/* UpdateHeightFromWidth, given a width postions all elements in the grid
* and returns the height of the grid.
*
* @param width, a given width to constrain the grid
*
* @return height, the resulting height of the grid
*/
public override float HeightFromWidth(float width)
{
if (width <= 0 || Columns <= 0 && Columns > 20)
{
return(0);
}
List <FlexElement> elements = ActiveElements;
int n = elements.Count;
//Center grid anchor and pivots whilst positioning elements
DefaultAnchors();
DefaultPivot();
//Convert spacing from vw to pixels
Vector2 space = Screen.width * GridSpacing / 100;
float fullHeight = 0;
int cols = Columns;
int i = 0;
while (i < n)
{
//Fill row of elements
int colCount = 0;
float x = -width / 2;
float rowHeight = 0;
while (colCount < cols && i < n)
{
FlexElement flex = elements[i];
flex.gameObject.SetActive(true);
//Center anchors and pivot before positioning
flex.DefaultAnchors();
flex.DefaultPivot();
//Calculate width for grid element and set it
flex.Width = (width - (cols - 1) * space.x) / cols;
//If element is the heigher than the row update the row height
if (flex.Height > rowHeight)
{
rowHeight = flex.Height;
}
//Set position of grid element
float y = -1 * (fullHeight + flex.Height / 2);
flex.Pos = new Vector2(x + flex.Width / 2, y);
//Set anchor to top middle of grid and reset pivot
flex.SetAnchors(new Vector2(0.5f, 1), new Vector2(0.5f, 1));
flex.ResetPivot();
x += flex.Width + space.x;
i++;
colCount++;
}
fullHeight += (i == n ? 0 : space.y) + rowHeight;
}
//Restore anchors and pivot of grid
ResetAnchors();
ResetPivot();
return(fullHeight);
}
/* UpdateElements, repositions elements with respect to the scroll position.
*/
public void UpdateElements()
{
float width = ViewWidth;
float height = 0;
if (StaticHeaderElement != null)
{
//Header anchors and pivot to center
StaticHeaderElement.DefaultAnchors();
StaticHeaderElement.DefaultPivot();
//Resize and position header
StaticHeaderElement.Width = width;
StaticHeaderElement.Pos = new Vector2(0, -1 * (StaticHeaderElement.Height / 2));
StaticHeaderElement.SetAnchors(new Vector2(0.5f, 1), new Vector2(0.5f, 1));
StaticHeaderElement.ResetPivot();
height += StaticHeaderElement.Height;
}
// If HeaderElement is given
if (HeaderElement != null)
{
//Header anchors and pivot to center
HeaderElement.DefaultAnchors();
HeaderElement.DefaultPivot();
//Resize and position header
HeaderElement.Width = width;
//Header will not bounce at top
if (sPos > 0)
{
HeaderElement.Pos = new Vector2(0, -1 * (height + HeaderElement.Height / 2));
}
else
{
HeaderElement.Pos = new Vector2(0, -1 * (sPos + height + HeaderElement.Height / 2));
}
//Set header anchor to middle top and restore pivot
HeaderElement.SetAnchors(new Vector2(0.5f, 1), new Vector2(0.5f, 1));
HeaderElement.ResetPivot();
height += HeaderElement.Height;
}
//If BodyElement is given
if (BodyElement != null)
{
//Header anchors and pivot to center
BodyElement.DefaultAnchors();
BodyElement.DefaultPivot();
//Resize and position header
BodyElement.Width = width;
BodyElement.Pos = new Vector2(0, -1 * (sPos + height + BodyElement.Height / 2));
//Set body anchor to middle top and restore pivot
BodyElement.SetAnchors(new Vector2(0.5f, 1), new Vector2(0.5f, 1));
BodyElement.ResetPivot();
height += BodyElement.Height;
}
//Update content height
ContentHeight = height > ViewHeight ? height : ViewHeight;
}