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Waterfiets
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Reset Node Height
Nov 8th, 2013 at 3:26pm
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Hi there,

At the moment i have a node which adjusts its size according to the size of the node that has been dragged into it, but it doesn't change back to the original size once i remove the node.

Do you happen to have an easy fix for this and if so could you give me an example?

Here is my code for the resizing.

Code
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  public void assignNodeToPart(BRNode child_shape, Point coord_then, Point coord_else, Point coord_bottom, Point snapPoint)
        {
            double height_to_add = child_shape.Bounds.Height - padding;
            if (snapPoint.Equals(coord_then))
            {
                this.Try_Connected_Node = child_shape;
                if (TryHeight > height_to_add)
                    height_to_add = 0;
                resizeHeight(height_to_add);
                //child_shape.AttachTo(this, AttachToNode.MiddleRight);
            }
            else if (snapPoint.Equals(coord_else))
            {
                this.Catch_Connected_Node = child_shape;
                if (CatchHeight > height_to_add)
                    height_to_add = 0;
                resizeHeight(height_to_add);
                //child_shape.AttachTo(this, AttachToNode.MiddleRight);
            }
            else
            {
                this.connected_node = child_shape;
                child_shape.AttachTo(this, AttachToNode.BottomLeft);
            }
        }

        public void resizeHeight(double height_to_add)
        {
            // Change the bounds of the node according to the size of the child node
            if (lastInflatedNode != this)
            {
                if (lastInflatedNode != null)
                    lastInflatedNode.Bounds = lastBounds;

                Rect r = this.Bounds;
                lastBounds = r;
                Rect newBounds = new Rect(r.X, r.Y, r.Width, r.Height + height_to_add);
                this.SetBounds(newBounds, false, true);
                lastInflatedNode = this;
            }
        }


Thanks in advance.

Greets,

Sander
  
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Stoyo
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Re: Reset Node Height
Reply #1 - Nov 11th, 2013 at 8:50am
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Hi,

You should be able to calculate the correct height of parent nodes at any time, depending on whether child nodes are assigned to their slots:

Code
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var newHeight = 3 * padding +
    try_node != null ? try_node.Bounds.Height : padding +
    catch_node != null ? catch_node.Bounds.Height : padding;


That's assuming you use the E-like shape from previous posts, and padding value designates both thickness of the shape's arms and default spacing between arms when slots are empty.

I hope that helps,
Stoyan
  
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Waterfiets
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Re: Reset Node Height
Reply #2 - Nov 11th, 2013 at 9:11am
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Hi there,

We've tried out your solution, but it doesn't seem to work. This is probably caused because the try or catchnode property is not set to null when the node is removed. How can i detect when the node is removed?

Thanks in advance.

Greets,

Sander

Code
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        public void resizeHeight(double height_to_add)
        {
            // Change the bounds of the node according to the size of the child node
            if (lastInflatedNode != this)
            {
                if (lastInflatedNode != null)
                    lastInflatedNode.Bounds = lastBounds;

                double tryHeight = Try_Connected_Node != null ? Try_Connected_Node.Bounds.Height : padding;
                double catchHeight = Catch_Connected_Node != null ? Catch_Connected_Node.Bounds.Height : padding;

                var newHeight = 3 * padding + tryHeight + catchHeight;

                Rect r = this.Bounds;
                lastBounds = r;
                Rect newBounds = new Rect(r.X, r.Y, r.Width, newHeight);
                this.SetBounds(newBounds, false, true);
                lastInflatedNode = this;
            }
        }
  
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Stoyo
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Re: Reset Node Height
Reply #3 - Nov 11th, 2013 at 11:31am
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I suppose you should reset it to null from NodeModified handler, when you detect e.Node is a child node and has been moved away from its parent. Or if using custom nodes, you could reset it from an override of the CompleteModify method.

I hope that helps,
Stoyan
  
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Waterfiets
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Re: Reset Node Height
Reply #4 - Nov 11th, 2013 at 12:23pm
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Could you give an example of the last example?

Thanks in advace.

Greets,

Sander
« Last Edit: Nov 11th, 2013 at 1:29pm by Waterfiets »  
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Stoyo
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Re: Reset Node Height
Reply #5 - Nov 11th, 2013 at 5:26pm
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If you use the AttachTo method to attach child nodes to parent node, it's actually easier to override OnChildModified in the parent node class:

Code
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// e.g. in If_Shape
protected override void OnChildModified(DiagramNode node, AdjustmentHandles handle)
{
	base.OnChildModified(node, handle);

	if ((node.GetCenter() - this.GetCenter()).Length > 50)
	{
		node.Detach();
		if (node == Then_connected_node)
			Then_connected_node = null;
		resizeHeight(...);
	}
}


otherwise you will have to make the resizeHeight method public and call it from child's CompleteModify or NodeModified:

Code
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// e.g. in BR_Shape
protected override void CompleteModify(Point end, InteractionState ist)
{
    base.CompleteModify(end, ist);
    AlignToNearestPoint(end, ist);
    lastInflatedNode = null;

	if (parent_node != null)
	{
		if ((parent_node.GetCenter() - this.GetCenter()).Length > 50)
		{
			// call some function to disassociate parent with child and call parent.resizeHeight
		}
		else
		{
			// return node to its slot if user hasn't moved it far enough?
		}
	}
}


I hope that helps,
Stoyan
  
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Waterfiets
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Re: Reset Node Height
Reply #6 - Nov 12th, 2013 at 12:27pm
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Hi there Stoyan,

The solution you suggested worked somewhat. This is what i've tried:

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         protected override void OnChildModified(DiagramNode node, AdjustmentHandles handle)
        {
            base.OnChildModified(node, handle);

            if ((node.GetCenter() - this.GetCenter()).Length > 25)
            {
                node.Detach();
                BRNode childNode = node as BRNode;
                if (node == Try_Connected_Node)
                {
                    Try_Connected_Node = null;
                    resizeHeight(newpadding - node.Bounds.Height);
                    Repaint();
                }
                if (node == Catch_Connected_Node)
                {
                    Catch_Connected_Node = null;
                    resizeHeight(newpadding - node.Bounds.Height);
                    Repaint();
                }
                if (node == connected_node)
                {
                    connected_node = null;
                    childNode.parent_node = null;
                }
            }
        }


The next problem occurs. When i drag a node into the E shape it will resize. But when i move the node out of the E shape, the resized node stay the same and only centers the mid arm of E but doesnt reset the whole shape to its original size. What am i doing wrong?

Thanks in advance.

Greets,

Sander
  
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Stoyo
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Re: Reset Node Height
Reply #7 - Nov 12th, 2013 at 1:54pm
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The resizeHeight in last test project I have from you doesn't do anything, because lastInflatedNode is set to this:

Code
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version  public void resizeHeight(double height_to_add)
{
    // Change the bounds of the node according to the size of the child node
    if (lastInflatedNode != this)
    ...


I suppose you should reset it to null after drag-and-drop operations, or remove the check altogether if you will always be calculating height based on current children.

I hope that helps,
Stoyan
  
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Waterfiets
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Re: Reset Node Height
Reply #8 - Nov 12th, 2013 at 2:08pm
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Hi,

resizeHeight is now doing this atm:

Code
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            if (lastInflatedNode != this)
            {
                if (lastInflatedNode != null)
                    lastInflatedNode.Bounds = lastBounds;

                double tryHeight = Try_Connected_Node != null ? Try_Connected_Node.Bounds.Height : padding;
                double catchHeight = Catch_Connected_Node != null ? Catch_Connected_Node.Bounds.Height : padding;


                var newHeight = 3 * padding + tryHeight + catchHeight;

                Rect r = this.Bounds;
                lastBounds = r;

                Rect newBounds = new Rect(r.X, r.Y, r.Width, newHeight);
                this.SetBounds(newBounds, false, true);
                lastInflatedNode = this;
            }
  
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Stoyo
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Re: Reset Node Height
Reply #9 - Nov 12th, 2013 at 6:53pm
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That's fine, but does it ever run the code inside that if block when you call it from OnChildModified? Add a breakpoint to the resizeHeight(newpadding - node.Bounds.Height) line and trace with the debugger to see what happens. You should either set lastInflatedNode to null after drag and drop completes, or move the code that calculates height from child nodes out of the if block.

I hope that helps,
Stoyan
  
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Waterfiets
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Re: Reset Node Height
Reply #10 - Nov 13th, 2013 at 9:22am
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Hi there,

After tracing it with the debugger i found out the resizeHeight methode did get called in OnChildModified. Also, the lastInflatedNode = null was already set after drag and drop completes. After i moved the code that calculates the height from the child nodes outside of the if block it started to work.  Cheesy

Greets,

Sander
  
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