Questions on UI for Xamarin Forum

1 answer

24 views

Issue with Axis HorizontalLocation in Xamarin.Forms using Telerik Chart

Dear Telerik Support Team,

I am experiencing a Java.Lang.IncompatibleClassChangeError in my Xamarin.Forms app when setting verticalAxisBar.HorizontalLocation = Com.Telerik.Widget.Chart.Engine.Axes.Common.AxisHorizontalLocation.Right in the Android APK. Removing this line stops the crash, but the axis defaults to the left, which isn’t ideal for my layout requirements, as I need it aligned to the right.

I’ve tried downgrading the Telerik library, but the issue persists. Could you advise if there’s a workaround or an alternative approach for setting the axis location to the right in Android builds?

Chart

Chart - Xamarin.Android

answered on 14 Nov 2024

1 answer

37 views

Modify week view in RadCalendar

Hi

I im using the RadCalendar on mode day (image attached) and i need to modify the upper week days line - to be smaller and include only the day of month, and exclude the abbreviated daily tasks.

I couldnt find any lead in the documentations.
I have created custom renderer but i really struggle to find the right way to achieve this.

Calendar - Xamarin.Android

Calendar & Scheduling

answered on 16 Jul 2024

3 answers

696 views

RadCartesianChart and NumericalAxis - 46080 outstanding GREFs. Performing a full GC

Hello everyone,

I'm implementing a real-time chart to draw a scatter plot using as points two signals (each signal has a sampling frequency of 25 Hz). Every seconds I update the plot with the latest 25 points that I receive from a Bluetooth device.

To do this, I use as horizontal and vertical axis two NumericalAxis.

<telerikChart:RadCartesianChart.HorizontalAxis>
	<telerikChart:NumericalAxis
		LabelTextColor="{AppThemeBinding Light={StaticResource TextColorWithLightBackground}, Dark={StaticResource TextColorWithDarkBackground}}"
		MajorStep="{Binding MajorStepX}"
		Maximum="{Binding MaxValueX}"
		Minimum="{Binding MinValueX}"
		RangeExtendDirection="Both"
		ShowLabels="True" />
</telerikChart:RadCartesianChart.HorizontalAxis>

<telerikChart:RadCartesianChart.VerticalAxis>
	<telerikChart:NumericalAxis
		LabelTextColor="{AppThemeBinding Light={StaticResource TextColorWithLightBackground}, Dark={StaticResource TextColorWithDarkBackground}}"
		MajorStep="{Binding MajorStepZ}"
		Maximum="{Binding MaxValueZ}"
		Minimum="{Binding MinValueZ}"
		RangeExtendDirection="Both"
		ShowLabels="True" />
</telerikChart:RadCartesianChart.VerticalAxis>

In order to draw the scatter plot I use ScatterSplineSeries as follow:

<telerikChart:RadCartesianChart.Series>
	<telerikChart:ScatterSplineSeries
		ItemsSource="{Binding SwayProjection}"
		Stroke="{StaticResource AccentColor}"
		XValueBinding="ValueX"
		YValueBinding="ValueZ"/>
</telerikChart:RadCartesianChart.Series>

The variable that I bind to the xaml code is an ObservableCollection

private ObservableCollection<Sway> swayProjection;
public ObservableCollection<Sway> SwayProjection
{
     get => swayProjection;
     set => Set(ref swayProjection, value);
}

public class Sway
{
	public double ValueX { get; set; }

	public double ValueZ { get; set; }

	public Sway(double valueX = 0, double valueZ = 0)
	{
		ValueX = valueX;

		ValueZ = valueZ;
	}
}

When I run the real-time visualization, the application seems fine till the free Garbage Collector memory starts to decrease, and when the memory is full the application stops working, it does not respond to any input. The crash happens after 2 minutes I open the chart.

Here the output during debug:

Explicit concurrent copying GC freed 54001(1408KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 11MB/22MB, paused 103us total 96.085ms
 Explicit concurrent copying GC freed 37609(991KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 11MB/22MB, paused 97us total 96.957ms
 Explicit concurrent copying GC freed 53557(1390KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 11MB/23MB, paused 125us total 108.540ms
 Explicit concurrent copying GC freed 53581(1405KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 12MB/24MB, paused 136us total 116.409ms
 Explicit concurrent copying GC freed 37643(1151KB) AllocSpace objects, 0(0B) LOS objects, 48% free, 12MB/24MB, paused 132us total 118.569ms
 Explicit concurrent copying GC freed 53218(1373KB) AllocSpace objects, 0(0B) LOS objects, 47% free, 13MB/25MB, paused 136us total 122.932ms
 Explicit concurrent copying GC freed 37110(1008KB) AllocSpace objects, 0(0B) LOS objects, 46% free, 13MB/25MB, paused 129us total 122.942ms
 Explicit concurrent copying GC freed 39885(1059KB) AllocSpace objects, 0(0B) LOS objects, 46% free, 13MB/25MB, paused 89us total 119.415ms
 Explicit concurrent copying GC freed 50296(1335KB) AllocSpace objects, 0(0B) LOS objects, 45% free, 14MB/26MB, paused 92us total 121.345ms
 Explicit concurrent copying GC freed 53232(1393KB) AllocSpace objects, 0(0B) LOS objects, 45% free, 14MB/26MB, paused 89us total 126.493ms
Thread started:  #20
 Explicit concurrent copying GC freed 37745(1016KB) AllocSpace objects, 0(0B) LOS objects, 44% free, 14MB/26MB, paused 105us total 129.328ms
 Explicit concurrent copying GC freed 53039(1361KB) AllocSpace objects, 0(0B) LOS objects, 43% free, 15MB/27MB, paused 90us total 132.925ms
 Explicit concurrent copying GC freed 40331(1060KB) AllocSpace objects, 0(0B) LOS objects, 43% free, 15MB/27MB, paused 96us total 134.657ms
 Explicit concurrent copying GC freed 50412(1336KB) AllocSpace objects, 0(0B) LOS objects, 42% free, 16MB/28MB, paused 138us total 144.375ms
 Explicit concurrent copying GC freed 40573(1077KB) AllocSpace objects, 0(0B) LOS objects, 42% free, 16MB/28MB, paused 129us total 156.344ms
 Explicit concurrent copying GC freed 50866(1317KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 137us total 155.731ms
 Explicit concurrent copying GC freed 36935(1008KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 87us total 148.042ms
 Explicit concurrent copying GC freed 3790(174KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 89us total 146.685ms
 Explicit concurrent copying GC freed 6140(190KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 93us total 145.927ms
Thread started:  #21
 Explicit concurrent copying GC freed 8523(291KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 90us total 147.018ms
 Explicit concurrent copying GC freed 4160(171KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 154us total 165.773ms
[Choreographer] Skipped 34 frames!  The application may be doing too much work on its main thread.
 Explicit concurrent copying GC freed 5686(207KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 87us total 148.642ms
Thread started:  #22
 Explicit concurrent copying GC freed 8239(291KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 87us total 148.701ms
 Explicit concurrent copying GC freed 3547(118KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 87us total 149.489ms
 Explicit concurrent copying GC freed 1524(65KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 93us total 148.620ms
 Explicit concurrent copying GC freed 2017(92KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 99us total 150.422ms
[Choreographer] Skipped 75 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=1280ms; Flags=0, IntendedVsync=259755680782292, Vsync=259756930782242, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259756931310244, AnimationStart=259756931314168, PerformTraversalsStart=259756931316091, DrawStart=259756940541437, SyncQueued=259756946356668, SyncStart=259756947254360, IssueDrawCommandsStart=259756948458783, SwapBuffers=259756959868129, FrameCompleted=259756961742821, DequeueBufferDuration=648115, QueueBufferDuration=706538, GpuCompleted=259691497209253, 
 Explicit concurrent copying GC freed 10564(315KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 89us total 150.219ms
 Explicit concurrent copying GC freed 5088(148KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 97us total 151.665ms
 Explicit concurrent copying GC freed 11824(330KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 89us total 152.310ms
[monodroid-gc] 46080 outstanding GREFs. Performing a full GC!
 Explicit concurrent copying GC freed 21960(978KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 110us total 148.285ms
Thread started:  #23
Thread started: <Thread Pool> #24
Thread started: <Thread Pool> #25
 Explicit concurrent copying GC freed 4495(218KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 92us total 144.743ms
[Choreographer] Skipped 178 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=3000ms; Flags=0, IntendedVsync=259757682371890, Vsync=259760649038438, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259760657666550, AnimationStart=259760657669280, PerformTraversalsStart=259760657670626, DrawStart=259760661536549, SyncQueued=259760665160473, SyncStart=259760665820819, IssueDrawCommandsStart=259760666742819, SwapBuffers=259760679965934, FrameCompleted=259760683168857, DequeueBufferDuration=411962, QueueBufferDuration=2081000, GpuCompleted=259693826313597, 
 Explicit concurrent copying GC freed 6209(182KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 123us total 146.406ms
 Explicit concurrent copying GC freed 8105(295KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 91us total 146.014ms
 Explicit concurrent copying GC freed 2375(98KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 90us total 146.947ms
 Explicit concurrent copying GC freed 1624(73KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 87us total 145.344ms
 Explicit concurrent copying GC freed 2334(94KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 16MB/28MB, paused 96us total 146.540ms
[Choreographer] Skipped 71 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=1218ms; Flags=0, IntendedVsync=259760929756570, Vsync=259762113089856, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259762126559818, AnimationStart=259762126563395, PerformTraversalsStart=259762126564548, DrawStart=259762130274548, SyncQueued=259762132692010, SyncStart=259762133975125, IssueDrawCommandsStart=259762135384433, SwapBuffers=259762147486587, FrameCompleted=259762149105087, DequeueBufferDuration=850847, QueueBufferDuration=729846, GpuCompleted=259695480535365, 
 Explicit concurrent copying GC freed 12465(349KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 92us total 147.570ms
 Explicit concurrent copying GC freed 1804(113KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 98us total 147.534ms
[Choreographer] Skipped 47 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=808ms; Flags=0, IntendedVsync=259762196173073, Vsync=259762979506375, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259762982768817, AnimationStart=259762982772048, PerformTraversalsStart=259762982773240, DrawStart=259762986505202, SyncQueued=259762989613125, SyncStart=259762990501586, IssueDrawCommandsStart=259762991509317, SwapBuffers=259763003695702, FrameCompleted=259763005409932, DequeueBufferDuration=554692, QueueBufferDuration=627500, GpuCompleted=259695529888327, 
 Explicit concurrent copying GC freed 5908(174KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 95us total 148.675ms
 Explicit concurrent copying GC freed 8677(268KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 91us total 147.561ms
 Explicit concurrent copying GC freed 2097(91KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 90us total 148.625ms
 Explicit concurrent copying GC freed 2454(87KB) AllocSpace objects, 0(0B) LOS objects, 41% free, 17MB/29MB, paused 96us total 149.302ms
 Explicit concurrent copying GC freed 6080(146KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 155us total 153.549ms
 Explicit concurrent copying GC freed 7544(253KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 103us total 149.711ms
 Explicit concurrent copying GC freed 2263(100KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 87us total 150.617ms
 Explicit concurrent copying GC freed 1884(90KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 91us total 150.828ms
 Explicit concurrent copying GC freed 5253(143KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 99us total 152.274ms
 Explicit concurrent copying GC freed 9370(293KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 88us total 152.580ms
 WaitForGcToComplete blocked HeapTrim on HeapTrim for 113.879ms
 Explicit concurrent copying GC freed 2924(95KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 86us total 152.194ms
[Choreographer] Skipped 64 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=1112ms; Flags=0, IntendedVsync=259766080396331, Vsync=259767147062955, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259767157555199, AnimationStart=259767157558660, PerformTraversalsStart=259767157560237, DrawStart=259767161963160, SyncQueued=259767165363122, SyncStart=259767167661429, IssueDrawCommandsStart=259767169690276, SwapBuffers=259767192783083, FrameCompleted=259767195062814, DequeueBufferDuration=871500, QueueBufferDuration=890423, GpuCompleted=259697348532518, 
 Explicit concurrent copying GC freed 2767(96KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 92us total 154.368ms
 Explicit concurrent copying GC freed 10723(323KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 89us total 154.010ms
 Explicit concurrent copying GC freed 3175(116KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 95us total 151.236ms
 Explicit concurrent copying GC freed 1914(100KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 97us total 152.201ms
[Choreographer] Skipped 69 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=1184ms; Flags=0, IntendedVsync=259767345916285, Vsync=259768495916239, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259768505676198, AnimationStart=259768505679275, PerformTraversalsStart=259768505680621, DrawStart=259768509933005, SyncQueued=259768513841467, SyncStart=259768514441928, IssueDrawCommandsStart=259768515314852, SwapBuffers=259768529545544, FrameCompleted=259768531037890, DequeueBufferDuration=359039, QueueBufferDuration=625423, GpuCompleted=259697745192902, 
 Explicit concurrent copying GC freed 11713(341KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 91us total 154.326ms
 Explicit concurrent copying GC freed 3475(107KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 90us total 153.946ms
 Explicit concurrent copying GC freed 1556(75KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 91us total 153.783ms
[Choreographer] Skipped 66 frames!  The application may be doing too much work on its main thread.
 Explicit concurrent copying GC freed 2085(86KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 92us total 155.068ms
[OpenGLRenderer] Davey! duration=1315ms; Flags=0, IntendedVsync=259768529240526, Vsync=259769629240482, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259769636190158, AnimationStart=259769636193774, PerformTraversalsStart=259769636195274, DrawStart=259769805658197, SyncQueued=259769819669312, SyncStart=259769821524043, IssueDrawCommandsStart=259769823533197, SwapBuffers=259769845143043, FrameCompleted=259769846971543, DequeueBufferDuration=1190192, QueueBufferDuration=710385, GpuCompleted=259698033340825, 
 Explicit concurrent copying GC freed 11329(324KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 94us total 156.586ms
 Explicit concurrent copying GC freed 3044(96KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 97us total 155.286ms
 Explicit concurrent copying GC freed 1218(84KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 198us total 198.457ms
[Choreographer] Skipped 82 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=1416ms; Flags=0, IntendedVsync=259769862825707, Vsync=259771229492319, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259771246019542, AnimationStart=259771246022888, PerformTraversalsStart=259771246024042, DrawStart=259771250091388, SyncQueued=259771253344003, SyncStart=259771254218388, IssueDrawCommandsStart=259771255703311, SwapBuffers=259771278216850, FrameCompleted=259771280275119, DequeueBufferDuration=872346, QueueBufferDuration=799077, GpuCompleted=259699580866901, 
 Explicit concurrent copying GC freed 2861(144KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 93us total 156.503ms
Thread started:  #26
 Explicit concurrent copying GC freed 10130(291KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 92us total 157.316ms
 Explicit concurrent copying GC freed 2186(99KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 90us total 156.936ms
 WaitForGcToComplete blocked HeapTrim on HeapTrim for 139.886ms
 Explicit concurrent copying GC freed 1817(96KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 89us total 158.241ms
Thread started:  #27
[monodroid-gc] 46080 outstanding GREFs. Performing a full GC!
 Explicit concurrent copying GC freed 7884(366KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 17MB/29MB, paused 111us total 157.799ms
Thread started:  #28
[Choreographer] Skipped 228 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=3829ms; Flags=0, IntendedVsync=259771262632157, Vsync=259775062632005, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259775069390385, AnimationStart=259775069393578, PerformTraversalsStart=259775069394693, DrawStart=259775072466808, SyncQueued=259775075405501, SyncStart=259775076655193, IssueDrawCommandsStart=259775077766655, SwapBuffers=259775091314693, FrameCompleted=259775093159731, DequeueBufferDuration=558885, QueueBufferDuration=665462, GpuCompleted=259699626355785, 
 Explicit concurrent copying GC freed 14246(407KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 90us total 157.501ms
 Explicit concurrent copying GC freed 3151(117KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 96us total 155.908ms
 Explicit concurrent copying GC freed 2896(104KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 93us total 155.947ms
[Choreographer] Skipped 54 frames!  The application may be doing too much work on its main thread.
[OpenGLRenderer] Davey! duration=940ms; Flags=0, IntendedVsync=259775145639729, Vsync=259776045639693, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=259776062107808, AnimationStart=259776062111692, PerformTraversalsStart=259776062113808, DrawStart=259776069209269, SyncQueued=259776072746962, SyncStart=259776073519885, IssueDrawCommandsStart=259776074474846, SwapBuffers=259776084769231, FrameCompleted=259776086417731, DequeueBufferDuration=507192, QueueBufferDuration=666539, GpuCompleted=259700829677131, 
 Explicit concurrent copying GC freed 11216(340KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 89us total 157.274ms
 Explicit concurrent copying GC freed 2596(103KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 18MB/30MB, paused 100us total 159.401ms

This event does not happen if one of the two axis is CategoricalAxis.I run a test where I left the real-time chart opened for 8 minutes.

Did everyone experience similar trouble? Is there any workaround to avoid the application crash?
I had the opportunity to see this behavior in my app only on Android.

Thanks in advance.

Chart

Chart - Xamarin.Android

answered on 05 Jul 2024

0 answers

52 views

BarSeries - Customize Series Label

Hello,

Is there any way to change the position of Series Label ? And font size ?

Here is an exemple where i would like to put labels at the end for the green serie, and in the middle for the purple serie.

Thanks !

Chart

asked on 20 Feb 2024

1 answer

61 views

Xamarin Telerik LineSeries Charts view error on IPhone

Hi Support Team,

I have an Xamarin application, and I using LineSeries chart.

One chart field contain more chart.

My issue, that on IPhone the charts don' work good, the stroks colors don't realy colors, I setting other colors.
If I switch off the chart, I set color is transparent, don' other possible.

I can't switch off my chart, there is non "IsVisible" property!

In Android system chart all right working.

Wat is solution?

Best Regards,

Sandor Sapi

Chart

Chart - Xamarin.iOS

answered on 19 Feb 2024

1 answer

47 views

RadBusyIndicator - maintain ScrollView Y position.

Hi,

I have a problem, with maintaining ScrollY position of ScrollView after RadBusyIndicator gets disabled:

I have following XAML structure:

    <telerik:RadBusyIndicator>
        <telerik:RadBusyIndicator.Content>
            <ScrollView>
                <StackLayout>
                    .....
                </StackLayout>
           </ScrollView>
        </telerik:RadBusyIndicator.Content>
    </telerik:RadBusyIndicator>

At the very end of StackLayout I have a button that triggers some action and RadBusyIndicator needs to be shown, but when RadBusyIndicator gets Disabled (IsBussy = false) ScrollView go to the very top without triggering Scrolled event in ScrollView.

How to persist scroll position when using RadBusyIndicator ?

BusyIndicator

answered on 19 Feb 2024

0 answers

32 views

Telerik Xamarin LineSeries Chart release error

Hi Team,

I have an Issue. I build an application with Telerik Chart component, but in case of release version (aapt bound) the chart x and y axis data label lost.
Please help if anyone konw solutions.

Best Regards,

Sandor Sapi from Hungary

Chart

Chart - Xamarin.Android

asked on 08 Feb 2024

1 answer

53 views

Not able to apply DarkTheme colors in RadComboBox in Xamarin Android

Not able to apply DarkTheme colors in RadComboBox in Xamarin Android. Please help

ComboBox

answered on 23 Jan 2024

0 answers

55 views

locate element in group radlist

How i change all checkbox values to true from an event ??

<telerikDataControls:RadListView x:Name="InstructionsList"
                                                            IsPullToRefreshActive="False"
                                                            IsPullToRefreshEnabled="False" 
                                                            BackgroundColor="Transparent"
                                                                     VerticalScrollBarVisibility="Always"
                                                                     
                                                            GroupHeaderTapped="InstructionsList_GroupHeaderTapped"
                                                            NativeControlLoaded="InstructionsList_NativeControlLoaded">
                                      
                                        
                                        <telerikDataControls:RadListView.GroupDescriptors>
                                            <telerikListView:PropertyGroupDescriptor PropertyName="GroupDesc"/>
                                        </telerikDataControls:RadListView.GroupDescriptors>
                                        
                                        <telerikDataControls:RadListView.GroupHeaderTemplate>
                                            <DataTemplate>
                                                <Grid>
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="Auto" />
                                                        <ColumnDefinition Width="*" />
                                                        <ColumnDefinition Width="Auto" />
                                                    </Grid.ColumnDefinitions>
                                                    <Label Text="&#x25B8;" Grid.Column="2" Margin="8, 12, 0, 6" FontSize="50" TextColor="{Binding ., Converter={StaticResource EndInstructionsTabGroupHeaderColorConverter}}">
                                                            <Label.Triggers>
                                                                <DataTrigger TargetType="Label" Binding="{Binding IsExpanded}" Value="True">
                                                        <Setter Property="Text" Value="&#x25BE;" />
                                                        </DataTrigger>
                                                        </Label.Triggers>
                                                    </Label>
                                                    <Label Text="{Binding Key}" Grid.Column="1" TextColor="DarkGray" FontAttributes="Bold" VerticalOptions="Center" HorizontalOptions="StartAndExpand" Margin="0,0,0,10" FontSize="18">
                                                        <Label.GestureRecognizers>
                                                        <TapGestureRecognizer Tapped="OnInstructionGroupHeaderDoubleTap" NumberOfTapsRequired="2" CommandParameter="{Binding .}"/>
                                                        </Label.GestureRecognizers>
                                                    </Label>
                                                    <CheckBox x:Name ="ActionCheckBox" IsChecked="{Binding ., Converter={local:EndInstructionsTabGroupHeaderCheckBoxCheckStateConverter}}" CheckedChanged="TaskInstructionGroupItemCheckBox_CheckedChanged" Grid.Column="0" VerticalOptions="Center" HorizontalOptions="End" Color="DarkGray"/>
                                                </Grid>
                                            </DataTemplate>
                                        </telerikDataControls:RadListView.GroupHeaderTemplate>
                                        
                                        <telerikDataControls:RadListView.ItemTemplate>
                                            <DataTemplate>
                                                <telerikListView:ListViewTemplateCell>
                                                    <telerikListView:ListViewTemplateCell.View>
                                                        <telerikPrimitives:RadBorder BackgroundColor="LightBlue" Margin="5" CornerRadius="18" BorderColor="Black">
                                                            <StackLayout Orientation="Horizontal" Style="{StaticResource ListItem}" Padding="0">
                                                                <StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand" Spacing="0" Padding="0, 5">
                                                                    <StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand" Spacing="5" Padding="5">
 
                                                                        <StackLayout Orientation="Vertical" Margin="0,15,0,0" IsVisible="{Binding isTopListGeneralItem}">
 
                                                                            <Label IsVisible="{Binding isLabelVisible}" Text="{Binding Description}"  FontSize="16"/>
                                                                            
                                                                            <Frame Padding="0"
                                                                                   CornerRadius="5"
                                                                                   HorizontalOptions="FillAndExpand"
                                                                                   BackgroundColor="White"
                                                                                   IsVisible="{Binding isEntryVisible}">
                                                                                <tools:SelectableEntry TextColor="{StaticResource LightBlueColor}"
                                                                                   Text="{Binding Value}"
                                                                                   Keyboard="{Binding KeyboardTypeBasedOnTaskActionResultType}"
                                                                                   TextChanged= "SelectableEntry_TextChanged"
                                                                                   HorizontalOptions="FillAndExpand"
                                                                                   HorizontalTextAlignment="Start"
                                                                                   ReturnType="Done"
                                                                                   VerticalOptions="Center"
                                                                                />
                                                                            </Frame>
 
                                                                            <Picker
                                                                                IsVisible="{Binding isBooleanEntryVisible}"
                                                                                SelectedIndexChanged="Picker_SelectedIndexChanged"
                                                                                BackgroundColor="White"
                                                                                SelectedItem="{Binding Value}"
                                                                            >
                                                                                <Picker.ItemsSource>
                                                                                    <x:Array Type="{x:Type x:String}">
                                                                                        <x:String>True</x:String>
                                                                                        <x:String>False</x:String>
                                                                                    </x:Array>
                                                                                </Picker.ItemsSource>
                                                                            </Picker>
 
                                                                            <Picker
                                                                                IsVisible="{Binding isLookupTaskActionResult}"
                                                                                SelectedIndexChanged="TaskActionResultLookupValuePicker_SelectedIndexChanged"
                                                                                ItemsSource="{Binding TaskInstructionResultLookupValues}"
                                                                                ItemDisplayBinding="{Binding Value}"
                                                                                BackgroundColor="White"
                                                                                SelectedItem="{Binding TaskInstructionResultLookupValueSelectedItemBinding}"/>
 
                                                                            <Label Text="{x:Static resx:Resources.Observations}" FontSize="16" />
                                                                            
                                                                            <Frame Padding="0" CornerRadius="5" IsClippedToBounds="true" HorizontalOptions="FillAndExpand">
                                                                                <tools:SelectableEntry TextColor="Black"
                                                                                    HorizontalOptions="FillAndExpand"
                                                                                    HorizontalTextAlignment="Start"
                                                                                    VerticalOptions="Center"
                                                                                    Text="{Binding CommentsOfParentInstruction}"
                                                                                    ReturnType="Done"
                                                                                />
                                                                            </Frame>
                                                                            
                                                                            <StackLayout x:Name="EstimatedTime" Orientation="Horizontal">
                                                                                <Label Text="{x:Static resx:Resources.EstimatedTime}" Style="{StaticResource Info}" TextColor="Gray" FontSize="12" />
                                                                                <Label Text="{Binding EstimatedDurationOfParentInstruction}" Style="{StaticResource Info}" TextColor="Gray" FontSize="12" />
                                                                            </StackLayout>
                                                                            
                                                                        </StackLayout>
 
                                                                        <StackLayout IsVisible="{Binding isMeasure}">
                                                                            <Label Text="{Binding Description}" Style="{StaticResource MeasureListHeader}" />
                                                                        
                                                                            <StackLayout Orientation="Horizontal">
                                                                                <Label Text="{x:Static resx:Resources.Counterlbl}" Style="{StaticResource MeasureListDetail}" />
                                                                                <Label Text="{Binding MeasurementCounter}" Style="{StaticResource MeasureListDetail}" />
                                                                            </StackLayout>
                                                                    
                                                                            <StackLayout Orientation="Horizontal">
                                                                                <Label Text="{Binding Remarks}" Style="{StaticResource MeasureListDetail}" />
                                                                            </StackLayout>
                                                                        
                                                                            <StackLayout Orientation="Horizontal" HorizontalOptions="FillAndExpand" Padding="0, 0, 5, 0">
                                                                                <Frame Padding="0" CornerRadius="5" IsClippedToBounds="true" HorizontalOptions="FillAndExpand">
                                                                                    <tools:SelectableEntry TextColor="{StaticResource LightBlueColor}"
                                                                                                           Text="{Binding Value}"
                                                                                                           Keyboard="Numeric"
                                                                                                           IsVisible="{Binding isMeasure}"
                                                                                                           HorizontalOptions="FillAndExpand"
                                                                                                           HorizontalTextAlignment="center"
                                                                                                           VerticalOptions="Center" />
                                                                                </Frame>
                                                                                <Label Text="{Binding MeasurementUnit}" Style="{StaticResource MeasureListDetail}" VerticalOptions="Center" HorizontalOptions="End" />
                                                                            </StackLayout>
                                                                        </StackLayout>
                                                                        
                                                                    </StackLayout>
                                                                </StackLayout>
                                                            </StackLayout>
                                                        </telerikPrimitives:RadBorder>
                                                    </telerikListView:ListViewTemplateCell.View>
                                                </telerikListView:ListViewTemplateCell>
                                            </DataTemplate>
                                        </telerikDataControls:RadListView.ItemTemplate>
                                    </telerikDataControls:RadListView>

ListView

asked on 15 Jan 2024

1 answer

54 views

AutoCompleteView - ShowSuggestions used from Focused and TextChanged events is misbehaving

Hi,

I need to show suggestios when user focues on control or deletes text completely but this is not working as expected. My custom filter function already retruns data properly for empty search strings.

This is my TextCahnged event implemtation:

        private void usersAutoCompleteView_TextChanged(object sender, TextChangedEventArgs e)
        {
            var control = (RadAutoCompleteView)sender;
            if (string.IsNullOrEmpty(e.NewTextValue) && !string.IsNullOrEmpty(e.OldTextValue))
            {
                control.ShowSuggestions();
            }
        }

And this is my Focused event implementation:

        private void usersAutoCompleteView_Focused(object sender, FocusEventArgs e)
        {
            var control = (RadAutoCompleteView)sender;
            if (string.IsNullOrEmpty(control.SearchText))
            {
                control.ShowSuggestions();
            }
        }

I am also using SuggestionItemSelected event but is really simple:

      private void usersAutoCompleteView_SuggestionItemSelected(object sender, Telerik.XamarinForms.Input.AutoComplete.SuggestionItemSelectedEventArgs e)
      {
          MyUser = (e.DataItem as MyModel).User;
      }

If I use Focused for showing Suggestions everything works fine, but when I added TextChanged nothings works as shoud:

1) Suggestion menu is never shown from TextChanged event

2) When I select Item from Suggsetion menu, text on the control gets immediately deleted (Text changed is getting called again with empty NewTextValue)

3) When I remove usage for TextChanged event misbehaviour is still there. I need to clean whole build/restart VS/emulator to get it running again.

How should I achieve this functionality? It should be simple, for me it's looks like a common scenario

AutoCompleteView

answered on 08 Jan 2024