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using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace Xamarin.Forms.Platform.WinRT
{
public class SearchBoxQuerySubmittedEventArgs
: EventArgs
{
}
public class SearchBoxQueryChangedEventArgs
: EventArgs
{
public SearchBoxQueryChangedEventArgs (string query)
{
QueryText = query;
}
public string QueryText
{
get;
private set;
}
}
public delegate void QueryChangedEventHandler (SearchBox search, SearchBoxQueryChangedEventArgs args);
public delegate void QuerySubmittedEventHandler (SearchBox search, SearchBoxQuerySubmittedEventArgs args);
public sealed partial class SearchBox
{
public SearchBox ()
{
InitializeComponent ();
IsEnabledChanged += OnIsEnabledChanged;
}
public event QuerySubmittedEventHandler QuerySubmitted;
public event QueryChangedEventHandler QueryChanged;
public static readonly DependencyProperty QueryTextProperty = DependencyProperty.Register (
"QueryText", typeof(string), typeof(SearchBox), new PropertyMetadata (null, OnQueryTextChanged));
public string QueryText
{
get { return (string)GetValue (QueryTextProperty); }
set { SetValue (QueryTextProperty, value); }
}
public static readonly DependencyProperty PlaceholderTextProperty = DependencyProperty.Register (
"PlaceholderText", typeof(string), typeof(SearchBox), new PropertyMetadata (null, OnPlaceholderChanged));
public string PlaceholderText
{
get { return (string)GetValue (PlaceholderTextProperty); }
set { SetValue (PlaceholderTextProperty, value); }
}
public static readonly DependencyProperty HorizontalTextAlignmentProperty = DependencyProperty.Register (
"HorizontalTextAlignment", typeof(string), typeof(SearchBox), new PropertyMetadata (null, OnAlignmentChanged));
public TextAlignment HorizontalTextAlignment
{
get { return (TextAlignment)GetValue (HorizontalTextAlignmentProperty); }
set { SetValue (HorizontalTextAlignmentProperty, value); }
}
protected override void OnApplyTemplate ()
{
base.OnApplyTemplate ();
GoToNormal ();
_searchTextBox = (TextBox)GetTemplateChild ("SearchTextBox");
((Windows.UI.Xaml.Controls.Button) GetTemplateChild ("SearchButton")).Click += OnSearchButtonClicked;
UpdatePlaceholder ();
UpdateAlignment ();
}
protected override void OnGotFocus (RoutedEventArgs e)
{
base.OnGotFocus (e);
VisualStateManager.GoToState (this, "Focused", true);
}
protected override void OnLostFocus (RoutedEventArgs e)
{
base.OnLostFocus (e);
GoToNormal ();
}
void OnSearchButtonClicked (object sender, RoutedEventArgs e)
{
var querySubmitted = QuerySubmitted;
if (querySubmitted != null)
querySubmitted (this, new SearchBoxQuerySubmittedEventArgs());
}
TextBox _searchTextBox;
void GoToNormal ()
{
VisualStateManager.GoToState (this, (IsEnabled) ? "Normal" : "Disabled", false);
}
void UpdatePlaceholder ()
{
if (_searchTextBox == null)
return;
_searchTextBox.PlaceholderText = PlaceholderText;
}
void OnIsEnabledChanged (object sender, DependencyPropertyChangedEventArgs e)
{
string state = "Normal";
if (!(bool) e.NewValue)
state = "Disabled";
else if (FocusState != FocusState.Unfocused)
state = "Focused";
VisualStateManager.GoToState (this, state, true);
}
static void OnQueryTextChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var search = (SearchBox) d;
var changed = search.QueryChanged;
if (changed != null)
changed (search, new SearchBoxQueryChangedEventArgs ((string) e.NewValue));
}
static void OnPlaceholderChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((SearchBox) d).UpdatePlaceholder ();
}
static void OnAlignmentChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((SearchBox) d).UpdateAlignment ();
}
void UpdateAlignment ()
{
if (_searchTextBox == null) {
return;
}
_searchTextBox.TextAlignment = HorizontalTextAlignment.ToNativeTextAlignment();
}
}
}
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