Did a lot of work off-repo, basically init

ui/fileselectordialog.go

@@ -0,0 +1,129 @@
+package ui
+
+import (
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+// A FileSelectorDialog is a WindowContainer with an input and buttons for selecting files.
+// It can be used to open zero or more existing files, or select one non-existant file (for saving).
+type FileSelectorDialog struct {
+	MustExist           bool           // Whether the dialog should have a user select an existing file.
+	FilesChosenCallback func([]string) // Returns slice of filenames selected. nil if user canceled.
+	CancelCallback      func() // Called when the dialog has been canceled by the user
+
+	container     *WindowContainer
+	x, y          int
+	width, height int
+	focused       bool
+
+	tabOrder         []Component
+	tabOrderIdx      int
+
+	inputField    *InputField
+	confirmButton *Button
+	cancelButton  *Button
+
+	Theme *Theme
+}
+
+func NewFileSelectorDialog(screen *tcell.Screen, title string, mustExist bool, theme *Theme, filesChosenCallback func([]string), cancelCallback func()) *FileSelectorDialog {
+	dialog := &FileSelectorDialog{
+		MustExist:           mustExist,
+		FilesChosenCallback: filesChosenCallback,
+		container:           NewWindowContainer(title, nil, theme),
+		Theme:               theme,
+	}
+
+	dialog.inputField = NewInputField(screen, "", theme)
+	dialog.confirmButton = NewButton("Confirm", theme, dialog.onConfirm)
+	dialog.cancelButton = NewButton("Cancel", theme, cancelCallback)
+	dialog.tabOrder = []Component{dialog.inputField, dialog.cancelButton, dialog.confirmButton}
+
+	return dialog
+}
+
+// onConfirm is a callback called by the confirm button.
+func (d *FileSelectorDialog) onConfirm() {
+	if d.FilesChosenCallback != nil {
+		files := strings.Split(d.inputField.Text, ",") // Split input by commas
+		for i := range files {
+			files[i] = strings.TrimSpace(files[i]) // Trim all strings in slice
+		}
+		d.FilesChosenCallback(files)
+	}
+}
+
+func (d *FileSelectorDialog) SetTitle(title string) {
+	d.container.Title = title
+}
+
+func (d *FileSelectorDialog) Draw(s tcell.Screen) {
+	d.container.Draw(s)
+
+	// Update positions of child components (dependent on size information that may not be available at SetPos() )
+	btnWidth, _ := d.confirmButton.GetSize()
+	d.confirmButton.SetPos(d.x+d.width-btnWidth-1, d.y+4) // Place "Ok" button on right, bottom
+
+	d.inputField.Draw(s)
+	d.confirmButton.Draw(s)
+	d.cancelButton.Draw(s)
+}
+
+func (d *FileSelectorDialog) SetFocused(v bool) {
+	d.focused = v
+	d.tabOrder[d.tabOrderIdx].SetFocused(v)
+}
+
+func (d *FileSelectorDialog) SetTheme(theme *Theme) {
+	d.Theme = theme
+}
+
+func (d *FileSelectorDialog) GetPos() (int, int) {
+	return d.x, d.y
+}
+
+func (d *FileSelectorDialog) SetPos(x, y int) {
+	d.x, d.y = x, y
+	d.container.SetPos(x, y)
+	d.inputField.SetPos(d.x+1, d.y+2) // Center input field
+	d.cancelButton.SetPos(d.x+1, d.y+4) // Place "Cancel" button on left, bottom
+}
+
+func (d *FileSelectorDialog) GetMinSize() (int, int) {
+	return len(d.container.Title) + 2, 6
+}
+
+func (d *FileSelectorDialog) GetSize() (int, int) {
+	return d.width, d.height
+}
+
+func (d *FileSelectorDialog) SetSize(width, height int) {
+	minX, minY := d.GetMinSize()
+	d.width, d.height = Max(width, minX), Max(height, minY)
+	d.container.SetSize(d.width, d.height)
+
+	d.inputField.SetSize(d.width-2, 1)
+	d.cancelButton.SetSize(d.cancelButton.GetMinSize())
+	d.confirmButton.SetSize(d.confirmButton.GetMinSize())
+}
+
+func (d *FileSelectorDialog) HandleEvent(event tcell.Event) bool {
+	switch ev := event.(type) {
+	case *tcell.EventKey:
+		if ev.Key() == tcell.KeyTab {
+			d.tabOrder[d.tabOrderIdx].SetFocused(false)
+
+			d.tabOrderIdx++
+			if d.tabOrderIdx >= len(d.tabOrder) {
+				d.tabOrderIdx = 0
+			}
+
+			d.tabOrder[d.tabOrderIdx].SetFocused(true)
+
+			return true
+		}
+	}
+	return d.tabOrder[d.tabOrderIdx].HandleEvent(event)
+}