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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/webscrollbarbehavior_impl_gtkoraura.h"
#include "third_party/WebKit/public/platform/WebPoint.h"
#include "third_party/WebKit/public/platform/WebRect.h"
namespace content {
bool WebScrollbarBehaviorImpl::shouldCenterOnThumb(
blink::WebScrollbarBehavior::Button mouseButton,
bool shiftKeyPressed,
bool altKeyPressed) {
#if (defined(OS_LINUX) && !defined(OS_CHROMEOS))
if (mouseButton == blink::WebScrollbarBehavior::ButtonMiddle)
return true;
#endif
return (mouseButton == blink::WebScrollbarBehavior::ButtonLeft) &&
shiftKeyPressed;
}
bool WebScrollbarBehaviorImpl::shouldSnapBackToDragOrigin(
const blink::WebPoint& eventPoint,
const blink::WebRect& scrollbarRect,
bool isHorizontal) {
// Constants used to figure the drag rect outside which we should snap the
// scrollbar thumb back to its origin. These calculations are based on
// observing the behavior of the MSVC8 main window scrollbar + some
// guessing/extrapolation.
static const int kOffEndMultiplier = 3;
static const int kOffSideMultiplier = 8;
// Find the rect within which we shouldn't snap, by expanding the track rect
// in both dimensions.
gfx::Rect noSnapRect(scrollbarRect);
const int thickness = isHorizontal ? noSnapRect.height() : noSnapRect.width();
noSnapRect.Inset(
(isHorizontal ? kOffEndMultiplier : kOffSideMultiplier) * -thickness,
(isHorizontal ? kOffSideMultiplier : kOffEndMultiplier) * -thickness);
// We should snap iff the event is outside our calculated rect.
return !noSnapRect.Contains(eventPoint);
}
} // namespace content
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