From 6acc5f9128db1c2c0d0c468f6123d0dccf153156 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 30 Nov 2018 11:15:06 -0500 Subject: Issue #889 - Clean up the Pale Moon tree - Part 1b: Move newtab to components --- application/palemoon/components/newtab/drag.js | 151 +++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 application/palemoon/components/newtab/drag.js (limited to 'application/palemoon/components/newtab/drag.js') diff --git a/application/palemoon/components/newtab/drag.js b/application/palemoon/components/newtab/drag.js new file mode 100644 index 000000000..e3928ebd0 --- /dev/null +++ b/application/palemoon/components/newtab/drag.js @@ -0,0 +1,151 @@ +#ifdef 0 +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ +#endif + +/** + * This singleton implements site dragging functionality. + */ +var gDrag = { + /** + * The site offset to the drag start point. + */ + _offsetX: null, + _offsetY: null, + + /** + * The site that is dragged. + */ + _draggedSite: null, + get draggedSite() { return this._draggedSite; }, + + /** + * The cell width/height at the point the drag started. + */ + _cellWidth: null, + _cellHeight: null, + get cellWidth() { return this._cellWidth; }, + get cellHeight() { return this._cellHeight; }, + + /** + * Start a new drag operation. + * @param aSite The site that's being dragged. + * @param aEvent The 'dragstart' event. + */ + start: function Drag_start(aSite, aEvent) { + this._draggedSite = aSite; + + // Mark nodes as being dragged. + let selector = ".newtab-site, .newtab-control, .newtab-thumbnail"; + let parentCell = aSite.node.parentNode; + let nodes = parentCell.querySelectorAll(selector); + for (let i = 0; i < nodes.length; i++) + nodes[i].setAttribute("dragged", "true"); + + parentCell.setAttribute("dragged", "true"); + + this._setDragData(aSite, aEvent); + + // Store the cursor offset. + let node = aSite.node; + let rect = node.getBoundingClientRect(); + this._offsetX = aEvent.clientX - rect.left; + this._offsetY = aEvent.clientY - rect.top; + + // Store the cell dimensions. + let cellNode = aSite.cell.node; + this._cellWidth = cellNode.offsetWidth; + this._cellHeight = cellNode.offsetHeight; + + gTransformation.freezeSitePosition(aSite); + }, + + /** + * Handles the 'drag' event. + * @param aSite The site that's being dragged. + * @param aEvent The 'drag' event. + */ + drag: function Drag_drag(aSite, aEvent) { + // Get the viewport size. + let {clientWidth, clientHeight} = document.documentElement; + + // We'll want a padding of 5px. + let border = 5; + + // Enforce minimum constraints to keep the drag image inside the window. + let left = Math.max(scrollX + aEvent.clientX - this._offsetX, border); + let top = Math.max(scrollY + aEvent.clientY - this._offsetY, border); + + // Enforce maximum constraints to keep the drag image inside the window. + left = Math.min(left, scrollX + clientWidth - this.cellWidth - border); + top = Math.min(top, scrollY + clientHeight - this.cellHeight - border); + + // Update the drag image's position. + gTransformation.setSitePosition(aSite, {left: left, top: top}); + }, + + /** + * Ends the current drag operation. + * @param aSite The site that's being dragged. + * @param aEvent The 'dragend' event. + */ + end: function Drag_end(aSite, aEvent) { + let nodes = gGrid.node.querySelectorAll("[dragged]") + for (let i = 0; i < nodes.length; i++) + nodes[i].removeAttribute("dragged"); + + // Slide the dragged site back into its cell (may be the old or the new cell). + gTransformation.slideSiteTo(aSite, aSite.cell, {unfreeze: true}); + + this._draggedSite = null; + }, + + /** + * Checks whether we're responsible for a given drag event. + * @param aEvent The drag event to check. + * @return Whether we should handle this drag and drop operation. + */ + isValid: function Drag_isValid(aEvent) { + let link = gDragDataHelper.getLinkFromDragEvent(aEvent); + + // Check that the drag data is non-empty. + // Can happen when dragging places folders. + if (!link || !link.url) { + return false; + } + + // Check that we're not accepting URLs which would inherit the caller's + // principal (such as javascript: or data:). + return gLinkChecker.checkLoadURI(link.url); + }, + + /** + * Initializes the drag data for the current drag operation. + * @param aSite The site that's being dragged. + * @param aEvent The 'dragstart' event. + */ + _setDragData: function Drag_setDragData(aSite, aEvent) { + let {url, title} = aSite; + + let dt = aEvent.dataTransfer; + dt.mozCursor = "default"; + dt.effectAllowed = "move"; + dt.setData("text/plain", url); + dt.setData("text/uri-list", url); + dt.setData("text/x-moz-url", url + "\n" + title); + dt.setData("text/html", "" + url + ""); + + // Create and use an empty drag element. We don't want to use the default + // drag image with its default opacity. + let dragElement = document.createElementNS(HTML_NAMESPACE, "div"); + dragElement.classList.add("newtab-drag"); + let scrollbox = document.getElementById("newtab-vertical-margin"); + scrollbox.appendChild(dragElement); + dt.setDragImage(dragElement, 0, 0); + + // After the 'dragstart' event has been processed we can remove the + // temporary drag element from the DOM. + setTimeout(() => scrollbox.removeChild(dragElement), 0); + } +}; -- cgit v1.2.3