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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_PICKER_MACHINE
+#define QWT_PICKER_MACHINE 1
+
+#include "qwt_global.h"
+#include <qlist.h>
+
+class QEvent;
+class QwtEventPattern;
+
+/*!
+  \brief A state machine for QwtPicker selections
+
+  QwtPickerMachine accepts key and mouse events and translates them
+  into selection commands.
+
+  \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
+*/
+
+class QWT_EXPORT QwtPickerMachine
+{
+public:
+    /*!
+      Type of a selection.
+      \sa selectionType()
+    */
+    enum SelectionType
+    {
+        //! The state machine not usable for any type of selection.
+        NoSelection = -1,
+
+        //! The state machine is for selecting a single point.
+        PointSelection,
+
+        //! The state machine is for selecting a rectangle (2 points).
+        RectSelection,
+
+        //! The state machine is for selecting a polygon (many points).
+        PolygonSelection
+    };
+
+    //! Commands - the output of a state machine
+    enum Command
+    {
+        Begin,
+        Append,
+        Move,
+        Remove,
+        End
+    };
+
+    QwtPickerMachine( SelectionType );
+    virtual ~QwtPickerMachine();
+
+    //! Transition
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * ) = 0;
+    void reset();
+
+    int state() const;
+    void setState( int );
+
+    SelectionType selectionType() const;
+
+private:
+    const SelectionType d_selectionType;
+    int d_state;
+};
+
+/*!
+  \brief A state machine for indicating mouse movements
+
+  QwtPickerTrackerMachine supports displaying information
+  corresponding to mouse movements, but is not intended for
+  selecting anything. Begin/End are related to Enter/Leave events.
+*/
+class QWT_EXPORT QwtPickerTrackerMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerTrackerMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+/*!
+  \brief A state machine for point selections
+
+  Pressing QwtEventPattern::MouseSelect1 or
+  QwtEventPattern::KeySelect1 selects a point.
+
+  \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
+*/
+class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerClickPointMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+/*!
+  \brief A state machine for point selections
+
+  Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
+  starts the selection, releasing QwtEventPattern::MouseSelect1 or
+  a second press of QwtEventPattern::KeySelect1 terminates it.
+*/
+class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerDragPointMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+/*!
+  \brief A state machine for rectangle selections
+
+  Pressing QwtEventPattern::MouseSelect1 starts
+  the selection, releasing it selects the first point. Pressing it
+  again selects the second point and terminates the selection.
+  Pressing QwtEventPattern::KeySelect1 also starts the
+  selection, a second press selects the first point. A third one selects
+  the second point and terminates the selection.
+
+  \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
+*/
+
+class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerClickRectMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+/*!
+  \brief A state machine for rectangle selections
+
+  Pressing QwtEventPattern::MouseSelect1 selects
+  the first point, releasing it the second point.
+  Pressing QwtEventPattern::KeySelect1 also selects the
+  first point, a second press selects the second point and terminates
+  the selection.
+
+  \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
+*/
+
+class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerDragRectMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+/*!
+  \brief A state machine for polygon selections
+
+  Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
+  starts the selection and selects the first point, or appends a point.
+  Pressing QwtEventPattern::MouseSelect2 or QwtEventPattern::KeySelect2
+  appends the last point and terminates the selection.
+
+  \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
+*/
+
+class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
+{
+public:
+    QwtPickerPolygonMachine();
+
+    virtual QList<Command> transition(
+        const QwtEventPattern &, const QEvent * );
+};
+
+#endif