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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
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