Hi Mark,
Look, for example, the contents of an element
of the Undo Array. The Undo Array contains
a xml description of all controls placed in
a single card:
The Unique Key for each control is the AltID
of the control, that is set at the moment of
its creation. So, always there is only one control
with such AltID.
You could ask: Why not use the ID of the control
that always would be unique? Because, when you
delete a control, its ID is gone too and if we need
to recreate the control in the card, it would be
necessary to create new controls that will have
a new ID.
The new option that allows to create
a control with a previous ID is only available in
more recent versions of Livecode, and I want
that the stack works fine in all previous versions
of this platform. If it is run in early versions,
then antialiased graphics and gradients would
not be available, but the core and basic functionality
will work fine.
The content of this unique array element
would be like this: (XML from Geoff Canyon
stack: mcRipper)
----------------------------------------------------------
<graphic>
<properties>
<traversalOn>false</traversalOn>
<ink>srcCopy</ink>
<threeD>true</threeD>
<startAngle>0</startAngle>
<blendLevel>0</blendLevel>
<rect>58,102,146,240</rect>
<angle>0</angle>
<filled>true</filled>
<patterns></patterns>
<showName>false</showName>
<colors></colors>
<arcAngle>360</arcAngle>
<dontResize>false</dontResize>
<startArrow>false</startArrow>
<editMode>none</editMode>
<points></points>
<id>1019</id>
<markerDrawn>false</markerDrawn>
<arrowSize>3</arrowSize>
<altId>0</altId>
<antiAliased>true</antiAliased>
<markerFilled>false</markerFilled>
<fillGradient></fillGradient>
<markerLineSize>1</markerLineSize>
<textStyle></textStyle>
<fillRule>none</fillRule>
<lockLoc>false</lockLoc>
<roundRadius>15</roundRadius>
<label></label>
<endArrow>false</endArrow>
<markerPoints></markerPoints>
<dashes></dashes>
<behavior></behavior>
<name></name>
<toolTip></toolTip>
<lineSize>0</lineSize>
<polySides>4</polySides>
<capStyle>round</capStyle>
<layer>2</layer>
<visible>true</visible>
<cantSelect>false</cantSelect>
<borderWidth>2</borderWidth>
<margins>4</margins>
<roundEnds>true</roundEnds>
<opaque>true</opaque>
<showBorder>false</showBorder>
<miterLimit>10</miterLimit>
<textSize></textSize>
<disabled>false</disabled>
<joinStyle>round</joinStyle>
<textFont></textFont>
<strokeGradient></strokeGradient>
<showFocusBorder>true</showFocusBorder>
</properties>
<customPropertySet name="cREVGeneral">
<revUniqueID>1343811387021</revUniqueID>
</customPropertySet>
<customPropertySet name="">
<cpoints></cpoints>
<bpoints></bpoints>
</customPropertySet>
</graphic>
------------------------------------------------------
In this context, Undo would restore a control to its
previous properties or delete it (until Redo, put it back).
Al
--
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