meshtastic/Meshtastic-Android
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workaround a kotlin(?!) bug

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// FIXME - possible kotlin bug in 1.3.72 - it seems that if we start with the (globally shared) emptyList,
// then adding items are affecting that shared list rather than a copy.   This was causing aliasing of
// recentDataPackets with messages.value in the GUI.  So if the current list is empty we are careful to make a new list
This commit is contained in:
geeksville 2020-06-04 08:53:37 -07:00
parent ef61c9acff
commit 6a3a763f71
2 changed files with 22 additions and 5 deletions
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11
app/src/main/java/com/geeksville/mesh/model/MessagesState.kt
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@ -23,7 +23,7 @@ class MessagesState(private val ui: UIViewModel) : Logging {
// If the following (unused otherwise) line is commented out, the IDE preview window works.
// if left in the preview always renders as empty.
val messages =
object : MutableLiveData<List<DataPacket>>(if (isEmulator) testTexts else listOf()) {
object : MutableLiveData<List<DataPacket>>(if (isEmulator) testTexts else emptyList()) {
}
@ -31,7 +31,14 @@ class MessagesState(private val ui: UIViewModel) : Logging {
fun addMessage(m: DataPacket) {
debug("Adding message to view id=${m.id}")
// FIXME - don't just slam in a new list each time, it probably causes extra drawing.
messages.value = messages.value!! + m
// FIXME - possible kotlin bug in 1.3.72 - it seems that if we start with the (globally shared) emptyList,
// then adding items are affecting that shared list rather than a copy. This was causing aliasing of
// recentDataPackets with messages.value in the GUI. So if the current list is empty we are careful to make a new list
messages.value = if (messages.value.isNullOrEmpty())
listOf(m)
else
messages.value!! + m
}
fun updateStatus(id: Int, status: MessageStatus) {