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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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3
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12
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13
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14 let original = null;
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15 let dragging = null;
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16 let touchX, touchY;
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17
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18 function onMouseMove(event) {
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19 //console.log(event);
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20 event.preventDefault();
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21 let rect = dragging.getBoundingClientRect();
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22 dragging.style.left = `${rect.x+event.movementX}px`;
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23 let y = rect.y + event.movementY;
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24 if( y < 0 ) {
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25 window.scrollBy( 0, y );
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26 } else if( y + rect.height > window.innerHeight ) {
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27 window.scrollBy( 0, y + rect.height - window.innerHeight );
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28 }
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29 dragging.style.top = `${y}px`;
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30 }
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31
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32 function onTouchMove(event) {
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33 let touches = event.touches;
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34 if( touches.length !== 1 )
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35 return;
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36 let touch = touches[0];
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37 let x = touch.clientX;
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38 let y = touch.clientY;
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39 event.movementX = x - touchX;
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40 event.movementY = y - touchY;
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41 touchX = x;
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42 touchY = y;
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43 onMouseMove(event);
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44 }
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45
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46 function onMouseUp(event) {
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47 //console.log(event);
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4
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48 dad.onDrop({
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49 draggable: original,
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50 dragged: dragging,
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51 mouseEvent: event,
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52 });
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53 original.removeAttribute('dad-original');
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4
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54 dragging.parentNode.removeChild(dragging);
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55 document.removeEventListener('mousemove',onMouseMove);
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56 document.removeEventListener('mouseup',onMouseUp);
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57 document.removeEventListener('mousemove',onMouseMove);
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58 document.removeEventListener('touchend',onMouseUp);
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59 original.scrollIntoViewIfNeeded(false);
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4
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60 let droppedEvent = {
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61 draggable: original,
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62 };
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63 original = null;
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64 dragging = null;
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65 dad.onDropped(droppedEvent);
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66 }
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67
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68 function start(event) {
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69 //console.log(event);
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70 original = dad.whatToDrag(event.target);
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71 dragging = original.cloneNode(true);
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72 original.setAttribute('dad-original','');
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73 dragging.setAttribute('dad-dragging','');
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74 let rect = original.getBoundingClientRect();
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75 dragging.style.left = `${rect.x}px`;
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76 dragging.style.top = `${rect.y}px`;
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77 original.parentNode.appendChild(dragging);
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3
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78 }
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79
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80 function onMouseDown(event) {
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81 start(event);
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82 document.addEventListener('mousemove',onMouseMove);
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83 document.addEventListener('mouseup',onMouseUp);
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84 }
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85
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86 function onTouchStart(event) {
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87 start(event);
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88 let touches = event.touches;
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89 if( touches.length !== 1 )
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90 return;
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91 let touch = touches[0];
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92 touchX = touch.clientX;
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93 touchY = touch.clientY;
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94 document.addEventListener('touchmove',onTouchMove);
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95 document.addEventListener('touchend',onMouseUp);
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96 }
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97
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98 dad.setDraggable = function(el) {
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99 el.setAttribute('dad-drag','');
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100 el.addEventListener('mousedown',onMouseDown);
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101 el.addEventListener('touchstart',onTouchStart);
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102 };
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103 }
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