qt/applets: Provide Qt frontend implementation of software keyboard

Implements all of the features of the keyboard, including length, default text, character validation, and UTF-16 character support.

3 files changed, 171 insertions, 0 deletions

diff --git a/src/yuzu/CMakeLists.txt b/src/yuzu/CMakeLists.txt
index f9ca2948e..53c7f00d4 100644
--- a/src/yuzu/CMakeLists.txt
+++ b/src/yuzu/CMakeLists.txt
@@ -7,6 +7,8 @@ add_executable(yuzu
     Info.plist
     about_dialog.cpp
     about_dialog.h
+    applets/software_keyboard.cpp
+    applets/software_keyboard.h
     bootmanager.cpp
     bootmanager.h
     compatibility_list.cpp
diff --git a/src/yuzu/applets/software_keyboard.cpp b/src/yuzu/applets/software_keyboard.cpp
new file mode 100644
index 000000000..9e1c59626
--- /dev/null
+++ b/src/yuzu/applets/software_keyboard.cpp
@@ -0,0 +1,107 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <locale>
+#include <QDialogButtonBox>
+#include <QFont>
+#include <QLabel>
+#include <QLineEdit>
+#include <QVBoxLayout>
+#include "common/logging/backend.h"
+#include "yuzu/applets/software_keyboard.h"
+
+QtSoftwareKeyboardValidator::QtSoftwareKeyboardValidator(
+    Frontend::SoftwareKeyboardApplet::Parameters parameters)
+    : parameters(std::move(parameters)) {}
+
+QValidator::State QtSoftwareKeyboardValidator::validate(QString& input, int&) const {
+    if (input.size() > parameters.max_length)
+        return Invalid;
+    if (parameters.disable_space && input.contains(' '))
+        return Invalid;
+    if (parameters.disable_address && input.contains('@'))
+        return Invalid;
+    if (parameters.disable_percent && input.contains('%'))
+        return Invalid;
+    if (parameters.disable_slash && (input.contains('/') || input.contains('\\')))
+        return Invalid;
+    if (parameters.disable_number &&
+        std::any_of(input.begin(), input.end(), [](QChar c) { return c.isDigit(); }))
+        return Invalid;
+
+    if (parameters.disable_download_code &&
+        std::any_of(input.begin(), input.end(), [](QChar c) { return c == 'O' || c == 'I'; }))
+        return Invalid;
+
+    return Acceptable;
+}
+
+QtSoftwareKeyboardDialog::QtSoftwareKeyboardDialog(
+    QWidget* parent, Frontend::SoftwareKeyboardApplet::Parameters parameters_)
+    : QDialog(parent), parameters(std::move(parameters_)) {
+    layout = new QVBoxLayout;
+
+    header_label = new QLabel(QString::fromStdU16String(parameters.header_text));
+    header_label->setFont({header_label->font().family(), 12, QFont::Bold});
+    if (header_label->text().isEmpty())
+        header_label->setText(tr("Enter text:"));
+
+    sub_label = new QLabel(QString::fromStdU16String(parameters.sub_text));
+    sub_label->setFont({sub_label->font().family(), sub_label->font().pointSize(),
+                        sub_label->font().weight(), true});
+    sub_label->setHidden(parameters.sub_text.empty());
+
+    guide_label = new QLabel(QString::fromStdU16String(parameters.guide_text));
+    guide_label->setHidden(parameters.guide_text.empty());
+
+    line_edit = new QLineEdit;
+    line_edit->setValidator(new QtSoftwareKeyboardValidator(parameters));
+    line_edit->setMaxLength(static_cast<int>(parameters.max_length));
+    line_edit->setText(QString::fromStdU16String(parameters.initial_text));
+    line_edit->setCursorPosition(
+        parameters.cursor_at_beginning ? 0 : static_cast<int>(parameters.initial_text.size()));
+    line_edit->setEchoMode(parameters.password ? QLineEdit::Password : QLineEdit::Normal);
+
+    buttons = new QDialogButtonBox;
+    buttons->addButton(tr("Cancel"), QDialogButtonBox::RejectRole);
+    buttons->addButton(parameters.submit_text.empty()
+                           ? tr("OK")
+                           : QString::fromStdU16String(parameters.submit_text),
+                       QDialogButtonBox::AcceptRole);
+
+    connect(buttons, &QDialogButtonBox::accepted, this, &QtSoftwareKeyboardDialog::Submit);
+    connect(buttons, &QDialogButtonBox::rejected, this, &QtSoftwareKeyboardDialog::Reject);
+    layout->addWidget(header_label);
+    layout->addWidget(sub_label);
+    layout->addWidget(guide_label);
+    layout->addWidget(line_edit);
+    layout->addWidget(buttons);
+    setLayout(layout);
+    setWindowTitle("Software Keyboard");
+}
+
+void QtSoftwareKeyboardDialog::Submit() {
+    ok = true;
+    text = line_edit->text().toStdU16String();
+    accept();
+}
+
+void QtSoftwareKeyboardDialog::Reject() {
+    ok = false;
+    text = Common::UTF8ToUTF16("");
+    accept();
+}
+
+QtSoftwareKeyboard::QtSoftwareKeyboard(QWidget& parent) : parent(parent) {}
+
+bool QtSoftwareKeyboard::GetText(Parameters parameters, std::u16string& text) {
+    QtSoftwareKeyboardDialog dialog(&parent, parameters);
+    dialog.setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint |
+                          Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint);
+    dialog.setWindowModality(Qt::WindowModal);
+    dialog.exec();
+
+    text = dialog.text;
+    return dialog.ok;
+}
diff --git a/src/yuzu/applets/software_keyboard.h b/src/yuzu/applets/software_keyboard.h
new file mode 100644
index 000000000..2a18419db
--- /dev/null
+++ b/src/yuzu/applets/software_keyboard.h
@@ -0,0 +1,62 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+#include <QDialog>
+#include <QValidator>
+#include "common/assert.h"
+#include "core/frontend/applets/software_keyboard.h"
+
+class QDialogButtonBox;
+class QLabel;
+class QLineEdit;
+class QVBoxLayout;
+class QtSoftwareKeyboard;
+
+class QtSoftwareKeyboardValidator final : public QValidator {
+public:
+    explicit QtSoftwareKeyboardValidator(Frontend::SoftwareKeyboardApplet::Parameters parameters);
+    State validate(QString&, int&) const override;
+
+private:
+    Frontend::SoftwareKeyboardApplet::Parameters parameters;
+};
+
+class QtSoftwareKeyboardDialog final : public QDialog {
+    Q_OBJECT
+
+public:
+    QtSoftwareKeyboardDialog(QWidget* parent,
+                             Frontend::SoftwareKeyboardApplet::Parameters parameters);
+    void Submit();
+    void Reject();
+
+private:
+    bool ok = false;
+    std::u16string text;
+
+    QDialogButtonBox* buttons;
+    QLabel* header_label;
+    QLabel* sub_label;
+    QLabel* guide_label;
+    QLineEdit* line_edit;
+    QVBoxLayout* layout;
+
+    Frontend::SoftwareKeyboardApplet::Parameters parameters;
+
+    friend class QtSoftwareKeyboard;
+};
+
+class QtSoftwareKeyboard final : public QObject, public Frontend::SoftwareKeyboardApplet {
+public:
+    explicit QtSoftwareKeyboard(QWidget& parent);
+    bool GetText(Parameters parameters, std::u16string& text) override;
+
+    ~QtSoftwareKeyboard() {
+        UNREACHABLE();
+    }
+
+private:
+    QWidget& parent;
+};