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114 lines
4.1 KiB
JavaScript
114 lines
4.1 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT Web is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT Web includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global define*/
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define(
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[],
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function () {
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'use strict';
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// Drag handle dimensions
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var DRAG_HANDLE_SIZE = [ 6, 6 ];
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/**
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* Template-displayable drag handle for an element in fixed
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* position mode.
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* @memberof platform/features/layout
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* @constructor
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*/
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function FixedDragHandle(elementHandle, gridSize, update, commit) {
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this.elementHandle = elementHandle;
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this.gridSize = gridSize;
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this.update = update;
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this.commit = commit;
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}
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/**
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* Get a CSS style to position this drag handle.
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* @returns CSS style object (for `ng-style`)
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* @memberof platform/features/layout.FixedDragHandle#
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*/
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FixedDragHandle.prototype.style = function () {
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// Adjust from grid to pixel coordinates
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var x = this.elementHandle.x() * this.gridSize[0],
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y = this.elementHandle.y() * this.gridSize[1];
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// Convert to a CSS style centered on that point
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return {
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left: (x - DRAG_HANDLE_SIZE[0] / 2) + 'px',
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top: (y - DRAG_HANDLE_SIZE[1] / 2) + 'px',
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width: DRAG_HANDLE_SIZE[0] + 'px',
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height: DRAG_HANDLE_SIZE[1] + 'px'
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};
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};
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/**
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* Start a drag gesture. This should be called when a drag
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* begins to track initial state.
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*/
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FixedDragHandle.prototype.startDrag = function startDrag() {
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// Cache initial x/y positions
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this.dragging = {
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x: this.elementHandle.x(),
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y: this.elementHandle.y()
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};
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};
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/**
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* Continue a drag gesture; update x/y positions.
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* @param {number[]} delta x/y pixel difference since drag
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* started
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*/
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FixedDragHandle.prototype.continueDrag = function (delta) {
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if (this.dragging) {
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// Update x/y positions (snapping to grid)
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this.elementHandle.x(
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this.dragging.x + Math.round(delta[0] / this.gridSize[0])
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);
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this.elementHandle.y(
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this.dragging.y + Math.round(delta[1] / this.gridSize[1])
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);
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// Invoke update callback
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if (this.update) {
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this.update();
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}
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}
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};
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/**
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* End a drag gesture. This should be callled when a drag
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* concludes to trigger commit of changes.
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*/
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FixedDragHandle.prototype.endDrag = function () {
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// Clear cached state
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this.dragging = undefined;
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// Mark change as complete
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if (this.commit) {
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this.commit("Dragged handle.");
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}
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};
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return FixedDragHandle;
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}
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);
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