event

helelark123

Hello, I am working with VB.NET 2005. 1) I have class Chart that inherits from PictureBox 2) I have form that contains PictureBox1 The "connection" between them is as following: PictureBox1.Image = Chart.GetBitmap Now I have problems with events. I would like to mousemove on the Picturebox and get some info and this info is is my Chart object How to do? I tried this but I got error message:"End of statement expected" 'Form1 (Main Form) Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles PictureBox1.MouseMove RaiseEvent Chart.Chart_MouseMove() End Sub ----------------------------------------------- 'Class Chart that inherits from PictureBox Public Sub Chart_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) 'Some infos End Sub Phease help

Shay Noy

DaveAuld

[Modified following re reading your post] The first thing to be aware of is your new class Chart can't raise events on the inherited (base class) picturebox If all you are wanting is information returned etc. create a public function in the class chart and call it from inside the mousemove event or wherever on the main form. If you do want to use events relating with your chart class, you will have to create these in your class and then when you declare the class in your form specify the withevents keyword. Then whatever code you are using in the class chart will have to fire these events. Hope that makes sense! Dave

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modified on Sunday, October 25, 2009 2:53 PM

helelark123 · modified on Sunday, October 25, 2009 2:53 PM

if I understood you right, see an example but it doesn't work: Put Picturebox on your form6 (for example) Public Class Form6 Private WithEvents ChartObj As New ChartClass Private Sub Form6_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load AddHandler PictureBox1.MouseMove, AddressOf ChartObj.ChartClass_MouseMove AddHandler PictureBox1.MouseLeave, AddressOf ChartObj.ChartClass_MouseLeave End Sub End Class Public Class ChartClass Inherits PictureBox Public Sub ChartClass_MouseLeave(ByVal sender As Object, ByVal e As System.EventArgs) Cursor = Cursors.Default End Sub Public Sub ChartClass_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Cursor = Cursors.WaitCursor End Sub End Class My question is why the cursor is not changing?

Shay Noy

Christian Graus

I believe you'd need to click on the control for the move events to fire on that control. The enter event may work better ? Have you set breakpoints to see when the events are fired ?

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

helelark123

Clicking on the control for the move events doesn't fire too. The enter event doens't work too I set breakpoints and the events fired. What is wrong?

Shay Noy

Christian Graus

The breakpoint gets hit ? B/c it looks to me like you are saying you have a picturebox, not an instance of your derived class, on your form.

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

DaveAuld

I do not see the relationship between the PictureBox on your form and your class. As Christian States you need to add the chart onto your form as an instance. The code below will show you what i mean; Code For the Form;

Public Class Form1

Private WithEvents myChart As New Chart

Public Sub New()

    ' This call is required by the Windows Form Designer.
    InitializeComponent()

    ' Add any initialization after the InitializeComponent() call.
    Me.Controls.Add(myChart)

    myChart.Top = 50
    myChart.Left = 50
    myChart.BorderStyle = BorderStyle.FixedSingle
    myChart.BackColor = Color.Aqua
    myChart.Width = 300
    myChart.Height = 300

End Sub

Private Sub myChart\_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles myChart.MouseMove
    Debug.WriteLine("The Chart Mouse Is Moving")
End Sub

End Class

Code for your Class;

Public Class Chart
Inherits PictureBox

Private Sub Chart\_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
    Debug.WriteLine("Mouse Is Moving")

End Sub

End Class

Now if you run the code and look at the immediate window, you will see 2 debug messages, 1 showingthe mouse move event firing on the form, and 1 for the mouse move event being handled inside your class. Depending on what you are trying to achieve, you can handle either or both of these events as and where you need them.

Dave Who am I?: Web|Facebook|Twitter|LinkedIn|Bebo

helelark123

Thank you both Dave and Christian. I understood my mistake

Shay Noy