add 'gadgets'

attempt func (n *gui.Node) blah() definition
    better docs for pkg.go.dev
    how logging should work
    fix syntax links for pkg.go.dev

Signed-off-by: Jeff Carr <jcarr@wit.com>

README.md

@@ -93,10 +93,10 @@ hopefully also things like libSDL, faiface/pixel, slint
 Useful links and other
 external things which might be useful
 
-[Wikipedia Graphical widget]: [https://en.wikipedia.org/wiki/Graphical_widget](https://en.wikipedia.org/wiki/Graphical_widget)
+* Wikipedia Graphical widget - [https://en.wikipedia.org/wiki/Graphical_widget](https://en.wikipedia.org/wiki/Graphical_widget)
-[Github mirror]: [https://github.com/witorg/gui](https://github.com/witorg/gui)
+* Github mirror - [https://github.com/witorg/gui](https://github.com/witorg/gui)
-[Federated git pull]: [https://github.com/forgefed/forgefed](https://github.com/forgefed/forgefed)
+* Federated git pull - [https://github.com/forgefed/forgefed](https://github.com/forgefed/forgefed)
-[GO Style Guide]: [https://google.github.io/styleguide/go/index](https://google.github.io/styleguide/go/index)
+* GO Style Guide - [https://google.github.io/styleguide/go/index](https://google.github.io/styleguide/go/index)
 
 ```go
 * [Wikipedia Graphical widget]

debugWindow.go

@@ -98,6 +98,10 @@ func (n *Node) DebugTab(title string) *Node {
 		me.rootNode.LoadToolkit("gocui")
 	})
 
+	g2.NewButton("load toolkit 'andlabs'", func () {
+		me.rootNode.LoadToolkit("andlabs")
+	})
+
 	return newN
 }
 

examples/buttons/log.go

@@ -24,6 +24,25 @@ var f2 *os.File
 var err error
 */
 
+/* from gocron:
+
+// DefaultLogger is used by Cron if none is specified.
+var DefaultLogger Logger = PrintfLogger(log.New(os.Stdout, "cron: ", log.LstdFlags))
+
+// DiscardLogger can be used by callers to discard all log messages.
+var DiscardLogger Logger = PrintfLogger(log.New(ioutil.Discard, "", 0))
+
+// Logger is the interface used in this package for logging, so that any backend
+// can be plugged in. It is a subset of the github.com/go-logr/logr interface.
+type Logger interface {
+	// Info logs routine messages about cron's operation.
+	Info(msg string, keysAndValues ...interface{})
+	// Error logs an error condition.
+	Error(err error, msg string, keysAndValues ...interface{})
+}
+
+*/
+
 func init() {
 	arg.MustParse(&args)
 	fmt.Println(args.Foo, args.Bar, args.User)
@@ -34,6 +53,7 @@ func init() {
 	log.Log(true, "INIT() args.GuiArg.Gui =", gui.GuiArg.Gui)
 
 /*
+	// from: https://github.com/robfig/cron/blob/master/logger.go
 	log.Println()
 	log.Println("STDOUT is now at /tmp/guilogfile")
 	log.Println("STDOUT is now at /tmp/guilogfile")

gadgets/README.md

@@ -0,0 +1,15 @@
+# gadgets
+
+Package gadgets are special collections of widgets
+
+Things to avoid or keep in mind: Also Features these might enable:
+
+```go
+* These should never bypass the binary tree
+* Hide complexity internally here
+* These might require corresponding toolkit implementations?
+* These might allow unique/good corresponding toolkit implementations (date/time selection?)
+
+## Warning
+
+Doing this / adding these might be a really bad idea that I will regret later

gadgets/basicLabel.go

@@ -0,0 +1,60 @@
+/*
+	A Labeled label:
+
+	-----------------------------
+	|            |              |
+	|   Food:    |    Apple     |
+	|            |              |
+	-----------------------------
+*/
+package gadgets
+
+import 	(
+	"go.wit.com/log"
+	"go.wit.com/gui"
+)
+
+type Node gui.Node
+
+type BasicLabel struct {
+	p	*gui.Node	// parent widget
+	l	*gui.Node	// label widget
+	v	*gui.Node	// value widget
+
+	value	string
+	label	string
+
+	Custom func()
+}
+
+func (n *BasicLabel) Get() string {
+	return n.value
+}
+
+func (n *BasicLabel) Set(value string) *BasicLabel {
+	log.Println("BasicLabel.Set() =", value)
+	if (n.v != nil) {
+		n.v.Set(value)
+	}
+	n.value = value
+	return n
+}
+
+func (ngui *Node) NewBasicLabel(name string) *BasicLabel {
+	var n *gui.Node
+	n = (*gui.Node)(ngui)
+	d := BasicLabel {
+		p: n,
+		value: "",
+	}
+
+	// various timeout settings
+	d.l = n.NewLabel(name)
+	d.v = n.NewLabel("")
+	d.v.Custom = func() {
+		d.value = d.v.S
+		log.Println("BasicLabel.Custom() user changed value to =", d.value)
+	}
+
+	return &d
+}

gadgets/durationSlider.go

@@ -0,0 +1,79 @@
+/*
+	A slider that goes between a High and Low time
+*/
+
+package gadgets
+
+import 	(
+	"log"
+	"fmt"
+	"time"
+
+	"go.wit.com/gui"
+)
+
+type Duration struct {
+	p	*gui.Node	// parent widget
+	l	*gui.Node	// label widget
+	s	*gui.Node	// slider widget
+
+	Label	string
+	Low	time.Duration
+	High	time.Duration
+	Duration	time.Duration
+
+	Custom	func()
+}
+
+func (n *Duration) Set(d time.Duration) {
+	var timeRange, step, offset time.Duration
+
+	if (d > n.High) {
+		d = n.High
+	}
+	if (d < n.Low) {
+		d = n.Low
+	}
+
+	// set the duration
+	n.Duration = d
+
+	// figure out the integer offset for the Slider GUI Widget
+	timeRange = n.High - n.Low
+	step = timeRange / 1000
+	if (step == 0) {
+		log.Println("duration.Set() division by step == 0", n.Low, n.High, timeRange, step)
+		n.s.Set(0)
+		return
+	}
+	offset = d - n.Low
+	i := int(offset / step)
+	log.Println("duration.Set() =", n.Low, n.High, d, "i =", i)
+	n.s.I = i
+	n.s.Set(i)
+	n.s.Custom()
+}
+
+func NewDurationSlider(n *gui.Node, label string, low time.Duration, high time.Duration) *Duration {
+	d := Duration {
+		p: n,
+		Label: label,
+		High: high,
+		Low: low,
+	}
+
+	// various timeout settings
+	d.l = n.NewLabel(label)
+	d.s = n.NewSlider(label, 0, 1000)
+	d.s.Custom = func () {
+		d.Duration = low + (high - low) * time.Duration(d.s.I) / 1000
+		log.Println("d.Duration =", d.Duration)
+		s := fmt.Sprintf("%s (%v)", d.Label, d.Duration)
+		d.l.SetText(s)
+		if (d.Custom != nil) {
+			d.Custom()
+		}
+	}
+
+	return &d
+}

gadgets/oneLiner.go

@@ -0,0 +1,56 @@
+/*
+	A Labeled label:
+
+	-----------------------------
+	|            |              |
+	|   Food:    |    Apple     |
+	|            |              |
+	-----------------------------
+*/
+package gadgets
+
+import 	(
+	"go.wit.com/log"
+	"go.wit.com/gui"
+)
+
+type OneLiner struct {
+	p	*gui.Node	// parent widget
+	l	*gui.Node	// label widget
+	v	*gui.Node	// value widget
+
+	value	string
+	label	string
+
+	Custom func()
+}
+
+func (n *OneLiner) Get() string {
+	return n.value
+}
+
+func (n *OneLiner) Set(value string) *OneLiner {
+	log.Println("OneLiner.Set() =", value)
+	if (n.v != nil) {
+		n.v.Set(value)
+	}
+	n.value = value
+	return n
+}
+
+func NewOneLiner(n *gui.Node, name string) *OneLiner {
+	d := OneLiner {
+		p: n,
+		value: "",
+	}
+
+	// various timeout settings
+	d.l = n.NewLabel(name)
+	d.v = n.NewLabel("")
+	d.v.Custom = func() {
+		d.value = d.v.S
+		log.Println("OneLiner.Custom() user changed value to =", d.value)
+	}
+
+	return &d
+}

structs.go

@@ -61,8 +61,13 @@ type Node struct {
 
 	WidgetType	toolkit.WidgetType
 
+	// for NewLabel("hello"), Text = 'hello'
 	Text string  // what is visable to the user
-	Name string  // a name useful for programming
+
+	// for NewLabel("hello"), if Name = 'HELLO'
+	// this can programatically identify the widget
+	// The name must be unique
+	Name string  // a name useful for debugging
 
 	// used for Windows in toolkits measured in pixels
 	width  int
@@ -72,19 +77,21 @@ type Node struct {
 	X	int
 	Y	int
 
-	// the grid max width and height
+	// the grid widget max width and height
-	// ignore max height when there is no space left?
+	// the max height can be implemented in the toolkit plugin
+	// to restrict the number of rows to display
 	W	int
 	H	int
+
 	// where the next widget should be put in this grid
 	NextW	int
 	NextH	int
 
-	// if this widget is in a grid, this is the position
+	// if this widget is in a grid, this is the position of a widget
 	AtW	int
 	AtH	int
 
-	// used for values
+	// the current widget value.
 	I	int
 	S	string
 	B	bool