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Hot Topic (More than 10 Replies) Inherit MainForm (Read 3350 times)
kpdamico@aol.com
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Inherit MainForm
Jun 2nd, 2008 at 3:01pm
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I am using the latest version of Flowchart.Net and am attempting to inherit the main form onto a form I call decomp.  It is working okay when dropping nodes and links on it.  However, when I attempt to access a node or link to change text it won't update the display. 

After inheriting the Flowcharter MainForm do I have to add anything to the inherited form declaration section?

Thanks
Ken Roll Eyes
  
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Stoyo
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Re: Inherit MainForm
Reply #1 - Jun 2nd, 2008 at 5:46pm
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Hi Ken,

I've added Form1 inherited from MainForm, and changed the Main method implementation from

Application.Run(new MainForm());

to

Application.Run(new Form1());

Now after dropping item on the form, I can set its text from the property grid and it repaints ok. Does that work in your project?

Stoyan
  
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kpdamico@aol.com
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Re: Inherit MainForm
Reply #2 - Jun 2nd, 2008 at 7:38pm
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Stoyan,

I can update the text on the inherited form from the property box, but I cannot access the node programmatically.  I even tried using Form_decomposition._doc.Items - a partial snippet appears below:

For Each item As DiagramItem In Form_decomposition._doc.Items
         

           If TypeOf item Is ShapeNode Then
               Dim shape As ShapeNode = item
               Debug.Print("found shape " & (shape.Shape.Id))

               'if task or And Gate or Or Gate or Xor Gate then
               If ((shape.Shape.Id = "Task") Or (shape.Shape.Id = "Delay") Or (shape.Shape.Id = "Or2") Or (shape.Shape.Id = "Xor")) Then
                   If (shape.ZIndex = Isel) Then
                       Debug.Print("found task node that was double clicked")

This code never finds the task node.

It's funny because I can add nodes, links, single click and double click (and everything seems to work just like the main form but I can't access the nodes or links)    PLEASE HELP
  
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Re: Inherit MainForm
Reply #3 - Jun 3rd, 2008 at 8:04am
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Are you sure Form_decomposition refers to the form instance visible on the screen? What code are you using to open the inherited form?
  
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Re: Inherit MainForm
Reply #4 - Jun 3rd, 2008 at 1:42pm
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The following snippet from my program launches the decomp window

'launch new window
          Dim formT As New Form_decomposition

                       formT.Visible = True
                       formT.SetDesktopLocation(200, 50)
                       formT.BringToFront()
                       formT.Activate()

This code works fine.  It launches the inherited form and allows me to add nodes and links and move them around, and update text thru the property window.  I just can't see them via the program.
  
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Re: Inherit MainForm
Reply #5 - Jun 3rd, 2008 at 1:47pm
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Is there a new node shown if you call formT._doc.Factory.CreateShapeNode(10, 10, 100, 100) after formT.Activate() ?
  
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Re: Inherit MainForm
Reply #6 - Jun 3rd, 2008 at 2:31pm
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Stoyo,

That worked - displayed a big node.

Ken
  
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Re: Inherit MainForm
Reply #7 - Jun 3rd, 2008 at 2:43pm
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So if you now assign formT._doc.Nodes[0] to a ShapeNode variable and set its Text, isn't it displayed correctly?
  
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Re: Inherit MainForm
Reply #8 - Jun 3rd, 2008 at 6:23pm
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Stoyo,

Could you please provide a little VB snippet for that?

Thanks
Ken Smiley
  
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Re: Inherit MainForm
Reply #9 - Jun 3rd, 2008 at 6:37pm
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formT._doc.Factory.CreateShapeNode(10, 10, 100, 100)
dim node as ShapeNode = formT._doc.Nodes(0)
node.Text = "Start"

Does that display some text? If it works, perhaps Form_decomposition does not refer to the same form as formT. I remember something about VB creating a default form instance named as the class, so perhaps the default instance is hidden, and its Diagram member _doc stays empty all the time. While formT refers to the visible instance of the form class and its _doc lets you access the items shown on the screen?

Stoyan
  
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Re: Inherit MainForm
Reply #10 - Jun 5th, 2008 at 4:33pm
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Stoyo,

I think your right.  I just looked at the number of items in Form_decomposition._doc.Items and they are zeroe.  All of the nodes are within the MainForms set MainForm._doc.Items.  The major problem for me is I was hoping to use z index to uniquely identify nodes.  I can't do that now as I have 2 nodes with the same z index.  Is there another way of uniquely addressing these nodes?

Thanks
Ken
  
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Re: Inherit MainForm
Reply #11 - Jun 6th, 2008 at 7:15am
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Hi Ken,

You might assign some identifier to the node's Tag. It could be the result of Guid.NewGuid(), or the name of the form + node.ZIdex.ToString(). Later you can call Diagram.FindNode() to find a node by its tag.

I hope that helps,
Stoyan
  
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kpdamico@aol.com
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Re: Inherit MainForm
Reply #12 - Jun 6th, 2008 at 12:22pm
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Stoyan,

I was wondering about the Tag.  I think I will give your idea a spin.  Thanks for the help.

Ken Smiley
  
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