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-rw-r--r--src/com/android/launcher/CellLayout.java155
1 files changed, 134 insertions, 21 deletions
diff --git a/src/com/android/launcher/CellLayout.java b/src/com/android/launcher/CellLayout.java
index 02646bf..3e5a74a 100644
--- a/src/com/android/launcher/CellLayout.java
+++ b/src/com/android/launcher/CellLayout.java
@@ -56,6 +56,8 @@ public class CellLayout extends ViewGroup {
private RectF mDragRect = new RectF();
+ private boolean mDirtyTag;
+
public CellLayout(Context context) {
this(context, null);
}
@@ -157,6 +159,7 @@ public class CellLayout extends ViewGroup {
cellInfo.spanY = lp.cellVSpan;
cellInfo.valid = true;
found = true;
+ mDirtyTag = false;
break;
}
}
@@ -181,10 +184,12 @@ public class CellLayout extends ViewGroup {
cellInfo.valid = cellXY[0] >= 0 && cellXY[1] >= 0 && cellXY[0] < xCount &&
cellXY[1] < yCount && !occupied[cellXY[0]][cellXY[1]];
- if (cellInfo.valid) {
- findIntersectingVacantCells(cellInfo, cellXY[0], cellXY[1],
- xCount, yCount, occupied);
- }
+ // 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) {
@@ -194,12 +199,31 @@ public class CellLayout extends ViewGroup {
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) {
@@ -207,14 +231,15 @@ public class CellLayout extends ViewGroup {
cellInfo.maxVacantSpanXSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanYSpanX = Integer.MIN_VALUE;
- cellInfo.vacantCells = new ArrayList<CellInfo.VacantCell>();
+ cellInfo.clearVacantCells();
if (occupied[x][y]) {
return;
}
- Rect current = new Rect(x, y, x, y);
- findVacantCell(current, xCount, yCount, occupied, cellInfo);
+ 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,
@@ -256,7 +281,7 @@ public class CellLayout extends ViewGroup {
}
private static void addVacantCell(Rect current, CellInfo cellInfo) {
- CellInfo.VacantCell cell = new CellInfo.VacantCell();
+ CellInfo.VacantCell cell = CellInfo.VacantCell.acquire();
cell.cellX = current.left;
cell.cellY = current.top;
cell.spanX = current.right - current.left + 1;
@@ -317,10 +342,9 @@ public class CellLayout extends ViewGroup {
cellInfo.maxVacantSpanXSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanY = Integer.MIN_VALUE;
cellInfo.maxVacantSpanYSpanX = Integer.MIN_VALUE;
- cellInfo.vacantCells = new ArrayList<CellInfo.VacantCell>();
cellInfo.screen = mCellInfo.screen;
- Rect current = new Rect();
+ Rect current = cellInfo.current;
for (int x = 0; x < xCount; x++) {
for (int y = 0; y < yCount; y++) {
@@ -634,6 +658,26 @@ public class CellLayout extends ViewGroup {
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
+ * @param cellInfo {@link CellInfo} to fill with calculated span parameters
+ */
+ public void rectToCell(int width, int height, CellInfo cellInfo) {
+ // 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
+ cellInfo.spanX = (width + smallerSize) / smallerSize;
+ cellInfo.spanY = (height + smallerSize) / smallerSize;
+ }
/**
* Find the first vacant cell, if there is one.
@@ -811,12 +855,54 @@ out: for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
}
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 +
@@ -832,17 +918,27 @@ out: for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
int screen;
boolean valid;
- ArrayList<VacantCell> vacantCells;
+ 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;
- vacantCells = new ArrayList<VacantCell>();
+ clearVacantCells();
return;
}
@@ -855,26 +951,40 @@ out: for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
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) {
- if (vacantCells == null) {
- return false;
- }
+ 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;
- return true;
+ found = true;
}
- final ArrayList<VacantCell> list = vacantCells;
- final int count = list.size();
// 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;
- return true;
+ found = true;
+ break;
}
}
@@ -884,11 +994,14 @@ out: for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
if (cell.spanX >= spanX && cell.spanY >= spanY) {
cellXY[0] = cell.cellX;
cellXY[1] = cell.cellY;
- return true;
+ found = true;
+ break;
}
}
- return false;
+ clearVacantCells();
+
+ return found;
}
@Override
generated by cgit v1.1 at 2024-12-25 03:22:17 +0000