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/**
* StackLayouts contain a series of {@link OO.ui.PanelLayout panel layouts}. By default, only one panel is displayed
* at a time, though the stack layout can also be configured to show all contained panels, one after another,
* by setting the #continuous option to 'true'.
*
* @example
* // A stack layout with two panels, configured to be displayed continously
* var myStack = new OO.ui.StackLayout( {
* items: [
* new OO.ui.PanelLayout( {
* $content: $( '<p>Panel One</p>' ),
* padded: true,
* framed: true
* } ),
* new OO.ui.PanelLayout( {
* $content: $( '<p>Panel Two</p>' ),
* padded: true,
* framed: true
* } )
* ],
* continuous: true
* } );
* $( 'body' ).append( myStack.$element );
*
* @class
* @extends OO.ui.PanelLayout
* @mixins OO.ui.GroupElement
*
* @constructor
* @param {Object} [config] Configuration options
* @cfg {boolean} [continuous=false] Show all panels, one after another. By default, only one panel is displayed at a time.
* @cfg {OO.ui.Layout[]} [items] Panel layouts to add to the stack layout.
*/
OO.ui.StackLayout = function OoUiStackLayout( config ) {
// Configuration initialization
config = $.extend( { scrollable: true }, config );
// Parent constructor
OO.ui.StackLayout.super.call( this, config );
// Mixin constructors
OO.ui.GroupElement.call( this, $.extend( {}, config, { $group: this.$element } ) );
// Properties
this.currentItem = null;
this.continuous = !!config.continuous;
// Initialization
this.$element.addClass( 'oo-ui-stackLayout' );
if ( this.continuous ) {
this.$element.addClass( 'oo-ui-stackLayout-continuous' );
}
if ( Array.isArray( config.items ) ) {
this.addItems( config.items );
}
};
/* Setup */
OO.inheritClass( OO.ui.StackLayout, OO.ui.PanelLayout );
OO.mixinClass( OO.ui.StackLayout, OO.ui.GroupElement );
/* Events */
/**
* A 'set' event is emitted when panels are {@link #addItems added}, {@link #removeItems removed},
* {@link #clearItems cleared} or {@link #setItem displayed}.
*
* @event set
* @param {OO.ui.Layout|null} item Current panel or `null` if no panel is shown
*/
/* Methods */
/**
* Get the current panel.
*
* @return {OO.ui.Layout|null}
*/
OO.ui.StackLayout.prototype.getCurrentItem = function () {
return this.currentItem;
};
/**
* Unset the current item.
*
* @private
* @param {OO.ui.StackLayout} layout
* @fires set
*/
OO.ui.StackLayout.prototype.unsetCurrentItem = function () {
var prevItem = this.currentItem;
if ( prevItem === null ) {
return;
}
this.currentItem = null;
this.emit( 'set', null );
};
/**
* Add panel layouts to the stack layout.
*
* Panels will be added to the end of the stack layout array unless the optional index parameter specifies a different
* insertion point. Adding a panel that is already in the stack will move it to the end of the array or the point specified
* by the index.
*
* @param {OO.ui.Layout[]} items Panels to add
* @param {number} [index] Index of the insertion point
* @chainable
*/
OO.ui.StackLayout.prototype.addItems = function ( items, index ) {
// Update the visibility
this.updateHiddenState( items, this.currentItem );
// Mixin method
OO.ui.GroupElement.prototype.addItems.call( this, items, index );
if ( !this.currentItem && items.length ) {
this.setItem( items[ 0 ] );
}
return this;
};
/**
* Remove the specified panels from the stack layout.
*
* Removed panels are detached from the DOM, not removed, so that they may be reused. To remove all panels,
* you may wish to use the #clearItems method instead.
*
* @param {OO.ui.Layout[]} items Panels to remove
* @chainable
* @fires set
*/
OO.ui.StackLayout.prototype.removeItems = function ( items ) {
// Mixin method
OO.ui.GroupElement.prototype.removeItems.call( this, items );
if ( $.inArray( this.currentItem, items ) !== -1 ) {
if ( this.items.length ) {
this.setItem( this.items[ 0 ] );
} else {
this.unsetCurrentItem();
}
}
return this;
};
/**
* Clear all panels from the stack layout.
*
* Cleared panels are detached from the DOM, not removed, so that they may be reused. To remove only
* a subset of panels, use the #removeItems method.
*
* @chainable
* @fires set
*/
OO.ui.StackLayout.prototype.clearItems = function () {
this.unsetCurrentItem();
OO.ui.GroupElement.prototype.clearItems.call( this );
return this;
};
/**
* Show the specified panel.
*
* If another panel is currently displayed, it will be hidden.
*
* @param {OO.ui.Layout} item Panel to show
* @chainable
* @fires set
*/
OO.ui.StackLayout.prototype.setItem = function ( item ) {
if ( item !== this.currentItem ) {
this.updateHiddenState( this.items, item );
if ( $.inArray( item, this.items ) !== -1 ) {
this.currentItem = item;
this.emit( 'set', item );
} else {
this.unsetCurrentItem();
}
}
return this;
};
/**
* Update the visibility of all items in case of non-continuous view.
*
* Ensure all items are hidden except for the selected one.
* This method does nothing when the stack is continuous.
*
* @private
* @param {OO.ui.Layout[]} items Item list iterate over
* @param {OO.ui.Layout} [selectedItem] Selected item to show
*/
OO.ui.StackLayout.prototype.updateHiddenState = function ( items, selectedItem ) {
var i, len;
if ( !this.continuous ) {
for ( i = 0, len = items.length; i < len; i++ ) {
if ( !selectedItem || selectedItem !== items[ i ] ) {
items[ i ].$element.addClass( 'oo-ui-element-hidden' );
}
}
if ( selectedItem ) {
selectedItem.$element.removeClass( 'oo-ui-element-hidden' );
}
}
};
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