Add ability to delay messages in Filter based on constraint. Use this to... (8bf92e00) · Commits · e / os / android_frameworks_base

core/java/android/app/SuggestionsAdapter.java

+19 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,7 @@ import android.view.ViewGroup;
		import android.widget.ImageView;
		import android.widget.ResourceCursorAdapter;
		import android.widget.TextView;
		import android.widget.Filter;

		import java.io.FileNotFoundException;
		import java.io.IOException;
		@@ -90,6 +91,12 @@ class SuggestionsAdapter extends ResourceCursorAdapter {
		private final Runnable mStartSpinnerRunnable;
		private final Runnable mStopSpinnerRunnable;

		/**
		* The amount of time we delay in the filter when the user presses the delete key.
		* @see Filter#setDelayer(android.widget.Filter.Delayer).
		*/
		private static final long DELETE_KEY_POST_DELAY = 500L;

		public SuggestionsAdapter(Context context, SearchDialog searchDialog, SearchableInfo searchable,
		WeakHashMap<String, Drawable> outsideDrawablesCache, boolean globalSearchMode) {
		super(context,
		@@ -119,6 +126,18 @@ class SuggestionsAdapter extends ResourceCursorAdapter {
		mSearchDialog.setWorking(false);
		}
		};

		// delay 500ms when deleting
		getFilter().setDelayer(new Filter.Delayer() {

		private int mPreviousLength = 0;

		public long getPostingDelay(CharSequence constraint) {
		long delay = constraint.length() < mPreviousLength ? DELETE_KEY_POST_DELAY : 0;
		mPreviousLength = constraint.length();
		return delay;
		}
		});
		}

		/**

core/java/android/widget/Filter.java

+32 −1

Original line number	Diff line number	Diff line
		@@ -46,6 +46,8 @@ public abstract class Filter {
		private Handler mThreadHandler;
		private Handler mResultHandler;

		private Delayer mDelayer;

		private final Object mLock = new Object();

		/**
		@@ -55,6 +57,20 @@ public abstract class Filter {
		mResultHandler = new ResultsHandler();
		}

		/**
		* Provide an interface that decides how long to delay the message for a given query. Useful
		* for heuristics such as posting a delay for the delete key to avoid doing any work while the
		* user holds down the delete key.
		*
		* @param delayer The delayer.
		* @hide
		*/
		public void setDelayer(Delayer delayer) {
		synchronized (mLock) {
		mDelayer = delayer;
		}
		}

		/**
		* <p>Starts an asynchronous filtering operation. Calling this method
		* cancels all previous non-executed filtering requests and posts a new
		@@ -91,6 +107,8 @@ public abstract class Filter {
		mThreadHandler = new RequestHandler(thread.getLooper());
		}

		final long delay = (mDelayer == null) ? 0 : mDelayer.getPostingDelay(constraint);

		Message message = mThreadHandler.obtainMessage(FILTER_TOKEN);

		RequestArguments args = new RequestArguments();
		@@ -102,7 +120,7 @@ public abstract class Filter {

		mThreadHandler.removeMessages(FILTER_TOKEN);
		mThreadHandler.removeMessages(FINISH_TOKEN);
		mThreadHandler.sendMessage(message);
		mThreadHandler.sendMessageDelayed(message, delay);
		}
		}

		@@ -289,4 +307,17 @@ public abstract class Filter {
		*/
		FilterResults results;
		}

		/**
		* @hide
		*/
		public interface Delayer {

		/**
		* @param constraint The constraint passed to {@link Filter#filter(CharSequence)}
		* @return The delay that should be used for
		* {@link Handler#sendMessageDelayed(android.os.Message, long)}
		*/
		long getPostingDelay(CharSequence constraint);
		}
		}