protected override void performLayout()
{
base.performLayout();
RenderBox child = this.firstChild;
List <float> xOffsets = new List <float>();
while (child != null)
{
FlexParentData childParentData = (FlexParentData)child.parentData;
xOffsets.Add(childParentData.offset.dx);
D.assert(child.parentData == childParentData);
child = childParentData.nextSibling;
}
xOffsets.Add(this.size.width);
this.onPerformLayout(xOffsets, this.size.width);
}
protected override void performLayout()
{
_hasCheckedLayoutWidth = false;
base.performLayout();
_hasCheckedLayoutWidth = true;
if (size.width <= constraints.maxWidth)
{
base.performLayout();
}
else
{
BoxConstraints childConstraints = constraints.copyWith(minWidth: 0.0f);
RenderBox child = null;
float currentHeight = 0.0f;
switch (verticalDirection)
{
case VerticalDirection.down:
child = firstChild;
break;
case VerticalDirection.up:
child = lastChild;
break;
}
while (child != null)
{
FlexParentData childParentData = child.parentData as FlexParentData;
child.layout(childConstraints, parentUsesSize: true);
switch (textDirection)
{
case TextDirection.ltr:
switch (mainAxisAlignment)
{
case MainAxisAlignment.center:
float midpoint = (constraints.maxWidth - child.size.width) / 2.0f;
childParentData.offset = new Offset(midpoint, currentHeight);
break;
case MainAxisAlignment.end:
childParentData.offset = new Offset(constraints.maxWidth - child.size.width,
currentHeight);
break;
default:
childParentData.offset = new Offset(0, currentHeight);
break;
}
break;
case TextDirection.rtl:
switch (mainAxisAlignment)
{
case MainAxisAlignment.center:
float midpoint = constraints.maxWidth / 2.0f - child.size.width / 2.0f;
childParentData.offset = new Offset(midpoint, currentHeight);
break;
case MainAxisAlignment.end:
childParentData.offset = new Offset(0, currentHeight);
break;
default:
childParentData.offset = new Offset(constraints.maxWidth - child.size.width,
currentHeight);
break;
}
break;
}
currentHeight += child.size.height;
switch (verticalDirection)
{
case VerticalDirection.down:
child = childParentData.nextSibling;
break;
case VerticalDirection.up:
child = childParentData.previousSibling;
break;
}
if (overflowButtonSpacing != null && child != null)
{
currentHeight += overflowButtonSpacing ?? 0;
}
}
size = constraints.constrain(new Size(constraints.maxWidth, currentHeight));
}
}
