Inevitabby
9a8bc6c936
* fix: ensure load callback fires on error Calls callOnLoaded(nil) when image loading fails. This fixes the bottomplayer silently retaining stale images by ensuring consumers always get a callback and can clear their display state. * fix: clear background layers on missing art nil state now hides the blurred background widgets or animates the gradient to transparent, depending on the active configuration
71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package util
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import (
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"context"
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"image"
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"log"
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"fyne.io/fyne/v2"
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)
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// ThumbnailLoader is a utility type that exposes a single API to load
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// a cover thumbnail by ID. If the image is immediately available in
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// the cache, OnLoaded will be called immediately. If it is not,
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// OnBeforeLoad will be called first, then OnLoaded will be called async
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// once the image is available.
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// Any subsequent calls to Load will cancel the previous load if not yet completed.
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type ThumbnailLoader struct {
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prevLoadCancel context.CancelFunc
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im ImageFetcher
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OnBeforeLoad func()
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OnLoaded func(image.Image)
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}
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// Image backend interface for the ThumbnailLoader
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// impl: backend.ImageManager
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type ImageFetcher interface {
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GetCoverThumbnailFromCache(string) (image.Image, bool)
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GetCoverThumbnailAsync(string, func(image.Image, error)) context.CancelFunc
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}
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func NewThumbnailLoader(im ImageFetcher, onLoaded func(image.Image)) ThumbnailLoader {
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return ThumbnailLoader{im: im, OnLoaded: onLoaded}
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}
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func (i *ThumbnailLoader) Load(coverID string) {
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if i.prevLoadCancel != nil {
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i.prevLoadCancel()
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}
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if coverID == "" {
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i.callOnLoaded(nil)
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return
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}
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if img, ok := i.im.GetCoverThumbnailFromCache(coverID); ok {
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i.callOnLoaded(img)
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return
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}
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if i.OnBeforeLoad != nil {
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i.OnBeforeLoad()
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}
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i.prevLoadCancel = i.im.GetCoverThumbnailAsync(coverID, func(img image.Image, err error) {
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fyne.Do(func() {
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if err != nil {
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log.Printf("Error loading cover image: %s", err.Error())
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i.callOnLoaded(nil)
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} else {
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i.callOnLoaded(img)
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}
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if i.prevLoadCancel != nil {
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i.prevLoadCancel() // Cancel the context to release resources if not already cancelled
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}
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})
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})
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}
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func (i *ThumbnailLoader) callOnLoaded(im image.Image) {
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if i.OnLoaded != nil {
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i.OnLoaded(im)
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}
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}
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