private LinearLayoutBuilder StartFlowLayout(LinearLayoutDirection layoutDirection, LinearLayoutDirection?flowDirection = null)
{
var layout = builder.LinearLayout(layoutDirection, flowDirection);
layout.Flow = true;
return(layout);
}
/*
* Calculates transform matrix from layout coordinate system to view coordinate system.
*/
private static Matrix2d LayoutTransform(RectangleF bounds, LinearLayoutDirection layoutDirection, LinearLayoutDirection flowDirection)
{
switch (layoutDirection)
{
case LinearLayoutDirection.LeftRight:
switch (flowDirection)
{
case LinearLayoutDirection.TopBottom:
return(new Matrix2d());
case LinearLayoutDirection.BottomTop:
return(Matrix2d.Translation(0, bounds.Height) * Matrix2d.Stretch(1, -1));
}
break;
case LinearLayoutDirection.RightLeft:
switch (flowDirection)
{
case LinearLayoutDirection.TopBottom:
return(Matrix2d.Translation(bounds.Width, 0) * Matrix2d.Stretch(-1, 1));
case LinearLayoutDirection.BottomTop:
return(Matrix2d.Translation(bounds.Width, bounds.Height) * Matrix2d.Stretch(-1, -1));
}
break;
case LinearLayoutDirection.TopBottom:
switch (flowDirection)
{
case LinearLayoutDirection.LeftRight:
return(Matrix2d.Rotation(90) * Matrix2d.Stretch(1, -1));
case LinearLayoutDirection.RightLeft:
return(Matrix2d.Translation(bounds.Width, 0) * Matrix2d.Rotation(90));
}
break;
case LinearLayoutDirection.BottomTop:
switch (flowDirection)
{
case LinearLayoutDirection.LeftRight:
return(Matrix2d.Translation(0, bounds.Height) * Matrix2d.Rotation(-90));
case LinearLayoutDirection.RightLeft:
return(Matrix2d.Translation(bounds.Width, bounds.Height) * Matrix2d.Stretch(-1, 1) * Matrix2d.Rotation(-90));
}
break;
}
var message = $"Layout direction {layoutDirection} is not compatible with flow direction {flowDirection}";
throw new ArgumentException(message);
}
public LinearLayoutBuilder(LayoutBuilder layoutBuilder, LinearLayoutDirection layoutDirection, LinearLayoutDirection?flowDirection = null, RectangleF?bounds = null)
{
Assert.Argument(layoutBuilder, nameof(layoutBuilder)).NotNull();
flowDirection = flowDirection ?? DefaultFlowDirection(layoutDirection);
_layoutBuilder = layoutBuilder;
_maxSize = 0;
var layoutBounds = bounds ?? _layoutBuilder.OuterBounds;
_layoutBounds = new RectangleF(layoutBounds.Location, SizeF.Empty);
_layoutToView = LayoutTransform(layoutBounds, layoutDirection, flowDirection.Value);
_viewToLayout = _layoutToView.Inverted();
_layoutSpaceBounds = _viewToLayout.Transform(layoutBounds);
_layoutOrigin = _layoutSpaceBounds.Location;
}
private static LinearLayoutDirection DefaultFlowDirection(LinearLayoutDirection layoutDirection)
{
switch (layoutDirection)
{
case LinearLayoutDirection.LeftRight:
return(LinearLayoutDirection.TopBottom);
case LinearLayoutDirection.TopBottom:
return(LinearLayoutDirection.LeftRight);
case LinearLayoutDirection.RightLeft:
return(LinearLayoutDirection.TopBottom);
case LinearLayoutDirection.BottomTop:
return(LinearLayoutDirection.LeftRight);
default:
throw new ArgumentException("Unknown layout direction");
}
}
