Hello. I am using a RadCartesianChartView with CartesianGridLineAnnotations set on the Y axis. When zooming and panning the chart, the annotations get rendered below the X axis, both the labels and the strokes. I've attached 2 screenshots to demonstrate the effect. Is there a property that we can change to prevent the annotations from going below the X axis? 

Thank you.

I want to bind a command to the closed event of the sidedrawer. I added a command property "SettingsClosedCommand" to the viewmodel.
I added this namespace to the xaml:

xmlns:drawer="clr-namespace:Telerik.XamarinForms.Primitives.SideDrawer;assembly=Telerik.XamarinForms.Primitives"

And I added the 3 middle lines of code to the sidedrawer:

<telerikPrimitives:RadSideDrawer DrawerLength="180" DrawerLocation="Top" DrawerTransitionType="SlideInOnTop"  IsOpen="{Binding AreSettingsOpen, Mode=TwoWay}" >

  <telerikPrimitives:RadSideDrawer.Commands>

    <drawer:SideDrawerUserCommand Command="{Binding SettingsClosedCommand}" Id="Closed"/>

  </telerikPrimitives:RadSideDrawer.Commands>  

<telerikPrimitives:RadSideDrawer.MainContent>

etc..

When I try to compile I get this error:

SeverityCodeDescriptionProjectFileLineSuppression State ErrorObject reference not set to an instance of an object.

I found the information here. What am I missing here? Is the namespace correct because it is not mentioned in the article?

Telerik Support,

It seems when you have an ObservableCollection set as the ItemsSource of a RadListView, the RadListView does not like when you set an item in the ObservableCollection using the index of the item.

ex. 

ObCollection[i] = newObject;

I get the following exception:

This convention is used in WPF/Silverlight to keep a bound collection control ordered correctly instead of removing the item and re-adding it.  Should I not be doing it this way in Xamarin?

Please let me know if you need any further information, I am using Telerik For Xamarin 2017 R1 (2017.1.10120.233).

Thanks!

Our customer woud like to have normal ListView items with black text on a white background, and selected items with white text on a green background.

I can't see a way of setting the TextColor for the SelectedItemStyle. Is this possible? If not, is there another way of achieving this?

Hi,

i am showing a RadCartesianChartView with a DateTimeContinuousAxis for OX and a LinearAxis for OY. The OX is showing shorter or longer spans of time, depending on the user's choice.

1. Zoom

I want to set the chart zoom level from the moment i display the chart, but also allow the user to manually zoom and pan. I tried to use Chart.SetZoom() and also add ChartPanAndZoomBehavior(), but it doesn't work. If i set the Zoom factor, the user cannot manually pan and zoom. I also tried ChartPanAndZoomBehavior.SetZoomToChart() but has no effect.

2. Setting DateTimeContinuousAxis MajorStep

When the user selects a smaller time interval (like 1 month), i want the OX axis to show days, but not all 30 days. So i set the MajorStepUnit to TimeInterval.Day and the MajorStep to 10. However, it doesn't work as expected - i see a tick for every 5 days. Worse, when the user manually zooms on the chart, the tick interval is automatically changed. I can obtain a better result by setting the horizontalAxis.MaximumTicks, but i get other side effects. What can i do to have more control over the labels that are displayed in the OX axis?

Thank you!

I am using the mvvm pattern and would like to bind the SideDrawer "IsOpen" property.

I have created a boolean property that raises property changed event and bind to it. With a button I change this property to the opposite value. Initially I set it to true and when the screen opens the sidedrawer is visible like expected. When I hit the button the bound property is changed but it has no effect on the visibility of the sidedrawer? Also when I close the drawer by sliding it down It does not change the bound property? I would expect that it changes to false when I do this.

What am I missing here? Is "IsOpen" a bindable property?

vm (using freshmvvm):

public bool SettingsVisible

{     

    get     

       {         

           return _settingsVisible;     

       }     

      set    

     {        

         _settingsVisible = value;

        RaisePropertyChanged("SettingsVisible");

    }

}

SettingsCommand = new Command(SettingsHit); //bound to button command to show/hide sidedrawer

public void SettingsHit() {     SettingsVisible = !SettingsVisible; }

xaml:

  <telerikPrimitives:RadSideDrawer x:Name="drawer" DrawerLength="200" DrawerLocation="Bottom" DrawerTransitionType="SlideInOnTop"                                   DrawerTransitionFadeOpacity="0.5" IsOpen="{Binding SettingsVisible}">    

<telerikPrimitives:RadSideDrawer.MainContent> 

etc....

Hello,

How can I format the entered/showed  numbers in DecimalEditor.

Thanks

Hello to everybody. 

I don't know if you are experiencing any problems with the installer...

I'm using VS 2017 with the latest update. The problem is that when I try to install this version, it says that it's necessary to install Visual Studio with Xamarin Extensions first. It's really annoying...

Anyone has this problem? Thanks to everyone. 

Hi,

in our Xamarin-Forms Project, I use a Telerik ListView (LinearLayout) with swiping. For some cells, i want to disable swiping. In your manual [1] i read, that by setting the Cancel-property of the ItemSwipeStartingEventArgs to false in the StartSwiping-Event:

public void OnItemSwipeStarting(object sender, ItemSwipeStartingEventArgs e)

{

    var swipedItem = e.Item as OurItem;

   if (swipedItem.HasACertainProperty == true)

   {

        // For some items, we want to "disable" the swiping

         e.Cancel = false;    

    }

}

This does not work, but when i set e.Cancel to true, then

in iOS - swiping is disabled as expected.

in Android - we get a NullPointerException: (Java.Lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Rect.height()' on a null object reference)

in UWP - the CellContent disapears and never comes back again :'-(

The question is: is it possible to "disable" swiping for some cells in the Telerik ListView? If the answer is yes, how could I do this?

Thank you very much in advance.

All the best,

Ivo

[1] http://docs.telerik.com/devtools/xamarin/controls/listview/gestures/listview-gestures-cell-swipe