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<h1 class="page-title">Source: svgcanvas/undo.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* Tools for undo.
* @module undo
* @license MIT
* @copyright 2011 Jeff Schiller
*/
import * as draw from './draw.js';
import * as hstry from './history.js';
import {
getRotationAngle, getBBox as utilsGetBBox, isNullish, setHref, getStrokedBBoxDefaultVisible
} from './utilities.js';
import {
isGecko
} from '../common/browser.js';
import {
transformPoint, transformListToTransform
} from './math.js';
const {
UndoManager, HistoryEventTypes
} = hstry;
let undoContext_ = null;
/**
* @function module:undo.init
* @param {module:undo.undoContext} undoContext
* @returns {void}
*/
export const init = function (undoContext) {
undoContext_ = undoContext;
};
export const getUndoManager = function () {
return new UndoManager({
/**
* @param {string} eventType One of the HistoryEvent types
* @param {module:history.HistoryCommand} cmd Fulfills the HistoryCommand interface
* @fires module:undo.SvgCanvas#event:changed
* @returns {void}
*/
handleHistoryEvent (eventType, cmd) {
const EventTypes = HistoryEventTypes;
// TODO: handle setBlurOffsets.
if (eventType === EventTypes.BEFORE_UNAPPLY || eventType === EventTypes.BEFORE_APPLY) {
undoContext_.getCanvas().clearSelection();
} else if (eventType === EventTypes.AFTER_APPLY || eventType === EventTypes.AFTER_UNAPPLY) {
const elems = cmd.elements();
undoContext_.getCanvas().pathActions.clear();
undoContext_.call('changed', elems);
const cmdType = cmd.type();
const isApply = (eventType === EventTypes.AFTER_APPLY);
if (cmdType === 'MoveElementCommand') {
const parent = isApply ? cmd.newParent : cmd.oldParent;
if (parent === undoContext_.getSVGContent()) {
draw.identifyLayers();
}
} else if (cmdType === 'InsertElementCommand' || cmdType === 'RemoveElementCommand') {
if (cmd.parent === undoContext_.getSVGContent()) {
draw.identifyLayers();
}
if (cmdType === 'InsertElementCommand') {
if (isApply) {
undoContext_.restoreRefElems(cmd.elem);
}
} else if (!isApply) {
undoContext_.restoreRefElems(cmd.elem);
}
if (cmd.elem && cmd.elem.tagName === 'use') {
undoContext_.getCanvas().setUseData(cmd.elem);
}
} else if (cmdType === 'ChangeElementCommand') {
// if we are changing layer names, re-identify all layers
if (cmd.elem.tagName === 'title' &&
cmd.elem.parentNode.parentNode === undoContext_.getSVGContent()
) {
draw.identifyLayers();
}
const values = isApply ? cmd.newValues : cmd.oldValues;
// If stdDeviation was changed, update the blur.
if (values.stdDeviation) {
undoContext_.getCanvas().setBlurOffsets(cmd.elem.parentNode, values.stdDeviation);
}
if (cmd.elem.tagName === 'text'){
const [ dx, dy ] = [ cmd.newValues.x - cmd.oldValues.x,
cmd.newValues.y - cmd.oldValues.y ];
const tspans = cmd.elem.children;
for (let i = 0; i < tspans.length; i++){
let x = Number(tspans[i].getAttribute('x'));
let y = Number(tspans[i].getAttribute('y'));
const unapply = (eventType === EventTypes.AFTER_UNAPPLY);
x = unapply? x - dx: x + dx;
y = unapply? y - dy: y + dy;
tspans[i].setAttribute('x', x);
tspans[i].setAttribute('y', y);
}
}
}
}
}
});
};
/**
* Hack for Firefox bugs where text element features aren't updated or get
* messed up. See issue 136 and issue 137.
* This function clones the element and re-selects it.
* @function module:svgcanvas~ffClone
* @todo Test for this bug on load and add it to "support" object instead of
* browser sniffing
* @param {Element} elem - The (text) DOM element to clone
* @returns {Element} Cloned element
*/
export const ffClone = function (elem) {
if (!isGecko()) { return elem; }
const clone = elem.cloneNode(true);
elem.before(clone);
elem.remove();
undoContext_.getCanvas().selectorManager.releaseSelector(elem);
undoContext_.getCanvas().setSelectedElements(0, clone);
undoContext_.getCanvas().selectorManager.requestSelector(clone).showGrips(true);
return clone;
};
/**
* This function makes the changes to the elements. It does not add the change
* to the history stack.
* @param {string} attr - Attribute name
* @param {string|Float} newValue - String or number with the new attribute value
* @param {Element[]} elems - The DOM elements to apply the change to
* @returns {void}
*/
export const changeSelectedAttributeNoUndoMethod = function (attr, newValue, elems) {
const selectedElements = undoContext_.getSelectedElements();
const currentZoom = undoContext_.getCurrentZoom();
if (undoContext_.getCurrentMode() === 'pathedit') {
// Editing node
undoContext_.getCanvas().pathActions.moveNode(attr, newValue);
}
elems = elems || selectedElements;
let i = elems.length;
const noXYElems = [ 'g', 'polyline', 'path' ];
// const goodGAttrs = ['transform', 'opacity', 'filter'];
while (i--) {
let elem = elems[i];
if (isNullish(elem)) { continue; }
// Set x,y vals on elements that don't have them
if ((attr === 'x' || attr === 'y') && noXYElems.includes(elem.tagName)) {
const bbox = getStrokedBBoxDefaultVisible([ elem ]);
const diffX = attr === 'x' ? newValue - bbox.x : 0;
const diffY = attr === 'y' ? newValue - bbox.y : 0;
undoContext_.getCanvas().moveSelectedElements(diffX * currentZoom, diffY * currentZoom, true);
continue;
}
// only allow the transform/opacity/filter attribute to change on <g> elements, slightly hacky
// TODO: Missing statement body
// if (elem.tagName === 'g' && goodGAttrs.includes(attr)) {}
let oldval = attr === '#text' ? elem.textContent : elem.getAttribute(attr);
if (isNullish(oldval)) { oldval = ''; }
if (oldval !== String(newValue)) {
if (attr === '#text') {
// const oldW = utilsGetBBox(elem).width;
elem.textContent = newValue;
// FF bug occurs on on rotated elements
if ((/rotate/).test(elem.getAttribute('transform'))) {
elem = ffClone(elem);
}
// Hoped to solve the issue of moving text with text-anchor="start",
// but this doesn't actually fix it. Hopefully on the right track, though. -Fyrd
// const box = getBBox(elem), left = box.x, top = box.y, {width, height} = box,
// dx = width - oldW, dy = 0;
// const angle = getRotationAngle(elem, true);
// if (angle) {
// const r = Math.sqrt(dx * dx + dy * dy);
// const theta = Math.atan2(dy, dx) - angle;
// dx = r * Math.cos(theta);
// dy = r * Math.sin(theta);
//
// elem.setAttribute('x', elem.getAttribute('x') - dx);
// elem.setAttribute('y', elem.getAttribute('y') - dy);
// }
} else if (attr === '#href') {
setHref(elem, newValue);
} else if (newValue) {
elem.setAttribute(attr, newValue);
} else if (typeof newValue === 'number') {
elem.setAttribute(attr, newValue);
} else {
elem.removeAttribute(attr);
}
// Go into "select" mode for text changes
// NOTE: Important that this happens AFTER elem.setAttribute() or else attributes like
// font-size can get reset to their old value, ultimately by svgEditor.updateContextPanel(),
// after calling textActions.toSelectMode() below
if (undoContext_.getCurrentMode() === 'textedit' && attr !== '#text' && elem.textContent.length) {
undoContext_.getCanvas().textActions.toSelectMode(elem);
}
// if (i === 0) {
// selectedBBoxes[0] = utilsGetBBox(elem);
// }
// Use the Firefox ffClone hack for text elements with gradients or
// where other text attributes are changed.
if (isGecko() &&
elem.nodeName === 'text' &&
(/rotate/).test(elem.getAttribute('transform')) &&
(String(newValue).startsWith('url') || ([ 'font-size', 'font-family', 'x', 'y' ].includes(attr) && elem.textContent))) {
elem = ffClone(elem);
}
// Timeout needed for Opera & Firefox
// codedread: it is now possible for this function to be called with elements
// that are not in the selectedElements array, we need to only request a
// selector if the element is in that array
if (selectedElements.includes(elem)) {
// eslint-disable-next-line no-loop-func
setTimeout(function () {
// Due to element replacement, this element may no longer
// be part of the DOM
if (!elem.parentNode) { return; }
undoContext_.getCanvas().selectorManager.requestSelector(elem).resize();
}, 0);
}
// if this element was rotated, and we changed the position of this element
// we need to update the rotational transform attribute
const angle = getRotationAngle(elem);
if (angle !== 0 && attr !== 'transform') {
const tlist = elem.transform?.baseVal;
let n = tlist.numberOfItems;
while (n--) {
const xform = tlist.getItem(n);
if (xform.type === 4) {
// remove old rotate
tlist.removeItem(n);
const box = utilsGetBBox(elem);
const center = transformPoint(
box.x + box.width / 2, box.y + box.height / 2, transformListToTransform(tlist).matrix
);
const cx = center.x;
const cy = center.y;
const newrot = undoContext_.getSVGRoot().createSVGTransform();
newrot.setRotate(angle, cx, cy);
tlist.insertItemBefore(newrot, n);
break;
}
}
}
} // if oldValue != newValue
} // for each elem
};
/**
* Change the given/selected element and add the original value to the history stack.
* If you want to change all `selectedElements`, ignore the `elems` argument.
* If you want to change only a subset of `selectedElements`, then send the
* subset to this function in the `elems` argument.
* @function module:svgcanvas.SvgCanvas#changeSelectedAttribute
* @param {string} attr - String with the attribute name
* @param {string|Float} val - String or number with the new attribute value
* @param {Element[]} elems - The DOM elements to apply the change to
* @returns {void}
*/
export const changeSelectedAttributeMethod = function (attr, val, elems) {
const selectedElements = undoContext_.getSelectedElements();
elems = elems || selectedElements;
undoContext_.getCanvas().undoMgr.beginUndoableChange(attr, elems);
// const i = elems.length;
changeSelectedAttributeNoUndoMethod(attr, val, elems);
const batchCmd = undoContext_.getCanvas().undoMgr.finishUndoableChange();
if (!batchCmd.isEmpty()) {
// undoContext_.addCommandToHistory(batchCmd);
undoContext_.getCanvas().undoMgr.addCommandToHistory(batchCmd);
}
};
</code></pre>
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