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var box;
var boxX = 0, boxY = 0;
document.addEventListener( 'DOMContentLoaded', init, false );
function init() {
box = document.querySelector('#box');
// box.querySelector('a').addEventListener( 'click', onAMousedown, false );
// box.addEventListener( 'click', onClick, false );
box.addEventListener( 'mousedown', onMousedown, false );
}
// ----- ----- //
function onAMousedown( event ) {
console.log('on a mousedown');
event.preventDefault();
event.stopPropagation();
}
// ----- mouse ----- //
var mousedownX, mousedownY;
var dragStartX, dragStartY;
var dragStartBoxX, dragStartBoxY;
var mouseDownEvent;
function onMousedown( event ) {
mouseDownEvent = event;
event.preventDefault();
mousedownX = event.pageX;
mousedownY = event.pageY;
window.addEventListener( 'mousemove', onMousemove, false );
window.addEventListener( 'mouseup', onMouseup, false );
}
var isDragging = false;
function onMousemove( event ) {
// don't move until mouse has moved at least 3 pixels in any direction
var moveX = event.pageX - mousedownX;
var moveY = event.pageY - mousedownY;
var bigMove = Math.max( Math.abs( moveX ), Math.abs( moveY ) );
if ( !isDragging && bigMove > 3 ) {
mouseDownEvent.preventDefault();
mouseDownEvent.stopPropagation();
dragStartX = event.pageX;
dragStartY = event.pageY;
// position of box when drag started
dragStartBoxX = boxX;
dragStartBoxY = boxY;
isDragging = true;
}
if ( isDragging ) {
boxX = dragStartBoxX + ( event.pageX - dragStartX );
boxY = dragStartBoxY + ( event.pageY - dragStartY );
box.style.left = boxX + 'px';
box.style.top = boxY + 'px';
}
}
function onMouseup() {
if ( !isDragging ) {
console.log('non drag click');
}
isDragging = false;
window.removeEventListener( 'mousemove', onMousemove, false );
window.removeEventListener( 'mouseup', onMouseup, false );
}
// ----- click ----- //
function onClick() {
console.log('click');
}
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