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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 this 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
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11
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12 let original = null;
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13 let dragging = null;
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14 let touchX, touchY;
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15
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16 function onMouseMove(event) {
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17 //console.log(event);
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18 event.preventDefault();
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19 let rect = dragging.getBoundingClientRect();
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20 dragging.style.left = `${rect.x+event.movementX}px`;
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21 let y = rect.y + event.movementY;
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22 if( y < 0 ) {
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23 window.scrollBy( 0, y );
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24 } else if( y + rect.height > window.innerHeight ) {
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25 window.scrollBy( 0, y + rect.height - window.innerHeight );
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26 }
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27 dragging.style.top = `${y}px`;
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28 }
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29
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30 function onTouchMove(event) {
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31 let touches = event.touches;
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32 if( touches.length !== 1 )
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33 return;
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34 let touch = touches[0];
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35 let x = touch.clientX;
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36 let y = touch.clientY;
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37 event.movementX = x - touchX;
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38 event.movementY = y - touchY;
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39 touchX = x;
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40 touchY = y;
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41 onMouseMove(event);
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42 }
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43
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44 function onMouseUp(event) {
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45 //console.log(event);
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46 original.removeAttribute('dad-original');
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47 document.body.removeChild(dragging);
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48 document.removeEventListener('mousemove',onMouseMove);
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49 document.removeEventListener('mouseup',onMouseUp);
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50 document.removeEventListener('mousemove',onMouseMove);
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51 document.removeEventListener('touchend',onMouseUp);
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52 original.scrollIntoViewIfNeeded(false);
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53 original = null;
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54 dragging = null;
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55 }
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56
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57 function start(event) {
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58 //console.log(event);
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59 original = dad.whatToDrag(event.target);
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60 dragging = original.cloneNode(true);
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61 original.setAttribute('dad-original','');
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62 dragging.setAttribute('dad-dragging','');
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63 let rect = original.getBoundingClientRect();
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64 dragging.style.left = `${rect.x}px`;
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65 dragging.style.top = `${rect.y}px`;
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66 document.body.appendChild(dragging);
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67 }
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68
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69 function onMouseDown(event) {
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70 start(event);
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71 document.addEventListener('mousemove',onMouseMove);
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72 document.addEventListener('mouseup',onMouseUp);
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73 }
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74
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75 function onTouchStart(event) {
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76 start(event);
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77 let touches = event.touches;
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78 if( touches.length !== 1 )
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79 return;
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80 let touch = touches[0];
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81 touchX = touch.clientX;
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82 touchY = touch.clientY;
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83 document.addEventListener('touchmove',onTouchMove);
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84 document.addEventListener('touchend',onMouseUp);
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85 }
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86
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87 dad.setDraggable = function(el) {
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88 el.setAttribute('dad-drag','');
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89 el.addEventListener('mousedown',onMouseDown);
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90 el.addEventListener('touchstart',onTouchStart);
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91 };
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92 }
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