Mouse Gestures for Internet Explorer

///////////////////////////////////////////////////////////////
//
// TrailManager.cpp
//
// Created: 27/06/2005
// Copyright (c) 2005 Ralph Hare (ralph.hare@ysgyfarnog.co.uk)
// All rights reserved.
//
// The code and information is provided "as-is" without
// warranty of any kind, either expressed or implied.
//
///////////////////////////////////////////////////////////////

#include "StdAfx.h"
#include "TrailManager.h"
#include "TrailWindow.h"
#include "OSUtils.h"

namespace
{
    LPCTSTR KEY_NAME = _T( "Software\\Drowse\\Mouse Gestures\\Trails" );
    LPCTSTR VALUE_IS_ENABLED = _T( "Is Enabled" );
    LPCTSTR VALUE_COLOUR = _T( "Colour" );
    LPCTSTR VALUE_TRANSPARENCY = _T( "Transparency" );
    LPCTSTR VALUE_WIDTH = _T( "Width" );
    LPCTSTR VALUE_CUSTOM_COLOUR = _T( "Custom Colour" );
    LPCTSTR VALUE_FADE_SPEED = _T( "Fade Speed" );

    class DummyTrail : public MouseTrail
    {
    public:
        DummyTrail() :
            MouseTrail()
        {
        }

    private:
        void Begin( HWND ) {}
        void Update( const Path & ) {}
        void End() {}
        void Show() {}
        void Hide() {}
    };
}

TrailManager::TrailManager() :
    m_regKey(),
    m_isDirty( true ),
    m_pTrail()
{
    m_regKey.Create( HKEY_CURRENT_USER, KEY_NAME );
}

TrailManager::~TrailManager()
{
}

TrailManager & TrailManager::GetInstance()
{
    static TrailManager theInstance;
    return theInstance;
}

bool TrailManager::GetIsEnabled() const
{
    DWORD   val = 1;
    m_regKey.QueryDWORDValue( VALUE_IS_ENABLED, val );
    return val != 0;
}

COLORREF TrailManager::GetColour() const
{
    DWORD   val = RGB( 0, 0x80, 0 );    // dark green
    m_regKey.QueryDWORDValue( VALUE_COLOUR, val );
    return val;
}

BYTE TrailManager::GetTransparency() const
{
    DWORD   val = 128;          // 50%
    m_regKey.QueryDWORDValue( VALUE_TRANSPARENCY, val );
    return static_cast< BYTE >( val );
}

long TrailManager::GetWidth() const
{
    DWORD   val = 10;
    m_regKey.QueryDWORDValue( VALUE_WIDTH, val );
    return static_cast< long >( val );
}

COLORREF TrailManager::GetCustomColour() const
{
    DWORD   val = 0;            // black
    m_regKey.QueryDWORDValue( VALUE_CUSTOM_COLOUR, val );
    return val;
}

int TrailManager::GetFadeSpeed() const
{
    DWORD   val = 255;          // fade disabled
    m_regKey.QueryDWORDValue( VALUE_FADE_SPEED, val );
    return val;
}

void TrailManager::SetIsEnabled( bool isEnabled )
{
    m_regKey.SetDWORDValue( VALUE_IS_ENABLED, isEnabled );
}

void TrailManager::SetColour( COLORREF clr )
{
    m_regKey.SetDWORDValue( VALUE_COLOUR, clr );
    m_isDirty = true;
}

void TrailManager::SetTransparency( BYTE transparency )
{
    m_regKey.SetDWORDValue( VALUE_TRANSPARENCY, transparency );
    m_isDirty = true;
}

void TrailManager::SetWidth( long width )
{
    m_regKey.SetDWORDValue( VALUE_WIDTH, static_cast< DWORD >( width ) );
    m_isDirty = true;
}

void TrailManager::SetCustomColour( COLORREF clr )
{
    m_regKey.SetDWORDValue( VALUE_CUSTOM_COLOUR, clr );
    m_isDirty = true;
}

void TrailManager::SetFadeSpeed( int fadeSpeed )
{
    m_regKey.SetDWORDValue( VALUE_FADE_SPEED, fadeSpeed );
    m_isDirty = true;
}

MouseTrail * TrailManager::GetTrail()
{
    if( ( OSUtils::IsNT4() == false ) && GetIsEnabled() )
    {
        static TrailWindow  trail( GetColour(), GetWidth(), GetTransparency(), GetFadeSpeed() );

        if( m_isDirty )
        {
            trail.UpdateSettings( GetColour(), GetWidth(), GetTransparency(), GetFadeSpeed() );
            m_isDirty = false;
        }

        return &trail;
    }

    static DummyTrail   dummyTrail;
    return &dummyTrail;
}