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How can I make text so that I can drag it with the mouse at run time and place it on different parts of a picture box

Posted on 2009-06-29
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Last Modified: 2012-05-07
How can I drag text on to a picture box so that the user can label different parts of the picture without typing vb.net 2008 express
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Question by:Dov_B
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5 Comments
 
LVL 9

Expert Comment

by:Deathrace
ID: 24736975
Hi,
You said text, which control label or textbox you are using. Right now i can suggest one link as per my understanding. Check the below one.
http://www.codeproject.com/KB/cpp/vbnetdragdrop.aspx
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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 24737828
Instead of drawing the text in the Paint() event, we could create actual Label controls and add them to the PictureBox:
Public Class Form1
 
    Public Const HTCAPTION As Integer = &H2
    Public Const WM_NCLBUTTONDOWN As Integer = &HA1
 
    Public Declare Auto Function ReleaseCapture Lib "user32.dll" () As Integer
    Public Declare Ansi Function DragControl Lib "user32.dll" Alias "SendMessageA" (ByVal handle As IntPtr, Optional ByVal Message As Integer = WM_NCLBUTTONDOWN, Optional ByVal HitTest As Integer = HTCAPTION, Optional ByVal wParam As Integer = 0) As Integer
 
    Private startPt As Point
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        NewLabel("Some Thing", New Point(25, 100))
        NewLabel("Another Thing", New Point(150, 100))
        NewLabel("Thing One", New Point(250, 300))
    End Sub
 
    Private Sub NewLabel(ByVal txt As String, ByVal location As Point)
        Dim lbl As New Label
        lbl.Text = txt
        lbl.Location = location
        lbl.BackColor = Color.Transparent
        AddHandler lbl.MouseDown, AddressOf lbl_MouseDown
        AddHandler lbl.MouseMove, AddressOf lbl_MouseMove
        Me.Controls.Add(lbl)
        lbl.Parent = PictureBox1
        lbl.BringToFront()
    End Sub
 
    Private Sub lbl_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        If e.Button = Windows.Forms.MouseButtons.Left Then
            startPt = New Point(e.X, e.Y)
        End If
    End Sub
 
    Private Sub lbl_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        If e.Button = Windows.Forms.MouseButtons.Left Then
            Dim lbl As Label = CType(sender, Label)
            lbl.Location = New Point(lbl.Location.X + (e.X - startPt.X), lbl.Location.Y + (e.Y - startPt.Y))
        End If
    End Sub
 
End Class

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Author Comment

by:Dov_B
ID: 24738127
extremely cool
say before I code the project I dont know how many labels I will need is there a way of dynamicly adding these labels at run time?
also is there a way I can do the same dragging of the labels around the picture box
but drag around smaller pictures I asked this question here
http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_24530191.html#a24737976
someone sent me links but I am having a heck of a time figuring out how to follow those projects is there a way of doing it the same way as the tex
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LVL 86

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 2000 total points
ID: 24738159
"...is there a way of dynamicly adding these labels at run time?"

Yes...I already took that into account.  Just call NewLabel() whenever you want a new label...

"...is there a way I can do the same dragging of the labels around the picture box...but drag around smaller pictures..."

Yes...you can do the exact same thing I did with Labels but with PictureBoxes.  Just create them at run-time as I did and wire up the MouseDown()/MouseMove() events.

Study the NewLabel() method to see what I'm doing in there...   =)
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Author Closing Comment

by:Dov_B
ID: 31597946
woah!!! you did it again !! Thankyou! I have a couple of related questions if you get a chance
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