gristlabs_grist-core/app/client/components/Clipboard.js

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/**
* Clipboard component manages the copy/cut/paste events by capturing these events from the browser,
* managing their state, and exposing an API to other components to get/set the data.
*
* Because of a lack of standardization of ClipboardEvents between browsers, the way Clipboard
* captures the events is by creating a hidden textarea element that's always focused with some text
* selected. Here is a good write-up of this:
* https://www.lucidchart.com/techblog/2014/12/02/definitive-guide-copying-pasting-javascript/
*
* When ClipboardEvent is detected, Clipboard captures the event and calls the corresponding
* copy/cut/paste/input command actions, which will get called on the appropriate component.
*
* Usage:
* Components need to register copy/cut/paste actions with command.js:
* .copy() should return @pasteObj (defined below).
* .paste(plainText, [cutSelection]) should take a plainText value and an optional cutSelection
* parameter which will specify the selection that should be cleared as part of paste.
* .input(char) should take a single input character and will be called when the user types a
* visible character (useful if component wants to interpret typing into a cell, for example).
*/
/**
* Paste object that should be returned by implementation of `copy`.
*
* @typedef pasteObj {{
* docName: string,
* tableId: string,
* data: object,
* selection: object
* }}
*/
/* global window, document */
var {getHumanKey, isMac} = require('app/client/components/commands');
var {copyToClipboard, readDataFromClipboard} = require('app/client/lib/clipboardUtils');
var {FocusLayer} = require('app/client/lib/FocusLayer');
var {makeT} = require('app/client/lib/localization');
var {tsvDecode} = require('app/common/tsvFormat');
var {ShortcutKey, ShortcutKeyContent} = require('app/client/ui/ShortcutKey');
var {confirmModal} = require('app/client/ui2018/modals');
var {styled} = require('grainjs');
var commands = require('./commands');
var dom = require('../lib/dom');
var Base = require('./Base');
var tableUtil = require('../lib/tableUtil');
const t = makeT('Clipboard');
function Clipboard(app) {
Base.call(this, null);
this._app = app;
this.copypasteField = this.autoDispose(dom('textarea.copypaste.mousetrap', ''));
this.timeoutId = null;
this.onEvent(this.copypasteField, 'input', function(elem, event) {
var value = elem.value;
elem.value = '';
commands.allCommands.input.run(value);
return false;
});
this.onEvent(this.copypasteField, 'copy', this._onCopy);
this.onEvent(this.copypasteField, 'cut', this._onCut);
this.onEvent(this.copypasteField, 'paste', this._onPaste);
document.body.appendChild(this.copypasteField);
FocusLayer.create(this, {
defaultFocusElem: this.copypasteField,
allowFocus: allowFocus,
onDefaultFocus: () => {
this.copypasteField.value = ' ';
this.copypasteField.select();
this._app.trigger('clipboard_focus');
},
onDefaultBlur: () => {
this._app.trigger('clipboard_blur');
},
});
// Expose the grabber as a global to allow upload from tests to explicitly restore focus
window.gristClipboardGrabFocus = () => FocusLayer.grabFocus();
// Some bugs may prevent Clipboard from re-grabbing focus. To limit the impact of such bugs on
// the user, recover from a bad state in mousedown events. (At the moment of this comment, all
// such known bugs are fixed.)
this.onEvent(window, 'mousedown', (ev) => {
if (!document.activeElement || document.activeElement === document.body) {
FocusLayer.grabFocus();
}
});
// In the event of a cut a callback is provided by the viewsection that is the target of the cut.
// When called it returns the additional removal action needed for a cut.
this._cutCallback = null;
// The plaintext content of the cut callback. Used to verify that we are pasting the results
// of the cut, rather than new data from outside.
this._cutData = null;
this.autoDispose(commands.createGroup(Clipboard.commands, this, true));
}
Base.setBaseFor(Clipboard);
Clipboard.commands = {
contextMenuCopy: function() { this._doContextMenuCopy(); },
contextMenuCut: function() { this._doContextMenuCut(); },
contextMenuPaste: function() { this._doContextMenuPaste(); },
};
/**
* Internal helper fired on `copy` events. If a callback was registered from a component, calls the
* callback to get selection data and puts it on the clipboard.
*/
Clipboard.prototype._onCopy = function(elem, event) {
event.preventDefault();
let pasteObj = commands.allCommands.copy.run();
this._setCBdata(pasteObj, event.originalEvent.clipboardData);
};
Clipboard.prototype._doContextMenuCopy = function() {
let pasteObj = commands.allCommands.copy.run();
this._copyToClipboard(pasteObj, 'copy');
};
Clipboard.prototype._onCut = function(elem, event) {
event.preventDefault();
let pasteObj = commands.allCommands.cut.run();
this._setCBdata(pasteObj, event.originalEvent.clipboardData);
};
Clipboard.prototype._doContextMenuCut = function() {
let pasteObj = commands.allCommands.cut.run();
this._copyToClipboard(pasteObj, 'cut');
};
Clipboard.prototype._setCBdata = function(pasteObj, clipboardData) {
if (!pasteObj) { return; }
const plainText = tableUtil.makePasteText(pasteObj.data, pasteObj.selection);
clipboardData.setData('text/plain', plainText);
const htmlText = tableUtil.makePasteHtml(pasteObj.data, pasteObj.selection);
clipboardData.setData('text/html', htmlText);
this._setCutCallback(pasteObj, plainText);
};
Clipboard.prototype._copyToClipboard = async function(pasteObj, action) {
if (!pasteObj) { return; }
const plainText = tableUtil.makePasteText(pasteObj.data, pasteObj.selection);
let data;
if (typeof ClipboardItem === 'function') {
const htmlText = tableUtil.makePasteHtml(pasteObj.data, pasteObj.selection);
// eslint-disable-next-line no-undef
data = new ClipboardItem({
// eslint-disable-next-line no-undef
'text/plain': new Blob([plainText], {type: 'text/plain'}),
// eslint-disable-next-line no-undef
'text/html': new Blob([htmlText], {type: 'text/html'}),
});
} else {
data = plainText;
}
try {
await copyToClipboard(data);
} catch {
showUnavailableMenuCommandModal(action);
return;
}
this._setCutCallback(pasteObj, plainText);
};
/**
* Sets the cut callback from the `pasteObj` if one exists. Otherwise clears the
* cut callback.
*
* The callback is called on paste, and only if the pasted data matches the `cutData`
* that was cut from within Grist. The callback handles removal of the data that was
* cut.
*/
Clipboard.prototype._setCutCallback = function(pasteObj, cutData) {
if (pasteObj.cutCallback) {
this._cutCallback = pasteObj.cutCallback;
this._cutData = cutData;
} else {
this._cutCallback = null;
this._cutData = null;
}
};
/**
* Internal helper fired on `paste` events. If a callback was registered from a component, calls the
* callback with data from the clipboard.
*/
Clipboard.prototype._onPaste = function(elem, event) {
event.preventDefault();
const cb = event.originalEvent.clipboardData;
const plainText = cb.getData('text/plain');
const htmlText = cb.getData('text/html');
const pasteData = getPasteData(plainText, htmlText);
this._doPaste(pasteData, plainText);
};
var FOCUS_TARGET_TAGS = {
'INPUT': true,
'TEXTAREA': true,
'SELECT': true,
'IFRAME': true,
};
Clipboard.prototype._doContextMenuPaste = async function() {
let clipboardItem;
try {
clipboardItem = (await readDataFromClipboard())?.[0];
} catch {
showUnavailableMenuCommandModal('paste');
return;
}
const plainText = await getTextFromClipboardItem(clipboardItem, 'text/plain');
const htmlText = await getTextFromClipboardItem(clipboardItem, 'text/html');
const pasteData = getPasteData(plainText, htmlText);
this._doPaste(pasteData, plainText);
};
Clipboard.prototype._doPaste = function(pasteData, plainText) {
console.log(this._cutData, plainText, this._cutCallback);
if (this._cutData === plainText) {
if (this._cutCallback) {
// Cuts should only be possible on the first paste after a cut and only if the data being
// pasted matches the data that was cut.
commands.allCommands.paste.run(pasteData, this._cutCallback);
}
} else {
this._cutData = null;
commands.allCommands.paste.run(pasteData, null);
}
// The cut callback should only be usable once so it needs to be cleared after every paste.
this._cutCallback = null;
}
/**
* Returns data formatted as a 2D array of strings, suitable for pasting within Grist.
*
* Grist stores both text/html and text/plain when copying data. When pasting back, we first
* check if text/html exists (should exist for Grist and other spreadsheet software), and fall
* back to text/plain otherwise.
*/
function getPasteData(plainText, htmlText) {
try {
return tableUtil.parsePasteHtml(htmlText);
} catch (e) {
if (plainText === '' || plainText.charCodeAt(0) === 0xFEFF) {
return [['']];
} else {
return tsvDecode(plainText.replace(/\r\n?/g, "\n").trimEnd());
}
}
}
/**
* Returns clipboard data of the given `type` from `clipboardItem` as text.
*
* Returns an empty string if `clipboardItem` is nullish or no data exists
* for the given `type`.
*/
async function getTextFromClipboardItem(clipboardItem, type) {
if (!clipboardItem) { return ''; }
try {
return (await clipboardItem.getType(type)).text();
} catch {
// No clipboard data exists for the MIME type.
return '';
}
}
/**
* Helper to determine if the currently active element deserves to keep its own focus, and capture
* copy-paste events. Besides inputs and textareas, any element can be marked to be a valid
* copy-paste target by adding 'clipboard_focus' class to it.
*/
function allowFocus(elem) {
return elem && (FOCUS_TARGET_TAGS.hasOwnProperty(elem.tagName) ||
elem.hasAttribute("tabindex") ||
elem.classList.contains('clipboard_focus'));
}
Clipboard.allowFocus = allowFocus;
function showUnavailableMenuCommandModal(action) {
let keys;
switch (action) {
case 'cut': {
keys = 'Mod+X'
break;
}
case 'copy': {
keys = 'Mod+C'
break;
}
case 'paste': {
keys = 'Mod+V'
break;
}
default: {
throw new Error(`Clipboard: unrecognized action ${action}`);
}
}
confirmModal(
t("Unavailable Command"),
t("Got it"),
() => {},
{
explanation: cssModalContent(
t(
'The {{action}} menu command is not available in this browser. You can still {{action}}' +
' by using the keyboard shortcut {{shortcut}}.',
{
action,
shortcut: ShortcutKey(ShortcutKeyContent(getHumanKey(keys, isMac))),
}
),
),
hideCancel: true,
},
);
}
module.exports = Clipboard;
const cssModalContent = styled('div', `
line-height: 18px;
`);