зеркало из https://github.com/mozilla/gecko-dev.git
328 строки
12 KiB
C++
328 строки
12 KiB
C++
/* -*- Mode: c++; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef PrefsHelper_h
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#define PrefsHelper_h
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#include "GeneratedJNINatives.h"
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#include "MainThreadUtils.h"
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#include "nsAppShell.h"
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#include "nsCOMPtr.h"
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#include "nsVariant.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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class PrefsHelper
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: public widget::PrefsHelper::Natives<PrefsHelper>
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, public UsesGeckoThreadProxy
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{
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PrefsHelper() = delete;
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static bool GetVariantPref(nsIObserverService* aObsServ,
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nsIWritableVariant* aVariant,
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jni::Object::Param aPrefHandler,
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const jni::String::LocalRef& aPrefName)
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{
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if (NS_FAILED(aObsServ->NotifyObservers(aVariant, "android-get-pref",
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aPrefName->ToString().get()))) {
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return false;
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}
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uint16_t varType = nsIDataType::VTYPE_EMPTY;
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if (NS_FAILED(aVariant->GetDataType(&varType))) {
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return false;
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}
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int32_t type = widget::PrefsHelper::PREF_INVALID;
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bool boolVal = false;
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int32_t intVal = 0;
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nsAutoString strVal;
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switch (varType) {
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case nsIDataType::VTYPE_BOOL:
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type = widget::PrefsHelper::PREF_BOOL;
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if (NS_FAILED(aVariant->GetAsBool(&boolVal))) {
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return false;
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}
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break;
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case nsIDataType::VTYPE_INT32:
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type = widget::PrefsHelper::PREF_INT;
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if (NS_FAILED(aVariant->GetAsInt32(&intVal))) {
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return false;
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}
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break;
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case nsIDataType::VTYPE_ASTRING:
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type = widget::PrefsHelper::PREF_STRING;
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if (NS_FAILED(aVariant->GetAsAString(strVal))) {
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return false;
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}
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break;
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default:
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return false;
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}
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const auto& jstrVal = type == widget::PrefsHelper::PREF_STRING ?
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jni::StringParam(strVal, aPrefName.Env()) :
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jni::StringParam(nullptr);
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if (aPrefHandler) {
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widget::PrefsHelper::CallPrefHandler(
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aPrefHandler, type, aPrefName, boolVal, intVal, jstrVal);
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} else {
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widget::PrefsHelper::OnPrefChange(
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aPrefName, type, boolVal, intVal, jstrVal);
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}
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return true;
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}
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static bool SetVariantPref(nsIObserverService* aObsServ,
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nsIWritableVariant* aVariant,
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jni::String::Param aPrefName,
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bool aFlush,
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int32_t aType,
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bool aBoolVal,
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int32_t aIntVal,
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jni::String::Param aStrVal)
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{
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nsresult rv = NS_ERROR_FAILURE;
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switch (aType) {
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case widget::PrefsHelper::PREF_BOOL:
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rv = aVariant->SetAsBool(aBoolVal);
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break;
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case widget::PrefsHelper::PREF_INT:
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rv = aVariant->SetAsInt32(aIntVal);
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break;
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case widget::PrefsHelper::PREF_STRING:
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rv = aVariant->SetAsAString(aStrVal->ToString());
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break;
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}
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if (NS_SUCCEEDED(rv)) {
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rv = aObsServ->NotifyObservers(aVariant, "android-set-pref",
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aPrefName->ToString().get());
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}
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uint16_t varType = nsIDataType::VTYPE_EMPTY;
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if (NS_SUCCEEDED(rv)) {
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rv = aVariant->GetDataType(&varType);
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}
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// We use set-to-empty to signal the pref was handled.
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const bool handled = varType == nsIDataType::VTYPE_EMPTY;
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if (NS_SUCCEEDED(rv) && handled && aFlush) {
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rv = Preferences::GetService()->SavePrefFile(nullptr);
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}
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if (NS_SUCCEEDED(rv)) {
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return handled;
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}
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NS_WARNING(nsPrintfCString("Failed to set pref %s",
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aPrefName->ToCString().get()).get());
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// Pretend we handled the pref.
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return true;
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}
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public:
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static void GetPrefs(const jni::Class::LocalRef& aCls,
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jni::ObjectArray::Param aPrefNames,
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jni::Object::Param aPrefHandler)
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{
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nsTArray<jni::Object::LocalRef> nameRefArray(aPrefNames->GetElements());
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nsCOMPtr<nsIObserverService> obsServ;
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nsCOMPtr<nsIWritableVariant> value;
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nsAdoptingString strVal;
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for (jni::Object::LocalRef& nameRef : nameRefArray) {
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jni::String::LocalRef nameStr(mozilla::Move(nameRef));
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const nsCString& name = nameStr->ToCString();
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int32_t type = widget::PrefsHelper::PREF_INVALID;
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bool boolVal = false;
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int32_t intVal = 0;
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switch (Preferences::GetType(name.get())) {
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case nsIPrefBranch::PREF_BOOL:
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type = widget::PrefsHelper::PREF_BOOL;
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boolVal = Preferences::GetBool(name.get());
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break;
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case nsIPrefBranch::PREF_INT:
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type = widget::PrefsHelper::PREF_INT;
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intVal = Preferences::GetInt(name.get());
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break;
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case nsIPrefBranch::PREF_STRING:
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type = widget::PrefsHelper::PREF_STRING;
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strVal = Preferences::GetLocalizedString(name.get());
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if (!strVal) {
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strVal = Preferences::GetString(name.get());
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}
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break;
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default:
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// Pref not found; try to find it.
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if (!obsServ) {
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obsServ = services::GetObserverService();
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if (!obsServ) {
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continue;
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}
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}
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if (value) {
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value->SetAsEmpty();
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} else {
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value = new nsVariant();
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}
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if (!GetVariantPref(obsServ, value,
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aPrefHandler, nameStr)) {
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NS_WARNING(nsPrintfCString("Failed to get pref %s",
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name.get()).get());
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}
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continue;
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}
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const auto& jstrVal = type == widget::PrefsHelper::PREF_STRING ?
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jni::StringParam(strVal, aCls.Env()) :
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jni::StringParam(nullptr);
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widget::PrefsHelper::CallPrefHandler(
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aPrefHandler, type, nameStr, boolVal, intVal, jstrVal);
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}
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widget::PrefsHelper::CallPrefHandler(
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aPrefHandler, widget::PrefsHelper::PREF_FINISH,
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nullptr, false, 0, nullptr);
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}
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static void SetPref(jni::String::Param aPrefName,
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bool aFlush,
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int32_t aType,
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bool aBoolVal,
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int32_t aIntVal,
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jni::String::Param aStrVal)
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{
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const nsCString& name = aPrefName->ToCString();
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if (Preferences::GetType(name.get()) == nsIPrefBranch::PREF_INVALID) {
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// No pref; try asking first.
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nsCOMPtr<nsIObserverService> obsServ =
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services::GetObserverService();
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nsCOMPtr<nsIWritableVariant> value = new nsVariant();
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if (obsServ && SetVariantPref(obsServ, value, aPrefName, aFlush,
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aType, aBoolVal, aIntVal, aStrVal)) {
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// The "pref" has changed; send a notification.
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GetVariantPref(obsServ, value, nullptr,
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jni::String::LocalRef(aPrefName));
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return;
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}
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}
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switch (aType) {
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case widget::PrefsHelper::PREF_BOOL:
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Preferences::SetBool(name.get(), aBoolVal);
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break;
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case widget::PrefsHelper::PREF_INT:
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Preferences::SetInt(name.get(), aIntVal);
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break;
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case widget::PrefsHelper::PREF_STRING:
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Preferences::SetString(name.get(), aStrVal->ToString());
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break;
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default:
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MOZ_ASSERT(false, "Invalid pref type");
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}
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if (aFlush) {
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Preferences::GetService()->SavePrefFile(nullptr);
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}
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}
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static void AddObserver(const jni::Class::LocalRef& aCls,
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jni::ObjectArray::Param aPrefNames,
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jni::Object::Param aPrefHandler,
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jni::ObjectArray::Param aPrefsToObserve)
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{
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// Call observer immediately with existing pref values.
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GetPrefs(aCls, aPrefNames, aPrefHandler);
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if (!aPrefsToObserve) {
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return;
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}
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nsTArray<jni::Object::LocalRef> nameRefArray(
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aPrefsToObserve->GetElements());
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nsAppShell* const appShell = nsAppShell::Get();
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MOZ_ASSERT(appShell);
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for (jni::Object::LocalRef& nameRef : nameRefArray) {
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jni::String::LocalRef nameStr(mozilla::Move(nameRef));
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MOZ_ALWAYS_SUCCEEDS(Preferences::AddStrongObserver(
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appShell, nameStr->ToCString().get()));
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}
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}
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static void RemoveObserver(const jni::Class::LocalRef& aCls,
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jni::ObjectArray::Param aPrefsToUnobserve)
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{
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nsTArray<jni::Object::LocalRef> nameRefArray(
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aPrefsToUnobserve->GetElements());
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nsAppShell* const appShell = nsAppShell::Get();
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MOZ_ASSERT(appShell);
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for (jni::Object::LocalRef& nameRef : nameRefArray) {
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jni::String::LocalRef nameStr(mozilla::Move(nameRef));
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MOZ_ALWAYS_SUCCEEDS(Preferences::RemoveObserver(
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appShell, nameStr->ToCString().get()));
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}
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}
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static void OnPrefChange(const char16_t* aData)
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{
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const nsCString& name = NS_LossyConvertUTF16toASCII(aData);
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int32_t type = -1;
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bool boolVal = false;
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int32_t intVal = false;
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nsAdoptingString strVal;
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switch (Preferences::GetType(name.get())) {
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case nsIPrefBranch::PREF_BOOL:
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type = widget::PrefsHelper::PREF_BOOL;
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boolVal = Preferences::GetBool(name.get());
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break;
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case nsIPrefBranch::PREF_INT:
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type = widget::PrefsHelper::PREF_INT;
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intVal = Preferences::GetInt(name.get());
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break;
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case nsIPrefBranch::PREF_STRING:
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type = widget::PrefsHelper::PREF_STRING;
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strVal = Preferences::GetLocalizedString(name.get());
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if (!strVal) {
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strVal = Preferences::GetString(name.get());
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}
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break;
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default:
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NS_WARNING(nsPrintfCString("Invalid pref %s",
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name.get()).get());
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return;
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}
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const auto& jstrVal = type == widget::PrefsHelper::PREF_STRING ?
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jni::StringParam(strVal) :
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jni::StringParam(nullptr);
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widget::PrefsHelper::OnPrefChange(name, type, boolVal, intVal, jstrVal);
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}
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};
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} // namespace
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#endif // PrefsHelper_h
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