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<ContentPage ...
    xmlns:effects="clr-namespace:<project>.Effects;assembly=<project>"
    BackgroundColor="PaleTurquoise">

    <ContentPage.Resources>
        <ResourceDictionary>
            <x:Int32 x:Key="SmallCornerRadius">4</x:Int32>
            <x:Int32 x:Key="MediumCornerRadius">8</x:Int32>
            <x:Int32 x:Key="LargeCornerRadius">16</x:Int32>
        </ResourceDictionary>

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namespace <project>.Controls
{
    public class SelectableLabel : Editor
    {
        public SelectableLabel()
        {
        }
    }
}

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namespace <project>.Droid.Controls
{
    public class CustomEditText : FormsEditText
    {
        public CustomEditText(Context context) : base(context)
        {
        }

        protected override void OnAttachedToWindow()
        {

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[assembly: ExportRenderer(typeof(SelectableLabel), typeof(SelectableLabelRenderer))]

namespace <project>.Droid.Controls
{
    public class SelectableLabelRenderer : EditorRenderer
    {
        public SelectableLabelRenderer(Context context) : base(context)
        {
        }

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[assembly: ExportRenderer(typeof(SelectableLabel), typeof(SelectableLabelRenderer))]

namespace <project>.iOS.Controls
{
    public class SelectableLabelRenderer : EditorRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
        {
            base.OnElementChanged(e);

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protected override FormsEditText CreateNativeControl() =>
    new CustomEditText(Context);

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public class CustomSelectionActionModeCallback implements ActionMode.Callback {
    
    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        return true;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        try {

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editText.setCustomSelectionActionModeCallback(new CustomSelectionActionModeCallback());

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public class CustomInsertionActionModeCallback implements ActionMode.Callback {

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        return false;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false;

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editText.setCustomInsertionActionModeCallback(new CustomInsertionActionModeCallback());