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<h1>:: Reference :: Cell Constraints ::</h1>
Each component managed by a FormLayout is associated with an instance
of <tt>CellConstraints</tt> that specifies a components
display area and alignment.
The column and row origins are mandatory, but as we will see later, often
a non-visual builder will automatically create the CellConstraints for you.
<p>
By default the column and row span is just 1, and the alignments
are inherited from the related column and row. If possible you should
specify the aligment for the column and row, not for the component;
this way you can reduce the amount of alignment specifications
significantly.
<p>
CellConstraints objects can be constructed in different ways using
a mixture of ints, objects and strings. I recommend to specify
the origin and span using ints and the alignment with strings -
just to increase the code readability.
<h2>Reusing CellConstraints</h2>
You can reuse CellConstraints objects because they are cloned
internally by the FormLayout. Hence you can write a condensed form
<pre>
CellConstraints cc = new CellConstraints();
builder.addLabel("Name", cc.xy(1, 1));
builder.add(nameField, cc.xy(3, 1));
builder.addLabel("Age", cc.xy(1, 3));
builder.add(ageField, cc.xy(3, 3));
</pre>
<h2>Spanning Multiple Columns/Rows</h2>
You can let components span multiple columns or rows,
for example by using the CellConstraints method
<tt>#xywh</tt> where you specify the x and y position
of the leading cell and the width and height of the display area.
<p>
<b>Note:</b> these components do not affect the size of
the spanned columns or rows, nevertheless, they may expand
the whole container. See also the <a href="../faq.html#L.5">FAQ</a>
for details and how to handle this situation.
<h2>Examples</h2>
1) Creation methods intended for use by humans
<pre>
CellConstraints cc = new CellConstraints();
cc.xy(2, 1); // second col, first row
cc.xy(2, 1, "right, bottom"); // aligned to right and bottom
cc.xy(2, 1, "r, b"); // abbreviated alignment
cc.xywh(2, 1, 4, 3); // spans 4 cols, 3 rows
cc.xywh(2, 1, 4, 3, "right, bottom");
cc.xywh(2, 1, 4, 3, "r, b");
</pre>
2) Constructors intended for builders<pre>
new CellConstraints(); // first col, first row
new CellConstraints(2, 1);
new CellConstraints(2, 1, 4, 3);
new CellConstraints(2, 1, CellConstraints.RIGHT,
CellConstraints.BOTTOM);
</pre>
3) Constructors intended for building UIs from XML<pre>
CellConstraints cc = new CellConstraints();
new CellConstraints("2, 1");
new CellConstraints("2, 1, r, b");
new CellConstraints("2, 1, 4, 3");
new CellConstraints("2, 1, 4, 3, r, b");
</pre>
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