tenfourfox/layout/base/AccessibleCaret.cpp

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2017-04-19 07:56:45 +00:00
/* -*- 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/. */
#include "AccessibleCaret.h"
#include "AccessibleCaretLogger.h"
#include "mozilla/Preferences.h"
#include "mozilla/ToString.h"
#include "nsCanvasFrame.h"
#include "nsCaret.h"
#include "nsDOMTokenList.h"
#include "nsIFrame.h"
namespace mozilla {
using namespace dom;
#undef AC_LOG
#define AC_LOG(message, ...) \
AC_LOG_BASE("AccessibleCaret (%p): " message, this, ##__VA_ARGS__);
#undef AC_LOGV
#define AC_LOGV(message, ...) \
AC_LOGV_BASE("AccessibleCaret (%p): " message, this, ##__VA_ARGS__);
NS_IMPL_ISUPPORTS(AccessibleCaret::DummyTouchListener, nsIDOMEventListener)
float AccessibleCaret::sWidth = 0.0f;
float AccessibleCaret::sHeight = 0.0f;
float AccessibleCaret::sMarginLeft = 0.0f;
float AccessibleCaret::sBarWidth = 0.0f;
#define AC_PROCESS_ENUM_TO_STREAM(e) case(e): aStream << #e; break;
std::ostream&
operator<<(std::ostream& aStream, const AccessibleCaret::Appearance& aAppearance)
{
using Appearance = AccessibleCaret::Appearance;
switch (aAppearance) {
AC_PROCESS_ENUM_TO_STREAM(Appearance::None);
AC_PROCESS_ENUM_TO_STREAM(Appearance::Normal);
AC_PROCESS_ENUM_TO_STREAM(Appearance::NormalNotShown);
AC_PROCESS_ENUM_TO_STREAM(Appearance::Left);
AC_PROCESS_ENUM_TO_STREAM(Appearance::Right);
}
return aStream;
}
std::ostream&
operator<<(std::ostream& aStream,
const AccessibleCaret::PositionChangedResult& aResult)
{
using PositionChangedResult = AccessibleCaret::PositionChangedResult;
switch (aResult) {
AC_PROCESS_ENUM_TO_STREAM(PositionChangedResult::NotChanged);
AC_PROCESS_ENUM_TO_STREAM(PositionChangedResult::Changed);
AC_PROCESS_ENUM_TO_STREAM(PositionChangedResult::Invisible);
}
return aStream;
}
#undef AC_PROCESS_ENUM_TO_STREAM
// -----------------------------------------------------------------------------
// Implementation of AccessibleCaret methods
AccessibleCaret::AccessibleCaret(nsIPresShell* aPresShell)
: mPresShell(aPresShell)
{
// Check all resources required.
if (mPresShell) {
MOZ_ASSERT(RootFrame());
MOZ_ASSERT(mPresShell->GetDocument());
MOZ_ASSERT(mPresShell->GetCanvasFrame());
MOZ_ASSERT(mPresShell->GetCanvasFrame()->GetCustomContentContainer());
InjectCaretElement(mPresShell->GetDocument());
}
static bool prefsAdded = false;
if (!prefsAdded) {
Preferences::AddFloatVarCache(&sWidth, "layout.accessiblecaret.width");
Preferences::AddFloatVarCache(&sHeight, "layout.accessiblecaret.height");
Preferences::AddFloatVarCache(&sMarginLeft, "layout.accessiblecaret.margin-left");
Preferences::AddFloatVarCache(&sBarWidth, "layout.accessiblecaret.bar.width");
prefsAdded = true;
}
}
AccessibleCaret::~AccessibleCaret()
{
if (mPresShell) {
RemoveCaretElement(mPresShell->GetDocument());
}
}
void
AccessibleCaret::SetAppearance(Appearance aAppearance)
{
if (mAppearance == aAppearance) {
return;
}
ErrorResult rv;
CaretElement()->ClassList()->Remove(AppearanceString(mAppearance), rv);
MOZ_ASSERT(!rv.Failed(), "Remove old appearance failed!");
CaretElement()->ClassList()->Add(AppearanceString(aAppearance), rv);
MOZ_ASSERT(!rv.Failed(), "Add new appearance failed!");
AC_LOG("%s: %s -> %s", __FUNCTION__, ToString(mAppearance).c_str(),
ToString(aAppearance).c_str());
mAppearance = aAppearance;
// Need to reset rect since the cached rect will be compared in SetPosition.
if (mAppearance == Appearance::None) {
mImaginaryCaretRect = nsRect();
}
}
void
AccessibleCaret::SetSelectionBarEnabled(bool aEnabled)
{
if (mSelectionBarEnabled == aEnabled) {
return;
}
AC_LOG("Set selection bar %s", __FUNCTION__, aEnabled ? "Enabled" : "Disabled");
ErrorResult rv;
CaretElement()->ClassList()->Toggle(NS_LITERAL_STRING("no-bar"),
Optional<bool>(!aEnabled), rv);
MOZ_ASSERT(!rv.Failed());
mSelectionBarEnabled = aEnabled;
}
/* static */ nsString
AccessibleCaret::AppearanceString(Appearance aAppearance)
{
nsAutoString string;
switch (aAppearance) {
case Appearance::None:
case Appearance::NormalNotShown:
string = NS_LITERAL_STRING("none");
break;
case Appearance::Normal:
string = NS_LITERAL_STRING("normal");
break;
case Appearance::Right:
string = NS_LITERAL_STRING("right");
break;
case Appearance::Left:
string = NS_LITERAL_STRING("left");
break;
}
return string;
}
bool
AccessibleCaret::Intersects(const AccessibleCaret& aCaret) const
{
MOZ_ASSERT(mPresShell == aCaret.mPresShell);
if (!IsVisuallyVisible() || !aCaret.IsVisuallyVisible()) {
return false;
}
nsRect rect = nsLayoutUtils::GetRectRelativeToFrame(CaretElement(), RootFrame());
nsRect rhsRect = nsLayoutUtils::GetRectRelativeToFrame(aCaret.CaretElement(), RootFrame());
return rect.Intersects(rhsRect);
}
bool
AccessibleCaret::Contains(const nsPoint& aPoint) const
{
if (!IsVisuallyVisible()) {
return false;
}
nsRect rect =
nsLayoutUtils::GetRectRelativeToFrame(CaretImageElement(), RootFrame());
return rect.Contains(aPoint);
}
void
AccessibleCaret::InjectCaretElement(nsIDocument* aDocument)
{
ErrorResult rv;
nsCOMPtr<Element> element = CreateCaretElement(aDocument);
mCaretElementHolder = aDocument->InsertAnonymousContent(*element, rv);
MOZ_ASSERT(!rv.Failed(), "Insert anonymous content should not fail!");
MOZ_ASSERT(mCaretElementHolder.get(), "We must have anonymous content!");
// InsertAnonymousContent will clone the element to make an AnonymousContent.
// Since event listeners are not being cloned when cloning a node, we need to
// add the listener here.
CaretElement()->AddEventListener(NS_LITERAL_STRING("touchstart"),
mDummyTouchListener, false);
}
already_AddRefed<Element>
AccessibleCaret::CreateCaretElement(nsIDocument* aDocument) const
{
// Content structure of AccessibleCaret
// <div class="moz-accessiblecaret"> <- CaretElement()
// <div class="image"> <- CaretImageElement()
// <div class="bar"> <- SelectionBarElement()
ErrorResult rv;
nsCOMPtr<Element> parent = aDocument->CreateHTMLElement(nsGkAtoms::div);
parent->ClassList()->Add(NS_LITERAL_STRING("moz-accessiblecaret"), rv);
parent->ClassList()->Add(NS_LITERAL_STRING("none"), rv);
parent->ClassList()->Add(NS_LITERAL_STRING("no-bar"), rv);
nsCOMPtr<Element> image = aDocument->CreateHTMLElement(nsGkAtoms::div);
image->ClassList()->Add(NS_LITERAL_STRING("image"), rv);
parent->AppendChildTo(image, false);
nsCOMPtr<Element> bar = aDocument->CreateHTMLElement(nsGkAtoms::div);
bar->ClassList()->Add(NS_LITERAL_STRING("bar"), rv);
parent->AppendChildTo(bar, false);
return parent.forget();
}
void
AccessibleCaret::RemoveCaretElement(nsIDocument* aDocument)
{
CaretElement()->RemoveEventListener(NS_LITERAL_STRING("touchstart"),
mDummyTouchListener, false);
ErrorResult rv;
aDocument->RemoveAnonymousContent(*mCaretElementHolder, rv);
// It's OK rv is failed since nsCanvasFrame might not exists now.
rv.SuppressException();
}
AccessibleCaret::PositionChangedResult
AccessibleCaret::SetPosition(nsIFrame* aFrame, int32_t aOffset)
{
if (!CustomContentContainerFrame()) {
return PositionChangedResult::NotChanged;
}
nsRect imaginaryCaretRectInFrame =
nsCaret::GetGeometryForFrame(aFrame, aOffset, nullptr);
imaginaryCaretRectInFrame =
nsLayoutUtils::ClampRectToScrollFrames(aFrame, imaginaryCaretRectInFrame);
if (imaginaryCaretRectInFrame.IsEmpty()) {
// Don't bother to set the caret position since it's invisible.
mImaginaryCaretRect = nsRect();
return PositionChangedResult::Invisible;
}
nsRect imaginaryCaretRect = imaginaryCaretRectInFrame;
nsLayoutUtils::TransformRect(aFrame, RootFrame(), imaginaryCaretRect);
if (imaginaryCaretRect.IsEqualEdges(mImaginaryCaretRect)) {
return PositionChangedResult::NotChanged;
}
mImaginaryCaretRect = imaginaryCaretRect;
// SetCaretElementStyle() and SetSelectionBarElementStyle() require the
// input rect relative to container frame.
nsRect imaginaryCaretRectInContainerFrame = imaginaryCaretRectInFrame;
nsLayoutUtils::TransformRect(aFrame, CustomContentContainerFrame(),
imaginaryCaretRectInContainerFrame);
SetCaretElementStyle(imaginaryCaretRectInContainerFrame);
SetSelectionBarElementStyle(imaginaryCaretRectInContainerFrame);
return PositionChangedResult::Changed;
}
nsIFrame*
AccessibleCaret::CustomContentContainerFrame() const
{
nsCanvasFrame* canvasFrame = mPresShell->GetCanvasFrame();
Element* container = canvasFrame->GetCustomContentContainer();
nsIFrame* containerFrame = container->GetPrimaryFrame();
return containerFrame;
}
void
AccessibleCaret::SetCaretElementStyle(const nsRect& aRect)
{
nsPoint position = CaretElementPosition(aRect);
nsAutoString styleStr;
styleStr.AppendPrintf("left: %dpx; top: %dpx; padding-top: %dpx;",
nsPresContext::AppUnitsToIntCSSPixels(position.x),
nsPresContext::AppUnitsToIntCSSPixels(position.y),
nsPresContext::AppUnitsToIntCSSPixels(aRect.height));
float zoomLevel = GetZoomLevel();
styleStr.AppendPrintf(" width: %.2fpx; height: %.2fpx; margin-left: %.2fpx",
sWidth / zoomLevel,
sHeight / zoomLevel,
sMarginLeft / zoomLevel);
ErrorResult rv;
CaretElement()->SetAttribute(NS_LITERAL_STRING("style"), styleStr, rv);
MOZ_ASSERT(!rv.Failed());
AC_LOG("Set caret style: %s", NS_ConvertUTF16toUTF8(styleStr).get());
}
void
AccessibleCaret::SetSelectionBarElementStyle(const nsRect& aRect)
{
int32_t height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
nsAutoString barStyleStr;
barStyleStr.AppendPrintf("margin-top: -%dpx; height: %dpx;",
height, height);
float zoomLevel = GetZoomLevel();
barStyleStr.AppendPrintf(" width: %.2fpx;", sBarWidth / zoomLevel);
ErrorResult rv;
SelectionBarElement()->SetAttribute(NS_LITERAL_STRING("style"), barStyleStr, rv);
MOZ_ASSERT(!rv.Failed());
AC_LOG("Set bar style: %s", NS_ConvertUTF16toUTF8(barStyleStr).get());
}
float
AccessibleCaret::GetZoomLevel()
{
// Full zoom on desktop.
float fullZoom = mPresShell->GetPresContext()->GetFullZoom();
// Pinch-zoom on B2G.
float resolution = mPresShell->GetCumulativeResolution();
return fullZoom * resolution;
}
} // namespace mozilla