From 682c61305c9e850928233993e92526a0c74a06e8 Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Thu, 18 Dec 2025 14:42:21 +0200
Subject: [PATCH] chore(right_pane): basic collapse support

---
 .../widgets/sidebar/RightPanelContainer.css   |  4 ++
 .../widgets/sidebar/RightPanelContainer.tsx   | 41 +++++++++++++++++--
 .../src/widgets/sidebar/RightPanelWidget.tsx  | 26 ++++++++++--
 3 files changed, 63 insertions(+), 8 deletions(-)

diff --git a/apps/client/src/widgets/sidebar/RightPanelContainer.css b/apps/client/src/widgets/sidebar/RightPanelContainer.css
index 631480c1b..d737e9d52 100644
--- a/apps/client/src/widgets/sidebar/RightPanelContainer.css
+++ b/apps/client/src/widgets/sidebar/RightPanelContainer.css
@@ -13,5 +13,9 @@ body.experimental-feature-new-layout #right-pane {
         &:last-of-type {
             border-bottom: 0;
         }
+
+        &.collapsed .card-header > .bx {
+            transform: rotate(-90deg);
+        }
     }
 }
diff --git a/apps/client/src/widgets/sidebar/RightPanelContainer.tsx b/apps/client/src/widgets/sidebar/RightPanelContainer.tsx
index d3ec7e912..ef0af28f0 100644
--- a/apps/client/src/widgets/sidebar/RightPanelContainer.tsx
+++ b/apps/client/src/widgets/sidebar/RightPanelContainer.tsx
@@ -2,7 +2,8 @@
 import "./RightPanelContainer.css";
 
 import Split from "@triliumnext/split.js";
-import { useEffect } from "preact/hooks";
+import { createContext } from "preact";
+import { useEffect, useRef } from "preact/hooks";
 
 import options from "../../services/options";
 import { DEFAULT_GUTTER_SIZE } from "../../services/resizer";
@@ -10,6 +11,11 @@ import HighlightsList from "./HighlightsList";
 import TableOfContents from "./TableOfContents";
 
 const MIN_WIDTH_PERCENT = 5;
+const COLLAPSED_SIZE = 32;
+
+export const RightPanelContext = createContext({
+    setExpanded(cardEl: HTMLElement, expanded: boolean) {}
+});
 
 export default function RightPanelContainer() {
     // Split between right pane and the content pane.
@@ -32,19 +38,46 @@ export default function RightPanelContainer() {
     ];
 
     // Split between items.
+    const innerSplitRef = useRef<Split.Instance>(null);
     useEffect(() => {
         const rightPaneContainer = document.getElementById("right-pane");
         const elements = Array.from(rightPaneContainer?.children ?? []) as HTMLElement[];
-        console.log("Got ", elements);
         const splitInstance = Split(elements, {
-            direction: "vertical"
+            direction: "vertical",
+            minSize: COLLAPSED_SIZE,
+            gutterSize: 1
         });
+        innerSplitRef.current = splitInstance;
         return () => splitInstance.destroy();
     }, [ items ]);
 
     return (
         <div id="right-pane">
-            {items}
+            <RightPanelContext.Provider value={{
+                setExpanded(cardEl, expanded) {
+                    const splitInstance = innerSplitRef.current;
+                    if (!splitInstance) return;
+
+                    const rightPaneEl = document.getElementById("right-pane");
+                    const children = Array.from(rightPaneEl?.querySelectorAll(":scope > .card") ?? []);
+                    const pos = children.indexOf(cardEl);
+                    if (pos === -1) return;
+                    const sizes = splitInstance.getSizes();
+                    if (!expanded) {
+                        const sizeBeforeCollapse = sizes[pos];
+                        sizes[pos] = 0;
+                        const itemToExpand = pos > 0 ? pos - 1 : pos + 1;
+
+                        if (sizes[itemToExpand] > COLLAPSED_SIZE) {
+                            sizes[itemToExpand] += sizeBeforeCollapse;
+                        }
+                    }
+                    console.log("Set sizes to ", sizes);
+                    splitInstance.setSizes(sizes);
+                },
+            }}>
+                {items}
+            </RightPanelContext.Provider>
         </div>
     );
 }
diff --git a/apps/client/src/widgets/sidebar/RightPanelWidget.tsx b/apps/client/src/widgets/sidebar/RightPanelWidget.tsx
index 94a5cf04c..7f4391d6c 100644
--- a/apps/client/src/widgets/sidebar/RightPanelWidget.tsx
+++ b/apps/client/src/widgets/sidebar/RightPanelWidget.tsx
@@ -1,6 +1,10 @@
-import { useContext, useRef } from "preact/hooks";
-import { ParentComponent } from "../react/react_utils";
+import clsx from "clsx";
 import { ComponentChildren } from "preact";
+import { useContext, useRef, useState } from "preact/hooks";
+
+import Icon from "../react/Icon";
+import { ParentComponent } from "../react/react_utils";
+import { RightPanelContext } from "./RightPanelContainer";
 
 interface RightPanelWidgetProps {
     title: string;
@@ -9,6 +13,8 @@ interface RightPanelWidgetProps {
 }
 
 export default function RightPanelWidget({ title, buttons, children }: RightPanelWidgetProps) {
+    const rightPanelContext = useContext(RightPanelContext);
+    const [ expanded, setExpanded ] = useState(true);
     const containerRef = useRef<HTMLDivElement>(null);
     const parentComponent = useContext(ParentComponent);
 
@@ -17,15 +23,27 @@ export default function RightPanelWidget({ title, buttons, children }: RightPane
     }
 
     return (
-        <div ref={containerRef} class="card widget" style={{contain: "none"}}>
+        <div
+            ref={containerRef}
+            class={clsx("card widget", !expanded && "collapsed")}
+        >
             <div class="card-header">
+                <Icon
+                    icon="bx bx-chevron-down"
+                    onClick={() => {
+                        if (containerRef.current) {
+                            rightPanelContext.setExpanded(containerRef.current, !expanded);
+                        }
+                        setExpanded(!expanded);
+                    }}
+                />
                 <div class="card-header-title">{title}</div>
                 <div class="card-header-buttons">{buttons}</div>
             </div>
 
             <div id={parentComponent?.componentId} class="body-wrapper">
                 <div class="card-body">
-                    {children}
+                    {expanded && children}
                 </div>
             </div>
         </div>