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using System;
using System.ComponentModel;
using AppKit;
namespace Xamarin.Forms.Platform.MacOS
{
public class EntryRenderer : ViewRenderer<Entry, NSTextField>
{
class BoolEventArgs : EventArgs
{
public BoolEventArgs(bool value)
{
Value = value;
}
public bool Value
{
get;
private set;
}
}
class FormsNSTextField : NSTextField
{
public EventHandler<BoolEventArgs> FocusChanged;
public override bool ResignFirstResponder()
{
FocusChanged?.Invoke(this, new BoolEventArgs(false));
return base.ResignFirstResponder();
}
public override bool BecomeFirstResponder()
{
FocusChanged?.Invoke(this, new BoolEventArgs(true));
return base.BecomeFirstResponder();
}
}
bool _disposed;
NSColor _defaultTextColor;
IElementController ElementController => Element;
IEntryController EntryController => Element;
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (Control == null)
{
NSTextField textField;
if (e.NewElement.IsPassword)
textField = new NSSecureTextField();
else
{
textField = new FormsNSTextField();
(textField as FormsNSTextField).FocusChanged += TextFieldFocusChanged;
}
SetNativeControl(textField);
_defaultTextColor = textField.TextColor;
textField.Changed += OnChanged;
textField.EditingBegan += OnEditingBegan;
textField.EditingEnded += OnEditingEnded;
}
if (e.NewElement != null)
{
UpdatePlaceholder();
UpdateText();
UpdateColor();
UpdateFont();
UpdateAlignment();
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == Entry.PlaceholderProperty.PropertyName ||
e.PropertyName == Entry.PlaceholderColorProperty.PropertyName)
UpdatePlaceholder();
else if (e.PropertyName == Entry.IsPasswordProperty.PropertyName)
UpdatePassword();
else if (e.PropertyName == Entry.TextProperty.PropertyName)
UpdateText();
else if (e.PropertyName == Entry.TextColorProperty.PropertyName)
UpdateColor();
else if (e.PropertyName == Entry.HorizontalTextAlignmentProperty.PropertyName)
UpdateAlignment();
else if (e.PropertyName == Entry.FontAttributesProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == Entry.FontFamilyProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == Entry.FontSizeProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == VisualElement.IsEnabledProperty.PropertyName)
{
UpdateColor();
UpdatePlaceholder();
}
base.OnElementPropertyChanged(sender, e);
}
protected override void SetBackgroundColor(Color color)
{
if (Control == null)
return;
Control.BackgroundColor = color == Color.Default ? NSColor.Clear : color.ToNSColor();
base.SetBackgroundColor(color);
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
_disposed = true;
if (Control != null)
{
Control.EditingBegan -= OnEditingBegan;
Control.Changed -= OnChanged;
Control.EditingEnded -= OnEditingEnded;
var formsNSTextField = (Control as FormsNSTextField);
if (formsNSTextField != null)
formsNSTextField.FocusChanged -= TextFieldFocusChanged;
}
}
base.Dispose(disposing);
}
void TextFieldFocusChanged(object sender, BoolEventArgs e)
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, e.Value);
}
void OnEditingBegan(object sender, EventArgs e)
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
}
void OnChanged(object sender, EventArgs eventArgs)
{
ElementController.SetValueFromRenderer(Entry.TextProperty, Control.StringValue);
}
void OnEditingEnded(object sender, EventArgs e)
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
EntryController?.SendCompleted();
}
void UpdateAlignment()
{
Control.Alignment = Element.HorizontalTextAlignment.ToNativeTextAlignment();
}
void UpdateColor()
{
var textColor = Element.TextColor;
if (textColor.IsDefault || !Element.IsEnabled)
Control.TextColor = _defaultTextColor;
else
Control.TextColor = textColor.ToNSColor();
}
void UpdatePassword()
{
if (Element.IsPassword && (Control is NSSecureTextField))
return;
if (!Element.IsPassword && !(Control is NSSecureTextField))
return;
}
void UpdateFont()
{
Control.Font = Element.ToNSFont();
}
void UpdatePlaceholder()
{
var formatted = (FormattedString)Element.Placeholder;
if (formatted == null)
return;
var targetColor = Element.PlaceholderColor;
// Placeholder default color is 70% gray
// https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UITextField_Class/index.html#//apple_ref/occ/instp/UITextField/placeholder
var color = Element.IsEnabled && !targetColor.IsDefault ? targetColor : ColorExtensions.SeventyPercentGrey.ToColor();
Control.PlaceholderAttributedString = formatted.ToAttributed(Element, color);
}
void UpdateText()
{
// ReSharper disable once RedundantCheckBeforeAssignment
if (Control.StringValue != Element.Text)
Control.StringValue = Element.Text ?? string.Empty;
}
}
}
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