Summary

YAHOO.ext.grid.PagedGridView = function(){
    YAHOO.ext.grid.PagedGridView.superclass.constructor.call(this);
    this.cursor = 1;
};
YAHOO.extendX(YAHOO.ext.grid.PagedGridView, YAHOO.ext.grid.GridView);

YAHOO.ext.grid.PagedGridView.prototype.appendFooter = function(parentEl){
    var fwrap = document.createElement('div');
    fwrap.className = 'ygrid-wrap-footer';
    var fbody = document.createElement('span');
    fbody.className = 'ygrid-footer';
    fwrap.appendChild(fbody);
    parentEl.appendChild(fwrap);
    this.createPagingToolbar(fbody);
    return fwrap;
};
YAHOO.ext.grid.PagedGridView.prototype.createPagingToolbar = function(container){
    var tb = new YAHOO.ext.Toolbar(container);
    this.pageToolbar = tb;
    this.first = tb.addButton({
        tooltip: this.firstText, 
        className: 'ygrid-page-first',
        disabled: true,
        click: this.onClick.createDelegate(this, ['first'])
    });
    this.prev = tb.addButton({
        tooltip: this.prevText, 
        className: 'ygrid-page-prev', 
        disabled: true,
        click: this.onClick.createDelegate(this, ['prev'])
    });
    tb.addSeparator();
    tb.add(this.beforePageText);
    var pageBox = document.createElement('input');
    pageBox.type = 'text';
    pageBox.size = 3;
    pageBox.value = '1';
    pageBox.className = 'ygrid-page-number';
    tb.add(pageBox);
    this.field = getEl(pageBox, true);
    this.field.mon('keydown', this.onEnter, this, true);
    this.field.on('focus', function(){pageBox.select();});
    this.afterTextEl = tb.addText(this.afterPageText.replace('%0', '1'));
    this.field.setHeight(18);
    tb.addSeparator();
    this.next = tb.addButton({
        tooltip: this.nextText, 
        className: 'ygrid-page-next', 
        disabled: true,
        click: this.onClick.createDelegate(this, ['next'])
    });
    this.last = tb.addButton({
        tooltip: this.lastText, 
        className: 'ygrid-page-last', 
        disabled: true,
        click: this.onClick.createDelegate(this, ['last'])
    });
    tb.addSeparator();
    this.loading = tb.addButton({
        tooltip: this.refreshText, 
        className: 'ygrid-loading',
        disabled: true,
        click: this.onClick.createDelegate(this, ['refresh'])
    });
    this.onPageLoaded(1, this.grid.dataModel.getTotalPages());
};
YAHOO.ext.grid.PagedGridView.prototype.getPageToolbar = function(){
    return this.pageToolbar;  
};

YAHOO.ext.grid.PagedGridView.prototype.onPageLoaded = function(pageNum, totalPages){
    this.cursor = pageNum;
    this.lastPage = totalPages;
    this.afterTextEl.innerHTML = this.afterPageText.replace('%0', totalPages);
    this.field.dom.value = pageNum;
    this.first.setDisabled(pageNum == 1);
    this.prev.setDisabled(pageNum == 1);
    this.next.setDisabled(pageNum == totalPages);
    this.last.setDisabled(pageNum == totalPages);
    this.loading.enable();
};

YAHOO.ext.grid.PagedGridView.prototype.onEnter = function(e){
    if(e.browserEvent.keyCode == e.RETURN){
        var v = this.field.dom.value;
        if(!v){
            this.field.dom.value = this.cursor;
            return;
        }
        var pageNum = parseInt(v, 10);
        if(isNaN(v)){
            this.field.dom.value = this.cursor;
            return;
        }
        pageNum = Math.min(Math.max(1, pageNum), this.lastPage);
        this.grid.dataModel.loadPage(pageNum);
        e.stopEvent();
    }
};

YAHOO.ext.grid.PagedGridView.prototype.beforeLoad = function(){
    if(this.loading){
        this.loading.disable();
    }  
};

YAHOO.ext.grid.PagedGridView.prototype.onClick = function(which){
    switch(which){
        case 'first':
            this.grid.dataModel.loadPage(1);
        break;
        case 'prev':
            this.grid.dataModel.loadPage(this.cursor -1);
        break;
        case 'next':
            this.grid.dataModel.loadPage(this.cursor + 1);
        break;
        case 'last':
            this.grid.dataModel.loadPage(this.lastPage);
        break;
        case 'refresh':
            this.grid.dataModel.loadPage(this.cursor);
        break;
    }
};

YAHOO.ext.grid.PagedGridView.prototype.render = function(){
    this.grid.dataModel.addListener('beforeload', this.beforeLoad, this, true);
    this.grid.dataModel.addListener('load', this.onPageLoaded, this, true);
    return YAHOO.ext.grid.PagedGridView.superclass.render.call(this);
};

YAHOO.ext.grid.PagedGridView.prototype.beforePageText = "Page";
YAHOO.ext.grid.PagedGridView.prototype.afterPageText = "of %0";
YAHOO.ext.grid.PagedGridView.prototype.firstText = "First Page";
YAHOO.ext.grid.PagedGridView.prototype.prevText = "Previous Page";
YAHOO.ext.grid.PagedGridView.prototype.nextText = "Next Page";
YAHOO.ext.grid.PagedGridView.prototype.lastText = "Last Page";
YAHOO.ext.grid.PagedGridView.prototype.refreshText = "Refresh";