Navigate through views using SlideView indicators

Environment

Product Version 2019.3.1023.1
Product SlideView for Xamarin.Forms

Description

The purpose of this help article is to show you how to navigate through the SlideView views / pages using the indicators.

Solution

This scenario could be achieved using the SlideView Control Template. Then you need to attach a gesture recognizer to the Indicator Template. As a next step inside the TappedEvent you need to implement a custom logic to get the current atapped indicator and set it to the SlideView SelectedIndex.

  1. Add the SlideView ControlTemplate to the page's resources:
<ContentPage.Resources>
    <ResourceDictionary>
        <ControlTemplate x:Key="RadSlideView_IndicatorTemplate">
            <Label Text="{TemplateBinding IndicatorText}"
                    FontSize="{TemplateBinding IndicatorFontSize}"
                    FontFamily="{TemplateBinding IndicatorFontFamily}"
                    VerticalOptions="Center"
                    TextColor="{TemplateBinding IndicatorColor}">
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Tapped="IndicatorTapped" NumberOfTapsRequired="1"/>
                </Label.GestureRecognizers>
            </Label>
        </ControlTemplate>

        <ControlTemplate x:Key="RadSlideView_SelectedIndicatorTemplate">
            <Label Text="{TemplateBinding SelectedIndicatorText}"
                    FontSize="{TemplateBinding SelectedIndicatorFontSize}"
                    FontFamily="{TemplateBinding SelectedIndicatorFontFamily}"
                    VerticalOptions="Center"
                    TextColor="{TemplateBinding SelectedIndicatorColor}" />
        </ControlTemplate>
        <ControlTemplate x:Key="RadSlideView_ControlTemplate">
            <Grid>
                <ContentPresenter AutomationId="SlideViewContentPresenter"/>

                <Label AutomationId="SlideViewLeftArrow" VerticalOptions="Center"
                        IsVisible="{TemplateBinding ShowButtons}"
                        Text="&#x2039;"
                        FontSize="{TemplateBinding SlideButtonsSize}"
                        FontFamily="Arial"
                        HorizontalOptions="Start"
                        TextColor="{TemplateBinding SlideButtonsColor}">
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Command="{TemplateBinding Path=PreviousItemCommand}"/>
                    </Label.GestureRecognizers>
                </Label>

                <Label AutomationId="SlideViewRightArrow"    
                        VerticalOptions="Center" 
                        Text="&#x203A;" 
                        IsVisible="{TemplateBinding ShowButtons}"
                        FontSize="{TemplateBinding SlideButtonsSize}"
                        FontFamily="Arial"
                        HorizontalOptions="End"
                        TextColor="{TemplateBinding SlideButtonsColor}">
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Command="{TemplateBinding Path=NextItemCommand}"/>
                    </Label.GestureRecognizers>
                    <AutomationProperties.HelpText>
                        <OnPlatform x:TypeArguments="x:String">
                            <On Platform="iOS" Value="Navigate Forward" />
                            <On Platform="UWP" Value="Navigate Forward" />
                        </OnPlatform>
                    </AutomationProperties.HelpText>
                    <AutomationProperties.Name>
                        <OnPlatform x:TypeArguments="x:String">
                            <On Platform="iOS" Value="RadSlideView" />
                            <On Platform="UWP" Value="RadSlideView" />
                        </OnPlatform>
                    </AutomationProperties.Name>
                </Label>

                <slideView:SlideViewIndicators Owner="{TemplateBinding}"
                                                Spacing="{TemplateBinding Path=IndicatorsSpacing}"
                                                SelectedIndicatorTemplate="{TemplateBinding SelectedIndicatorTemplate}"
                                                IndicatorTemplate="{TemplateBinding IndicatorTemplate}"
                                                IsVisible="{TemplateBinding ShowIndicators}"
                                                VerticalOptions="End"
                                                HorizontalOptions="Center"/>
            </Grid>
        </ControlTemplate>
    </ResourceDictionary>
</ContentPage.Resources>
  1. Here is a sample SlideView definition:
<StackLayout>
    <telerikPrimitives:RadSlideView x:Name="slideView"
                                    ControlTemplate="{StaticResource RadSlideView_ControlTemplate}"
                                    IndicatorTemplate="{StaticResource RadSlideView_IndicatorTemplate}"
                                    SelectedIndicatorTemplate="{StaticResource RadSlideView_SelectedIndicatorTemplate}">
        <telerikPrimitives:RadSlideView.ItemsSource>
            <x:Array Type="{x:Type ContentView}">
                <ContentView>
                    <Grid HeightRequest="100">
                        <Label Text="View 1" />
                    </Grid>
                </ContentView>
                <ContentView>
                    <Label Text="View 2" />
                </ContentView>
                <ContentView >
                    <Label Text="View 3" />
                </ContentView>
                <ContentView >
                    <Label Text="View 4" />
                </ContentView>
                <ContentView >
                    <Label Text="View 5" />
                </ContentView>
            </x:Array>
        </telerikPrimitives:RadSlideView.ItemsSource>
    </telerikPrimitives:RadSlideView>
</StackLayout>
  1. And the custom implementation inside the IndicatorTapped event:
private void IndicatorTapped(object sender, System.EventArgs e)
{
    var slideViewIndicator = ((Label)sender).Parent as ContentView;
    if (slideViewIndicator != null)
    {
        var panel = slideViewIndicator.Parent as StackLayout;
        if (panel != null)
        {
            var tappedIndex = panel.Children.IndexOf(slideViewIndicator);
            this.slideView.SelectedIndex = tappedIndex;
        }
    }
}
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