improvements towards a working dns control panel

democui has the help menu
    try to add mouse support to gocui
    make a direct access method
    Margin() and Pad() tests
    add SPEW
    also push devel branch to github

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

Makefile

@@ -55,6 +55,7 @@ cmds-helloconsole:
 github:
 	git push origin master
 	git push github master
+	git push github devel
 	git push github --tags
 	@echo
 	@echo check https://github.com/wit-go/gui

README-goreadme.md

@@ -119,6 +119,10 @@ external things which might be useful
 
 Creates a window helpful for debugging this package
 
+### func [ExampleCatcher](/chan.go#L37)
+
+`func ExampleCatcher(f func())`
+
 ### func [Indent](/debug.go#L130)
 
 `func Indent(b bool, a ...interface{})`
@@ -133,23 +137,12 @@ Creates a window helpful for debugging this package
 
 loads and initializes a toolkit (andlabs/ui, gocui, etc)
 
-### func [Main](/main.go#L97)
+### func [Main](/main.go#L118)
 
 `func Main(f func())`
 
 This should not pass a function
 
-### func [Queue](/main.go#L127)
-
-`func Queue(f func())`
-
-Other goroutines must use this to access the GUI
-
-You can not acess / process the GUI thread directly from
-other goroutines. This is due to the nature of how
-Linux, MacOS and Windows work (they all work differently. suprise. surprise.)
-For example: gui.Queue(NewWindow())
-
 ### func [SetDebug](/debug.go#L28)
 
 `func SetDebug(s bool)`
@@ -162,7 +155,7 @@ For example: gui.Queue(NewWindow())
 
 `func ShowDebugValues()`
 
-### func [StandardExit](/main.go#L147)
+### func [StandardExit](/main.go#L170)
 
 `func StandardExit()`
 
@@ -180,13 +173,13 @@ This goroutine can be used like a watchdog timer
 
 ## Types
 
-### type [GuiArgs](/structs.go#L25)
+### type [GuiArgs](/structs.go#L26)
 
 `type GuiArgs struct { ... }`
 
 This struct can be used with the go-arg package
 
-### type [GuiConfig](/structs.go#L33)
+### type [GuiConfig](/structs.go#L34)
 
 `type GuiConfig struct { ... }`
 
@@ -196,7 +189,7 @@ This struct can be used with the go-arg package
 var Config GuiConfig
 ```
 
-### type [Node](/structs.go#L57)
+### type [Node](/structs.go#L58)
 
 `type Node struct { ... }`
 
@@ -251,6 +244,14 @@ func main() {
 You get a window
 ```
 
+#### func [Start](/main.go#L96)
+
+`func Start() *Node`
+
+#### func [StartS](/main.go#L105)
+
+`func StartS(name string) *Node`
+
 ### type [Symbol](/plugin.go#L16)
 
 `type Symbol any`

chan.go

@@ -8,8 +8,10 @@ import (
 	// "regexp"
 	// "git.wit.org/wit/gui/toolkit"
 	"sync"
+	"runtime"
 	"github.com/sourcegraph/conc"
 	"github.com/sourcegraph/conc/stream"
+	"github.com/sourcegraph/conc/panics"
 )
 
 func makeConc() {
@@ -17,15 +19,42 @@ func makeConc() {
 	defer wg.Wait()
 
 	startTheThing(&wg)
+	log(debugError, "panic?")
+	sleep(2)
+	log(debugError, "panic? after sleep(5)")
 }
 
 func startTheThing(wg *conc.WaitGroup) {
-	wg.Go(func() {
+	f := func() {
-		log(debugNow, "startTheThing()")
+		log(debugError, "startTheThing() == about to panic now")
 		panic("test conc.WaitGroup")
+	}
+	wg.Go(func() {
+		ExampleCatcher(f)
 	})
 }
 
+func ExampleCatcher(f func()) {
+	var pc panics.Catcher
+	i := 0
+	pc.Try(func() { i += 1 })
+	pc.Try(f)
+	pc.Try(func() { i += 1 })
+
+	recovered := pc.Recovered()
+
+	log(debugError, "panic.Recovered():", recovered.Value.(string))
+	frames := runtime.CallersFrames(recovered.Callers)
+	for {
+		frame, more := frames.Next()
+		log(debugError, "\t", frame.Function)
+
+		if !more {
+			break
+		}
+	}
+}
+
 func mapStream(
     in chan int,
     out chan int,

cmds/textbox/main.go

@@ -24,7 +24,9 @@ func main() {
 	arg.MustParse(&args)
 	log.Println("Toolkit = ", args.Toolkit)
 
-	// gui.InitPlugins([]string{"andlabs"})
+	gui.SetDebug(true)
+	// gui.InitPlugins([]string{"gocui"})
+	// gui.InitPlugins([]string{"democui"})
 	gui.Main(initGUI)
 }
 

common.go

@@ -157,3 +157,50 @@ func commonCallback(n *Node) {
 		n.Custom()
 	}
 }
+
+func (n *Node) Margin() {
+	var a toolkit.Action
+	a.Type = toolkit.Margin
+	newaction(&a, n, nil)
+}
+
+func (n *Node) Unmargin() {
+	var a toolkit.Action
+	a.Type = toolkit.Unmargin
+	newaction(&a, n, nil)
+}
+
+func (n *Node) Pad() {
+	var a toolkit.Action
+	a.Type = toolkit.Pad
+	newaction(&a, n, nil)
+}
+
+func (n *Node) Unpad() {
+	var a toolkit.Action
+	a.Type = toolkit.Unpad
+	newaction(&a, n, nil)
+}
+
+func (n *Node) New2() *Node {
+	var newWin *Node
+	newWin = NewWindow()
+	log(debugError, "New2() END Main(f)")
+	return newWin
+}
+
+func (n *Node) Window(title string) *Node {
+	log(debugError, "Window()", n)
+	n.SetText(title)
+	return n
+}
+
+func (n *Node) Standard() *Node {
+	log(debugError, "Standard()")
+	return n
+}
+
+func (n *Node) DoMargin() *Node {
+	log(debugError, "DoMargin()")
+	return n
+}

debugWindow.go

@@ -74,7 +74,7 @@ func (n *Node) DebugTab(title string) *Node {
 		dropdownWindowWidgets(g1)
 	})
 
-	g2 := newN.NewGroup("node things")
+	g2 := newN.NewGroup("more things")
 
 	g2.NewButton("Node.ListChildren(true)", func () {
 		if (activeWidget == nil) {
@@ -87,6 +87,20 @@ func (n *Node) DebugTab(title string) *Node {
 		makeConc()
 	})
 
+	g2.NewButton("List Plugins", func () {
+		for _, aplug := range allPlugins {
+			log("Loaded plugin:", aplug.name, aplug.filename)
+		}
+	})
+
+	g2.NewButton("load plugin 'gocui'", func () {
+		StartS("gocui")
+	})
+
+	g2.NewButton("load plugin 'democui'", func () {
+		StartS("democui")
+	})
+
 	return newN
 }
 

log/log.go

@@ -29,17 +29,24 @@ import 	(
 	// "net"
 )
 
+// various debugging flags
+var LogNow bool = true	// useful for active development
+var LogError bool = true
+var LogWarn bool = false
+var LogInfo bool = false
+var LogVerbose bool = false
+var LogSleep bool = false
+
 var LOGOFF bool = false // turn this off, all logging stops
 var debugToolkit bool = false // does spew stuff?
 
 var Where string = "gui/log"
 
-type spewt struct {
+type Spewt struct {
 	a bool
 }
 
-var SPEW spewt
+var SPEW Spewt
-
 
 /*
 	sleep()		# you know what this does? sleeps for 1 second. yep. dump. easy.
@@ -51,7 +58,7 @@ func Sleep(a ...any) {
 		return
 	}
 
-	Log(true, "sleep", a[0])
+	Log(LogSleep, "sleep", a[0])
 
 	switch a[0].(type) {
 	case int:
@@ -69,7 +76,7 @@ func Sleep(a ...any) {
 	exit("dont like apples")	# ok. I'll make a note of that
 */
 func Exit(a ...any) {
-	Log(true, "exit", a)
+	Log(LogError, "exit", a)
 	//if (a) {
 	//	os.Exit(a)
 	//}

main.go

@@ -57,7 +57,7 @@ func InitPlugins(names []string) {
 	log(debugGui, "Starting gui.Init()")
 
 	for _, aplug := range allPlugins {
-		log(debugGui, "gui.LoadToolkit() already loaded toolkit plugin =", aplug.name)
+		log(debugGui, "LoadToolkit() already loaded toolkit plugin =", aplug.name)
 		for _, name := range names {
 			if (name == aplug.name) {
 				return
@@ -93,6 +93,27 @@ func InitPlugins(names []string) {
 	// StandardExit("golang wit/gui could not load a plugin TODO: do something to STDOUT (?)")
 }
 
+func Start() *Node {
+	log(logInfo, "Start() Main(f)")
+	f := func() {
+	}
+	go Main(f)
+	sleep(1)
+	return Config.master
+}
+
+func StartS(name string) *Node {
+	log(logInfo, "Start() Main(f) for name =", name)
+	if (LoadToolkit(name) == false) {
+		return Config.master
+	}
+	f := func() {
+	}
+	go Main(f)
+	sleep(1)
+	return Config.master
+}
+
 // This should not pass a function
 func Main(f func()) {
 	log(debugGui, "Starting gui.Main() (using gtk via andlabs/ui)")
@@ -111,11 +132,12 @@ func Main(f func()) {
 		}
 		aplug.MainOk = true
 		aplug.Main(f)
-		// f()
 	}
-	// toolkit.Main(f)
 }
 
+/*
+This is deprecated and will be implemented more correctly with waitgroups
+
 // This should never be exposed(?)
 
 // Other goroutines must use this to access the GUI
@@ -135,6 +157,7 @@ func Queue(f func()) {
 		aplug.Queue(f)
 	}
 }
+*/
 
 // The window is destroyed but the application does not quit
 func (n *Node) StandardClose() {

node.go

@@ -55,9 +55,11 @@ func (n *Node) Parent() *Node {
 	return n.parent
 }
 
+/*
 func (n *Node) Window() *Node {
 	return n.parent
 }
+*/
 
 func (n *Node) Append(child *Node) {
 	n.children = append(n.children, child)

plugin.go

@@ -29,12 +29,12 @@ type aplug struct {
 	// TODO: make Main() main() and never allow the user to call it
 	// run plugin.Main() when the plugin is loaded
 	Main func(func ())	// this never returns. Each plugin must have it's own goroutine
-	Queue func(func ())	// Should this return right away? Should it wait (can it wait?)
+	// Queue func(func ())	// Should this return right away? Should it wait (can it wait?)
 	Quit func()
 	// NewWindow func(*toolkit.Widget)
 
 	// simplifies passing to the plugin
-	Send func(*toolkit.Widget, *toolkit.Widget)
+	// Send func(*toolkit.Widget, *toolkit.Widget)
 
 	// should replace Send()
 	Action func(*toolkit.Action)
@@ -74,7 +74,7 @@ func LoadToolkit(name string) bool {
 	newPlug.Main  = loadFuncF(&newPlug, "Main")
 
 	// should send things to the goroutine above
-	newPlug.Queue = loadFuncF(&newPlug, "Queue")
+	// newPlug.Queue = loadFuncF(&newPlug, "Queue")
 
 	// unload the plugin and restore state
 	newPlug.Quit = loadFuncE(&newPlug, "Quit")

structs.go

@@ -2,6 +2,7 @@ package gui
 
 import (
 	"git.wit.org/wit/gui/toolkit"
+	"sync"
 )
 
 //
@@ -56,6 +57,7 @@ type GuiConfig struct {
 // simply the name and the size of whatever GUI element exists
 type Node struct {
 	id     int
+	initOnce sync.Once
 
 	widget	toolkit.Widget
 

toolkit/andlabs/add.go

@@ -35,9 +35,10 @@ func add(a *toolkit.Action) {
 
 	if (andlabs[a.WhereId] == nil) {
 		// listMap(debugError) // memory corruption?
-		log(debugError, "add() Widget.Name =", a.Title, a.WidgetT)
+		log(debugError, "add() Widget.Name =", a.Title)
-		// log(debugError, "add() Where.Name =", a.Where.Name)
+		log(debugError, "add() Widget.Type =", a.WidgetT)
-		log(debugError, "ERROR add() ERROR a.Where map to t == nil.", a.WidgetId, a.WhereId)
+		log(debugError, "ERROR add() ERROR a.Where map to t == nil. WidgetId =", a.WidgetId, "WhereId =", a.WhereId)
+		exit("can not add()")
 		return
 	}
 

toolkit/democui/,

@@ -0,0 +1,191 @@
+// Copyright 2014 The gocui Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+
+	"github.com/awesome-gocui/gocui"
+)
+
+func main() {
+	g, err := gocui.NewGui(gocui.OutputNormal, true)
+	if err != nil {
+		log.Panicln(err)
+	}
+	defer g.Close()
+
+	g.Cursor = false
+	g.Mouse = true
+
+	g.SetManagerFunc(layout)
+
+	if err := keybindings(g); err != nil {
+		log.Panicln(err)
+	}
+
+	if err := g.MainLoop(); err != nil && !errors.Is(err, gocui.ErrQuit) {
+		log.Panicln(err)
+	}
+}
+
+var initialMouseX, initialMouseY, xOffset, yOffset int
+var globalMouseDown, msgMouseDown, movingMsg bool
+
+func layout(g *gocui.Gui) error {
+	maxX, maxY := g.Size()
+	if _, err := g.View("msg"); msgMouseDown && err == nil {
+		moveMsg(g)
+	}
+	if v, err := g.SetView("global", -1, -1, maxX, maxY, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.Frame = false
+	}
+	if v, err := g.SetView("but1", 2, 2, 22, 7, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.SelBgColor = gocui.ColorGreen
+		v.SelFgColor = gocui.ColorBlack
+		fmt.Fprintln(v, "Button 1 - line 1")
+		fmt.Fprintln(v, "Button 1 - line 2")
+		fmt.Fprintln(v, "Button 1 - line 3")
+		fmt.Fprintln(v, "Button 1 - line 4")
+		if _, err := g.SetCurrentView("but1"); err != nil {
+			return err
+		}
+	}
+	if v, err := g.SetView("but2", 24, 2, 44, 4, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.SelBgColor = gocui.ColorGreen
+		v.SelFgColor = gocui.ColorBlack
+		fmt.Fprintln(v, "Button 2 - line 1")
+	}
+	updateHighlightedView(g)
+	return nil
+}
+
+func keybindings(g *gocui.Gui) error {
+	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
+		return err
+	}
+	for _, n := range []string{"but1", "but2"} {
+		if err := g.SetKeybinding(n, gocui.MouseLeft, gocui.ModNone, showMsg); err != nil {
+			return err
+		}
+	}
+	if err := g.SetKeybinding("", gocui.MouseRelease, gocui.ModNone, mouseUp); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("", gocui.MouseLeft, gocui.ModNone, globalDown); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("msg", gocui.MouseLeft, gocui.ModNone, msgDown); err != nil {
+		return err
+	}
+	return nil
+}
+
+func quit(g *gocui.Gui, v *gocui.View) error {
+	return gocui.ErrQuit
+}
+
+func showMsg(g *gocui.Gui, v *gocui.View) error {
+	var l string
+	var err error
+
+	if _, err := g.SetCurrentView(v.Name()); err != nil {
+		return err
+	}
+
+	_, cy := v.Cursor()
+	if l, err = v.Line(cy); err != nil {
+		l = ""
+	}
+
+	maxX, maxY := g.Size()
+	if v, err := g.SetView("msg", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2, 0); err == nil || errors.Is(err, gocui.ErrUnknownView) {
+		v.Clear()
+		v.SelBgColor = gocui.ColorCyan
+		v.SelFgColor = gocui.ColorBlack
+		fmt.Fprintln(v, l)
+	}
+	return nil
+}
+
+func updateHighlightedView(g *gocui.Gui) {
+	mx, my := g.MousePosition()
+	for _, view := range g.Views() {
+		view.Highlight = false
+	}
+	if v, err := g.ViewByPosition(mx, my); err == nil {
+		v.Highlight = true
+	}
+}
+
+func moveMsg(g *gocui.Gui) {
+	mx, my := g.MousePosition()
+	if !movingMsg && (mx != initialMouseX || my != initialMouseY) {
+		movingMsg = true
+	}
+	g.SetView("msg", mx-xOffset, my-yOffset, mx-xOffset+20, my-yOffset+2, 0)
+}
+
+func msgDown(g *gocui.Gui, v *gocui.View) error {
+	initialMouseX, initialMouseY = g.MousePosition()
+	if vx, vy, _, _, err := g.ViewPosition("msg"); err == nil {
+		xOffset = initialMouseX - vx
+		yOffset = initialMouseY - vy
+		msgMouseDown = true
+	}
+	return nil
+}
+
+func globalDown(g *gocui.Gui, v *gocui.View) error {
+	mx, my := g.MousePosition()
+	if vx0, vy0, vx1, vy1, err := g.ViewPosition("msg"); err == nil {
+		if mx >= vx0 && mx <= vx1 && my >= vy0 && my <= vy1 {
+			return msgDown(g, v)
+		}
+	}
+	globalMouseDown = true
+	maxX, _ := g.Size()
+	msg := fmt.Sprintf("Mouse down at: %d,%d", mx, my)
+	x := mx - len(msg)/2
+	if x < 0 {
+		x = 0
+	} else if x+len(msg)+1 > maxX-1 {
+		x = maxX - 1 - len(msg) - 1
+	}
+	if v, err := g.SetView("globalDown", x, my-1, x+len(msg)+1, my+1, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.WriteString(msg)
+	}
+	return nil
+}
+
+func mouseUp(g *gocui.Gui, v *gocui.View) error {
+	if msgMouseDown {
+		msgMouseDown = false
+		if movingMsg {
+			movingMsg = false
+			return nil
+		} else {
+			g.DeleteView("msg")
+		}
+	} else if globalMouseDown {
+		globalMouseDown = false
+		g.DeleteView("globalDown")
+	}
+	return nil
+}

toolkit/democui/help.go

@@ -0,0 +1,40 @@
+// Copyright 2014 The gocui Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/awesome-gocui/gocui"
+)
+
+func addHelp() {
+	baseGui.SetManagerFunc(helplayout)
+}
+
+func helplayout(g *gocui.Gui) error {
+	var err error
+	maxX, _ := g.Size()
+
+	helpLabel, err = g.SetView("help", maxX-32, 0, maxX-1, 12, 0)
+	if err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		fmt.Fprintln(helpLabel, "KEYBINDINGS")
+		fmt.Fprintln(helpLabel, "Enter: Click Button")
+		fmt.Fprintln(helpLabel, "Tab/Space: Switch Buttons")
+		fmt.Fprintln(helpLabel, "")
+		fmt.Fprintln(helpLabel, "h: Help")
+		fmt.Fprintln(helpLabel, "Backspace: Delete Button")
+		fmt.Fprintln(helpLabel, "Arrow keys: Move Button")
+		fmt.Fprintln(helpLabel, "t: Move Button to the top")
+		fmt.Fprintln(helpLabel, "b: Move Button to the button")
+		fmt.Fprintln(helpLabel, "STDOUT: /tmp/witgui.log")
+		fmt.Fprintln(helpLabel, "Ctrl-C or Q: Exit")
+	}
+	return nil
+}

toolkit/democui/log.go

@@ -5,7 +5,15 @@ import 	(
 	witlog "git.wit.org/wit/gui/log"
 )
 
+// various debugging flags
+var logNow bool = true	// useful for active development
+var logError bool = true
+var logWarn bool = false
+var logInfo bool = false
+var logVerbose bool = false
+
 func log(a ...any) {
+	witlog.Where = "wit/democui"
 	witlog.Log(a...)
 }
 

toolkit/democui/main.go

@@ -0,0 +1,58 @@
+// Copyright 2014 The gocui Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"os"
+)
+
+func OnExit(f func(string)) {
+	Custom = f
+}
+
+func Init() {
+	log("Init() of democui")
+}
+
+func Exit() {
+	g.Close()
+}
+
+func mouseClick(name string) {
+	// output screws up the console. Need to fix this by redirecting all console output to a file from log.Println()
+	// log.Println("g.Close()")
+	// g.Close()
+
+	log("Found andlabs Running custom function for the mouse click")
+	Custom(name)
+	// panic("got andlabs")
+}
+
+func Main(f func()) {
+	log("start Init()")
+
+	outf, err := os.OpenFile("/tmp/witgui.log", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
+	if err != nil {
+		exit("error opening file: %v", err)
+	}
+	defer outf.Close()
+
+	setOutput(outf)
+	log("This is a test log entry")
+
+	MouseMain()
+}
+
+/*
+func StartConsoleMouse() {
+	defer g.Close()
+	log("start Main()")
+
+	if err := g.MainLoop(); err != nil && !errors.Is(err, gocui.ErrQuit) {
+		exit(err)
+	}
+	log("exit Main()")
+}
+*/

toolkit/democui/mouse.go

@@ -7,49 +7,18 @@ package main
 import (
 	"errors"
 	"fmt"
-	"os"
 
 	"github.com/awesome-gocui/gocui"
 )
 
-var g *gocui.Gui
+func MouseMain() {
-var err error
+	g, err := gocui.NewGui(gocui.OutputNormal, true)
-var Custom func(string)
-
-func OnExit(f func(string)) {
-	Custom = f
-}
-
-func Exit() {
-	g.Close()
-}
-
-func mouseClick(name string) {
-	// output screws up the console. Need to fix this by redirecting all console output to a file from log.Println()
-	// log.Println("g.Close()")
-	// g.Close()
-
-	log("Found andlabs Running custom function for the mouse click")
-	Custom(name)
-	// panic("got andlabs")
-}
-
-func Init() {
-	log("start Init()")
-
-	f, err := os.OpenFile("/tmp/guilogfile", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
 	if err != nil {
-		exit("error opening file: %v", err)
+		panic(err)
 	}
-	defer f.Close()
+	defer g.Close()
 
-	setOutput(f)
+	baseGui = g
-	log("This is a test log entry")
-
-	g, err = gocui.NewGui(gocui.OutputNormal, true)
-	if err != nil {
-		exit(err)
-	}
 
 	g.Cursor = true
 	g.Mouse = true
@@ -57,35 +26,35 @@ func Init() {
 	g.SetManagerFunc(layout)
 
 	if err := keybindings(g); err != nil {
-		exit(err)
+		panic(err)
 	}
-	log("exit Init()")
-}
-
-func StartConsoleMouse() {
-	defer g.Close()
-	log("start Main()")
 
 	if err := g.MainLoop(); err != nil && !errors.Is(err, gocui.ErrQuit) {
-		exit(err)
+		panic(err)
 	}
-	log("exit Main()")
 }
 
 func layout(g *gocui.Gui) error {
-	if v, err := g.SetView("but1", 2, 2, 22, 17, 0); err != nil {
+	maxX, maxY := g.Size()
+	if _, err := g.View("msg"); msgMouseDown && err == nil {
+		moveMsg(g)
+	}
+	if v, err := g.SetView("global", -1, -1, maxX, maxY, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.Frame = false
+	}
+	if v, err := g.SetView("but1", 2, 2, 22, 7, 0); err != nil {
 		if !errors.Is(err, gocui.ErrUnknownView) {
 			return err
 		}
-		v.Highlight = true
 		v.SelBgColor = gocui.ColorGreen
 		v.SelFgColor = gocui.ColorBlack
-		fmt.Fprintln(v, "andlabs")
+		fmt.Fprintln(v, "Button 1 - line 1")
-		fmt.Fprintln(v, "addDemoTab")
+		fmt.Fprintln(v, "Button 1 - line 2")
-		fmt.Fprintln(v, "DemoToolkitWindow")
+		fmt.Fprintln(v, "Button 1 - line 3")
-		fmt.Fprintln(v, "DebugWindow")
+		fmt.Fprintln(v, "Button 1 - line 4")
-		fmt.Fprintln(v, "do nothing")
-		fmt.Fprintln(v, "exit")
 		if _, err := g.SetCurrentView("but1"); err != nil {
 			return err
 		}
@@ -94,38 +63,12 @@ func layout(g *gocui.Gui) error {
 		if !errors.Is(err, gocui.ErrUnknownView) {
 			return err
 		}
-		v.Highlight = true
-		v.SelBgColor = gocui.ColorGreen
-		v.SelFgColor = gocui.ColorBlack
-		fmt.Fprintln(v, "Button 2 - line 1")
-	}
-	if v, err := g.SetView("but3", 24, 2, 44, 4, 0); err != nil {
-		if !errors.Is(err, gocui.ErrUnknownView) {
-			return err
-		}
-		v.Highlight = true
-		v.SelBgColor = gocui.ColorGreen
-		v.SelFgColor = gocui.ColorBlack
-		fmt.Fprintln(v, "Button 2 - line 1")
-	}
-	if v, err := g.SetView("but4", 24, 2, 44, 4, 0); err != nil {
-		if !errors.Is(err, gocui.ErrUnknownView) {
-			return err
-		}
-		v.Highlight = true
-		v.SelBgColor = gocui.ColorGreen
-		v.SelFgColor = gocui.ColorBlack
-		fmt.Fprintln(v, "Button 2 - line 1")
-	}
-	if v, err := g.SetView("but5", 24, 2, 44, 4, 0); err != nil {
-		if !errors.Is(err, gocui.ErrUnknownView) {
-			return err
-		}
-		v.Highlight = true
 		v.SelBgColor = gocui.ColorGreen
 		v.SelFgColor = gocui.ColorBlack
 		fmt.Fprintln(v, "Button 2 - line 1")
 	}
+	helplayout(g)
+	updateHighlightedView(g)
 	return nil
 }
 
@@ -138,13 +81,13 @@ func keybindings(g *gocui.Gui) error {
 			return err
 		}
 	}
-	if err := g.SetKeybinding("msg", gocui.MouseLeft, gocui.ModNone, delMsg); err != nil {
+	if err := g.SetKeybinding("", gocui.MouseRelease, gocui.ModNone, mouseUp); err != nil {
 		return err
 	}
-	if err := g.SetKeybinding("", gocui.MouseRight, gocui.ModNone, delMsg); err != nil {
+	if err := g.SetKeybinding("", gocui.MouseLeft, gocui.ModNone, globalDown); err != nil {
 		return err
 	}
-	if err := g.SetKeybinding("", gocui.MouseMiddle, gocui.ModNone, delMsg); err != nil {
+	if err := g.SetKeybinding("msg", gocui.MouseLeft, gocui.ModNone, msgDown); err != nil {
 		return err
 	}
 	return nil
@@ -168,18 +111,80 @@ func showMsg(g *gocui.Gui, v *gocui.View) error {
 	}
 
 	maxX, maxY := g.Size()
-	if v, err := g.SetView("msg", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2, 0); err != nil {
+	if v, err := g.SetView("msg", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2, 0); err == nil || errors.Is(err, gocui.ErrUnknownView) {
-		if !errors.Is(err, gocui.ErrUnknownView) {
+		v.Clear()
-			return err
+		v.SelBgColor = gocui.ColorCyan
-		}
+		v.SelFgColor = gocui.ColorBlack
-		mouseClick(l)
 		fmt.Fprintln(v, l)
 	}
 	return nil
 }
 
-func delMsg(g *gocui.Gui, v *gocui.View) error {
+func updateHighlightedView(g *gocui.Gui) {
-	// Error check removed, because delete could be called multiple times with the above keybindings
+	mx, my := g.MousePosition()
-	g.DeleteView("msg")
+	for _, view := range g.Views() {
+		view.Highlight = false
+	}
+	if v, err := g.ViewByPosition(mx, my); err == nil {
+		v.Highlight = true
+	}
+}
+
+func moveMsg(g *gocui.Gui) {
+	mx, my := g.MousePosition()
+	if !movingMsg && (mx != initialMouseX || my != initialMouseY) {
+		movingMsg = true
+	}
+	g.SetView("msg", mx-xOffset, my-yOffset, mx-xOffset+20, my-yOffset+2, 0)
+}
+
+func msgDown(g *gocui.Gui, v *gocui.View) error {
+	initialMouseX, initialMouseY = g.MousePosition()
+	if vx, vy, _, _, err := g.ViewPosition("msg"); err == nil {
+		xOffset = initialMouseX - vx
+		yOffset = initialMouseY - vy
+		msgMouseDown = true
+	}
+	return nil
+}
+
+func globalDown(g *gocui.Gui, v *gocui.View) error {
+	mx, my := g.MousePosition()
+	if vx0, vy0, vx1, vy1, err := g.ViewPosition("msg"); err == nil {
+		if mx >= vx0 && mx <= vx1 && my >= vy0 && my <= vy1 {
+			return msgDown(g, v)
+		}
+	}
+	globalMouseDown = true
+	maxX, _ := g.Size()
+	msg := fmt.Sprintf("Mouse down at: %d,%d", mx, my)
+	x := mx - len(msg)/2
+	if x < 0 {
+		x = 0
+	} else if x+len(msg)+1 > maxX-1 {
+		x = maxX - 1 - len(msg) - 1
+	}
+	if v, err := g.SetView("globalDown", x, my-1, x+len(msg)+1, my+1, 0); err != nil {
+		if !errors.Is(err, gocui.ErrUnknownView) {
+			return err
+		}
+		v.WriteString(msg)
+	}
+	return nil
+}
+
+func mouseUp(g *gocui.Gui, v *gocui.View) error {
+	if msgMouseDown {
+		msgMouseDown = false
+		if movingMsg {
+			movingMsg = false
+			return nil
+		} else {
+			g.DeleteView("msg")
+		}
+	} else if globalMouseDown {
+		globalMouseDown = false
+		g.DeleteView("globalDown")
+	}
 	return nil
 }

toolkit/democui/plugin.go

@@ -113,3 +113,19 @@ func Send(p *toolkit.Widget, c *toolkit.Widget) {
 		log(debugError, "plugin Send() Don't know how to do", c.Type, "yet")
 	}
 }
+
+func Action(a *toolkit.Action) {
+	log(logNow, "Action() START a.Type =", a.Type)
+	log(logNow, "Action() START a.S =", a.S)
+	log(logNow, "Action() START a.Widget =", a.Widget)
+
+	log(logNow, "Action() START a.WidgetId =", a.WidgetId, "a.WhereId =", a.WhereId)
+
+	switch a.Type {
+	case toolkit.Add:
+		log(logError, "Action() do add here() =", a.Type, a.Widget)
+	default:
+		log(logError, "Action() Unknown =", a.Type, a.Widget)
+	}
+	log(logNow, "Action() END =", a.Type, a.Widget)
+}

toolkit/democui/structs.go

@@ -0,0 +1,32 @@
+// Copyright 2014 The gocui Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"os"
+	"github.com/awesome-gocui/gocui"
+)
+
+const delta = 1
+
+var (
+	g *gocui.Gui
+	Custom func(string)
+
+	initialMouseX, initialMouseY, xOffset, yOffset int
+	globalMouseDown, msgMouseDown, movingMsg bool
+
+	views   = []string{}
+	curView = -1
+	idxView = 0
+	currentX = 5
+	currentY = 2
+	groupSize = 0
+	baseGui *gocui.Gui
+	helpLabel *gocui.View
+	err error
+	ch chan(func ())
+	outf *os.File
+)