public MyUndoUnit(MyBusinessObject businessObject, double oldValue)
: base("Change Value")
{
this.businessObject = businessObject;
this.oldValue = oldValue;
this.newValue = businessObject.Value;
}
/// <summary>
/// When a node is removed, we detach the event handler.
/// </summary>
private void OnNodeRemoved(object source, ItemEventArgs <INode> evt)
{
MyBusinessObject tag = evt.Item.Tag as MyBusinessObject;
if (tag != null)
{
tag.MyEditEvent -= OnUndoEventHandler;
}
}
public void Paint(IRenderContext context, Graphics graphics)
{
var layout = Node.Layout;
// Draw a rounded rectangle
double roundingX = layout.Width * roundingFactor;
double roundingY = layout.Height * roundingFactor;
MyBusinessObject businessObject = Node.Tag as MyBusinessObject;
GraphicsPath path = new GraphicsPath();
path.AddBezier((float)layout.X, (float)(layout.Y + roundingY), (float)layout.X,
(float)(layout.Y + (roundingY / 2)),
(float)(layout.X + (roundingX / 2)), (float)layout.Y, (float)(layout.X + roundingX), (float)layout.Y);
path.AddLine((float)(layout.X + roundingX), (float)layout.Y, (float)(layout.X + layout.Width - roundingX),
(float)layout.Y);
path.AddBezier((float)(layout.X + layout.Width - roundingX), (float)(layout.Y),
(float)(layout.X + layout.Width - (roundingX / 2)), (float)(layout.Y),
(float)(layout.X + layout.Width), (float)(layout.Y + (roundingY / 2)), (float)(layout.X + layout.Width),
(float)(layout.Y + roundingY));
path.AddLine((float)(layout.X + layout.Width), (float)(layout.Y + roundingY),
(float)(layout.X + layout.Width), (float)(layout.Y + layout.Height - roundingY));
path.AddBezier((float)(layout.X + layout.Width), (float)(layout.Y + layout.Height - roundingY),
(float)(layout.X + layout.Width), (float)(layout.Y + layout.Height - (roundingY / 2)),
(float)(layout.X + layout.Width - (roundingX / 2)), (float)(layout.Y + layout.Height),
(float)(layout.X + layout.Width - roundingX), (float)(layout.Y + layout.Height));
path.AddLine((float)(layout.X + layout.Width - roundingX), (float)(layout.Y + layout.Height),
(float)(layout.X + roundingX), (float)(layout.Y + layout.Height));
path.AddBezier((float)(layout.X + roundingX), (float)(layout.Y + layout.Height),
(float)(layout.X + (roundingX / 2)), (float)(layout.Y + layout.Height),
(float)(layout.X), (float)(layout.Y + layout.Height - (roundingY / 2)), (float)(layout.X),
(float)(layout.Y + layout.Height - roundingY));
path.AddLine((float)layout.X, (float)(layout.Y + layout.Height - roundingY), (float)(layout.X),
(float)(layout.Y + layout.Height - roundingY));
graphics.FillPath(
new LinearGradientBrush(
new RectangleF((float)layout.X, (float)layout.Y, (float)layout.Width, (float)layout.Height),
BackgroundColor, Mix(BackgroundColor, Color.Black, 0.7), 90f), path);
graphics.DrawPath(Pens.LightGray, path);
if (businessObject != null)
{
// Draw a line to vizualize the business object's value
graphics.DrawLine(Pens.Black, (float)(layout.X + 10), (float)(layout.Y + (layout.Height * 3 / 4)),
(float)(layout.X + 10 + (layout.Width - 20) * businessObject.Value),
(float)(layout.Y + (layout.Height * 3 / 4)));
// Display the business object's name
graphics.DrawString("Node", new Font("Arial", 8), Brushes.Black, (float)(layout.X + 10),
(float)layout.Y + 10);
}
}
public void CancelDrag(IInputModeContext inputModeContext, PointD originalLocation)
{
// restore original value
MyBusinessObject myBusinessObject = node.Tag as MyBusinessObject;
if (myBusinessObject != null)
{
myBusinessObject.Value = originalValue;
}
}
public void InitializeDrag(IInputModeContext inputModeContext)
{
// remember the original value so the drag can be cancelled correctly
MyBusinessObject myBusinessObject = node.Tag as MyBusinessObject;
if (myBusinessObject != null)
{
originalValue = myBusinessObject.Value;
}
}
public void DragFinished(IInputModeContext inputModeContext, PointD originalLocation, PointD newLocation)
{
double minVal = node.Layout.X + 10;
double maxVal = node.Layout.X + node.Layout.Width - 10;
double currentVal = newLocation.X;
double ratio = ((currentVal - minVal) / (maxVal - minVal));
MyBusinessObject myBusinessObject = node.Tag as MyBusinessObject;
if (myBusinessObject != null)
{
myBusinessObject.Value = ratio;
}
}