private void ApplyAlignment(Size mySize, IRenderElementStyle myStyle, IList <IRenderElement> children)
{
foreach (var item in children)
{
Point itemPos = item.Display.Region.MarginRect.Location;
Size marginSize = item.Display.Region.MarginSize;
switch (myStyle.Flex?.AlignItems ?? AlignItems.Default)
{
case AlignItems.End:
itemPos = IncCross(itemPos, CrossAxis(mySize) - CrossAxis(marginSize));
break;
case AlignItems.Center:
itemPos = IncCross(itemPos, (CrossAxis(mySize) - CrossAxis(marginSize)) / 2);
break;
case AlignItems.Stretch:
marginSize = SetCrossSize(marginSize, CrossAxis(mySize));
break;
}
item.Display.Region.SetMarginPosition(itemPos);
item.Display.Region.SetMarginSize(marginSize);
}
}
private void PositionChildren(Size mySize,
IRenderElementStyle myStyle,
IList <IRenderElement> children)
{
Point dest = new Point(0, 0);
foreach (var item in children)
{
item.Display.Region.SetMarginPosition(dest);
dest = IncMain(dest, MainAxis(item.Display.Region.MarginSize));
}
}
public void PerformLayout(
IUserInterfaceRenderContext renderContext,
Size mySize,
IRenderElementStyle myStyle,
IList <IRenderElement> children)
{
int idealSizeOfAllChildren = CalcChildrenIdealSizes(renderContext, mySize, children);
int extraSpace = MainAxis(mySize) - idealSizeOfAllChildren;
GrowFlexItems(children, ref extraSpace);
ContractItems(children, mySize, ref extraSpace);
PositionChildren(mySize, myStyle, children);
ApplyAlignment(mySize, myStyle, children);
DistributeExtraSpace(myStyle, children, ref extraSpace);
}
private void DistributeExtraSpace(IRenderElementStyle myStyle,
IList <IRenderElement> children,
ref int extraSpace)
{
if (extraSpace <= 0)
{
return;
}
switch (myStyle.Flex?.JustifyContent ?? JustifyContent.Default)
{
case JustifyContent.Center:
foreach (var item in children)
{
item.Display.MarginRect = IncMain(item.Display.MarginRect, extraSpace / 2);
}
break;
case JustifyContent.End:
foreach (var item in children)
{
item.Display.MarginRect = IncMain(item.Display.MarginRect, extraSpace);
}
break;
case JustifyContent.SpaceBetween:
DistributeSpaceBetween(children, extraSpace);
break;
case JustifyContent.SpaceAround:
DistributeSpaceAround(children, extraSpace);
break;
case JustifyContent.SpaceEvenly:
DistributeSpaceEvenly(children, extraSpace);
break;
}
extraSpace = 0;
}
/// <summary>
/// Constructs a WidgetLayout structure.
/// </summary>
/// <param name="activeStyle"></param>
public RenderElementRegion(IRenderElementStyle activeStyle)
{
this.Style = activeStyle;
}
