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using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Shapes;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.Windows
{
internal class HueEditorControl : CurrentColorCommitterControlBase
{
public HueEditorControl ()
{
DefaultStyleKey = typeof (HueEditorControl);
}
Rectangle hueChooser;
public static readonly DependencyProperty HueProperty =
DependencyProperty.Register (
nameof(HueColor), typeof (CommonColor), typeof (HueEditorControl),
new PropertyMetadata (new CommonColor(255, 0, 0), OnHueChanged));
public CommonColor HueColor {
get => (CommonColor)GetValue (HueProperty);
set => SetValue (HueProperty, value);
}
public static readonly DependencyProperty CursorPositionProperty =
DependencyProperty.Register (
nameof(CursorPosition), typeof (double), typeof (HueEditorControl),
new PropertyMetadata (0D));
public double CursorPosition {
get => (double)GetValue (CursorPositionProperty);
set => SetValue (CursorPositionProperty, value);
}
public override void OnApplyTemplate ()
{
base.OnApplyTemplate ();
this.hueChooser = GetTemplateChild ("hueChooser") as Rectangle;
if (this.hueChooser == null)
throw new InvalidOperationException ($"{nameof(HueEditorControl)} is missing a child Rectangle named \"hueChooser\"");
this.hueChooser.MouseLeftButtonDown += (s, e) => {
if (!this.hueChooser.IsMouseCaptured)
this.hueChooser.CaptureMouse ();
};
this.hueChooser.MouseMove += (s, e) => {
if (this.hueChooser.IsMouseCaptured && e.LeftButton == MouseButtonState.Pressed && this.hueChooser != null) {
var cursorPosition = e.GetPosition ((IInputElement)s).Y;
SetHueFromPosition (cursorPosition);
}
};
this.hueChooser.MouseLeftButtonUp += (s, e) => {
if (this.hueChooser.IsMouseCaptured) this.hueChooser.ReleaseMouseCapture ();
var cursorPosition = e.GetPosition ((IInputElement)s).Y;
SetHueFromPosition (cursorPosition);
RaiseEvent (new RoutedEventArgs (CommitCurrentColorEvent));
};
}
protected override void OnRenderSizeChanged (SizeChangedInfo sizeInfo)
{
base.OnRenderSizeChanged (sizeInfo);
CursorPosition = CommonColor.GetHueFromHueColor (HueColor) * ActualHeight / 360;
}
void SetHueFromPosition (double cursorPosition)
{
if (cursorPosition < 0)
cursorPosition = 0;
if (cursorPosition >= this.hueChooser.ActualHeight)
cursorPosition = this.hueChooser.ActualHeight - 1;
HueColor = CommonColor.GetHueColorFromHue (360 * cursorPosition / this.hueChooser.ActualHeight);
}
static void OnHueChanged (DependencyObject source, DependencyPropertyChangedEventArgs e)
{
var that = source as HueEditorControl;
if (that == null) return;
var newHue = ((CommonColor)e.NewValue);
that.CursorPosition = CommonColor.GetHueFromHueColor (newHue) * that.ActualHeight / 360;
}
}
}
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