initial commit

responsive.go

@@ -0,0 +1,56 @@
+package gel
+
+import (
+	"sort"
+	
+	l "github.com/p9c/p9/pkg/gel/gio/layout"
+)
+
+// WidgetSize is a widget with a specification of the minimum size to select it for viewing.
+// Note that the widgets you put in here should be wrapped in func(l.Context) l.Dimensions otherwise
+// any parameters retrieved from the controlling state variable will be from initialization and not
+// at execution of the widget in the render process
+type WidgetSize struct {
+	Size   float32
+	Widget l.Widget
+}
+
+type Widgets []WidgetSize
+
+func (w Widgets) Len() int {
+	return len(w)
+}
+
+func (w Widgets) Less(i, j int) bool {
+	// we want largest first so this uses greater than
+	return w[i].Size > w[j].Size
+}
+
+func (w Widgets) Swap(i, j int) {
+	w[i], w[j] = w[j], w[i]
+}
+
+type Responsive struct {
+	*Theme
+	Widgets
+	size int32
+}
+
+func (th *Theme) Responsive(size int32, widgets Widgets) *Responsive {
+	return &Responsive{Theme: th, size: size, Widgets: widgets}
+}
+
+func (r *Responsive) Fn(gtx l.Context) l.Dimensions {
+	out := func(l.Context) l.Dimensions {
+		return l.Dimensions{}
+	}
+	sort.Sort(r.Widgets)
+	for i := range r.Widgets {
+		if float32(r.size)/float32(r.TextSize) >= r.Widgets[i].Size {
+			out = r.Widgets[i].Widget
+			// D.Ln("selected widget for responsive with scale", r.size, "width", r.Widgets[i].Size)
+			break
+		}
+	}
+	return out(gtx)
+}