/*!

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

*/

/*!

  Class to handle displaying the zoom bar. The zoom bar is displayed when the

  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

*/

function ZoomBar()

{

    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">'+

            '</div>';

        document.write(html);

    }

    //! Create zoom in & out buttons.

    function _setActions() {

        // 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));

    }

    //! 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

            window.snippets.ZoomButtonSnippet.setEnabled(enabled);

        }

    }

    //! After chrome is loaded, create zoombar buttons and setup show/hide

    //! handlers.

    function _chromeLoadComplete() {

        _setActions();

    }

    _zoombar_write();

    window.chrome.chromeComplete.connect(_chromeLoadComplete);

}