mirror of
https://github.com/classilla/tenfourfox.git
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271 lines
8.5 KiB
JavaScript
271 lines
8.5 KiB
JavaScript
#ifdef 0
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#endif
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/**
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* This singleton allows to transform the grid by repositioning a site's node
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* in the DOM and by showing or hiding the node. It additionally provides
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* convenience methods to work with a site's DOM node.
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*/
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var gTransformation = {
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/**
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* Returns the width of the left and top border of a cell. We need to take it
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* into account when measuring and comparing site and cell positions.
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*/
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get _cellBorderWidths() {
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let cstyle = window.getComputedStyle(gGrid.cells[0].node, null);
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let widths = {
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left: parseInt(cstyle.getPropertyValue("border-left-width")),
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top: parseInt(cstyle.getPropertyValue("border-top-width"))
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};
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// Cache this value, overwrite the getter.
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Object.defineProperty(this, "_cellBorderWidths",
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{value: widths, enumerable: true});
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return widths;
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},
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/**
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* Gets a DOM node's position.
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* @param aNode The DOM node.
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* @return A Rect instance with the position.
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*/
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getNodePosition: function Transformation_getNodePosition(aNode) {
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let {left, top, width, height} = aNode.getBoundingClientRect();
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return new Rect(left + scrollX, top + scrollY, width, height);
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},
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/**
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* Fades a given node from zero to full opacity.
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* @param aNode The node to fade.
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* @param aCallback The callback to call when finished.
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*/
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fadeNodeIn: function Transformation_fadeNodeIn(aNode, aCallback) {
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this._setNodeOpacity(aNode, 1, function () {
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// Clear the style property.
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aNode.style.opacity = "";
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if (aCallback)
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aCallback();
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});
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},
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/**
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* Fades a given node from full to zero opacity.
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* @param aNode The node to fade.
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* @param aCallback The callback to call when finished.
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*/
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fadeNodeOut: function Transformation_fadeNodeOut(aNode, aCallback) {
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this._setNodeOpacity(aNode, 0, aCallback);
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},
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/**
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* Fades a given site from zero to full opacity.
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* @param aSite The site to fade.
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* @param aCallback The callback to call when finished.
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*/
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showSite: function Transformation_showSite(aSite, aCallback) {
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this.fadeNodeIn(aSite.node, aCallback);
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},
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/**
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* Fades a given site from full to zero opacity.
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* @param aSite The site to fade.
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* @param aCallback The callback to call when finished.
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*/
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hideSite: function Transformation_hideSite(aSite, aCallback) {
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this.fadeNodeOut(aSite.node, aCallback);
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},
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/**
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* Allows to set a site's position.
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* @param aSite The site to re-position.
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* @param aPosition The desired position for the given site.
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*/
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setSitePosition: function Transformation_setSitePosition(aSite, aPosition) {
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let style = aSite.node.style;
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let {top, left} = aPosition;
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style.top = top + "px";
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style.left = left + "px";
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},
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/**
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* Freezes a site in its current position by positioning it absolute.
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* @param aSite The site to freeze.
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*/
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freezeSitePosition: function Transformation_freezeSitePosition(aSite) {
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if (this._isFrozen(aSite))
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return;
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let style = aSite.node.style;
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let comp = getComputedStyle(aSite.node, null);
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style.width = comp.getPropertyValue("width");
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style.height = comp.getPropertyValue("height");
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aSite.node.setAttribute("frozen", "true");
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this.setSitePosition(aSite, this.getNodePosition(aSite.node));
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},
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/**
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* Unfreezes a site by removing its absolute positioning.
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* @param aSite The site to unfreeze.
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*/
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unfreezeSitePosition: function Transformation_unfreezeSitePosition(aSite) {
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if (!this._isFrozen(aSite))
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return;
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let style = aSite.node.style;
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style.left = style.top = style.width = style.height = "";
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aSite.node.removeAttribute("frozen");
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},
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/**
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* Slides the given site to the target node's position.
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* @param aSite The site to move.
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* @param aTarget The slide target.
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* @param aOptions Set of options (see below).
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* unfreeze - unfreeze the site after sliding
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* callback - the callback to call when finished
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*/
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slideSiteTo: function Transformation_slideSiteTo(aSite, aTarget, aOptions) {
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let currentPosition = this.getNodePosition(aSite.node);
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let targetPosition = this.getNodePosition(aTarget.node)
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let callback = aOptions && aOptions.callback;
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let self = this;
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function finish() {
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if (aOptions && aOptions.unfreeze)
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self.unfreezeSitePosition(aSite);
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if (callback)
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callback();
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}
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// We need to take the width of a cell's border into account.
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targetPosition.left += this._cellBorderWidths.left;
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targetPosition.top += this._cellBorderWidths.top;
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// Nothing to do here if the positions already match.
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if (currentPosition.left == targetPosition.left &&
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currentPosition.top == targetPosition.top) {
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finish();
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} else {
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this.setSitePosition(aSite, targetPosition);
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this._whenTransitionEnded(aSite.node, ["left", "top"], finish);
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}
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},
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/**
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* Rearranges a given array of sites and moves them to their new positions or
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* fades in/out new/removed sites.
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* @param aSites An array of sites to rearrange.
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* @param aOptions Set of options (see below).
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* unfreeze - unfreeze the site after rearranging
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* callback - the callback to call when finished
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*/
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rearrangeSites: function Transformation_rearrangeSites(aSites, aOptions) {
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let batch = [];
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let cells = gGrid.cells;
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let callback = aOptions && aOptions.callback;
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let unfreeze = aOptions && aOptions.unfreeze;
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aSites.forEach(function (aSite, aIndex) {
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// Do not re-arrange empty cells or the dragged site.
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if (!aSite || aSite == gDrag.draggedSite)
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return;
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batch.push(new Promise(resolve => {
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if (!cells[aIndex]) {
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// The site disappeared from the grid, hide it.
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this.hideSite(aSite, resolve);
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} else if (this._getNodeOpacity(aSite.node) != 1) {
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// The site disappeared before but is now back, show it.
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this.showSite(aSite, resolve);
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} else {
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// The site's position has changed, move it around.
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this._moveSite(aSite, aIndex, {unfreeze: unfreeze, callback: resolve});
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}
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}));
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}, this);
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if (callback) {
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Promise.all(batch).then(callback);
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}
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},
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/**
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* Listens for the 'transitionend' event on a given node and calls the given
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* callback.
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* @param aNode The node that is transitioned.
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* @param aProperties The properties we'll wait to be transitioned.
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* @param aCallback The callback to call when finished.
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*/
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_whenTransitionEnded:
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function Transformation_whenTransitionEnded(aNode, aProperties, aCallback) {
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let props = new Set(aProperties);
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aNode.addEventListener("transitionend", function onEnd(e) {
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if (props.has(e.propertyName)) {
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aNode.removeEventListener("transitionend", onEnd);
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aCallback();
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}
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});
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},
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/**
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* Gets a given node's opacity value.
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* @param aNode The node to get the opacity value from.
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* @return The node's opacity value.
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*/
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_getNodeOpacity: function Transformation_getNodeOpacity(aNode) {
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let cstyle = window.getComputedStyle(aNode, null);
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return cstyle.getPropertyValue("opacity");
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},
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/**
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* Sets a given node's opacity.
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* @param aNode The node to set the opacity value for.
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* @param aOpacity The opacity value to set.
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* @param aCallback The callback to call when finished.
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*/
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_setNodeOpacity:
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function Transformation_setNodeOpacity(aNode, aOpacity, aCallback) {
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if (this._getNodeOpacity(aNode) == aOpacity) {
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if (aCallback)
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aCallback();
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} else {
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if (aCallback) {
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this._whenTransitionEnded(aNode, ["opacity"], aCallback);
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}
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aNode.style.opacity = aOpacity;
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}
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},
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/**
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* Moves a site to the cell with the given index.
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* @param aSite The site to move.
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* @param aIndex The target cell's index.
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* @param aOptions Options that are directly passed to slideSiteTo().
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*/
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_moveSite: function Transformation_moveSite(aSite, aIndex, aOptions) {
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this.freezeSitePosition(aSite);
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this.slideSiteTo(aSite, gGrid.cells[aIndex], aOptions);
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},
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/**
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* Checks whether a site is currently frozen.
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* @param aSite The site to check.
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* @return Whether the given site is frozen.
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*/
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_isFrozen: function Transformation_isFrozen(aSite) {
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return aSite.node.hasAttribute("frozen");
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}
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};
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