move search bar to within albums page (right hand side)

ui/widgets/searcher.go

@@ -0,0 +1,63 @@
+package widgets
+
+import (
+	"sync"
+	"time"
+)
+
+type Searcher struct {
+	Entry      *SearchEntry
+	OnSearched func(string)
+
+	searchGoroutine   bool
+	pendingSearch     bool
+	pendingSearchLock sync.Mutex
+}
+
+func NewSearcher() *Searcher {
+	s := &Searcher{
+		Entry: NewSearchEntry(),
+	}
+	s.Entry.OnTextChanged = s.onSearchTextChanged
+	return s
+}
+
+func (s *Searcher) onSearchTextChanged(text string) {
+	if text == "" {
+		s.sendSearch("")
+		return
+	}
+	s.pendingSearchLock.Lock()
+	defer s.pendingSearchLock.Unlock()
+	s.pendingSearch = true
+	if !s.searchGoroutine {
+		go s.waitAndSearch()
+		s.searchGoroutine = true
+	}
+}
+
+func (s *Searcher) waitAndSearch() {
+	t := time.NewTicker(200 * time.Millisecond)
+	var getReadyToSearch bool
+	var done bool
+	for !done {
+		<-t.C
+		s.pendingSearchLock.Lock()
+		if s.pendingSearch {
+			getReadyToSearch = true
+			s.pendingSearch = false
+		} else if getReadyToSearch {
+			s.sendSearch(s.Entry.Text)
+			t.Stop()
+			s.searchGoroutine = false
+			done = true
+		}
+		s.pendingSearchLock.Unlock()
+	}
+}
+
+func (s *Searcher) sendSearch(text string) {
+	if s.OnSearched != nil {
+		s.OnSearched(text)
+	}
+}