зеркало из https://github.com/mozilla/gecko-dev.git
270 строки
8.8 KiB
JavaScript
270 строки
8.8 KiB
JavaScript
/* 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// **********
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// Title: drag.js
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// ----------
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// Variable: drag
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// The Drag that's currently in process.
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var drag = {
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info: null,
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zIndex: 100,
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lastMoveTime: 0
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};
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//----------
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//Variable: resize
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//The resize (actually a Drag) that is currently in process
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var resize = {
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info: null,
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lastMoveTime: 0
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};
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// ##########
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// Class: Drag (formerly DragInfo)
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// Helper class for dragging <Item>s
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//
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// ----------
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// Constructor: Drag
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// Called to create a Drag in response to an <Item> draggable "start" event.
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// Note that it is also used partially during <Item>'s resizable method as well.
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//
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// Parameters:
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// item - The <Item> being dragged
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// event - The DOM event that kicks off the drag
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function Drag(item, event) {
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Utils.assert(item && (item.isAnItem || item.isAFauxItem),
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'must be an item, or at least a faux item');
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this.item = item;
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this.el = item.container;
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this.$el = iQ(this.el);
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this.parent = this.item.parent;
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this.startPosition = new Point(event.clientX, event.clientY);
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this.startTime = Date.now();
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this.item.isDragging = true;
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this.item.setZ(999999);
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this.safeWindowBounds = Items.getSafeWindowBounds();
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Trenches.activateOthersTrenches(this.el);
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};
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Drag.prototype = {
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// ----------
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// Function: toString
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// Prints [Drag (item)] for debug use
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toString: function Drag_toString() {
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return "[Drag (" + this.item + ")]";
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},
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// ----------
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// Function: snapBounds
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// Adjusts the given bounds according to the currently active trenches. Used by <Drag.snap>
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//
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// Parameters:
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// bounds - (<Rect>) bounds
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// stationaryCorner - which corner is stationary? by default, the top left in LTR mode,
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// and top right in RTL mode.
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// "topleft", "bottomleft", "topright", "bottomright"
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// assumeConstantSize - (boolean) whether the bounds' dimensions are sacred or not.
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// keepProportional - (boolean) if assumeConstantSize is false, whether we should resize
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// proportionally or not
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// checkItemStatus - (boolean) make sure this is a valid item which should be snapped
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snapBounds: function Drag_snapBounds(bounds, stationaryCorner, assumeConstantSize, keepProportional, checkItemStatus) {
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if (!stationaryCorner)
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stationaryCorner = UI.rtl ? 'topright' : 'topleft';
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var update = false; // need to update
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var updateX = false;
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var updateY = false;
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var newRect;
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var snappedTrenches = {};
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// OH SNAP!
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// if we aren't holding down the meta key or have trenches disabled...
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if (!Keys.meta && !Trenches.disabled) {
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// snappable = true if we aren't a tab on top of something else, and
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// there's no active drop site...
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let snappable = !(this.item.isATabItem &&
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this.item.overlapsWithOtherItems()) &&
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!iQ(".acceptsDrop").length;
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if (!checkItemStatus || snappable) {
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newRect = Trenches.snap(bounds, stationaryCorner, assumeConstantSize,
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keepProportional);
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if (newRect) { // might be false if no changes were made
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update = true;
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snappedTrenches = newRect.snappedTrenches || {};
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bounds = newRect;
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}
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}
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}
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// make sure the bounds are in the window.
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newRect = this.snapToEdge(bounds, stationaryCorner, assumeConstantSize,
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keepProportional);
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if (newRect) {
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update = true;
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bounds = newRect;
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Utils.extend(snappedTrenches, newRect.snappedTrenches);
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}
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Trenches.hideGuides();
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for (var edge in snappedTrenches) {
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var trench = snappedTrenches[edge];
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if (typeof trench == 'object') {
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trench.showGuide = true;
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trench.show();
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}
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}
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return update ? bounds : false;
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},
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// ----------
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// Function: snap
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// Called when a drag or mousemove occurs. Set the bounds based on the mouse move first, then
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// call snap and it will adjust the item's bounds if appropriate. Also triggers the display of
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// trenches that it snapped to.
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//
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// Parameters:
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// stationaryCorner - which corner is stationary? by default, the top left in LTR mode,
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// and top right in RTL mode.
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// "topleft", "bottomleft", "topright", "bottomright"
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// assumeConstantSize - (boolean) whether the bounds' dimensions are sacred or not.
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// keepProportional - (boolean) if assumeConstantSize is false, whether we should resize
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// proportionally or not
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snap: function Drag_snap(stationaryCorner, assumeConstantSize, keepProportional) {
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var bounds = this.item.getBounds();
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bounds = this.snapBounds(bounds, stationaryCorner, assumeConstantSize, keepProportional, true);
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if (bounds) {
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this.item.setBounds(bounds, true);
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return true;
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}
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return false;
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},
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// --------
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// Function: snapToEdge
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// Returns a version of the bounds snapped to the edge if it is close enough. If not,
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// returns false. If <Keys.meta> is true, this function will simply enforce the
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// window edges.
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//
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// Parameters:
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// rect - (<Rect>) current bounds of the object
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// stationaryCorner - which corner is stationary? by default, the top left in LTR mode,
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// and top right in RTL mode.
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// "topleft", "bottomleft", "topright", "bottomright"
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// assumeConstantSize - (boolean) whether the rect's dimensions are sacred or not
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// keepProportional - (boolean) if we are allowed to change the rect's size, whether the
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// dimensions should scaled proportionally or not.
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snapToEdge: function Drag_snapToEdge(rect, stationaryCorner, assumeConstantSize, keepProportional) {
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var swb = this.safeWindowBounds;
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var update = false;
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var updateX = false;
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var updateY = false;
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var snappedTrenches = {};
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var snapRadius = (Keys.meta ? 0 : Trenches.defaultRadius);
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if (rect.left < swb.left + snapRadius ) {
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if (stationaryCorner.indexOf('right') > -1 && !assumeConstantSize)
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rect.width = rect.right - swb.left;
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rect.left = swb.left;
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update = true;
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updateX = true;
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snappedTrenches.left = 'edge';
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}
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if (rect.right > swb.right - snapRadius) {
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if (updateX || !assumeConstantSize) {
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var newWidth = swb.right - rect.left;
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if (keepProportional)
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rect.height = rect.height * newWidth / rect.width;
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rect.width = newWidth;
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update = true;
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} else if (!updateX || !Trenches.preferLeft) {
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rect.left = swb.right - rect.width;
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update = true;
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}
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snappedTrenches.right = 'edge';
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delete snappedTrenches.left;
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}
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if (rect.top < swb.top + snapRadius) {
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if (stationaryCorner.indexOf('bottom') > -1 && !assumeConstantSize)
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rect.height = rect.bottom - swb.top;
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rect.top = swb.top;
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update = true;
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updateY = true;
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snappedTrenches.top = 'edge';
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}
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if (rect.bottom > swb.bottom - snapRadius) {
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if (updateY || !assumeConstantSize) {
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var newHeight = swb.bottom - rect.top;
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if (keepProportional)
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rect.width = rect.width * newHeight / rect.height;
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rect.height = newHeight;
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update = true;
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} else if (!updateY || !Trenches.preferTop) {
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rect.top = swb.bottom - rect.height;
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update = true;
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}
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snappedTrenches.top = 'edge';
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delete snappedTrenches.bottom;
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}
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if (update) {
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rect.snappedTrenches = snappedTrenches;
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return rect;
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}
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return false;
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},
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// ----------
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// Function: drag
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// Called in response to an <Item> draggable "drag" event.
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drag: function Drag_drag(event) {
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this.snap(UI.rtl ? 'topright' : 'topleft', true);
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if (this.parent && this.parent.expanded) {
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var distance = this.startPosition.distance(new Point(event.clientX, event.clientY));
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if (distance > 100) {
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this.parent.remove(this.item);
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this.parent.collapse();
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}
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}
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},
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// ----------
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// Function: stop
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// Called in response to an <Item> draggable "stop" event.
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//
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// Parameters:
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// immediately - bool for doing the pushAway immediately, without animation
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stop: function Drag_stop(immediately) {
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Trenches.hideGuides();
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this.item.isDragging = false;
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if (this.parent && this.parent != this.item.parent)
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this.parent.closeIfEmpty();
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if (this.parent && this.parent.expanded)
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this.parent.arrange();
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if (this.item.parent)
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this.item.parent.arrange();
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if (this.item.isAGroupItem) {
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this.item.setZ(drag.zIndex);
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drag.zIndex++;
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this.item.pushAway(immediately);
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}
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Trenches.disactivate();
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}
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};
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