public void AddChild(FlexItem item)
{
this.flexItems.Add(item);
}
public void Arrange()
{
int j = flexItems.Count;
float curX = 0;
float curY = 0;
float availableW = AvaliableParentWidth;
for (int i = 0; i < j; ++i)
{
FlexItem flexItem = flexItems[i];
CssBox box = flexItem.Box;
box.SetLocation(curX, curY);
curX += flexItem.PlanWidth;
}
//-----------------------------------------------
if (curX < availableW)
{
//find box that can expand
List <FlexItem> widthResizableItems = new List <FlexItem>();
for (int i = 0; i < j; ++i)
{
FlexItem flexItem = flexItems[i];
if (!flexItem.ReachMaxHeight)
{
widthResizableItems.Add(flexItem);
}
}
//remain some space
//so expand it
if ((j = widthResizableItems.Count) > 0)
{
//how to expand it
//1. check grow feature
int totalExpandCount = 0;
for (int i = j - 1; i >= 0; --i)
{
totalExpandCount += widthResizableItems[i].FlexGrow;
}
if (totalExpandCount > 0)
{
float remainingW = availableW - curX;
float onePart = remainingW / totalExpandCount;
//add to plan width
for (int i = j - 1; i >= 0; --i)
{
widthResizableItems[i].PlanWidth += (onePart * widthResizableItems[i].FlexGrow);
}
//then rearrange the line again
curX = 0;//reset
for (int i = 0; i < j; ++i)
{
FlexItem flexItem = flexItems[i];
CssBox box = flexItem.Box;
box.SetLocation(curX, curY);
box.SetVisualSize(flexItem.PlanWidth, flexItem.PlanHeight);
curX += flexItem.PlanWidth;
}
}
}
}
else if (curX > availableW)
{
//use more than available width
//find if it can shrink?
}
this.LineWidthAfterArrange = curX;
//-----------------------------------------------
//check for height
float maxHeight = 0;
for (int i = flexItems.Count - 1; i >= 0; --i)
{
FlexItem flexItem = flexItems[i];
CssBox box = flexItem.Box;
if (maxHeight < box.VisualHeight)
{
maxHeight = box.VisualHeight;
}
}
if (maxHeight < this.AvaliableParentHeight)
{
//expand item or shrink
if (this.flexCssBox.Height.IsEmptyOrAuto)
{
//autoheight
//then set new height for parent
this.LineHeightAfterArrange = maxHeight;
}
else
{
//try expand flex item
for (int i = flexItems.Count - 1; i >= 0; --i)
{
FlexItem flexItem = flexItems[i];
if (!flexItem.ReachMaxHeight)
{
flexItem.Box.SetVisualHeight(this.AvaliableParentHeight);
}
}
this.LineHeightAfterArrange = this.AvaliableParentHeight;
}
}
}
public void AddChild(FlexItem item)
{
this.flexItems.Add(item);
}