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using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
namespace Xamarin.PropertyEditing.Windows
{
internal class ColorComponentBox : Control
{
static ColorComponentBox ()
{
DefaultStyleKeyProperty.OverrideMetadata (
typeof (ColorComponentBox),
new FrameworkPropertyMetadata (typeof (ColorComponentBox)));
}
public static readonly DependencyProperty GradientBrushProperty =
DependencyProperty.Register (
nameof (GradientBrush), typeof (Brush), typeof (ColorComponentBox),
new PropertyMetadata (null));
public Brush GradientBrush {
get => (Brush)GetValue (GradientBrushProperty);
set => SetValue (GradientBrushProperty, value);
}
public static readonly DependencyProperty UnitProperty =
DependencyProperty.Register (
nameof (Unit), typeof (string), typeof (ColorComponentBox),
new PropertyMetadata (""));
public string Unit {
get => (string)GetValue (UnitProperty);
set => SetValue (UnitProperty, value);
}
public static readonly DependencyProperty ValueProperty =
DependencyProperty.Register (
nameof (Value), typeof (double), typeof (ColorComponentBox),
new PropertyMetadata (0d, OnValueChanged));
private static void OnValueChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is ColorComponentBox colorBox && colorBox.innerTextBox != null) colorBox.SetTextFromValueAndUnit ();
}
public double Value {
get => (double)GetValue (ValueProperty);
set => SetValue (ValueProperty, value);
}
public static readonly RoutedEvent ValueChangedEvent =
EventManager.RegisterRoutedEvent (
nameof (ValueChanged), RoutingStrategy.Bubble, typeof (RoutedEventHandler), typeof (ColorComponentBox));
public event RoutedEventHandler ValueChanged {
add { AddHandler (ValueChangedEvent, value); }
remove { RemoveHandler (ValueChangedEvent, value); }
}
public override void OnApplyTemplate ()
{
base.OnApplyTemplate ();
this.innerTextBox = GetTemplateChild ("innerTextBox") as TextBoxEx;
if (this.innerTextBox == null)
throw new InvalidOperationException ($"{nameof (ColorComponentBox)} is missing a child TextBoxEx named \"innerTextBox\"");
SetTextFromValueAndUnit ();
this.innerTextBox.GotKeyboardFocus += (s, e) => {
var textValue = Value.ToString ("##0.#");
this.previousText = this.innerTextBox.Text = textValue;
};
this.innerTextBox.LostKeyboardFocus += (s, e) => {
UpdateValueIfChanged ();
};
this.innerTextBox.KeyUp += (s, e) => {
if (e.Key == Key.Return) {
UpdateValueIfChanged ();
}
};
}
private TextBoxEx innerTextBox;
private string previousText;
private void UpdateValueIfChanged()
{
if (this.innerTextBox != null && this.innerTextBox.Text != this.previousText) {
if (double.TryParse (this.innerTextBox.Text, NumberStyles.Float, CultureInfo.CurrentUICulture, out var value)) {
Value = value;
RaiseEvent (new RoutedEventArgs (ValueChangedEvent));
}
}
SetTextFromValueAndUnit ();
}
private void SetTextFromValueAndUnit()
{
if (this.innerTextBox != null) this.innerTextBox.Text = Value.ToString ("F0") + Unit;
}
}
}
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