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// Copyright 2019-2022 Graham Clark. All rights reserved. Use of this source
// code is governed by the MIT license that can be found in the LICENSE
// file.
// A demonstration of gowid's tree widget.
package main
import (
"fmt"
"github.com/gcla/gowid"
"github.com/gcla/gowid/examples"
"github.com/gcla/gowid/gwutil"
"github.com/gcla/gowid/widgets/button"
"github.com/gcla/gowid/widgets/checkbox"
"github.com/gcla/gowid/widgets/columns"
"github.com/gcla/gowid/widgets/framed"
"github.com/gcla/gowid/widgets/list"
"github.com/gcla/gowid/widgets/palettemap"
"github.com/gcla/gowid/widgets/selectable"
"github.com/gcla/gowid/widgets/styled"
"github.com/gcla/gowid/widgets/text"
"github.com/gcla/gowid/widgets/tree"
tcell "github.com/gdamore/tcell/v2"
log "github.com/sirupsen/logrus"
)
var pos *tree.TreePos
var tb *list.Widget
var parent1 *tree.Collapsible
var walker *tree.TreeWalker
//======================================================================
func MakeDemoDecoration(pos tree.IPos, tr tree.IModel, wmaker tree.IWidgetMaker) gowid.IWidget {
var res gowid.IWidget
level := -1
for cur := pos; cur != nil; cur = tree.ParentPosition(cur) {
level += 1
}
pad := gwutil.StringOfLength(' ', level*10)
cwidgets := make([]gowid.IContainerWidget, 0)
cwidgets = append(cwidgets, &gowid.ContainerWidget{text.New(pad), gowid.RenderWithUnits{U: len(pad)}})
if ct, ok := tr.(tree.ICollapsible); ok {
var bn *button.Widget
if ct.IsCollapsed() {
bn = button.New(text.New("+"))
} else {
bn = button.New(text.New("-"))
}
// If I use one button with conditional logic in the callback, rather than make
// a separate button depending on whether or not the tree is collapsed, it will
// correctly work when the DecoratorMaker is caching the widgets i.e. it will
// collapse or expand even when the widget is rendered from the cache
bn.OnClick(gowid.WidgetCallback{"cb", func(app gowid.IApp, w gowid.IWidget) {
// Run this outside current event loop because we are implicitly
// adjusting the data structure behind the list walker, and it's
// not prepared to handle that in the same pass of processing
// UserInput. TODO.
app.Run(gowid.RunFunction(func(app gowid.IApp) {
ct.SetCollapsed(app, !ct.IsCollapsed())
}))
}})
cwidgets = append(cwidgets, &gowid.ContainerWidget{
framed.NewUnicode(
styled.NewExt(
bn,
gowid.MakePaletteRef("body"),
gowid.MakePaletteRef("fbody"),
),
),
gowid.RenderFixed{},
})
}
inner := wmaker.MakeWidget(pos, tr)
cwidgets = append(cwidgets, &gowid.ContainerWidget{inner, gowid.RenderFixed{}})
res = palettemap.New(
columns.New(cwidgets),
palettemap.Map{"body": "fbody"},
palettemap.Map{},
)
return res
}
func MakeDemoWidget(pos tree.IPos, tr tree.IModel) gowid.IWidget {
var res gowid.IWidget
cbox := checkbox.New(false)
cbox.OnClick(gowid.WidgetCallback{"cb", func(app gowid.IApp, w gowid.IWidget) {
log.Info("Clicked checkbox in tree")
}})
res = columns.New([]gowid.IContainerWidget{
&gowid.ContainerWidget{
framed.NewUnicode(cbox),
gowid.RenderFixed{},
},
&gowid.ContainerWidget{
styled.NewExt(
framed.NewUnicode(
selectable.New(
text.NewFromContent(
text.NewContent(
[]text.ContentSegment{
text.StyledContent(
fmt.Sprintf("tr %s:%v", tr.Leaf(), pos.String()),
gowid.MakePaletteRef("body"),
),
},
),
),
),
),
gowid.MakePaletteRef("body"),
gowid.MakePaletteRef("fbody"),
),
gowid.RenderFixed{},
},
})
return res
}
//======================================================================
type handler struct{}
func (h handler) UnhandledInput(app gowid.IApp, ev interface{}) bool {
handled := false
if evk, ok := ev.(*tcell.EventKey); ok {
handled = true
if evk.Key() == tcell.KeyCtrlC || evk.Rune() == 'q' || evk.Rune() == 'Q' {
app.Quit()
} else if evk.Rune() == 'x' {
f := walker.Focus()
f2 := f.(tree.IPos)
s := f2.GetSubStructure(parent1)
if t2, ok := s.(tree.ICollapsible); ok {
t2.SetCollapsed(app, true)
}
} else if evk.Rune() == 'z' {
f := walker.Focus()
f2 := f.(tree.IPos)
s := f2.GetSubStructure(parent1)
if t2, ok := s.(tree.ICollapsible); ok {
t2.SetCollapsed(app, false)
}
} else {
handled = false
}
}
return handled
}
//======================================================================
func main() {
f := examples.RedirectLogger("tree1.log")
defer f.Close()
palette := gowid.Palette{
"title": gowid.MakePaletteEntry(gowid.ColorWhite, gowid.ColorBlack),
"key": gowid.MakePaletteEntry(gowid.ColorCyan, gowid.ColorBlack),
"foot": gowid.MakePaletteEntry(gowid.ColorWhite, gowid.ColorBlack),
"body": gowid.MakePaletteEntry(gowid.ColorBlack, gowid.ColorCyan),
"fbody": gowid.MakePaletteEntry(gowid.ColorWhite, gowid.ColorBlack),
}
body := gowid.MakePaletteRef("body")
leaf1 := tree.NewTree("leaf1", []tree.IModel{})
leaf2 := tree.NewTree("leaf2", []tree.IModel{})
leaf3 := tree.NewTree("leaf3", []tree.IModel{})
leaf4 := tree.NewTree("leaf4", []tree.IModel{})
leaf5 := tree.NewTree("leaf5", []tree.IModel{})
leaf21 := tree.NewTree("leaf21", []tree.IModel{})
leaf22 := tree.NewTree("leaf22", []tree.IModel{})
leaf23 := tree.NewTree("leaf23", []tree.IModel{})
stree1 := tree.NewCollapsible("stree1", []tree.IModel{leaf4, leaf5})
stree2 := tree.NewCollapsible("stree2", []tree.IModel{leaf21, leaf22, leaf23})
parent1 = tree.NewCollapsible("parent1", []tree.IModel{leaf1, stree1, leaf2, stree2, leaf3})
parent1.AddOnExpanded("exp", tree.ExpandedFunction(func(app gowid.IApp) {
ch := parent1.GetChildren()
newLeaf := tree.NewTree("foo", []tree.IModel{})
parent1.SetChildren(append([]tree.IModel{newLeaf}, ch...))
}))
pos = tree.NewPos()
walker = tree.NewWalker(parent1, pos,
tree.NewCachingMaker(tree.WidgetMakerFunction(MakeDemoWidget)),
tree.NewCachingDecorator(tree.DecoratorFunction(MakeDemoDecoration)))
tb = tree.New(walker)
tb.OnFocusChanged(gowid.WidgetCallback{"cb", func(app gowid.IApp, w gowid.IWidget) {
log.Infof("Focus changed - widget is now %v", w)
}})
view := styled.New(tb, body)
app, err := gowid.NewApp(gowid.AppArgs{
View: view,
Palette: &palette,
Log: log.StandardLogger(),
})
examples.ExitOnErr(err)
app.MainLoop(handler{})
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
