Ladybird: Move Qt-specific classes and functions to a Qt subdirectory

This will help a lot with developing chromes for different UI frameworks
where we can see which helper classes and processes are really using Qt
vs just using it to get at helper data.

As a bonus, remove Qt dependency from WebDriver.

Ladybird/Qt/LocationEdit.cpp

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "LocationEdit.h"
+#include "StringUtils.h"
+#include <AK/URL.h>
+#include <QCoreApplication>
+#include <QPalette>
+#include <QTextLayout>
+#include <QTimer>
+
+namespace Ladybird {
+
+LocationEdit::LocationEdit(QWidget* parent)
+    : QLineEdit(parent)
+{
+    setPlaceholderText("Enter web address");
+    connect(this, &QLineEdit::returnPressed, this, [&] {
+        clearFocus();
+    });
+
+    connect(this, &QLineEdit::textChanged, this, [&] {
+        highlight_location();
+    });
+}
+
+void LocationEdit::focusInEvent(QFocusEvent* event)
+{
+    QLineEdit::focusInEvent(event);
+    highlight_location();
+    QTimer::singleShot(0, this, &QLineEdit::selectAll);
+}
+
+void LocationEdit::focusOutEvent(QFocusEvent* event)
+{
+    QLineEdit::focusOutEvent(event);
+    highlight_location();
+}
+
+void LocationEdit::highlight_location()
+{
+    auto url = AK::URL::create_with_url_or_path(ak_deprecated_string_from_qstring(text()));
+
+    auto darkened_text_color = QPalette().color(QPalette::Text);
+    darkened_text_color.setAlpha(127);
+
+    QList<QInputMethodEvent::Attribute> attributes;
+    if (url.is_valid() && !hasFocus()) {
+        if (url.scheme() == "http" || url.scheme() == "https" || url.scheme() == "gemini") {
+            int host_start = (url.scheme().length() + 3) - cursorPosition();
+            auto host_length = url.serialized_host().release_value_but_fixme_should_propagate_errors().bytes().size();
+
+            // FIXME: Maybe add a generator to use https://publicsuffix.org/list/public_suffix_list.dat
+            //        for now just highlight the whole host
+
+            QTextCharFormat defaultFormat;
+            defaultFormat.setForeground(darkened_text_color);
+            attributes.append({
+                QInputMethodEvent::TextFormat,
+                -cursorPosition(),
+                static_cast<int>(text().length()),
+                defaultFormat,
+            });
+
+            QTextCharFormat hostFormat;
+            hostFormat.setForeground(QPalette().color(QPalette::Text));
+            attributes.append({
+                QInputMethodEvent::TextFormat,
+                host_start,
+                static_cast<int>(host_length),
+                hostFormat,
+            });
+        } else if (url.scheme() == "file") {
+            QTextCharFormat schemeFormat;
+            schemeFormat.setForeground(darkened_text_color);
+            attributes.append({
+                QInputMethodEvent::TextFormat,
+                -cursorPosition(),
+                static_cast<int>(url.scheme().length() + 3),
+                schemeFormat,
+            });
+        }
+    }
+
+    QInputMethodEvent event(QString(), attributes);
+    QCoreApplication::sendEvent(this, &event);
+}
+
+}