Update README

README.md

@@ -77,9 +77,11 @@ func main() {
         Side: ui.N,
     })
 
-    // Add the button to the MainWindow's Supervisor so it can be
-    // clicked on and interacted with.
-    mw.Add(button)
+    // Add a mouse-over tooltip to the button.
+    ui.NewTooltip(button, ui.Tooltip{
+        Text: "You know you want to click this button",
+        Edge: ui.Right,
+    })
 
     mw.MainLoop()
 }
@@ -133,6 +135,7 @@ most complex.
     state of the checkbox.
 * [x] **Window**: a Frame with a title bar Frame on top.
   * Note: Window is not yet draggable or closeable.
+* [x] **Tooltip**: a mouse hover label attached to a widget.
 
 **Work in progress widgets:**
 

eg/hello-world/main.go

@@ -4,9 +4,14 @@ import (
 	"fmt"
 
 	"git.kirsle.net/go/render"
+	"git.kirsle.net/go/render/sdl"
 	"git.kirsle.net/go/ui"
 )
 
+func init() {
+	sdl.DefaultFontFilename = "../DejaVuSans.ttf"
+}
+
 func main() {
 	mw, err := ui.NewMainWindow("Hello World")
 	if err != nil {
@@ -19,10 +24,9 @@ func main() {
 	label := ui.NewLabel(ui.Label{
 		Text: "Hello, world!",
 		Font: render.Text{
-			FontFilename: "../DejaVuSans.ttf",
-			Size:         32,
-			Color:        render.SkyBlue,
-			Shadow:       render.SkyBlue.Darken(40),
+			Size:   32,
+			Color:  render.SkyBlue,
+			Shadow: render.SkyBlue.Darken(40),
 		},
 	})
 	mw.Pack(label, ui.Pack{
@@ -47,5 +51,11 @@ func main() {
 		Side: ui.N,
 	})
 
+	// Add a mouse-over tooltip to the button.
+	ui.NewTooltip(button, ui.Tooltip{
+		Text: "You know you want to click this button",
+		Edge: ui.Right,
+	})
+
 	mw.MainLoop()
 }