qt: Implement Qt frontend to web browser

Using a custom reimplementation of QWebEngineView and an injector script.

src/yuzu/applets/web_browser.cpp

+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <mutex>
+
+#include <QKeyEvent>
+
+#include "core/hle/lock.h"
+#include "yuzu/applets/web_browser.h"
+#include "yuzu/main.h"
+
+constexpr char NX_SHIM_INJECT_SCRIPT[] = R"(
+    window.nx = {};
+    window.nx.playReport = {};
+    window.nx.playReport.setCounterSetIdentifier = function () {
+        console.log("nx.footer.setCounterSetIdentifier called - unimplemented");
+    };
+
+    window.nx.playReport.incrementCounter = function () {
+        console.log("nx.footer.incrementCounter called - unimplemented");
+    };
+
+    window.nx.footer = {};
+    window.nx.footer.unsetAssign = function () {
+        console.log("nx.footer.unsetAssign called - unimplemented");
+    };
+
+    var yuzu_key_callbacks = [];
+    window.nx.footer.setAssign = function(key, discard1, func, discard2) {
+        switch (key) {
+        case 'A':
+            yuzu_key_callbacks[0] = func;
+            break;
+        case 'B':
+            yuzu_key_callbacks[1] = func;
+            break;
+        case 'X':
+            yuzu_key_callbacks[2] = func;
+            break;
+        case 'Y':
+            yuzu_key_callbacks[3] = func;
+            break;
+        case 'L':
+            yuzu_key_callbacks[6] = func;
+            break;
+        case 'R':
+            yuzu_key_callbacks[7] = func;
+            break;
+        }
+    };
+
+    var applet_done = false;
+    window.nx.endApplet = function() {
+        applet_done = true;
+    };
+)";
+
+void NXInputWebEngineView::keyPressEvent(QKeyEvent* event) {
+    parent()->event(event);
+}
+
+void NXInputWebEngineView::keyReleaseEvent(QKeyEvent* event) {
+    parent()->event(event);
+}
+
+QString GetNXShimInjectionScript() {
+    return QString::fromStdString(NX_SHIM_INJECT_SCRIPT);
+}
+
+NXInputWebEngineView::NXInputWebEngineView(QWidget* parent) : QWebEngineView(parent) {}
+
+QtWebBrowser::QtWebBrowser(GMainWindow& main_window) {
+    connect(this, &QtWebBrowser::MainWindowOpenPage, &main_window, &GMainWindow::WebBrowserOpenPage,
+            Qt::QueuedConnection);
+    connect(&main_window, &GMainWindow::WebBrowserUnpackRomFS, this,
+            &QtWebBrowser::MainWindowUnpackRomFS, Qt::QueuedConnection);
+    connect(&main_window, &GMainWindow::WebBrowserFinishedBrowsing, this,
+            &QtWebBrowser::MainWindowFinishedBrowsing, Qt::QueuedConnection);
+}
+
+QtWebBrowser::~QtWebBrowser() = default;
+
+void QtWebBrowser::OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
+                            std::function<void()> finished_callback) const {
+    this->unpack_romfs_callback = unpack_romfs_callback;
+    this->finished_callback = finished_callback;
+
+    const auto index = url.find('?');
+    if (index == std::string::npos) {
+        emit MainWindowOpenPage(url, "");
+    } else {
+        const auto front = url.substr(0, index);
+        const auto back = url.substr(index);
+        emit MainWindowOpenPage(front, back);
+    }
+}
+
+void QtWebBrowser::MainWindowUnpackRomFS() {
+    // Acquire the HLE mutex
+    std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
+    unpack_romfs_callback();
+}
+
+void QtWebBrowser::MainWindowFinishedBrowsing() {
+    // Acquire the HLE mutex
+    std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
+    finished_callback();
+}

src/yuzu/applets/web_browser.h

+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <QObject>
+#include <QWebEngineView>
+#include "core/frontend/applets/web_browser.h"
+
+class GMainWindow;
+
+QString GetNXShimInjectionScript();
+
+class NXInputWebEngineView : public QWebEngineView {
+public:
+    NXInputWebEngineView(QWidget* parent = nullptr);
+
+protected:
+    void keyPressEvent(QKeyEvent* event) override;
+    void keyReleaseEvent(QKeyEvent* event) override;
+};
+
+class QtWebBrowser final : public QObject, public Core::Frontend::WebBrowserApplet {
+    Q_OBJECT
+
+public:
+    explicit QtWebBrowser(GMainWindow& main_window);
+    ~QtWebBrowser() override;
+
+    void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
+                  std::function<void()> finished_callback) const override;
+
+signals:
+    void MainWindowOpenPage(std::string_view filename, std::string_view additional_args) const;
+
+public slots:
+    void MainWindowUnpackRomFS();
+    void MainWindowFinishedBrowsing();
+
+private:
+    mutable std::function<void()> unpack_romfs_callback;
+    mutable std::function<void()> finished_callback;
+};