Andras Kloczl
55edfe55f7
There's a logic which prioritizes the binding for the current page and defers the other pages' binding. If two panel home is enabled, we want to bind both pages together. LauncherPageRestoreHelper has been created to contain the logic for persisting restoring and calculating which pages to load immediately. Test: manual + run LauncherPageRestoreHelperTest robo test Bug: 174464691 Change-Id: I57ac3f7150303b95b272e922f44bda26f9d5ce2a
93 lines
3.4 KiB
Java
93 lines
3.4 KiB
Java
/**
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3;
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import android.os.Bundle;
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import android.util.Log;
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import androidx.annotation.VisibleForTesting;
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import com.android.launcher3.util.IntSet;
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import static androidx.annotation.VisibleForTesting.PACKAGE_PRIVATE;
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/**
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* There's a logic which prioritizes the binding for the current page and defers the other pages'
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* binding. If two panel home is enabled, we want to bind both pages together.
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* LauncherPageRestoreHelper's purpose is to contain the logic for persisting, restoring and
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* calculating which pages to load immediately.
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*/
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public class LauncherPageRestoreHelper {
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public static final String TAG = "LauncherPageRestoreHelper";
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// Type: int
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private static final String RUNTIME_STATE_CURRENT_SCREEN = "launcher.current_screen";
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// Type: int
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private static final String RUNTIME_STATE_CURRENT_SCREEN_COUNT =
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"launcher.current_screen_count";
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private Workspace mWorkspace;
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public LauncherPageRestoreHelper(Workspace workspace) {
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this.mWorkspace = workspace;
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}
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/**
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* Some configuration changes trigger Launcher to recreate itself, and we want to give more
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* priority to the currently active pages in the restoration process.
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*/
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@VisibleForTesting(otherwise = PACKAGE_PRIVATE)
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public IntSet getPagesToRestore(Bundle savedInstanceState) {
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IntSet pagesToRestore = new IntSet();
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if (savedInstanceState == null) {
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return pagesToRestore;
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}
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int currentPage = savedInstanceState.getInt(RUNTIME_STATE_CURRENT_SCREEN, -1);
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int totalPageCount = savedInstanceState.getInt(RUNTIME_STATE_CURRENT_SCREEN_COUNT, -1);
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int panelCount = mWorkspace.getPanelCount();
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if (totalPageCount <= 0 || currentPage < 0) {
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Log.e(TAG, "getPagesToRestore: Invalid input: " + totalPageCount + ", " + currentPage);
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return pagesToRestore;
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}
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int newCurrentPage = mWorkspace.getLeftmostVisiblePageForIndex(currentPage);
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for (int page = newCurrentPage; page < newCurrentPage + panelCount
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&& page < totalPageCount; page++) {
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pagesToRestore.add(page);
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}
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return pagesToRestore;
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}
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/**
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* This should be called from Launcher's onSaveInstanceState method to persist everything that
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* is necessary to calculate later which pages need to be initialized first after a
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* configuration change.
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*/
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@VisibleForTesting(otherwise = PACKAGE_PRIVATE)
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public void savePagesToRestore(Bundle outState) {
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int pageCount = mWorkspace.getChildCount();
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if (pageCount > 0) {
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outState.putInt(RUNTIME_STATE_CURRENT_SCREEN, mWorkspace.getCurrentPage());
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outState.putInt(RUNTIME_STATE_CURRENT_SCREEN_COUNT, pageCount);
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}
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}
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}
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