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utils.go
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utils.go
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package gui
import (
"sync"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/widget"
"go.uber.org/multierr"
)
// MISC
func mergeCleaners(cleaners ...func() error) func() error {
return func() error {
errs := []error(nil)
for _, cleaner := range cleaners {
if cleaner != nil {
if err := cleaner(); err != nil {
errs = append(errs, err)
}
}
}
return multierr.Combine(errs...)
}
}
func safeShortPK(pk string) string {
if len(pk) < 7 {
return "ano1337"
}
return pk[:7]
}
// SYNC
func autoLock(mu sync.Locker) func() {
mu.Lock()
return mu.Unlock
}
// DYNAMIC LIST WIDGET
type dynamicStringKeyedList struct {
views map[string]wfr
container *fyne.Container
mu *sync.Mutex
cmp func(string, string) int
}
func newDynamicStringKeyedList(containerFactory func(...fyne.CanvasObject) *fyne.Container) *dynamicStringKeyedList {
c := containerFactory()
list := dynamicStringKeyedList{
views: make(map[string]wfr),
container: c,
mu: &sync.Mutex{},
}
return &list
}
func (list *dynamicStringKeyedList) unsafeRefresh() {
objs := []fyne.CanvasObject(nil)
keys := []string(nil)
for k, wfr := range list.views {
objs = append(objs, wfr.object)
keys = append(keys, k)
}
list.container.Objects = objs
if list.cmp != nil {
// FIXME: replace with real sort
items := list.container.Objects
n := len(items) // https://www.golangprograms.com/golang-program-for-implementation-of-insertionsort.html
for i := 1; i < n; i++ {
j := i
for j > 0 {
if list.cmp(keys[j-1], keys[j]) > 0 {
items[j-1], items[j] = items[j], items[j-1]
keys[j-1], keys[j] = keys[j], keys[j-1]
}
j--
}
}
}
list.container.Refresh()
}
func (list *dynamicStringKeyedList) remove(key string) error {
defer autoLock(list.mu)()
clean := (func() error)(nil)
if view, ok := list.views[key]; ok {
clean = view.clean
}
delete(list.views, key)
list.unsafeRefresh()
if clean != nil {
return clean()
}
return nil
}
func (list *dynamicStringKeyedList) clean() error {
defer autoLock(list.mu)()
cleaners := ([]func() error)(nil)
for _, v := range list.views {
cleaners = append(cleaners, v.clean)
}
return mergeCleaners(cleaners...)()
}
func (list *dynamicStringKeyedList) add(key string, factory func() wfr) error {
defer autoLock(list.mu)()
if _, ok := list.views[key]; !ok {
wfr := factory()
if wfr.err != nil {
return wfr.err
}
list.views[key] = wfr
list.unsafeRefresh()
}
return nil
}
func (list *dynamicStringKeyedList) empty() bool {
defer autoLock(list.mu)()
return len(list.container.Objects) == 0
}
func (list *dynamicStringKeyedList) setSort(cmp func(string, string) int) {
defer autoLock(list.mu)()
list.cmp = cmp
}
// ENTER ENTRY
// https://developer.fyne.io/tutorial/keypress-on-entry
type enterEntry struct {
widget.Entry
onEnter func()
}
func newEnterEntry() *enterEntry {
entry := &enterEntry{}
entry.ExtendBaseWidget(entry)
return entry
}
func (e *enterEntry) TypedKey(key *fyne.KeyEvent) {
switch key.Name {
case fyne.KeyReturn:
if e.onEnter != nil {
e.onEnter()
}
default:
e.Entry.TypedKey(key)
}
}
// SEPARATOR
func newSeparator(mc *msgrContext) wfr { return wfr{widget.NewSeparator(), nil, nil} }