Add settings panel for homeserver's domain

include/LoginPage.h

@@ -26,7 +26,9 @@
 
 #include "FlatButton.h"
 #include "InputValidator.h"
+#include "LoginSettings.h"
 #include "MatrixClient.h"
+#include "OverlayModal.h"
 #include "RaisedButton.h"
 #include "TextField.h"
 
@@ -53,10 +55,14 @@ private slots:
 	// Displays errors produced during the login.
 	void loginError(QString error_message);
 
+	// Manipulate settings modal.
+	void showSettingsModal();
+	void closeSettingsModal(const QString &server);
+
 private:
 	QVBoxLayout *top_layout_;
 
-	QHBoxLayout *back_layout_;
+	QHBoxLayout *top_bar_layout_;
 	QHBoxLayout *logo_layout_;
 	QHBoxLayout *button_layout_;
 
@@ -64,6 +70,7 @@ private:
 	QLabel *error_label_;
 
 	FlatButton *back_button_;
+	FlatButton *advanced_settings_button_;
 	RaisedButton *login_button_;
 
 	QWidget *form_widget_;
@@ -73,6 +80,10 @@ private:
 	TextField *matrixid_input_;
 	TextField *password_input_;
 
+	OverlayModal *settings_modal_;
+	LoginSettings *login_settings_;
+	QString custom_domain_;
+
 	InputValidator *matrix_id_validator_;
 
 	// Matrix client API provider.

include/LoginSettings.h

@@ -0,0 +1,40 @@
+/*
+ * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LOGIN_SETTINGS_H
+#define LOGIN_SETTINGS_H
+
+#include <QFrame>
+
+#include "FlatButton.h"
+#include "TextField.h"
+
+class LoginSettings : public QFrame
+{
+	Q_OBJECT
+public:
+	explicit LoginSettings(QWidget *parent = nullptr);
+
+signals:
+	void closing(const QString &server);
+
+private:
+	TextField *input_;
+	FlatButton *submit_button_;
+};
+
+#endif  // LOGIN_SETTINGS_H

include/ui/OverlayModal.h

@@ -50,6 +50,7 @@ private:
 inline void OverlayModal::setDuration(int duration)
 {
 	duration_ = duration;
+	animation_->setDuration(duration_);
 }
 
 inline void OverlayModal::setColor(QColor color)