From 691077df7a4918cce6dcb839f133833bd2587ca8 Mon Sep 17 00:00:00 2001
From: NriotHrreion <nriot233@outlook.com>
Date: Mon, 1 Jan 2024 20:13:15 +0800
Subject: [PATCH] feat: Add sash resizer

---
 public/index.html                |  1 +
 src/components/Sash.tsx          | 97 ++++++++++++++++++++++++++++++++
 src/components/sidebar/index.tsx | 13 ++++-
 src/style/layout.less            | 16 ++++++
 src/style/sidebar.less           |  5 +-
 5 files changed, 130 insertions(+), 2 deletions(-)
 create mode 100644 src/components/Sash.tsx

diff --git a/public/index.html b/public/index.html
index b08748d..061b2ee 100644
--- a/public/index.html
+++ b/public/index.html
@@ -14,6 +14,7 @@
     <noscript>You need to enable JavaScript to run this app.</noscript>
     <div id="root"></div>
     <div id="dialogs"></div>
+    <div className="sash-container" id="sashes"></div>
     <script src="https://unpkg.com/hidpi-canvas@1.0.10/dist/hidpi-canvas.min.js"></script>
   </body>
 </html>
diff --git a/src/components/Sash.tsx b/src/components/Sash.tsx
new file mode 100644
index 0000000..42d4f30
--- /dev/null
+++ b/src/components/Sash.tsx
@@ -0,0 +1,97 @@
+/* eslint-disable @typescript-eslint/no-unused-expressions */
+/* eslint-disable react-hooks/exhaustive-deps */
+import React, { useState, useEffect, useRef, useId } from "react";
+
+import Utils from "@/utils/Utils";
+
+interface SashProps {
+    direction: "vertical" | "horizontal"
+    defaultValue: number
+    minValue?: number
+    maxValue?: number
+    side: "left" | "right" | "top" | "bottom"
+    disabled?: boolean
+    onChange?: (value: number) => void
+}
+
+const Sash: React.FC<SashProps> = (props) => {
+    const [isHovered, setIsHovered] = useState<boolean>(false);
+    const [isMoving, setIsMoving] = useState<boolean>(false);
+    const id = useRef(useId());
+    const timer = useRef<NodeJS.Timeout | null>();
+
+    const handleMouseOver = () => {
+        if(props.disabled || timer.current) return;
+
+        timer.current = setTimeout(() => {
+            setIsHovered(true);
+        }, 350);
+    };
+
+    const handleMouseOut = () => {
+        if(props.disabled || isMoving) return;
+        
+        setIsHovered(false);
+        clearTimeout(timer.current ?? 0);
+        timer.current = null;
+    };
+
+    const handleMouseDown = () => {
+        if(props.disabled) return;
+
+        setIsHovered(true);
+        setIsMoving(true);
+    };
+
+    useEffect(() => {
+        window.addEventListener("mousemove", async (e: MouseEvent) => {
+            if(props.disabled || !(await Utils.getCurrentState(setIsMoving))) return;
+
+            var newValue = props.direction === "vertical" ? e.clientX : e.clientY;
+            if(
+                props.minValue &&
+                props.minValue >= newValue
+            ) newValue = props.minValue;
+            if(
+                props.maxValue &&
+                props.maxValue <= newValue
+            ) newValue = props.maxValue;
+
+            const elem = Utils.getElem("sash--"+ id.current);
+            elem.style[props.side] = newValue +"px";
+            // Do a repaint so that the update of page will
+            // be able to keep up with the update of CSS.
+            // Thanks to ChatGPT....
+            elem.style.display = "none";
+            elem.offsetHeight; // trigger a repaint
+            elem.style.display = "";
+            if(props.onChange) props.onChange(newValue);
+        });
+        window.addEventListener("mouseup", (e) => {
+            if(props.disabled || (e.target as HTMLElement).id !== "sash--"+ id.current) setIsHovered(false);
+            setIsMoving(false);
+        });
+    }, []);
+
+    useEffect(() => {
+        if(isHovered) {
+            document.body.style.cursor = props.direction === "vertical" ? "ew-resize" : "ns-resize";
+        } else {
+            document.body.style.cursor = "";
+        }
+    }, [isHovered]);
+
+    useEffect(() => {
+        Utils.getElem("sash--"+ id.current).style[props.side] = props.defaultValue +"px";
+    }, [props.disabled]);
+
+    return <div
+        className={"sash "+ props.direction + (isHovered ? " hover" : "")}
+        id={"sash--"+ id.current}
+        style={{ [props.side]: props.defaultValue - 2 }}
+        onMouseOver={() => handleMouseOver()}
+        onMouseOut={() => handleMouseOut()}
+        onMouseDown={() => handleMouseDown()}/>;
+}
+
+export default Sash;
diff --git a/src/components/sidebar/index.tsx b/src/components/sidebar/index.tsx
index d726f63..36033a5 100644
--- a/src/components/sidebar/index.tsx
+++ b/src/components/sidebar/index.tsx
@@ -7,6 +7,7 @@ import KeepAlive from "react-activation";
 import ModeButton from "@/components/sidebar/ModeButton";
 import History from "@/components/sidebar/History";
 import FunctionList from "@/components/sidebar/FunctionList";
+import Sash from "@/components/Sash";
 
 import { Mode, Theme } from "@/types";
 import { version } from "@/global";
@@ -25,6 +26,7 @@ import ProgrammingIcon from "@/icons/programming_mode.svg";
 const Sidebar: React.FC = () => {
     const { mode } = useContext(MainContext);
     const [sidebarOpen, setSidebarOpen] = useState<boolean>(!Utils.isMobile());
+    const [width, setWidth] = useState<number>(382);
     const themeValue = Storage.get().getItem("theme", useThemeDetector());
 
     const handleToggle = (isActive: boolean) => {
@@ -63,7 +65,7 @@ const Sidebar: React.FC = () => {
     }, [sidebarOpen]);
 
     return (
-        <aside className={"sidebar-container"+ (sidebarOpen ? " open" : "")}>
+        <aside className={"sidebar-container"+ (sidebarOpen ? " open" : "")} style={{ width }}>
             <div className="control-panel-container">
                 {/* Mobile only */}
                 {Utils.isMobile() && (
@@ -110,6 +112,15 @@ const Sidebar: React.FC = () => {
             </div>
             
             {layoutSwitch(mode)}
+
+            <Sash
+                direction="vertical"
+                defaultValue={width}
+                minValue={315}
+                maxValue={620}
+                side="left"
+                disabled={mode === Mode.GRAPHING}
+                onChange={(value) => setWidth(value)}/>
         </aside>
     );
 }
diff --git a/src/style/layout.less b/src/style/layout.less
index 7596551..e32c14e 100644
--- a/src/style/layout.less
+++ b/src/style/layout.less
@@ -87,3 +87,19 @@ kbd {
     box-shadow: 1px 1px 10px 2px rgba(0, 0, 0, .1);
     z-index: 100;
 }
+
+.sash {
+    position: absolute;
+    transition: all 100ms ease;
+    z-index: 1;
+    @size: 4px;
+    &.vertical {
+        width: @size;
+    }
+    &.horizontal {
+        height: @size;
+    }
+    &.hover {
+        background-color: var(--ca-blue1);
+    }
+}
diff --git a/src/style/sidebar.less b/src/style/sidebar.less
index 667d4bb..8ef18fa 100644
--- a/src/style/sidebar.less
+++ b/src/style/sidebar.less
@@ -1,7 +1,7 @@
 .sidebar-container {
-    flex: 1;
     display: flex;
     flex-direction: row;
+    min-width: 315px;
     .control-panel-container {
         display: flex;
         flex-direction: column;
@@ -271,4 +271,7 @@
             }
         }
     }
+    .sash {
+        height: calc(100% - 26px);
+    }
 }