Re: click on position to move slider

03-06-2009 5:54 AM |

Slider don't implement the MouseLeftButtonDown event, so we can't capture mouse action by handling this event.

I write a slider inherent from Slider, exposed  custom Click event.

CustomSlider Code:

   public class CustomSlider: Slider
    {
        public CustomSlider()
        {
            DefaultStyleKey = typeof(Slider);
        }
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            RepeatButton rb;
            rb = base.GetTemplateChild("HorizontalTrackLargeChangeIncreaseRepeatButton") as RepeatButton;
            rb.MouseMove += new MouseEventHandler(rb_MouseMove);
            rb.Click += new RoutedEventHandler(rb_Click);
            rb = base.GetTemplateChild("HorizontalTrackLargeChangeDecreaseRepeatButton") as RepeatButton;
            rb.MouseMove += new MouseEventHandler(rb_MouseMove);
            rb.Click += new RoutedEventHandler(rb_Click);
            rb = base.GetTemplateChild("VerticalTrackLargeChangeIncreaseRepeatButton") as RepeatButton;
            rb.Click += new RoutedEventHandler(rb_Click);
            rb.MouseMove += new MouseEventHandler(rb_MouseMove);
            rb = base.GetTemplateChild("VerticalTrackLargeChangeDecreaseRepeatButton") as RepeatButton;
            rb.Click += new RoutedEventHandler(rb_Click);
            rb.MouseMove += new MouseEventHandler(rb_MouseMove);

            //rb.
        }

        Point ps;
        void rb_MouseMove(object sender, MouseEventArgs e)
        {
            ps=e.GetPosition(this);
        }

        public event EventHandler MyClickEvent;
        void rb_Click(object sender, RoutedEventArgs e)
        {
            if(MyClickEvent!=null)
                MyClickEvent(this,new PositionEventArgs(ps));
        }
    }
    public class PositionEventArgs : EventArgs
    {
        public Point Position { set; get; }
        public PositionEventArgs() { }
        public PositionEventArgs(Point p) { Position = p; }
    }

 

Then, we use this slider to implement "click and positioning" job. 

XAML:

<my:CustomSlider Name="sl1" MyClickEvent="CustomSlider_MyClickEvent_1"/>

XAML code behind:

        private void CustomSlider_MyClickEvent_1(object sender, PositionEventArgs e)
        {
            double progress = sl1.Maximum * e.Position.X / sl1.ActualWidth;
            sl1.Value = progress;
        }