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import * as DOM from '../lib/dom';
import updateGeometry from '../update-geometry';
import { isEditable } from '../lib/util';
export default function(i) {
const element = i.element;
const elementHovered = () => DOM.matches(element, ':hover');
const scrollbarFocused = () =>
DOM.matches(i.scrollbarX, ':focus') || DOM.matches(i.scrollbarY, ':focus');
function shouldPreventDefault(deltaX, deltaY) {
const scrollTop = Math.floor(element.scrollTop);
if (deltaX === 0) {
if (!i.scrollbarYActive) {
return false;
}
if (
(scrollTop === 0 && deltaY > 0) ||
(scrollTop >= i.contentHeight - i.containerHeight && deltaY < 0)
) {
return !i.settings.wheelPropagation;
}
}
const scrollLeft = element.scrollLeft;
if (deltaY === 0) {
if (!i.scrollbarXActive) {
return false;
}
if (
(scrollLeft === 0 && deltaX < 0) ||
(scrollLeft >= i.contentWidth - i.containerWidth && deltaX > 0)
) {
return !i.settings.wheelPropagation;
}
}
return true;
}
i.event.bind(i.ownerDocument, 'keydown', e => {
if (
(e.isDefaultPrevented && e.isDefaultPrevented()) ||
e.defaultPrevented
) {
return;
}
if (!elementHovered() && !scrollbarFocused()) {
return;
}
let activeElement = document.activeElement
? document.activeElement
: i.ownerDocument.activeElement;
if (activeElement) {
if (activeElement.tagName === 'IFRAME') {
activeElement = activeElement.contentDocument.activeElement;
} else {
// go deeper if element is a webcomponent
while (activeElement.shadowRoot) {
activeElement = activeElement.shadowRoot.activeElement;
}
}
if (isEditable(activeElement)) {
return;
}
}
let deltaX = 0;
let deltaY = 0;
switch (e.which) {
case 37: // left
if (e.metaKey) {
deltaX = -i.contentWidth;
} else if (e.altKey) {
deltaX = -i.containerWidth;
} else {
deltaX = -30;
}
break;
case 38: // up
if (e.metaKey) {
deltaY = i.contentHeight;
} else if (e.altKey) {
deltaY = i.containerHeight;
} else {
deltaY = 30;
}
break;
case 39: // right
if (e.metaKey) {
deltaX = i.contentWidth;
} else if (e.altKey) {
deltaX = i.containerWidth;
} else {
deltaX = 30;
}
break;
case 40: // down
if (e.metaKey) {
deltaY = -i.contentHeight;
} else if (e.altKey) {
deltaY = -i.containerHeight;
} else {
deltaY = -30;
}
break;
case 32: // space bar
if (e.shiftKey) {
deltaY = i.containerHeight;
} else {
deltaY = -i.containerHeight;
}
break;
case 33: // page up
deltaY = i.containerHeight;
break;
case 34: // page down
deltaY = -i.containerHeight;
break;
case 36: // home
deltaY = i.contentHeight;
break;
case 35: // end
deltaY = -i.contentHeight;
break;
default:
return;
}
if (i.settings.suppressScrollX && deltaX !== 0) {
return;
}
if (i.settings.suppressScrollY && deltaY !== 0) {
return;
}
element.scrollTop -= deltaY;
element.scrollLeft += deltaX;
updateGeometry(i);
if (shouldPreventDefault(deltaX, deltaY)) {
e.preventDefault();
}
});
}