qwt_picker_machine.cpp

/* -*- 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
 *****************************************************************************/

#include <qevent.h>
#include "qwt_event_pattern.h"
#include "qwt_picker_machine.h"

//! Constructor
QwtPickerMachine::QwtPickerMachine():
    d_state(0)
{
}

//! Destructor
QwtPickerMachine::~QwtPickerMachine()
{
}

//! Return the current state
int QwtPickerMachine::state() const
{
    return d_state;
}

//! Change the current state
void QwtPickerMachine::setState(int state)
{
    d_state = state;
}

//! Set the current state to 0.
void QwtPickerMachine::reset()
{
    setState(0);
}

//! Transition
QwtPickerMachine::CommandList QwtPickerClickPointMachine::transition(
    const QwtEventPattern &eventPattern, const QEvent *e)
{
    QwtPickerMachine::CommandList cmdList;

    switch(e->type()) {
    case QEvent::MouseButtonPress: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            cmdList += Begin;
            cmdList += Append;
            cmdList += End;
        }
        break;
    }
    case QEvent::KeyPress: {
        if ( eventPattern.keyMatch(
                    QwtEventPattern::KeySelect1, (const QKeyEvent *)e) ) {
            cmdList += Begin;
            cmdList += Append;
            cmdList += End;
        }
        break;
    }
    default:
        break;
    }

    return cmdList;
}

//! Transition
QwtPickerMachine::CommandList QwtPickerDragPointMachine::transition(
    const QwtEventPattern &eventPattern, const QEvent *e)
{
    QwtPickerMachine::CommandList cmdList;

    switch(e->type()) {
    case QEvent::MouseButtonPress: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                setState(1);
            }
        }
        break;
    }
    case QEvent::MouseMove:
    case QEvent::Wheel: {
        if ( state() != 0 )
            cmdList += Move;
        break;
    }
    case QEvent::MouseButtonRelease: {
        if ( state() != 0 ) {
            cmdList += End;
            setState(0);
        }
        break;
    }
    case QEvent::KeyPress: {
        if ( eventPattern.keyMatch(
                    QwtEventPattern::KeySelect1, (const QKeyEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                setState(1);
            } else {
                cmdList += End;
                setState(0);
            }
        }
        break;
    }
    default:
        break;
    }

    return cmdList;
}

//! Transition
QwtPickerMachine::CommandList QwtPickerClickRectMachine::transition(
    const QwtEventPattern &eventPattern, const QEvent *e)
{
    QwtPickerMachine::CommandList cmdList;

    switch(e->type()) {
    case QEvent::MouseButtonPress: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            switch(state()) {
            case 0: {
                cmdList += Begin;
                cmdList += Append;
                setState(1);
                break;
            }
            case 1: {
                // Uh, strange we missed the MouseButtonRelease
                break;
            }
            default: {
                cmdList += End;
                setState(0);
            }
            }
        }
    }
    case QEvent::MouseMove:
    case QEvent::Wheel: {
        if ( state() != 0 )
            cmdList += Move;
        break;
    }
    case QEvent::MouseButtonRelease: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            if ( state() == 1 ) {
                cmdList += Append;
                setState(2);
            }
        }
        break;
    }
    case QEvent::KeyPress: {
        if ( eventPattern.keyMatch(
                    QwtEventPattern::KeySelect1, (const QKeyEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                setState(1);
            } else {
                if ( state() == 1 ) {
                    cmdList += Append;
                    setState(2);
                } else if ( state() == 2 ) {
                    cmdList += End;
                    setState(0);
                }
            }
        }
        break;
    }
    default:
        break;
    }

    return cmdList;
}

//! Transition
QwtPickerMachine::CommandList QwtPickerDragRectMachine::transition(
    const QwtEventPattern &eventPattern, const QEvent *e)
{
    QwtPickerMachine::CommandList cmdList;

    switch(e->type()) {
    case QEvent::MouseButtonPress: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                cmdList += Append;
                setState(2);
            }
        }
        break;
    }
    case QEvent::MouseMove:
    case QEvent::Wheel: {
        if ( state() != 0 )
            cmdList += Move;
        break;
    }
    case QEvent::MouseButtonRelease: {
        if ( state() == 2 ) {
            cmdList += End;
            setState(0);
        }
        break;
    }
    case QEvent::KeyPress: {
        if ( eventPattern.keyMatch(
                    QwtEventPattern::KeySelect1, (const QKeyEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                cmdList += Append;
                setState(2);
            } else {
                cmdList += End;
                setState(0);
            }
        }
        break;
    }
    default:
        break;
    }

    return cmdList;
}

//! Transition
QwtPickerMachine::CommandList QwtPickerPolygonMachine::transition(
    const QwtEventPattern &eventPattern, const QEvent *e)
{
    QwtPickerMachine::CommandList cmdList;

    switch(e->type()) {
    case QEvent::MouseButtonPress: {
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect1, (const QMouseEvent *)e) ) {
            if (state() == 0) {
                cmdList += Begin;
                cmdList += Append;
                cmdList += Append;
                setState(1);
            } else {
                cmdList += End;
                setState(0);
            }
        }
        if ( eventPattern.mouseMatch(
                    QwtEventPattern::MouseSelect2, (const QMouseEvent *)e) ) {
            if (state() == 1)
                cmdList += Append;
        }
        break;
    }
    case QEvent::MouseMove:
    case QEvent::Wheel: {
        if ( state() != 0 )
            cmdList += Move;
        break;
    }
    case QEvent::KeyPress: {
        if ( eventPattern.keyMatch(
                    QwtEventPattern::KeySelect1, (const QKeyEvent *)e) ) {
            if ( state() == 0 ) {
                cmdList += Begin;
                cmdList += Append;
                cmdList += Append;
                setState(1);
            } else {
                cmdList += End;
                setState(0);
            }
        } else if ( eventPattern.keyMatch(
                        QwtEventPattern::KeySelect2, (const QKeyEvent *)e) ) {
            if ( state() == 1 )
                cmdList += Append;
        }
        break;
    }
    default:
        break;
    }

    return cmdList;
}