A simple number "spinner" widget

This widget renders something like "15 [^v]". If you click the "^"
button, the value increases by one; or "v" will decrease the value by
one. I haven't tried to make this sophisticated at all, so there aren't
configurable keys yet, or increments/decrements by values other than
one. If needed, I'll add them later. I am going to use this to all
configuring the custom columns' occurrences field.

widgets/number/number.go

@@ -0,0 +1,141 @@
+// Copyright 2019-2021 Graham Clark. All rights reserved.  Use of this source
+// code is governed by the MIT license that can be found in the LICENSE
+// file.
+
+// Package hexdumper provides a numeric widget with a couple of buttons that increase or decrease its value.
+package number
+
+import (
+	"fmt"
+
+	"github.com/gcla/gowid"
+	"github.com/gcla/gowid/gwutil"
+	"github.com/gcla/gowid/widgets/button"
+	"github.com/gcla/gowid/widgets/columns"
+	"github.com/gcla/gowid/widgets/fill"
+	"github.com/gcla/gowid/widgets/holder"
+	"github.com/gcla/gowid/widgets/hpadding"
+	"github.com/gcla/gowid/widgets/text"
+)
+
+//======================================================================
+
+type Options struct {
+	Value  int
+	Max    gwutil.IntOption
+	Min    gwutil.IntOption
+	Styler func(gowid.IWidget) gowid.IWidget
+}
+
+type Widget struct {
+	gowid.IWidget
+	up        *button.Widget
+	down      *button.Widget
+	valHolder *holder.Widget
+	Value     int
+	Opt       Options
+}
+
+var _ gowid.IWidget = (*Widget)(nil)
+
+var blank *hpadding.Widget
+var upArrow *text.Widget
+var downArrow *text.Widget
+var leftbr *text.Widget
+var rightbr *text.Widget
+
+func init() {
+	blank = hpadding.New(
+		fill.New(' '),
+		gowid.HAlignLeft{},
+		gowid.RenderWithUnits{U: 1},
+	)
+
+	leftbr = text.New("[")
+	rightbr = text.New("]")
+	upArrow = text.New("^")
+	downArrow = text.New("v")
+}
+
+func New(opts ...Options) *Widget {
+
+	var opt Options
+	if len(opts) > 0 {
+		opt = opts[0]
+	}
+
+	res := &Widget{
+		valHolder: holder.New(text.New(fmt.Sprintf("%d", opt.Value))),
+		Value:     opt.Value,
+	}
+
+	up := button.NewBare(upArrow)
+
+	up.OnClick(gowid.MakeWidgetCallback("cb", func(app gowid.IApp, widget gowid.IWidget) {
+		if !res.Opt.Max.IsNone() && res.Value >= res.Opt.Max.Val() {
+			res.Value = res.Opt.Max.Val()
+		} else {
+			res.Value += 1
+		}
+		res.valHolder.SetSubWidget(text.New(fmt.Sprintf("%d", res.Value)), app)
+	}))
+
+	down := button.NewBare(downArrow)
+
+	down.OnClick(gowid.MakeWidgetCallback("cb", func(app gowid.IApp, widget gowid.IWidget) {
+		if !res.Opt.Min.IsNone() && res.Value <= res.Opt.Min.Val() {
+			res.Value = res.Opt.Min.Val()
+		} else {
+			res.Value -= 1
+		}
+		res.valHolder.SetSubWidget(text.New(fmt.Sprintf("%d", res.Value)), app)
+	}))
+
+	styler := opt.Styler
+	if styler == nil {
+		styler = func(w gowid.IWidget) gowid.IWidget {
+			return w
+		}
+	}
+
+	cols := columns.New([]gowid.IContainerWidget{
+		&gowid.ContainerWidget{
+			IWidget: res.valHolder,
+			D:       gowid.RenderFixed{},
+			//D:       gowid.RenderWithWeight{W: 1},
+		},
+		&gowid.ContainerWidget{
+			IWidget: blank,
+			D:       gowid.RenderWithUnits{U: 1},
+		},
+		&gowid.ContainerWidget{
+			IWidget: leftbr,
+			D:       gowid.RenderFixed{},
+		},
+		&gowid.ContainerWidget{
+			IWidget: styler(up),
+			D:       gowid.RenderFixed{},
+		},
+		&gowid.ContainerWidget{
+			IWidget: styler(down),
+			D:       gowid.RenderFixed{},
+		},
+		&gowid.ContainerWidget{
+			IWidget: rightbr,
+			D:       gowid.RenderFixed{},
+		},
+	})
+
+	res.IWidget = cols
+	res.Opt = opt
+	res.up = up
+	res.down = down
+
+	return res
+}
+
+//======================================================================
+// Local Variables:
+// mode: Go
+// fill-column: 110
+// End:

widgets/number/number_test.go

@@ -0,0 +1,61 @@
+// Copyright 2019-2021 Graham Clark. All rights reserved.  Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
+package number
+
+import (
+	"testing"
+
+	"github.com/gcla/gowid"
+	"github.com/gcla/gowid/gwtest"
+	"github.com/gdamore/tcell"
+	log "github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/assert"
+)
+
+//======================================================================
+
+func evclick(x, y int) *tcell.EventMouse {
+	return tcell.NewEventMouse(x, y, tcell.Button1, 0)
+}
+
+func evunclick(x, y int) *tcell.EventMouse {
+	return tcell.NewEventMouse(x, y, tcell.ButtonNone, 0)
+}
+
+func TestNumber1(t *testing.T) {
+	v := 2
+
+	w := New(Options{
+		Value: v,
+	})
+	sz := gowid.RenderFixed{}
+
+	c1 := w.Render(sz, gowid.NotSelected, gwtest.D)
+	log.Infof("Canvas is %s", c1.String())
+	// "0 [^v]"
+	assert.Equal(t, 1, c1.BoxRows())
+
+	clickat := func(x, y int) {
+		w.UserInput(evclick(x, y), sz, gowid.Focused, gwtest.D)
+		gwtest.D.SetLastMouseState(gowid.MouseState{true, false, false})
+		w.UserInput(evunclick(x, y), sz, gowid.Focused, gwtest.D)
+		gwtest.D.SetLastMouseState(gowid.MouseState{false, false, false})
+	}
+
+	clickat(2, 0)
+	assert.Equal(t, v, w.Value)
+
+	clickat(3, 0)
+	assert.Equal(t, v+1, w.Value)
+
+	clickat(4, 0)
+	clickat(4, 0)
+	assert.Equal(t, v+1-2, w.Value)
+}
+
+//======================================================================
+// Local Variables:
+// mode: Go
+// fill-column: 110
+// End: