详解WPF双滑块控件的使用和强制捕获鼠标事件焦点

private void ell_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                double percentage = e.GetPosition(rect).X / rect.ActualWidth;
                double value = (Maximum - Minimum) * percentage + Minimum;
                if (_ellFromPressed)
                {
                    MinValue = (int)value;

                }
                if (_ellToPressed)
                {
                    MaxValue = (int)value;
                }
            }
        }

//最小值变化
        private void MinValuePropertyChanged()
        {
            if (MinValue < Minimum)
            {
                MinValue = Minimum;
                return;
            }
            if (MinValue > MaxValue)
            {
                MaxValue = MinValue;
            }
            //滑块位置变化
            _offsetFrom = (MinValue - Minimum) * rect.ActualWidth / (Maximum - Minimum) - 8;
            Canvas.SetLeft(ellFrom, _offsetFrom);
            //高亮矩形长度和位置的变化
            if (_offsetTo != -1)
            {
                double diff = _offsetTo - _offsetFrom;
                if (diff >= 0)
                {
                    rectHighLight.Width = diff;
                    Canvas.SetLeft(rectHighLight, _offsetFrom);
                }
            }
        }

        //最大值变化
        private void MaxValuePropertyChanged()
        {
            if (MaxValue > Maximum)
            {
                MaxValue = Maximum;
                return;
            }
            if (MaxValue < MinValue)
            {
                MinValue = MaxValue;
            }
            //滑块位置变化
            _offsetTo = (MaxValue - Minimum) * rect.ActualWidth / (Maximum - Minimum) - 8;
            Canvas.SetLeft(ellTo, _offsetTo);
            //高亮矩形长度和位置的变化
            if (_offsetFrom != -1)
            {
                double diff = _offsetTo - _offsetFrom;
                if (diff >= 0)
                {
                    rectHighLight.Width = diff;
                    Canvas.SetLeft(rectHighLight, _offsetFrom);
                }
            }
        }

<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
            <local:DoubleThumbSlider x:Name="dts" Width="500" Minimum="100" Maximum="200"></local:DoubleThumbSlider>
            <TextBox Name="tMin" Width="48" Text="{Binding ElementName=dts,Path=MinValue,UpdateSourceTrigger=Explicit,Mode=TwoWay}" PreviewKeyUp="tbox_PreviewKeyUp"></TextBox>
            <TextBlock Margin="5,0" Text="-"></TextBlock>
            <TextBox Name="tMax" Width="48" Text="{Binding ElementName=dts,Path=MaxValue,UpdateSourceTrigger=Explicit,Mode=TwoWay}" PreviewKeyUp="tbox_PreviewKeyUp"></TextBox>
        </StackPanel>

private void tbox_PreviewKeyUp(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                TextBox tbox = (TextBox)sender;
                var binding = tbox.GetBindingExpression(TextBox.TextProperty);
                binding.UpdateSource();
            }
        }