1 files changed, 11 insertions, 7 deletions
diff --git a/src/client/views/nodes/ContentFittingDocumentView.tsx b/src/client/views/nodes/ContentFittingDocumentView.tsx
index 2565fd932..e15790c9d 100644
--- a/src/client/views/nodes/ContentFittingDocumentView.tsx
+++ b/src/client/views/nodes/ContentFittingDocumentView.tsx
@@ -47,8 +47,8 @@ interface ContentFittingDocumentViewProps {
 export class ContentFittingDocumentView extends React.Component<ContentFittingDocumentViewProps>{
     public get displayName() { return "DocumentView(" + this.props.Document?.title + ")"; } // this makes mobx trace() statements more descriptive
     private get layoutDoc() { return this.props.Document && Doc.Layout(this.props.Document); }
-    private get nativeWidth() { return NumCast(this.layoutDoc!.nativeWidth, this.props.PanelWidth()); }
-    private get nativeHeight() { return NumCast(this.layoutDoc!.nativeHeight, this.props.PanelHeight()); }
+    private get nativeWidth() { return NumCast(this.layoutDoc?.nativeWidth, this.props.PanelWidth()); }
+    private get nativeHeight() { return NumCast(this.layoutDoc?.nativeHeight, this.props.PanelHeight()); }
     private contentScaling = () => {
         const wscale = this.props.PanelWidth() / (this.nativeWidth ? this.nativeWidth : this.props.PanelWidth());
         if (wscale * this.nativeHeight > this.props.PanelHeight()) {
@@ -73,21 +73,25 @@ export class ContentFittingDocumentView extends React.Component<ContentFittingDo
     }
     private PanelWidth = () => this.nativeWidth && (!this.props.Document || !this.props.Document.fitWidth) ? this.nativeWidth * this.contentScaling() : this.props.PanelWidth();
     private PanelHeight = () => this.nativeHeight && (!this.props.Document || !this.props.Document.fitWidth) ? this.nativeHeight * this.contentScaling() : this.props.PanelHeight();
-    private getTransform = () => this.props.getTransform().translate(-this.centeringOffset, 0).scale(1 / this.contentScaling());
+    private getTransform = () => this.props.getTransform().translate(-this.centeringOffset, -this.centeringYOffset).scale(1 / this.contentScaling());
     private get centeringOffset() { return this.nativeWidth && (!this.props.Document || !this.props.Document.fitWidth) ? (this.props.PanelWidth() - this.nativeWidth * this.contentScaling()) / 2 : 0; }
+    private get centeringYOffset() { return Math.abs(this.centeringOffset) < 0.001 ? (this.props.PanelHeight() - this.nativeHeight * this.contentScaling()) / 2 : 0; }
 
-    @computed get borderRounding() { return StrCast(this.props.Document!.borderRounding); }
+    @computed get borderRounding() { return StrCast(this.props.Document?.borderRounding); }
 
     render() {
         TraceMobx();
-        return (<div className="contentFittingDocumentView" style={{ width: this.props.PanelWidth(), height: this.props.PanelHeight() }}>
+        return (<div className="contentFittingDocumentView" style={{
+            width: Math.abs(this.centeringYOffset) > 0.001 ? "auto" : this.props.PanelWidth(),
+            height: Math.abs(this.centeringOffset) > 0.0001 ? "auto" : this.props.PanelHeight()
+        }}>
             {!this.props.Document || !this.props.PanelWidth ? (null) : (
                 <div className="contentFittingDocumentView-previewDoc"
                     style={{
                         transform: `translate(${this.centeringOffset}px, 0px)`,
                         borderRadius: this.borderRounding,
-                        height: this.props.PanelHeight(),
-                        width: `${100 * (this.props.PanelWidth() - this.centeringOffset * 2) / this.props.PanelWidth()}%`
+                        height: Math.abs(this.centeringYOffset) > 0.001 ? `${100 * this.nativeHeight / this.nativeWidth * this.props.PanelWidth() / this.props.PanelHeight()}%` : this.props.PanelHeight(),
+                        width: Math.abs(this.centeringOffset) > 0.001 ? `${100 * (this.props.PanelWidth() - this.centeringOffset * 2) / this.props.PanelWidth()}%` : this.props.PanelWidth()
                     }}>
                     <DocumentView {...this.props}
                         Document={this.props.Document}