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/* |
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* https://github.com/legalthings/signature-pad-angular |
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* Copyright (c) 2015 ; Licensed MIT |
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*/ |
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angular.module('signature', []); |
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angular.module('signature').directive('signaturePad', ['$interval', '$timeout', '$window', |
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function ($interval, $timeout, $window) { |
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'use strict'; |
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var signaturePad, element, EMPTY_IMAGE = 'data:image/png;base64,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'; |
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return { |
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restrict: 'EA', |
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replace: true, |
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template: '<div class="signature" style="width: 100%; max-width:{{width}}px; height: 100%; max-height:{{height}}px;"><canvas style="display: block; margin: 0 auto;" ng-mouseup="onMouseup()" ng-mouseleave="onMouseleave($event)" ng-mousedown="notifyDrawing({ drawing: true })"></canvas></div>', |
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scope: { |
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accept: '=?', |
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clear: '=?', |
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disabled: '=?', |
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dataurl: '=?', |
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height: '@', |
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width: '@', |
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notifyDrawing: '&onDrawing', |
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}, |
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controller: [ |
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'$scope', |
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function ($scope) { |
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$scope.accept = function () { |
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return { |
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isEmpty: $scope.dataurl === EMPTY_IMAGE, |
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dataUrl: $scope.dataurl |
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}; |
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}; |
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$scope.onMouseup = function () { |
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$scope.endDrawing(); |
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}; |
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$scope.onMouseleave = function (event) { |
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// left button depressed |
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if (event.buttons & 1 === 1) { |
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$scope.endDrawing(); |
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} |
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}; |
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$scope.endDrawing = function () { |
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$scope.updateModel(); |
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// notify that drawing has ended |
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$scope.notifyDrawing({ drawing: false }); |
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}; |
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$scope.updateModel = function () { |
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/* |
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defer handling mouseup event until $scope.signaturePad handles |
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first the same event |
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*/ |
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$timeout().then(function () { |
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$scope.dataurl = $scope.signaturePad.isEmpty() ? EMPTY_IMAGE : $scope.signaturePad.toDataURL(); |
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}); |
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}; |
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$scope.clear = function () { |
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$scope.signaturePad.clear(); |
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$scope.dataurl = EMPTY_IMAGE; |
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}; |
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$scope.$watch("dataurl", function (dataUrl) { |
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if (!dataUrl || $scope.signaturePad.toDataURL() === dataUrl) { |
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return; |
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} |
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$scope.setDataUrl(dataUrl); |
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}); |
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} |
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], |
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link: function (scope, element, attrs) { |
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var canvas = element.find('canvas')[0]; |
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var parent = canvas.parentElement; |
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var scale = 0; |
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var ctx = canvas.getContext('2d'); |
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var width = parseInt(scope.width, 10); |
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var height = parseInt(scope.height, 10); |
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canvas.width = width; |
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canvas.height = height; |
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scope.signaturePad = new SignaturePad(canvas); |
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scope.setDataUrl = function(dataUrl) { |
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var ratio = Math.max(window.devicePixelRatio || 1, 1); |
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ctx.setTransform(1, 0, 0, 1, 0, 0); |
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ctx.scale(ratio, ratio); |
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scope.signaturePad.clear(); |
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scope.signaturePad.fromDataURL(dataUrl); |
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$timeout().then(function() { |
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ctx.setTransform(1, 0, 0, 1, 0, 0); |
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ctx.scale(1 / scale, 1 / scale); |
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}); |
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}; |
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scope.$watch('disabled', function (val) { |
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val ? scope.signaturePad.off() : scope.signaturePad.on(); |
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}); |
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var calculateScale = function() { |
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var scaleWidth = Math.min(parent.clientWidth / width, 1); |
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var scaleHeight = Math.min(parent.clientHeight / height, 1); |
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var newScale = Math.min(scaleWidth, scaleHeight); |
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if (newScale === scale) { |
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return; |
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} |
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var newWidth = width * newScale; |
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var newHeight = height * newScale; |
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canvas.style.height = Math.round(newHeight) + "px"; |
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canvas.style.width = Math.round(newWidth) + "px"; |
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scale = newScale; |
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ctx.setTransform(1, 0, 0, 1, 0, 0); |
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ctx.scale(1 / scale, 1 / scale); |
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}; |
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var resizeIH = $interval(calculateScale, 200); |
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scope.$on('$destroy', function () { |
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$interval.cancel(resizeIH); |
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resizeIH = null; |
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}); |
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angular.element($window).bind('resize', calculateScale); |
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scope.$on('$destroy', function () { |
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angular.element($window).unbind('resize', calculateScale); |
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}); |
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calculateScale(); |
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element.on('touchstart', onTouchstart); |
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element.on('touchend', onTouchend); |
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function onTouchstart(event) { |
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scope.$apply(function () { |
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// notify that drawing has started |
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scope.notifyDrawing({ drawing: true }); |
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}); |
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event.preventDefault(); |
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} |
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function onTouchend(event) { |
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scope.$apply(function () { |
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// updateModel |
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scope.updateModel(); |
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// notify that drawing has ended |
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scope.notifyDrawing({ drawing: false }); |
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}); |
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event.preventDefault(); |
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} |
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} |
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}; |
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} |
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]); |
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// Backward compatibility |
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angular.module('ngSignaturePad', ['signature']); |
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