public long ComputeInfoCode(long offset)
{
int count = ChildCount;
long result = offset;
int index = 0;
for (int i = 0; i < count; i++)
{
View child = GetChildAt(i);
result = ComputeHash(result, (int)child.Visibility, index++);
ViewLayoutParams lp = (ViewLayoutParams)child.LayoutParameters;
result = ComputeHash(result, lp.Layer, index++);
result = ComputeHash(result, (int)lp.Gravity, index++);
result = ComputeHash(result, lp.Width, index++);
result = ComputeHash(result, lp.Height, index++);
result = ComputeHash(result, lp.LeftMargin, index++);
result = ComputeHash(result, lp.TopMargin, index++);
result = ComputeHash(result, lp.RightMargin, index++);
result = ComputeHash(result, lp.BottomMargin, index++);
}
return(result);
}
public ViewLayoutParams(ViewLayoutParams source) : base(source)
{
this.Gravity = source.Gravity;
this.Layer = source.Layer;
}
protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
long code = ComputeInfoCode((long)widthMeasureSpec + heightMeasureSpec);
if (code == viewInfoCode)
{
SetMeasuredDimension(MeasuredWidth, MeasuredHeight);
return;
}
viewInfoCode = code;
int paddingWidth = PaddingLeft + PaddingRight;
int paddingHeight = PaddingTop + PaddingBottom;
int smsw = MeasureUtils.MakeSelfMeasureSpec(widthMeasureSpec, paddingWidth);
int smsh = MeasureUtils.MakeSelfMeasureSpec(heightMeasureSpec, paddingHeight);
int smswnp = MeasureUtils.MakeSelfMeasureSpec(widthMeasureSpec, 0);
int smshnp = MeasureUtils.MakeSelfMeasureSpec(heightMeasureSpec, 0);
int contentWidth = 0;
int contentHeight = 0;
for (int i = 0; i < ChildCount; i++)
{
View child = GetChildAt(i);
if (child.Visibility == ViewStates.Gone)
{
continue;
}
ViewLayoutParams lp = (ViewLayoutParams)child.LayoutParameters;
int marginWidth = lp.LeftMargin + lp.RightMargin;
int marginHeight = lp.TopMargin + lp.BottomMargin;
int cmsw, cmsh;
switch (lp.Layer)
{
case ViewLayoutParams.LAYER_LEFT:
case ViewLayoutParams.LAYER_RIGHT:
case ViewLayoutParams.LAYER_TOP:
case ViewLayoutParams.LAYER_BOTTOM:
cmsw = MeasureUtils.MakeChildMeasureSpec(smswnp, lp.Width, marginWidth);
cmsh = MeasureUtils.MakeChildMeasureSpec(smshnp, lp.Height, marginHeight);
break;
default:
cmsw = MeasureUtils.MakeChildMeasureSpec(smsw, lp.Width, marginWidth);
cmsh = MeasureUtils.MakeChildMeasureSpec(smsh, lp.Height, marginHeight);
break;
}
child.Measure(cmsw, cmsh);
int cw = marginWidth + child.MeasuredWidth;
int ch = marginHeight + child.MeasuredHeight;
if (cw > contentWidth)
{
contentWidth = cw;
}
if (ch > contentHeight)
{
contentHeight = ch;
}
}
contentWidth += paddingWidth;
contentHeight += paddingHeight;
int width = MeasureUtils.GetMeasuredDimension(contentWidth, widthMeasureSpec);
int height = MeasureUtils.GetMeasuredDimension(contentHeight, heightMeasureSpec);
SetMeasuredDimension(width, height);
EdgeSize.SetEmpty();
CenterRect.Left = PaddingLeft;
CenterRect.Top = PaddingTop;
int centerWidth = Math.Max(MeasuredWidth - PaddingLeft - PaddingRight, 0);
int centerHeight = Math.Max(MeasuredHeight - PaddingTop - PaddingBottom, 0);
CenterRect.Right = CenterRect.Left + centerWidth;
CenterRect.Bottom = CenterRect.Top + centerHeight;
for (int i = 0; i < ChildCount; i++)
{
View child = GetChildAt(i);
if (child.Visibility == ViewStates.Gone)
{
continue;
}
ViewLayoutParams lp = (ViewLayoutParams)child.LayoutParameters;
int widthSpace = child.MeasuredWidth + lp.LeftMargin + lp.RightMargin;
int heightSpace = child.MeasuredHeight + lp.TopMargin + lp.BottomMargin;
switch (lp.Layer)
{
case ViewLayoutParams.LAYER_LEFT:
if (widthSpace > EdgeSize.Left)
{
EdgeSize.Left = widthSpace;
}
break;
case ViewLayoutParams.LAYER_TOP:
if (heightSpace > EdgeSize.Top)
{
EdgeSize.Top = heightSpace;
}
break;
case ViewLayoutParams.LAYER_RIGHT:
if (widthSpace > EdgeSize.Right)
{
EdgeSize.Right = widthSpace;
}
break;
case ViewLayoutParams.LAYER_BOTTOM:
if (heightSpace > EdgeSize.Bottom)
{
EdgeSize.Bottom = heightSpace;
}
break;
case ViewLayoutParams.LAYER_NONE:
case ViewLayoutParams.LAYER_CENTER:
default:
break;
}
}
}
