forked from Mirrors/bubbletea
149 lines
3.9 KiB
Go
149 lines
3.9 KiB
Go
package main
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// An example program demonstrating the pager component from the Bubbles
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// component library.
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import (
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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"github.com/charmbracelet/bubbles/viewport"
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tea "github.com/charmbracelet/bubbletea"
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"github.com/charmbracelet/lipgloss"
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)
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// You generally won't need this unless you're processing stuff with
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// complicated ANSI escape sequences. Turn it on if you notice flickering.
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//
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// Also keep in mind that high performance rendering only works for programs
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// that use the full size of the terminal. We're enabling that below with
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// tea.EnterAltScreen().
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const useHighPerformanceRenderer = false
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var (
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titleStyle = func() lipgloss.Style {
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b := lipgloss.RoundedBorder()
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b.Right = "├"
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return lipgloss.NewStyle().BorderStyle(b).Padding(0, 1)
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}()
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infoStyle = func() lipgloss.Style {
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b := lipgloss.RoundedBorder()
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b.Left = "┤"
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return titleStyle.Copy().BorderStyle(b)
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}()
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)
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type model struct {
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content string
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ready bool
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viewport viewport.Model
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}
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func (m model) Init() tea.Cmd {
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return nil
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}
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func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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var (
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cmd tea.Cmd
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cmds []tea.Cmd
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)
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switch msg := msg.(type) {
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case tea.KeyMsg:
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if k := msg.String(); k == "ctrl+c" || k == "q" || k == "esc" {
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return m, tea.Quit
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}
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case tea.WindowSizeMsg:
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headerHeight := lipgloss.Height(m.headerView())
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footerHeight := lipgloss.Height(m.footerView())
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verticalMarginHeight := headerHeight + footerHeight
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if !m.ready {
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// Since this program is using the full size of the viewport we
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// need to wait until we've received the window dimensions before
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// we can initialize the viewport. The initial dimensions come in
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// quickly, though asynchronously, which is why we wait for them
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// here.
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m.viewport = viewport.New(msg.Width, msg.Height-verticalMarginHeight)
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m.viewport.YPosition = headerHeight
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m.viewport.HighPerformanceRendering = useHighPerformanceRenderer
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m.viewport.SetContent(m.content)
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m.ready = true
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// This is only necessary for high performance rendering, which in
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// most cases you won't need.
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//
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// Render the viewport one line below the header.
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m.viewport.YPosition = headerHeight + 1
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} else {
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m.viewport.Width = msg.Width
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m.viewport.Height = msg.Height - verticalMarginHeight
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}
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if useHighPerformanceRenderer {
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// Render (or re-render) the whole viewport. Necessary both to
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// initialize the viewport and when the window is resized.
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//
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// This is needed for high-performance rendering only.
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cmds = append(cmds, viewport.Sync(m.viewport))
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}
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}
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// Handle keyboard and mouse events in the viewport
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m.viewport, cmd = m.viewport.Update(msg)
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cmds = append(cmds, cmd)
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return m, tea.Batch(cmds...)
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}
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func (m model) View() string {
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if !m.ready {
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return "\n Initializing..."
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}
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return fmt.Sprintf("%s\n%s\n%s", m.headerView(), m.viewport.View(), m.footerView())
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}
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func (m model) headerView() string {
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title := titleStyle.Render("Mr. Pager")
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line := strings.Repeat("─", max(0, m.viewport.Width-lipgloss.Width(title)))
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return lipgloss.JoinHorizontal(lipgloss.Center, title, line)
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}
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func (m model) footerView() string {
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info := infoStyle.Render(fmt.Sprintf("%3.f%%", m.viewport.ScrollPercent()*100))
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line := strings.Repeat("─", max(0, m.viewport.Width-lipgloss.Width(info)))
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return lipgloss.JoinHorizontal(lipgloss.Center, line, info)
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}
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func max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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func main() {
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// Load some text for our viewport
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content, err := ioutil.ReadFile("artichoke.md")
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if err != nil {
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fmt.Println("could not load file:", err)
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os.Exit(1)
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}
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p := tea.NewProgram(
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model{content: string(content)},
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tea.WithAltScreen(), // use the full size of the terminal in its "alternate screen buffer"
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tea.WithMouseCellMotion(), // turn on mouse support so we can track the mouse wheel
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)
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if err := p.Start(); err != nil {
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fmt.Println("could not run program:", err)
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os.Exit(1)
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}
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}
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