gristlabs_grist-core/app/client/widgets/AttachmentsWidget.ts

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import {Computed, dom, fromKo, input, makeTestId, onElem, styled, TestId} from 'grainjs';
import * as commands from 'app/client/components/commands';
import {dragOverClass} from 'app/client/lib/dom';
import {selectFiles, uploadFiles} from 'app/client/lib/uploads';
import {cssRow} from 'app/client/ui/RightPanel';
import {colors, vars} from 'app/client/ui2018/cssVars';
import {NewAbstractWidget} from 'app/client/widgets/NewAbstractWidget';
import {encodeQueryParams} from 'app/common/gutil';
import {MetaTableData} from 'app/client/models/TableData';
import {UploadResult} from 'app/common/uploads';
import {extname} from 'path';
const testId: TestId = makeTestId('test-pw-');
const attachmentWidget = styled('div.attachment_widget.field_clip', `
display: flex;
flex-wrap: wrap;
white-space: pre-wrap;
`);
const attachmentIcon = styled('div.attachment_icon.glyphicon.glyphicon-paperclip', `
position: absolute;
top: 2px;
left: 2px;
padding: 2px;
background-color: #D0D0D0;
color: white;
border-radius: 2px;
border: none;
cursor: pointer;
box-shadow: 0 0 0 1px white;
z-index: 1;
&:hover {
background-color: #3290BF;
}
`);
const attachmentPreview = styled('div', `
color: black;
background-color: white;
border: 1px solid #bbb;
margin: 0 2px 2px 0;
position: relative;
display: flex;
align-items: center;
justify-content: center;
z-index: 0;
&:hover {
border-color: ${colors.lightGreen};
}
`);
const sizeLabel = styled('div', `
color: ${colors.slate};
margin-right: 9px;
`);
export interface SavingObservable<T> extends ko.Observable<T> {
setAndSave(value: T): void;
}
/**
* AttachmentsWidget - A widget for displaying attachments as image previews.
*/
export class AttachmentsWidget extends NewAbstractWidget {
private _attachmentsTable: MetaTableData<'_grist_Attachments'>;
private _height: SavingObservable<string>;
constructor(field: any) {
super(field);
// TODO: the Attachments table currently treated as metadata, and loaded on open,
// but should probably be loaded on demand as it contains user data, which may be large.
this._attachmentsTable = this._getDocData().getMetaTable('_grist_Attachments');
this._height = this.options.prop('height') as SavingObservable<string>;
this.autoDispose(this._height.subscribe(() => {
this.field.viewSection().events.trigger('rowHeightChange');
}));
}
public buildDom(_row: any): Element {
// NOTE: A cellValue of the correct type includes the list encoding designator 'L' as the
// first element.
const cellValue: SavingObservable<number[]> = _row[this.field.colId()];
const values = Computed.create(null, fromKo(cellValue), (use, _cellValue) =>
Array.isArray(_cellValue) ? _cellValue.slice(1) : []);
return attachmentWidget(
dom.autoDispose(values),
dragOverClass('attachment_drag_over'),
attachmentIcon(
dom.cls('attachment_hover_icon', (use) => use(values).length > 0),
dom.on('click', () => this._selectAndSave(cellValue))
),
dom.forEach(values, (value: number) =>
isNaN(value) ? null : this._buildAttachment(value, values)
),
dom.on('drop', ev => this._uploadAndSave(cellValue, ev.dataTransfer!.files))
);
}
public buildConfigDom(): Element {
const inputRange = input(fromKo(this._height), {onInput: true}, {
style: 'margin: 0 5px;',
type: 'range',
min: '16',
max: '96',
value: '36'
}, testId('thumbnail-size'));
// Save the height on change event (when the user releases the drag button)
onElem(inputRange, 'change', (ev: any) => { this._height.setAndSave(ev.target.value); });
return cssRow(
sizeLabel('Size'),
inputRange
);
}
protected _buildAttachment(value: number, allValues: Computed<number[]>): Element {
const filename = this._attachmentsTable.getValue(value, 'fileName')!;
const fileIdent = this._attachmentsTable.getValue(value, 'fileIdent')!;
const height = this._attachmentsTable.getValue(value, 'imageHeight')!;
const width = this._attachmentsTable.getValue(value, 'imageWidth')!;
const hasPreview = Boolean(height);
const ratio = hasPreview ? (width / height) : 1;
return attachmentPreview({title: filename}, // Add a filename tooltip to the previews.
dom.style('height', (use) => `${use(this._height)}px`),
dom.style('width', (use) => `${parseInt(use(this._height), 10) * ratio}px`),
// TODO: Update to legitimately determine whether a file preview exists.
hasPreview ? dom('img', {style: 'height: 100%; min-width: 100%; vertical-align: top;'},
dom.attr('src', this._getUrl(value))
) : renderFileType(filename, fileIdent, this._height),
// Open editor as if with input, using it to tell it which of the attachments to show. We
// pass in a 1-based index. Hitting a key opens the cell, and this approach allows an
// accidental feature of opening e.g. second attachment by hitting "2".
dom.on('dblclick', () => commands.allCommands.input.run(String(allValues.get().indexOf(value) + 1))),
testId('thumbnail'),
);
}
// Returns the attachment download url.
private _getUrl(rowId: number): string {
const ident = this._attachmentsTable.getValue(rowId, 'fileIdent');
if (!ident) {
return '';
} else {
const docComm = this._getDocComm();
return docComm.docUrl('attachment') + '?' + encodeQueryParams({
...docComm.getUrlParams(),
ident,
name: this._attachmentsTable.getValue(rowId, 'fileName')
});
}
}
private async _selectAndSave(value: SavingObservable<number[]>): Promise<void> {
const uploadResult = await selectFiles({docWorkerUrl: this._getDocComm().docWorkerUrl,
multiple: true, sizeLimit: 'attachment'});
return this._save(value, uploadResult);
}
private async _uploadAndSave(value: SavingObservable<number[]>, files: FileList): Promise<void> {
const uploadResult = await uploadFiles(Array.from(files),
{docWorkerUrl: this._getDocComm().docWorkerUrl,
sizeLimit: 'attachment'});
return this._save(value, uploadResult);
}
private async _save(value: SavingObservable<number[]>, uploadResult: UploadResult|null): Promise<void> {
if (!uploadResult) { return; }
const rowIds = await this._getDocComm().addAttachments(uploadResult.uploadId);
// Values should be saved with a leading "L" to fit Grist's list value encoding.
const formatted: any[] = value() ? value() : ["L"];
value.setAndSave(formatted.concat(rowIds));
// Trigger a row height change in case the added attachment wraps to the next line.
this.field.viewSection().events.trigger('rowHeightChange');
}
}
export function renderFileType(fileName: string, fileIdent: string, height?: ko.Observable<string>): HTMLElement {
// Prepend 'x' to ensure we return the extension even if the basename is empty (e.g. ".xls").
// Take slice(1) to strip off the leading period.
const extension = extname('x' + fileName).slice(1) || extname('x' + fileIdent).slice(1) || '?';
return cssFileType(extension.toUpperCase(),
height && cssFileType.cls((use) => {
const size = parseFloat(use(height));
return size < 28 ? '-small' : size < 60 ? '-medium' : '-large';
}),
);
}
const cssFileType = styled('div', `
height: 100%;
width: 100%;
max-height: 80px;
max-width: 80px;
background-color: ${colors.slate};
display: flex;
align-items: center;
justify-content: center;
font-size: ${vars.mediumFontSize};
font-weight: bold;
color: white;
overflow: hidden;
&-small { font-size: ${vars.xxsmallFontSize}; }
&-medium { font-size: ${vars.smallFontSize}; }
&-large { font-size: ${vars.mediumFontSize}; }
`);