protected override Size ArrangeOverride(Size arrangeBounds)
{
if (Orientation != Orientation.Horizontal)
{
throw new NotImplementedException("The WrapBreakPanel only supports horizontal orientation.");
}
Size currentLineSize = new Size();
double totalHeight = 0;
// Examine all the elements in this panel.
foreach (UIElement element in this.Children)
{
// Get the desired size of the element, but don't call Measure() again,
// or that will trigger the measure layout pass and MeasureOverride()!
Size desiredSize = element.DesiredSize;
// Check if the element fits in the line, if given its desired size.
if ((currentLineSize.Width + desiredSize.Width > arrangeBounds.Width) || (WrapBreakPanel.GetLineBreakBefore(element)))
{
// Switch to a new line because space has run out.
totalHeight += currentLineSize.Height;
currentLineSize = new Size();
}
// Make sure the line is as tall as its tallest element.
currentLineSize.Height = Math.Max(desiredSize.Height, currentLineSize.Height);
// Place the element on the line, giving it its desired size.
element.Arrange(new Rect(currentLineSize.Width, totalHeight,
element.DesiredSize.Width, element.DesiredSize.Height));
// Move over for the next element.
currentLineSize.Width += desiredSize.Width;
}
// Return the size this panel actually occupies.
totalHeight += currentLineSize.Height;
return(new Size(arrangeBounds.Width, totalHeight));
}
protected override Size MeasureOverride(Size constraint)
{
if (Orientation != Orientation.Horizontal)
{
throw new NotImplementedException("The WrapBreakPanel only supports horizontal orientation.");
}
Size currentLineSize = new Size();
Size panelSize = new Size();
// Examine all the elements in this panel.
foreach (UIElement element in this.Children)
{
// Get the desired size of the element.
element.Measure(constraint);
Size desiredSize = element.DesiredSize;
// Check if the element fits in the line, if given its desired size.
if ((currentLineSize.Width + desiredSize.Width > constraint.Width) || (WrapBreakPanel.GetLineBreakBefore(element)))
{
// Switch to a new line because space has run out.
panelSize.Height += currentLineSize.Height;
panelSize.Width = Math.Max(currentLineSize.Width, panelSize.Width);
currentLineSize = desiredSize;
// If the element is too wide to fit using the maximum width of the line,
// just give it a separate line.
if (desiredSize.Width > constraint.Width)
{
// Make the width of the element the new desired width.
panelSize.Width = Math.Max(desiredSize.Width, panelSize.Width);
}
}
else
{
// Add the element to the current line.
currentLineSize.Width += desiredSize.Width;
// Make sure the line is as tall as its tallest element.
currentLineSize.Height = Math.Max(desiredSize.Height, currentLineSize.Height);
}
}
// Return the size required to fit all elements.
// Ordinarily, this is the width of the constraint, and the height
// required to fit all the elements.
// However, if an element is wider than the width given to the panel,
// the desired width will be the width of that line.
panelSize.Width = Math.Max(currentLineSize.Width, panelSize.Width);
panelSize.Height += currentLineSize.Height;
return(panelSize);
}
