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/*
* Copyright (C) 2023 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.celllayout;
import android.view.View;
import com.android.launcher3.CellLayout;
import com.android.launcher3.MultipageCellLayout;
import com.android.launcher3.ShortcutAndWidgetContainer;
import com.android.launcher3.util.GridOccupancy;
import java.util.Arrays;
import java.util.function.Supplier;
/**
* Variant of ReorderAlgorithm which simulates a foldable screen and adds a seam in the middle
* to prevent items to be placed in the middle.
*/
public class MulticellReorderAlgorithm extends ReorderAlgorithm {
private final View mSeam;
public MulticellReorderAlgorithm(CellLayout cellLayout) {
super(cellLayout);
mSeam = new View(cellLayout.getContext());
}
public ItemConfiguration removeSeamFromSolution(ItemConfiguration solution) {
solution.map.remove(mSeam);
solution.map.forEach((view, cell) -> cell.cellX =
cell.cellX > mCellLayout.getCountX() / 2 ? cell.cellX - 1 : cell.cellX);
solution.cellX =
solution.cellX > mCellLayout.getCountX() / 2 ? solution.cellX - 1 : solution.cellX;
return solution;
}
@Override
public ItemConfiguration closestEmptySpaceReorder(ReorderParameters reorderParameters) {
return removeSeamFromSolution(simulateSeam(
() -> super.closestEmptySpaceReorder(reorderParameters))
);
}
@Override
public ItemConfiguration findReorderSolution(ReorderParameters reorderParameters,
boolean decX) {
return removeSeamFromSolution(simulateSeam(
() -> super.findReorderSolution(reorderParameters, decX)));
}
@Override
public ItemConfiguration dropInPlaceSolution(ReorderParameters reorderParameters) {
return removeSeamFromSolution(
simulateSeam(() -> super.dropInPlaceSolution(reorderParameters))
);
}
void addSeam() {
MultipageCellLayout mcl = (MultipageCellLayout) mCellLayout;
mcl.setSeamWasAdded(true);
CellLayoutLayoutParams lp = new CellLayoutLayoutParams(mcl.getCountX() / 2, 0, 1,
mcl.getCountY());
lp.canReorder = false;
mcl.setCountX(mcl.getCountX() + 1);
mcl.getShortcutsAndWidgets().addViewInLayout(mSeam, lp);
mcl.setOccupied(createGridOccupancyWithSeam());
mcl.mTmpOccupied = new GridOccupancy(mcl.getCountX(), mcl.getCountY());
}
void removeSeam() {
MultipageCellLayout mcl = (MultipageCellLayout) mCellLayout;
mcl.setCountX(mcl.getCountX() - 1);
mcl.getShortcutsAndWidgets().removeViewInLayout(mSeam);
mcl.mTmpOccupied = new GridOccupancy(mcl.getCountX(), mcl.getCountY());
mcl.setSeamWasAdded(false);
}
/**
* The function supplied here will execute while the CellLayout has a simulated seam added.
*
* @param f function to run under simulation
* @param <T> return value of the supplied function
* @return Value of supplied function
*/
public <T> T simulateSeam(Supplier<T> f) {
MultipageCellLayout mcl = (MultipageCellLayout) mCellLayout;
if (mcl.isSeamWasAdded()) {
return f.get();
}
GridOccupancy auxGrid = mcl.getOccupied();
addSeam();
T res = f.get();
removeSeam();
mcl.setOccupied(auxGrid);
return res;
}
GridOccupancy createGridOccupancyWithSeam() {
ShortcutAndWidgetContainer shortcutAndWidgets = mCellLayout.getShortcutsAndWidgets();
GridOccupancy grid = new GridOccupancy(mCellLayout.getCountX(), mCellLayout.getCountY());
for (int i = 0; i < shortcutAndWidgets.getChildCount(); i++) {
View view = shortcutAndWidgets.getChildAt(i);
CellLayoutLayoutParams lp = (CellLayoutLayoutParams) view.getLayoutParams();
int seamOffset = lp.getCellX() >= mCellLayout.getCountX() / 2 && lp.canReorder ? 1 : 0;
grid.markCells(lp.getCellX() + seamOffset, lp.getCellY(), lp.cellHSpan, lp.cellVSpan,
true);
}
Arrays.fill(grid.cells[mCellLayout.getCountX() / 2], true);
return grid;
}
}
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