[TP] Smooth scroll to clock color option position

We should smooth scroll to clock color option position to make sure the
selected option is shown on the screen.

Test: manually tested that the selected color option shows on the screen
Bug: 270097085
Change-Id: Ie6cb75cac2c07f72d0ae1937a9bf932be1dd2de7

2 files changed, 16 insertions, 0 deletions

diff --git a/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt b/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
index b63fd276..2ceb266e 100644
--- a/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
+++ b/src/com/android/customization/picker/clock/ui/binder/ClockSettingsBinder.kt
@@ -132,6 +132,18 @@ object ClockSettingsBinder {
                 }
 
                 launch {
+                    viewModel.selectedColorOptionPosition.collect { selectedPosition ->
+                        if (selectedPosition != -1) {
+                            // We use "post" because we need to give the adapter item a pass to
+                            // update the view.
+                            colorOptionContainerView.post {
+                                colorOptionContainerView.smoothScrollToPosition(selectedPosition)
+                            }
+                        }
+                    }
+                }
+
+                launch {
                     viewModel.selectedClockSize.collect { size ->
                         when (size) {
                             ClockSize.DYNAMIC -> {
diff --git a/src/com/android/customization/picker/clock/ui/viewmodel/ClockSettingsViewModel.kt b/src/com/android/customization/picker/clock/ui/viewmodel/ClockSettingsViewModel.kt
index c9be43f2..23fbc7e4 100644
--- a/src/com/android/customization/picker/clock/ui/viewmodel/ClockSettingsViewModel.kt
+++ b/src/com/android/customization/picker/clock/ui/viewmodel/ClockSettingsViewModel.kt
@@ -181,6 +181,10 @@ private constructor(
                 initialValue = emptyList(),
             )
 
+    @OptIn(ExperimentalCoroutinesApi::class)
+    val selectedColorOptionPosition: Flow<Int> =
+        colorOptions.mapLatest { it.indexOfFirst { colorOption -> colorOption.isSelected } }
+
     private fun ColorSeedOption.toColorOptionViewModel(
         context: Context,
         selectedColorId: String?,