracted to a separate class.
Public Class RandomTextRevealer
Private _indexes As Integer()
Private _currentIndex As Integer
Private _chars As Char()
Private _template As String
Private _result As String
Public Sub New(ByVal templateText As String)
Dim rnd = New Random()
_template = templateText
' Create indexes that are randomly sorted
_indexes = Enumerable _
.Range(0, _template.Length) _
.OrderBy(Function(i) rnd.Next()) _
.ToArray()
'Create an array of chars with stars '****'.
_chars = HiddenText.ToCharArray()
_currentIndex = 0
End Sub
Public Function RevealNext() As String
If _currentIndex < _template.Length Then
Dim index As Integer = _indexes(_currentIndex)
_currentIndex += 1
_chars(index) = _template(index)
_result = New String(_chars)
End If
Return _result
End Function
Public ReadOnly Property HiddenText() As String
Get
Return New String("*"c, _template.Length)
End Get
End Property
End Class
We can test the class like this in a little console application, without a form:
Module Programm
Public Sub Main()
Dim revealer = New RandomTextRevealer("Just a test")
Console.WriteLine(revealer.HiddenText)
For i As Integer = 1 To 12
Console.WriteLine(revealer.RevealNext())
Next
Console.ReadKey()
End Sub
End Module
Now we can integrate it in a form like this (I added a Reset-button, in order to be able to repeat the test with different random values):
Public Class Form2
Dim revealer As RandomTextRevealer
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Reset()
End Sub
Private Sub btnReveal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReveal.Click
Label1.Text = revealer.RevealNext()
End Sub
Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
Reset()
End Sub
Private Sub Reset()
revealer = New RandomTextRevealer("ABCD")
Label1.Text = revealer.HiddenText
End Sub
End Class
Now our form-code looks much cleaner.