Merge "Abstract out the logic to determine text color" into tm-qpr-dev am: e13d22fbcc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19758591

Change-Id: I5d48938e2e2cb05b91c1c6d860b2249a61bfa066
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

packages/SystemUI/shared/src/com/android/systemui/shared/regionsampling/RegionSamplingInstance.kt

@@ -15,6 +15,7 @@
  */
 package com.android.systemui.shared.regionsampling
 
+import android.graphics.Color
 import android.graphics.Rect
 import android.view.View
 import androidx.annotation.VisibleForTesting
@@ -33,18 +34,19 @@ open class RegionSamplingInstance(
         regionSamplingEnabled: Boolean,
         updateFun: UpdateColorCallback
 ) {
-    private var isDark = RegionDarkness.DEFAULT
+    private var regionDarkness = RegionDarkness.DEFAULT
     private var samplingBounds = Rect()
     private val tmpScreenLocation = IntArray(2)
     @VisibleForTesting var regionSampler: RegionSamplingHelper? = null
-
+    private var lightForegroundColor = Color.WHITE
+    private var darkForegroundColor = Color.BLACK
     /**
      * Interface for method to be passed into RegionSamplingHelper
      */
     @FunctionalInterface
     interface UpdateColorCallback {
         /**
-         * Method to update the text colors after clock darkness changed.
+         * Method to update the foreground colors after clock darkness changed.
          */
         fun updateColors()
     }
@@ -59,6 +61,30 @@ open class RegionSamplingInstance(
         return RegionSamplingHelper(sampledView, callback, mainExecutor, bgExecutor)
     }
 
+    /**
+     * Sets the colors to be used for Dark and Light Foreground.
+     *
+     * @param lightColor The color used for Light Foreground.
+     * @param darkColor The color used for Dark Foreground.
+     */
+    fun setForegroundColors(lightColor: Int, darkColor: Int) {
+        lightForegroundColor = lightColor
+        darkForegroundColor = darkColor
+    }
+
+    /**
+     * Determines which foreground color to use based on region darkness.
+     *
+     * @return the determined foreground color
+     */
+    fun currentForegroundColor(): Int{
+        return if (regionDarkness.isDark) {
+            lightForegroundColor
+        } else {
+            darkForegroundColor
+        }
+    }
+
     private fun convertToClockDarkness(isRegionDark: Boolean): RegionDarkness {
         return if (isRegionDark) {
             RegionDarkness.DARK
@@ -68,7 +94,7 @@ open class RegionSamplingInstance(
     }
 
     fun currentRegionDarkness(): RegionDarkness {
-        return isDark
+        return regionDarkness
     }
 
     /**
@@ -97,7 +123,7 @@ open class RegionSamplingInstance(
             regionSampler = createRegionSamplingHelper(sampledView,
                     object : SamplingCallback {
                         override fun onRegionDarknessChanged(isRegionDark: Boolean) {
-                            isDark = convertToClockDarkness(isRegionDark)
+                            regionDarkness = convertToClockDarkness(isRegionDark)
                             updateFun.updateColors()
                         }
                         /**

packages/SystemUI/src/com/android/systemui/statusbar/lockscreen/LockscreenSmartspaceController.kt

@@ -118,6 +118,7 @@ class LockscreenSmartspaceController @Inject constructor(
                     regionSamplingEnabled,
                     updateFun
             )
+            initializeTextColors(regionSamplingInstance)
             regionSamplingInstance.startRegionSampler()
             regionSamplingInstances.put(v, regionSamplingInstance)
             connectSession()
@@ -361,18 +362,20 @@ class LockscreenSmartspaceController @Inject constructor(
         }
     }
 
+    private fun initializeTextColors(regionSamplingInstance: RegionSamplingInstance) {
+        val lightThemeContext = ContextThemeWrapper(context, R.style.Theme_SystemUI_LightWallpaper)
+        val darkColor = Utils.getColorAttrDefaultColor(lightThemeContext, R.attr.wallpaperTextColor)
+
+        val darkThemeContext = ContextThemeWrapper(context, R.style.Theme_SystemUI)
+        val lightColor = Utils.getColorAttrDefaultColor(darkThemeContext, R.attr.wallpaperTextColor)
+
+        regionSamplingInstance.setForegroundColors(lightColor, darkColor)
+    }
+
     private fun updateTextColorFromRegionSampler() {
         smartspaceViews.forEach {
-            val isRegionDark = regionSamplingInstances.getValue(it).currentRegionDarkness()
-            val themeID = if (isRegionDark.isDark) {
-                R.style.Theme_SystemUI
-            } else {
-                R.style.Theme_SystemUI_LightWallpaper
-            }
-            val themedContext = ContextThemeWrapper(context, themeID)
-            val wallpaperTextColor =
-                    Utils.getColorAttrDefaultColor(themedContext, R.attr.wallpaperTextColor)
-            it.setPrimaryTextColor(wallpaperTextColor)
+            val textColor = regionSamplingInstances.getValue(it).currentForegroundColor()
+            it.setPrimaryTextColor(textColor)
         }
     }