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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.util;
/**
* Defines method to find the next vacant cell on a grid.
* This uses the default top-down, left-right approach and can be over-written through
* code swaps in different launchers.
*/
public abstract class AbsGridOccupancy {
/**
* Find the first vacant cell, if there is one.
*
* @param vacantOut Holds the x and y coordinate of the vacant cell
* @param spanX Horizontal cell span.
* @param spanY Vertical cell span.
*
* @return true if a vacant cell was found
*/
protected boolean findVacantCell(int[] vacantOut, boolean[][] cells, int countX, int countY,
int spanX, int spanY) {
for (int y = 0; (y + spanY) <= countY; y++) {
for (int x = 0; (x + spanX) <= countX; x++) {
boolean available = !cells[x][y];
out:
for (int i = x; i < x + spanX; i++) {
for (int j = y; j < y + spanY; j++) {
available = available && !cells[i][j];
if (!available) break out;
}
}
if (available) {
vacantOut[0] = x;
vacantOut[1] = y;
return true;
}
}
}
return false;
}
}
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