Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

input/file_picker.go

@@ -0,0 +1,137 @@
+package input
+
+import (
+	"fmt"
+	"log/slog"
+	"path/filepath"
+	"strings"
+
+	"github.com/egoist/mygo"
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+	"github.com/ZacharyZhang-NY/MujicaUI/icons"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
+)
+
+// FilePickerOptions configure a FilePicker.
+type FilePickerOptions struct {
+	// Directory picks folders instead of files.
+	Directory bool
+	Multiple  bool
+	// Filters limit the files offered by extension, without the dot.
+	Filters []mygo.FileFilter
+	// Title is the system dialog's title.
+	Title string
+	// Label is the button text; empty uses the built-in "Choose file…" or "Choose folder…".
+	Label string
+	// Parent attaches the dialog to a window, as a sheet on macOS.
+	Parent   *mygo.Window
+	Disabled bool
+}
+
+// FilePickerParts are the parts of a FilePicker.
+type FilePickerParts struct {
+	Element  *ui.Element
+	changed  bool
+	canceled bool
+}
+
+// Changed reports whether the user picked new paths this frame.
+func (p FilePickerParts) Changed() bool { return p.changed }
+
+// Canceled reports whether the user closed the dialog without picking, which is not an error.
+func (p FilePickerParts) Canceled() bool { return p.canceled }
+
+// filePickerOpen shows the system dialog; tests replace it.
+var filePickerOpen = mygo.Dialog.Open
+
+type filePickerResult struct {
+	paths []string
+	err   error
+}
+
+type filePickerState struct {
+	result chan filePickerResult
+	err    string
+}
+
+// FilePicker opens the system file dialog off the UI thread and stores the chosen paths.
+func FilePicker(c *ui.Context, paths *[]string, opts FilePickerOptions) FilePickerParts {
+	for _, f := range opts.Filters {
+		for _, ext := range f.Extensions {
+			if ext == "" || strings.HasPrefix(ext, ".") {
+				panic(fmt.Sprintf("mujica: FilePicker extension %q: give it without the dot", ext))
+			}
+		}
+	}
+	k := core.Tokens(c)
+	d := core.Density(c)
+	parts := FilePickerParts{}
+	col := ui.Column(c).Gap(d.Unit() * 2).AlignItems(ui.Start)
+	parts.Element = col
+	st := ui.Local(col, "picker", func() filePickerState { return filePickerState{} })
+	if st.result != nil {
+		select {
+		case r := <-st.result:
+			st.result = nil
+			switch {
+			case r.err != nil:
+				st.err = fmt.Sprintf(core.Msg(c, "file_picker.failed"), r.err)
+				slog.Debug("mujica: file picker failed", "err", r.err)
+			case r.paths == nil:
+				parts.canceled = true
+				slog.Debug("mujica: file picker canceled")
+			default:
+				*paths = r.paths
+				parts.changed = true
+				slog.Debug("mujica: file picker picked", "count", len(r.paths))
+			}
+		default:
+		}
+	}
+	label := opts.Label
+	if label == "" {
+		label = core.Msg(c, "file_picker.choose_file")
+		if opts.Directory {
+			label = core.Msg(c, "file_picker.choose_folder")
+		}
+	}
+	icon := icons.Must("file")
+	if opts.Directory {
+		icon = icons.Must("folder")
+	}
+	col.Children(func() {
+		b := Button(c, label, ButtonOptions{Variant: Secondary, Icon: icon, Loading: st.result != nil, Disabled: opts.Disabled})
+		if b.Clicked() {
+			st.err = ""
+			ch := make(chan filePickerResult, 1)
+			st.result = ch
+			dlg := mygo.OpenDialogOptions{Parent: opts.Parent, Title: opts.Title, Filters: opts.Filters,
+				Directory: opts.Directory, Multiple: opts.Multiple}
+			slog.Debug("mujica: file picker opened", "directory", opts.Directory, "multiple", opts.Multiple)
+			go func() {
+				p, err := filePickerOpen(dlg)
+				ch <- filePickerResult{p, err}
+				c.Invalidate()
+			}()
+		}
+		switch {
+		case st.err != "":
+			ui.Text(c, st.err).TextColor(k.Danger).FontSize(core.FontSize(c, theme.CaptionSize)).Role(ui.RoleStatus)
+		case len(*paths) == 0:
+			ui.Text(c, core.Msg(c, "file_picker.none")).TextColor(k.TextMuted).FontSize(core.FontSize(c, theme.CaptionSize))
+		default:
+			ui.Column(c).Gap(d.Unit()).Children(func() {
+				for _, p := range *paths {
+					ui.Row(c).Key(p).Gap(d.Unit() * 2).AlignItems(ui.Center).Children(func() {
+						ui.Icon(c, icon).Size(14, 14).TextColor(k.TextMuted)
+						ui.Text(c, filepath.Base(p)).SingleLine()
+						ui.Text(c, filepath.Dir(p)).TextColor(k.TextMuted).FontSize(core.FontSize(c, theme.CaptionSize)).SingleLine().Ellipsis("…").MinWidth(0).Shrink(1)
+					})
+				}
+			})
+		}
+	})
+	return parts
+}