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preferences.go
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preferences.go
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package internal
import (
"sync"
"fyne.io/fyne/v2"
)
// InMemoryPreferences provides an implementation of the fyne.Preferences API that is stored in memory.
type InMemoryPreferences struct {
values map[string]interface{}
lock sync.RWMutex
changeListeners []func()
wg *sync.WaitGroup
}
// Declare conformity with Preferences interface
var _ fyne.Preferences = (*InMemoryPreferences)(nil)
// AddChangeListener allows code to be notified when some preferences change. This will fire on any update.
// The passed 'listener' should not try to write values.
func (p *InMemoryPreferences) AddChangeListener(listener func()) {
p.lock.Lock()
defer p.lock.Unlock()
p.changeListeners = append(p.changeListeners, listener)
}
// ReadValues provides read access to the underlying value map - for internal use only...
// You should not retain a reference to the map nor write to the values in the callback function
func (p *InMemoryPreferences) ReadValues(fn func(map[string]interface{})) {
p.lock.RLock()
fn(p.values)
p.lock.RUnlock()
}
// WriteValues provides write access to the underlying value map - for internal use only...
// You should not retain a reference to the map passed to the callback function
func (p *InMemoryPreferences) WriteValues(fn func(map[string]interface{})) {
p.lock.Lock()
fn(p.values)
p.lock.Unlock()
p.fireChange()
}
func (p *InMemoryPreferences) set(key string, value interface{}) {
p.lock.Lock()
if stored, ok := p.values[key]; ok && stored == value {
p.lock.Unlock()
return
}
p.values[key] = value
p.lock.Unlock()
p.fireChange()
}
func (p *InMemoryPreferences) get(key string) (interface{}, bool) {
p.lock.RLock()
defer p.lock.RUnlock()
v, err := p.values[key]
return v, err
}
func (p *InMemoryPreferences) remove(key string) {
p.lock.Lock()
defer p.lock.Unlock()
delete(p.values, key)
}
func (p *InMemoryPreferences) fireChange() {
p.lock.RLock()
listeners := p.changeListeners
p.lock.RUnlock()
for _, l := range listeners {
p.wg.Add(1)
go func(listener func()) {
defer p.wg.Done()
listener()
}(l)
}
p.wg.Wait()
}
// Bool looks up a boolean value for the key
func (p *InMemoryPreferences) Bool(key string) bool {
return p.BoolWithFallback(key, false)
}
// BoolWithFallback looks up a boolean value and returns the given fallback if not found
func (p *InMemoryPreferences) BoolWithFallback(key string, fallback bool) bool {
value, ok := p.get(key)
if !ok {
return fallback
}
val, ok := value.(bool)
if !ok {
return false
}
return val
}
// SetBool saves a boolean value for the given key
func (p *InMemoryPreferences) SetBool(key string, value bool) {
p.set(key, value)
}
// Float looks up a float64 value for the key
func (p *InMemoryPreferences) Float(key string) float64 {
return p.FloatWithFallback(key, 0.0)
}
// FloatWithFallback looks up a float64 value and returns the given fallback if not found
func (p *InMemoryPreferences) FloatWithFallback(key string, fallback float64) float64 {
value, ok := p.get(key)
if !ok {
return fallback
}
val, ok := value.(float64)
if !ok {
return 0.0
}
return val
}
// SetFloat saves a float64 value for the given key
func (p *InMemoryPreferences) SetFloat(key string, value float64) {
p.set(key, value)
}
// Int looks up an integer value for the key
func (p *InMemoryPreferences) Int(key string) int {
return p.IntWithFallback(key, 0)
}
// IntWithFallback looks up an integer value and returns the given fallback if not found
func (p *InMemoryPreferences) IntWithFallback(key string, fallback int) int {
value, ok := p.get(key)
if !ok {
return fallback
}
// integers can be de-serialised as floats, so support both
if intVal, ok := value.(int); ok {
return intVal
}
val, ok := value.(float64)
if !ok {
return 0
}
return int(val)
}
// SetInt saves an integer value for the given key
func (p *InMemoryPreferences) SetInt(key string, value int) {
p.set(key, value)
}
// String looks up a string value for the key
func (p *InMemoryPreferences) String(key string) string {
return p.StringWithFallback(key, "")
}
// StringWithFallback looks up a string value and returns the given fallback if not found
func (p *InMemoryPreferences) StringWithFallback(key, fallback string) string {
value, ok := p.get(key)
if !ok {
return fallback
}
return value.(string)
}
// SetString saves a string value for the given key
func (p *InMemoryPreferences) SetString(key string, value string) {
p.set(key, value)
}
// RemoveValue deletes a value on the given key
func (p *InMemoryPreferences) RemoveValue(key string) {
p.remove(key)
}
// NewInMemoryPreferences creates a new preferences implementation stored in memory
func NewInMemoryPreferences() *InMemoryPreferences {
return &InMemoryPreferences{
values: make(map[string]interface{}),
wg: &sync.WaitGroup{},
}
}