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/*
* Copyright (C) 2022 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.model;
import static com.android.launcher3.WorkspaceLayoutManager.FIRST_SCREEN_ID;
import android.util.LongSparseArray;
import com.android.launcher3.InvariantDeviceProfile;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherSettings;
import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.model.data.ItemInfo;
import com.android.launcher3.util.GridOccupancy;
import com.android.launcher3.util.IntArray;
import com.android.launcher3.util.IntSet;
import java.util.ArrayList;
/**
* Utility class to help find space for new workspace items
*/
public class WorkspaceItemSpaceFinder {
/**
* Find a position on the screen for the given size or adds a new screen.
*
* @return screenId and the coordinates for the item in an int array of size 3.
*/
public int[] findSpaceForItem(LauncherAppState app, BgDataModel dataModel,
IntArray workspaceScreens, IntArray addedWorkspaceScreensFinal, int spanX, int spanY) {
LongSparseArray<ArrayList<ItemInfo>> screenItems = new LongSparseArray<>();
// Use sBgItemsIdMap as all the items are already loaded.
synchronized (dataModel) {
for (ItemInfo info : dataModel.itemsIdMap) {
if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
ArrayList<ItemInfo> items = screenItems.get(info.screenId);
if (items == null) {
items = new ArrayList<>();
screenItems.put(info.screenId, items);
}
items.add(info);
}
}
}
// Find appropriate space for the item.
int screenId = 0;
int[] coordinates = new int[2];
boolean found = false;
int screenCount = workspaceScreens.size();
// First check the preferred screen.
IntSet screensToExclude = new IntSet();
if (FeatureFlags.QSB_ON_FIRST_SCREEN) {
screensToExclude.add(FIRST_SCREEN_ID);
}
for (int screen = 0; screen < screenCount; screen++) {
screenId = workspaceScreens.get(screen);
if (!screensToExclude.contains(screenId) && findNextAvailableIconSpaceInScreen(
app, screenItems.get(screenId), coordinates, spanX, spanY)) {
// We found a space for it
found = true;
break;
}
}
if (!found) {
// Still no position found. Add a new screen to the end.
screenId = app.getModel().getModelDbController().getNewScreenId();
// Save the screen id for binding in the workspace
workspaceScreens.add(screenId);
addedWorkspaceScreensFinal.add(screenId);
// If we still can't find an empty space, then God help us all!!!
if (!findNextAvailableIconSpaceInScreen(
app, screenItems.get(screenId), coordinates, spanX, spanY)) {
throw new RuntimeException("Can't find space to add the item");
}
}
return new int[]{screenId, coordinates[0], coordinates[1]};
}
private boolean findNextAvailableIconSpaceInScreen(
LauncherAppState app, ArrayList<ItemInfo> occupiedPos,
int[] xy, int spanX, int spanY) {
InvariantDeviceProfile profile = app.getInvariantDeviceProfile();
GridOccupancy occupied = new GridOccupancy(profile.numColumns, profile.numRows);
if (occupiedPos != null) {
for (ItemInfo r : occupiedPos) {
occupied.markCells(r, true);
}
}
return occupied.findVacantCell(xy, spanX, spanY);
}
}
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