From 15615e6789ae4eb121a6d0ac6ba607e74369bd6e Mon Sep 17 00:00:00 2001
From: bobzel <zzzman@gmail.com>
Date: Wed, 9 Sep 2020 16:57:25 -0400
Subject: several pdf fixes - clipping link anchors to bounds of container. 
 pdf box titles don't change based on zoom anymore.   can't zoom a pdf if not
 selected.  fixed scrolling of previews without scrolling targets.

---
 .../CollectionFreeFormLinkView.tsx                 | 30 +++++++++++++++++-----
 1 file changed, 24 insertions(+), 6 deletions(-)

(limited to 'src/client/views/collections/collectionFreeForm/CollectionFreeFormLinkView.tsx')

diff --git a/src/client/views/collections/collectionFreeForm/CollectionFreeFormLinkView.tsx b/src/client/views/collections/collectionFreeForm/CollectionFreeFormLinkView.tsx
index 3a2979696..417b4c1ff 100644
--- a/src/client/views/collections/collectionFreeForm/CollectionFreeFormLinkView.tsx
+++ b/src/client/views/collections/collectionFreeForm/CollectionFreeFormLinkView.tsx
@@ -103,8 +103,24 @@ export class CollectionFreeFormLinkView extends React.Component<CollectionFreeFo
             //         showLinks={action(() => { })}
             //     />, { x: 300, y: 300 });
         });
+
+
     }
 
+    visibleY = (el: any) => {
+        var rect = el.getBoundingClientRect(), top = rect.top, height = rect.height,
+            el = el.parentNode;
+        do {
+            rect = el.getBoundingClientRect();
+            if (top <= rect.bottom === false && getComputedStyle(el).overflow === "hidden") return rect.bottom;
+            // Check if the element is out of view due to a container scrolling
+            if ((top + height) <= rect.top && getComputedStyle(el).overflow === "hidden") return rect.top;
+            el = el.parentNode;
+        } while (el != document.body);
+        // Check its within the document viewport
+        return top;//top <= document.documentElement.clientHeight && getComputedStyle(document.documentElement).overflow === "hidden";
+    };
+
     @computed get renderData() {
         this._start;
         if (SnappingManager.GetIsDragging() || !this.props.A.ContentDiv || !this.props.B.ContentDiv || !this.props.LinkDocs.length) {
@@ -115,16 +131,18 @@ export class CollectionFreeFormLinkView extends React.Component<CollectionFreeFo
         const bcont = this.props.B.ContentDiv.getElementsByClassName("linkAnchorBox-cont");
         const a = (acont.length ? acont[0] : this.props.A.ContentDiv).getBoundingClientRect();
         const b = (bcont.length ? bcont[0] : this.props.B.ContentDiv).getBoundingClientRect();
-        const apt = Utils.closestPtBetweenRectangles(a.left, a.top, a.width, a.height,
-            b.left, b.top, b.width, b.height,
+        const atop = this.visibleY(this.props.A.ContentDiv);
+        const btop = this.visibleY(this.props.B.ContentDiv);
+        const apt = Utils.closestPtBetweenRectangles(a.left, atop, a.width, a.height,
+            b.left, btop, b.width, b.height,
             a.left + a.width / 2, a.top + a.height / 2);
-        const bpt = Utils.closestPtBetweenRectangles(b.left, b.top, b.width, b.height,
-            a.left, a.top, a.width, a.height,
+        const bpt = Utils.closestPtBetweenRectangles(b.left, btop, b.width, b.height,
+            a.left, atop, a.width, a.height,
             apt.point.x, apt.point.y);
         const pt1 = [apt.point.x, apt.point.y];
         const pt2 = [bpt.point.x, bpt.point.y];
-        const pt1vec = [pt1[0] - (a.left + a.width / 2), pt1[1] - (a.top + a.height / 2)];
-        const pt2vec = [pt2[0] - (b.left + b.width / 2), pt2[1] - (b.top + b.height / 2)];
+        const pt1vec = [pt1[0] - (a.left + a.width / 2), pt1[1] - (atop + a.height / 2)];
+        const pt2vec = [pt2[0] - (b.left + b.width / 2), pt2[1] - (btop + b.height / 2)];
         const pt1len = Math.sqrt((pt1vec[0] * pt1vec[0]) + (pt1vec[1] * pt1vec[1]));
         const pt2len = Math.sqrt((pt2vec[0] * pt2vec[0]) + (pt2vec[1] * pt2vec[1]));
         const ptlen = Math.sqrt((pt1[0] - pt2[0]) * (pt1[0] - pt2[0]) + (pt1[1] - pt2[1]) * (pt1[1] - pt2[1])) / 2;
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