src/video/cocoa/SDL_cocoamouse.m
author Wim Looman <ghostunderscore@gmail.com>
Fri, 03 Feb 2012 23:53:51 +1300
changeset 6301 e8a69c5378e7
parent 6138 4c64952a58fb
child 6676 4ff261ffaa42
permissions -rwxr-xr-x
Change SDL_SetCursor to set the cursor back to the default cursor when the window is unfocused.

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  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 from any source distribution.
*/
#include "SDL_config.h"

#if SDL_VIDEO_DRIVER_COCOA

#include "SDL_events.h"
#include "SDL_cocoavideo.h"

#include "../../events/SDL_mouse_c.h"


static SDL_Cursor *
Cocoa_CreateDefaultCursor()
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSCursor *nscursor;
    SDL_Cursor *cursor = NULL;

    nscursor = [NSCursor arrowCursor];

    if (nscursor) {
        cursor = SDL_calloc(1, sizeof(*cursor));
        if (cursor) {
            cursor->driverdata = nscursor;
            [nscursor retain];
        }
    }

    [pool release];

    return cursor;
}

static SDL_Cursor *
Cocoa_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSImage *nsimage;
    NSCursor *nscursor = NULL;
    SDL_Cursor *cursor = NULL;

    nsimage = Cocoa_CreateImage(surface);
    if (nsimage) {
        nscursor = [[NSCursor alloc] initWithImage: nsimage hotSpot: NSMakePoint(hot_x, hot_y)];
    }

    if (nscursor) {
        cursor = SDL_calloc(1, sizeof(*cursor));
        if (cursor) {
            cursor->driverdata = nscursor;
        }
    }

    [pool release];

    return cursor;
}

static void
Cocoa_FreeCursor(SDL_Cursor * cursor)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSCursor *nscursor = (NSCursor *)cursor->driverdata;

    [nscursor release];
    SDL_free(cursor);

    [pool release];
}

static int
Cocoa_ShowCursor(SDL_Cursor * cursor)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    if (cursor) {
        NSCursor *nscursor = (NSCursor *)cursor->driverdata;

        [nscursor set];
        [NSCursor unhide];
    } else {
        [NSCursor hide];
    }

    [pool release];

    return 0;
}

static void
Cocoa_WarpMouse(SDL_Window * window, int x, int y)
{
    CGPoint point;

    point.x = (float)window->x + x;
    point.y = (float)window->y + y;
    CGWarpMouseCursorPosition(point);
}

static int
Cocoa_SetRelativeMouseMode(SDL_bool enabled)
{
    CGError result;

    if (enabled) {
        result = CGAssociateMouseAndMouseCursorPosition(NO);
    } else {
        result = CGAssociateMouseAndMouseCursorPosition(YES);
    }
    if (result != kCGErrorSuccess) {
        SDL_SetError("CGAssociateMouseAndMouseCursorPosition() failed");
        return -1;
    }
    return 0;
}

void
Cocoa_InitMouse(_THIS)
{
    SDL_Mouse *mouse = SDL_GetMouse();

    mouse->CreateCursor = Cocoa_CreateCursor;
    mouse->ShowCursor = Cocoa_ShowCursor;
    mouse->FreeCursor = Cocoa_FreeCursor;
    mouse->WarpMouse = Cocoa_WarpMouse;
    mouse->SetRelativeMouseMode = Cocoa_SetRelativeMouseMode;

    SDL_SetDefaultCursor(Cocoa_CreateDefaultCursor());
}

void
Cocoa_HandleMouseEvent(_THIS, NSEvent *event)
{
    SDL_Mouse *mouse = SDL_GetMouse();

    if (mouse->relative_mode &&
        ([event type] == NSMouseMoved ||
         [event type] == NSLeftMouseDragged ||
         [event type] == NSRightMouseDragged ||
         [event type] == NSOtherMouseDragged)) {
        float x = [event deltaX];
        float y = [event deltaY];
        SDL_SendMouseMotion(mouse->focus, 1, (int)x, (int)y);
    }
}

void
Cocoa_HandleMouseWheel(SDL_Window *window, NSEvent *event)
{
    float x = [event deltaX];
    float y = [event deltaY];

    if (x > 0) {
        x += 0.9f;
    } else if (x < 0) {
        x -= 0.9f;
    }
    if (y > 0) {
        y += 0.9f;
    } else if (y < 0) {
        y -= 0.9f;
    }
    SDL_SendMouseWheel(window, (int)x, (int)y);
}

void
Cocoa_QuitMouse(_THIS)
{
}

#endif /* SDL_VIDEO_DRIVER_COCOA */

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