[Contrast] Migrate contrast settings into Display

Test: local raven device
Bug: 333905689

Change-Id: Ie94633c23ebe024b8fb48d7ffebdd7b1dfa588da

src/com/android/settings/display/ContrastSelectorPreferenceController.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.display;
+
+import static android.app.UiModeManager.ContrastUtils.CONTRAST_LEVEL_HIGH;
+import static android.app.UiModeManager.ContrastUtils.CONTRAST_LEVEL_MEDIUM;
+import static android.app.UiModeManager.ContrastUtils.CONTRAST_LEVEL_STANDARD;
+import static android.app.UiModeManager.ContrastUtils.fromContrastLevel;
+import static android.app.UiModeManager.ContrastUtils.toContrastLevel;
+
+import android.app.UiModeManager;
+import android.content.Context;
+import android.provider.Settings;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+import com.android.settingslib.widget.LayoutPreference;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.Executor;
+
+/**
+ * Controller for contrast selector.
+ */
+public class ContrastSelectorPreferenceController extends BasePreferenceController
+        implements LifecycleObserver, OnStart, OnStop, UiModeManager.ContrastChangeListener {
+
+    private static final String KEY_COLOR_CONTRAST_SELECTOR = "color_contrast_selector";
+
+    private final Executor mMainExecutor;
+    private final UiModeManager mUiModeManager;
+    private Map<Integer, LinearLayout> mContrastButtons = new HashMap<>();
+
+    public ContrastSelectorPreferenceController(@NonNull Context context,
+            @NonNull String preferenceKey) {
+        super(context, preferenceKey);
+
+        mMainExecutor = mContext.getMainExecutor();
+        mUiModeManager = mContext.getSystemService(UiModeManager.class);
+    }
+
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        final LayoutPreference mLayoutPreference =
+                screen.findPreference(KEY_COLOR_CONTRAST_SELECTOR);
+
+        mContrastButtons = Map.ofEntries(
+                Map.entry(CONTRAST_LEVEL_STANDARD,
+                        mLayoutPreference.findViewById(R.id.contrast_button_default)),
+                Map.entry(CONTRAST_LEVEL_MEDIUM,
+                        mLayoutPreference.findViewById(R.id.contrast_button_medium)),
+                Map.entry(CONTRAST_LEVEL_HIGH,
+                        mLayoutPreference.findViewById(R.id.contrast_button_high))
+        );
+
+        mContrastButtons.forEach((contrastLevel, contrastButton) -> {
+            contrastButton.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(@Nullable View v) {
+                    Settings.Secure.putFloat(mContext.getContentResolver(),
+                            Settings.Secure.CONTRAST_LEVEL,
+                            fromContrastLevel(contrastLevel));
+                }
+            });
+        });
+
+        highlightContrast(toContrastLevel(mUiModeManager.getContrast()));
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        // The main preferences screen is feature guarded, so this always returns AVAILABLE.
+        return AVAILABLE;
+    }
+
+    @Override
+    public void onStart() {
+        mUiModeManager.addContrastChangeListener(mMainExecutor, this);
+    }
+
+    @Override
+    public void onStop() {
+        mUiModeManager.removeContrastChangeListener(this);
+    }
+
+    @Override
+    public void onContrastChanged(float contrast) {
+        highlightContrast(toContrastLevel(contrast));
+    }
+
+    private void highlightContrast(int contrast) {
+        mContrastButtons.forEach((level, button) -> {
+            button.setSelected(level == contrast);
+        });
+    }
+}