/// <summary>
/// Returns the sum total of "low" range scores, given a RangeSlider
/// that just had its value modified.
/// </summary>
/// <param name="sender"></param>
/// <param name="newValue"></param>
/// <returns>Sum of current "low" values</returns>
double GetNewSumOfLowRange(RangeSliderX sender, double newValue)
{
// Start with the supplied new value
double total = newValue;
for (int i = 0; i < 5; i++)
{
if (_sliders[i] != sender)
{
total += _sliders[i].Low;
}
}
return(total);
}
public ScoreDistributionControl()
{
// Five columns, one for each star category RangeSlider
//ColumnDefinition col;
for (int i = 0; i < 5; i++)
{
AddColumn(20, GridUnitType.Star);
}
// Two rows, one for the header and one for the controls
AddRow(10, GridUnitType.Star);
AddRow(90, GridUnitType.Star);
// Control header
TextBlock text = new TextBlock();
text.Background = new SolidColorBrush(Colors.LightGray);
ToolTip tip = new ToolTip();
tip.Content = "Specify how the results should be distributed." + Environment.NewLine;
tip.Content += "For instance, if you set the one-star 'high' slider to 5%, it means that" + Environment.NewLine;
tip.Content += "the returned items will have no more than 5% one-star reviews.";
text.ToolTip = tip;
text.Foreground = new SolidColorBrush(Colors.Blue);
text.Text = "Result percentage ranges per star category";
text.TextAlignment = TextAlignment.Center;
AddContent(text, 0, 0, 5);
// Five range sliders; one for each star category
for (int i = 0; i < 5; i++)
{
RangeSliderX slider = new RangeSliderX();
slider.HeaderText = (i + 1).ToString() + " - Star";
slider.High = 100;
slider.Low = 0;
slider.VerticalAlignment = VerticalAlignment.Stretch;
slider.HorizontalAlignment = HorizontalAlignment.Stretch;
_sliders[i] = slider;
//_sliders[i] = new RangeSliderX((i+1).ToString() + " - Star", new DoubleRange(0, 100))
//{
// VerticalAlignment = System.Windows.VerticalAlignment.Stretch,
// HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch,
//};
_sliders[i].LowValueChanged += slider_LowValueChanged;
AddContent(_sliders[i], 1, i, 1);
}
}
/// <summary>
/// Given a RangeSlider, provides a list of the other RangeSliders that have
/// a positive "low" range value. Used when adjusting the total of the "low"
/// range sliders to not exceed 100%.
/// </summary>
/// <param name="sender"></param>
/// <returns></returns>
List <RangeSliderX> GetOtherSlidersWithPositiveLowScore(RangeSliderX sender)
{
List <RangeSliderX> results = new List <RangeSliderX>();
// Loop through and get the sliders (besides the sender)
// that have a positive "low" range value.
for (int i = 0; i < 5; i++)
{
if (_sliders[i] != sender && _sliders[i].Low > 0)
{
results.Add(_sliders[i]);
}
}
return(results);
}
public ScoreDistributionControl()
{
// Five columns, one for each star category RangeSlider
//ColumnDefinition col;
for (int i = 0; i < 5; i++)
{
AddColumn(20, GridUnitType.Star);
}
// Two rows, one for the header and one for the controls
AddRow(10, GridUnitType.Star);
AddRow(90, GridUnitType.Star);
// Control header
TextBlock text = new TextBlock();
text.Background = new SolidColorBrush(Colors.LightGray);
ToolTip tip = new ToolTip();
tip.Content = "Specify how the results should be distributed." + Environment.NewLine;
tip.Content += "For instance, if you set the one-star 'high' slider to 5%, it means that" + Environment.NewLine;
tip.Content += "the returned items will have no more than 5% one-star reviews.";
text.ToolTip = tip;
text.Foreground = new SolidColorBrush(Colors.Blue);
text.Text = "Result percentage ranges per star category";
text.TextAlignment = TextAlignment.Center;
AddContent(text, 0, 0, 5);
// Five range sliders; one for each star category
for (int i = 0; i < 5; i++)
{
RangeSliderX slider = new RangeSliderX();
slider.HeaderText = (i+1).ToString() + " - Star";
slider.High = 100;
slider.Low = 0;
slider.VerticalAlignment = VerticalAlignment.Stretch;
slider.HorizontalAlignment = HorizontalAlignment.Stretch;
_sliders[i] = slider;
//_sliders[i] = new RangeSliderX((i+1).ToString() + " - Star", new DoubleRange(0, 100))
//{
// VerticalAlignment = System.Windows.VerticalAlignment.Stretch,
// HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch,
//};
_sliders[i].LowValueChanged += slider_LowValueChanged;
AddContent(_sliders[i], 1, i, 1);
}
}
/// <summary>
/// Prevents user from specifying a total minimum number of results that exceeds 100%
/// by dynamically reducing the values of the other sliders.
/// </summary>
/// e.g. the user specifies 40% for the "low" range value of each of the five
/// star categories. The sum would be 200% and wouldn't make sense.
/// <param name="sender"></param>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
void slider_LowValueChanged(RangeSliderX sender, double oldValue, double newValue)
{
// If we're already dealing with with this problem, allow it to resolve.
// This prevents a cascade of events as every change to a low score causes
// this method to be called
if (resolvingPercentageError) { return; }
// Figure out whether the change puts the "low" sum over 100%
double sum = GetNewSumOfLowRange(sender, newValue);
if (sum <= 100) { return; }
resolvingPercentageError = true;
// Loop through the sliders, reducing each until
// the total amount is less than or equal to 100
while (sum > 100)
{
// We can't do anything with sliders with a zero "low" value, so get
// a list of other sliders that have a non-zero "low" value
List<RangeSliderX> hasLowRangeValue = GetOtherSlidersWithPositiveLowScore(sender);
foreach (RangeSliderX rangeSlider in hasLowRangeValue)
{
// how much more we have to distribute
double amountAboveOneHundred = sum - 100;
// The amount over 100 divided by the number of sliders that have
// a "low" value.
double shareOfAmountOver = Math.Ceiling(amountAboveOneHundred / hasLowRangeValue.Count);
// Try to subtract this amount from the current slider
double remainder = rangeSlider.Low - Math.Ceiling(amountAboveOneHundred / hasLowRangeValue.Count);
// Two possibilities:
// 1) The slider had enough "low" value to subtract its share of the overage
if (remainder > 0)
{
sum -= shareOfAmountOver;
rangeSlider.Low = remainder;
}
else // 2) We could only subtract a part of this slider's share before it became zero
{
// We've reduced this slider's "low" value to zero
rangeSlider.Low = 0;
// The negative remainder represents the amount that we couldn't subtract
// from this slider. Adjust sum to reflect the portion that we subtracted
sum -= (shareOfAmountOver - Math.Abs(remainder));
}
} // for each rangeslider with a low value
} // sum > 100
// The problem has been successfully resolved.
resolvingPercentageError = false;
}
/// <summary>
/// Given a RangeSlider, provides a list of the other RangeSliders that have
/// a positive "low" range value. Used when adjusting the total of the "low"
/// range sliders to not exceed 100%.
/// </summary>
/// <param name="sender"></param>
/// <returns></returns>
List<RangeSliderX> GetOtherSlidersWithPositiveLowScore(RangeSliderX sender)
{
List<RangeSliderX> results = new List<RangeSliderX>();
// Loop through and get the sliders (besides the sender)
// that have a positive "low" range value.
for (int i = 0; i < 5; i++)
{
if (_sliders[i] != sender && _sliders[i].Low > 0)
{ results.Add(_sliders[i]); }
}
return results;
}
/// <summary>
/// Returns the sum total of "low" range scores, given a RangeSlider
/// that just had its value modified.
/// </summary>
/// <param name="sender"></param>
/// <param name="newValue"></param>
/// <returns>Sum of current "low" values</returns>
double GetNewSumOfLowRange(RangeSliderX sender,double newValue)
{
// Start with the supplied new value
double total = newValue;
for (int i = 0; i < 5; i++)
{
if (_sliders[i] != sender)
{
total += _sliders[i].Low;
}
}
return total;
}
/// <summary>
/// Prevents user from specifying a total minimum number of results that exceeds 100%
/// by dynamically reducing the values of the other sliders.
/// </summary>
/// e.g. the user specifies 40% for the "low" range value of each of the five
/// star categories. The sum would be 200% and wouldn't make sense.
/// <param name="sender"></param>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
void slider_LowValueChanged(RangeSliderX sender, double oldValue, double newValue)
{
// If we're already dealing with with this problem, allow it to resolve.
// This prevents a cascade of events as every change to a low score causes
// this method to be called
if (resolvingPercentageError)
{
return;
}
// Figure out whether the change puts the "low" sum over 100%
double sum = GetNewSumOfLowRange(sender, newValue);
if (sum <= 100)
{
return;
}
resolvingPercentageError = true;
// Loop through the sliders, reducing each until
// the total amount is less than or equal to 100
while (sum > 100)
{
// We can't do anything with sliders with a zero "low" value, so get
// a list of other sliders that have a non-zero "low" value
List <RangeSliderX> hasLowRangeValue = GetOtherSlidersWithPositiveLowScore(sender);
foreach (RangeSliderX rangeSlider in hasLowRangeValue)
{
// how much more we have to distribute
double amountAboveOneHundred = sum - 100;
// The amount over 100 divided by the number of sliders that have
// a "low" value.
double shareOfAmountOver = Math.Ceiling(amountAboveOneHundred / hasLowRangeValue.Count);
// Try to subtract this amount from the current slider
double remainder = rangeSlider.Low - Math.Ceiling(amountAboveOneHundred / hasLowRangeValue.Count);
// Two possibilities:
// 1) The slider had enough "low" value to subtract its share of the overage
if (remainder > 0)
{
sum -= shareOfAmountOver;
rangeSlider.Low = remainder;
}
else // 2) We could only subtract a part of this slider's share before it became zero
{
// We've reduced this slider's "low" value to zero
rangeSlider.Low = 0;
// The negative remainder represents the amount that we couldn't subtract
// from this slider. Adjust sum to reflect the portion that we subtracted
sum -= (shareOfAmountOver - Math.Abs(remainder));
}
} // for each rangeslider with a low value
} // sum > 100
// The problem has been successfully resolved.
resolvingPercentageError = false;
}
