configure_system: Contrain profile usernames to 32 characters

Previously, we would let a user enter an unbounded name and then
silently truncate away characters that went over the 32-character limit.
This is kind of bad from the UX point of view, because we're essentially
not doing what the user intended in certain scenarios.

Instead, we clamp it to 32 characters and make that visually apparent in
the dialog box to provide a name for a user.

5 files changed, 113 insertions, 25 deletions

diff --git a/src/core/hle/service/acc/profile_manager.h b/src/core/hle/service/acc/profile_manager.h
index 1cd2e51b2..747c46c20 100644
--- a/src/core/hle/service/acc/profile_manager.h
+++ b/src/core/hle/service/acc/profile_manager.h
@@ -57,7 +57,8 @@ struct UUID {
 };
 static_assert(sizeof(UUID) == 16, "UUID is an invalid size!");
 
-using ProfileUsername = std::array<u8, 0x20>;
+constexpr std::size_t profile_username_size = 32;
+using ProfileUsername = std::array<u8, profile_username_size>;
 using ProfileData = std::array<u8, MAX_DATA>;
 using UserIDArray = std::array<UUID, MAX_USERS>;
 
diff --git a/src/yuzu/CMakeLists.txt b/src/yuzu/CMakeLists.txt
index 9379d9110..f9ca2948e 100644
--- a/src/yuzu/CMakeLists.txt
+++ b/src/yuzu/CMakeLists.txt
@@ -56,6 +56,8 @@ add_executable(yuzu
     main.h
     ui_settings.cpp
     ui_settings.h
+    util/limitable_input_dialog.cpp
+    util/limitable_input_dialog.h
     util/spinbox.cpp
     util/spinbox.h
     util/util.cpp
diff --git a/src/yuzu/configuration/configure_system.cpp b/src/yuzu/configuration/configure_system.cpp
index 4b34c1e28..a9dbcd71b 100644
--- a/src/yuzu/configuration/configure_system.cpp
+++ b/src/yuzu/configuration/configure_system.cpp
@@ -6,20 +6,20 @@
 #include <QFileDialog>
 #include <QGraphicsItem>
 #include <QGraphicsScene>
-#include <QInputDialog>
+#include <QHeaderView>
 #include <QMessageBox>
 #include <QStandardItemModel>
 #include <QTreeView>
 #include <QVBoxLayout>
-#include "common/common_paths.h"
-#include "common/logging/backend.h"
+#include "common/assert.h"
+#include "common/file_util.h"
 #include "common/string_util.h"
 #include "core/core.h"
 #include "core/hle/service/acc/profile_manager.h"
 #include "core/settings.h"
 #include "ui_configure_system.h"
 #include "yuzu/configuration/configure_system.h"
-#include "yuzu/main.h"
+#include "yuzu/util/limitable_input_dialog.h"
 
 namespace {
 constexpr std::array<int, 12> days_in_month = {{
@@ -83,6 +83,12 @@ QPixmap GetIcon(Service::Account::UUID uuid) {
 
     return icon.scaled(64, 64, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 }
+
+QString GetProfileUsernameFromUser(QWidget* parent, const QString& description_text) {
+    return LimitableInputDialog::GetText(parent, ConfigureSystem::tr("Enter Username"),
+                                         description_text, 1,
+                                         static_cast<int>(Service::Account::profile_username_size));
+}
 } // Anonymous namespace
 
 ConfigureSystem::ConfigureSystem(QWidget* parent)
@@ -244,15 +250,13 @@ void ConfigureSystem::SelectUser(const QModelIndex& index) {
 }
 
 void ConfigureSystem::AddUser() {
-    const auto uuid = Service::Account::UUID::Generate();
-
-    bool ok = false;
     const auto username =
-        QInputDialog::getText(this, tr("Enter Username"), tr("Enter a username for the new user:"),
-                              QLineEdit::Normal, QString(), &ok);
-    if (!ok)
+        GetProfileUsernameFromUser(this, tr("Enter a username for the new user:"));
+    if (username.isEmpty()) {
         return;
+    }
 
+    const auto uuid = Service::Account::UUID::Generate();
     profile_manager->CreateNewUser(uuid, username.toStdString());
 
     item_model->appendRow(new QStandardItem{GetIcon(uuid), FormatUserEntryText(username, uuid)});
@@ -267,23 +271,14 @@ void ConfigureSystem::RenameUser() {
     if (!profile_manager->GetProfileBase(*uuid, profile))
         return;
 
-    bool ok = false;
-    const auto old_username = GetAccountUsername(*profile_manager, *uuid);
-    const auto new_username =
-        QInputDialog::getText(this, tr("Enter Username"), tr("Enter a new username:"),
-                              QLineEdit::Normal, old_username, &ok);
-
-    if (!ok)
+    const auto new_username = GetProfileUsernameFromUser(this, tr("Enter a new username:"));
+    if (new_username.isEmpty()) {
         return;
+    }
 
-    std::fill(profile.username.begin(), profile.username.end(), '\0');
     const auto username_std = new_username.toStdString();
-    if (username_std.size() > profile.username.size()) {
-        std::copy_n(username_std.begin(), std::min(profile.username.size(), username_std.size()),
-                    profile.username.begin());
-    } else {
-        std::copy(username_std.begin(), username_std.end(), profile.username.begin());
-    }
+    std::fill(profile.username.begin(), profile.username.end(), '\0');
+    std::copy(username_std.begin(), username_std.end(), profile.username.begin());
 
     profile_manager->SetProfileBase(*uuid, profile);
 
diff --git a/src/yuzu/util/limitable_input_dialog.cpp b/src/yuzu/util/limitable_input_dialog.cpp
new file mode 100644
index 000000000..edd78e579
--- /dev/null
+++ b/src/yuzu/util/limitable_input_dialog.cpp
@@ -0,0 +1,59 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QLineEdit>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include "yuzu/util/limitable_input_dialog.h"
+
+LimitableInputDialog::LimitableInputDialog(QWidget* parent) : QDialog{parent} {
+    CreateUI();
+    ConnectEvents();
+}
+
+LimitableInputDialog::~LimitableInputDialog() = default;
+
+void LimitableInputDialog::CreateUI() {
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+
+    text_label = new QLabel(this);
+    text_entry = new QLineEdit(this);
+    buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
+
+    auto* const layout = new QVBoxLayout;
+    layout->addWidget(text_label);
+    layout->addWidget(text_entry);
+    layout->addWidget(buttons);
+
+    setLayout(layout);
+}
+
+void LimitableInputDialog::ConnectEvents() {
+    connect(buttons, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);
+}
+
+QString LimitableInputDialog::GetText(QWidget* parent, const QString& title, const QString& text,
+                                      int min_character_limit, int max_character_limit) {
+    Q_ASSERT(min_character_limit <= max_character_limit);
+
+    LimitableInputDialog dialog{parent};
+    dialog.setWindowTitle(title);
+    dialog.text_label->setText(text);
+    dialog.text_entry->setMaxLength(max_character_limit);
+
+    auto* const ok_button = dialog.buttons->button(QDialogButtonBox::Ok);
+    ok_button->setEnabled(false);
+    connect(dialog.text_entry, &QLineEdit::textEdited, [&](const QString& new_text) {
+        ok_button->setEnabled(new_text.length() >= min_character_limit);
+    });
+
+    if (dialog.exec() != QDialog::Accepted) {
+        return {};
+    }
+
+    return dialog.text_entry->text();
+}
diff --git a/src/yuzu/util/limitable_input_dialog.h b/src/yuzu/util/limitable_input_dialog.h
new file mode 100644
index 000000000..164ad7301
--- /dev/null
+++ b/src/yuzu/util/limitable_input_dialog.h
@@ -0,0 +1,31 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDialog>
+
+class QDialogButtonBox;
+class QLabel;
+class QLineEdit;
+
+/// A QDialog that functions similarly to QInputDialog, however, it allows
+/// restricting the minimum and total number of characters that can be entered.
+class LimitableInputDialog final : public QDialog {
+    Q_OBJECT
+public:
+    explicit LimitableInputDialog(QWidget* parent = nullptr);
+    ~LimitableInputDialog() override;
+
+    static QString GetText(QWidget* parent, const QString& title, const QString& text,
+                           int min_character_limit, int max_character_limit);
+
+private:
+    void CreateUI();
+    void ConnectEvents();
+
+    QLabel* text_label;
+    QLineEdit* text_entry;
+    QDialogButtonBox* buttons;
+};