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using System;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
namespace MaterialDesignThemes.Wpf
{
[TemplatePart(Name = ThumbPartName, Type = typeof(Thumb))]
public class ClockItemButton : ToggleButton
{
public const string ThumbPartName = "PART_Thumb";
public static readonly DependencyProperty CentreXProperty = DependencyProperty.Register(
nameof(CentreX), typeof (double), typeof (ClockItemButton), new PropertyMetadata(default(double)));
public double CentreX
{
get { return (double) GetValue(CentreXProperty); }
set { SetValue(CentreXProperty, value); }
}
public static readonly DependencyProperty CentreYProperty = DependencyProperty.Register(
nameof(CentreY), typeof (double), typeof (ClockItemButton), new PropertyMetadata(default(double)));
public double CentreY
{
get { return (double) GetValue(CentreYProperty); }
set { SetValue(CentreYProperty, value); }
}
private static readonly DependencyPropertyKey XPropertyKey =
DependencyProperty.RegisterReadOnly(
"X", typeof(double), typeof(ClockItemButton),
new PropertyMetadata(default(double)));
public static readonly DependencyProperty XProperty =
XPropertyKey.DependencyProperty;
public double X
{
get { return (double)GetValue(XProperty); }
private set { SetValue(XPropertyKey, value); }
}
private static readonly DependencyPropertyKey YPropertyKey =
DependencyProperty.RegisterReadOnly(
"Y", typeof(double), typeof(ClockItemButton),
new PropertyMetadata(default(double)));
public static readonly DependencyProperty YProperty =
YPropertyKey.DependencyProperty;
private Thumb _thumb;
public double Y
{
get { return (double)GetValue(YProperty); }
private set { SetValue(YPropertyKey, value); }
}
public override void OnApplyTemplate()
{
if (_thumb != null)
{
_thumb.DragStarted -= ThumbOnDragStarted;
_thumb.DragDelta -= ThumbOnDragDelta;
_thumb.DragCompleted -= ThumbOnDragCompleted;
}
_thumb = GetTemplateChild(ThumbPartName) as Thumb;
if (_thumb != null)
{
_thumb.DragStarted += ThumbOnDragStarted;
_thumb.DragDelta += ThumbOnDragDelta;
_thumb.DragCompleted += ThumbOnDragCompleted;
}
base.OnApplyTemplate();
}
public static readonly RoutedEvent DragDeltaEvent =
EventManager.RegisterRoutedEvent(
"DragDelta",
RoutingStrategy.Bubble,
typeof (DragDeltaEventHandler),
typeof (ClockItemButton));
private static void OnDragDelta(
DependencyObject d, double horizontalChange, double verticalChange)
{
var instance = (ClockItemButton) d;
var dragDeltaEventArgs = new DragDeltaEventArgs(horizontalChange, verticalChange)
{
RoutedEvent = DragDeltaEvent,
Source = d
};
instance.RaiseEvent(dragDeltaEventArgs);
}
public static readonly RoutedEvent DragStartedEvent =
EventManager.RegisterRoutedEvent(
"DragStarted",
RoutingStrategy.Bubble,
typeof(DragStartedEventHandler),
typeof(ClockItemButton));
public static readonly RoutedEvent DragCompletedEvent =
EventManager.RegisterRoutedEvent(
"DragCompleted",
RoutingStrategy.Bubble,
typeof (DragCompletedEventHandler),
typeof (ClockItemButton));
private static void OnDragStarted(DependencyObject d, double horizontalOffset, double verticalOffset)
{
var instance = (ClockItemButton)d;
var dragStartedEventArgs = new DragStartedEventArgs(horizontalOffset, verticalOffset)
{
RoutedEvent = DragStartedEvent,
Source = d
};
instance.RaiseEvent(dragStartedEventArgs);
}
private static void OnDragCompleted(DependencyObject d, double horizontalChange, double verticalChange, bool canceled)
{
var instance = (ClockItemButton)d;
var dragCompletedEventArgs = new DragCompletedEventArgs(horizontalChange, verticalChange, canceled)
{
RoutedEvent = DragCompletedEvent,
Source = d
};
instance.RaiseEvent(dragCompletedEventArgs);
}
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (_thumb == null) return;
base.OnPreviewMouseLeftButtonDown(e);
if (!IsChecked.HasValue || !IsChecked.Value)
{
OnToggle();
}
}
/// <summary>
/// This override method is called when the control is clicked by mouse or keyboard
/// </summary>
protected override void OnClick()
{
if (_thumb == null)
base.OnClick();
}
private void ThumbOnDragStarted(object sender, DragStartedEventArgs dragStartedEventArgs)
{
//Get the absolute position of where the drag operation started
OnDragStarted(this, CentreX + dragStartedEventArgs.HorizontalOffset - Width / 2.0, CentreY + dragStartedEventArgs.VerticalOffset - Height / 2.0);
}
private void ThumbOnDragDelta(object sender, DragDeltaEventArgs dragDeltaEventArgs)
{
OnDragDelta(this, dragDeltaEventArgs.HorizontalChange, dragDeltaEventArgs.VerticalChange);
}
private void ThumbOnDragCompleted(object sender, DragCompletedEventArgs dragCompletedEventArgs)
{
OnDragCompleted(this, dragCompletedEventArgs.HorizontalChange, dragCompletedEventArgs.VerticalChange, dragCompletedEventArgs.Canceled);
}
protected override Size ArrangeOverride(Size finalSize)
{
Dispatcher.BeginInvoke(new Action(() =>
{
X = CentreX - finalSize.Width/2;
Y = CentreY - finalSize.Height/2;
}));
return base.ArrangeOverride(finalSize);
}
}
}
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