/// <summary>
/// Prepares the grid's rows or columns for measurement.
/// </summary>
/// <param name="definitions">The collection of row or column definitions to prepare for measurement.</param>
/// <param name="infiniteDimension">A value indicating whether the constraint for this dimension is infinite.</param>
private void PrepareForMeasure(IDefinitionBaseCollection definitions, Boolean infiniteDimension)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
var dim = 0.0;
var dimMin = def.MinDimension;
var dimMax = Math.Max(dimMin, def.MaxDimension);
switch (def.Dimension.GridUnitType)
{
case GridUnitType.Auto:
def.AssumedUnitType = GridUnitType.Auto;
dim = Double.PositiveInfinity;
break;
case GridUnitType.Pixel:
def.AssumedUnitType = GridUnitType.Pixel;
dim = def.Dimension.Value;
dimMin = Math.Max(dimMin, Math.Min(dim, dimMax));
break;
case GridUnitType.Star:
def.AssumedUnitType = infiniteDimension ? GridUnitType.Auto : GridUnitType.Star;
dim = Double.PositiveInfinity;
break;
}
def.ResetContentDimension(dimMin);
def.MeasuredDimension = Math.Max(dimMin, Math.Min(dim, dimMax));
}
}
/// <summary>
/// Retrieves a buffer containing all of the row/column definitions in the specified span.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <param name="auto">A value indicating whether to include auto-sized definitions.</param>
/// <param name="nonauto">A value indicating whether to include non-auto-sized definitions.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List <DefinitionBase> EnumerateDefinitionsInSpan(IDefinitionBaseCollection definitions, Int32 index, Int32 span,
Boolean auto = true, Boolean nonauto = true)
{
spanEnumerationBuffer.Clear();
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
switch (def.AssumedUnitType)
{
case GridUnitType.Auto:
if (auto)
{
spanEnumerationBuffer.Add(def);
}
break;
case GridUnitType.Pixel:
case GridUnitType.Star:
if (nonauto)
{
spanEnumerationBuffer.Add(def);
}
break;
}
}
return(spanEnumerationBuffer);
}
/// <summary>
/// Resolves the size of the grid's star-sized rows or columns.
/// </summary>
/// <param name="definitions">The collection of rows or columns to resolve.</param>
/// <param name="availableDimension">The amount of space which is available to the grid.</param>
private void ResolveStars(IDefinitionBaseCollection definitions, Double availableDimension)
{
if ((definitions == RowDefinitions && starRowCount == 0) ||
(definitions == ColumnDefinitions && starColumnCount == 0))
{
return;
}
availableDimension -= CalculateUsedDimension(definitions);
var sumOfStarFactors = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
{
continue;
}
sumOfStarFactors += def.Dimension.Value;
}
var starFactorUnit = (sumOfStarFactors == 0) ? 0 : availableDimension / sumOfStarFactors;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
{
continue;
}
def.MeasuredDimension = Math.Max(0, starFactorUnit * def.Dimension.Value);
}
}
/// <summary>
/// Performs layout rounding on the specified definition collection.
/// </summary>
/// <param name="definitions">The definition collection on which to perform layout rounding.</param>
private void RoundDimensions(IDefinitionBaseCollection definitions)
{
if (definitions.Count == 0)
{
return;
}
var errorContent = 0.0;
var error = 0.0;
for (int i = 0; i < definitions.Count - 1; i++)
{
var oldValueContent = definitions[i].MeasuredContentDimension;
var oldValue = definitions[i].MeasuredDimension;
if (!Double.IsInfinity(oldValueContent))
{
definitions[i].MeasuredContentDimension = PerformLayoutRounding(oldValueContent);
errorContent += (definitions[i].MeasuredContentDimension - oldValueContent);
}
if (!Double.IsInfinity(oldValue))
{
definitions[i].MeasuredDimension = PerformLayoutRounding(oldValue);
error += (definitions[i].MeasuredDimension - oldValue);
}
}
definitions[definitions.Count - 1].MeasuredContentDimension += errorContent;
definitions[definitions.Count - 1].MeasuredDimension += error;
}
/// <summary>
/// Prepares the grid's rows or columns for arrangement.
/// </summary>
/// <param name="definitions">The collection of row or column definitions to prepare for measurement.</param>
private void PrepareForArrange(IDefinitionBaseCollection definitions)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
def.AssumedUnitType = def.Dimension.GridUnitType;
}
}
/// <summary>
/// Measures the total dimension of the specified row or column span.
/// </summary>
/// <param name="definitions">The collection of row or column definitions for which to calculate a total dimension.</param>
/// <param name="index">The index of the first row or column in the span.</param>
/// <param name="span">The number of rows or columns in the span.</param>
/// <returns>The total dimension of the specified row or column span.</returns>
private Double CalculateSpanDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var size = 0.0;
for (int i = 0; i < span; i++)
{
size += definitions[index + i].ActualDimension;
}
return(size);
}
/// <summary>
/// Retrieves a buffer containing all of the specified definitions, sorted by their minimum arranged size.
/// </summary>
private List <DefinitionBase> EnumerateDefinitionsByMinArrangedSize(IDefinitionBaseCollection definitions)
{
spanEnumerationBuffer.Clear();
for (int i = 0; i < definitions.Count; i++)
{
spanEnumerationBuffer.Add(definitions[i]);
}
spanEnumerationBuffer.Sort(cmpByMinArrangedSize);
return(spanEnumerationBuffer);
}
/// <summary>
/// Finalizes the dimension of the grid's rows or columns during the arrange phase.
/// </summary>
/// <param name="dimension">The collection of row or column definitions to finalize.</param>
/// <param name="definitions">The grid's final arranged dimension.</param>
private void FinalizeDimension(IDefinitionBaseCollection definitions, Double dimension)
{
FinalizeStars(definitions, dimension);
var position = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
def.Position = position;
position += def.ActualDimension;
}
}
/// <summary>
/// Retrieves a buffer containing all of the specified definitions, sorted by their minimum arranged size.
/// </summary>
private List <DefinitionBase> EnumerateDefinitionsByMinArrangedSize(IDefinitionBaseCollection definitions)
{
spanEnumerationBuffer.Clear();
for (int i = 0; i < definitions.Count; i++)
{
spanEnumerationBuffer.Add(definitions[i]);
}
spanEnumerationBuffer.Sort((def1, def2) =>
{
var def1Min = Math.Max(def1.MinDimension, def1.MeasuredContentDimension);
var def2Min = Math.Max(def2.MinDimension, def2.MeasuredContentDimension);
return(def2Min.CompareTo(def1Min));
});
return(spanEnumerationBuffer);
}
/// <summary>
/// Gets the number of definitions in the specified collection with a unit
/// type of <see cref="GridUnitType.Star"/>.
/// </summary>
private Int32 CountStars(IDefinitionBaseCollection definitions)
{
var count = 0;
if (definitions != null)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType == GridUnitType.Star)
{
count++;
}
}
}
return(count);
}
/// <summary>
/// Measures the total amount of space which is occupied by non-star rows or columns in the specified collection.
/// </summary>
/// <param name="definitions">The collection of row or column definitions for which to calculate a used dimension.</param>
/// <returns>The total amount of space which is occupied by non-star columns in <paramref name="definitions"/>.</returns>
private Double CalculateUsedDimension(IDefinitionBaseCollection definitions)
{
var dimension = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
switch (def.AssumedUnitType)
{
case GridUnitType.Auto:
case GridUnitType.Pixel:
dimension += def.ActualDimension;
break;
}
}
return(dimension);
}
/// <summary>
/// Finalizes the dimensions of the grid's star rows or columns.
/// </summary>
/// <param name="dimension">The collection of row or column definitions to finalize.</param>
/// <param name="definitions">The grid's final arranged dimension.</param>
private void FinalizeStars(IDefinitionBaseCollection definitions, Double dimension)
{
var undistributed = dimension - CalculateUsedDimension(definitions);
var starCombinedWeight = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType == GridUnitType.Star)
{
starCombinedWeight += def.Dimension.Value;
}
}
if (starCombinedWeight <= 0)
{
return;
}
var starCountVisited = 0.0;
var buffer = EnumerateDefinitionsByMinArrangedSize(definitions);
for (int i = 0; i < buffer.Count; i++)
{
var def = buffer[i];
if (def.AssumedUnitType != GridUnitType.Star)
{
continue;
}
var defShare = def.Dimension.Value * (undistributed / (starCombinedWeight - starCountVisited));
var defMinSize = Math.Max(def.MinDimension, def.MeasuredContentDimension);
var defDimension = Math.Max(defMinSize, Math.Max(0, Math.Min(defShare, def.MaxDimension)));
def.MeasuredDimension = Math.Min(undistributed, defDimension);
undistributed -= defDimension;
starCountVisited += def.Dimension.Value;
}
buffer.Clear();
}
/// <summary>
/// Finalizes the dimensions of the grid's star rows or columns.
/// </summary>
/// <param name="dimension">The collection of row or column definitions to finalize.</param>
/// <param name="definitions">The grid's final arranged dimension.</param>
private void FinalizeStars(IDefinitionBaseCollection definitions, Double dimension)
{
var undistributed = dimension - CalculateUsedDimension(definitions);
var starCombinedWeight = 0.0;
var starCount = 0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType == GridUnitType.Star)
{
starCount++;
starCombinedWeight += def.Dimension.Value;
}
}
if (starCount == 0 || starCombinedWeight == 0)
{
return;
}
var starCountVisited = 0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
{
continue;
}
var defShare = undistributed / (starCount - starCountVisited);
var defDimension = Math.Max(0, Math.Min(defShare, def.MaxDimension));
def.MeasuredDimension = defDimension;
undistributed -= defDimension;
starCountVisited++;
}
}
/// <summary>
/// Finalizes the dimension of the grid's rows or columns during the arrange phase.
/// </summary>
/// <param name="dimension">The collection of row or column definitions to finalize.</param>
/// <param name="definitions">The grid's final arranged dimension.</param>
private void FinalizeDimension(IDefinitionBaseCollection definitions, Double dimension)
{
FinalizeStars(definitions, dimension);
var position = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
def.Position = position;
position += def.ActualDimension;
}
}
/// <summary>
/// Finalizes the dimensions of the grid's star rows or columns.
/// </summary>
/// <param name="dimension">The collection of row or column definitions to finalize.</param>
/// <param name="definitions">The grid's final arranged dimension.</param>
private void FinalizeStars(IDefinitionBaseCollection definitions, Double dimension)
{
var undistributed = dimension - CalculateUsedDimension(definitions);
var starCombinedWeight = 0.0;
var starCount = 0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType == GridUnitType.Star)
{
starCount++;
starCombinedWeight += def.Dimension.Value;
}
}
if (starCount == 0 || starCombinedWeight == 0)
return;
var starCountVisited = 0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
continue;
var defShare = undistributed / (starCount - starCountVisited);
var defDimension = Math.Max(0, Math.Min(defShare, def.MaxDimension));
def.MeasuredDimension = defDimension;
undistributed -= defDimension;
starCountVisited++;
}
}
/// <summary>
/// Retrieves a buffer containing all of the row/column definitions in the specified span.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <param name="auto">A value indicating whether to include auto-sized definitions.</param>
/// <param name="nonauto">A value indicating whether to include non-auto-sized definitions.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List<DefinitionBase> EnumerateDefinitionsInSpan(IDefinitionBaseCollection definitions, Int32 index, Int32 span,
Boolean auto = true, Boolean nonauto = true)
{
spanEnumerationBuffer.Clear();
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
switch (def.AssumedUnitType)
{
case GridUnitType.Auto:
if (auto)
{
spanEnumerationBuffer.Add(def);
}
break;
case GridUnitType.Pixel:
case GridUnitType.Star:
if (nonauto)
{
spanEnumerationBuffer.Add(def);
}
break;
}
}
return spanEnumerationBuffer;
}
/// <summary>
/// Retrieves a buffer containing all of the non-auto-sized row/column definitions in the specified span.
/// The buffer is sorted in ascending order of <see cref="DefinitionBase.MaxDimension"/>.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List<DefinitionBase> EnumerateNonAutoDefinitionsInSpanByMaxDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var buffer = EnumerateDefinitionsInSpan(definitions, index, span, auto: false);
buffer.Sort((def1, def2) =>
{
return def1.MaxDimension.CompareTo(def2.MaxDimension);
});
return buffer;
}
/// <summary>
/// Gets the number of definitions in the specified collection with a unit
/// type of <see cref="GridUnitType.Star"/>.
/// </summary>
private Int32 CountStars(IDefinitionBaseCollection definitions)
{
var count = 0;
if (definitions != null)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType == GridUnitType.Star)
count++;
}
}
return count;
}
/// <summary>
/// Distributes the specified dimension amongst all of the cells in the specified row or column span.
/// </summary>
/// <param name="definitions">The collection of row or column definitions amongst which to distribute the specified dimension.</param>
/// <param name="index">The index of the first row or column in the span.</param>
/// <param name="span">The number of rows or columns in the span.</param>
/// <param name="dimension">The amount of space to distribute between the rows or columns in the span.</param>
private void DistributeSpanDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span, Double dimension)
{
if (dimension == 0.0)
return;
var spanContentDimension = 0.0;
var spanDesiredDimension = 0.0;
var spanMaximumDimension = 0.0;
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
spanContentDimension += def.MeasuredContentDimension;
spanDesiredDimension += def.PreferredDesiredDimension;
spanMaximumDimension += Math.Max(def.MaxDimension, spanContentDimension);
}
/* When the dimension to distribute is less than the current content
* size of the span, we don't need to do anything. */
if (dimension <= spanContentDimension)
return;
/* Dimension to distribute is less than the desired dimension of the span.
* Ignore auto defs, distribute equally into content sizes of other defs in order
* of lowest DesiredDimension to highest. */
if (dimension <= spanDesiredDimension)
{
var undistributed = dimension;
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
if (def.AssumedUnitType == GridUnitType.Auto)
undistributed -= def.MeasuredContentDimension;
}
var defsInSpan = EnumerateNonAutoDefinitionsInSpanByDesiredDimension(definitions, index, span);
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDistribution = undistributed / (defsInSpan.Count - i);
var defContentSize = Math.Min(defDistribution, def.PreferredDesiredDimension);
def.ExpandContentDimension(defContentSize);
undistributed -= defContentSize;
}
defsInSpan.Clear();
return;
}
/* Dimension to distribute is less than the maximum dimension of the span.
* Distribute into non-auto defs first, in order of lowest MaxSize to highest,
* then distribute any remaining space into auto defs. */
if (dimension <= spanMaximumDimension)
{
var undistributed = dimension - spanDesiredDimension;
var defsInSpan = EnumerateNonAutoDefinitionsInSpanByMaxDimension(definitions, index, span);
var autoInSpan = span - defsInSpan.Count;
// Non-auto defs
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDesiredSize = def.PreferredDesiredDimension;
var defDistribution = defDesiredSize + undistributed / (span - autoInSpan - i);
var defContentSize = Math.Min(defDistribution, def.MaxDimension);
def.ExpandContentDimension(defContentSize);
var delta = def.MeasuredContentDimension - defDesiredSize;
undistributed -= delta;
}
// Auto defs
defsInSpan = EnumerateAutoDefinitionsInSpanByContentDimension(definitions, index, span);
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDesiredSize = def.PreferredDesiredDimension;
var defDistribution = defDesiredSize + undistributed / (autoInSpan - i);
var defContentSize = Math.Min(defDistribution, def.MaxDimension);
def.ExpandContentDimension(defContentSize);
var delta = def.MeasuredContentDimension - defDesiredSize;
undistributed -= delta;
}
return;
}
/* Dimension to distribute is greater than the max size of the span.
* Distribute equally into all spans. */
for (int i = 0; i < span; i++)
{
definitions[index + i].ExpandContentDimension(dimension / span);
}
}
/// <summary>
/// Measures the total dimension of the specified row or column span.
/// </summary>
/// <param name="definitions">The collection of row or column definitions for which to calculate a total dimension.</param>
/// <param name="index">The index of the first row or column in the span.</param>
/// <param name="span">The number of rows or columns in the span.</param>
/// <returns>The total dimension of the specified row or column span.</returns>
private Double CalculateSpanDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var size = 0.0;
for (int i = 0; i < span; i++)
{
size += definitions[index + i].ActualDimension;
}
return size;
}
/// <summary>
/// Retrieves a buffer containing all of the auto-sized row/column definitions in the specified span.
/// The buffer is sorted in ascending order of <see cref="DefinitionBase.MeasuredContentDimension"/>.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List <DefinitionBase> EnumerateAutoDefinitionsInSpanByContentDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var buffer = EnumerateDefinitionsInSpan(definitions, index, span, nonauto: false);
buffer.Sort((def1, def2) =>
{
return(def1.MeasuredContentDimension.CompareTo(def2.MeasuredContentDimension));
});
return(buffer);
}
/// <summary>
/// Resolves the size of the grid's star-sized rows or columns.
/// </summary>
/// <param name="definitions">The collection of rows or columns to resolve.</param>
/// <param name="availableDimension">The amount of space which is available to the grid.</param>
private void ResolveStars(IDefinitionBaseCollection definitions, Double availableDimension)
{
if ((definitions == RowDefinitions && starRowCount == 0) ||
(definitions == ColumnDefinitions && starColumnCount == 0))
{
return;
}
availableDimension -= CalculateUsedDimension(definitions);
var sumOfStarFactors = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
continue;
sumOfStarFactors += def.Dimension.Value;
}
var starFactorUnit = (sumOfStarFactors == 0) ? 0 : availableDimension / sumOfStarFactors;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
if (def.AssumedUnitType != GridUnitType.Star)
continue;
def.MeasuredDimension = Math.Max(0, starFactorUnit * def.Dimension.Value);
}
}
/// <summary>
/// Performs layout rounding on the specified definition collection.
/// </summary>
/// <param name="definitions">The definition collection on which to perform layout rounding.</param>
private void RoundDimensions(IDefinitionBaseCollection definitions)
{
if (definitions.Count == 0)
return;
var errorContent = 0.0;
var error = 0.0;
for (int i = 0; i < definitions.Count - 1; i++)
{
var oldValueContent = definitions[i].MeasuredContentDimension;
var oldValue = definitions[i].MeasuredDimension;
definitions[i].MeasuredContentDimension = PerformLayoutRounding(oldValueContent);
definitions[i].MeasuredDimension = PerformLayoutRounding(oldValue);
errorContent += (definitions[i].MeasuredContentDimension - oldValueContent);
error += (definitions[i].MeasuredDimension - oldValue);
}
definitions[definitions.Count - 1].MeasuredContentDimension += errorContent;
definitions[definitions.Count - 1].MeasuredDimension += error;
}
/// <summary>
/// Retrieves a buffer containing all of the auto-sized row/column definitions in the specified span.
/// The buffer is sorted in ascending order of <see cref="DefinitionBase.MeasuredContentDimension"/>.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List <DefinitionBase> EnumerateAutoDefinitionsInSpanByContentDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var buffer = EnumerateDefinitionsInSpan(definitions, index, span, nonauto: false);
buffer.Sort(cmpByMeasuredContentDimension);
return(buffer);
}
/// <summary>
/// Retrieves a buffer containing all of the non-auto-sized row/column definitions in the specified span.
/// The buffer is sorted in ascending order of <see cref="DefinitionBase.PreferredDesiredDimension"/>.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List <DefinitionBase> EnumerateNonAutoDefinitionsInSpanByDesiredDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var buffer = EnumerateDefinitionsInSpan(definitions, index, span, auto: false);
buffer.Sort((def1, def2) =>
{
return(def1.PreferredDesiredDimension.CompareTo(def2.PreferredDesiredDimension));
});
return(buffer);
}
/// <summary>
/// Retrieves a buffer containing all of the non-auto-sized row/column definitions in the specified span.
/// The buffer is sorted in ascending order of <see cref="DefinitionBase.MaxDimension"/>.
/// </summary>
/// <param name="definitions">The collection of definitions from which to retrieve the span.</param>
/// <param name="index">The index of the first definition in the span.</param>
/// <param name="span">The number of definitions in the span.</param>
/// <returns>A buffer containing the specified span of row/column definitions.</returns>
private List <DefinitionBase> EnumerateNonAutoDefinitionsInSpanByMaxDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span)
{
var buffer = EnumerateDefinitionsInSpan(definitions, index, span, auto: false);
buffer.Sort(cmpByMaxDimension);
return(buffer);
}
/// <summary>
/// Prepares the grid's rows or columns for arrangement.
/// </summary>
/// <param name="definitions">The collection of row or column definitions to prepare for measurement.</param>
private void PrepareForArrange(IDefinitionBaseCollection definitions)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
def.AssumedUnitType = def.Dimension.GridUnitType;
}
}
/// <summary>
/// Measures the total amount of space which is occupied by non-star rows or columns in the specified collection.
/// </summary>
/// <param name="definitions">The collection of row or column definitions for which to calculate a used dimension.</param>
/// <returns>The total amount of space which is occupied by non-star columns in <paramref name="definitions"/>.</returns>
private Double CalculateUsedDimension(IDefinitionBaseCollection definitions)
{
var dimension = 0.0;
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
switch (def.AssumedUnitType)
{
case GridUnitType.Auto:
case GridUnitType.Pixel:
dimension += def.ActualDimension;
break;
}
}
return dimension;
}
/// <summary>
/// Prepares the grid's rows or columns for measurement.
/// </summary>
/// <param name="definitions">The collection of row or column definitions to prepare for measurement.</param>
/// <param name="infiniteDimension">A value indicating whether the constraint for this dimension is infinite.</param>
private void PrepareForMeasure(IDefinitionBaseCollection definitions, Boolean infiniteDimension)
{
for (int i = 0; i < definitions.Count; i++)
{
var def = definitions[i];
var dim = 0.0;
var dimMin = def.MinDimension;
var dimMax = Math.Max(dimMin, def.MaxDimension);
switch (def.Dimension.GridUnitType)
{
case GridUnitType.Auto:
def.AssumedUnitType = GridUnitType.Auto;
dim = Double.PositiveInfinity;
break;
case GridUnitType.Pixel:
def.AssumedUnitType = GridUnitType.Pixel;
dim = def.Dimension.Value;
dimMin = Math.Max(dimMin, Math.Min(dim, dimMax));
break;
case GridUnitType.Star:
def.AssumedUnitType = infiniteDimension ? GridUnitType.Auto : GridUnitType.Star;
dim = Double.PositiveInfinity;
break;
}
def.ResetContentDimension(dimMin);
def.MeasuredDimension = Math.Max(dimMin, Math.Min(dim, dimMax));
}
}
/// <summary>
/// Distributes the specified dimension amongst all of the cells in the specified row or column span.
/// </summary>
/// <param name="definitions">The collection of row or column definitions amongst which to distribute the specified dimension.</param>
/// <param name="index">The index of the first row or column in the span.</param>
/// <param name="span">The number of rows or columns in the span.</param>
/// <param name="dimension">The amount of space to distribute between the rows or columns in the span.</param>
private void DistributeSpanDimension(IDefinitionBaseCollection definitions, Int32 index, Int32 span, Double dimension)
{
if (dimension == 0.0)
{
return;
}
var spanContentDimension = 0.0;
var spanDesiredDimension = 0.0;
var spanMaximumDimension = 0.0;
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
spanContentDimension += def.MeasuredContentDimension;
spanDesiredDimension += def.PreferredDesiredDimension;
spanMaximumDimension += Math.Max(def.MaxDimension, spanContentDimension);
}
/* When the dimension to distribute is less than the current content
* size of the span, we don't need to do anything. */
if (dimension <= spanContentDimension)
{
return;
}
/* Dimension to distribute is less than the desired dimension of the span.
* Ignore auto defs, distribute equally into content sizes of other defs in order
* of lowest DesiredDimension to highest. */
if (dimension <= spanDesiredDimension)
{
var undistributed = dimension;
for (int i = 0; i < span; i++)
{
var def = definitions[index + i];
if (def.AssumedUnitType == GridUnitType.Auto)
{
undistributed -= def.MeasuredContentDimension;
}
}
var defsInSpan = EnumerateNonAutoDefinitionsInSpanByDesiredDimension(definitions, index, span);
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDistribution = undistributed / (defsInSpan.Count - i);
var defContentSize = Math.Min(defDistribution, def.PreferredDesiredDimension);
def.ExpandContentDimension(defContentSize);
undistributed -= defContentSize;
}
defsInSpan.Clear();
return;
}
/* Dimension to distribute is less than the maximum dimension of the span.
* Distribute into non-auto defs first, in order of lowest MaxSize to highest,
* then distribute any remaining space into auto defs. */
if (dimension <= spanMaximumDimension)
{
var undistributed = dimension - spanDesiredDimension;
var defsInSpan = EnumerateNonAutoDefinitionsInSpanByMaxDimension(definitions, index, span);
var autoInSpan = span - defsInSpan.Count;
// Non-auto defs
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDesiredSize = def.PreferredDesiredDimension;
var defDistribution = defDesiredSize + undistributed / (span - autoInSpan - i);
var defContentSize = Math.Min(defDistribution, def.MaxDimension);
def.ExpandContentDimension(defContentSize);
var delta = def.MeasuredContentDimension - defDesiredSize;
undistributed -= delta;
}
// Auto defs
defsInSpan = EnumerateAutoDefinitionsInSpanByContentDimension(definitions, index, span);
for (int i = 0; i < defsInSpan.Count; i++)
{
var def = defsInSpan[i];
var defDesiredSize = def.PreferredDesiredDimension;
var defDistribution = defDesiredSize + undistributed / (autoInSpan - i);
var defContentSize = Math.Min(defDistribution, def.MaxDimension);
def.ExpandContentDimension(defContentSize);
var delta = def.MeasuredContentDimension - defDesiredSize;
undistributed -= delta;
}
return;
}
/* Dimension to distribute is greater than the max size of the span.
* Distribute equally into all spans. */
for (int i = 0; i < span; i++)
{
definitions[index + i].ExpandContentDimension(dimension / span);
}
}
