source: code/branches/Tutorial_HS19/src/external/ois/linux/LinuxMouse.cpp

/*
The zlib/libpng License

Copyright (c) 2005-2007 Phillip Castaneda (pjcast -- www.wreckedgames.com)

This software is provided 'as-is', without any express or implied warranty. In no event will
the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial 
applications, and to alter it and redistribute it freely, subject to the following
restrictions:

    1. The origin of this software must not be misrepresented; you must not claim that 
                you wrote the original software. If you use this software in a product, 
                an acknowledgment in the product documentation would be appreciated but is 
                not required.

    2. Altered source versions must be plainly marked as such, and must not be 
                misrepresented as being the original software.

    3. This notice may not be removed or altered friosom any source distribution.
*/
#include "linux/LinuxMouse.h"
#include "linux/LinuxInputManager.h"
#include "OISException.h"
#include "OISEvents.h"

using namespace OIS;

//-------------------------------------------------------------------//
LinuxMouse::LinuxMouse(InputManager* creator, bool buffered, bool grab, bool hide)
        : Mouse(creator->inputSystemName(), buffered, 0, creator)
{
        display = 0;
        window = 0;
        cursor = 0;

        grabMouse = grab;
        hideMouse = hide;

        static_cast<LinuxInputManager*>(mCreator)->_setMouseUsed(true);
}

//-------------------------------------------------------------------//
void LinuxMouse::_initialize()
{
        //Clear old state
        mState.clear();
        mMoved  = false;
        mWarped = false;

        //6 is just some random value... hardly ever would anyone have a window smaller than 6
        oldXMouseX = oldXMouseY = 6;
        oldXMouseZ = 0;

        if( display ) XCloseDisplay(display);
        display = 0;
        window = static_cast<LinuxInputManager*>(mCreator)->_getWindow();

        //Create our local X mListener connection
        if( !(display = XOpenDisplay(0)) )
                OIS_EXCEPT(E_General, "LinuxMouse::_initialize >> Error opening X!");

        //Set it to recieve Mouse Input events
        if( XSelectInput(display, window, ButtonPressMask | ButtonReleaseMask | PointerMotionMask) == BadWindow )
                OIS_EXCEPT(E_General, "LinuxMouse::_initialize >> X error!");

        //Warp mouse inside window
        XWarpPointer(display,None,window,0,0,0,0, 6,6);

        //Create a blank cursor:
        Pixmap bm_no;
        XColor black, dummy;
        Colormap colormap;
        static char no_data[] = { 0,0,0,0,0,0,0,0 };

        colormap = DefaultColormap( display, DefaultScreen(display) );
        XAllocNamedColor( display, colormap, "black", &black, &dummy );
        bm_no = XCreateBitmapFromData( display, window, no_data, 8, 8 );
        cursor = XCreatePixmapCursor( display, bm_no, bm_no, &black, &black, 0, 0 );

        grab( grabMouse );
        hide( hideMouse );

        mouseFocusLost = false;
}

//-------------------------------------------------------------------//
LinuxMouse::~LinuxMouse()
{
        if( display )
        {
                grab(false);
                hide(false);
                XFreeCursor(display, cursor);
                XCloseDisplay(display);
        }

        static_cast<LinuxInputManager*>(mCreator)->_setMouseUsed(false);
}

//-------------------------------------------------------------------//
void LinuxMouse::setBuffered(bool buffered)
{
        mBuffered = buffered;
}

//-------------------------------------------------------------------//
void LinuxMouse::capture()
{
        //Clear out last frames values
        mState.X.rel = 0;
        mState.Y.rel = 0;
        mState.Z.rel = 0;

        _processXEvents();

        mWarped = false;

        if( mMoved == true )
        {
                if( mBuffered && mListener )
                        mListener->mouseMoved( MouseEvent( this, mState ) );

                mMoved = false;
        }

        //Check for losing/gaining mouse grab focus (alt-tab, etc)
        if( grabMouse )
        {
                if( static_cast<LinuxInputManager*>(mCreator)->_getGrabState() )
                {
                        if( mouseFocusLost )    //We just regained mouse grab focus
                        {
                                grab( true );
                                hide( hideMouse );
                                mouseFocusLost = false;
                        }
                }
                else
                {
                        if( mouseFocusLost == false )   //We just lost mouse grab focus
                        {
                                grab( false );
                                hide( false );
                                mouseFocusLost = true;
                        }
                }
        }
}

//-------------------------------------------------------------------//
void LinuxMouse::_processXEvents()
{
        //X11 Button Events: 1=left 2=middle 3=right; Our Bit Postion: 1=Left 2=Right 3=Middle
        char mask[4] = {0,1,4,2};
        XEvent event;

        //Poll x11 for events mouse events
        while( XPending(display) > 0 ) 
        {
                XNextEvent(display, &event);

                if( event.type == MotionNotify )
                {       //Mouse moved
                        //Ignore out of bounds mouse if we just warped
                        if( mWarped )
                        {
                                if(event.xmotion.x < 5 || event.xmotion.x > mState.width - 5 ||
                                   event.xmotion.y < 5 || event.xmotion.y > mState.height - 5)
                                        continue;
                        }

                        //Compute this frames Relative X & Y motion
                        int dx = event.xmotion.x - oldXMouseX;
                        int dy = event.xmotion.y - oldXMouseY;
                
                        //Store old values for next time to compute relative motion
                        oldXMouseX = event.xmotion.x;
                        oldXMouseY = event.xmotion.y;

                        mState.X.abs += dx;
                        mState.Y.abs += dy;
                        mState.X.rel += dx;
                        mState.Y.rel += dy;

                        //Check to see if we are grabbing the mouse to the window (requires clipping and warping)
                        if( grabMouse )
                        {
                                if( mState.X.abs < 0 )
                                        mState.X.abs = 0;
                                else if( mState.X.abs > mState.width )
                                        mState.X.abs = mState.width;

                                if( mState.Y.abs < 0 )
                                        mState.Y.abs = 0;
                                else if( mState.Y.abs > mState.height )
                                        mState.Y.abs = mState.height;

                                if( mouseFocusLost == false )
                                {
                                        //Keep mouse in window (fudge factor)
                                        if(event.xmotion.x < 5 || event.xmotion.x > mState.width - 5 ||
                                           event.xmotion.y < 5 || event.xmotion.y > mState.height - 5 )
                                        {
                                                oldXMouseX = mState.width >> 1;  //center x
                                                oldXMouseY = mState.height >> 1; //center y
                                                XWarpPointer(display, None, window, 0, 0, 0, 0, oldXMouseX, oldXMouseY);
                                                mWarped = true;
                                        }
                                }
                        }
                        mMoved = true;
                }
                else if( event.type == ButtonPress )
                {       //Button down
                        static_cast<LinuxInputManager*>(mCreator)->_setGrabState(true);

                        if( event.xbutton.button < 4 )
                        {
                                mState.buttons |= mask[event.xbutton.button];
                                if( mBuffered && mListener )
                                        if( mListener->mousePressed( MouseEvent( this, mState ),
                                                (MouseButtonID)(mask[event.xbutton.button] >> 1)) == false )
                                                return;
                        }
                }
                else if( event.type == ButtonRelease )
                {       //Button up
                        if( event.xbutton.button < 4 )
                        {
                                mState.buttons &= ~mask[event.xbutton.button];
                                if( mBuffered && mListener )
                                        if( mListener->mouseReleased( MouseEvent( this, mState ),
                                                (MouseButtonID)(mask[event.xbutton.button] >> 1)) == false )
                                                return;
                        }
                        //The Z axis gets pushed/released pair message (this is up)
                        else if( event.xbutton.button == 4 )
                        {
                                mState.Z.rel += 120;
                                mState.Z.abs += 120;
                                mMoved = true;
                        }
                        //The Z axis gets pushed/released pair message (this is down)
                        else if( event.xbutton.button == 5 )
                        {
                                mState.Z.rel -= 120;
                                mState.Z.abs -= 120;
                                mMoved = true;
                        }
                }
        }
}

//-------------------------------------------------------------------//
void LinuxMouse::grab(bool grab)
{
        if( grab )
                XGrabPointer(display, window, True, 0, GrabModeAsync, GrabModeAsync, window, None, CurrentTime);
        else
                XUngrabPointer(display, CurrentTime);
}

//-------------------------------------------------------------------//
void LinuxMouse::hide(bool hide)
{
        if( hide )
                XDefineCursor(display, window, cursor);
        else
                XUndefineCursor(display, window);
}