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diff --git a/include/SlidingStackWidget.h b/include/SlidingStackWidget.h
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+/*
+ * 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 SLIDINGSTACKWIDGET_H
+#define SLIDINGSTACKWIDGET_H
+
+#include <QDebug>
+#include <QEasingCurve>
+#include <QParallelAnimationGroup>
+#include <QPropertyAnimation>
+#include <QStackedWidget>
+#include <QWidget>
+
+/*
+ * SlidingStackWidget allows smooth side shifting of widgets,
+ * in addition to the hard switching from one to another offered
+ * by QStackedWidget.
+ */
+
+class SlidingStackWidget : public QStackedWidget
+{
+	Q_OBJECT
+
+public:
+	// Defines the animation direction.
+	enum AnimationDirection {
+		LEFT_TO_RIGHT,
+		RIGHT_TO_LEFT,
+		AUTOMATIC
+	};
+
+	SlidingStackWidget(QWidget *parent);
+	~SlidingStackWidget();
+
+public slots:
+	// Move to the next widget.
+	void slideInNext();
+
+	// Move to the previous widget.
+	void slideInPrevious();
+
+	// Move to a widget by index.
+	void slideInIndex(int index, enum AnimationDirection direction = AnimationDirection::AUTOMATIC);
+
+	int getWidgetIndex(QWidget *widget);
+signals:
+	// Internal signal to alert the engine for the animation's end.
+	void animationFinished();
+
+protected slots:
+	// Internal slot to handle the end of the animation.
+	void onAnimationFinished();
+
+protected:
+	// The method that does the main work for the widget transition.
+	void slideInWidget(QWidget *widget, enum AnimationDirection direction = AnimationDirection::AUTOMATIC);
+
+	// Indicates whether or not the animation is active.
+	bool active_;
+
+	// The widget currently displayed.
+	QWidget *window_;
+
+	// The speed of the animation in milliseconds.
+	int speed_;
+
+	// The animation type.
+	enum QEasingCurve::Type animation_type_;
+
+	// Current widget's index.
+	int now_;
+
+	// Reference point.
+	QPoint current_position_;
+
+	// Next widget's to show index.
+	int next_;
+};
+
+#endif  // SLIDINGSTACKWIDGET_H