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/*
* Copyright (C) 2015 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.accessibility;
import android.text.TextUtils;
import android.view.View;
import com.android.launcher3.AppInfo;
import com.android.launcher3.CellLayout;
import com.android.launcher3.FolderInfo;
import com.android.launcher3.ItemInfo;
import com.android.launcher3.accessibility.LauncherAccessibilityDelegate.DragType;
import com.android.launcher3.R;
import com.android.launcher3.ShortcutInfo;
/**
* Implementation of {@link DragAndDropAccessibilityDelegate} to support DnD on workspace.
*/
public class WorkspaceAccessibilityHelper extends DragAndDropAccessibilityDelegate {
public WorkspaceAccessibilityHelper(CellLayout layout) {
super(layout);
}
/**
* Find the virtual view id corresponding to the top left corner of any drop region by which
* the passed id is contained. For an icon, this is simply
*/
@Override
protected int intersectsValidDropTarget(int id) {
int mCountX = mView.getCountX();
int mCountY = mView.getCountY();
int x = id % mCountX;
int y = id / mCountX;
LauncherAccessibilityDelegate.DragInfo dragInfo = mDelegate.getDragInfo();
if (dragInfo.dragType == DragType.WIDGET && mView.isHotseat()) {
return INVALID_POSITION;
}
if (dragInfo.dragType == DragType.WIDGET) {
// For a widget, every cell must be vacant. In addition, we will return any valid
// drop target by which the passed id is contained.
boolean fits = false;
// These represent the amount that we can back off if we hit a problem. They
// get consumed as we move up and to the right, trying new regions.
int spanX = dragInfo.info.spanX;
int spanY = dragInfo.info.spanY;
for (int m = 0; m < spanX; m++) {
for (int n = 0; n < spanY; n++) {
fits = true;
int x0 = x - m;
int y0 = y - n;
if (x0 < 0 || y0 < 0) continue;
for (int i = x0; i < x0 + spanX; i++) {
if (!fits) break;
for (int j = y0; j < y0 + spanY; j++) {
if (i >= mCountX || j >= mCountY || mView.isOccupied(i, j)) {
fits = false;
break;
}
}
}
if (fits) {
return x0 + mCountX * y0;
}
}
}
return INVALID_POSITION;
} else {
// For an icon, we simply check the view directly below
View child = mView.getChildAt(x, y);
if (child == null || child == dragInfo.item) {
// Empty cell. Good for an icon or folder.
return id;
} else if (dragInfo.dragType != DragType.FOLDER) {
// For icons, we can consider cells that have another icon or a folder.
ItemInfo info = (ItemInfo) child.getTag();
if (info instanceof AppInfo || info instanceof FolderInfo ||
info instanceof ShortcutInfo) {
return id;
}
}
return INVALID_POSITION;
}
}
@Override
protected String getConfirmationForIconDrop(int id) {
int x = id % mView.getCountX();
int y = id / mView.getCountX();
LauncherAccessibilityDelegate.DragInfo dragInfo = mDelegate.getDragInfo();
View child = mView.getChildAt(x, y);
if (child == null || child == dragInfo.item) {
return mContext.getString(R.string.item_moved);
} else {
ItemInfo info = (ItemInfo) child.getTag();
if (info instanceof AppInfo || info instanceof ShortcutInfo) {
return mContext.getString(R.string.folder_created);
} else if (info instanceof FolderInfo) {
return mContext.getString(R.string.added_to_folder);
}
}
return "";
}
@Override
protected String getLocationDescriptionForIconDrop(int id) {
int x = id % mView.getCountX();
int y = id / mView.getCountX();
LauncherAccessibilityDelegate.DragInfo dragInfo = mDelegate.getDragInfo();
View child = mView.getChildAt(x, y);
if (child == null || child == dragInfo.item) {
if (mView.isHotseat()) {
return mContext.getString(R.string.move_to_hotseat_position, id + 1);
} else {
return mContext.getString(R.string.move_to_empty_cell, y + 1, x + 1);
}
} else {
ItemInfo info = (ItemInfo) child.getTag();
if (info instanceof ShortcutInfo) {
return mContext.getString(R.string.create_folder_with, info.title);
} else if (info instanceof FolderInfo) {
if (TextUtils.isEmpty(info.title)) {
// Find the first item in the folder.
FolderInfo folder = (FolderInfo) info;
ShortcutInfo firstItem = null;
for (ShortcutInfo shortcut : folder.contents) {
if (firstItem == null || firstItem.rank > shortcut.rank) {
firstItem = shortcut;
}
}
if (firstItem != null) {
return mContext.getString(R.string.add_to_folder_with_app, firstItem.title);
}
}
return mContext.getString(R.string.add_to_folder, info.title);
}
}
return "";
}
}
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