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3
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1 'use strict';
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2
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3 let dad = {};
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4
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5 {
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4
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6 // override these if needed
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3
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7 dad.whatToDrag = function(draggable) {
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8 return draggable;
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9 };
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4
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10 dad.onDrop = function(event) {};
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11 dad.onDropped = function(event) {};
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6
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12 dad.onEnter = function(event) {};
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13 dad.onLeave = function(event) {};
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3
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14
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15
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16 let original = null;
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17 let dragging = null;
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6
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18 let dropzone = null;
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3
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19 let touchX, touchY;
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20
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6
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21 function isIn(x,y,rect) {
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22 return rect.x <= x && x <= rect.x+rect.width && rect.y <= y && y <= rect.y+rect.height;
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23 }
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24
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3
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25 function onMouseMove(event) {
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26 //console.log(event);
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6
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27 {
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28 event.preventDefault();
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29 let rect = dragging.getBoundingClientRect();
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30 dragging.style.left = `${rect.x+event.movementX}px`;
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31 let y = rect.y + event.movementY;
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32 if( y < 0 ) {
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33 window.scrollBy( 0, y );
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34 } else if( y + rect.height > window.innerHeight ) {
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35 window.scrollBy( 0, y + rect.height - window.innerHeight );
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36 }
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37 dragging.style.top = `${y}px`;
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3
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38 }
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6
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39 {
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40 let x = event.clientX;
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41 let y = event.clientY;
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42 if( !(dropzone && isIn(x,y,dropzone.getBoundingClientRect())) ) {
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43 if( dropzone ) {
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44 dad.onLeave({
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45 original: original,
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46 dragging: dragging,
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47 dropzone: dropzone,
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48 mouseEvent: event,
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49 });
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50 dropzone = null;
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51 }
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52 let dropzones = document.querySelectorAll('[dad-dropzone]');
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53 for( let i=0; i<dropzones.length; i++ ) {
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54 let dz = dropzones[i];
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55 if( dz === dragging )
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56 continue;
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57 if( isIn(x,y,dz.getBoundingClientRect()) ) {
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58 dropzone = dz;
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59 dad.onEnter({
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60 original: original,
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61 dragging: dragging,
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62 dropzone: dropzone,
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63 mouseEvent: event,
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64 });
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65 break;
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66 }
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67 }
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68 }
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69 }
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3
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70 }
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71
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72 function onTouchMove(event) {
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73 let touches = event.touches;
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74 if( touches.length !== 1 )
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75 return;
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76 let touch = touches[0];
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77 let x = touch.clientX;
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78 let y = touch.clientY;
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6
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79 event.clientX = x;
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80 event.clientY = y;
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3
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81 event.movementX = x - touchX;
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82 event.movementY = y - touchY;
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83 touchX = x;
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84 touchY = y;
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85 onMouseMove(event);
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86 }
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87
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88 function onMouseUp(event) {
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89 //console.log(event);
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90 dad.onDrop({
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5
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91 original: original,
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92 dragging: dragging,
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93 dropzone: dropzone,
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94 mouseEvent: event,
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95 });
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6
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96 if( dropzone ) {
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97 dad.onLeave({
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98 original: original,
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99 dragging: dragging,
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100 dropzone: dropzone,
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101 mouseEvent: event,
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102 });
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103 }
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104 original.removeAttribute('dad-original');
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105 dragging.parentNode.removeChild(dragging);
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106 document.removeEventListener('mousemove',onMouseMove);
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107 document.removeEventListener('mouseup',onMouseUp);
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108 document.removeEventListener('mousemove',onMouseMove);
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109 document.removeEventListener('touchend',onMouseUp);
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110 original.scrollIntoViewIfNeeded(false);
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111 let droppedEvent = {
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5
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112 original: original,
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113 };
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114 original = null;
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115 dragging = null;
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116 dropzone = null;
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117 dad.onDropped(droppedEvent);
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118 }
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119
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120 function start(event) {
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121 //console.log(event);
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122 original = dad.whatToDrag(event.target);
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123 dragging = original.cloneNode(true);
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124 original.setAttribute('dad-original','');
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125 dragging.setAttribute('dad-dragging','');
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126 let rect = original.getBoundingClientRect();
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127 dragging.style.left = `${rect.x}px`;
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128 dragging.style.top = `${rect.y}px`;
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4
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129 original.parentNode.appendChild(dragging);
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3
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130 }
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131
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132 function onMouseDown(event) {
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133 start(event);
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134 document.addEventListener('mousemove',onMouseMove);
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135 document.addEventListener('mouseup',onMouseUp);
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136 }
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137
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138 function onTouchStart(event) {
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139 start(event);
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140 let touches = event.touches;
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141 if( touches.length !== 1 )
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142 return;
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143 let touch = touches[0];
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144 touchX = touch.clientX;
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145 touchY = touch.clientY;
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146 document.addEventListener('touchmove',onTouchMove);
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147 document.addEventListener('touchend',onMouseUp);
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148 }
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149
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150 dad.setDraggable = function(el) {
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151 el.setAttribute('dad-drag','');
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152 el.addEventListener('mousedown',onMouseDown);
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153 el.addEventListener('touchstart',onTouchStart);
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154 };
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6
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155
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156 dad.setDropzone = function(el) {
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157 el.setAttribute('dad-dropzone','');
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158 };
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3
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159 }
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