protected override SizeRequest OnMeasure(double widthConstraint, double heightConstraint)
{
var contentMeasure = ContentHolder.Measure(widthConstraint, heightConstraint, MeasureFlags.IncludeMargins);
var drawerMeasure = DrawerHolder.Measure(widthConstraint, heightConstraint, MeasureFlags.IncludeMargins);
return(new SizeRequest(new Size
{
Width = contentMeasure.Request.Width + DrawerClosedWidth,
Height = Math.Max(contentMeasure.Request.Height, drawerMeasure.Request.Height)
},
new Size
{
Width = contentMeasure.Minimum.Width + DrawerClosedWidth,
Height = Math.Max(contentMeasure.Minimum.Height, drawerMeasure.Minimum.Height)
}));
}
protected override void LayoutChildren(double x, double y, double width, double height)
{
var isRTL = (DrawerPosition == DrawerPosition.Right) ||
(DrawerPosition == DrawerPosition.Default &&
(this as IVisualElementController).EffectiveFlowDirection.IsRightToLeft());
var drawerMeasure = DrawerHolder.Measure(width, height);
double drawerWidth = DrawerWidth != 0 ? DrawerWidth : drawerMeasure.Request.Width;
double drawerWidthOutBound = (drawerWidth - DrawerClosedWidth) * (1 - OpenRatio);
double drawerWidthInBound = drawerWidth - drawerWidthOutBound;
double startX = isRTL ? (x + width - (drawerWidthInBound)) : (x - drawerWidthOutBound);
LayoutChildIntoBoundingRegion(DrawerHolder, new Rectangle(startX, y, drawerWidth, height));
double contentWidth = DrawerMode == DrawerMode.Resize ? width - drawerWidthInBound : width;
double contentStartX = isRTL || DrawerMode == DrawerMode.Overlap ? x : (x + drawerWidthInBound);
LayoutChildIntoBoundingRegion(ContentHolder, new Rectangle(contentStartX, y, contentWidth, height));
}
