protected override Vector2 DoMeasure(float width, MeasureMode widthMode, float height, MeasureMode heightMode)
{
GraphView graphView = GetFirstAncestorOfType <GraphView>();
VisualElement viewport = graphView.contentViewContainer;
contentRectInViewportSpace = Rect.zero;
// Compute the bounding box of the content of the scope in viewport space (because nodes are not parented by the scope that contains them)
foreach (GraphElement subElement in containedElements)
{
if (subElement.panel != panel)
{
continue;
}
if (subElement.parent == null)
{
continue;
}
Rect boundingRect = subElement.GetPosition();
if (Scope.IsValidRect(boundingRect))
{
boundingRect = subElement.parent.ChangeCoordinatesTo(viewport, boundingRect);
// Use the first element with a valid geometry as reference to compute the bounding box of contained elements
if (!Scope.IsValidRect(contentRectInViewportSpace))
{
contentRectInViewportSpace = boundingRect;
}
else
{
contentRectInViewportSpace = RectUtils.Encompass(contentRectInViewportSpace, boundingRect);
}
}
}
return(new Vector2(contentRectInViewportSpace.width, contentRectInViewportSpace.height));
}
void CalculateRects(VisualElement container)
{
if (graphView == null)
{
// Nothing to do in this case.
return;
}
m_ContentRect = graphView.CalculateRectToFitAll(container);
m_ContentRectLocal = m_ContentRect;
// Retrieve viewport rectangle as if zoom and pan were inactive
Matrix4x4 containerInvTransform = container.WorldTransformInverse();
Vector4 containerInvTranslation = containerInvTransform.GetColumn(3);
var containerInvScale = new Vector2(containerInvTransform.m00, containerInvTransform.m11);
m_ViewportRect = graphView.GetRect();
// Bring back viewport coordinates to (0,0), scale 1:1
m_ViewportRect.x += containerInvTranslation.x;
m_ViewportRect.y += containerInvTranslation.y;
var graphViewWB = graphView.worldBound;
m_ViewportRect.x += graphViewWB.x * containerInvScale.x;
m_ViewportRect.y += graphViewWB.y * containerInvScale.y;
m_ViewportRect.width *= containerInvScale.x;
m_ViewportRect.height *= containerInvScale.y;
// Update label with new value
var containerZoomFactor = container.worldTransform.m00;
SetZoomFactorText(String.Format(CultureInfo.InvariantCulture.NumberFormat, "{0:F2}", containerZoomFactor) + "x");
// Adjust rects for MiniMap
float effectiveWidth = layout.width - 1;
float effectiveHeight = layout.height - 1;
// Encompass viewport rectangle (as if zoom and pan were inactive)
var totalRect = RectUtils.Encompass(m_ContentRect, m_ViewportRect);
var minimapFactor = effectiveWidth / totalRect.width;
// Transform each rect to MiniMap coordinates
ChangeToMiniMapCoords(ref totalRect, minimapFactor, Vector3.zero);
var minimapTranslation = new Vector3(-totalRect.x, titleBarOffset - totalRect.y);
ChangeToMiniMapCoords(ref m_ViewportRect, minimapFactor, minimapTranslation);
ChangeToMiniMapCoords(ref m_ContentRect, minimapFactor, minimapTranslation);
// Diminish and center everything to fit vertically
if (totalRect.height > (effectiveHeight - titleBarOffset))
{
float totalRectFactor = (effectiveHeight - titleBarOffset) / totalRect.height;
float totalRectOffsetX = (effectiveWidth - (totalRect.width * totalRectFactor)) / 2.0f;
float totalRectOffsetY = titleBarOffset - ((totalRect.y + minimapTranslation.y) * totalRectFactor);
m_ContentRect.width *= totalRectFactor;
m_ContentRect.height *= totalRectFactor;
m_ContentRect.x *= totalRectFactor;
m_ContentRect.y *= totalRectFactor;
m_ContentRect.x += totalRectOffsetX;
m_ContentRect.y += totalRectOffsetY;
m_ViewportRect.width *= totalRectFactor;
m_ViewportRect.height *= totalRectFactor;
m_ViewportRect.x *= totalRectFactor;
m_ViewportRect.y *= totalRectFactor;
m_ViewportRect.x += totalRectOffsetX;
m_ViewportRect.y += totalRectOffsetY;
}
}