I am trying to make the reversi game in VB.Net. I have some difficulties translating the game`s logic into vb.net
If a button is black and the button next to it is white,than the button next to the white one will be black wen pressed.
newButton.tag = colum of button + (row of button * amount of columns)
-> I made 64 buttons via a function loop and added a tag
Dim knop As Button = sender
Dim value As String = knop.Tag
If value = "...(?)" Then
knop.BackColor = Color.Black
If ....(?)
End If
End If
I already made a scheme with the label of the buttons, but I find it hard to implement the logic. Can someone help me out with thid one?
EDIT: http://i.stack.imgur.com/3gdrJ.png
If you use Dim ButtonList As List(Of List(Of Button)) and add the buttons to the form in runtime you can add each the button for each row to a list then add that list to ButtonList. Now you can access each button by the indexes in the 2 dimensional list.
Since you're changing the backcolor just use that instead of using the tag.
Related
My code creates a 5x5 grid of buttons. I am wanting to give each of these buttons different names "BtnColour1", "BtnColour2", etc. How do I give them all different names and how do I refer to each button later in the program?
Dim bytCounter As Byte
For bytCounter = 1 To 25
Dim btnColour As New Button
Me.Controls.Add(btnColour)
btnColour.Height = 50
btnColour.Width = 50
btnColour.Name = "btnColour" & bytCounter
btnColour.Enabled = False
btnColour.Left = ((bytCounter - 1) Mod 5) * 51
btnColour.Top = ((bytCounter - 1) \ 5) * 51
AddHandler btnColour.Click, AddressOf BtnClick
Your code (I guess you forgot the ending Next) does create 25 Buttons, with names btnColour1... btnColour25.
In the BtnClick event, to get the name of the clicked button, you should write something like:
Private Sub BtnClick(sender As Object, e As EventArgs)
Dim buttonName as string=CType(sender, Button).Name
'buttonName now has the clicked button name
End Sub
Of course, since you set the enabled property to False, your button click event will not fire.
In a general sense (and in addition to Spyros' answer, which is a good way to do it in an event handler - the sender is always the thing that raised the event), when you give a control a name and add it to a control's Controls collection, you can then retrieve it by that name later:
'Here you added the button to the form controls:
Me.Controls.Add(btnColour)
'later in the code you can ask for it back by name, for example:
Dim controls = Me.Controls.Find("btnColour1")
What you get back is an array of Controls. You get an array because Find can search all children (panels inside panels inside groupboxes inside forms etc) and it is thus conceivable that multiple controls in different panels will both have the same name. In your case if you know you only have one control called "btnColour1" it's safe to get it by array index:
Dim control = controls(0) 'controls variable is from the above Find
Lastly, remember that it comes back as a Control, the parent class for all controls. Because you know it's a button, it's safe to cast without check:
Dim button = DirectCast(control, Button)
Remember that if your property is available on the base Control class you don't even need a cast:
'here's a 1 line way to get the text of the button named btnColour1
'Find all controls named btnColour1, take the first, get the text
Dim t = Me.Controls.Find("btnColour1")(0).Text
If you want to refer to the buttons later in the program to change a setting without clicking the button, you can add each button to an array and call each of them with an index number:
Dim buttons(24) As Button
Then as the buttons are created, you can add each button to the array:
Dim bytCounter As Byte
For bytCounter = 1 To 25
Dim btnColour As New Button
Me.Controls.Add(btnColour)
buttons(bytCounter) = btnColour
you can then reference each button and their properties using the index number of the button in the array. You may also want to add a specific tag to each button to make each button more unique using:
btnColour.Tag = bytCounter
I'm using custom buttons to create a virtual keyboard. These buttons use the text of the button as output. However there are keys like Backspace, Space, Tab, etc... That while I want to display a text on them I need to send the corresponding codes like {BACKSPACE}, " ", {TAB} etc...
Someone (Jimi) suggested the use of Dictionary to map the text to the corresponding codes, and I have found examples for comboboxes but I don't really find anything to do it with buttons in vb.net.
Right now my form only has TextBoxes and DataGridViews for user input which gets picked up from button click with:
If TypeOf ActiveControl Is TextBoxBase Then
SendKeys.Send(selectedButton.Text)
ElseIf TypeOf ActiveControl Is DataGridView Then
Dim ctrl = DirectCast(ActiveControl, DataGridView)
If TypeOf ctrl.CurrentCell IsNot DataGridViewTextBoxCell Then Return
SendKeys.Send("{F2}")
SendKeys.Send(selectedButton.Text)here
So I guess my question is how can I change that text with a dictionary when the text of a button gets picked up. I tried:
Dim ButtonSurrogateKeys As New Dictionary(Of String, String)()
ButtonSurrogateKeys.Add("Borrar", "{BACKSPACE}")
Where "Borrar" is the button text and {BACKSPACE} what I want it to change to when clicked.
Thanks in advance.
I am making small restaurant system project. I have 16 buttons as tables in the restaurant. I would like to change their colors or disable any of them when some events trigger (the form is loaded).
I save my button names in format TableX_ButtonY
I used a for-loop to change theirs border colors like this:
CType(Me.Controls.Find(String.Format("Table{0}Button{1}", i, x), True)(0), Button).FlatAppearance.BorderColor = Color.Blue
It will be great if I can save these buttons as a list, so I can manage it more easily.
I name their tags from 1 to 16 but I don't know how to use them correctly. Because the trigger not based on button click but rather based on the Load Form event.
Buttons are already in a collection and is a bit redundant to add them to a generic collection. In this example there are 2 buttons in a group controls collection, which could very well be any applicable container.
Dim ReservedTables() As Integer = {5, 10, 15, 20}
For Each Btn As Button In GroupBox1.Controls.OfType(Of Button)
If ReservedTables.Contains(CType(Btn.Tag, Integer)) Then
Btn.Enabled = False
End If
Next
Dim TableList As New List(Of Button)
TableList.Add(TableX_ButtonY)
For Each Table As Button in TableList
'do stuff
next
if you generated the buttons by using the designer, you can use the method you described in your question to add them all to the list
I have a form with a RichTextBox (RTB) and a listBox.
When the end user selects an item in the listbox, any matched text in the RTB is highlighted (full code removed for brevity).
re = New Regex(txtToFind)
For Each m In re.Matches(rtbMain.Text)
rtbMain.[Select](m.Index, m.Length)
rtbMain.SelectionColor = Color.White
rtbMain.SelectionBackColor = System.Drawing.SystemColors.Highlight
Next
When the user left mouse clicks in the RTB I want the previously highlighted text to be cleared. This is the standard windows behaviour - If you manually select some text in an RTB with the mouse, it is highlighted, click anywhere back in the RTB and the highlighting disappears. My programatically selected text remains selected.
I have some partially working code (below). I can clear all the highlighted text, but it is by process of selecting everything, changing the colour back and then deselecting it again. I know it is not efficient, the RTB flickers and I am sure it is not the correct way to do it. Can I emulate the standard windows behaviour?
Also using my code, it scrolls to the first line when entering the RTB a second time.
I get around this the first time by returning the top visible line index before clearing the text and then selecting that line again afterwards and using ScrollToCaret(). This only works on the first pass. Subsequent MouseDown events select the top row regardless of where the user has clicked so nothing can be manually highlighted in the RTB.
Private Sub rtbMain_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles rtbMain.MouseDown
Dim topIndex As Integer = rtbMain.GetCharIndexFromPosition(New System.Drawing.Point(1, 1))
Dim topLine As Integer = rtbMain.GetLineFromCharIndex(topIndex)
If e.Button = Windows.Forms.MouseButtons.Right Then
'Do nothing (Context Menu)
Else
rtbMain.SelectAll()
rtbMain.SelectionColor = Color.Black
rtbMain.SelectionBackColor = Color.White
rtbMain.DeselectAll()
rtbMain.Select(topIndex, 0)
rtbMain.ScrollToCaret()
End If
End Sub
I need my code to emulate the standard windows behaviour - clear selected text highlighting on MouseDown and leave the mouse cursor where the user has clicked.
Any help anyone can offer is gratefully appreciated.
I think you may be overthinking this one.
In the right click event, try RtbMain.SelectionLength = 0
I want to place a few buttons on my form. The number is unknown at design time. Actually each button will represent an item entered in combo box. So if user adds an item, a button on the form should be added by the code.
Please advise how to do it?
Thanks
Furqan
You can do this by simply looping over any number (in this case from a combo box) and creating the required number of buttons before adding them to the form.
For i As Integer = 0 To myComboBox.Items.Count - 1
Dim newButton = new Button()
// Add some properties, etc. to the button
newButton.Text = myComboBox.Items(i).ToString()
MyForm.Controls.Add(newButton)
Next
You can use a function like this:
Sub AddButton(ByVal label As String, ByVal location As Point)
Dim b As Button
b = New Button
b.Location = location
b.Text = label
Me.Controls.Add(b)
End Sub