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SearchBarRenderer.cs
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using System.ComponentModel;
using System.Windows.Input;
using System.Windows.Media;
namespace Xamarin.Forms.Platform.WinPhone
{
public class SearchBarRenderer : ViewRenderer<SearchBar, FormsPhoneTextBox>
{
const string DefaultPlaceholder = "Search";
Brush _defaultPlaceholderColorBrush;
Brush _defaultTextColorBrush;
bool _fontApplied;
protected override void OnElementChanged(ElementChangedEventArgs<SearchBar> e)
{
base.OnElementChanged(e);
var scope = new InputScope();
var name = new InputScopeName();
name.NameValue = InputScopeNameValue.Search;
scope.Names.Add(name);
var phoneTextBox = new FormsPhoneTextBox { InputScope = scope };
phoneTextBox.KeyUp += PhoneTextBoxOnKeyUp;
phoneTextBox.TextChanged += PhoneTextBoxOnTextChanged;
SetNativeControl(phoneTextBox);
UpdateText();
UpdatePlaceholder();
UpdateAlignment();
UpdateFont();
UpdatePlaceholderColor();
UpdateTextColor();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == SearchBar.TextProperty.PropertyName)
UpdateText();
else if (e.PropertyName == SearchBar.PlaceholderProperty.PropertyName)
UpdatePlaceholder();
else if (e.PropertyName == SearchBar.FontAttributesProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == SearchBar.FontFamilyProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == SearchBar.FontSizeProperty.PropertyName)
UpdateFont();
else if (e.PropertyName == SearchBar.HorizontalTextAlignmentProperty.PropertyName)
UpdateAlignment();
else if (e.PropertyName == SearchBar.PlaceholderColorProperty.PropertyName)
UpdatePlaceholderColor();
else if (e.PropertyName == SearchBar.TextColorProperty.PropertyName)
UpdateTextColor();
}
protected override void UpdateBackgroundColor()
{
Control.Background = Element.BackgroundColor == Color.Default ? (Brush)System.Windows.Application.Current.Resources["PhoneTextBoxBrush"] : Element.BackgroundColor.ToBrush();
}
void PhoneTextBoxOnKeyUp(object sender, KeyEventArgs keyEventArgs)
{
if (keyEventArgs.Key == Key.Enter)
((ISearchBarController)Element).OnSearchButtonPressed();
}
void PhoneTextBoxOnTextChanged(object sender, System.Windows.Controls.TextChangedEventArgs textChangedEventArgs)
{
((IElementController)Element).SetValueFromRenderer(SearchBar.TextProperty, Control.Text);
}
void UpdateAlignment()
{
Control.TextAlignment = Element.HorizontalTextAlignment.ToNativeTextAlignment();
}
void UpdateFont()
{
if (Control == null)
return;
SearchBar searchbar = Element;
if (searchbar == null)
return;
bool searchbarIsDefault = searchbar.FontFamily == null && searchbar.FontSize == Device.GetNamedSize(NamedSize.Default, typeof(SearchBar), true) && searchbar.FontAttributes == FontAttributes.None;
if (searchbarIsDefault && !_fontApplied)
return;
if (searchbarIsDefault)
{
Control.ClearValue(System.Windows.Controls.Control.FontStyleProperty);
Control.ClearValue(System.Windows.Controls.Control.FontSizeProperty);
Control.ClearValue(System.Windows.Controls.Control.FontFamilyProperty);
Control.ClearValue(System.Windows.Controls.Control.FontWeightProperty);
Control.ClearValue(System.Windows.Controls.Control.FontStretchProperty);
}
else
Control.ApplyFont(searchbar);
_fontApplied = true;
}
void UpdatePlaceholder()
{
Control.Hint = Element.Placeholder ?? DefaultPlaceholder;
}
void UpdatePlaceholderColor()
{
Color placeholderColor = Element.PlaceholderColor;
if (placeholderColor.IsDefault)
{
if (_defaultPlaceholderColorBrush == null)
return;
Control.PlaceholderForegroundBrush = _defaultPlaceholderColorBrush;
}
if (_defaultPlaceholderColorBrush == null)
_defaultPlaceholderColorBrush = Control.PlaceholderForegroundBrush;
Control.PlaceholderForegroundBrush = placeholderColor.ToBrush();
}
void UpdateText()
{
Control.Text = Element.Text ?? "";
}
void UpdateTextColor()
{
Color textColor = Element.TextColor;
if (textColor.IsDefault)
{
if (_defaultTextColorBrush == null)
return;
Control.Foreground = _defaultTextColorBrush;
}
if (_defaultTextColorBrush == null)
_defaultTextColorBrush = Control.Foreground;
Control.Foreground = textColor.ToBrush();
}
}
}