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lib/Alien/GvaScript/lib/GvaScript.js  view on Meta::CPAN

            }
        }
        function _tabHandler(event) {
            if (this.options.preventListBlur)
                if (this.isLast(this.selectedBtn))
                    Event.stop(event);
        }
        function _shiftTabHandler(event) {
            if (this.options.preventListBlur)
                if (this.isFirst(this.selectedBtn))
                    Event.stop(event);
        }
        function _homeHandler(event) {
            if (this.selectedBtn) {
                this.select(this.firstBtn());
                Event.stop(event);
            }
        }
        function _endHandler(event) {
            if (this.selectedBtn) {
                this.select(this.lastBtn());
                Event.stop(event);
            }
        }
        function _addHandlers() {
            this.buttons.each(function(btnContainer) {
                var btn;
                // if the button is a GvaScript.CustomButtons.BUTTON, then the actual <button> element
                // will be embedded and selectable via .btn classname:
                // <span class="gva-btn-container">
                //         <span class="left"/>
                //         <span class="center">
                //                 <button accesskey="r" class="btn" style="width: auto;" id="btn_1226916357164">
                //                         Rechercher dans Calvin
                //                 </button>
                //         </span>
                //         <span class="right"/>
                // </span>
                // this will be cleaner when all application buttons are transformed into
                // GvaScript.CustomButtons.Button instances
                if(btnContainer.tagName.search(/^(INPUT|BUTTON)$/i) > -1) btn = btnContainer;
                else {
                    btn = btnContainer.down('.btn');
                    btn.visible        = function() {return btnContainer.visible();}
                    // support focus function on span.buttonContainer
                    btnContainer.focus = function() {btn.focus();}
                }

                if(typeof btn == 'undefined') return;

            }, this);

            this.container.register('button.btn', 'focus', function(e) {
                this.select.call(this, e._target.up('.'+bcss+'-btn-container'));
            }.bind(this));
            this.container.register('button.btn', 'blur', function(e) {
                this.select.call(this, null);
            }.bind(this));
        }

        // public members
        return {
            destroy: function() {
                // test that element still in DOM
                if(this.container) this.container.unregister();
                this.keymap.destroy();
            },
            initialize: function(container, options) {
                var defaults = {
                    preventListBlur     : false,
                    flashDuration       : 100,     // milliseconds
                    flashClassName      : 'flash',
                    keymap              : null,
                    selectFirstBtn      : true,
                    className           : bcss+'-button'
                };
                this.options   = Object.extend(defaults, options || {});
                this.container = $(container);

                // initializing the keymap
                var keyHandlers = {
                    LEFT:       _leftHandler     .bindAsEventListener(this),
                    RIGHT:      _rightHandler    .bindAsEventListener(this),
                    TAB:        _tabHandler      .bindAsEventListener(this),
                    S_TAB:      _shiftTabHandler .bindAsEventListener(this),
                    HOME:       _homeHandler     .bindAsEventListener(this),
                    END:        _endHandler      .bindAsEventListener(this)
                };
                this.keymap = new GvaScript.KeyMap(keyHandlers);
                this.keymap.observe("keydown", container, {
                    preventDefault:false,
                    stopPropagation:false
                });

                // get all buttons of designated className regardless of their
                // visibility jump over hidden ones when navigating
                this.buttons = this.container.select('.'+this.options.className);
                _addHandlers.call(this);

                if (this.options.selectFirstBtn) {
                    if(firstButObj = this.firstBtn()) {
                        this.select(firstButObj);
                    }
                    // set the focus on the container anyways so that the focus
                    // gets trasferred successfully to windows with empty
                    // actionsbar
                    else {
                        this.container.writeAttribute('tabindex', 0);
                        this.container.focus();
                    }
                }
            },
            select: function (btn) {
                var previousBtn = this.selectedBtn || null;
                if (previousBtn === btn) return; // selection already handled

                // blur the previously selected button
                if (previousBtn) {
                    previousBtn.removeClassName('btn-focus');
                }
                this.selectedBtn = btn;