From cd76702ab21bfe39c7b1804f63caf8994c435ced Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Thu, 14 Nov 2024 12:26:22 +0100
Subject: xA/xW: dehighlight current buffer appropriately

---
 xA/xA.go | 148 ++++++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 81 insertions(+), 67 deletions(-)

(limited to 'xA/xA.go')

diff --git a/xA/xA.go b/xA/xA.go
index 2cf2796..17a0400 100644
--- a/xA/xA.go
+++ b/xA/xA.go
@@ -363,16 +363,18 @@ func bufferByName(name string) *buffer {
 	return nil
 }
 
-func bufferActivate(name string) {
-	relaySend(RelayCommandData{
-		Variant: &RelayCommandDataBufferActivate{BufferName: name},
-	}, nil)
+func bufferAtBottom() bool {
+	return wRichScroll.Offset.Y >=
+		wRichScroll.Content.Size().Height-wRichScroll.Size().Height
 }
 
-func bufferToggleUnimportant(name string) {
-	relaySend(RelayCommandData{
-		Variant: &RelayCommandDataBufferToggleUnimportant{BufferName: name},
-	}, nil)
+func bufferScrollToBottom() {
+	// XXX: Doing it once is not reliable, something's amiss.
+	// (In particular, nothing happens when we switch from an empty buffer
+	// to a buffer than needs scrolling.)
+	wRichScroll.ScrollToBottom()
+	wRichScroll.ScrollToBottom()
+	refreshStatus()
 }
 
 func bufferPushLine(b *buffer, line bufferLine) {
@@ -386,68 +388,20 @@ func bufferPushLine(b *buffer, line bufferLine) {
 	}
 }
 
-// --- Current buffer ----------------------------------------------------------
-
-func bufferToggleLogFinish(err string, response *RelayResponseDataBufferLog) {
-	if response == nil {
-		showErrorMessage(err)
-		return
-	}
-
-	wLog.SetText(string(response.Log))
-	wLog.Show()
-	wRichScroll.Hide()
-}
-
-func bufferToggleLog() {
-	if wLog.Visible() {
-		wRichScroll.Show()
-		wLog.Hide()
-		wLog.SetText("")
-		return
-	}
-
-	name := bufferCurrent
-	relaySend(RelayCommandData{Variant: &RelayCommandDataBufferLog{
-		BufferName: name,
-	}}, func(err string, response *RelayResponseData) {
-		if bufferCurrent == name {
-			bufferToggleLogFinish(
-				err, response.Variant.(*RelayResponseDataBufferLog))
-		}
-	})
-}
-
-func bufferAtBottom() bool {
-	return wRichScroll.Offset.Y >=
-		wRichScroll.Content.Size().Height-wRichScroll.Size().Height
-}
-
-func bufferScrollToBottom() {
-	// XXX: Doing it once is not reliable, something's amiss.
-	// (In particular, nothing happens when we switch from an empty buffer
-	// to a buffer than needs scrolling.)
-	wRichScroll.ScrollToBottom()
-	wRichScroll.ScrollToBottom()
-	refreshStatus()
-}
-
 // --- UI state refresh --------------------------------------------------------
 
 func refreshIcon() {
-	highlighted := false
+	resource := resourceIconNormal
 	for _, b := range buffers {
 		if b.highlighted {
-			highlighted = true
+			resource = resourceIconHighlighted
 			break
 		}
 	}
 
-	if highlighted {
-		wWindow.SetIcon(resourceIconHighlighted)
-	} else {
-		wWindow.SetIcon(resourceIconNormal)
-	}
+	// Prevent deadlocks (though it might have a race condition).
+	// https://github.com/fyne-io/fyne/issues/5266
+	go func() { wWindow.SetIcon(resource) }()
 }
 
 func refreshTopic(topic []bufferLineItem) {
@@ -515,6 +469,63 @@ func refreshStatus() {
 	wStatus.SetText(status)
 }
 
+func recheckHighlighted() {
+	// Corresponds to the logic toggling the bool on.
+	if b := bufferByName(bufferCurrent); b != nil &&
+		b.highlighted && bufferAtBottom() &&
+		inForeground && !wLog.Visible() {
+		b.highlighted = false
+		refreshIcon()
+		refreshBufferList()
+	}
+}
+
+// --- Buffer actions ----------------------------------------------------------
+
+func bufferActivate(name string) {
+	relaySend(RelayCommandData{
+		Variant: &RelayCommandDataBufferActivate{BufferName: name},
+	}, nil)
+}
+
+func bufferToggleUnimportant(name string) {
+	relaySend(RelayCommandData{
+		Variant: &RelayCommandDataBufferToggleUnimportant{BufferName: name},
+	}, nil)
+}
+
+func bufferToggleLogFinish(err string, response *RelayResponseDataBufferLog) {
+	if response == nil {
+		showErrorMessage(err)
+		return
+	}
+
+	wLog.SetText(string(response.Log))
+	wLog.Show()
+	wRichScroll.Hide()
+}
+
+func bufferToggleLog() {
+	if wLog.Visible() {
+		wRichScroll.Show()
+		wLog.Hide()
+		wLog.SetText("")
+
+		recheckHighlighted()
+		return
+	}
+
+	name := bufferCurrent
+	relaySend(RelayCommandData{Variant: &RelayCommandDataBufferLog{
+		BufferName: name,
+	}}, func(err string, response *RelayResponseData) {
+		if bufferCurrent == name {
+			bufferToggleLogFinish(
+				err, response.Variant.(*RelayResponseDataBufferLog))
+		}
+	})
+}
+
 // --- RichText formatting -----------------------------------------------------
 
 func defaultBufferLineItem() bufferLineItem { return bufferLineItem{} }
@@ -756,6 +767,7 @@ func refreshBuffer(b *buffer) {
 	bufferPrintAndWatchTrailingDateChanges()
 	wRichText.Refresh()
 	bufferScrollToBottom()
+	recheckHighlighted()
 }
 
 // --- Event processing --------------------------------------------------------
@@ -1374,6 +1386,9 @@ func (l *customLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) {
 	}
 	if toBottom {
 		bufferScrollToBottom()
+	} else {
+		recheckHighlighted()
+		refreshStatus()
 	}
 }
 
@@ -1497,11 +1512,7 @@ func main() {
 	a.Lifecycle().SetOnEnteredForeground(func() {
 		// TODO(p): Does this need locking?
 		inForeground = true
-		if b := bufferByName(bufferCurrent); b != nil {
-			b.highlighted = false
-			refreshIcon()
-			refreshBufferList()
-		}
+		recheckHighlighted()
 	})
 	a.Lifecycle().SetOnExitedForeground(func() {
 		inForeground = false
@@ -1542,7 +1553,10 @@ func main() {
 	wRichText = widget.NewRichText()
 	wRichText.Wrapping = fyne.TextWrapWord
 	wRichScroll = container.NewVScroll(wRichText)
-	wRichScroll.OnScrolled = func(position fyne.Position) { refreshStatus() }
+	wRichScroll.OnScrolled = func(position fyne.Position) {
+		recheckHighlighted()
+		refreshStatus()
+	}
 	wLog = newLogEntry()
 	wLog.Wrapping = fyne.TextWrapWord
 	wLog.Hide()
-- 
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