Changes
The Label should be visible as long as at least one of the context object's two named properties has a value.</tab>
</tabs>
==== Simple Calculation ====
The following example shows how to use the control with three parameters, where the first two are user input (Textbox ''Param0'' and ''Param1'') and the third one is a property from its DataContext (ViewModel). The evaluated ''Result'' is then bound to a Textblock for output in the UI.
<source lang = "xml">
<StackLayout StackPanel xmlns:ctrls="clr-namespaceusing:UBIK.CPLWinX.Controls;assembly" HorizontalAlignment=UBIK.CPL"Center" Orientation="Vertical"> <Editor TextBox x:Name="Expression" Width="200" /> <Editor TextBox x:Name="Param0" Width="32200"/> <Editor TextBox x:Name="Param1" Width="43200"/> <ctrls:EvalExpression x:Name="Evaluator" Expression="{Binding ElementName=Expression, Path=Text, Source={x:Reference Expression}}"> <ctrls:EvalExpressionParameter Name="P0" Value="{Binding ElementName=Param0, Path=WidthText, SourceConverter={x:Reference Param0StaticResource ToType}, ConverterParameter='System.Int32'}" /> <ctrls:EvalExpressionParameter Name="P1" Value="{Binding ElementName=Param1, Path=WidthText, SourceConverter={x:Reference Param1StaticResource ToType}, ConverterParameter='System.Int32'}" /> <ctrls:EvalExpressionParameter Name="P2" Value="{Binding IsLoggedIn}" />
</ctrls:EvalExpression>
<Label TextBlock Foreground="White" Text="{Binding PathElementName=ResultEvaluator, SourcePath={x:Reference Evaluator}Result}" /></StackLayoutStackPanel>
</source>
Lets assume that the Textbox ''Param0'' contains a text of 42 and ''Param1'' contains a text of 43. If ''Expression'' now contains <code>(P0 + P1) *2</code> then the result would display 170.
<tab name="Xamarin">
The following example shows how to use the control with three parameters, where the first two are user input (Editor ''Param0'' and ''Param1'') and the third one is a property from its DataContext (ViewModel). The evaluated ''Result'' is then bound to an Label for output in the UI.
<source lang = "xml">
<StackLayout xmlns:ctrls="clr-namespace:UBIK.CPL.Controls;assembly=UBIK.CPL">
<Editor x:Name="Expression" Width="200" />
<Editor x:Name="Param0" Width="32200"/> <Editor x:Name="Param1" Width="43200"/> <ctrls:EvalExpression x:Name="Evaluator" Expression="{Binding ElementName=Expression, Path=Text, Source={x:Reference Expression}}"> <ctrls:EvalExpressionParameter Name="P0" Value="{Binding ElementName=Param0, Path=WidthText, SourceConverter={x:Reference Param0StaticResource ToType}, ConverterParameter='System.Int32'}" /> <ctrls:EvalExpressionParameter Name="P1" Value="{Binding ElementName=Param1, Path=WidthText, SourceConverter={x:Reference Param1StaticResource ToType}, ConverterParameter='System.Int32'}" /> <ctrls:EvalExpressionParameter Name="P2" Value="{Binding IsLoggedIn}" /> </ctrls:EvalExpression> <Label Text="{Binding ElementName=Evaluator, Path=Result, Source={x:Reference Evaluator}}" />
</StackLayout>
</source>Lets assume that the Editor Textbox ''Param0'' has contains a width text of 32 42 and ''Param1'' has contains a width text of 43. If ''Expression'' now contains <code>(P0 + P1) *2</code> then the result would display 170.</tab>
</tabs>
==== Setting a calculated Property Value ====
<Grid xmlns:ctrls="clr-namespace:UBIK.CPL.Controls;assembly=UBIK.CPL">
<controls:EvalExpression x:Name="StatusAutomator" Expression="P0 == true ? P00 : (P1 == true ? P10)" Context="{Binding}">
</controls:EvalExpression>
Text="{Binding Path=Result, Source={x:Reference StatusAutomator}}"
FontSize="16"/>
</tabs>
== Parameters ==
