com.flatown.client.SlideTimer.java Source code

Introduction

Here is the source code for com.flatown.client.SlideTimer.java

Source

/*
 * Copyright 2007 Jared Flatow
 * 
 * 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.flatown.client;

import com.google.gwt.user.client.ui.UIObject;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Timer;

/** 
 * A Timer to make elements slowly change size.
 */
public class SlideTimer extends Timer {

    public static final SlideTimer Singleton = new SlideTimer();
    public static boolean BUSY;
    private UIObject _obj;
    private int _curHeight, _endHeight, _inc, _dir;
    private static final int _timing = 10, _divisions = 20;

    private SlideTimer() {
        BUSY = false;
        _curHeight = 0;
        _endHeight = 100;
        _inc = 10;
    }

    public void run() {
        BUSY = true;
        if (Math.abs(_endHeight - _curHeight) > _inc) {
            if (_endHeight > _curHeight)
                _curHeight += _inc;
            else
                _curHeight -= _inc;
            _obj.setHeight(_curHeight + "px");
            schedule(_timing);
        } else {
            _obj.setHeight(_endHeight + "px");
            DOM.scrollIntoView(_obj.getElement());
            BUSY = false;
        }
    }

    public void slide(UIObject obj, int start, int end) {
        _obj = obj;
        _curHeight = start;
        _obj.setHeight(_curHeight + "px");
        _endHeight = end;
        _inc = Math.abs(_endHeight - _curHeight) / _divisions;
        run();
    }
}