public void onDrop(DragObject d) {
ShortcutInfo item;
if (d.dragInfo instanceof ApplicationInfo) {
// 如果是来自“所有程序”界面，那么复制这个item
item = ((ApplicationInfo) d.dragInfo).makeShortcut();
item.spanX = 1;
item.spanY = 1;
} else {
item = (ShortcutInfo) d.dragInfo;
}
// Dragged from self onto self, currently this is the only path
// possible, however
// we keep this as a distinct code path.
// 这个判断应该不可能出现别的情况，当前手动对象当然应该是这个d，这是过于谨慎的判断
if (item == mCurrentDragInfo) {
ShortcutInfo si = (ShortcutInfo) mCurrentDragView.getTag();
CellLayout.LayoutParams lp = (CellLayout.LayoutParams) mCurrentDragView.getLayoutParams();
si.cellX = lp.cellX = mEmptyCell[0];
si.cellX = lp.cellY = mEmptyCell[1];
mContent.addViewToCellLayout(mCurrentDragView, -1, (int) item.id, lp, true);
if (d.dragView.hasDrawn()) {
mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, mCurrentDragView);
} else {
d.deferDragViewCleanupPostAnimation = false;
mCurrentDragView.setVisibility(VISIBLE);
}
mItemsInvalidated = true;
// 拖进来后重新设置Folder的大小
setupContentDimensions(getItemCount());
mSuppressOnAdd = true;
}
mInfo.add(item);
}
@Override
public boolean acceptDrop(DragObject d) {
// acceptDrop is called just before onDrop. We do the work here, rather than
// in onDrop, because it allows us to reject the drop (by returning false)
// so that the object being dragged isn't removed from the drag source.
ComponentName componentName = null;
if (d.dragInfo instanceof ApplicationInfo) {
componentName = ((ApplicationInfo) d.dragInfo).componentName;
} else if (d.dragInfo instanceof ShortcutInfo) {
componentName = ((ShortcutInfo) d.dragInfo).intent.getComponent();
} else if (d.dragInfo instanceof PendingAddItemInfo) {
componentName = ((PendingAddItemInfo) d.dragInfo).componentName;
}
if (componentName != null) {
mLauncher.startApplicationDetailsActivity(componentName);
}
// There is no post-drop animation, so clean up the DragView now
d.deferDragViewCleanupPostAnimation = false;
return false;
}
public void onDrop(DragObject d) {
Runnable cleanUpRunnable = null;
// If we are coming from All Apps space, we defer removing the extra empty screen
// until the folder closes
if (d.dragSource != mLauncher.getWorkspace() && !(d.dragSource instanceof Folder)) {
cleanUpRunnable =
new Runnable() {
@Override
public void run() {
mLauncher.exitSpringLoadedDragModeDelayed(
true, Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
}
};
}
View currentDragView;
ShortcutInfo si = mCurrentDragInfo;
if (mIsExternalDrag) {
si.cellX = mEmptyCell[0];
si.cellY = mEmptyCell[1];
// Actually move the item in the database if it was an external drag. Call this
// before creating the view, so that ShortcutInfo is updated appropriately.
LauncherModel.addOrMoveItemInDatabase(mLauncher, si, mInfo.id, 0, si.cellX, si.cellY);
// We only need to update the locations if it doesn't get handled in #onDropCompleted.
if (d.dragSource != this) {
updateItemLocationsInDatabaseBatch();
}
mIsExternalDrag = false;
currentDragView = createAndAddShortcut(si);
} else {
currentDragView = mCurrentDragView;
CellLayout.LayoutParams lp = (CellLayout.LayoutParams) currentDragView.getLayoutParams();
si.cellX = lp.cellX = mEmptyCell[0];
si.cellX = lp.cellY = mEmptyCell[1];
mContent.addViewToCellLayout(currentDragView, -1, (int) si.id, lp, true);
}
if (d.dragView.hasDrawn()) {
// Temporarily reset the scale such that the animation target gets calculated correctly.
float scaleX = getScaleX();
float scaleY = getScaleY();
setScaleX(1.0f);
setScaleY(1.0f);
mLauncher
.getDragLayer()
.animateViewIntoPosition(d.dragView, currentDragView, cleanUpRunnable, null);
setScaleX(scaleX);
setScaleY(scaleY);
} else {
d.deferDragViewCleanupPostAnimation = false;
currentDragView.setVisibility(VISIBLE);
}
mItemsInvalidated = true;
setupContentDimensions(getItemCount());
// Temporarily suppress the listener, as we did all the work already here.
mSuppressOnAdd = true;
mInfo.add(si);
mSuppressOnAdd = false;
// Clear the drag info, as it is no longer being dragged.
mCurrentDragInfo = null;
}