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/*-
* ================================================================================
* eCOMP Portal
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ================================================================================
*/
'use strict';
angular.module('ecompApp').directive('imageUpload', function factory($q) {
var imageMimeRgx = /^image\/[a-zA-Z0-9]*$/;
var URL = window.URL || window.webkitURL;
var getResizeArea = function () {
var resizeAreaId = 'fileupload-resize-area';
var resizeArea = document.getElementById(resizeAreaId);
if (!resizeArea) {
resizeArea = document.createElement('canvas');
resizeArea.id = resizeAreaId;
resizeArea.style.visibility = 'hidden';
document.body.appendChild(resizeArea);
}
return resizeArea;
};
var resizeImage = function (origImage, options) {
var maxHeight = options.resizeMaxHeight || 300;
var maxWidth = options.resizeMaxWidth || 250;
var quality = options.resizeQuality || 0.7;
var type = options.resizeType || 'image/jpg';
var canvas = getResizeArea();
var height = origImage.height;
var width = origImage.width;
//image redraw starting points
var x0, y0;
// calculate the width and height, constraining the proportions
if (width > height) {
if (width > maxWidth) {
height = Math.round(height *= maxWidth / width);
width = maxWidth;
x0 = 0;
y0 = Math.round((maxHeight - height)/2);
}else{
maxHeight = height;
maxWidth = width;
x0 = 0;
y0 = 0;
}
} else {
if (height > maxHeight) {
width = Math.round(width *= maxHeight / height);
height = maxHeight;
x0 = Math.round((maxWidth - width)/2);
y0 = 0;
}else{
maxHeight = height;
maxWidth = width;
x0 = 0;
y0 = 0;
}
}
canvas.width = maxWidth;
canvas.height = maxHeight;
//draw image on canvas
var ctx = canvas.getContext('2d');
//set background color
if(options.backgroundColor){
ctx.fillStyle = options.backgroundColor;
ctx.fillRect(0,0,maxWidth,maxHeight);
}
ctx.drawImage(origImage, x0, y0, width, height);
// get the data from canvas as 70% jpg (or specified type).
return canvas.toDataURL(type, quality);
};
var createImage = function(url, callback) {
var image = new Image();
image.onload = function() {
callback(image);
};
image.src = url;
};
var fileToDataURL = function (file) {
var deferred = $q.defer();
var reader = new FileReader();
reader.onload = function (e) {
deferred.resolve(e.target.result);
};
reader.readAsDataURL(file);
return deferred.promise;
};
/**
* Image Upload directive
* ************************
* image-upload: image object , Mandatory
* image-upload-resize-max-height: <Number>, Optional (default 300), resize maximum height
* image-upload-resize-max-width: <Number>, Optional (default 270), resize maximum width
* image-upload-resize-quality: <Number>, Optional, value can be 0.0-1.0 (default 0.7), resize compression quality
* image-upload-resize-type: <String>, Optional, (default 'image/jpg'), image mime type
* image-upload-api: <Object>, Optional, pass an api reference object and get api.clearFile() function - clear input field and reset form validation
* image-upload-background-color: <String> color name, Optional, background color fill if image doesn't fit the whole desired resize area.
*
* in addition, if <input> element is part of <form>, in order to get form validation please set its 'name' attribute and 'ng-model' to get the following field validation errors:
* - 'mimeType' : in case the uploaded image is not an image
* - 'imageSize' : in case the image size (in bytes) is too large
*/
return {
restrict: 'A',
require: '^form',
scope: {
image: '=imageUpload',
resizeMaxHeight: '@?imageUploadResizeMaxHeight',
resizeMaxWidth: '@?imageUploadResizeMaxWidth',
resizeQuality: '@?imageUploadResizeQuality',
resizeType: '@?imageUploadResizeType',
imageApi: '=?imageUploadApi',
backgroundColor: '@?imageUploadBackgroundColor'
},
compile: function compile(tElement, tAttrs, transclude) {
return function postLink(scope, iElement, iAttrs, formCtrl) {
var doResizing = function(imageResult, callback) {
createImage(imageResult.url, function(image) {
var dataURL = resizeImage(image, scope);
imageResult.resized = {
dataURL: dataURL,
type: dataURL.match(/:(.+\/.+);/)[1]
};
callback(imageResult);
});
};
var applyScope = function(imageResult) {
scope.$apply(function() {
//console.log(imageResult);
if(iAttrs.multiple)
scope.image.push(imageResult);
else
scope.image = imageResult;
});
};
iElement.bind('change', function (evt) {
//when multiple always return an array of images
if(iAttrs.multiple)
scope.image = [];
var files = evt.target.files;
for(var i = 0; i < files.length; i++) {
setInputValidity(files[i]);
//create a result object for each file in files
var imageResult = {
file: files[i],
url: URL.createObjectURL(files[i])
};
fileToDataURL(files[i]).then(function (dataURL) {
imageResult.dataURL = dataURL;
});
if(scope.resizeMaxHeight || scope.resizeMaxWidth) { //resize image
doResizing(imageResult, function(imageResult) {
applyScope(imageResult);
});
}
else { //no resizing
applyScope(imageResult);
}
}
});
//API for otter actions
scope.imageApi = scope.imageApi || {};
scope.imageApi.clearFile = () => {
iElement[0].value = '';
setInputValidity();
};
let setInputValidity = file => {
//if form validation supported
if(formCtrl && iAttrs.name && formCtrl[iAttrs.name]){
formCtrl[iAttrs.name].$setDirty();
if(file && file.type && !imageMimeRgx.test(file.type)){
//set form invalid
formCtrl[iAttrs.name].$setValidity('mimeType', false);
applyScope();
return;
}
if(file && file.size && file.size > 1000000){
//set form invalid
formCtrl[iAttrs.name].$setValidity('imageSize', false);
applyScope();
return;
}
//set valid
formCtrl[iAttrs.name].$setValidity('mimeType', true);
formCtrl[iAttrs.name].$setValidity('imageSize', true);
}
}
}
}
}
});
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