/*!

  \file zoombar.js This module contains the ZoomBar class.

*/

/*!

  user presses the zoom button on the toolbar. It provides access to the zoom

  in and out functions. It is hidden when the main toolbar is hidden on user inactivity

*/

{

    var timeoutId = 0; // inactivity timer ID

    var ZB_TIMEOUT = 5000; // hide zoombar after 5 secs

    var zooming = false; // true when in the process of zooming

    var enabled = true; // zooming enabled flag - initially enabled

    // Private Methods

    //! Write zoom bar HTML code to document.

    function _zoombar_write() {

        var html = ''+

            '<div id="zoomBarDiv">'+

            '<img class="zoomBarBtn" id="zoomBarBtnIn">'+

            '<img class="zoomBarBtn" id="zoomBarBtnOut">'+

            '</div>';

        document.write(html);

    }

    //! Create zoom in & out buttons.

    function _setActions() {

        new ActionButton("zoomBarBtnIn",

                         "zoombar.snippet/icons/icon_zoom+.png",

                         "zoombar.snippet/icons/icon_zoom+_pressed.png",

                         "zoombar.snippet/icons/icon_zoom+_disabled.png",

                         window.views.WebView.actions.zoomIn,

                         true,true,true);

        new ActionButton("zoomBarBtnOut",

                         "zoombar.snippet/icons/icon_zoom-.png",

                         "zoombar.snippet/icons/icon_zoom-_pressed.png",

                         "zoombar.snippet/icons/icon_zoom-_disabled.png",

                         window.views.WebView.actions.zoomOut,

                         true,true,true);

        // reset toolbar timeout each time a zoom is triggered

//        window.views.WebView.actions.zoomIn.triggered.connect(

//            function(checked) {handleZoom();});

//        window.views.WebView.actions.zoomOut.triggered.connect(

//            function(checked) {handleZoom();});

        // Connect to each action's "changed" signal.

        window.views.WebView.actions.zoomIn.changed.connect(

            createDelegate(this, handleChange));

        window.views.WebView.actions.zoomOut.changed.connect(

            createDelegate(this, handleChange));

    }

    //! Set inactivity timer when not zooming.

    function handleZoom()

    {

        // zoom activation toggles zoom on/off

        zooming = !zooming; // toggle zoom state

        clearTimeout(timeoutId);

        if (!zooming) {

            // close zoom after 5 secs

            timeoutId = setTimeout('window.snippets.ZoomBarId.hide()', ZB_TIMEOUT);

        }

    }

    //! Start inactivity timer when zoom bar is shown.

    function handleShow()

    {

        timeoutId = setTimeout('window.snippets.ZoomBarId.hide()', ZB_TIMEOUT); // close zoom after 5 secs

    }

    //! Clear inactivity timer when zoom bar is hidden.

    function handleHide()

    {

        clearTimeout(timeoutId);

        zooming = false; // ensure zooming state doesn't get out of sync

    }

    //! Handle action object changes. In particular we are interested in

    //! changes to the enabled state of the object.

    function handleChange() {

        var saveEnabled = enabled;

        // enable zoom button if either zoom-in or zoom-out action enabled

        if (window.views.WebView.actions.zoomIn.enabled

            || window.views.WebView.actions.zoomOut.enabled) {

            enabled = true;

        } else {

            enabled = false;

        }

        // if state changed update web toolbar zoom button state

        if (saveEnabled != enabled) {

            // enabled state changed

        }

    }

    function handleLoadStarted() {

        window.snippets.ZoomBarId.hide()

    }

    //! handlers.

    function _chromeLoadComplete() {

        _setActions();

        window.pageController.loadStarted.connect(handleLoadStarted);

//        window.snippets.ZoomBarId.shown.connect(handleShow);

//        window.snippets.ZoomBarId.hidden.connect(handleHide);

    }

    _zoombar_write();

    window.chrome.chromeComplete.connect(_chromeLoadComplete);

}