Add the preference controller to control accessibility button preview preference

* Create FloatingMenuLayerDrawable class to handle the preview layer drawable cherry picked from commit 603014760f Bug: 173940869 Test: atest AccessibilityButtonPreviewPreferenceControllerTest FloatingMenuLayerDrawableTest Change-Id: Ia3d030547b377e87c505b2310f559f7f3876ecd5 Merged-In: Ia3d030547b377e87c505b2310f559f7f3876ecd5
2021-02-18 04:01:01 +08:00
parent c72fe39597
commit eb2411db9d
11 changed files with 693 additions and 0 deletions
--- a/src/com/android/settings/accessibility/AccessibilityButtonPreviewPreferenceController.java
+++ b/src/com/android/settings/accessibility/AccessibilityButtonPreviewPreferenceController.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2021 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.accessibility;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.graphics.drawable.Drawable;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.Settings;
+import android.widget.ImageView;
+
+import androidx.annotation.VisibleForTesting;
+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.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+import com.android.settingslib.widget.LayoutPreference;
+
+/** Preference controller that controls the preview effect in accessibility button page. */
+public class AccessibilityButtonPreviewPreferenceController extends BasePreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
+
+    private static final int SMALL_SIZE = 0;
+    private static final float DEFAULT_OPACITY = 0.55f;
+    private static final int DEFAULT_SIZE = 0;
+
+    private final ContentResolver mContentResolver;
+    @VisibleForTesting
+    final ContentObserver mContentObserver;
+    private FloatingMenuLayerDrawable mFloatingMenuPreviewDrawable;
+
+    @VisibleForTesting
+    ImageView mPreview;
+
+    public AccessibilityButtonPreviewPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mContentResolver = context.getContentResolver();
+        mContentObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
+            @Override
+            public void onChange(boolean selfChange) {
+                updatePreviewPreference();
+            }
+        };
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final LayoutPreference preference = screen.findPreference(getPreferenceKey());
+        mPreview = preference.findViewById(R.id.preview_image);
+
+        updatePreviewPreference();
+    }
+
+    @Override
+    public void onResume() {
+        mContentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_BUTTON_MODE),
+                /* notifyForDescendants= */ false, mContentObserver);
+        mContentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_FLOATING_MENU_SIZE),
+                /* notifyForDescendants= */ false, mContentObserver);
+        mContentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_FLOATING_MENU_OPACITY),
+                /* notifyForDescendants= */ false, mContentObserver);
+    }
+
+    @Override
+    public void onPause() {
+        mContentResolver.unregisterContentObserver(mContentObserver);
+    }
+
+    private void updatePreviewPreference() {
+        if (AccessibilityUtil.isFloatingMenuEnabled(mContext)) {
+            final int size = Settings.Secure.getInt(mContentResolver,
+                    Settings.Secure.ACCESSIBILITY_FLOATING_MENU_SIZE, DEFAULT_SIZE);
+            final int opacity = (int) (Settings.Secure.getFloat(mContentResolver,
+                    Settings.Secure.ACCESSIBILITY_FLOATING_MENU_OPACITY, DEFAULT_OPACITY) * 100);
+            final int floatingMenuIconId = (size == SMALL_SIZE)
+                    ? R.drawable.accessibility_button_preview_small_floating_menu
+                    : R.drawable.accessibility_button_preview_large_floating_menu;
+
+            mPreview.setImageDrawable(getFloatingMenuPreviewDrawable(floatingMenuIconId, opacity));
+            // Only change opacity(alpha) would not invoke redraw view, need to invalidate manually.
+            mPreview.invalidate();
+        } else {
+            mPreview.setImageDrawable(
+                    mContext.getDrawable(R.drawable.accessibility_button_navigation));
+        }
+    }
+
+    private Drawable getFloatingMenuPreviewDrawable(int resId, int opacity) {
+        if (mFloatingMenuPreviewDrawable == null) {
+            mFloatingMenuPreviewDrawable = FloatingMenuLayerDrawable.createLayerDrawable(
+                    mContext, resId, opacity);
+        } else {
+            mFloatingMenuPreviewDrawable.updateLayerDrawable(mContext, resId, opacity);
+        }
+
+        return mFloatingMenuPreviewDrawable;
+    }
+}