private async Task <ElementPositionInfo> PositionElementRelativeAsync(double gap, Rectangle targetRect, Rectangle boundingRect)
{
//previous data... not implemented
//RTL ... not implemented
//GetPositionData()
PositionDirectionalHintData positionData = DirectionalDictionary[DirectionalHint];
//PositionDirectionalHintData alignmentData = null;
//GetAlignmentData()
if (positionData.IsAuto)
{
positionData.AlignmentEdge = GetClosestEdge(positionData.TargetEdge, targetRect, boundingRect);
}
positionData.AlignTargetEdge = AlignTargetEdge;
//Now calculate positionedElement
//GetRectangleFromElement()
var calloutRectangle = await JSRuntime.InvokeAsync <Rectangle>("BlazorFabricBaseComponent.measureElementRect", calloutReference);
//Debug.WriteLine($"Callout: {calloutRectangle.left}, {calloutRectangle.top}, {calloutRectangle.right}, {calloutRectangle.bottom}");
var positionedElement = PositionElementWithinBounds(calloutRectangle, targetRect, boundingRect, positionData, gap);
var elementPositionInfo = positionedElement.ToElementPositionInfo(targetRect);
return(elementPositionInfo);
}
private ElementPosition FlipToFit(Rectangle rect, Rectangle target, Rectangle bounding, PositionDirectionalHintData positionData, double gap = 0)
{
var currentEstimate = rect;
var currentEdge = positionData.TargetEdge;
var currentAlignment = positionData.AlignmentEdge;
List <RectangleEdge> directions = new List <RectangleEdge> {
RectangleEdge.Left, RectangleEdge.Right, RectangleEdge.Bottom, RectangleEdge.Top
};
for (var i = 0; i < 4; i++)
{
if (IsEdgeInBounds(currentEstimate, bounding, currentEdge))
{
directions.RemoveAt(directions.IndexOf(currentEdge));
if ((int)directions.IndexOf((RectangleEdge)((int)currentEdge * -1)) > -1)
{
currentEdge = (RectangleEdge)((int)currentEdge * -1);
}
else
{
currentAlignment = currentEdge;
currentEdge = directions[0];
}
currentEstimate = EstimatePosition(rect, target, new PositionDirectionalHintData(currentEdge, currentAlignment), gap);
}
else
{
return(new ElementPosition(currentEstimate, currentEdge, currentAlignment));
}
}
return(new ElementPosition(rect, positionData.TargetEdge, currentAlignment));
}
private Rectangle EstimatePosition(Rectangle elementToPosition, Rectangle target, PositionDirectionalHintData positionData, double gap = 0)
{
var elementEdge = this.CoverTarget ? positionData.TargetEdge : (RectangleEdge)((int)positionData.TargetEdge * -1);
Rectangle estimatedElementPosition = null;
estimatedElementPosition = this.CoverTarget
? AlignEdges(elementToPosition, target, positionData.TargetEdge, gap)
: AlignOppositeEdges(elementToPosition, target, positionData.TargetEdge, gap);
if (positionData.AlignmentEdge == RectangleEdge.None)
{
var targetMiddlePoint = GetCenterValue(target, positionData.TargetEdge);
estimatedElementPosition = CenterEdgeToPoint(estimatedElementPosition, elementEdge, targetMiddlePoint);
}
else
{
estimatedElementPosition = AlignEdges(estimatedElementPosition, target, positionData.AlignmentEdge);
}
return(estimatedElementPosition);
}
private ElementPosition AdjustFitWithinBounds(Rectangle element, Rectangle target, Rectangle bounding, PositionDirectionalHintData positionData, double gap = 0)
{
var alignmentEdge = positionData.AlignmentEdge;
var alignTargetEdge = positionData.AlignTargetEdge;
ElementPosition elementEstimate = new ElementPosition(element, positionData.TargetEdge, alignmentEdge);
if (!DirectionalHintFixed && !CoverTarget)
{
elementEstimate = FlipToFit(element, target, bounding, positionData, gap);
}
var outOfBounds = GetOutOfBoundsEdges(element, bounding);
if (alignTargetEdge)
{
// The edge opposite to the alignment edge might be out of bounds. Flip alignment to see if we can get it within bounds.
if (elementEstimate.AlignmentEdge != RectangleEdge.None && outOfBounds.IndexOf((RectangleEdge)((int)elementEstimate.AlignmentEdge * -1)) > -1)
{
var flippedElementEstimate = FlipAlignmentEdge(elementEstimate, target, gap);
if (IsRectangleWithinBounds(flippedElementEstimate.ElementRectangle, bounding))
{
return(flippedElementEstimate);
}
}
}
else
{
foreach (var direction in outOfBounds)
{
elementEstimate.ElementRectangle = AlignEdges(elementEstimate.ElementRectangle, bounding, direction);
}
}
return(elementEstimate);
}
private ElementPosition PositionElementWithinBounds(Rectangle elementToPosition, Rectangle target, Rectangle bounding, PositionDirectionalHintData positionData, double gap)
{
var estimatedElementPosition = EstimatePosition(elementToPosition, target, positionData, gap);
if (IsRectangleWithinBounds(estimatedElementPosition, bounding))
{
return(new ElementPosition(estimatedElementPosition, positionData.TargetEdge, positionData.AlignmentEdge));
}
else
{
return(AdjustFitWithinBounds(elementToPosition, target, bounding, positionData, gap));
}
}