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Hot Topic (More than 10 Replies) Drag & Drop - Create Composite Node at cursor (Read 7434 times)
moelski
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Drag & Drop - Create Composite Node at cursor
Jun 28th, 2011 at 3:02am
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Hi !

I use a treeview control which list some node descriptions. The user can select such a node description and move it with drag & drop to the diagramview.

Now Iīd like to create a new composite node on that position where the user unpress the mousebutton.

I have the D&D running until this point:
Code
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        private void diagramview_DragDrop(object sender, DragEventArgs e)
        {
            MessageBox.Show("Mouse : " + MousePosition.X +
                            (sender as DiagramView));
        }


Now I need to know two things:
1) How can I get the mouse position within the diagramview? MousePosition will give me only the screen coordinates.
2) How can I set the initial position if I create a new CompositeNode? All nodes are created at the upper left corner by default.

btw.
Where can I set the diagramView size? Is there no autosize option? I have the DiagramView within a MDI Form and there are always scrollbars.

Greetz
Dominik
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #1 - Jun 28th, 2011 at 3:55am
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Hi !

Ok I figured out two things ...

1) I get the position within the DiagramView with this code:
Code
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 (sender as DiagramView).PointToClient(MousePosition)


2) I Can set the position of a node with the methode Move and use getPixel:
Code
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		this.Move(X * Constants.GetPixel(diagram.MeasureUnit),
			    Y * Constants.GetPixel(diagram.MeasureUnit));

X position seems to be ok. But Y is not ok. The pixelvalue is about 10% wrong  Sad
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #2 - Jun 28th, 2011 at 4:01am
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Hi !

Forget all questions Grin

Setting the diagram.MeasureUnit to Pixel makes my life a lot easier Roll Eyes

Greetz
Dominik
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #3 - Jun 28th, 2011 at 5:01am
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well ... It seems that setting the MeasureUnit to Pixel results in some drawing problems.

The DiagramView wonīt get refreshed if I move a node.  Sad

So maybe you could give me some information how to handle it with the default measureunit. Thx
  
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Stoyo
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Re: Drag & Drop - Create Composite Node at cur
Reply #4 - Jun 28th, 2011 at 6:02am
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You must first convert the drag-and-drop screen coordinates to the view's client rectangle coordinates, and then to diagram units:
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PointF diagramPoint = diagramView.ClientToDoc(diagramView.PointToClient(new Point(e.X, e.Y)));


I hope that helps,
Stoyan
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #5 - Jun 28th, 2011 at 8:59am
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Hi Stoyan,

Quote:
The DiagramView wonīt get refreshed if I move a node.

Do you have an idea why the nodes wonīt get refresh correctly?

If I move a node there are always rests ...
Take a look at the picture.


The only thing I changed was setting the MeasureUnit to Pixel.

Greetz Dominik
  
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Stoyo
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Re: Drag & Drop - Create Composite Node at cur
Reply #6 - Jun 28th, 2011 at 9:39am
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Are you by chance moving nodes from the DragOver handler? You will have to call the view.RecreateCacheImage method in that case.
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #7 - Jun 28th, 2011 at 9:43am
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Hi !

No I only have these two eventhandler for d&d:
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Proj.DiagramView.DragEnter += diagram_DragEnter;
		Proj.DiagramView.DragDrop += diagram_DragDrop;


And the strange thing is ... It works perfect if I switch back to measureUnit = Millimeter
  
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Stoyo
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Re: Drag & Drop - Create Composite Node at cur
Reply #8 - Jun 28th, 2011 at 9:57am
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If you are using custom-drawn node type, you must make sure the node graphics are inside the rectangle returned by GetRepaintRect. If deriving from CompositeNode, the components should be inside Bounds. Repainting might work ok in millimeters if the part outside Bounds/GetRepaintRect is still smaller than AdjustmentHandlesSize and ShadowOffset, but its larger in pixels. By the way you will have to change all size and length -related properties if you change the unit. Their values are not scaled automatically for the new unit.
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #9 - Jun 28th, 2011 at 10:08am
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Hi !

I think they are.
I use the code from your CompositeNode demo and this is my Node:
Root:
Code
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private static readonly string Template = @"<SimplePanel Height=""55"" Width=""80"">
<Border Name=""Selection"" Pen=""LightSteelBlue"" Visible=""False"" />
<Border Name=""Highlight"" Pen=""Red"" Visible=""False"" />
<Border Padding=""1"">
   <Border Name=""Frame"" Background=""#F0F0F0"" Pen=""Black"" />
</Border>
</SimplePanel>";

And the frame content:
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private static readonly string ContentTemplate = @"
                <Border Padding=""1.5,1.5,1.5,1.5"">
                <GridPanel>
                    <GridPanel.Columns>
                            <GridColumn />
                    </GridPanel.Columns>
                    <GridPanel.Rows>
                            <GridRow Height=""4.2""/>
                            <GridRow />
                    </GridPanel.Rows>

                    <Border Name=""HeadBorder"" Background=""#D2D2D2"">
                        <Text Name=""Title"" Text=""Device"" TextAlignment=""Center"" GridRow=""0""/>
                    </Border>

                    <GridPanel GridRow=""1"">
                            <GridPanel.Columns>
                                <GridColumn />
                                <GridColumn />
                            </GridPanel.Columns>
                            <GridPanel.Rows>
                                <GridRow />
                            </GridPanel.Rows>

                            <Image Name=""Picture"" ImageAlign=""Center"" GridColumn=""0"" IsHitTestVisible=""False"">
                                <Image.Image>
                                        <Bitmap>D:\Dev Priv\LogView V3 .net\LogView V3\_Icons\_Found\missing.gif</Bitmap>
                                </Image.Image>
                            </Image>
                            <Text Text=""O"" Font=""Courier New, 12pt, style=Bold"" TextAlignment=""Far"" GridColumn=""1"" />

                    </GridPanel>

                </GridPanel>
</Border>";


So as far as I can see ... All is inside the bounds. Isnīt it?
  
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Stoyo
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Re: Drag & Drop - Create Composite Node at cur
Reply #10 - Jun 28th, 2011 at 12:00pm
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It seems you have set fixed size for the root panel, and components might get repainted outside of the node's bounds and not get refreshed correctly. Setting fixed root dimensions is not advisable unless you know you nodes will have some minimum size. If you skip the Width and Height setters, this should let the content adjust automatically to the size of the node. If Width and/or Height are set, you have to ensure that the size of the node is at least as big as the size of its root component.

I hope that helps,
Stoyan
  
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moelski
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Re: Drag & Drop - Create Composite Node at cur
Reply #11 - Jun 29th, 2011 at 1:51pm
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Hi !

Thx for your help !

Code
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Rectangle test = new Rectangle(x, y, 80, 45);
this.SetBounds(test, false, false);


Setting the bounds in the compositenodes constructor solved my problem.

Now I can set the node where I like in the correct size without any drawing problems.  Smiley

Dominik
  
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