gecko-dev/layout/xul/nsScrollbarButtonFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsINameSpaceManager.h"
#include "nsGkAtoms.h"
#include "nsSliderFrame.h"
#include "nsScrollbarFrame.h"
#include "nsIScrollbarMediator.h"
#include "nsRepeatService.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
using namespace mozilla;
//
// NS_NewToolbarFrame
//
// Creates a new Toolbar frame and returns it
//
nsIFrame*
NS_NewScrollbarButtonFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsScrollbarButtonFrame(aPresShell, aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarButtonFrame)
NS_IMETHODIMP
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->message) {
case NS_MOUSE_BUTTON_DOWN:
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 NS_MOUSE_BUTTON_UP:
HandleRelease(aPresContext, aEvent, aEventStatus);
break;
case NS_MOUSE_EXIT_SYNTH:
mCursorOnThis = false;
break;
case NS_MOUSE_MOVE: {
nsPoint cursor =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, this);
nsRect frameRect(nsPoint(0, 0), GetSize());
mCursorOnThis = frameRect.Contains(cursor);
break;
}
}
return nsButtonBoxFrame::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()->button;
if (button == WidgetMouseEvent::eLeftButton) {
tmpAction = LookAndFeel::eIntID_ScrollButtonLeftMouseButtonAction;
} else if (button == WidgetMouseEvent::eMiddleButton) {
tmpAction = LookAndFeel::eIntID_ScrollButtonMiddleMouseButtonAction;
} else if (button == WidgetMouseEvent::eRightButton) {
tmpAction = LookAndFeel::eIntID_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;
// get the scrollbars content node
nsIContent* content = scrollbar->GetContent();
static nsIContent::AttrValuesArray strings[] = { &nsGkAtoms::increment,
&nsGkAtoms::decrement,
nullptr };
int32_t index = mContent->FindAttrValueIn(kNameSpaceID_None,
nsGkAtoms::type,
strings, eCaseMatters);
int32_t direction;
if (index == 0)
direction = 1;
else if (index == 1)
direction = -1;
else
return false;
// Whether or not to repeat the click action.
bool repeat = true;
// Use smooth scrolling by default.
bool smoothScroll = true;
switch (pressedButtonAction) {
case 0:
mIncrement = direction * nsSliderFrame::GetIncrement(content);
break;
case 1:
mIncrement = direction * nsSliderFrame::GetPageIncrement(content);
break;
case 2:
if (direction == -1)
mIncrement = -nsSliderFrame::GetCurrentPosition(content);
else
mIncrement = nsSliderFrame::GetMaxPosition(content) -
nsSliderFrame::GetCurrentPosition(content);
// Don't repeat or use smooth scrolling if scrolling to beginning or end
// of a page.
repeat = smoothScroll = false;
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;
}
// set this attribute so we can style it later
nsWeakFrame weakFrame(this);
mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::active, NS_LITERAL_STRING("true"), true);
nsIPresShell::SetCapturingContent(mContent, CAPTURE_IGNOREALLOWED);
if (weakFrame.IsAlive()) {
DoButtonAction(smoothScroll);
}
if (repeat)
StartRepeat();
return true;
}
NS_IMETHODIMP
nsScrollbarButtonFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
nsIPresShell::SetCapturingContent(nullptr, 0);
// we're not active anymore
mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::active, true);
StopRepeat();
return NS_OK;
}
void nsScrollbarButtonFrame::Notify()
{
// Since this is only going to get called if we're scrolling a page length
// or a line increment, we will always use smooth scrolling.
if (mCursorOnThis ||
LookAndFeel::GetInt(
LookAndFeel::eIntID_ScrollbarButtonAutoRepeatBehavior, 0)) {
DoButtonAction(true);
}
}
void
nsScrollbarButtonFrame::MouseClicked(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent)
{
nsButtonBoxFrame::MouseClicked(aPresContext, aEvent);
//MouseClicked();
}
void
nsScrollbarButtonFrame::DoButtonAction(bool aSmoothScroll)
{
// get the scrollbar control
nsIFrame* scrollbar;
GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar);
if (scrollbar == nullptr)
return;
// get the scrollbars content node
nsCOMPtr<nsIContent> content = scrollbar->GetContent();
// get the current pos
int32_t curpos = nsSliderFrame::GetCurrentPosition(content);
int32_t oldpos = curpos;
// get the max pos
int32_t maxpos = nsSliderFrame::GetMaxPosition(content);
// increment the given amount
if (mIncrement)
curpos += mIncrement;
// make sure the current position is between the current and max positions
if (curpos < 0)
curpos = 0;
else if (curpos > maxpos)
curpos = maxpos;
nsScrollbarFrame* sb = do_QueryFrame(scrollbar);
if (sb) {
nsIScrollbarMediator* m = sb->GetScrollbarMediator();
if (m) {
m->ScrollbarButtonPressed(sb, oldpos, curpos);
return;
}
}
// set the current position of the slider.
nsAutoString curposStr;
curposStr.AppendInt(curpos);
if (aSmoothScroll)
content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);
content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, true);
if (aSmoothScroll)
content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
}
nsresult
nsScrollbarButtonFrame::GetChildWithTag(nsPresContext* aPresContext,
nsIAtom* atom, nsIFrame* start,
nsIFrame*& result)
{
// recursively search our children
nsIFrame* childFrame = start->GetFirstPrincipalChild();
while (nullptr != childFrame)
{
// get the content node
nsIContent* child = childFrame->GetContent();
if (child) {
// see if it is the child
if (child->Tag() == atom)
{
result = childFrame;
return NS_OK;
}
}
// recursive search the child
GetChildWithTag(aPresContext, atom, childFrame, result);
if (result != nullptr)
return NS_OK;
childFrame = childFrame->GetNextSibling();
}
result = nullptr;
return NS_OK;
}
nsresult
nsScrollbarButtonFrame::GetParentWithTag(nsIAtom* toFind, nsIFrame* start,
nsIFrame*& result)
{
while (start)
{
start = start->GetParent();
if (start) {
// get the content node
nsIContent* child = start->GetContent();
if (child && child->Tag() == toFind) {
result = start;
return NS_OK;
}
}
}
result = nullptr;
return NS_OK;
}
void
nsScrollbarButtonFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// 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();
nsButtonBoxFrame::DestroyFrom(aDestructRoot);
}