/// <summary>
/// Constructs a sheet by calling <see cref="M:Northwoods.Go.GoSheet.CreatePaper" />,
/// <see cref="M:Northwoods.Go.GoSheet.CreateBackgroundImage" />, and <see cref="M:Northwoods.Go.GoSheet.CreateGrid" />.
/// </summary>
public GoSheet()
{
base.Initializing = true;
myPaper = CreatePaper();
Add(myPaper);
myBackgroundImage = CreateBackgroundImage();
Add(myBackgroundImage);
myGrid = CreateGrid();
Add(myGrid);
myLeft = MakeBoundary();
Add(myLeft);
myRight = MakeBoundary();
Add(myRight);
myTop = MakeBoundary();
Add(myTop);
myBottom = MakeBoundary();
Add(myBottom);
base.Initializing = false;
LayoutChildren(null);
}
/// <summary>
/// Create and initialize a <see cref="T:Northwoods.Go.GoImage" /> or a <see cref="T:Northwoods.Go.GoDrawing" /> to act as the node's icon.
/// </summary>
/// <param name="res">
/// Provides the <c>ResourceManager</c> holding an <c>Image</c> resource named by
/// <paramref name="iconname" />. If this parameter is null,
/// <see cref="P:Northwoods.Go.GoImage.DefaultResourceManager" /> is used instead.
/// </param>
/// <param name="iconname">
/// <para>
/// The name of the <c>Image</c> resource in the <c>ResourceManager</c>
/// given by <paramref name="res" />, or else a file name if no resource manager
/// can be used (i.e., when both <paramref name="res" /> is null and
/// <see cref="P:Northwoods.Go.GoImage.DefaultResourceManager" /> is null).
/// </para>
/// <para>
/// If the value is an empty string, the <c>Image</c> will be blank;
/// you can set <see cref="P:Northwoods.Go.GoIconicNode.Image" />.<see cref="P:Northwoods.Go.GoImage.Name" /> to show or change
/// the image displayed by the <see cref="T:Northwoods.Go.GoImage" /> that is the <see cref="P:Northwoods.Go.GoIconicNode.Image" />.
/// </para>
/// <para>
/// If the value is null, the <see cref="P:Northwoods.Go.GoIconicNode.Icon" /> is not a <see cref="T:Northwoods.Go.GoImage" />
/// but a <see cref="T:Northwoods.Go.GoDrawing" />; you can then set the <see cref="P:Northwoods.Go.GoIconicNode.Figure" />
/// to change the shape shown as the icon.
/// </para>
/// </param>
/// <returns>
/// a <see cref="T:Northwoods.Go.GoImage" />
/// </returns>
/// <example>
/// If you override this method, you may want the definition to do
/// some of the things that the standard definition does:
/// <code>
/// protected virtual GoObject CreateIcon(ResourceManager res, String iconname) {
/// if (iconname != null) {
/// GoImage img = new GoImage();
/// if (res != null)
/// img.ResourceManager = res;
/// img.Name = iconname;
/// img.Selectable = false;
/// img.Resizable = false;
/// return img;
/// } else {
/// GoDrawing rect = new GoDrawing(GoFigure.Rectangle);
/// rect.Selectable = false;
/// rect.Resizable = false;
/// rect.Size = new SizeF(40, 40);
/// return rect;
/// }
/// }
/// </code>
/// </example>
protected virtual GoObject CreateIcon(ResourceManager res, string iconname)
{
if (iconname != null)
{
GoImage goImage = new GoImage();
if (res != null)
{
goImage.ResourceManager = res;
}
goImage.Name = iconname;
goImage.Selectable = false;
goImage.Resizable = false;
return(goImage);
}
return(new GoDrawing(GoFigure.Rectangle)
{
Selectable = false,
Resizable = false,
Size = new SizeF(40f, 40f)
});
}
/// <summary>
/// Update the internal reference fields when a child object is removed.
/// </summary>
/// <param name="obj"></param>
public override bool Remove(GoObject obj)
{
bool result = base.Remove(obj);
if (obj == myPaper)
{
myPaper = null;
return(result);
}
if (obj == myBackgroundImage)
{
myBackgroundImage = null;
return(result);
}
if (obj == myGrid)
{
myGrid = null;
return(result);
}
if (obj == myLeft)
{
myLeft = null;
return(result);
}
if (obj == myRight)
{
myRight = null;
return(result);
}
if (obj == myTop)
{
myTop = null;
return(result);
}
if (obj == myBottom)
{
myBottom = null;
}
return(result);
}