Ext.ns('Ext.ux.form');

/**
 * @class Ext.ux.form.SelectBox
 * @extends Ext.form.ComboBox
 * 
Makes a ComboBox more closely mimic an HTML SELECT.  Supports clicking and dragging
 * through the list, with item selection occurring when the mouse button is released.
 * When used will automatically set {@link #editable} to false and call {@link Ext.Element#unselectable}
 * on inner elements.  Re-enabling editable after calling this will NOT work.
 * @author Corey Gilmore http://extjs.com/forum/showthread.php?t=6392
 * @history 2007-07-08 jvs
 * Slight mods for Ext 2.0
 * @xtype selectbox
 */
Ext.ux.form.SelectBox = Ext.extend(Ext.form.ComboBox, {
    constructor: function(config){
        this.searchResetDelay = 1000;
        config = config || {};
        config = Ext.apply(config || {}, {
            editable: false,
            forceSelection: true,
            rowHeight: false,
            lastSearchTerm: false,
            triggerAction: 'all',
            mode: 'local'
        });

        Ext.ux.form.SelectBox.superclass.constructor.apply(this, arguments);

        this.lastSelectedIndex = this.selectedIndex || 0;
    },

    initEvents : function(){
        Ext.ux.form.SelectBox.superclass.initEvents.apply(this, arguments);
        // you need to use keypress to capture upper/lower case and shift+key, but it doesn't work in IE
        this.el.on('keydown', this.keySearch, this, true);
        this.cshTask = new Ext.util.DelayedTask(this.clearSearchHistory, this);
    },

    keySearch : function(e, target, options) {
        var raw = e.getKey();
        var key = String.fromCharCode(raw);
        var startIndex = 0;

        if( !this.store.getCount() ) {
            return;
        }

        switch(raw) {
            case Ext.EventObject.HOME:
                e.stopEvent();
                this.selectFirst();
                return;

            case Ext.EventObject.END:
                e.stopEvent();
                this.selectLast();
                return;

            case Ext.EventObject.PAGEDOWN:
                this.selectNextPage();
                e.stopEvent();
                return;

            case Ext.EventObject.PAGEUP:
                this.selectPrevPage();
                e.stopEvent();
                return;
        }

        // skip special keys other than the shift key
        if( (e.hasModifier() && !e.shiftKey) || e.isNavKeyPress() || e.isSpecialKey() ) {
            return;
        }
        if( this.lastSearchTerm == key ) {
            startIndex = this.lastSelectedIndex;
        }
        this.search(this.displayField, key, startIndex);
        this.cshTask.delay(this.searchResetDelay);
    },

    onRender : function(ct, position) {
        this.store.on('load', this.calcRowsPerPage, this);
        Ext.ux.form.SelectBox.superclass.onRender.apply(this, arguments);
        if( this.mode == 'local' ) {
            this.initList();
            this.calcRowsPerPage();
        }
    },

    onSelect : function(record, index, skipCollapse){
        if(this.fireEvent('beforeselect', this, record, index) !== false){
            this.setValue(record.data[this.valueField || this.displayField]);
            if( !skipCollapse ) {
                this.collapse();
            }
            this.lastSelectedIndex = index + 1;
            this.fireEvent('select', this, record, index);
        }
    },

    afterRender : function() {
        Ext.ux.form.SelectBox.superclass.afterRender.apply(this, arguments);
        if(Ext.isWebKit) {
            this.el.swallowEvent('mousedown', true);
        }
        this.el.unselectable();
        this.innerList.unselectable();
        this.trigger.unselectable();
        this.innerList.on('mouseup', function(e, target, options) {
            if( target.id && target.id == this.innerList.id ) {
                return;
            }
            this.onViewClick();
        }, this);

        this.innerList.on('mouseover', function(e, target, options) {
            if( target.id && target.id == this.innerList.id ) {
                return;
            }
            this.lastSelectedIndex = this.view.getSelectedIndexes()[0] + 1;
            this.cshTask.delay(this.searchResetDelay);
        }, this);

        this.trigger.un('click', this.onTriggerClick, this);
        this.trigger.on('mousedown', function(e, target, options) {
            e.preventDefault();
            this.onTriggerClick();
        }, this);

        this.on('collapse', function(e, target, options) {
            Ext.getDoc().un('mouseup', this.collapseIf, this);
        }, this, true);

        this.on('expand', function(e, target, options) {
            Ext.getDoc().on('mouseup', this.collapseIf, this);
        }, this, true);
    },

    clearSearchHistory : function() {
        this.lastSelectedIndex = 0;
        this.lastSearchTerm = false;
    },

    selectFirst : function() {
        this.focusAndSelect(this.store.data.first());
    },

    selectLast : function() {
        this.focusAndSelect(this.store.data.last());
    },

    selectPrevPage : function() {
        if( !this.rowHeight ) {
            return;
        }
        var index = Math.max(this.selectedIndex-this.rowsPerPage, 0);
        this.focusAndSelect(this.store.getAt(index));
    },

    selectNextPage : function() {
        if( !this.rowHeight ) {
            return;
        }
        var index = Math.min(this.selectedIndex+this.rowsPerPage, this.store.getCount() - 1);
        this.focusAndSelect(this.store.getAt(index));
    },

    search : function(field, value, startIndex) {
        field = field || this.displayField;
        this.lastSearchTerm = value;
        var index = this.store.find.apply(this.store, arguments);
        if( index !== -1 ) {
            this.focusAndSelect(index);
        }
    },

    focusAndSelect : function(record) {
        var index = Ext.isNumber(record) ? record : this.store.indexOf(record);
        this.select(index, this.isExpanded());
        this.onSelect(this.store.getAt(index), index, this.isExpanded());
    },

    calcRowsPerPage : function() {
        if( this.store.getCount() ) {
            this.rowHeight = Ext.fly(this.view.getNode(0)).getHeight();
            this.rowsPerPage = this.maxHeight / this.rowHeight;
        } else {
            this.rowHeight = false;
        }
    }

});

Ext.reg('selectbox', Ext.ux.form.SelectBox);

//backwards compat
Ext.ux.SelectBox = Ext.ux.form.SelectBox;