WebAssembly: Use the most recent settings access pattern

Includes delaying construction until its first actual use.

Change-Id: Ide0f7a12250c2597f45993d6ef0fb604c974a763
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/webassembly/webassemblyplugin.cpp

@@ -39,7 +39,6 @@ public:
     WebAssemblyQtVersionFactory qtVersionFactory;
     EmrunRunConfigurationFactory emrunRunConfigurationFactory;
     EmrunRunWorkerFactory emrunRunWorkerFactory;
-    WebAssemblySettings settings;
 };
 
 static WebAssemblyPluginPrivate *dd = nullptr;

src/plugins/webassembly/webassemblysettings.cpp

@@ -10,6 +10,7 @@
 #include "webassemblytr.h"
 
 #include <coreplugin/icore.h>
+#include <coreplugin/dialogs/ioptionspage.h>
 
 #include <utils/aspects.h>
 #include <utils/environment.h>
@@ -24,13 +25,11 @@
 
 using namespace Utils;
 
-namespace WebAssembly {
-namespace Internal {
+namespace WebAssembly::Internal {
 
-static WebAssemblySettings *theSettings = nullptr;
-
-WebAssemblySettings *WebAssemblySettings::instance()
+WebAssemblySettings &settings()
 {
+    static WebAssemblySettings theSettings;
     return theSettings;
 }
 
@@ -52,15 +51,9 @@ static QString environmentDisplay(const FilePath &sdkRoot)
 
 WebAssemblySettings::WebAssemblySettings()
 {
-    theSettings = this;
-
     setSettingsGroup("WebAssembly");
+    setAutoApply(false);
 
-    setId(Id(Constants::SETTINGS_ID));
-    setDisplayName(Tr::tr("WebAssembly"));
-    setCategory(ProjectExplorer::Constants::DEVICE_SETTINGS_CATEGORY);
-
-    registerAspect(&emSdk);
     emSdk.setSettingsKey("EmSdk");
     emSdk.setExpectedKind(Utils::PathChooser::ExistingDirectory);
     emSdk.setDefaultValue(FileUtils::homePath());
@@ -164,5 +157,20 @@ void WebAssemblySettings::updateStatus()
     m_qtVersionDisplay->setVisible(WebAssemblyQtVersion::isUnsupportedQtVersionInstalled());
 }
 
-} // Internal
-} // WebAssembly
+// WebAssemblySettingsPage
+
+class WebAssemblySettingsPage final : public Core::IOptionsPage
+{
+public:
+    WebAssemblySettingsPage()
+    {
+        setId(Id(Constants::SETTINGS_ID));
+        setDisplayName(Tr::tr("WebAssembly"));
+        setCategory(ProjectExplorer::Constants::DEVICE_SETTINGS_CATEGORY);
+        setSettingsProvider([] { return &settings(); });
+    }
+};
+
+const WebAssemblySettingsPage settingsPage;
+
+} // WebAssembly::Internal

src/plugins/webassembly/webassemblysettings.h

@@ -3,23 +3,22 @@
 
 #pragma once
 
-#include <coreplugin/dialogs/ioptionspage.h>
+#include <utils/aspects.h>
 
 QT_BEGIN_NAMESPACE
 class QTextBrowser;
 QT_END_NAMESPACE
 
-namespace WebAssembly {
-namespace Internal {
+namespace Utils { class InfoLabel; }
 
-class WebAssemblySettings final : public Core::PagedSettings
+namespace WebAssembly::Internal {
+
+class WebAssemblySettings final : public Utils::AspectContainer
 {
 public:
     WebAssemblySettings();
 
-    static WebAssemblySettings *instance();
-
-    Utils::FilePathAspect emSdk;
+    Utils::FilePathAspect emSdk{this};
 
 private:
     QWidget *m_emSdkEnvGroupBox = nullptr;
@@ -30,5 +29,6 @@ private:
     void updateStatus();
 };
 
-} // namespace Internal
-} // namespace WebAssmbly
+WebAssemblySettings &settings();
+
+} // WebAssmbly::Internal

src/plugins/webassembly/webassemblytoolchain.cpp

@@ -51,7 +51,7 @@ static void addRegisteredMinGWToEnvironment(Environment &env)
 
 void WebAssemblyToolChain::addToEnvironment(Environment &env) const
 {
-    const FilePath emSdk = WebAssemblySettings::instance()->emSdk();
+    const FilePath emSdk = settings().emSdk();
     WebAssemblyEmSdk::addToEnvironment(emSdk, env);
     if (env.osType() == OsTypeWindows)
         addRegisteredMinGWToEnvironment(env);
@@ -95,7 +95,7 @@ const QVersionNumber &WebAssemblyToolChain::minimumSupportedEmSdkVersion()
 
 static Toolchains doAutoDetect(const ToolchainDetector &detector)
 {
-    const FilePath sdk = WebAssemblySettings::instance()->emSdk();
+    const FilePath sdk = settings().emSdk();
     if (!WebAssemblyEmSdk::isValid(sdk))
         return {};