/*
 * Copyright 2008 Google Inc.
 * 
 * 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.google.gwt.dom.client;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * Provides programmatic access to properties of the style object.
 * 
 * @see Element#getStyle()
 */
public class Style extends JavaScriptObject {

  protected Style() {
  }

  /**
   * Gets the value of a named property.
   */
  public final String getProperty(String name) {
    assertCamelCase(name);
    return getPropertyImpl(name);
  }

  /**
   * Sets the value of a named property.
   */
  public final void setProperty(String name, String value) {
    assertCamelCase(name);
    setPropertyImpl(name, value);
  }

  /**
   * Sets the value of a named property, in pixels.
   * 
   * This is shorthand for <code>value + "px"</code>.
   */
  public final void setPropertyPx(String name, int value) {
    assertCamelCase(name);
    setPropertyPxImpl(name, value);
  }

  /**
   * Assert that the specified property does not contain a hyphen.
   * 
   * @param name the property name
   */
  private void assertCamelCase(String name) {
    assert !name.contains("-") : "The style name '" + name
        + "' should be in camelCase format";
  }

  /**
   * Gets the value of a named property.
   */
  private native String getPropertyImpl(String name) /*-{
     return this[name];
   }-*/;

  /**
   * Sets the value of a named property.
   */
  private native void setPropertyImpl(String name, String value) /*-{
     this[name] = value;
   }-*/;

  /**
   * Sets the value of a named property, in pixels.
   * 
   * This is shorthand for <code>value + "px"</code>.
   */
  private native void setPropertyPxImpl(String name, int value) /*-{
     this[name] = value + "px";
   }-*/;
}