mouse.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

    The Mezzanine Engine 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.

    The Mezzanine Engine 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 The Mezzanine Engine.  If not, see <http://www.gnu.org/licenses/>.
*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
/* We welcome the use of the Mezzanine engine to anyone, including companies who wish to
   Build professional software and charge for their product.

   However there are some practical restrictions, so if your project involves
   any of the following you should contact us and we will try to work something
   out:
    - DRM or Copy Protection of any kind(except Copyrights)
    - Software Patents You Do Not Wish to Freely License
    - Any Kind of Linking to Non-GPL licensed Works
    - Are Currently In Violation of Another Copyright Holder's GPL License
    - If You want to change our code and not add a few hundred MB of stuff to
        your distribution

   These and other limitations could cause serious legal problems if you ignore
   them, so it is best to simply contact us or the Free Software Foundation, if
   you have any questions.

   Joseph Toppi - toppij@gmail.com
   John Blackwood - makoenergy02@gmail.com
*/
#ifndef _inputmouse_cpp
#define _inputmouse_cpp

#include "Input/mouse.h"
#include "Graphics/viewport.h"
#include "Graphics/gamewindow.h"
#include "exception.h"

#include "timer.h"

#include <limits>

#include "SDL.h"
#include "../src/video/SDL_sysvideo.h"

namespace Mezzanine
{
    namespace Input
    {
        Mouse::Mouse() :
            CurrentViewport(NULL),
            HorizontalWheelState(Input::DIRECTIONALMOTION_UNCHANGED),
            VerticalWheelState(Input::DIRECTIONALMOTION_UNCHANGED)
        {
            this->Buttons.resize( (Input::MOUSEBUTTON_LAST - Input::MOUSEBUTTON_FIRST) + 1, Input::BUTTON_UP );

            this->MulticlickTimer = new Timer();
            this->MulticlickTimer->SetCurrentTimeInMilliseconds(500);
            this->MulticlickTimer->SetCountMode(Mezzanine::CM_CountDown);
        }

        Mouse::~Mouse()
        {
            delete MulticlickTimer;
        }

        void Mouse::UpdateImpl(const MetaCodeContainer& DeltaCodes, MetaCodeContainer& GeneratedCodes)
        {
            /// @todo Getting the mouse focus doesn't do what I originally thought it would.  When a mouse leaves a window, the focus isn't set to NULL
            /// as expected.  If you have only one window, then it just stays pointing to that window.  If you have two then it will stay on the first
            /// window until you mouse over the second, even if there is a space between the windows.  This should be updated somehow so that we can set
            /// "HoveredWindow" to NULL when none of our windows are being hovered.
            // First do some setup.  Get the window and save our position.
            SDL_Window* Focus = SDL_GetMouseFocus();
            Vector2 OldPosition = this->Position;
            // Update our states
            for( Whole X = 0 ; X < DeltaCodes.size() ; ++X )
            {
                const MetaCode& CurrCode = DeltaCodes[X];
                const Input::InputCode ICode = CurrCode.GetCode();
                if( ICode >= Input::MOUSEBUTTON_FIRST && ICode <= Input::MOUSEBUTTON_LAST ) {
                    // Mark the index for transition on the next update and then place it's state in the button vector
                    TransitioningIndexes.push_back( ICode - Input::MOUSEBUTTON_FIRST );
                    Buttons.at( ICode - Input::MOUSEBUTTON_FIRST ) = static_cast<Input::ButtonState>(CurrCode.GetMetaValue());
                    // Now do our checks for multi-click
                    if( this->IsMultiClickable(ICode) && Input::BUTTON_PRESSING == CurrCode.GetMetaValueAsButtonState() ) {
                        /// @todo This code isn't as graceful as I am sure it can be made.
                        // Update our multiclick timer
                        if( this->MulticlickTimer->IsStopped() ) {
                            this->MulticlickTimer->SetCurrentTimeInMilliseconds(500);
                            this->MulticlickCode.SetMetaValue(0);
                        }else{
                            this->MulticlickTimer->Reset(500 * 1000);
                        }

                        const Input::InputCode MCICode = this->ConvertToMultiClickCode(ICode);
                        if( this->MulticlickCode.GetCode() != MCICode ) {
                            this->MulticlickCode.SetMetaValue(1);
                            this->MulticlickCode.SetCode(MCICode);
                        }else{
                            Int32 ClickCount = this->MulticlickCode.GetMetaValue();
                            this->MulticlickCode.SetMetaValue( ++ClickCount );
                        }
                        this->MulticlickTimer->Start();
                    }
                }else if( Input::MOUSEWHEELVERTICAL == ICode ) {
                    this->VerticalWheelState = static_cast<Input::DirectionalMotionState>(CurrCode.GetMetaValue());
                }else if( Input::MOUSEWHEELHORIZONTAL == ICode ) {
                    this->HorizontalWheelState = static_cast<Input::DirectionalMotionState>(CurrCode.GetMetaValue());
                }
                // Only if we're on a window
                if( Focus ) {
                    if( Input::MOUSEABSOLUTEVERTICAL == ICode ) {
                        this->Position.Y = (Real)(CurrCode.GetMetaValue());
                    }else if( Input::MOUSEABSOLUTEHORIZONTAL == ICode ) {
                        this->Position.X = (Real)(CurrCode.GetMetaValue());
                    }/*else if( Input::MOUSEVERTICAL == ICode ) {
                        Delta.Y = (Real)(CurrCode.GetMetaValue());
                    }else if( Input::MOUSEHORIZONTAL == ICode ) {
                        Delta.X = (Real)(CurrCode.GetMetaValue());
                    }*/
                }
            }

            // Update our current window
            if( NULL != Focus ) {
                Graphics::GameWindow* Win = static_cast<Graphics::GameWindow*>(Focus->data->data);
                for( Graphics::GameWindow::ReverseViewportIterator ViewIt = Win->ReverseBeginViewport() ; ViewIt != Win->ReverseEndViewport() ; ++ViewIt )
                {
                    Graphics::Viewport* VP = (*ViewIt);
                    if( (this->Position.X >= (Real)(VP->GetActualLeft()) && this->Position.X <= (Real)(VP->GetActualLeft() + VP->GetActualWidth())) &&
                        (this->Position.Y >= (Real)(VP->GetActualTop()) && this->Position.Y <= (Real)(VP->GetActualTop() + VP->GetActualHeight()) ) )
                    {
                        this->CurrentViewport = VP;
                        break;
                    }
                }
            }else{
                this->CurrentViewport = NULL;
                this->Position.SetIdentity();
                this->Delta.SetIdentity();
            }
            this->Delta = this->Position - OldPosition;

            // Do our Multiclick check
            if( this->MulticlickCode.GetMetaValue() > 1 )
                GeneratedCodes.push_back(MulticlickCode);

            // Do our sequence updates
            this->Sequences.Update(DeltaCodes,GeneratedCodes);
        }

        void Mouse::VerifySequenceImpl(const MetaCodeContainer& Sequence) const
        {
            for( ConstMetaCodeIterator MCIt = Sequence.begin() ; MCIt != Sequence.end() ; ++MCIt )
            {
                if( !MCIt->IsMouseEvent() )
                    { MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Non-Mouse MetaCode detected when attempting to insert an Input Sequence into Mouse input device.") }
            }
        }

        void Mouse::AddPressedButtons(MetaCodeContainer& GeneratedCodes) const
        {
            for( UInt32 Index = 0 ; Index < this->Buttons.size() ; ++Index )
            {
                if( this->Buttons.at(Index) == Input::BUTTON_DOWN )
                    GeneratedCodes.push_back( MetaCode(Input::BUTTON_DOWN,static_cast<Input::InputCode>(Input::MOUSEBUTTON_FIRST + Index),GetDeviceIndex()) );
            }
        }

        Boole Mouse::IsMultiClickable(const Input::InputCode Code) const
        {
            return (Input::MOUSEBUTTON_1 <= Code && Input::MOUSEBUTTON_2 >= Code);
        }

        Input::InputCode Mouse::ConvertToMultiClickCode(const Input::InputCode Code) const
        {
            switch(Code)
            {
                case Input::MOUSEBUTTON_1: return Input::COMPOUNDINPUT_MOUSELEFTMULTICLICK;  break;
                case Input::MOUSEBUTTON_2: return Input::COMPOUNDINPUT_MOUSERIGHTMULTICLICK; break;
                default:
                {
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Attempting to convert unsupported mouse button code into a multiclick code.");
                }
            }
        }

        ///////////////////////////////////////////////////////////////////////////////
        // Query Methods

        Graphics::Viewport* Mouse::GetHoveredViewport() const
            { return this->CurrentViewport; }

        Graphics::GameWindow* Mouse::GetHoveredWindow() const
            { return ( this->CurrentViewport ? this->CurrentViewport->GetParentWindow() : NULL ); }

        const Vector2& Mouse::GetWindowPosition() const
            { return this->Position; }

        Real Mouse::GetWindowX() const
            { return this->Position.X; }

        Real Mouse::GetWindowY() const
            { return this->Position.Y; }

        Vector2 Mouse::GetViewportPosition() const
            { return ( this->CurrentViewport ? this->Position - Vector2( this->CurrentViewport->GetLeft(),this->CurrentViewport->GetTop() ) : Vector2(0,0) ); }

        Real Mouse::GetViewportX() const
            { return this->GetViewportPosition().X; }

        Real Mouse::GetViewportY() const
            { return this->GetViewportPosition().Y; }

        const Vector2& Mouse::GetMouseDelta() const
            { return this->Delta; }

        Real Mouse::GetDeltaX() const
            { return this->Delta.X; }

        Real Mouse::GetDeltaY() const
            { return this->Delta.Y; }

        UInt16 Mouse::GetDeviceIndex() const
            { return std::numeric_limits<UInt16>::max(); }

        const Input::ButtonState& Mouse::GetButtonState(const UInt16 Button) const
            { return this->Buttons.at( Button - 1 ); }

        const Input::ButtonState& Mouse::GetButtonState(const Input::InputCode& Button) const
            { return this->Buttons.at( Button - Input::MOUSEBUTTON_FIRST ); }

        const Input::DirectionalMotionState& Mouse::GetVerticalWheelState() const
            { return this->VerticalWheelState; }

        const Input::DirectionalMotionState& Mouse::GetHorizontalWheelState() const
            { return this->HorizontalWheelState; }

        ///////////////////////////////////////////////////////////////////////////////
        // Configuration Methods

        void Mouse::SetCursorVisibility(Boole Visible)
            { SDL_ShowCursor(Visible); }

        Boole Mouse::GetCursorVisibility()
            { return 0 != SDL_ShowCursor(-1); }

        Boole Mouse::SetRelativeMode(Boole Enable)
            { return 0 == SDL_SetRelativeMouseMode( (Enable?SDL_TRUE:SDL_FALSE) ); }

        Boole Mouse::GetRelativeMode()
            { return SDL_GetRelativeMouseMode(); }

        void Mouse::SetMouseCursor()
            { MEZZ_EXCEPTION(ExceptionBase::NOT_IMPLEMENTED_EXCEPTION,"Mouse cursor setting is currently not implemented."); } /// @todo Implement this.

        void Mouse::GetMouseCursor()
            { MEZZ_EXCEPTION(ExceptionBase::NOT_IMPLEMENTED_EXCEPTION,"Mouse cursor getting is currently not implemented."); } /// @todo Implement this.

        ///////////////////////////////////////////////////////////////////////////////
        // Utility Methods

        void Mouse::WarpCursorToPosition(Graphics::GameWindow* Win, const Vector2& Position)
            { if(Win) SDL_WarpMouseInWindow(Win->_GetSDLWindowPointer(),(int)Position.X,(int)Position.Y); }
    }//Input
}//Mezzanine

#endif