import * as BaseView from 'app/client/components/BaseView';
import {Cursor} from 'app/client/components/Cursor';
import * as commands from 'app/client/components/commands';
import {GristDoc} from 'app/client/components/GristDoc';
import {ConfigNotifier, CustomSectionAPIImpl, GristDocAPIImpl, GristViewImpl,
MinimumLevel, RecordNotifier, TableNotifier, WidgetAPIImpl,
WidgetFrame} from 'app/client/components/WidgetFrame';
import {CustomSectionElement, ViewProcess} from 'app/client/lib/CustomSectionElement';
import {Disposable} from 'app/client/lib/dispose';
import * as dom from 'app/client/lib/dom';
import * as kd from 'app/client/lib/koDom';
import * as DataTableModel from 'app/client/models/DataTableModel';
import {ViewSectionRec} from 'app/client/models/DocModel';
import {CustomViewSectionDef} from 'app/client/models/entities/ViewSectionRec';
import {UserError} from 'app/client/models/errors';
import {SortedRowSet} from 'app/client/models/rowset';
import {PluginInstance} from 'app/common/PluginInstance';
import {AccessLevel} from 'app/common/CustomWidget';
import {closeRegisteredMenu} from 'app/client/ui2018/menus';
import {getGristConfig} from 'app/common/urlUtils';
import {Events as BackboneEvents} from 'backbone';
import {dom as grains} from 'grainjs';
import * as ko from 'knockout';
import defaults = require('lodash/defaults');
/**
* CustomView components displays arbitrary html. There are two modes available, in the "url" mode
* the content is hosted by a third-party (for instance a github page), as opposed to the "plugin"
* mode where the contents is provided by a plugin. In both cases the content is rendered safely
* within an iframe (or webview if running electron). Configuration of the component is done within
* the view config tab in the side pane. In "plugin" mode, shows notification if either the plugin
* of the section could not be found.
*/
export class CustomView extends Disposable {
private static _commands = {
async openWidgetConfiguration(this: CustomView) {
if (!this.isDisposed() && !this._frame?.isDisposed()) {
try {
await this._frame.editOptions();
} catch(err) {
if (err.message === "Unknown interface") {
throw new UserError("Custom widget doesn't expose configuration screen.");
} else {
throw err;
}
}
}
},
};
/**
* The HTMLElement embedding the content.
*/
public viewPane: HTMLElement;
// viewSection, sortedRows, tableModel, gristDoc, and cursor are inherited from BaseView
protected viewSection: ViewSectionRec;
protected sortedRows: SortedRowSet;
protected tableModel: DataTableModel;
protected gristDoc: GristDoc;
protected cursor: Cursor;
private _customDef: CustomViewSectionDef;
// state of the component
private _foundPlugin: ko.Observable<boolean>;
private _foundSection: ko.Observable<boolean>;
// Note the invariant: this._customSection != undefined if this._foundSection() == true
private _customSection: ViewProcess|undefined;
private _pluginInstance: PluginInstance|undefined;
private _frame: WidgetFrame; // plugin frame (holding external page)
private _emptyWidgetPage: string;
public create(gristDoc: GristDoc, viewSectionModel: ViewSectionRec) {
BaseView.call(this as any, gristDoc, viewSectionModel, { 'addNewRow': true });
this._customDef = this.viewSection.customDef;
this._emptyWidgetPage = new URL("custom-widget.html", getGristConfig().homeUrl!).href;
this.autoDisposeCallback(() => {
if (this._customSection) {
this._customSection.dispose();
}
});
this._foundPlugin = ko.observable(false);
this._foundSection = ko.observable(false);
// Ensure that selecting another section in same plugin update the view.
this._foundSection.extend({notify: 'always'});
this.autoDispose(this._customDef.pluginId.subscribe(this._updatePluginInstance, this));
this.autoDispose(this._customDef.sectionId.subscribe(this._updateCustomSection, this));
this.autoDispose(commands.createGroup(CustomView._commands, this, this.viewSection.hasFocus));
this.viewPane = this.autoDispose(this._buildDom());
this._updatePluginInstance();
}
public async triggerPrint() {
if (!this.isDisposed() && this._frame) {
return await this._frame.callRemote('print');
}
}
/**
* Find a plugin instance that matches the plugin id, update the `found` observables, then tries to
* find a matching section.
*/
private _updatePluginInstance() {
const pluginId = this._customDef.pluginId();
this._pluginInstance = this.gristDoc.docPluginManager.pluginsList.find(p => p.definition.id === pluginId);
if (this._pluginInstance) {
this._foundPlugin(true);
} else {
this._foundPlugin(false);
this._foundSection(false);
}
this._updateCustomSection();
}
/**
* If a plugin was found, find a custom section matching the section id and update the `found`
* observables.
*/
private _updateCustomSection() {
if (!this._pluginInstance) { return; }
const sectionId = this._customDef.sectionId();
this._customSection = CustomSectionElement.find(this._pluginInstance, sectionId);
if (this._customSection) {
const el = this._customSection.element;
el.classList.add("flexitem");
this._foundSection(true);
} else {
this._foundSection(false);
}
}
private _buildDom() {
const {mode, url, access} = this._customDef;
const showPlugin = ko.pureComputed(() => this._customDef.mode() === "plugin");
// When both plugin and section are not found, let's show only plugin notification.
const showPluginNotification = ko.pureComputed(() => showPlugin() && !this._foundPlugin());
const showSectionNotification = ko.pureComputed(() => showPlugin() && this._foundPlugin() && !this._foundSection());
const showPluginContent = ko.pureComputed(() => showPlugin() && this._foundSection())
// For the view to update when switching from one section to another one, the computed
// observable must always notify.
.extend({notify: 'always'});
return dom('div.flexauto.flexvbox.custom_view_container',
dom.autoDispose(showPlugin),
dom.autoDispose(showPluginNotification),
dom.autoDispose(showSectionNotification),
dom.autoDispose(showPluginContent),
// todo: should display content in webview when running electron
kd.scope(() => [mode(), url(), access()], ([_mode, _url, _access]: string[]) =>
_mode === "url" ? this._buildIFrame(_url, (_access || AccessLevel.none) as AccessLevel) : null),
kd.maybe(showPluginNotification, () => buildNotification('Plugin ',
dom('strong', kd.text(this._customDef.pluginId)), ' was not found',
dom.testId('customView_notification_plugin')
)),
kd.maybe(showSectionNotification, () => buildNotification('Section ',
dom('strong', kd.text(this._customDef.sectionId)), ' was not found in plugin ',
dom('strong', kd.text(this._customDef.pluginId)),
dom.testId('customView_notification_section')
)),
// When showPluginContent() is true then _foundSection() is also and _customSection is not
// undefined (invariant).
kd.maybe(showPluginContent, () => this._customSection!.element)
);
}
private _promptAccess(access: AccessLevel) {
if (this.gristDoc.isReadonly.get()) {
return;
}
this.viewSection.desiredAccessLevel(access);
}
private _buildIFrame(baseUrl: string, access: AccessLevel) {
return grains.create(WidgetFrame, {
url: baseUrl || this._emptyWidgetPage,
access,
readonly: this.gristDoc.isReadonly.get(),
configure: (frame) => {
this._frame = frame;
// Need to cast myself to a BaseView
const view = this as unknown as BaseView;
frame.exposeAPI(
"GristDocAPI",
new GristDocAPIImpl(this.gristDoc),
GristDocAPIImpl.defaultAccess);
frame.exposeAPI(
"GristView",
new GristViewImpl(view), new MinimumLevel(AccessLevel.read_table));
frame.exposeAPI(
"CustomSectionAPI",
new CustomSectionAPIImpl(
this.viewSection,
access,
this._promptAccess.bind(this)),
new MinimumLevel(AccessLevel.none));
frame.useEvents(RecordNotifier.create(frame, view), new MinimumLevel(AccessLevel.read_table));
frame.useEvents(TableNotifier.create(frame, view), new MinimumLevel(AccessLevel.read_table));
frame.exposeAPI(
"WidgetAPI",
new WidgetAPIImpl(this.viewSection),
new MinimumLevel(AccessLevel.none)); // none access is enough
frame.useEvents(
ConfigNotifier.create(frame, this.viewSection, access),
new MinimumLevel(AccessLevel.none)); // none access is enough
},
onElem: (iframe) => onFrameFocus(iframe, () => {
if (this.isDisposed()) { return; }
if (!this.viewSection.isDisposed() && !this.viewSection.hasFocus()) {
this.viewSection.hasFocus(true);
}
// allow menus to close if any
closeRegisteredMenu();
})
});
}
}
// Getting an ES6 class to work with old-style multiple base classes takes a little hacking. Credits: ./ChartView.ts
defaults(CustomView.prototype, BaseView.prototype);
Object.assign(CustomView.prototype, BackboneEvents);
// helper to build the notification's frame.
function buildNotification(...args: any[]) {
return dom('div.custom_view_notification.bg-warning', dom('p', ...args));
}
/**
* There is no way to detect if the frame was clicked. This causes a bug, when
* there are 2 custom widgets on a page then user can't switch focus from 1 section
* to another. The only solution is too pool and test if the iframe is an active element
* in the dom.
* (See https://stackoverflow.com/questions/2381336/detect-click-into-iframe-using-javascript).
*
* For a single iframe, it will gain focus through a hack in ViewLayout.ts.
*/
function onFrameFocus(frame: HTMLIFrameElement, handler: () => void) {
let timer: NodeJS.Timeout|null = null;
// Flag that will prevent mouseenter event to be fired
// after dom is disposed. This shouldn't happen.
let disposed = false;
// Stops pooling.
function stop() {
if (timer) {
clearInterval(timer);
timer = null;
}
}
return grains.update(frame,
grains.on("mouseenter", () => {
// Make sure we weren't dispose (should not happen)
if (disposed) { return; }
// If frame already has focus, do nothing.
// NOTE: Frame will always be an active element from our perspective,
// even if the focus is somewhere inside the iframe.
if (document.activeElement === frame) { return; }
// Start pooling for frame focus.
timer = setInterval(() => {
if (document.activeElement === frame) {
try {
handler();
} finally {
// Stop checking, we will start again after next mouseenter.
stop();
}
}
}, 70); // 70 is enough to make it look like a click.
}),
grains.on("mouseleave", stop),
grains.onDispose(() => {
stop();
disposed = true;
})
);
}