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<title>GAMGI Interfaces: Layer Link</title>
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<h1>Layer Link</h1>
<div id="notebook">
<ul>
<li><span>Object</span></li>
<li><a href="link_shift.html">Shift</a></li>
</ul>
</div>
<div class="contents">
Link a layer or a list of layers to other objects.
<h3>Hierarchy</h3>
Layers can be linked to objects above or below, in the Gamgi hierarchy.
Pressing the button <b>Below</b> (the default), the class menu shows
the classes of objects that can be owned by layers. Pressing the button
<b>Above</b>, the same menu shows <b>Window</b>, the only class of
objects that can own layers.
<p/>
Gamgi expects users to identify first the layer or list of layers to link.
When the <b>Layer</b> entry is active and empty, clicking the mouse over
the window graphic area creates a menu with all the window layers (local
selection), which can then be selected. The current layer is initially
proposed in the <b>Layer</b> entry. Pressing the <b>List</b> button,
the current list of layers is selected instead.
<p/>
Gamgi is now expecting users to click on a object of the class
currently selected in the class menu. This object can be in
a different layer or window (global selection). To select
a visible object, just press the mouse over the object,
in its window. To select objects without visual representation,
such as windows and lights, press the mouse over a window
graphic area, to create a menu with all the objects of that
class, which can then be selected.
<h3>Method</h3>
Gamgi suppports only one method to link layers: <b>Object</b>.
<p/>
The <b>Object</b> method links a layer or a list of layers
to a single object, <b>Above</b> or <b>Below</b>.
<p/>
When linking a layer and the <b>Hierarchy</b> is <b>Above</b>, the layer
is unlinked from its current window and linked to the new one.
The layer history kept by the <b>Undo</b> and <b>Save</b>
mechanisms is preserved in this operation.
<p/>
When the <b>Hierarchy</b> is <b>Below</b>, the child object is
unlinked from its current parent and linked to the layer. An error
is issued when the parent already owned the child object.
<p/>
After the linking operation, Gamgi always puts on top
the window and layer containing the linked objects.
<p/>
When linking a list of layers <b>Above</b>, all layers in the list
are unlinked and linked to the parent window. When linking a list
of layers <b>Below</b>, the child object is replicated as many times
as necessary to link each layer in the list to a different replica.
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