refactor(界面重构): 支持三种主题

assets/webui/assets.go

@@ -18,10 +18,10 @@ import "embed"
 
 // FS WebUI嵌入静态文件
 //
-//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_util.js ofdgo_view.js ofdgo_wasm.js ofdgo_work.js wasm_exec.js
+//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_theme.js ofdgo_util.js ofdgo_view.js ofdgo_wasm.js ofdgo_work.js wasm_exec.js
 var FS embed.FS
 
 // NativeFS WebView嵌入静态文件
 //
-//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_util.js ofdgo_view.js
+//go:embed index.html ofdgo.css ofdgo.ico ofdgo.js ofdgo.json ofdgo.png ofdgo.svg ofdgo_edit.js ofdgo_font.js ofdgo_host.js ofdgo_print.js ofdgo_theme.js ofdgo_util.js ofdgo_view.js
 var NativeFS embed.FS

assets/webui/index.html

@@ -8,6 +8,7 @@
 	<link rel="manifest" href="./ofdgo.json">
 	<link rel="icon" type="image/x-icon" sizes="16x16 32x32 48x48 64x64 128x128 256x256" href="./ofdgo.ico">
 	<link rel="icon" type="image/svg+xml" href="./ofdgo.svg">
+	<script src="./ofdgo_theme.js"></script>
 	<link rel="stylesheet" href="./ofdgo.css">
 </head>
 <body>
@@ -16,6 +17,7 @@
 			<div id="documentTabs" class="document-tabs"></div>
 			<button id="documentNewTab" class="document-new-tab" type="button" title="新建"><span class="new-icon"></span></button>
 			<div class="document-title-drag"></div>
+			<button id="appearanceButton" class="app-appearance" type="button" title="设置"><span class="settings-icon"></span></button>
 			<button id="refreshAppButton" class="app-update" type="button" title="更新" hidden><span class="update-icon"></span></button>
 		</div>
 		<header class="toolbar-frame">
@@ -450,6 +452,17 @@
 				</div>
 			</form>
 		</dialog>
+		<dialog id="appearancePanel" class="form-dialog appearance-dialog">
+			<form method="dialog">
+				<div class="appearance-heading"><h2 id="appearanceTitle" class="form-title">设置</h2><button class="appearance-close" type="submit" title="关闭"><span class="close-icon"></span></button></div>
+				<div class="appearance-label">外观主题</div>
+				<div class="appearance-themes">
+					<button type="button" data-theme-choice="system"><span class="theme-system-icon"></span><span>系统</span></button>
+					<button type="button" data-theme-choice="light"><span class="theme-light-icon"></span><span>浅色</span></button>
+					<button type="button" data-theme-choice="dark"><span class="theme-dark-icon"></span><span>深色</span></button>
+				</div>
+			</form>
+		</dialog>
 		<dialog id="settingsPanel" class="form-dialog settings-dialog">
 			<form id="settingsForm">
 				<header class="settings-header">

assets/webui/ofdgo.js

@@ -192,6 +192,8 @@ function createDocumentState() {
 let state = createDocumentState();
 
 const el = {
+	appearanceButton: document.querySelector("#appearanceButton"),
+	appearancePanel: document.querySelector("#appearancePanel"),
 	printButton: document.querySelector("#printButton"),
 	printPanel: document.querySelector("#printPanel"),
 	documentTitleBar: document.querySelector("#documentTitleBar"),
@@ -711,8 +713,8 @@ const annotationFields = Object.fromEntries(["CreateForm", "CreateCancel", "Cont
 el.editorTools.addEventListener("scroll", () => fontPicker.position());
 
 const canvasEditor = new CanvasEditor(el.viewerPanel, {
-	textControls: [el.textAlign, el.textFont, el.textFontToggle, el.textFontAdd, el.textFontList, el.textSize, el.textColor, el.textLineHeight, el.textSpacing, el.textWrap, el.paragraphButton, el.paragraphPanel, textBackground, ...textFormatButtons, el.undoButton, el.redoButton, el.saveButton, el.saveAsButton, el.fontInput, document.querySelector("#textReflow")],
-	keepTextFocus: () => fontPicker.open || el.closePanel.open || el.paragraphPanel.open || canvasEditor.input?.fontDialog,
+	textControls: [el.appearanceButton, el.appearancePanel, el.textAlign, el.textFont, el.textFontToggle, el.textFontAdd, el.textFontList, el.textSize, el.textColor, el.textLineHeight, el.textSpacing, el.textWrap, el.paragraphButton, el.paragraphPanel, textBackground, ...textFormatButtons, el.undoButton, el.redoButton, el.saveButton, el.saveAsButton, el.fontInput, document.querySelector("#textReflow")],
+	keepTextFocus: () => el.appearancePanel.open || fontPicker.open || el.closePanel.open || el.paragraphPanel.open || canvasEditor.input?.fontDialog,
 	prepareTextCommit: flushEditorInputs,
 	onTextFormat: changeRangeFormat,
 	onRichInput: ensureRichInput,
@@ -2086,7 +2088,7 @@ function handleKeyDown(event) {
 
 function formDialogOpen() {
 	if (documentTab().print?.context) return true;
-	return Boolean(sealPreview || resourceManager.pick) || el.aboutPanel.open || el.closePanel.open || el.attachmentDialog.open || settingsElements.Panel.open || fontBindingElements.Panel.open || el.signPanel.open || el.verifyPanel.open || el.credentialsPanel.open || el.encryptionPanel.open || batchElements.Panel.open || el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open || el.paragraphPanel.open || el.importPanel.open || el.infoPanel.open || el.documentPanel.open
+	return el.appearancePanel.open || Boolean(sealPreview || resourceManager.pick) || el.aboutPanel.open || el.closePanel.open || el.attachmentDialog.open || settingsElements.Panel.open || fontBindingElements.Panel.open || el.signPanel.open || el.verifyPanel.open || el.credentialsPanel.open || el.encryptionPanel.open || batchElements.Panel.open || el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open || el.paragraphPanel.open || el.importPanel.open || el.infoPanel.open || el.documentPanel.open
 		|| resourceElements.Panel.open || el.structureDialog.open || el.versionPanel.open || el.batchPagesPanel.open || el.objectStylePanel.open || el.outlinePanel.open || el.objectBoundsPanel.open || el.annotationNote.open || el.annotationCreate.open || el.objectPicker.open;
 }
 
@@ -2638,9 +2640,6 @@ function applyTitleBarInfo(info) {
 	document.body.style.setProperty("--titlebar-height", `${info.height}px`);
 	el.documentTitleBar.style.setProperty("--titlebar-left", `${info.left}px`);
 	el.documentTitleBar.style.setProperty("--titlebar-right", `${info.right}px`);
-	for (const [name, value] of Object.entries(info.colors || {})) {
-		if (value) el.documentTitleBar.style.setProperty(`--titlebar-${name.replace(/[A-Z]/g, letter => `-${letter.toLowerCase()}`)}`, value);
-	}
 	el.documentTitleBar.dataset.active = String(info.active);
 	el.documentTitleBar.dataset.maximized = String(info.maximized);
 	revealPanelTab(el.documentTabs);
@@ -5502,6 +5501,14 @@ function resizeViewer() {
 }
 
 async function boot() {
+	window.ofdgoTheme.connect(nativeHost, error => showError(error, false));
+	el.appearanceButton.addEventListener("click", () => {
+		const bounds = el.appearanceButton.getBoundingClientRect();
+		el.appearancePanel.style.setProperty("--appearance-top", `${bounds.bottom + 4}px`);
+		el.appearancePanel.style.setProperty("--appearance-right", `${Math.max(12, innerWidth - bounds.right)}px`);
+		documentDialogs.showApplication(el.appearancePanel);
+	});
+	for (const button of el.appearancePanel.querySelectorAll("[data-theme-choice]")) button.addEventListener("click", () => window.ofdgoTheme.set(button.dataset.themeChoice));
 	documentDialogs = new DocumentDialogs({document, titlebar: el.documentTitleBar,
 		targets: () => [...document.body.children].filter(node => node !== el.documentTitleBar)});
 	for (const panel of document.querySelectorAll("dialog.form-dialog")) if (panel !== el.printPanel) documentDialogs.register(panel, {persistent: panel === batchElements.Panel});

assets/webui/ofdgo_theme.js

@@ -0,0 +1,42 @@
+(() => {
+	const root = document.documentElement;
+	const preference = matchMedia("(prefers-color-scheme: dark)");
+	const key = "ofdgo.theme";
+	let mode = root.dataset.themeMode || "system";
+	let host = null, report = null, pending = Promise.resolve();
+	if (!root.dataset.themeMode) {
+		try { mode = localStorage.getItem(key) || "system"; } catch {}
+	}
+	if (!["system", "light", "dark"].includes(mode)) mode = "system";
+	function apply() {
+		root.dataset.themeMode = mode;
+		root.dataset.theme = mode === "system" ? preference.matches ? "dark" : "light" : mode;
+		document.querySelector('meta[name="theme-color"]').content = root.dataset.theme === "dark" ? "#272e33" : "#fafbfc";
+		for (const button of document.querySelectorAll("[data-theme-choice]")) button.dataset.pressed = String(button.dataset.themeChoice === mode);
+	}
+	function sync() {
+		if (!host) return;
+		const value = {mode, dark: root.dataset.theme === "dark"};
+		pending = pending.then(() => host.call("appearance", value)).catch(error => report(error));
+	}
+	function set(value) {
+		mode = value;
+		apply();
+		if (!host) {
+			try { localStorage.setItem(key, mode); } catch {}
+		}
+		sync();
+	}
+	preference.addEventListener("change", () => {
+		if (mode !== "system") return;
+		apply();
+		sync();
+	});
+	window.addEventListener("storage", event => {
+		if (host || event.key !== key && event.key !== null) return;
+		mode = ["light", "dark"].includes(event.newValue) ? event.newValue : "system";
+		apply();
+	});
+	window.ofdgoTheme = {set, connect(value, onError) { host = value; report = onError; apply(); sync(); }};
+	apply();
+})();

assets/webui/ofdgo_util.js

@@ -4,7 +4,7 @@ export class DocumentDialogs {
 		this.backdrop = root.createElement("div");
 		this.backdrop.className = "document-dialog-backdrop";
 		this.backdrop.hidden = true;
-		Object.assign(this.backdrop.style, { position: "fixed", inset: "0", background: "rgb(31 36 40 / 18%)", zIndex: "1000" });
+		Object.assign(this.backdrop.style, { position: "fixed", inset: "0", background: "var(--backdrop)", zIndex: "1000" });
 		root.body.append(this.backdrop);
 		root.addEventListener("keydown", event => {
 			if (event.defaultPrevented || this.applicationOpen()) return;

assets/webui/ofdgo_work.js

@@ -1,6 +1,6 @@
 const CACHE_PREFIX = `ofdgo:${self.registration.scope}:app:`;
 const META_CACHE = `${CACHE_PREFIX}meta`;
-const ASSETS = ["./", "ofdgo.css", "ofdgo.ico", "ofdgo.js", "ofdgo.json", "ofdgo.png", "ofdgo.svg", "ofdgo.wasm", "ofdgo_edit.js", "ofdgo_font.js", "ofdgo_host.js", "ofdgo_print.js", "ofdgo_util.js", "ofdgo_view.js", "ofdgo_wasm.js", "ofdgo_work.js", "wasm_exec.js"]
+const ASSETS = ["./", "ofdgo.css", "ofdgo.ico", "ofdgo.js", "ofdgo.json", "ofdgo.png", "ofdgo.svg", "ofdgo.wasm", "ofdgo_edit.js", "ofdgo_font.js", "ofdgo_host.js", "ofdgo_print.js", "ofdgo_theme.js", "ofdgo_util.js", "ofdgo_view.js", "ofdgo_wasm.js", "ofdgo_work.js", "wasm_exec.js"]
 	.map((path) => new URL(path, self.registration.scope).href);
 const CLIENT_PREFIX = new URL("__client/", self.registration.scope).href;
 

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/go-text/typesetting v0.3.5
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20261010204837-88a7f6b56918
-	github.com/xiaoqidun/guigo v0.0.0-20261026011429-36a970cd3fb6
+	github.com/xiaoqidun/guigo v0.0.0-20261030035206-e08505cc8719
 	github.com/xiaoqidun/j2kgo v1.0.2
 	github.com/xiaoqidun/jbig2 v1.1.8
 	github.com/xiaoqidun/pdfgo v0.0.0-20261026125713-90454771d5d0

go.sum

@@ -60,8 +60,8 @@ github.com/tdewolff/parse/v2 v2.8.16 h1:bLk5svUOQRkW/Y2SJ+DeENSIkZBcTIkq+Atyv5D8
 github.com/tdewolff/parse/v2 v2.8.16/go.mod h1:XdsoSFThlVIRIajAuqz1evNY7bagZS8LBOPA3aVopwQ=
 github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
-github.com/xiaoqidun/guigo v0.0.0-20261026011429-36a970cd3fb6 h1:JqOQToWYKqyoIcvNx5MYfrdiuApjpBDnUjMHD7sCF6c=
-github.com/xiaoqidun/guigo v0.0.0-20261026011429-36a970cd3fb6/go.mod h1:bXz+dPMVntPIVwePTTuMXt8Q0z1YoUGuROQSsXyUEfY=
+github.com/xiaoqidun/guigo v0.0.0-20261030035206-e08505cc8719 h1:zTVHOkCXfL90vTCNEkKT95noDMTJ2QiA1SWbTcZb2ys=
+github.com/xiaoqidun/guigo v0.0.0-20261030035206-e08505cc8719/go.mod h1:bXz+dPMVntPIVwePTTuMXt8Q0z1YoUGuROQSsXyUEfY=
 github.com/xiaoqidun/j2kgo v1.0.2 h1:OAjjEOfaBaQzBNcj9wx+eM68UI5pewR6SzNZa1R1DIw=
 github.com/xiaoqidun/j2kgo v1.0.2/go.mod h1:DCwAfuDzCDYqUiAlZ7BDwigTjaXw7o9L1FtEma/D1aA=
 github.com/xiaoqidun/jbig2 v1.1.8 h1:dERPW7F8gs18a/DOD9gXHR3fP1Vl6KhCNsLnq5l3BIo=

internal/webview/webview.go

@@ -48,6 +48,9 @@ const applicationDownloadURL = "https://ofdgo.aite.me/releases/"
 
 // Host 连接桌面系统能力和共用文档业务
 type Host struct {
+	themeMu        sync.Mutex
+	theme          applicationTheme
+	themePath      string
 	mu             sync.Mutex
 	window         *guigo.Window
 	files          *fileStore
@@ -104,7 +107,11 @@ func Run(ctx context.Context, paths []string, dataDir string) error {
 			return err
 		}
 	}
-	h := &Host{pendingPaths: paths}
+	h := &Host{pendingPaths: paths, themePath: filepath.Join(options.UserDataDir, "appearance.json")}
+	if err := h.loadTheme(); err != nil {
+		return err
+	}
+	options.TitleBarColors = themeColors(h.theme.Dark)
 	data, err := json.Marshal(paths)
 	if err != nil {
 		return err
@@ -142,7 +149,7 @@ func Run(ctx context.Context, paths []string, dataDir string) error {
 	h.conversionPool = h.resources.ConversionPool()
 	defer h.close()
 	bindings := make(map[string]guigo.HandlerFunc)
-	for _, name := range []string{"engine.open", "engine.close", "engine.call", "engine.start", "engine.cancel", "engine.finish", "batch", "open", "save", "directory", "file", "release", "drop.release", "child", "remove", "write.begin", "write.data", "write.commit", "write.abort", "fonts", "ready", "launch.done", "title", "window.info", "window.drag", "window.close", "update.check", "update.open", "association.query", "association.register", "association.remove", "print.capabilities", "print.dialog", "print.printers", "print.query", "print.properties", "print"} {
+	for _, name := range []string{"engine.open", "engine.close", "engine.call", "engine.start", "engine.cancel", "engine.finish", "batch", "open", "save", "directory", "file", "release", "drop.release", "child", "remove", "write.begin", "write.data", "write.commit", "write.abort", "fonts", "ready", "launch.done", "title", "window.info", "window.drag", "window.close", "appearance", "update.check", "update.open", "association.query", "association.register", "association.remove", "print.capabilities", "print.dialog", "print.printers", "print.query", "print.properties", "print"} {
 		bindings["ofdgo.host."+name] = func(ctx context.Context, args any) (any, error) { return h.call(ctx, name, args) }
 	}
 	static := http.FileServerFS(webuiassets.NativeFS)
@@ -155,6 +162,18 @@ func Run(ctx context.Context, paths []string, dataDir string) error {
 			http.NotFound(w, r)
 			return
 		}
+		if r.URL.Path == "/" || r.URL.Path == "/index.html" {
+			data, err := h.themeIndex()
+			if err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			w.Header().Set("X-OFDGo-Build-Version", build.Version)
+			w.Header().Set("Cache-Control", "no-store")
+			w.Write(data)
+			return
+		}
 		w.Header().Set("Cache-Control", "no-store")
 		w.Header().Set("X-OFDGo-Build-Version", build.Version)
 		static.ServeHTTP(w, r)
@@ -237,7 +256,13 @@ func (h *Host) resource(r *http.Request) (*guigo.Resource, error) {
 		if name == "" {
 			name = "index.html"
 		}
-		data, err := webuiassets.NativeFS.ReadFile(name)
+		var data []byte
+		var err error
+		if name == "index.html" {
+			data, err = h.themeIndex()
+		} else {
+			data, err = webuiassets.NativeFS.ReadFile(name)
+		}
 		if err != nil {
 			return nil, nil
 		}
@@ -411,6 +436,8 @@ func (h *Host) call(ctx context.Context, name string, value any) (any, error) {
 	text := func(key string) string { value, _ := args[key].(string); return value }
 	flag := func(key string) bool { value, _ := args[key].(bool); return value }
 	switch name {
+	case "appearance":
+		return nil, h.setTheme(applicationTheme{Mode: text("mode"), Dark: flag("dark")})
 	case "print.capabilities", "print.dialog", "print.printers", "print.query", "print.properties", "print":
 		h.mu.Lock()
 		window := h.window
@@ -1186,22 +1213,17 @@ func windowOptions(dataDir string) (guigo.Options, error) {
 		return guigo.Options{}, err
 	}
 	return guigo.Options{
-		AppID:    appID,
-		Title:    "OFDGo - OFD编辑器",
-		TitleBar: guigo.TitleBarContent,
-		TitleBarColors: guigo.TitleBarColors{
-			Background:         "#e8edf0",
-			Foreground:         "#1f2428",
-			InactiveBackground: "#eef1f4",
-			InactiveForeground: "#66737f",
-		},
-		Icon:        icon,
-		Width:       1440,
-		Height:      900,
-		MinWidth:    360,
-		MinHeight:   240,
-		Center:      true,
-		Maximized:   true,
-		UserDataDir: dataDir,
+		AppID:          appID,
+		Title:          "OFDGo - OFD编辑器",
+		TitleBar:       guigo.TitleBarContent,
+		TitleBarColors: themeColors(false),
+		Icon:           icon,
+		Width:          1440,
+		Height:         900,
+		MinWidth:       360,
+		MinHeight:      240,
+		Center:         true,
+		Maximized:      true,
+		UserDataDir:    dataDir,
 	}, nil
 }

internal/webview/webview_theme.go

@@ -0,0 +1,130 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !js || !wasm
+
+package webview
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/xiaoqidun/guigo"
+	webuiassets "github.com/xiaoqidun/ofdgo/assets/webui"
+)
+
+// applicationTheme 保存应用主题偏好及最后一次解析的系统外观
+type applicationTheme struct {
+	Mode string `json:"mode"`
+	Dark bool   `json:"dark"`
+}
+
+// themeColors 返回应用对应外观的原生标题栏配色
+// 入参: dark 是否使用深色
+// 返回: guigo.TitleBarColors 标题栏配色
+func themeColors(dark bool) guigo.TitleBarColors {
+	if dark {
+		return guigo.TitleBarColors{Background: "#20272b", Foreground: "#e0e7eb", InactiveBackground: "#242b30", InactiveForeground: "#9aa8b1"}
+	}
+	return guigo.TitleBarColors{Background: "#e8edee", Foreground: "#263238", InactiveBackground: "#eef1f3", InactiveForeground: "#728087"}
+}
+
+// loadTheme 在创建窗口前读取用户目录中的主题偏好
+// 返回: error 读取或解析错误
+func (h *Host) loadTheme() error {
+	h.theme = applicationTheme{Mode: "system"}
+	data, err := os.ReadFile(h.themePath)
+	if os.IsNotExist(err) {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+	if err := json.Unmarshal(data, &h.theme); err != nil {
+		return err
+	}
+	return h.theme.validate()
+}
+
+// validate 检查应用主题及解析后的配色是否一致
+// 返回: error 偏好错误
+func (a applicationTheme) validate() error {
+	if a.Mode != "system" && a.Mode != "light" && a.Mode != "dark" {
+		return fmt.Errorf("主题无效")
+	}
+	if a.Mode == "light" && a.Dark || a.Mode == "dark" && !a.Dark {
+		return fmt.Errorf("主题配色无效")
+	}
+	return nil
+}
+
+// themeIndex 在页面首次绘制前提供当前主题偏好
+// 返回: []byte 页面内容, error 资源读取错误
+func (h *Host) themeIndex() ([]byte, error) {
+	data, err := webuiassets.NativeFS.ReadFile("index.html")
+	if err != nil {
+		return nil, err
+	}
+	h.themeMu.Lock()
+	mode := h.theme.Mode
+	h.themeMu.Unlock()
+	if mode == "" {
+		mode = "system"
+	}
+	return bytes.Replace(data, []byte(`<html lang="zh-CN">`), []byte(`<html lang="zh-CN" data-theme-mode="`+mode+`">`), 1), nil
+}
+
+// setTheme 串行保存应用偏好并同步当前窗口配色
+// 入参: value 已解析的主题偏好
+// 返回: error 校验、持久化或窗口更新错误
+func (h *Host) setTheme(value applicationTheme) error {
+	if err := value.validate(); err != nil {
+		return err
+	}
+	h.themeMu.Lock()
+	defer h.themeMu.Unlock()
+	h.mu.Lock()
+	window := h.window
+	h.mu.Unlock()
+	if window == nil {
+		return fmt.Errorf("窗口尚未就绪")
+	}
+	if h.theme != value {
+		data, err := json.Marshal(value)
+		if err != nil {
+			return err
+		}
+		file, err := os.CreateTemp(filepath.Dir(h.themePath), "appearance-*")
+		if err != nil {
+			return err
+		}
+		defer os.Remove(file.Name())
+		_, writeErr := file.Write(data)
+		closeErr := file.Close()
+		if writeErr != nil {
+			return writeErr
+		}
+		if closeErr != nil {
+			return closeErr
+		}
+		if err := os.Rename(file.Name(), h.themePath); err != nil {
+			return err
+		}
+		h.theme = value
+	}
+	return window.SetTitleBarColors(themeColors(value.Dark))
+}