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@zcorpan zcorpan/nav.js forked from tobie/nav.js
Last active Feb 10, 2017

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"use strict";
(function(global) {
var CSS_TEXT = "float: left; padding: 5px 15px; border-left: 1px solid #999; cursor: pointer;"
var CSS_BORDER = "outline: 2px dashed #00F";
var container = document.createElement("div");
var display = document.createElement("div");
var previous = document.createElement("div");
var next = document.createElement("div");
var position = document.createElement("span");
display.appendChild(position);
container.appendChild(display);
container.appendChild(previous);
container.appendChild(next);
document.body.appendChild(container);
container.className = "";
container.style.cssText = "background-image: linear-gradient(transparent,rgba(0,0,0,.05) 40%,rgba(0,0,0,.1)); font: 12px sans-serif; color: #666; border-top: 1px solid #999; border-right: 1px solid #999; border-left: 1px solid #999; position: fixed; bottom: 0; right: 25px; border-radius: 3px 3px 0 0; background-color: #eee; z-index: 2147483647;"
next.style.cssText = CSS_TEXT;
previous.style.cssText = CSS_TEXT;
display.style.cssText = "float: left; padding: 5px 5px;"
position.style.cssText = "background-color: #fff; border: 1px solid #999; padding: 1px 5px; box-shadow: inset 0 1px 3px #ddd; border-radius: 2px"
next.textContent = "next ›";
next.title = "Keyboard nav: use \"j\" to jump to next change."
previous.textContent = "‹ previous";
previous.title = "Keyboard nav: use \"k\" to jump to previous change."
function State(changes) {
changes = Array.prototype.slice.call(changes, 0);
var index = -1;
var length = changes.length;
return {
index: function() {
return index + 1;
},
size: function() {
return length;
},
current: function() {
return changes[index];
},
previous: function() {
index--;
if (index < 0) {
index = length-1;
}
return changes[index];
},
next: function() {
index++;
if (index >= length) {
index = 0;
}
return changes[index];
},
none: function() {
index = -1;
}
}
}
function init(elements) {
var current = null;
var state = new State(elements);
function update(state) {
position.textContent = state.index() + " of " + state.size();
}
function onnext(e) {
if (current) {
current.style.cssText = "";
}
current = state.next();
current.style.cssText = CSS_BORDER;
current.scrollIntoView();
update(state);
}
function onprevious(e) {
if (current) {
current.style.cssText = "";
}
current = state.previous();
current.style.cssText = CSS_BORDER;
current.scrollIntoView();
update(state);
}
function onstop(e) {
if (current) {
current.style.cssText = "";
}
state.none();
current = null;
update(state);
}
next.onclick = onnext;
previous.onclick = onprevious;
document.addEventListener("keydown", function (e) {
if (!e.metaKey && e.keyCode == 74) {
onnext(e)
} else if (!e.metaKey && e.keyCode == 75) {
onprevious(e)
} else if (!e.metaKey && e.keyCode == 27) {
onstop(e)
}
}, false);
update(state);
}
var diffs = document.querySelectorAll("del.diff-old, ins.diff-chg, ins.diff-new");
diffs = Array.prototype.filter.call(diffs, function(e) {
return e.offsetWidth || e.offsetHeight || e.getClientRects().length;
});
init(diffs);
})(window);
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