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<div class="ChapSects"><a href="chap2_mj.html#X7FD77853879BC3F6">2 <span class="Heading">Francy Callbacks</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X7CC6903E78F24167">2.1 <span class="Heading">Categories</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7961360C802B12AF">2.1-1 IsCallback</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7B5CD72681DECF6C">2.1-2 IsRequiredArg</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7B7E0C807948B7AF">2.1-3 IsArgType</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X8563CE3284411B39">2.1-4 IsTriggerType</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X846063757EC05986">2.2 <span class="Heading">Families</span></a>
</span>
</div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X7EABCC537D3BC549">2.3 <span class="Heading">Representations</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X810BE3BC849642C6">2.3-1 IsCallbackRep</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X81CE336A8401CCFA">2.3-2 IsRequiredArgRep</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X8154ABB67C695006">2.3-3 IsArgTypeRep</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7D26E6EB7C6CD408">2.3-4 IsTriggerTypeRep</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X7DE8E16C7C2D387B">2.4 <span class="Heading">Operations</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X8039D4AA7A14B983">2.4-1 Callback</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X79FB842583B96033">2.4-2 NoopCallback</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X842979BE7C0694A1">2.4-3 RequiredArg</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7AF6D2BC85C96A6D">2.4-4 Trigger</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X83FF6BEE7DBC8617">2.4-5 Add</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7F67A0CE8601BE21">2.4-6 Remove</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X859DA3398653FCC5">2.5 <span class="Heading">Globals</span></a>
</span>
</div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2_mj.html#X7C701DBF7BAE649A">2.6 <span class="Heading">Attributes</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7A58A55E806E5F68">2.6-1 Title</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7A58A55E806E5F68">2.6-2 Title</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7888408386F15D29">2.6-3 SetTitle</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X78733FD481F16F77">2.6-4 Value</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X78733FD481F16F77">2.6-5 Value</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7C4F7F027E8AF083">2.6-6 SetValue</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X87AA56767C7BB01F">2.6-7 ConfirmMessage</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X87AA56767C7BB01F">2.6-8 ConfirmMessage</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap2_mj.html#X7F4046A17BBE64F1">2.6-9 SetConfirmMessage</a></span>
</div></div>
</div>
<h3>2 <span class="Heading">Francy Callbacks</span></h3>
<p><code class="code">Callbacks</code> are objects holding a <code class="code">Function</code>, a list of arguments and a trigger event. <code class="code">Callbacks</code> are used to execute GAP code from a remote client using the <code class="code">Trigger</code> Operation.</p>
<p><code class="code">Callbacks</code> can be added directly to <code class="code">Menus</code> and <code class="code">Shapes</code>.</p>
<p>Please see Francy-JS for client implementation.</p>
<p><a id="X7CC6903E78F24167" name="X7CC6903E78F24167"></a></p>
<h4>2.1 <span class="Heading">Categories</span></h4>
<p>In this section we show all Francy Callback Categories.</p>
<p><a id="X7961360C802B12AF" name="X7961360C802B12AF"></a></p>
<h5>2.1-1 IsCallback</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsCallback</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Identifies <code class="code">Callback</code> objects.</p>
<p><a id="X7B5CD72681DECF6C" name="X7B5CD72681DECF6C"></a></p>
<h5>2.1-2 IsRequiredArg</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsRequiredArg</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Identifies <code class="code">RequiredArg</code> objects.</p>
<p><a id="X7B7E0C807948B7AF" name="X7B7E0C807948B7AF"></a></p>
<h5>2.1-3 IsArgType</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsArgType</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Identifies <code class="code">ArgType</code> objects.</p>
<p><a id="X8563CE3284411B39" name="X8563CE3284411B39"></a></p>
<h5>2.1-4 IsTriggerType</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsTriggerType</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Identifies <code class="code">TriggerType</code> objects.</p>
<p><a id="X846063757EC05986" name="X846063757EC05986"></a></p>
<h4>2.2 <span class="Heading">Families</span></h4>
<p>In this section we show all Francy Callback Families.</p>
<p><a id="X7EABCC537D3BC549" name="X7EABCC537D3BC549"></a></p>
<h4>2.3 <span class="Heading">Representations</span></h4>
<p>In this section we show all Francy Callback Representations.</p>
<p><a id="X810BE3BC849642C6" name="X810BE3BC849642C6"></a></p>
<h5>2.3-1 IsCallbackRep</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsCallbackRep</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Checks whether an <code class="code">Object</code> has a <code class="code">Callback</code> internal representation.</p>
<p><a id="X81CE336A8401CCFA" name="X81CE336A8401CCFA"></a></p>
<h5>2.3-2 IsRequiredArgRep</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsRequiredArgRep</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Checks whether an <code class="code">Object</code> has a <code class="code">RequiredArg</code> internal representation.</p>
<p><a id="X8154ABB67C695006" name="X8154ABB67C695006"></a></p>
<h5>2.3-3 IsArgTypeRep</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsArgTypeRep</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Checks whether an <code class="code">Object</code> has a <code class="code">ArgType</code> internal representation.</p>
<p><a id="X7D26E6EB7C6CD408" name="X7D26E6EB7C6CD408"></a></p>
<h5>2.3-4 IsTriggerTypeRep</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsTriggerTypeRep</code>( <var class="Arg">arg</var> )</td><td class="tdright">( filter )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code></p>
<p>Checks whether an <code class="code">Object</code> has a <code class="code">TriggerType</code> internal representation.</p>
<p><a id="X7DE8E16C7C2D387B" name="X7DE8E16C7C2D387B"></a></p>
<h4>2.4 <span class="Heading">Operations</span></h4>
<p>In this section we show all Francy Callback Operations.</p>
<p><a id="X8039D4AA7A14B983" name="X8039D4AA7A14B983"></a></p>
<h5>2.4-1 Callback</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Callback</code>( <var class="Arg">IsTriggerType</var>, <var class="Arg">IsFunction</var>, <var class="Arg">IsList(object)</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: <code class="code">Callback</code></p>
<p>Creates a <code class="code">Callback</code> object that holds a <code class="code">Function</code> and the <code class="code">RequiredArgs</code> to be executed by a <code class="code">TriggerType</code>.</p>
<p><em>Please note, the Function must always <code class="code">Return</code></em></p>
<p>Examples:</p>
<p>Create a simple <code class="code">Callback</code> with no arguments:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function() return "Hello World!"; end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(MyFunction);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Id(callback);</span>
</pre></div>
<p>Create a <code class="code">Callback</code> with one required argument of type string:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function(str) return Concatenation("Hello", " ", str); end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(MyFunction);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">arg := RequiredArg(ArgType.STRING, "Your Name");</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Add(callback, arg);</span>
</pre></div>
<p>Create a <code class="code">Callback</code> with one known argument of type string:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function(args) return args; end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(MyFunction, ["Hello World"]);</span>
</pre></div>
<p>Create a <code class="code">Callback</code> with one known argument and one required argument of type string:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function(a,b) return Concatenation(a, b); end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(MyFunction, ["Hello "]);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">arg := RequiredArg(ArgType.STRING, "Your Name");</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Add(callback, arg);</span>
</pre></div>
<p>Create a <code class="code">Callback</code> with one known argument and one required argument of type string and double click trigger Type:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function(a,b) return Concatenation(a, b); end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(TriggerType.DOUBLE_CLICK, MyFunction, ["Hello "]);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">arg := RequiredArg(ArgType.STRING, "Your Name");</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Add(callback, arg);</span>
</pre></div>
<p>In order to see the output of the previous examples, we have to simulate the external call to <code class="code">Trigger</code> operation:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">MyFunction := function(a,b) return Concatenation(a, b); end;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := Callback(TriggerType.DOUBLE_CLICK, MyFunction, ["Hello "]);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">arg := RequiredArg(ArgType.STRING, "Your Name");</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">SetTitle(arg, "Enter your name");</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Title(arg);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Add(callback, arg);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">SetValue(arg, "Manuel"); # simulate the user input</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Value(arg);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Trigger(GapToJsonString(Sanitize(callback))); # simulate the external trigger</span>
</pre></div>
<p>Create a Noop Callback, useful for Menu holders, where no <code class="code">Function</code> is required:</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">callback := NoopCallback();</span>
</pre></div>
<p><a id="X79FB842583B96033" name="X79FB842583B96033"></a></p>
<h5>2.4-2 NoopCallback</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; NoopCallback</code>( )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: <code class="code">Callback</code></p>
<p>Creates an empty <code class="code">Callback</code> object that does nothing. Useful to create menu holders.</p>
<p><a id="X842979BE7C0694A1" name="X842979BE7C0694A1"></a></p>
<h5>2.4-3 RequiredArg</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; RequiredArg</code>( <var class="Arg">IsArgType</var>, <var class="Arg">IsString(title)</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: <code class="code">RequiredArg</code></p>
<p>Creates a <code class="code">Callback</code> with a <code class="code">RequiredArg</code>. <code class="code">RequiredArg</code> is user input driven and required for the execution of a <code class="code">Callback</code> <code class="code">Function</code>. The value for this argument will be provided by the user.</p>
<p><a id="X7AF6D2BC85C96A6D" name="X7AF6D2BC85C96A6D"></a></p>
<h5>2.4-4 Trigger</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Trigger</code>( <var class="Arg">IsString(JSON)</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: the result of the execution of the <code class="code">Callback</code> defined <code class="code">Function</code></p>
<p>Triggers a <code class="code">Callback</code> <code class="code">Function</code> in GAP. Gets a JSON String object representation of the callback to execute.</p>
<p><a id="X83FF6BEE7DBC8617" name="X83FF6BEE7DBC8617"></a></p>
<h5>2.4-5 Add</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Add</code>( <var class="Arg">IsCallback</var>[, <var class="Arg">IsRequiredArg</var>, <var class="Arg">List(IsRequiredArg)</var>] )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: <code class="code">Callback</code></p>
<p>Adds a <code class="code">RequiredArg</code> to a specific <code class="code">Callback</code>.</p>
<p><a id="X7F67A0CE8601BE21" name="X7F67A0CE8601BE21"></a></p>
<h5>2.4-6 Remove</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Remove</code>( <var class="Arg">IsCallback</var>[, <var class="Arg">IsRequiredArg</var>, <var class="Arg">List(IsRequiredArg)</var>] )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: <code class="code">Callback</code></p>
<p>Removes a <code class="code">RequiredArg</code> from a specific <code class="code">Callback</code>.</p>
<p><a id="X859DA3398653FCC5" name="X859DA3398653FCC5"></a></p>
<h4>2.5 <span class="Heading">Globals</span></h4>
<p>In this section we show the Global Callback Francy Records for multi purpose.</p>
<p><a id="X7C701DBF7BAE649A" name="X7C701DBF7BAE649A"></a></p>
<h4>2.6 <span class="Heading">Attributes</span></h4>
<p>In this section we show the Francy Callback Attributes</p>
<p><a id="X7A58A55E806E5F68" name="X7A58A55E806E5F68"></a></p>
<h5>2.6-1 Title</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Title</code>( <var class="Arg">arg</var> )</td><td class="tdright">( attribute )</td></tr></table></div>
<p>Returns: <code class="code">IsString</code> with the title of the object</p>
<p>A title on a <code class="code">RequiredArg</code> is used to retrieve input from a user.</p>
<p><a id="X7A58A55E806E5F68" name="X7A58A55E806E5F68"></a></p>
<h5>2.6-2 Title</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Title</code>( <var class="Arg">arg1</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p><a id="X7888408386F15D29" name="X7888408386F15D29"></a></p>
<h5>2.6-3 SetTitle</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; SetTitle</code>( <var class="Arg">IsRequiredArg</var>, <var class="Arg">IsString</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Sets the title of the <code class="code">RequiredArg</code>.</p>
<p><a id="X78733FD481F16F77" name="X78733FD481F16F77"></a></p>
<h5>2.6-4 Value</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Value</code>( <var class="Arg">arg</var> )</td><td class="tdright">( attribute )</td></tr></table></div>
<p>Returns: <code class="code">IsString</code> with the value of the object</p>
<p>A value on a <code class="code">RequiredArg</code> is the actual input value to be passed to back gap from the client GUI. These values are stored as <code class="code">String</code> for convenience, even if the <code class="code">ArgType</code> specified for the <code class="code">RequiredArg</code> is of another type. Hence, explicit conversion is required within the <code class="code">Callback</code> <code class="code">Function</code>.</p>
<p><a id="X78733FD481F16F77" name="X78733FD481F16F77"></a></p>
<h5>2.6-5 Value</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; Value</code>( <var class="Arg">arg1</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p><a id="X7C4F7F027E8AF083" name="X7C4F7F027E8AF083"></a></p>
<h5>2.6-6 SetValue</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; SetValue</code>( <var class="Arg">IsRequiredArg</var>, <var class="Arg">IsString</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Sets the value of the <code class="code">RequiredArg</code>.</p>
<p><a id="X87AA56767C7BB01F" name="X87AA56767C7BB01F"></a></p>
<h5>2.6-7 ConfirmMessage</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ConfirmMessage</code>( <var class="Arg">arg</var> )</td><td class="tdright">( attribute )</td></tr></table></div>
<p>Returns: a <code class="code">IsString</code> with the message to be shown to the user before the <code class="code">Callback</code> execution.</p>
<p>This will display a confirmation message before any <code class="code">Callback</code> is executed.</p>
<p><a id="X87AA56767C7BB01F" name="X87AA56767C7BB01F"></a></p>
<h5>2.6-8 ConfirmMessage</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ConfirmMessage</code>( <var class="Arg">arg1</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p><a id="X7F4046A17BBE64F1" name="X7F4046A17BBE64F1"></a></p>
<h5>2.6-9 SetConfirmMessage</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; SetConfirmMessage</code>( <var class="Arg">IsRequiredArg</var>, <var class="Arg">IsString</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Sets the value of the confirmation message to display to the user.</p>
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