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Hot Topic (More than 10 Replies) custom nodes (Read 9711 times)
Stoyo
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Re: custom nodes
Reply #15 - Oct 24th, 2013 at 2:43pm
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It seems that happens because you attach the dragged node to the nearby parent container while still moving the child. Then the Bounds assignment in resizeNode leads to calling the child's Start, Update and Complete -Modify methods (called in order to update attached nodes) leading to resetting some interaction fields while child's current UpdateModify still runs.

You should delay calling AttachTo method until interaction ends, i.e. call it from CompleteModify override. Or otherwise avoid setting the Bounds property in resizeNode, but call the SetBounds method with updateGroups argument set to false, to prevent the extraneous update of attached children including currently moved one.

I hope that helps,
Stoyan
  
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Vincent
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Re: custom nodes
Reply #16 - Oct 24th, 2013 at 3:17pm
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Ah it works. I changed the resize method to

Code
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public void resizeNode(double widthToAdd, double heightToAdd)
        {
            //this.MinimumSize = new Size(Bounds.Width * 2, Bounds.Height);
            if (lastInflatedNode != this)
            {
                if (lastInflatedNode != null)
                    lastInflatedNode.Bounds = lastBounds;

                Rect r = this.Bounds;
                lastBounds = r;
                Rect newBounds = new Rect(Bounds.X, Bounds.Y, Bounds.Width + widthToAdd, Bounds.Height + heightToAdd);
                this.SetBounds(newBounds, false, true);
                lastInflatedNode = this;
                Debug.WriteLine("New Bounds: " + Bounds);
            }
        }


But now something else happens. When I move an operator node to the right slot of another operator node, the dragged operator flickers. It moves to another spot and then back to where the mousecursor is and then back to that spot etc. Do you have an idea of what could be causing this?

Thanks in advance!

Vincent
  
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Stoyo
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Re: custom nodes
Reply #17 - Oct 25th, 2013 at 7:34am
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If you add some Debug.WriteLines in BROperator.AlignNodeToMe:

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// Calculate the distance of the two points
double dx = targetPoint.X - pointToSnap.X;
double dy = targetPoint.Y - pointToSnap.Y;

// Move the dragged node to position
var childBounds = toAdd.Bounds;
Debug.WriteLine("1: " + childBounds);
childBounds.Offset(dx, dy);
toAdd.SetBounds(childBounds, true, true);
Debug.WriteLine("2: " + childBounds);
AssignNodeToSlot(toAdd, targetPoint);


they show that you align childBounds to a different position for the same initial rect:

1: 247.5,232.5,50,20
2: 231.5,192.5,50,20

1: 247.5,232.5,50,20
2: 263.5,262.5,50,20

1: 247.5,232.5,50,20
2: 231.5,192.5,50,20

1: 247.5,232.5,50,20
2: 263.5,262.5,50,20

The first Rect shows where the control wants to place the node due to standard move handling, the second one is where you want it aligned.

So check all variables and fields you are using when calculating dx and dy, you might have to update some of them after each alignment.

I hope that helps,
Stoyan
  
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Vincent
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Re: custom nodes
Reply #18 - Oct 25th, 2013 at 12:13pm
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Ahh, I got it.

I changed the point of the child node to calculate the closest connectionpoint with in AlignNodeToMe() from:
Code
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Point pointToSnap = toAdd.connectionPoint;

to:
Code
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var childBounds = toAdd.Bounds;

double pX = childBounds.X + 25;
double pY = childBounds.Y;
Point pointToSnap = new Point(pX, pY);


But the way it's calculated is exactly the same. I only do it in the method Draw(). Perhaps it isn't updated when Draw() is called. In any case, it works.

Thanks Stoyan!

Vincent
  
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Stoyo
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Re: custom nodes
Reply #19 - Oct 25th, 2013 at 1:17pm
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Perhaps the problem is that Draw is not called between two UpdateModify calls due to WPF's asynchronous layout and drawing model, so you shouldn't rely on values cached in Draw. Also I suspect WPF repeats the last system drag-and-drop event when you move an UIElement under the mouse pointer, it looks as if you get these events in pairs because of the SetBounds calls.

I hope that helps,
Stoyan
  
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