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94 lines
3.7 KiB
94 lines
3.7 KiB
var _ = require('underscore');
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var ko = require('knockout');
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var dispose = require('../lib/dispose');
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var BaseRowModel = require('./BaseRowModel');
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var modelUtil = require('./modelUtil');
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var BackboneEvents = require('backbone').Events;
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/**
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* MetaRowModel is a RowModel for built-in (Meta) tables. It takes a list of field names, and an
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* additional constructor called with (docModel, tableModel) arguments (and `this` context), which
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* can add arbitrary additional properties to this RowModel.
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*/
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function MetaRowModel(tableModel, fieldNames, rowConstructor, rowId) {
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var colNames = ['id'].concat(fieldNames);
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BaseRowModel.call(this, tableModel, colNames);
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this._rowId = rowId;
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// MetaTableModel#_createRowModelItem creates lightweight objects that all reference the same MetaRowModel but are slightly different.
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// We don't derive from BackboneEvents directly so that the lightweight objects created share the same Events object even though they are distinct.
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this.events = this.autoDisposeWith('stopListening', BackboneEvents);
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// Changes to true when this row gets deleted. This also likely means that this model is about
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// to get disposed, except for a floating row model.
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this._isDeleted = ko.observable(false);
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// Populate all fields. Note that MetaRowModels are never get reassigned after construction.
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this._fields.forEach(function(colName) {
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this._assignColumn(colName);
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}, this);
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// Customize the MetaRowModel with a custom additional constructor.
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if (rowConstructor) {
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rowConstructor.call(this, tableModel.docModel, tableModel);
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}
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}
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dispose.makeDisposable(MetaRowModel);
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_.extend(MetaRowModel.prototype, BaseRowModel.prototype);
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MetaRowModel.prototype._assignColumn = function(colName) {
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if (this.hasOwnProperty(colName)) {
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this[colName].assign(this._table.tableData.getValue(this._rowId, colName));
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}
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};
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//----------------------------------------------------------------------
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/**
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* MetaRowModel.Floater is an object designed to look like a MetaRowModel. It contains observables
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* that mirror some particular MetaRowModel. The MetaRowModel currently being mirrored is the one
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* corresponding to the value of `rowIdObs`.
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*
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* Mirrored fields are computed observables that support reading, writing, and saving.
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*/
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MetaRowModel.Floater = function(tableModel, rowIdObs) {
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this._table = tableModel;
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this.rowIdObs = rowIdObs;
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// Some tsc error prevents me from adding this at the module level.
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// This method is part of the interface of MetaRowModel.
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// TODO: Fix the tsc error and move this to the module level.
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if (!this.constructor.prototype.getRowId) {
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this.constructor.prototype.getRowId = function() {
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return this.rowIdObs();
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}
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}
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// Note that ._index isn't supported because it doesn't make sense for a floating row model.
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this._underlyingRowModel = this.autoDispose(ko.computed(function() {
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return tableModel.getRowModel(rowIdObs());
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}));
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_.each(this._underlyingRowModel(), function(propValue, propName) {
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if (ko.isObservable(propValue)) {
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// Forward read/write calls to the observable on the currently-active underlying model.
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this[propName] = this.autoDispose(ko.pureComputed({
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owner: this,
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read: function() { return this._underlyingRowModel()[propName](); },
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write: function(val) { this._underlyingRowModel()[propName](val); }
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}));
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// If the underlying observable supports saving, forward save calls too.
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if (propValue.saveOnly) {
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modelUtil.addSaveInterface(this[propName], (value =>
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this._underlyingRowModel()[propName].saveOnly(value)));
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}
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}
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}, this);
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};
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dispose.makeDisposable(MetaRowModel.Floater);
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module.exports = MetaRowModel;
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