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// Copyright 2018 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 "third_party/blink/renderer/core/css/style_environment_variables.h"
#include "third_party/blink/renderer/core/css/parser/css_tokenizer.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
namespace {
// This is the default value for all safe-area-inset-* variables.
static const char kSafeAreaInsetDefault[] = "0px";
// This is the default value for all keyboard-inset-* variables.
static const char kKeyboardInsetDefault[] = "0px";
// Use this to set default values for environment variables when the root
// instance is created.
void SetDefaultEnvironmentVariables(StyleEnvironmentVariables* instance) {
instance->SetVariable(UADefinedVariable::kSafeAreaInsetTop,
kSafeAreaInsetDefault);
instance->SetVariable(UADefinedVariable::kSafeAreaInsetLeft,
kSafeAreaInsetDefault);
instance->SetVariable(UADefinedVariable::kSafeAreaInsetBottom,
kSafeAreaInsetDefault);
instance->SetVariable(UADefinedVariable::kSafeAreaInsetRight,
kSafeAreaInsetDefault);
if (RuntimeEnabledFeatures::VirtualKeyboardEnabled()) {
instance->SetVariable(UADefinedVariable::kKeyboardInsetTop,
kKeyboardInsetDefault);
instance->SetVariable(UADefinedVariable::kKeyboardInsetLeft,
kKeyboardInsetDefault);
instance->SetVariable(UADefinedVariable::kKeyboardInsetBottom,
kKeyboardInsetDefault);
instance->SetVariable(UADefinedVariable::kKeyboardInsetRight,
kKeyboardInsetDefault);
instance->SetVariable(UADefinedVariable::kKeyboardInsetWidth,
kKeyboardInsetDefault);
instance->SetVariable(UADefinedVariable::kKeyboardInsetHeight,
kKeyboardInsetDefault);
}
}
} // namespace.
// This owns the static root instance.
class StyleEnvironmentVariables::RootOwner {
public:
StyleEnvironmentVariables& GetRoot() {
if (!instance_) {
instance_ = base::AdoptRef(new StyleEnvironmentVariables());
SetDefaultEnvironmentVariables(instance_.get());
}
return *instance_.get();
}
private:
scoped_refptr<StyleEnvironmentVariables> instance_;
};
// static
StyleEnvironmentVariables& StyleEnvironmentVariables::GetRootInstance() {
static auto* instance = new StyleEnvironmentVariables::RootOwner();
return instance->GetRoot();
}
// static
const AtomicString StyleEnvironmentVariables::GetVariableName(
UADefinedVariable variable) {
switch (variable) {
case UADefinedVariable::kSafeAreaInsetTop:
return "safe-area-inset-top";
case UADefinedVariable::kSafeAreaInsetLeft:
return "safe-area-inset-left";
case UADefinedVariable::kSafeAreaInsetBottom:
return "safe-area-inset-bottom";
case UADefinedVariable::kSafeAreaInsetRight:
return "safe-area-inset-right";
case UADefinedVariable::kKeyboardInsetTop:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-top";
case UADefinedVariable::kKeyboardInsetLeft:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-left";
case UADefinedVariable::kKeyboardInsetBottom:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-bottom";
case UADefinedVariable::kKeyboardInsetRight:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-right";
case UADefinedVariable::kKeyboardInsetWidth:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-width";
case UADefinedVariable::kKeyboardInsetHeight:
DCHECK(RuntimeEnabledFeatures::VirtualKeyboardEnabled());
return "keyboard-inset-height";
case UADefinedVariable::kFoldTop:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-top";
case UADefinedVariable::kFoldRight:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-right";
case UADefinedVariable::kFoldBottom:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-bottom";
case UADefinedVariable::kFoldLeft:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-left";
case UADefinedVariable::kFoldWidth:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-width";
case UADefinedVariable::kFoldHeight:
DCHECK(RuntimeEnabledFeatures::CSSFoldablesEnabled());
return "fold-height";
default:
break;
}
NOTREACHED();
}
// static
scoped_refptr<StyleEnvironmentVariables> StyleEnvironmentVariables::Create(
StyleEnvironmentVariables& parent) {
scoped_refptr<StyleEnvironmentVariables> obj =
base::AdoptRef(new StyleEnvironmentVariables());
// Add a reference to this instance from the parent.
obj->BindToParent(parent);
return obj;
}
StyleEnvironmentVariables::~StyleEnvironmentVariables() {
// Remove a reference to this instance from the parent.
if (parent_) {
auto it = parent_->children_.Find(this);
DCHECK(it != kNotFound);
parent_->children_.EraseAt(it);
}
}
void StyleEnvironmentVariables::SetVariable(
const AtomicString& name,
scoped_refptr<CSSVariableData> value) {
data_.Set(name, std::move(value));
InvalidateVariable(name);
}
void StyleEnvironmentVariables::SetVariable(const AtomicString& name,
const String& value) {
CSSTokenizer tokenizer(value);
Vector<CSSParserToken> tokens;
tokens.AppendVector(tokenizer.TokenizeToEOF());
Vector<String> backing_strings;
backing_strings.push_back(value);
SetVariable(
name,
CSSVariableData::CreateResolved(
std::move(tokens), std::move(backing_strings),
false /* is_animation_tainted */, false /* has_font_units */,
false /* has_root_font_units*/, g_null_atom, WTF::TextEncoding()));
}
void StyleEnvironmentVariables::SetVariable(const UADefinedVariable name,
const String& value) {
SetVariable(GetVariableName(name), value);
}
void StyleEnvironmentVariables::RemoveVariable(const AtomicString& name) {
data_.erase(name);
InvalidateVariable(name);
}
CSSVariableData* StyleEnvironmentVariables::ResolveVariable(
const AtomicString& name) {
auto result = data_.find(name);
if (result == data_.end() && parent_)
return parent_->ResolveVariable(name);
if (result == data_.end())
return nullptr;
return result->value.get();
}
void StyleEnvironmentVariables::DetachFromParent() {
DCHECK(parent_);
// Remove any reference the |parent| has to |this|.
auto it = parent_->children_.Find(this);
if (it != kNotFound)
parent_->children_.EraseAt(it);
parent_ = nullptr;
}
String StyleEnvironmentVariables::FormatPx(int value) {
return String::Format("%dpx", value);
}
void StyleEnvironmentVariables::ClearForTesting() {
data_.clear();
// If we are the root then we should re-apply the default variables.
if (!parent_)
SetDefaultEnvironmentVariables(this);
}
void StyleEnvironmentVariables::BindToParent(
StyleEnvironmentVariables& parent) {
DCHECK_EQ(nullptr, parent_);
parent_ = &parent;
parent.children_.push_back(this);
}
void StyleEnvironmentVariables::ParentInvalidatedVariable(
const AtomicString& name) {
// If we have not overridden the variable then we should invalidate it
// locally.
if (data_.find(name) == data_.end())
InvalidateVariable(name);
}
void StyleEnvironmentVariables::InvalidateVariable(const AtomicString& name) {
for (auto& it : children_)
it->ParentInvalidatedVariable(name);
}
} // namespace blink
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