Calendar [iOS]: ScrollAppointmentIntoView() Doesn't Scroll

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Last Updated: 23 Jul 2019 05:09 by ADMIN

Release 2019.2.708 (R2 2019 minor release)

IanV

Created on: 02 Jan 2019 01:28

Category: Calendar & Scheduling

Type: Bug Report

Calendar [iOS]: ScrollAppointmentIntoView() Doesn't Scroll

In Xamarin Forms.

When I call Calendar.ScrollAppointmentIntoView(theItem); in Android it works fine.

In iOS when the same call is made, the calendar scrolls about 1 pixel, then stops.

I put the call into a timer just to make sure it's there.

Device.StartTimer(TimeSpan.FromMilliseconds(3000), () =>

{ Device.BeginInvokeOnMainThread(() => { Calendar.ScrollAppointmentIntoView(theItem); });

return false; // True = Repeat again, False = Stop the timer

});

3 comments

ADMIN

Lance | Senior Manager Technical Support

Posted on: 02 Jan 2019 18:06

Hi Ian,

Thank you for the code, I can replicate the issue and converted this thread to a Bug Report. The development team will review this soon and update the status of the case. You have been subscribed to the issue and will get a notification when the development team updates the issue's status.

Unfortunately, I do not have a suitable workaround at this time. I apologize for any inconvenience this may cause while we work towards a solution.

Reproducible

View

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"

xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

xmlns:local="clr-namespace:ScrollIntoViewTest.Portable"

xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"

x:Class="ScrollIntoViewTest.Portable.MainPage">

<ContentPage.BindingContext>

<local:ViewModel x:Name="PageViewModel"/>

</ContentPage.BindingContext>

<Grid>

<Grid.RowDefinitions>

<RowDefinition Height="*" />

<RowDefinition Height="Auto" />

</Grid.RowDefinitions>

<telerikInput:RadCalendar x:Name="calendar" NativeControlLoaded="CalendarLoaded" AppointmentsSource="{Binding Items}">

<telerikInput:RadCalendar.DayViewStyle>

<telerikInput:DayViewStyle AllDayAppointmentBackgroundColor="Blue" AllDayAppointmentTextColor="White" AllDayAppointmentFontSize="12" TimelineLabelsTextColor="DarkGray" TimelineLabelsFontSize="10" AppointmentFontSize="12" AppointmentDetailsFontSize="10" />

</telerikInput:RadCalendar.DayViewStyle>

</telerikInput:RadCalendar>

<Button Grid.Row="1" Text="Scroll To Appointment" Margin="5" Clicked="Button_OnClicked"/>

</Grid>

</ContentPage>

Code behind and View Model

using System;

using System.Collections.ObjectModel;

using System.Linq;

using Telerik.XamarinForms.Input;

using Xamarin.Forms;

namespace ScrollIntoViewTest.Portable

{

public partial class MainPage : ContentPage

{

public MainPage()

{

InitializeComponent();

}

private void CalendarLoaded(object sender, EventArgs e)

{

(sender as RadCalendar).TrySetViewMode(CalendarViewMode.MultiDay);

}

private void Button_OnClicked(object sender, EventArgs e)

{

calendar.ScrollAppointmentIntoView(PageViewModel.Items.LastOrDefault());

}

public class ViewModel

{

public ViewModel()

{

Items = new ObservableCollection<IAppointment>(Enumerable.Range(1,10).Select(i => new Appointment

{

StartDate = DateTime.Now.AddHours(-i - 1),

EndDate = DateTime.Now.AddHours(-i),

Title = $"Item {i}",

Detail = $"This is appointment for item {i}."

}));

}

public ObservableCollection<IAppointment> Items { get; set; }

}

public class Appointment : IAppointment

{

public DateTime StartDate { get; set; }

public DateTime EndDate { get; set; }

public string Title { get; set; }

public Color Color { get; set; }

public bool IsAllDay { get; set; }

public string Detail { get; set; }

}

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik

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IanV

Posted on: 02 Jan 2019 16:15

Xamarin Forms 3.4, Telerik newest as of today

IAppointment objects (as is)

XAML:

[REDACTED BY TELERIK SUPPORT]

<input:RadCalendar x:Name="calendar" IsVisible="{Binding IsLoading, Converter={StaticResource NegateBooleanConverter}}" NativeControlLoaded="CalendarLoaded" AppointmentTapped="Calendar_OnAppointmentTapped" SelectionChanged="Calendar_OnSelectionChanged" DisplayDateChanged="Calendar_OnDisplayDateChanged" ViewChanged="Calendar_OnViewChanged" AppointmentsSource="{Binding Items}"> <input:RadCalendar.DayViewStyle><input:DayViewStyle AllDayAppointmentBackgroundColor="Blue" AllDayAppointmentTextColor="White" AllDayAppointmentFontSize="12" TimelineLabelsTextColor="DarkGray" TimelineLabelsFontSize="10" AppointmentFontSize="12" AppointmentDetailsFontSize="10"/></input:RadCalendar.DayViewStyle></input:RadCalendar>

[REDACTED BY TELERIK SUPPORT]

ADMIN

Lance | Senior Manager Technical Support

Posted on: 02 Jan 2019 13:30

Hi Ian,

In order for me to investigate this further, can you please reply with the following information:

- What is the Xamarin.Forms version?
- What is the Telerik UI for Xamarin version?
- Please share the code for that page/view, I'll particularly need to see the Calendar's parental structure
- One example of the appointment object that you use.

OR

- Reply with a demo project that reproduces the problem, this will answer all the above questions at once. (Note: since this is a forum thread, you'll need to put the project somewhere like OneDrive/Dropbox and share a link for me to download it)

Next Steps

With this information, I'll attempt to reproduce the problem in an isolated project and escalate to the development team.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik