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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace MaterialDesignThemes.Wpf
{
public static partial class HintProxyFabric
{
private sealed class ComboBoxHintProxy : IHintProxy
{
private readonly ComboBox _comboBox;
private readonly TextChangedEventHandler _comboBoxTextChangedEventHandler;
public ComboBoxHintProxy(ComboBox comboBox)
{
if (comboBox == null) throw new ArgumentNullException(nameof(comboBox));
_comboBox = comboBox;
_comboBoxTextChangedEventHandler = ComboBoxTextChanged;
_comboBox.AddHandler(TextBoxBase.TextChangedEvent, _comboBoxTextChangedEventHandler);
_comboBox.SelectionChanged += ComboBoxSelectionChanged;
_comboBox.Loaded += ComboBoxLoaded;
_comboBox.IsVisibleChanged += ComboBoxIsVisibleChanged;
_comboBox.IsKeyboardFocusWithinChanged += ComboBoxIsKeyboardFocusWithinChanged;
}
public object Content
{
get
{
if (_comboBox.IsEditable)
{
return _comboBox.Text;
}
var comboBoxItem = _comboBox.SelectedItem as ComboBoxItem;
return comboBoxItem != null
? comboBoxItem.Content
: _comboBox.SelectedItem;
}
}
public bool IsLoaded => _comboBox.IsLoaded;
public bool IsVisible => _comboBox.IsVisible;
public bool IsEmpty() => string.IsNullOrEmpty(_comboBox.Text);
public bool IsFocused() => _comboBox.IsEditable && _comboBox.IsKeyboardFocusWithin;
public event EventHandler ContentChanged;
public event EventHandler IsVisibleChanged;
public event EventHandler Loaded;
public event EventHandler FocusedChanged;
private void ComboBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
_comboBox.Dispatcher.InvokeAsync(() => ContentChanged?.Invoke(sender, EventArgs.Empty));
}
private void ComboBoxIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
IsVisibleChanged?.Invoke(sender, EventArgs.Empty);
}
private void ComboBoxLoaded(object sender, RoutedEventArgs e)
{
Loaded?.Invoke(sender, EventArgs.Empty);
}
private void ComboBoxTextChanged(object sender, TextChangedEventArgs e)
{
ContentChanged?.Invoke(sender, EventArgs.Empty);
}
private void ComboBoxIsKeyboardFocusWithinChanged(object sender, DependencyPropertyChangedEventArgs e)
{
FocusedChanged?.Invoke(sender, EventArgs.Empty);
}
public void Dispose()
{
_comboBox.RemoveHandler(TextBoxBase.TextChangedEvent, _comboBoxTextChangedEventHandler);
_comboBox.Loaded -= ComboBoxLoaded;
_comboBox.IsVisibleChanged -= ComboBoxIsVisibleChanged;
_comboBox.SelectionChanged -= ComboBoxSelectionChanged;
_comboBox.IsKeyboardFocusWithinChanged -= ComboBoxIsKeyboardFocusWithinChanged;
}
}
}
}
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