cogentcore · rcoreilly · Nov 13, 2024 · Nov 10, 2024 · Nov 10, 2024 · Nov 10, 2024
diff --git a/core/pages.go b/core/pages.go
@@ -0,0 +1,66 @@
+// Copyright (c) 2024, Cogent Core. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package core
+
+import (
+	"fmt"
+
+	"cogentcore.org/core/styles"
+)
+
+// Pages is a frame that can easily swap its content between that of
+// different possible pages.
+type Pages struct {
+	Frame
+
+	// Page is the currently open page.
+	Page string
+
+	// Pages is a map of page names to functions that configure a page.
+	Pages map[string]func(pg *Pages) `set:"-"`
+
+	// page is the currently rendered page.
+	page string
+}
+
+func (pg *Pages) Init() {
+	pg.Frame.Init()
+	pg.Pages = map[string]func(pg *Pages){}
+	pg.Styler(func(s *styles.Style) {
+		s.Direction = styles.Column
+		s.Grow.Set(1, 1)
+	})
+	pg.Updater(func() {
+		if len(pg.Pages) == 0 {
+			return
+		}
+		if pg.page == pg.Page {
+			return
+		}
+		pg.DeleteChildren()
+		fun, ok := pg.Pages[pg.Page]
+		if !ok {
+			ErrorSnackbar(pg, fmt.Errorf("page %q not found", pg.Page))
+			return
+		}
+		pg.page = pg.Page
+		fun(pg)
+	})
+}
+
+// AddPage adds a page with the given name and configuration function.
+// If [Pages.Page] is currently unset, it will be set to the given name.
+func (pg *Pages) AddPage(name string, f func(pg *Pages)) {
+	pg.Pages[name] = f
+	if pg.Page == "" {
+		pg.Page = name
+	}
+}
+
+// Open sets the current page to the given name and updates the display.
+func (pg *Pages) Open(name string) {
+	pg.SetPage(name)
+	pg.Update()
+}
diff --git a/core/typegen.go b/core/typegen.go
diff --git a/docs/content/1-tutorials/2-sign-in.md b/docs/content/1-tutorials/2-sign-in.md
@@ -0,0 +1,21 @@
+```Go
+type user struct {
+    Username string
+    Password string
+}
+u := &user{}
+pg := core.NewPages(b)
+pg.AddPage("sign-in", func(pg *core.Pages) {
+    core.NewForm(pg).SetStruct(u)
+    core.NewButton(pg).SetText("Sign in").OnClick(func(e events.Event) {
+        pg.Open("home")
+    })
+})
+pg.AddPage("home", func(pg *core.Pages) {
+    core.NewText(pg).SetText("Welcome, "+u.Username+"!").SetType(core.TextHeadlineSmall)
+    core.NewButton(pg).SetText("Sign out").OnClick(func(e events.Event) {
+        *u = user{}
+        pg.Open("sign-in")
+    })
+})
+```
diff --git a/yaegicore/symbols/cogentcore_org-core-base-fileinfo.go b/yaegicore/symbols/cogentcore_org-core-base-fileinfo.go
diff --git a/yaegicore/symbols/cogentcore_org-core-base-fsx.go b/yaegicore/symbols/cogentcore_org-core-base-fsx.go
diff --git a/yaegicore/symbols/cogentcore_org-core-base-reflectx.go b/yaegicore/symbols/cogentcore_org-core-base-reflectx.go
diff --git a/yaegicore/symbols/cogentcore_org-core-core.go b/yaegicore/symbols/cogentcore_org-core-core.go
diff --git a/yaegicore/symbols/cogentcore_org-core-filetree.go b/yaegicore/symbols/cogentcore_org-core-filetree.go