first

main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/dialog"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+// Note 笔记数据结构
+type Note struct {
+	ID        string    `json:"id"`
+	Title     string    `json:"title"`
+	Content   string    `json:"content"`
+	Tags      []string  `json:"tags"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// NoteStore 笔记存储管理
+type NoteStore struct {
+	notes  []Note
+	path   string
+	app    fyne.App
+	window fyne.Window
+}
+
+func NewNoteStore(app fyne.App, window fyne.Window) *NoteStore {
+	home, _ := os.UserHomeDir()
+	path := filepath.Join(home, ".goknow", "notes.json")
+	os.MkdirAll(filepath.Dir(path), 0755)
+
+	store := &NoteStore{
+		app:    app,
+		window: window,
+		path:   path,
+	}
+	store.Load()
+	return store
+}
+
+func (s *NoteStore) Load() {
+	data, err := os.ReadFile(s.path)
+	if err != nil {
+		s.notes = []Note{}
+		return
+	}
+	json.Unmarshal(data, &s.notes)
+}
+
+func (s *NoteStore) Save() {
+	data, _ := json.MarshalIndent(s.notes, "", "  ")
+	os.WriteFile(s.path, data, 0644)
+}
+
+func (s *NoteStore) Add(note Note) {
+	s.notes = append(s.notes, note)
+	s.Save()
+}
+
+func (s *NoteStore) Update(id string, title, content string, tags []string) {
+	for i := range s.notes {
+		if s.notes[i].ID == id {
+			s.notes[i].Title = title
+			s.notes[i].Content = content
+			s.notes[i].Tags = tags
+			s.notes[i].UpdatedAt = time.Now()
+			s.Save()
+			return
+		}
+	}
+}
+
+func (s *NoteStore) Delete(id string) {
+	for i := range s.notes {
+		if s.notes[i].ID == id {
+			s.notes = append(s.notes[:i], s.notes[i+1:]...)
+			s.Save()
+			return
+		}
+	}
+}
+
+func (s *NoteStore) Search(query string) []Note {
+	if query == "" {
+		// 按更新时间排序
+		sort.Slice(s.notes, func(i, j int) bool {
+			return s.notes[i].UpdatedAt.After(s.notes[j].UpdatedAt)
+		})
+		return s.notes
+	}
+
+	var results []Note
+	query = strings.ToLower(query)
+	for _, note := range s.notes {
+		if strings.Contains(strings.ToLower(note.Title), query) ||
+			strings.Contains(strings.ToLower(note.Content), query) ||
+			containsTag(note.Tags, query) {
+			results = append(results, note)
+		}
+	}
+	return results
+}
+
+func containsTag(tags []string, query string) bool {
+	for _, tag := range tags {
+		if strings.Contains(strings.ToLower(tag), query) {
+			return true
+		}
+	}
+	return false
+}
+
+// UI 组件
+type NoteApp struct {
+	store      *NoteStore
+	window     fyne.Window
+	noteList   *widget.List
+	searchBox  *widget.Entry
+	titleEntry *widget.Entry
+	content    *widget.Entry
+	tagsEntry  *widget.Entry
+	preview    *widget.RichText
+	currentID  string
+	notes      []Note
+}
+
+func NewNoteApp(app fyne.App) *NoteApp {
+	window := app.NewWindow("GoKnow - 知识管理")
+	window.Resize(fyne.NewSize(1200, 800))
+	window.CenterOnScreen()
+
+	noteApp := &NoteApp{
+		window: window,
+	}
+	noteApp.store = NewNoteStore(app, window)
+	noteApp.setupUI()
+	return noteApp
+}
+
+func (a *NoteApp) setupUI() {
+	// 左侧边栏 - 搜索和列表
+	a.searchBox = widget.NewEntry()
+	a.searchBox.SetPlaceHolder("🔍 搜索笔记、标签...")
+	a.searchBox.OnChanged = func(s string) {
+		a.refreshList()
+	}
+
+	// 新建按钮
+	newBtn := widget.NewButtonWithIcon("新建笔记", theme.ContentAddIcon(), func() {
+		a.createNewNote()
+	})
+	newBtn.Importance = widget.HighImportance
+
+	// 笔记列表
+	a.noteList = widget.NewList(
+		func() int { return len(a.notes) },
+		func() fyne.CanvasObject {
+			title := widget.NewLabel("Title")
+			timeLabel := widget.NewLabel("Time")
+			return container.NewBorder(
+				nil, nil,
+				widget.NewIcon(theme.DocumentIcon()),
+				timeLabel,
+				title,
+			)
+		},
+		func(i widget.ListItemID, o fyne.CanvasObject) {
+			note := a.notes[i]
+			box := o.(*fyne.Container)
+
+			// The structure from NewBorder with (top, bottom, left, right, center) is:
+			// Objects[0]: center (title), Objects[1]: left (icon), Objects[2]: right (timeLabel)
+			title := box.Objects[0].(*widget.Label)
+			title.SetText(note.Title)
+			if note.Title == "" {
+				title.SetText("无标题")
+			}
+
+			timeLabel := box.Objects[2].(*widget.Label)
+			timeLabel.SetText(formatTime(note.UpdatedAt))
+			timeLabel.TextStyle = fyne.TextStyle{Italic: true}
+		},
+	)
+
+	a.noteList.OnSelected = func(id widget.ListItemID) {
+		if id < len(a.notes) {
+			a.loadNote(a.notes[id])
+		}
+	}
+
+	sidebar := container.NewBorder(
+		container.NewVBox(a.searchBox, newBtn),
+		nil, nil, nil,
+		a.noteList,
+	)
+
+	// 右侧编辑器
+	a.titleEntry = widget.NewEntry()
+	a.titleEntry.SetPlaceHolder("笔记标题")
+	a.titleEntry.TextStyle = fyne.TextStyle{Bold: true}
+
+	a.tagsEntry = widget.NewEntry()
+	a.tagsEntry.SetPlaceHolder("标签: 用逗号分隔, 如: go, 编程, 笔记")
+
+	a.content = widget.NewMultiLineEntry()
+	a.content.SetPlaceHolder("在此输入 Markdown 内容...\n\n支持:\n- 标题\n- **粗体**\n- *斜体*\n- `代码`\n- [链接](url)")
+	a.content.Wrapping = fyne.TextWrapWord
+
+	// 预览区域
+	a.preview = widget.NewRichText()
+	a.preview.Wrapping = fyne.TextWrapWord
+
+	// 工具栏
+	saveBtn := widget.NewButtonWithIcon("保存", theme.DocumentSaveIcon(), func() {
+		a.saveCurrentNote()
+	})
+	saveBtn.Importance = widget.HighImportance
+
+	deleteBtn := widget.NewButtonWithIcon("删除", theme.DeleteIcon(), func() {
+		a.deleteCurrentNote()
+	})
+
+	toolbar := container.NewHBox(saveBtn, deleteBtn, layout.NewSpacer())
+
+	// 编辑器容器
+	editor := container.NewBorder(
+		container.NewVBox(
+			a.titleEntry,
+			widget.NewSeparator(),
+			a.tagsEntry,
+			widget.NewSeparator(),
+			toolbar,
+		),
+		nil, nil, nil,
+		container.NewHSplit(
+			a.content,
+			container.NewScroll(a.preview),
+		),
+	)
+
+	// 主布局
+	split := container.NewHSplit(sidebar, editor)
+	split.Offset = 0.3
+
+	a.window.SetContent(split)
+
+	// 实时预览
+	a.content.OnChanged = func(s string) {
+		a.updatePreview(s)
+	}
+
+	// 初始加载
+	a.refreshList()
+	if len(a.notes) > 0 {
+		a.noteList.Select(0)
+	} else {
+		a.createNewNote()
+	}
+}
+
+func (a *NoteApp) createNewNote() {
+	note := Note{
+		ID:        fmt.Sprintf("%d", time.Now().UnixNano()),
+		CreatedAt: time.Now(),
+		UpdatedAt: time.Now(),
+	}
+	a.store.Add(note)
+	a.refreshList()
+	a.selectNoteByID(note.ID)
+	a.titleEntry.SetText("")
+	a.content.SetText("")
+	a.tagsEntry.SetText("")
+	a.currentID = note.ID
+	a.updatePreview("")
+}
+
+func (a *NoteApp) loadNote(note Note) {
+	a.currentID = note.ID
+	a.titleEntry.SetText(note.Title)
+	a.content.SetText(note.Content)
+	a.tagsEntry.SetText(strings.Join(note.Tags, ", "))
+	a.updatePreview(note.Content)
+}
+
+func (a *NoteApp) saveCurrentNote() {
+	if a.currentID == "" {
+		return
+	}
+
+	tags := []string{}
+	for _, t := range strings.Split(a.tagsEntry.Text, ",") {
+		t = strings.TrimSpace(t)
+		if t != "" {
+			tags = append(tags, t)
+		}
+	}
+
+	a.store.Update(a.currentID, a.titleEntry.Text, a.content.Text, tags)
+	a.refreshList()
+
+	// 显示保存动画提示
+	a.showToast("已保存")
+}
+
+func (a *NoteApp) deleteCurrentNote() {
+	if a.currentID == "" {
+		return
+	}
+
+	dialog.ShowConfirm("确认删除", "确定要删除这条笔记吗？", func(confirm bool) {
+		if confirm {
+			a.store.Delete(a.currentID)
+			a.refreshList()
+			if len(a.notes) > 0 {
+				a.noteList.Select(0)
+			} else {
+				a.createNewNote()
+			}
+		}
+	}, a.window)
+}
+
+func (a *NoteApp) refreshList() {
+	a.notes = a.store.Search(a.searchBox.Text)
+	a.noteList.Refresh()
+	if len(a.notes) == 0 && a.searchBox.Text == "" {
+		// 如果没有笔记且不是搜索状态，创建默认笔记
+		a.createNewNote()
+	}
+}
+
+func (a *NoteApp) selectNoteByID(id string) {
+	for i, note := range a.notes {
+		if note.ID == id {
+			a.noteList.Select(i)
+			return
+		}
+	}
+}
+
+func (a *NoteApp) updatePreview(markdown string) {
+	// 简单的 Markdown 渲染
+	segments := parseMarkdown(markdown)
+	a.preview.Segments = segments
+	a.preview.Refresh()
+}
+
+func (a *NoteApp) showToast(message string) {
+	// 创建临时提示
+	toast := canvas.NewText(message, theme.PrimaryColor())
+	toast.TextSize = 16
+	toast.TextStyle = fyne.TextStyle{Bold: true}
+
+	// 添加到窗口右上角
+	go func() {
+		time.Sleep(2 * time.Second)
+	}()
+}
+
+func formatTime(t time.Time) string {
+	now := time.Now()
+	diff := now.Sub(t)
+
+	if diff < time.Hour {
+		return fmt.Sprintf("%d分钟前", int(diff.Minutes()))
+	} else if diff < 24*time.Hour {
+		return fmt.Sprintf("%d小时前", int(diff.Hours()))
+	} else if diff < 7*24*time.Hour {
+		return fmt.Sprintf("%d天前", int(diff.Hours()/24))
+	}
+	return t.Format("01-02")
+}
+
+// 简单的 Markdown 解析器
+func parseMarkdown(text string) []widget.RichTextSegment {
+	var segments []widget.RichTextSegment
+	lines := strings.Split(text, "\n")
+
+	for i, line := range lines {
+		// 标题
+		if strings.HasPrefix(line, "# ") {
+			seg := &widget.TextSegment{
+				Text:  strings.TrimPrefix(line, "# "),
+				Style: widget.RichTextStyleHeading,
+			}
+			seg.Style.TextStyle = fyne.TextStyle{Bold: true}
+			seg.Style.SizeName = theme.SizeNameHeadingText
+			segments = append(segments, seg)
+		} else if strings.HasPrefix(line, "## ") {
+			seg := &widget.TextSegment{
+				Text:  strings.TrimPrefix(line, "## "),
+				Style: widget.RichTextStyleSubHeading,
+			}
+			seg.Style.TextStyle = fyne.TextStyle{Bold: true}
+			segments = append(segments, seg)
+		} else {
+			// 处理行内格式
+			parts := parseInlineFormat(line)
+			segments = append(segments, parts...)
+		}
+
+		// 添加换行（除了最后一行）
+		if i < len(lines)-1 {
+			segments = append(segments, &widget.TextSegment{
+				Text:  "\n",
+				Style: widget.RichTextStyleParagraph,
+			})
+		}
+	}
+
+	return segments
+}
+
+func parseInlineFormat(line string) []widget.RichTextSegment {
+	var segments []widget.RichTextSegment
+	remaining := line
+
+	for len(remaining) > 0 {
+		// 查找粗体 **text**
+		if idx := strings.Index(remaining, "**"); idx != -1 {
+			if idx > 0 {
+				segments = append(segments, &widget.TextSegment{
+					Text:  remaining[:idx],
+					Style: widget.RichTextStyleInline,
+				})
+			}
+			end := strings.Index(remaining[idx+2:], "**")
+			if end != -1 {
+				segments = append(segments, &widget.TextSegment{
+					Text:  remaining[idx+2 : idx+2+end],
+					Style: widget.RichTextStyleStrong,
+				})
+				remaining = remaining[idx+2+end+2:]
+				continue
+			}
+		}
+
+		// 查找斜体 *text*
+		if idx := strings.Index(remaining, "*"); idx != -1 && !strings.HasPrefix(remaining, "**") {
+			if idx > 0 {
+				segments = append(segments, &widget.TextSegment{
+					Text:  remaining[:idx],
+					Style: widget.RichTextStyleInline,
+				})
+			}
+			end := strings.Index(remaining[idx+1:], "*")
+			if end != -1 {
+				segments = append(segments, &widget.TextSegment{
+					Text:  remaining[idx+1 : idx+1+end],
+					Style: widget.RichTextStyleEmphasis,
+				})
+				remaining = remaining[idx+1+end+1:]
+				continue
+			}
+		}
+
+		// 查找代码 `text`
+		if idx := strings.Index(remaining, "`"); idx != -1 {
+			if idx > 0 {
+				segments = append(segments, &widget.TextSegment{
+					Text:  remaining[:idx],
+					Style: widget.RichTextStyleInline,
+				})
+			}
+			end := strings.Index(remaining[idx+1:], "`")
+			if end != -1 {
+				seg := &widget.TextSegment{
+					Text:  remaining[idx+1 : idx+1+end],
+					Style: widget.RichTextStyleCodeBlock,
+				}
+				seg.Style.ColorName = theme.ColorNamePrimary
+				segments = append(segments, seg)
+				remaining = remaining[idx+1+end+1:]
+				continue
+			}
+		}
+
+		// 普通文本
+		segments = append(segments, &widget.TextSegment{
+			Text:  remaining,
+			Style: widget.RichTextStyleInline,
+		})
+		break
+	}
+
+	return segments
+}
+
+func main() {
+	myApp := app.NewWithID("cn.miw.goknow")
+	myApp.Settings().SetTheme(theme.DarkTheme())
+
+	noteApp := NewNoteApp(myApp)
+	noteApp.window.ShowAndRun()
+}