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