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Diffstat (limited to 'layout/xul/nsScrollbarButtonFrame.cpp')
| -rw-r--r-- | layout/xul/nsScrollbarButtonFrame.cpp | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/layout/xul/nsScrollbarButtonFrame.cpp b/layout/xul/nsScrollbarButtonFrame.cpp new file mode 100644 index 0000000000..176c0ec09d --- /dev/null +++ b/layout/xul/nsScrollbarButtonFrame.cpp @@ -0,0 +1,274 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// +// Eric Vaughan +// Netscape Communications +// +// See documentation in associated header file +// + +#include "nsScrollbarButtonFrame.h" +#include "nsPresContext.h" +#include "nsIContent.h" +#include "nsCOMPtr.h" +#include "nsNameSpaceManager.h" +#include "nsGkAtoms.h" +#include "nsLayoutUtils.h" +#include "nsSliderFrame.h" +#include "nsScrollbarFrame.h" +#include "nsIScrollbarMediator.h" +#include "nsRepeatService.h" +#include "mozilla/LookAndFeel.h" +#include "mozilla/MouseEvents.h" +#include "mozilla/PresShell.h" +#include "mozilla/Telemetry.h" + +using namespace mozilla; + +// +// NS_NewToolbarFrame +// +// Creates a new Toolbar frame and returns it +// +nsIFrame* NS_NewScrollbarButtonFrame(PresShell* aPresShell, + ComputedStyle* aStyle) { + return new (aPresShell) + nsScrollbarButtonFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarButtonFrame) + +nsresult nsScrollbarButtonFrame::HandleEvent(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + NS_ENSURE_ARG_POINTER(aEventStatus); + + // If a web page calls event.preventDefault() we still want to + // scroll when scroll arrow is clicked. See bug 511075. + if (!mContent->IsInNativeAnonymousSubtree() && + nsEventStatus_eConsumeNoDefault == *aEventStatus) { + return NS_OK; + } + + switch (aEvent->mMessage) { + case eMouseDown: + mCursorOnThis = true; + // if we didn't handle the press ourselves, pass it on to the superclass + if (HandleButtonPress(aPresContext, aEvent, aEventStatus)) { + return NS_OK; + } + break; + case eMouseUp: + HandleRelease(aPresContext, aEvent, aEventStatus); + break; + case eMouseOut: + mCursorOnThis = false; + break; + case eMouseMove: { + nsPoint cursor = nsLayoutUtils::GetEventCoordinatesRelativeTo( + aEvent, RelativeTo{this}); + nsRect frameRect(nsPoint(0, 0), GetSize()); + mCursorOnThis = frameRect.Contains(cursor); + break; + } + default: + break; + } + + return nsBoxFrame::HandleEvent(aPresContext, aEvent, aEventStatus); +} + +bool nsScrollbarButtonFrame::HandleButtonPress(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + // Get the desired action for the scrollbar button. + LookAndFeel::IntID tmpAction; + uint16_t button = aEvent->AsMouseEvent()->mButton; + if (button == MouseButton::ePrimary) { + tmpAction = LookAndFeel::IntID::ScrollButtonLeftMouseButtonAction; + } else if (button == MouseButton::eMiddle) { + tmpAction = LookAndFeel::IntID::ScrollButtonMiddleMouseButtonAction; + } else if (button == MouseButton::eSecondary) { + tmpAction = LookAndFeel::IntID::ScrollButtonRightMouseButtonAction; + } else { + return false; + } + + // Get the button action metric from the pres. shell. + int32_t pressedButtonAction; + if (NS_FAILED(LookAndFeel::GetInt(tmpAction, &pressedButtonAction))) { + return false; + } + + // get the scrollbar control + nsIFrame* scrollbar; + GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar); + + if (scrollbar == nullptr) return false; + + static dom::Element::AttrValuesArray strings[] = { + nsGkAtoms::increment, nsGkAtoms::decrement, nullptr}; + int32_t index = mContent->AsElement()->FindAttrValueIn( + kNameSpaceID_None, nsGkAtoms::type, strings, eCaseMatters); + int32_t direction; + if (index == 0) + direction = 1; + else if (index == 1) + direction = -1; + else + return false; + + bool repeat = pressedButtonAction != 2; + // set this attribute so we can style it later + AutoWeakFrame weakFrame(this); + mContent->AsElement()->SetAttr(kNameSpaceID_None, nsGkAtoms::active, + u"true"_ns, true); + + PresShell::SetCapturingContent(mContent, CaptureFlags::IgnoreAllowedState); + + if (!weakFrame.IsAlive()) { + return false; + } + + if (nsScrollbarFrame* sb = do_QueryFrame(scrollbar)) { + nsIScrollbarMediator* m = sb->GetScrollbarMediator(); + switch (pressedButtonAction) { + case 0: + sb->SetIncrementToLine(direction); + if (m) { + m->ScrollByLine(sb, direction, ScrollSnapFlags::IntendedDirection); + } + break; + case 1: + sb->SetIncrementToPage(direction); + if (m) { + m->ScrollByPage(sb, direction, + ScrollSnapFlags::IntendedDirection | + ScrollSnapFlags::IntendedEndPosition); + } + break; + case 2: + sb->SetIncrementToWhole(direction); + if (m) { + m->ScrollByWhole(sb, direction, ScrollSnapFlags::IntendedEndPosition); + } + break; + case 3: + default: + // We were told to ignore this click, or someone assigned a non-standard + // value to the button's action. + return false; + } + if (!weakFrame.IsAlive()) { + return false; + } + + if (!m) { + sb->MoveToNewPosition(nsScrollbarFrame::ImplementsScrollByUnit::No); + if (!weakFrame.IsAlive()) { + return false; + } + } + } + if (repeat) { + StartRepeat(); + } + return true; +} + +NS_IMETHODIMP +nsScrollbarButtonFrame::HandleRelease(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + PresShell::ReleaseCapturingContent(); + // we're not active anymore + mContent->AsElement()->UnsetAttr(kNameSpaceID_None, nsGkAtoms::active, true); + StopRepeat(); + nsIFrame* scrollbar; + GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar); + nsScrollbarFrame* sb = do_QueryFrame(scrollbar); + if (sb) { + nsIScrollbarMediator* m = sb->GetScrollbarMediator(); + if (m) { + m->ScrollbarReleased(sb); + } + } + return NS_OK; +} + +void nsScrollbarButtonFrame::Notify() { + if (mCursorOnThis || + LookAndFeel::GetInt(LookAndFeel::IntID::ScrollbarButtonAutoRepeatBehavior, + 0)) { + // get the scrollbar control + nsIFrame* scrollbar; + GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar); + nsScrollbarFrame* sb = do_QueryFrame(scrollbar); + if (sb) { + nsIScrollbarMediator* m = sb->GetScrollbarMediator(); + if (m) { + m->RepeatButtonScroll(sb); + } else { + sb->MoveToNewPosition(nsScrollbarFrame::ImplementsScrollByUnit::No); + } + } + } +} + +nsresult nsScrollbarButtonFrame::GetChildWithTag(nsAtom* atom, nsIFrame* start, + nsIFrame*& result) { + // recursively search our children + for (nsIFrame* childFrame : start->PrincipalChildList()) { + // get the content node + nsIContent* child = childFrame->GetContent(); + + if (child) { + // see if it is the child + if (child->IsXULElement(atom)) { + result = childFrame; + + return NS_OK; + } + } + + // recursive search the child + GetChildWithTag(atom, childFrame, result); + if (result != nullptr) return NS_OK; + } + + result = nullptr; + return NS_OK; +} + +nsresult nsScrollbarButtonFrame::GetParentWithTag(nsAtom* toFind, + nsIFrame* start, + nsIFrame*& result) { + while (start) { + start = start->GetParent(); + + if (start) { + // get the content node + nsIContent* child = start->GetContent(); + + if (child && child->IsXULElement(toFind)) { + result = start; + return NS_OK; + } + } + } + + result = nullptr; + return NS_OK; +} + +void nsScrollbarButtonFrame::DestroyFrom(nsIFrame* aDestructRoot, + PostDestroyData& aPostDestroyData) { + // Ensure our repeat service isn't going... it's possible that a scrollbar can + // disappear out from under you while you're in the process of scrolling. + StopRepeat(); + nsBoxFrame::DestroyFrom(aDestructRoot, aPostDestroyData); +} |