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- /*
- * Copyright 2000-2018 Vaadin Ltd.
- *
- * 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.vaadin.client.ui;
-
- import com.google.gwt.core.client.Scheduler.ScheduledCommand;
- import com.google.gwt.user.client.Timer;
-
- /**
- * Executes the given command {@code delayMs} milliseconds after a call to
- * {@link #trigger()}. Calling {@link #trigger()} again before the command has
- * been executed causes the execution to be rescheduled to {@code delayMs} after
- * the second call.
- *
- */
- public class VLazyExecutor {
-
- private Timer timer;
- private int delayMs;
- private ScheduledCommand cmd;
-
- /**
- * @param delayMs
- * Delay in milliseconds to wait before executing the command
- * @param cmd
- * The command to execute
- */
- public VLazyExecutor(int delayMs, ScheduledCommand cmd) {
- this.delayMs = delayMs;
- this.cmd = cmd;
- }
-
- /**
- * Triggers execution of the command. Each call reschedules any existing
- * execution to {@link #delayMs} milliseconds from that point in time.
- */
- public void trigger() {
- if (timer == null) {
- timer = new Timer() {
- @Override
- public void run() {
- timer = null;
- cmd.execute();
- }
- };
- }
- // Schedule automatically cancels any old schedule
- timer.schedule(delayMs);
-
- }
-
- }
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