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using System.ComponentModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
public class EditorRenderer : ViewRenderer<Editor, FormsTextBox>
{
bool _fontApplied;
Brush _backgroundColorFocusedDefaultBrush;
protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
{
if (e.NewElement != null)
{
if (Control == null)
{
var textBox = new FormsTextBox
{
AcceptsReturn = true,
TextWrapping = TextWrapping.Wrap,
Style = Windows.UI.Xaml.Application.Current.Resources["FormsTextBoxStyle"] as Windows.UI.Xaml.Style
};
SetNativeControl(textBox);
textBox.TextChanged += OnNativeTextChanged;
textBox.LostFocus += OnLostFocus;
}
UpdateText();
UpdateInputScope();
UpdateTextColor();
UpdateFont();
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (disposing && Control != null)
{
Control.TextChanged -= OnNativeTextChanged;
Control.LostFocus -= OnLostFocus;
}
base.Dispose(disposing);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Editor.TextColorProperty.PropertyName)
{
UpdateTextColor();
}
else if (e.PropertyName == Editor.FontAttributesProperty.PropertyName)
{
UpdateFont();
}
else if (e.PropertyName == Editor.FontFamilyProperty.PropertyName)
{
UpdateFont();
}
else if (e.PropertyName == Editor.FontSizeProperty.PropertyName)
{
UpdateFont();
}
else if (e.PropertyName == Editor.TextProperty.PropertyName)
{
UpdateText();
}
}
void OnLostFocus(object sender, RoutedEventArgs e)
{
Element.SendCompleted();
}
protected override void UpdateBackgroundColor()
{
base.UpdateBackgroundColor();
if (Control == null)
{
return;
}
// By default some platforms have alternate default background colors when focused
BrushHelpers.UpdateColor(Element.BackgroundColor, ref _backgroundColorFocusedDefaultBrush,
() => Control.BackgroundFocusBrush, brush => Control.BackgroundFocusBrush = brush);
}
void OnNativeTextChanged(object sender, Windows.UI.Xaml.Controls.TextChangedEventArgs args)
{
Element.SetValueCore(Editor.TextProperty, Control.Text);
}
void UpdateFont()
{
if (Control == null)
return;
Editor editor = Element;
if (editor == null)
return;
bool editorIsDefault = editor.FontFamily == null && editor.FontSize == Device.GetNamedSize(NamedSize.Default, typeof(Editor), true) && editor.FontAttributes == FontAttributes.None;
if (editorIsDefault && !_fontApplied)
return;
if (editorIsDefault)
{
// ReSharper disable AccessToStaticMemberViaDerivedType
// Resharper wants to simplify 'TextBox' to 'Control', but then it'll conflict with the property 'Control'
Control.ClearValue(TextBox.FontStyleProperty);
Control.ClearValue(TextBox.FontSizeProperty);
Control.ClearValue(TextBox.FontFamilyProperty);
Control.ClearValue(TextBox.FontWeightProperty);
Control.ClearValue(TextBox.FontStretchProperty);
// ReSharper restore AccessToStaticMemberViaDerivedType
}
else
{
Control.ApplyFont(editor);
}
_fontApplied = true;
}
void UpdateInputScope()
{
var custom = Element.Keyboard as CustomKeyboard;
if (custom != null)
{
Control.IsTextPredictionEnabled = (custom.Flags & KeyboardFlags.Suggestions) != 0;
Control.IsSpellCheckEnabled = (custom.Flags & KeyboardFlags.Spellcheck) != 0;
}
else
{
Control.ClearValue(TextBox.IsTextPredictionEnabledProperty);
Control.ClearValue(TextBox.IsSpellCheckEnabledProperty);
}
Control.InputScope = Element.Keyboard.ToInputScope();
}
void UpdateText()
{
string newText = Element.Text ?? "";
if (Control.Text == newText)
{
return;
}
Control.Text = newText;
Control.SelectionStart = Control.Text.Length;
}
void UpdateTextColor()
{
Color textColor = Element.TextColor;
if (textColor.IsDefault || !Element.IsEnabled)
{
// ReSharper disable once AccessToStaticMemberViaDerivedType
Control.ClearValue(TextBox.ForegroundProperty);
}
else
{
Control.Foreground = textColor.ToBrush();
}
}
}
}
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