/*
* Align elements horizontally and return a canvas.
* Elements include Canvas and MathText.
*/
public AlignCanvas ArrangeHorizontalGroup(params FrameworkElement[] elements)
{
AlignCanvas board = new AlignCanvas();
// maxAlignDepth: the max depth from the top, where all nodes are to be aligned
double startWidth = 0, maxAlignDepth = 0;
// set each element's left margin
foreach (var element in elements)
{
AlignCanvas.SetLeft(element, startWidth);
if (element is MathText)
{
element.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
startWidth += element.DesiredSize.Width;
if (maxAlignDepth < element.DesiredSize.Height / 2)
{
maxAlignDepth = element.DesiredSize.Height / 2;
}
}
else
{
// it's a canvas.
startWidth += element.Width;
if (maxAlignDepth < (element as AlignCanvas).alignHeight)
{
maxAlignDepth = (element as AlignCanvas).alignHeight;
}
}
}
// set each element's top margin
double maxDepth = 0;
foreach (var element in elements)
{
if (element is MathText)
{
AlignCanvas.SetTop(element, maxAlignDepth - element.DesiredSize.Height / 2);
if (element.DesiredSize.Height + maxAlignDepth - element.DesiredSize.Height / 2 > maxDepth)
{
maxDepth = element.DesiredSize.Height + maxAlignDepth - element.DesiredSize.Height / 2;
}
}
else
{
AlignCanvas.SetTop(element, maxAlignDepth - (element as AlignCanvas).alignHeight);
if (element.Height + maxAlignDepth - (element as AlignCanvas).alignHeight > maxDepth)
{
maxDepth = element.Height + maxAlignDepth - (element as AlignCanvas).alignHeight;
}
}
board.Children.Add(element);
}
board.Width = startWidth;
board.Height = maxDepth;
board.alignHeight = maxAlignDepth;
return(board);
}
public AlignCanvas ArrangeVerticalGroup(params FrameworkElement[] elements)
{
AlignCanvas board = new AlignCanvas();
double startDepth = 0, maxWidth = 0;
// set each element's left margin
foreach (var element in elements)
{
AlignCanvas.SetTop(element, startDepth);
if (element is Rectangle) // fraction bar
{
board.alignHeight = startDepth;
}
if (element is MathText)
{
element.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
startDepth += element.DesiredSize.Height;
if (maxWidth < element.DesiredSize.Width)
{
maxWidth = element.DesiredSize.Width;
}
}
else
{
// it's a canvas or sth like that.
startDepth += element.Height;
if (maxWidth < element.Width)
{
maxWidth = element.Width;
}
}
}
// set each element's top margin
foreach (var element in elements)
{
if (element is MathText)
{
AlignCanvas.SetLeft(element, (maxWidth - element.DesiredSize.Width) / 2);
}
else
{
AlignCanvas.SetLeft(element, (maxWidth - element.Width) / 2);
}
board.Children.Add(element);
}
board.Height = startDepth;
board.Width = maxWidth;
if (board.alignHeight == 0)
{
board.alignHeight = startDepth;
}
return(board);
}