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@StephaneDelcroix @hartez @paymicro @PureWeen @pauldipietro @KSemenenko @jfversluis @samhouts @Marcus-L @jimmgarrido @jassmith
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using Android.App;
using Android.Util;
using Android.Views;
using Android.Widget;
using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using Orientation = Android.Widget.Orientation;
using Android.Content;
using AColor = Android.Graphics.Color;
using Android.Text;
using Android.Text.Style;
namespace Xamarin.Forms.Platform.Android
{
public class PickerRenderer : ViewRenderer<Picker, EditText>, IPickerRenderer
{
AlertDialog _dialog;
bool _isDisposed;
TextColorSwitcher _textColorSwitcher;
int _originalHintTextColor;
EntryAccessibilityDelegate _pickerAccessibilityDelegate;
public PickerRenderer(Context context) : base(context)
{
AutoPackage = false;
}
[Obsolete("This constructor is obsolete as of version 2.5. Please use PickerRenderer(Context) instead.")]
[EditorBrowsable(EditorBrowsableState.Never)]
public PickerRenderer()
{
AutoPackage = false;
}
IElementController ElementController => Element as IElementController;
protected override void Dispose(bool disposing)
{
if (disposing && !_isDisposed)
{
_isDisposed = true;
((INotifyCollectionChanged)Element.Items).CollectionChanged -= RowsCollectionChanged;
_pickerAccessibilityDelegate?.Dispose();
_pickerAccessibilityDelegate = null;
}
base.Dispose(disposing);
}
protected override EditText CreateNativeControl()
{
return new PickerEditText(Context);
}
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
if (e.OldElement != null)
((INotifyCollectionChanged)e.OldElement.Items).CollectionChanged -= RowsCollectionChanged;
if (e.NewElement != null)
{
((INotifyCollectionChanged)e.NewElement.Items).CollectionChanged += RowsCollectionChanged;
if (Control == null)
{
var textField = CreateNativeControl();
textField.SetAccessibilityDelegate(_pickerAccessibilityDelegate = new EntryAccessibilityDelegate(Element));
var useLegacyColorManagement = e.NewElement.UseLegacyColorManagement();
_textColorSwitcher = new TextColorSwitcher(textField.TextColors, useLegacyColorManagement);
SetNativeControl(textField);
_originalHintTextColor = Control.CurrentHintTextColor;
}
UpdateFont();
UpdatePicker();
UpdateTextColor();
UpdateCharacterSpacing();
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Picker.TitleProperty.PropertyName || e.PropertyName == Picker.TitleColorProperty.PropertyName)
UpdatePicker();
else if (e.PropertyName == Picker.SelectedIndexProperty.PropertyName)
UpdatePicker();
else if (e.PropertyName == Picker.CharacterSpacingProperty.PropertyName)
UpdateCharacterSpacing();
else if (e.PropertyName == Picker.TextColorProperty.PropertyName)
UpdateTextColor();
else if (e.PropertyName == Picker.FontAttributesProperty.PropertyName || e.PropertyName == Picker.FontFamilyProperty.PropertyName || e.PropertyName == Picker.FontSizeProperty.PropertyName)
UpdateFont();
}
protected override void OnFocusChangeRequested(object sender, VisualElement.FocusRequestArgs e)
{
base.OnFocusChangeRequested(sender, e);
if (e.Focus)
CallOnClick();
else if (_dialog != null)
{
_dialog.Hide();
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
_dialog = null;
}
}
void IPickerRenderer.OnClick()
{
Picker model = Element;
if (_dialog != null)
return;
var picker = new NumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetDisplayedValues(model.Items.ToArray());
picker.WrapSelectorWheel = false;
picker.DescendantFocusability = DescendantFocusability.BlockDescendants;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context) { Orientation = Orientation.Vertical };
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
if (!Element.IsSet(Picker.TitleColorProperty))
{
builder.SetTitle(model.Title ?? "");
}
else
{
var title = new SpannableString(model.Title ?? "");
title.SetSpan(new ForegroundColorSpan(model.TitleColor.ToAndroid()), 0, title.Length(), SpanTypes.ExclusiveExclusive);
builder.SetTitle(title);
}
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
_dialog = null;
});
builder.SetPositiveButton(global::Android.Resource.String.Ok, (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
Control.Text = model.Items[Element.SelectedIndex];
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (sender, args) =>
{
ElementController?.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
_dialog?.Dispose();
_dialog = null;
};
_dialog.Show();
}
void RowsCollectionChanged(object sender, EventArgs e)
{
UpdatePicker();
}
void UpdateCharacterSpacing()
{
if (Forms.IsLollipopOrNewer)
{
Control.LetterSpacing = Element.CharacterSpacing.ToEm();
}
}
void UpdateFont()
{
Control.Typeface = Element.ToTypeface();
Control.SetTextSize(ComplexUnitType.Sp, (float)Element.FontSize);
}
void UpdatePicker()
{
Control.Hint = Element.Title;
if (Element.IsSet(Picker.TitleColorProperty))
Control.SetHintTextColor(Element.TitleColor.ToAndroid());
else
Control.SetHintTextColor(new AColor(_originalHintTextColor));
string oldText = Control.Text;
if (Element.SelectedIndex == -1 || Element.Items == null || Element.SelectedIndex >= Element.Items.Count)
Control.Text = null;
else
Control.Text = Element.Items[Element.SelectedIndex];
if (oldText != Control.Text)
((IVisualElementController)Element).NativeSizeChanged();
_pickerAccessibilityDelegate.ValueText = Control.Text;
}
void UpdateTextColor()
{
_textColorSwitcher?.UpdateTextColor(Control, Element.TextColor);
}
}
}
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