/*
* Copyright (C) 2008 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.launcher;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.ContextMenu;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import java.util.ArrayList;
public class CellLayout extends ViewGroup {
private boolean mPortrait;
private int mCellWidth;
private int mCellHeight;
private int mLongAxisStartPadding;
private int mLongAxisEndPadding;
private int mShortAxisStartPadding;
private int mShortAxisEndPadding;
private int mShortAxisCells;
private int mLongAxisCells;
private int mWidthGap;
private int mHeightGap;
private final Rect mRect = new Rect();
private final CellInfo mCellInfo = new CellInfo();
int[] mCellXY = new int[2];
boolean[][] mOccupied;
private RectF mDragRect = new RectF();
private boolean mDirtyTag;
public CellLayout(Context context) {
this(context, null);
}
public CellLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CellLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CellLayout, defStyle, 0);
mCellWidth = a.getDimensionPixelSize(R.styleable.CellLayout_cellWidth, 10);
mCellHeight = a.getDimensionPixelSize(R.styleable.CellLayout_cellHeight, 10);
mLongAxisStartPadding =
a.getDimensionPixelSize(R.styleable.CellLayout_longAxisStartPadding, 10);
mLongAxisEndPadding =
a.getDimensionPixelSize(R.styleable.CellLayout_longAxisEndPadding, 10);
mShortAxisStartPadding =
a.getDimensionPixelSize(R.styleable.CellLayout_shortAxisStartPadding, 10);
mShortAxisEndPadding =
a.getDimensionPixelSize(R.styleable.CellLayout_shortAxisEndPadding, 10);
mShortAxisCells = a.getInt(R.styleable.CellLayout_shortAxisCells, 4);
mLongAxisCells = a.getInt(R.styleable.CellLayout_longAxisCells, 4);
a.recycle();
setAlwaysDrawnWithCacheEnabled(false);
if (mOccupied == null) {
if (mPortrait) {
mOccupied = new boolean[mShortAxisCells][mLongAxisCells];
} else {
mOccupied = new boolean[mLongAxisCells][mShortAxisCells];
}
}
}
int getCountX() {
return mPortrait ? mShortAxisCells : mLongAxisCells;
}
int getCountY() {
return mPortrait ? mLongAxisCells : mShortAxisCells;
}
@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
// Generate an id for each view, this assumes we have at most 256x256 cells
// per workspace screen
final LayoutParams cellParams = (LayoutParams) params;
child.setId(((getId() & 0xFF) << 16) |
(cellParams.cellX & 0xFF) << 8 | (cellParams.cellY & 0xFF));
super.addView(child, index, params);
}
@Override
public void requestChildFocus(View child, View focused) {
super.requestChildFocus(child, focused);
if (child != null) {
Rect r = new Rect();
child.getDrawingRect(r);
requestRectangleOnScreen(r);
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mCellInfo.screen = ((ViewGroup) getParent()).indexOfChild(this);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
final CellInfo cellInfo = mCellInfo;
if (action == MotionEvent.ACTION_DOWN) {
final Rect frame = mRect;
final int x = (int) ev.getX() + mScrollX;
final int y = (int) ev.getY() + mScrollY;
final int count = getChildCount();
boolean found = false;
for (int i = count - 1; i >= 0; i--) {
final View child = getChildAt(i);
if ((child.getVisibility()) == VISIBLE || child.getAnimation() != null) {
child.getHitRect(frame);
if (frame.contains(x, y)) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
cellInfo.cell = child;
cellInfo.cellX = lp.cellX;
cellInfo.cellY = lp.cellY;
cellInfo.spanX = lp.cellHSpan;
cellInfo.spanY = lp.cellVSpan;
cellInfo.valid = true;
found = true;
mDirtyTag = false;
break;
}
}
}
if (!found) {
int cellXY[] = mCellXY;
pointToCellExact(x, y, cellXY);
final boolean portrait = mPortrait;
final int xCount = portrait ? mShortAxisCells : mLongAxisCells;
final int yCount = portrait ? mLongAxisCells : mShortAxisCells;
final boolean[][] occupied = mOccupied;
findOccupiedCells(xCount, yCount, occupied);
cellInfo.cell = null;
cellInfo.cellX = cellXY[0];
cellInfo.cellY = cellXY[1];
cellInfo.spanX = 1;
cellInfo.spanY = 1;
cellInfo.valid = cellXY[0] >= 0 && cellXY[1] >= 0 && cellXY[0] < xCount &&
cellXY[1] < yCount && !occupied[cellXY[0]][cellXY[1]];
// Instead of finding the interesting vacant cells here, wait until a
// caller invokes getTag() to retrieve the result. Finding the vacant
// cells is a bit expensive and can generate many new objects, it's
// therefore better to defer it until we know we actually need it.
mDirtyTag = true;
}
setTag(cellInfo);
} else if (action == MotionEvent.ACTION_UP) {
cellInfo.cell = null;
cellInfo.cellX = -1;
cellInfo.cellY = -1;
cellInfo.spanX = 0;
cellInfo.spanY = 0;
cellInfo.valid = false;
mDirtyTag = false;
setTag(cellInfo);
}
return false;
}
@Override
public CellInfo getTag() {
final CellInfo info = (CellInfo) super.getTag();
if (mDirtyTag && info.valid) {
final boolean portrait = mPortrait;
final int xCount = portrait ? mShortAxisCells : mLongAxisCells;
final int yCount = portrait ? mLongAxisCells : mShortAxisCells;
final boolean[][] occupied = mOccupied;
findOccupiedCells(xCount, yCount, occupied);
findIntersectingVacantCells(info, info.cellX, info.cellY, xCount, yCount, occupied);
mDirtyTag = false;
}
return info;
}
private static void findIntersectingVacantCells(CellInfo cellInfo, int x, int y,
int xCount, int yCount, boolean[][] occupied) {
cellInfo.maxVacantSpanX = Integer.MIN_VALUE;
cellInfo.maxVacantSpanXSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanYSpanX = Integer.MIN_VALUE;
cellInfo.clearVacantCells();
if (occupied[x][y]) {
return;
}
cellInfo.current.set(x, y, x, y);
findVacantCell(cellInfo.current, xCount, yCount, occupied, cellInfo);
}
private static void findVacantCell(Rect current, int xCount, int yCount, boolean[][] occupied,
CellInfo cellInfo) {
addVacantCell(current, cellInfo);
if (current.left > 0) {
if (isColumnEmpty(current.left - 1, current.top, current.bottom, occupied)) {
current.left--;
findVacantCell(current, xCount, yCount, occupied, cellInfo);
current.left++;
}
}
if (current.right < xCount - 1) {
if (isColumnEmpty(current.right + 1, current.top, current.bottom, occupied)) {
current.right++;
findVacantCell(current, xCount, yCount, occupied, cellInfo);
current.right--;
}
}
if (current.top > 0) {
if (isRowEmpty(current.top - 1, current.left, current.right, occupied)) {
current.top--;
findVacantCell(current, xCount, yCount, occupied, cellInfo);
current.top++;
}
}
if (current.bottom < yCount - 1) {
if (isRowEmpty(current.bottom + 1, current.left, current.right, occupied)) {
current.bottom++;
findVacantCell(current, xCount, yCount, occupied, cellInfo);
current.bottom--;
}
}
}
private static void addVacantCell(Rect current, CellInfo cellInfo) {
CellInfo.VacantCell cell = CellInfo.VacantCell.acquire();
cell.cellX = current.left;
cell.cellY = current.top;
cell.spanX = current.right - current.left + 1;
cell.spanY = current.bottom - current.top + 1;
if (cell.spanX > cellInfo.maxVacantSpanX) {
cellInfo.maxVacantSpanX = cell.spanX;
cellInfo.maxVacantSpanXSpanY = cell.spanY;
}
if (cell.spanY > cellInfo.maxVacantSpanY) {
cellInfo.maxVacantSpanY = cell.spanY;
cellInfo.maxVacantSpanYSpanX = cell.spanX;
}
cellInfo.vacantCells.add(cell);
}
private static boolean isColumnEmpty(int x, int top, int bottom, boolean[][] occupied) {
for (int y = top; y <= bottom; y++) {
if (occupied[x][y]) {
return false;
}
}
return true;
}
private static boolean isRowEmpty(int y, int left, int right, boolean[][] occupied) {
for (int x = left; x <= right; x++) {
if (occupied[x][y]) {
return false;
}
}
return true;
}
CellInfo findAllVacantCells(boolean[] occupiedCells) {
final boolean portrait = mPortrait;
final int xCount = portrait ? mShortAxisCells : mLongAxisCells;
final int yCount = portrait ? mLongAxisCells : mShortAxisCells;
boolean[][] occupied = mOccupied;
if (occupiedCells != null) {
for (int y = 0; y < yCount; y++) {
for (int x = 0; x < xCount; x++) {
occupied[x][y] = occupiedCells[y * xCount + x];
}
}
} else {
findOccupiedCells(xCount, yCount, occupied);
}
CellInfo cellInfo = new CellInfo();
cellInfo.cellX = -1;
cellInfo.cellY = -1;
cellInfo.spanY = 0;
cellInfo.spanX = 0;
cellInfo.maxVacantSpanX = Integer.MIN_VALUE;
cellInfo.maxVacantSpanXSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanYSpanX = Integer.MIN_VALUE;
cellInfo.screen = mCellInfo.screen;
Rect current = cellInfo.current;
for (int x = 0; x < xCount; x++) {
for (int y = 0; y < yCount; y++) {
if (!occupied[x][y]) {
current.set(x, y, x, y);
findVacantCell(current, xCount, yCount, occupied, cellInfo);
occupied[x][y] = true;
}
}
}
cellInfo.valid = cellInfo.vacantCells.size() > 0;
// Assume the caller will perform their own cell searching, otherwise we
// risk causing an unnecessary rebuild after findCellForSpan()
return cellInfo;
}
/**
* Given a point, return the cell that strictly encloses that point
* @param x X coordinate of the point
* @param y Y coordinate of the point
* @param result Array of 2 ints to hold the x and y coordinate of the cell
*/
void pointToCellExact(int x, int y, int[] result) {
final boolean portrait = mPortrait;
final int hStartPadding = portrait ? mShortAxisStartPadding : mLongAxisStartPadding;
final int vStartPadding = portrait ? mLongAxisStartPadding : mShortAxisStartPadding;
result[0] = (x - hStartPadding) / (mCellWidth + mWidthGap);
result[1] = (y - vStartPadding) / (mCellHeight + mHeightGap);
final int xAxis = portrait ? mShortAxisCells : mLongAxisCells;
final int yAxis = portrait ? mLongAxisCells : mShortAxisCells;
if (result[0] < 0) result[0] = 0;
if (result[0] >= xAxis) result[0] = xAxis - 1;
if (result[1] < 0) result[1] = 0;
if (result[1] >= yAxis) result[1] = yAxis - 1;
}
/**
* Given a point, return the cell that most closely encloses that point
* @param x X coordinate of the point
* @param y Y coordinate of the point
* @param result Array of 2 ints to hold the x and y coordinate of the cell
*/
void pointToCellRounded(int x, int y, int[] result) {
pointToCellExact(x + (mCellWidth / 2), y + (mCellHeight / 2), result);
}
/**
* Given a cell coordinate, return the point that represents the upper left corner of that cell
*
* @param cellX X coordinate of the cell
* @param cellY Y coordinate of the cell
*
* @param result Array of 2 ints to hold the x and y coordinate of the point
*/
void cellToPoint(int cellX, int cellY, int[] result) {
final boolean portrait = mPortrait;
final int hStartPadding = portrait ? mShortAxisStartPadding : mLongAxisStartPadding;
final int vStartPadding = portrait ? mLongAxisStartPadding : mShortAxisStartPadding;
result[0] = hStartPadding + cellX * (mCellWidth + mWidthGap);
result[1] = vStartPadding + cellY * (mCellHeight + mHeightGap);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO: currently ignoring padding
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) {
throw new RuntimeException("CellLayout cannot have UNSPECIFIED dimensions");
}
final int shortAxisCells = mShortAxisCells;
final int longAxisCells = mLongAxisCells;
final int longAxisStartPadding = mLongAxisStartPadding;
final int longAxisEndPadding = mLongAxisEndPadding;
final int shortAxisStartPadding = mShortAxisStartPadding;
final int shortAxisEndPadding = mShortAxisEndPadding;
final int cellWidth = mCellWidth;
final int cellHeight = mCellHeight;
mPortrait = heightSpecSize > widthSpecSize;
int numShortGaps = shortAxisCells - 1;
int numLongGaps = longAxisCells - 1;
if (mPortrait) {
int vSpaceLeft = heightSpecSize - longAxisStartPadding - longAxisEndPadding
- (cellHeight * longAxisCells);
mHeightGap = vSpaceLeft / numLongGaps;
int hSpaceLeft = widthSpecSize - shortAxisStartPadding - shortAxisEndPadding
- (cellWidth * shortAxisCells);
if (numShortGaps > 0) {
mWidthGap = hSpaceLeft / numShortGaps;
} else {
mWidthGap = 0;
}
} else {
int hSpaceLeft = widthSpecSize - longAxisStartPadding - longAxisEndPadding
- (cellWidth * longAxisCells);
mWidthGap = hSpaceLeft / numLongGaps;
int vSpaceLeft = heightSpecSize - shortAxisStartPadding - shortAxisEndPadding
- (cellHeight * shortAxisCells);
if (numShortGaps > 0) {
mHeightGap = vSpaceLeft / numShortGaps;
} else {
mHeightGap = 0;
}
}
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (mPortrait) {
lp.setup(cellWidth, cellHeight, mWidthGap, mHeightGap, shortAxisStartPadding,
longAxisStartPadding);
} else {
lp.setup(cellWidth, cellHeight, mWidthGap, mHeightGap, longAxisStartPadding,
shortAxisStartPadding);
}
int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY);
int childheightMeasureSpec =
MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
child.measure(childWidthMeasureSpec, childheightMeasureSpec);
}
setMeasuredDimension(widthSpecSize, heightSpecSize);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams();
int childLeft = lp.x;
int childTop = lp.y;
child.layout(childLeft, childTop, childLeft + lp.width, childTop + lp.height);
}
}
}
@Override
protected void setChildrenDrawingCacheEnabled(boolean enabled) {
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View view = getChildAt(i);
view.setDrawingCacheEnabled(enabled);
// Update the drawing caches
view.buildDrawingCache();
}
}
@Override
protected void setChildrenDrawnWithCacheEnabled(boolean enabled) {
super.setChildrenDrawnWithCacheEnabled(enabled);
}
boolean acceptChildDrop(int x, int y, int cellHSpan, int cellVSpan, View cell) {
int[] cellXY = mCellXY;
pointToCellRounded(x, y, cellXY);
int cellX = cellXY[0];
int cellY = cellXY[1];
return findCell(cellX, cellY, cellHSpan, cellVSpan, cell) == null;
}
/**
* Finds the first View intersecting with the specified cell. If the cell is outside
* of the layout, this is returned.
*
* @param cellX The X location of the cell to test.
* @param cellY The Y location of the cell to test.
* @param cellHSpan The horizontal span of the cell to test.
* @param cellVSpan The vertical span of the cell to test.
* @param ignoreCell View to ignore during the test.
*
* @return Returns the first View intersecting with the specified cell, this if the cell
* lies outside of this layout's grid or null if no View was found.
*/
View findCell(int cellX, int cellY, int cellHSpan, int cellVSpan, View ignoreCell) {
if (cellX < 0 || cellX + cellHSpan > (mPortrait ? mShortAxisCells : mLongAxisCells) ||
cellY < 0 || cellY + cellVSpan > (mPortrait ? mLongAxisCells : mShortAxisCells)) {
return this;
}
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View view = getChildAt(i);
if (view == ignoreCell) {
continue;
}
final LayoutParams lp = (LayoutParams) view.getLayoutParams();
if (cellX < lp.cellX + lp.cellHSpan && lp.cellX < cellX + cellHSpan &&
cellY < lp.cellY + lp.cellVSpan && lp.cellY < cellY + cellVSpan) {
return view;
}
}
return null;
}
/**
* Drop a child at the specified position
*
* @param child The child that is being dropped
* @param cellX The child's new x location
* @param cellY The child's new y location
*/
void onDropChild(View child, int cellX, int cellY) {
int[] cellXY = mCellXY;
pointToCellRounded(cellX, cellY, cellXY);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
lp.cellX = cellXY[0];
lp.cellY = cellXY[1];
lp.isDragging = false;
mDragRect.setEmpty();
child.requestLayout();
invalidate();
}
void onDropAborted(View child) {
if (child != null) {
((LayoutParams) child.getLayoutParams()).isDragging = false;
invalidate();
}
mDragRect.setEmpty();
}
/**
* Start dragging the specified child
*
* @param child The child that is being dragged
*/
void onDragChild(View child) {
LayoutParams lp = (LayoutParams) child.getLayoutParams();
lp.isDragging = true;
mDragRect.setEmpty();
}
/**
* Drag a child over the specified position
*
* @param child The child that is being dropped
* @param cellX The child's new x cell location
* @param cellY The child's new y cell location
*/
void onDragOverChild(View child, int cellX, int cellY) {
int[] cellXY = mCellXY;
pointToCellRounded(cellX, cellY, cellXY);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
cellToRect(cellXY[0], cellXY[1], lp.cellHSpan, lp.cellVSpan, mDragRect);
invalidate();
}
/**
* Computes a bounding rectangle for a range of cells
*
* @param cellX X coordinate of upper left corner expressed as a cell position
* @param cellY Y coordinate of upper left corner expressed as a cell position
* @param cellHSpan Width in cells
* @param cellVSpan Height in cells
* @param dragRect Rectnagle into which to put the results
*/
public void cellToRect(int cellX, int cellY, int cellHSpan, int cellVSpan, RectF dragRect) {
final boolean portrait = mPortrait;
final int cellWidth = mCellWidth;
final int cellHeight = mCellHeight;
final int widthGap = mWidthGap;
final int heightGap = mHeightGap;
final int hStartPadding = portrait ? mShortAxisStartPadding : mLongAxisStartPadding;
final int vStartPadding = portrait ? mLongAxisStartPadding : mShortAxisStartPadding;
int width = cellHSpan * cellWidth + ((cellHSpan - 1) * widthGap);
int height = cellVSpan * cellHeight + ((cellVSpan - 1) * heightGap);
int x = hStartPadding + cellX * (cellWidth + widthGap);
int y = vStartPadding + cellY * (cellHeight + heightGap);
dragRect.set(x, y, x + width, y + height);
}
/**
* Computes the required horizontal and vertical cell spans to always
* fit the given rectangle.
*
* @param width Width in pixels
* @param height Height in pixels
*/
public int[] rectToCell(int width, int height) {
// Always assume we're working with the smallest span to make sure we
// reserve enough space in both orientations.
int actualWidth = mCellWidth + mWidthGap;
int actualHeight = mCellHeight + mHeightGap;
int smallerSize = Math.min(actualWidth, actualHeight);
// Always round up to next largest cell
int spanX = (width + smallerSize) / smallerSize;
int spanY = (height + smallerSize) / smallerSize;
return new int[] { spanX, spanY };
}
/**
* Find the first vacant cell, if there is one.
*
* @param vacant 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
*/
public boolean getVacantCell(int[] vacant, int spanX, int spanY) {
final boolean portrait = mPortrait;
final int xCount = portrait ? mShortAxisCells : mLongAxisCells;
final int yCount = portrait ? mLongAxisCells : mShortAxisCells;
final boolean[][] occupied = mOccupied;
findOccupiedCells(xCount, yCount, occupied);
return findVacantCell(vacant, spanX, spanY, xCount, yCount, occupied);
}
static boolean findVacantCell(int[] vacant, int spanX, int spanY,
int xCount, int yCount, boolean[][] occupied) {
for (int x = 0; x < xCount; x++) {
for (int y = 0; y < yCount; y++) {
boolean available = !occupied[x][y];
out: for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
for (int j = y; j < y + spanY - 1 && y < yCount; j++) {
available = available && !occupied[i][j];
if (!available) break out;
}
}
if (available) {
vacant[0] = x;
vacant[1] = y;
return true;
}
}
}
return false;
}
boolean[] getOccupiedCells() {
final boolean portrait = mPortrait;
final int xCount = portrait ? mShortAxisCells : mLongAxisCells;
final int yCount = portrait ? mLongAxisCells : mShortAxisCells;
final boolean[][] occupied = mOccupied;
findOccupiedCells(xCount, yCount, occupied);
final boolean[] flat = new boolean[xCount * yCount];
for (int y = 0; y < yCount; y++) {
for (int x = 0; x < xCount; x++) {
flat[y * xCount + x] = occupied[x][y];
}
}
return flat;
}
private void findOccupiedCells(int xCount, int yCount, boolean[][] occupied) {
for (int x = 0; x < xCount; x++) {
for (int y = 0; y < yCount; y++) {
occupied[x][y] = false;
}
}
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child instanceof Folder) {
continue;
}
LayoutParams lp = (LayoutParams) child.getLayoutParams();
for (int x = lp.cellX; x < lp.cellX + lp.cellHSpan && x < xCount; x++) {
for (int y = lp.cellY; y < lp.cellY + lp.cellVSpan && y < yCount; y++) {
occupied[x][y] = true;
}
}
}
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new CellLayout.LayoutParams(getContext(), attrs);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof CellLayout.LayoutParams;
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new CellLayout.LayoutParams(p);
}
public static class LayoutParams extends ViewGroup.MarginLayoutParams {
/**
* Horizontal location of the item in the grid.
*/
@ViewDebug.ExportedProperty
public int cellX;
/**
* Vertical location of the item in the grid.
*/
@ViewDebug.ExportedProperty
public int cellY;
/**
* Number of cells spanned horizontally by the item.
*/
@ViewDebug.ExportedProperty
public int cellHSpan;
/**
* Number of cells spanned vertically by the item.
*/
@ViewDebug.ExportedProperty
public int cellVSpan;
/**
* Is this item currently being dragged
*/
public boolean isDragging;
// X coordinate of the view in the layout.
@ViewDebug.ExportedProperty
int x;
// Y coordinate of the view in the layout.
@ViewDebug.ExportedProperty
int y;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
cellHSpan = 1;
cellVSpan = 1;
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
cellHSpan = 1;
cellVSpan = 1;
}
public LayoutParams(int cellX, int cellY, int cellHSpan, int cellVSpan) {
super(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
this.cellX = cellX;
this.cellY = cellY;
this.cellHSpan = cellHSpan;
this.cellVSpan = cellVSpan;
}
public void setup(int cellWidth, int cellHeight, int widthGap, int heightGap,
int hStartPadding, int vStartPadding) {
final int myCellHSpan = cellHSpan;
final int myCellVSpan = cellVSpan;
final int myCellX = cellX;
final int myCellY = cellY;
width = myCellHSpan * cellWidth + ((myCellHSpan - 1) * widthGap) -
leftMargin - rightMargin;
height = myCellVSpan * cellHeight + ((myCellVSpan - 1) * heightGap) -
topMargin - bottomMargin;
x = hStartPadding + myCellX * (cellWidth + widthGap) + leftMargin;
y = vStartPadding + myCellY * (cellHeight + heightGap) + topMargin;
}
}
static final class CellInfo implements ContextMenu.ContextMenuInfo {
/**
* See View.AttachInfo.InvalidateInfo for futher explanations about
* the recycling mechanism. In this case, we recycle the vacant cells
* instances because up to several hundreds can be instanciated when
* the user long presses an empty cell.
*/
static final class VacantCell {
int cellX;
int cellY;
int spanX;
int spanY;
// We can create up to 523 vacant cells on a 4x4 grid, 100 seems
// like a reasonable compromise given the size of a VacantCell and
// the fact that the user is not likely to touch an empty 4x4 grid
// very often
private static final int POOL_LIMIT = 100;
private static final Object sLock = new Object();
private static int sAcquiredCount = 0;
private static VacantCell sRoot;
private VacantCell next;
static VacantCell acquire() {
synchronized (sLock) {
if (sRoot == null) {
return new VacantCell();
}
VacantCell info = sRoot;
sRoot = info.next;
sAcquiredCount--;
return info;
}
}
void release() {
synchronized (sLock) {
if (sAcquiredCount < POOL_LIMIT) {
sAcquiredCount++;
next = sRoot;
sRoot = this;
}
}
}
@Override
public String toString() {
return "VacantCell[x=" + cellX + ", y=" + cellY + ", spanX=" + spanX +
", spanY=" + spanY + "]";
}
}
View cell;
int cellX;
int cellY;
int spanX;
int spanY;
int screen;
boolean valid;
final ArrayList<VacantCell> vacantCells = new ArrayList<VacantCell>(VacantCell.POOL_LIMIT);
int maxVacantSpanX;
int maxVacantSpanXSpanY;
int maxVacantSpanY;
int maxVacantSpanYSpanX;
final Rect current = new Rect();
private void clearVacantCells() {
final ArrayList<VacantCell> list = vacantCells;
final int count = list.size();
for (int i = 0; i < count; i++) list.get(i).release();
list.clear();
}
void findVacantCellsFromOccupied(boolean[] occupied, int xCount, int yCount) {
if (cellX < 0 || cellY < 0) {
maxVacantSpanX = maxVacantSpanXSpanY = Integer.MIN_VALUE;
maxVacantSpanY = maxVacantSpanYSpanX = Integer.MIN_VALUE;
clearVacantCells();
return;
}
final boolean[][] unflattened = new boolean[xCount][yCount];
for (int y = 0; y < yCount; y++) {
for (int x = 0; x < xCount; x++) {
unflattened[x][y] = occupied[y * xCount + x];
}
}
CellLayout.findIntersectingVacantCells(this, cellX, cellY, xCount, yCount, unflattened);
}
/**
* This method can be called only once! Calling #findVacantCellsFromOccupied will
* restore the ability to call this method.
*
* Finds the upper-left coordinate of the first rectangle in the grid that can
* hold a cell of the specified dimensions.
*
* @param cellXY The array that will contain the position of a vacant cell if such a cell
* can be found.
* @param spanX The horizontal span of the cell we want to find.
* @param spanY The vertical span of the cell we want to find.
*
* @return True if a vacant cell of the specified dimension was found, false otherwise.
*/
boolean findCellForSpan(int[] cellXY, int spanX, int spanY) {
final ArrayList<VacantCell> list = vacantCells;
final int count = list.size();
boolean found = false;
if (this.spanX >= spanX && this.spanY >= spanY) {
cellXY[0] = cellX;
cellXY[1] = cellY;
found = true;
}
// Look for an exact match first
for (int i = 0; i < count; i++) {
VacantCell cell = list.get(i);
if (cell.spanX == spanX && cell.spanY == spanY) {
cellXY[0] = cell.cellX;
cellXY[1] = cell.cellY;
found = true;
break;
}
}
// Look for the first cell large enough
for (int i = 0; i < count; i++) {
VacantCell cell = list.get(i);
if (cell.spanX >= spanX && cell.spanY >= spanY) {
cellXY[0] = cell.cellX;
cellXY[1] = cell.cellY;
found = true;
break;
}
}
clearVacantCells();
return found;
}
@Override
public String toString() {
return "Cell[view=" + (cell == null ? "null" : cell.getClass()) + ", x=" + cellX +
", y=" + cellY + "]";
}
}
}
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