Added widget-stack that stacks widget like for tab group

internal/glance/templates/stack.html

@@ -0,0 +1,9 @@
+{{ template "widget-base.html" . }}
+
+{{ define "widget-content-classes" }}widget-content-frameless{{ end }}
+
+{{ define "widget-content" }}
+    {{- range $i, $widget := .Widgets }}
+        {{- .Render -}}
+    {{- end }}
+{{ end }}

internal/glance/widget-stack.go

@@ -0,0 +1,53 @@
+package glance
+
+import (
+	"context"
+	"errors"
+	"html/template"
+	"time"
+)
+
+var stackWidgetTemplate = mustParseTemplate("stack.html", "widget-base.html")
+
+type stackWidget struct {
+	widgetBase          `yaml:",inline"`
+	containerWidgetBase `yaml:",inline"`
+}
+
+func (widget *stackWidget) initialize() error {
+	widget.withError(nil)
+	widget.HideHeader = true
+
+	for i := range widget.Widgets {
+
+		if widget.Widgets[i].GetType() == "stack" {
+			return errors.New("nested stacks are not supported")
+		} else if widget.Widgets[i].GetType() == "group" {
+			return errors.New("groups inside of stacks are not supported")
+		} else if widget.Widgets[i].GetType() == "split-column" {
+			return errors.New("split columns inside of stacks are not supported")
+		}
+	}
+
+	if err := widget.containerWidgetBase._initializeWidgets(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (widget *stackWidget) update(ctx context.Context) {
+	widget.containerWidgetBase._update(ctx)
+}
+
+func (widget *stackWidget) setProviders(providers *widgetProviders) {
+	widget.containerWidgetBase._setProviders(providers)
+}
+
+func (widget *stackWidget) requiresUpdate(now *time.Time) bool {
+	return widget.containerWidgetBase._requiresUpdate(now)
+}
+
+func (widget *stackWidget) Render() template.HTML {
+	return widget.renderTemplate(widget, stackWidgetTemplate)
+}

internal/glance/widget.go

@@ -83,6 +83,8 @@ func newWidget(widgetType string) (widget, error) {
 		w = &torrentsWidget{}
 	case "to-do":
 		w = &todoWidget{}
+	case "stack":
+		w = &stackWidget{}
 	case "trending-repositories":
 		w = &trendingRepositoriesWidget{}
 	default: