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/*
* 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 android.window;
import static android.view.Display.INVALID_DISPLAY;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.ResourcesManager;
import android.app.WindowConfiguration;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.IBinder;
import android.view.Display;
import android.view.WindowManager;
/**
* A helper class to maintain {@link android.content.res.Configuration} related methods used both
* in {@link android.app.Activity} and {@link WindowContext}.
*
* @hide
*/
public class ConfigurationHelper {
private ConfigurationHelper() {}
/** Ask text layout engine to free its caches if there is a locale change. */
public static void freeTextLayoutCachesIfNeeded(int configDiff) {
if ((configDiff & ActivityInfo.CONFIG_LOCALE) != 0) {
Canvas.freeTextLayoutCaches();
}
}
/**
* Returns {@code true} if the {@link android.content.res.Resources} associated with
* a {@code token} needs to be updated.
*
* @param token A {@link Context#getActivityToken() activity token} or
* {@link Context#getWindowContextToken() window context token}
* @param config The original {@link Configuration}
* @param newConfig The updated Configuration
* @param displayChanged a flag to indicate there's a display change
* @param configChanged a flag to indicate there's a Configuration change.
*
* @see ResourcesManager#updateResourcesForActivity(IBinder, Configuration, int)
*/
public static boolean shouldUpdateResources(IBinder token, @Nullable Configuration config,
@NonNull Configuration newConfig, @NonNull Configuration overrideConfig,
boolean displayChanged, @Nullable Boolean configChanged) {
// The configuration has not yet been initialized. We should update it.
if (config == null) {
return true;
}
// If the token associated context is moved to another display, we should update the
// ResourcesKey.
if (displayChanged) {
return true;
}
// If the new config is the same as the config this Activity is already running with and
// the override config also didn't change, then don't update the Resources
if (!ResourcesManager.getInstance().isSameResourcesOverrideConfig(token, overrideConfig)) {
return true;
}
// If there's a update on WindowConfiguration#mBounds or maxBounds, we should update the
// Resources to make WindowMetrics API report the updated result.
if (shouldUpdateWindowMetricsBounds(config, newConfig)) {
return true;
}
// If the display rotation has changed, we also need to update resources.
if (isDisplayRotationChanged(config, newConfig)) {
return true;
}
return configChanged == null ? config.diff(newConfig) != 0 : configChanged;
}
/**
* Returns {@code true} if {@code displayId} is different from {@code newDisplayId}.
* Note that {@link Display#INVALID_DISPLAY} means no difference.
*/
public static boolean isDifferentDisplay(int displayId, int newDisplayId) {
return newDisplayId != INVALID_DISPLAY && displayId != newDisplayId;
}
// TODO(b/173090263): Remove this method after the improvement of AssetManager and ResourcesImpl
// constructions.
/**
* Returns {@code true} if the metrics reported by {@link android.view.WindowMetrics} APIs
* should be updated.
*
* @see WindowManager#getCurrentWindowMetrics()
* @see WindowManager#getMaximumWindowMetrics()
*/
private static boolean shouldUpdateWindowMetricsBounds(@NonNull Configuration currentConfig,
@NonNull Configuration newConfig) {
final Rect currentBounds = currentConfig.windowConfiguration.getBounds();
final Rect newBounds = newConfig.windowConfiguration.getBounds();
final Rect currentMaxBounds = currentConfig.windowConfiguration.getMaxBounds();
final Rect newMaxBounds = newConfig.windowConfiguration.getMaxBounds();
return !currentBounds.equals(newBounds) || !currentMaxBounds.equals(newMaxBounds);
}
private static boolean isDisplayRotationChanged(@NonNull Configuration config,
@NonNull Configuration newConfig) {
final int origRot = config.windowConfiguration.getDisplayRotation();
final int newRot = newConfig.windowConfiguration.getDisplayRotation();
if (newRot == WindowConfiguration.ROTATION_UNDEFINED
|| origRot == WindowConfiguration.ROTATION_UNDEFINED) {
return false;
}
return origRot != newRot;
}
}
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