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// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

package org.cef.handler;

import org.cef.browser.CefBrowser;

/**
 * Implement this interface to handle events related to focus. The methods of
 * this class will be called on the UI thread.
 */
public interface CefFocusHandler {
    /**
     * Focus sources.
     */
    enum FocusSource {
        FOCUS_SOURCE_NAVIGATION, //!< The source is explicit navigation via the API (LoadURL(),
                                 //! etc).
        FOCUS_SOURCE_SYSTEM //!< The source is a system-generated focus event.
    }

    /**
     * Called when the browser component is about to loose focus.
     * For instance, if focus was on the last HTML element and the
     * user pressed the TAB key.
     * @param browser The browser generating the event.
     * @param next will be true if the browser is giving focus to the
     *        next component and false if the browser is giving focus
     *        to the previous component.
     */
    public void onTakeFocus(CefBrowser browser, boolean next);

    /**
     * Called when the browser component is requesting focus.
     * @param browser The browser generating the event.
     * @param source indicates/ where the focus request is originating from.
     *
     * @return false to allow the focus to be set or true to cancel setting the focus.
     */
    public boolean onSetFocus(CefBrowser browser, FocusSource source);

    /**
     * Called when the browser component has received focus.
     * @param browser The browser generating the event.
     */
    public void onGotFocus(CefBrowser browser);
}