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/**
* (C) Copyright 2009 John J. Foerch
*
* Use, modification, and distribution are subject to the terms specified in the
* COPYING file.
**/
/*
* Example usage:
*
* require('eye-guide.js');
* define_key(content_buffer_normal_keymap, "space", "eye-guide-scroll-down");
* define_key(content_buffer_normal_keymap, "back_space", "eye-guide-scroll-up");
*
*/
define_variable("eye_guide_interval", 800,
"Interval during which the eye guide is visible (in ms). "+
"When 0, the eye guide will remain visible.");
define_variable("eye_guide_context_size", 50,
"Context size in pixels for eye-guide-scroll-down and "+
"eye-guide-scroll-up.");
define_variable("eye_guide_highlight_new", false,
"Highlight the new contents of the screen, instead of the old.");
define_variable("eye_guide_on_image_buffers", true,
"Enable eye guide on image-only buffers.");
function eye_guide_scroll (buffer, scroll_down, hl_new, context, interval) {
let win = buffer.focused_frame;
let doc = win.document;
let scroll_amount = win.innerHeight - context;
let old_y = win.scrollY;
win.scrollBy(0, scroll_down ? scroll_amount : -scroll_amount);
if (win.scrollY == old_y)
return;
if (!eye_guide_on_image_buffers && doc instanceof Ci.nsIImageDocument) {
return;
}
if (Math.abs(win.scrollY - old_y) < scroll_amount)
context = win.innerHeight - (scroll_down ? win.scrollY - old_y : old_y);
let guide = doc.getElementById("__conkeror_eye_guide");
if (! guide) {
guide = doc.createElementNS(XHTML_NS, "div");
guide.id = "__conkeror_eye_guide";
doc.documentElement.appendChild(guide);
}
if (hl_new) {
guide.style.top = scroll_down ? context + "px" : "0px";
guide.style.height = (win.innerHeight - context) + "px";
} else {
guide.style.top = scroll_down ? "0px"
: (win.innerHeight - context) + "px";
guide.style.height = context + "px";
}
guide.style.display = "block";
guide.className =
"__conkeror_eye_guide_scroll_" + (scroll_down ? "down" : "up");
if (win.eye_guide_timer) {
win.clearTimeout(win.eye_guide_timer);
win.eye_guide_timer = null;
}
if (interval != 0) {
win.eye_guide_timer = win.setTimeout(
function () {
guide.style.display = "none";
},
interval);
}
}
interactive("eye-guide-scroll-down",
"Alternative to scroll-page-down, displays a guide to help "+
"your eyes follow the scroll.",
function (I) {
eye_guide_scroll(I.buffer, true, eye_guide_highlight_new,
eye_guide_context_size, eye_guide_interval);
});
interactive("eye-guide-scroll-up",
"Alternative to scroll-page-up, displays a guide to help "+
"your eyes follow the scroll.",
function (I) {
eye_guide_scroll(I.buffer, false, eye_guide_highlight_new,
eye_guide_context_size, eye_guide_interval);
});
provide("eye-guide");
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