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Bug 321447 Allow slower minimum speed for autoscroll

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r=db48x sr=neil
This commit is contained in:
cst%andrew.cmu.edu 2006-03-07 13:50:00 +00:00
parent b09e1cc602
commit dcd6678c11
1 changed files with 36 additions and 6 deletions
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42
xpfe/communicator/resources/content/utilityOverlay.js
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@ -1,4 +1,4 @@
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
@ -578,6 +578,8 @@ var gScrollingView;
var gAutoScrollTimer;
var gIgnoreMouseEvents;
var gAutoScrollPopup = null;
var gAccumulatedScrollErrorX;
var gAccumulatedScrollErrorY;
function startScrolling(event)
{
@ -630,6 +632,8 @@ function startScrolling(event)
addEventListener('mouseup', handleMouseUpDown, true);
addEventListener('mousedown', handleMouseUpDown, true);
gAutoScrollTimer = setInterval(autoScrollLoop, 10);
gAccumulatedScrollErrorX = 0;
gAccumulatedScrollErrorY = 0;
}
function handleMouseMove(event)
@ -638,14 +642,40 @@ function handleMouseMove(event)
gCurrY = event.screenY;
}
function roundToZero(num)
{
if (num > 0)
return Math.floor(num);
return Math.ceil(num);
}
function accelerate(curr, start)
{
var speed = 12;
var val = (curr - start) / speed;
if (val > 1)
return val * Math.sqrt(val) - 1;
if (val < -1)
return val * Math.sqrt(-val) + 1;
return 0;
}
function autoScrollLoop()
{
var x = gCurrX - gStartX;
var y = gCurrY - gStartY;
const speed = 4;
if (Math.abs(x) >= speed || Math.abs(y) >= speed)
var x = accelerate(gCurrX, gStartX);
var y = accelerate(gCurrY, gStartY);
if (x || y)
gIgnoreMouseEvents = false;
gScrollingView.scrollBy(x / speed, y / speed);
var desiredScrollX = gAccumulatedScrollErrorX + x;
var actualScrollX = roundToZero(desiredScrollX);
gAccumulatedScrollErrorX = (desiredScrollX - actualScrollX);
var desiredScrollY = gAccumulatedScrollErrorY + y;
var actualScrollY = roundToZero(desiredScrollY);
gAccumulatedScrollErrorY = (desiredScrollY - actualScrollY);
gScrollingView.scrollBy(actualScrollX, actualScrollY);
}
function handleMouseUpDown(event)