lawnchair/src/com/android/launcher3/util/WindowManagerCompat.java

/*
 * 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.launcher3.util;

import static com.android.launcher3.ResourceUtils.INVALID_RESOURCE_HANDLE;
import static com.android.launcher3.Utilities.dpiFromPx;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Insets;
import android.graphics.Rect;
import android.os.Build;
import android.util.ArraySet;
import android.view.WindowInsets;
import android.view.WindowInsets.Type;
import android.view.WindowManager;
import android.view.WindowMetrics;

import com.android.launcher3.R;
import com.android.launcher3.ResourceUtils;
import com.android.launcher3.Utilities;
import com.android.launcher3.util.DisplayController.PortraitSize;

import java.util.Collections;
import java.util.Set;

/**
 * Utility class to estimate window manager values
 */
@TargetApi(Build.VERSION_CODES.S)
public class WindowManagerCompat {

    public static final int MIN_TABLET_WIDTH = 600;

    /**
     * Returns a set of supported render sizes for a internal display.
     * This is a temporary workaround which assumes only nav-bar insets change across displays, and
     * is only used until we eventually get the real values
     * @param consumeTaskBar if true, it assumes that task bar is part of the app window
     *                       and ignores any insets because of task bar.
     */
    public static Set<WindowBounds> estimateDisplayProfiles(
            Context windowContext, PortraitSize size, int densityDpi, boolean consumeTaskBar) {
        if (!Utilities.ATLEAST_S) {
            return Collections.emptySet();
        }
        WindowInsets defaultInsets = windowContext.getSystemService(WindowManager.class)
                .getMaximumWindowMetrics().getWindowInsets();
        boolean isGesturalMode = ResourceUtils.getIntegerByName(
                "config_navBarInteractionMode",
                windowContext.getResources(),
                INVALID_RESOURCE_HANDLE) == 2;

        WindowInsets.Builder insetsBuilder = new WindowInsets.Builder(defaultInsets);
        Set<WindowBounds> result = new ArraySet<>();
        int swDP = (int) dpiFromPx(size.width, densityDpi);
        boolean isTablet = swDP >= MIN_TABLET_WIDTH;

        final Insets portraitNav, landscapeNav;
        if (isTablet && !consumeTaskBar) {
            portraitNav = landscapeNav = Insets.of(0, 0, 0, windowContext.getResources()
                    .getDimensionPixelSize(R.dimen.taskbar_size));
        } else if (!isGesturalMode) {
            portraitNav = Insets.of(0, 0, 0,
                    getSystemResource(windowContext, "navigation_bar_height", swDP));
            landscapeNav = isTablet
                    ? Insets.of(0, 0, 0, getSystemResource(windowContext,
                            "navigation_bar_height_landscape", swDP))
                    : Insets.of(0, 0, getSystemResource(windowContext,
                            "navigation_bar_width", swDP), 0);
        } else {
            portraitNav = landscapeNav = Insets.of(0, 0, 0, 0);
        }

        result.add(WindowBounds.fromWindowMetrics(new WindowMetrics(
                new Rect(0, 0, size.width, size.height),
                insetsBuilder.setInsets(Type.navigationBars(), portraitNav).build())));
        result.add(WindowBounds.fromWindowMetrics(new WindowMetrics(
                new Rect(0, 0, size.height, size.width),
                insetsBuilder.setInsets(Type.navigationBars(), landscapeNav).build())));
        return result;
    }

    private static int getSystemResource(Context context, String key, int swDp) {
        int resourceId = context.getResources().getIdentifier(key, "dimen", "android");
        if (resourceId > 0) {
            Configuration conf = new Configuration();
            conf.smallestScreenWidthDp = swDp;
            return context.createConfigurationContext(conf)
                    .getResources().getDimensionPixelSize(resourceId);
        }
        return 0;
    }
}