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VerticalLinearScale - change properties takes more than 20 seconds

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שושי
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שושי asked on 06 Nov 2018, 09:42 AM

I have VerticalLinearScale with properties:

Min= 0

Max = 100

MajorTickStep = 20

MiddleTicks = 4

by click on button I changed the values of the properties to:

Min= 0
Max = 30000
MajorTickStep = 5000
MiddleTicks = 10

the problem is that it takes too much time till the element render again with the new values

I couldn't attach the sample

Xaml is:

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <telerik:VerticalLinearScale Min="0" Max="100" x:Name="bar"
                                         IsInteractive="False"
                                         RelativeHeight="0.8"
                                         RangeLocation="Outside"
                                         MajorTickOffset="0.02*"
                                         MiddleTickOffset="0.02*"
                                         MinorTickOffset="0.02*" 
                                         RelativeX="0.5" RelativeY="0.08"
                                         Foreground="Gray" Fill="Red"
                                         MajorTickStroke="Red" MiddleTickStroke="Red"
                                         MiddleTicks="4" MinorTicks="1" MajorTickStep="20">      
            <telerik:VerticalLinearScale.Indicators>
                <telerik:BarIndicator x:Name="VerticalIndicator" Value="{Binding Model.Parameters[0].ValueToDisplay}" BorderBrush="Transparent" Background="{Binding Model.FillColor}"
                                  RangeColorMode="Default" telerik:ScaleObject.Location="OverOutside" StartWidth="{Binding Model.BarWidth}" EndWidth="{Binding Model.BarWidth}"
                                  UseRangeColor="True" Margin="3,0,0,0" EmptyFill="{Binding Model.GaugeColor}" />
            </telerik:VerticalLinearScale.Indicators>        
        </telerik:VerticalLinearScale>
            <Button Content="click" Click="Button_Click" Grid.Row="1"/>
    </Grid>

click event is:

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            bar.Min = 0;
            bar.Max = 30000;
            bar.MajorTickStep = 5000;
            bar.MiddleTicks = 10;
        }

Thanks,

Shoshana

 

 

2 Answers, 1 is accepted

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Dilyan Traykov
Telerik team
answered on 08 Nov 2018, 01:10 PM
Hello Shoshana,

The reason for this delay is that once you set the Max property to 30000, the MajorTickStep is still 20. This will create 1500 ticks with 6000 middle ticks which requires a lot of rendering time. Once you change the MajorTickStep another recalculation of the ticks takes place so that the desired result is achieved.

To overcome this, you have to first set the MajorTickStep to the larger value and then set the Max property.

private void Button_Click(object sender, RoutedEventArgs e)
{
    bar.MajorTickStep = 5000;
    bar.MiddleTicks = 10;
    bar.Min = 0;
    bar.Max = 30000;
}

Please let me know whether this solves your issue.

Regards,
Dilyan Traykov
Progress Telerik
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שושי
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answered on 11 Nov 2018, 06:22 AM

Thanks, It helped me!

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