src/events/SDL_mouse.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 30 Mar 2015 11:31:53 -0700
changeset 9448 3d3ed3a5ba8d
parent 9334 5eb5ab33286e
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fixed relative mouse motion moving farther and farther off screen.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* General mouse handling code for SDL */
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#include "SDL_assert.h"
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#include "SDL_hints.h"
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#include "SDL_timer.h"
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#include "SDL_events.h"
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#include "SDL_events_c.h"
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#include "default_cursor.h"
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#include "../video/SDL_sysvideo.h"
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/* #define DEBUG_MOUSE */
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/* The mouse state */
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static SDL_Mouse SDL_mouse;
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static Uint32 SDL_double_click_time = 500;
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static int SDL_double_click_radius = 1;
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static int
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SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relative, int x, int y);
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/* Public functions */
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int
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SDL_MouseInit(void)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    mouse->cursor_shown = SDL_TRUE;
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    return (0);
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}
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void
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SDL_SetDefaultCursor(SDL_Cursor * cursor)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    mouse->def_cursor = cursor;
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    if (!mouse->cur_cursor) {
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        SDL_SetCursor(cursor);
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    }
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}
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SDL_Mouse *
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SDL_GetMouse(void)
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{
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    return &SDL_mouse;
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}
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void
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SDL_SetDoubleClickTime(Uint32 interval)
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{
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    SDL_double_click_time = interval;
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}
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SDL_Window *
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SDL_GetMouseFocus(void)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    return mouse->focus;
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}
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void
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SDL_ResetMouse(void)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    Uint8 i;
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#ifdef DEBUG_MOUSE
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    printf("Resetting mouse\n");
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#endif
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    for (i = 1; i <= sizeof(mouse->buttonstate)*8; ++i) {
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        if (mouse->buttonstate & SDL_BUTTON(i)) {
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            SDL_SendMouseButton(mouse->focus, mouse->mouseID, SDL_RELEASED, i);
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        }
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    }
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    SDL_assert(mouse->buttonstate == 0);
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}
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void
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SDL_SetMouseFocus(SDL_Window * window)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    if (mouse->focus == window) {
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        return;
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    }
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    /* Actually, this ends up being a bad idea, because most operating
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       systems have an implicit grab when you press the mouse button down
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       so you can drag things out of the window and then get the mouse up
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       when it happens.  So, #if 0...
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    */
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#if 0
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    if (mouse->focus && !window) {
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        /* We won't get anymore mouse messages, so reset mouse state */
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        SDL_ResetMouse();
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    }
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#endif
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    /* See if the current window has lost focus */
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    if (mouse->focus) {
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        SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_LEAVE, 0, 0);
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    }
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    mouse->focus = window;
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    if (mouse->focus) {
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        SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
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    }
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    /* Update cursor visibility */
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    SDL_SetCursor(NULL);
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}
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/* Check to see if we need to synthesize focus events */
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static SDL_bool
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SDL_UpdateMouseFocus(SDL_Window * window, int x, int y, Uint32 buttonstate)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    SDL_bool inWindow = SDL_TRUE;
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    if (window && ((window->flags & SDL_WINDOW_MOUSE_CAPTURE) == 0)) {
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        int w, h;
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        SDL_GetWindowSize(window, &w, &h);
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        if (x < 0 || y < 0 || x >= w || y >= h) {
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            inWindow = SDL_FALSE;
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        }
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    }
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/* Linux doesn't give you mouse events outside your window unless you grab
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   the pointer.
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   Windows doesn't give you mouse events outside your window unless you call
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   SetCapture().
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   Both of these are slightly scary changes, so for now we'll punt and if the
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   mouse leaves the window you'll lose mouse focus and reset button state.
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*/
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#ifdef SUPPORT_DRAG_OUTSIDE_WINDOW
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    if (!inWindow && !buttonstate) {
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#else
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    if (!inWindow) {
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#endif
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        if (window == mouse->focus) {
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#ifdef DEBUG_MOUSE
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            printf("Mouse left window, synthesizing move & focus lost event\n");
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#endif
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            SDL_PrivateSendMouseMotion(window, mouse->mouseID, 0, x, y);
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            SDL_SetMouseFocus(NULL);
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        }
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        return SDL_FALSE;
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    }
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    if (window != mouse->focus) {
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#ifdef DEBUG_MOUSE
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         printf("Mouse entered window, synthesizing focus gain & move event\n");
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#endif
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         SDL_SetMouseFocus(window);
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         SDL_PrivateSendMouseMotion(window, mouse->mouseID, 0, x, y);
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    }
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    return SDL_TRUE;
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}
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int
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SDL_SendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relative, int x, int y)
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{
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    if (window && !relative) {
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        SDL_Mouse *mouse = SDL_GetMouse();
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        if (!SDL_UpdateMouseFocus(window, x, y, mouse->buttonstate)) {
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            return 0;
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        }
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    }
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    return SDL_PrivateSendMouseMotion(window, mouseID, relative, x, y);
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}
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static int
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SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relative, int x, int y)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    int posted;
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    int xrel;
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    int yrel;
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    if (mouse->relative_mode_warp) {
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        int center_x = 0, center_y = 0;
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        SDL_GetWindowSize(window, &center_x, &center_y);
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        center_x /= 2;
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        center_y /= 2;
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        if (x == center_x && y == center_y) {
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            mouse->last_x = center_x;
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            mouse->last_y = center_y;
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            return 0;
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        }
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        SDL_WarpMouseInWindow(window, center_x, center_y);
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    }
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    if (relative) {
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        xrel = x;
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        yrel = y;
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        x = (mouse->last_x + xrel);
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        y = (mouse->last_y + yrel);
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    } else {
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        xrel = x - mouse->last_x;
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        yrel = y - mouse->last_y;
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    }
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    /* Drop events that don't change state */
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    if (!xrel && !yrel) {
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#ifdef DEBUG_MOUSE
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        printf("Mouse event didn't change state - dropped!\n");
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#endif
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        return 0;
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    }
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    /* Update internal mouse coordinates */
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    if (!mouse->relative_mode) {
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        mouse->x = x;
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        mouse->y = y;
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    } else {
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        mouse->x += xrel;
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        mouse->y += yrel;
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    }
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    /* make sure that the pointers find themselves inside the windows,
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       unless we have the mouse captured. */
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    if (window && ((window->flags & SDL_WINDOW_MOUSE_CAPTURE) == 0)) {
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        int x_max = 0, y_max = 0;
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        // !!! FIXME: shouldn't this be (window) instead of (mouse->focus)?
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        SDL_GetWindowSize(mouse->focus, &x_max, &y_max);
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        --x_max;
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        --y_max;
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        if (mouse->x > x_max) {
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            mouse->x = x_max;
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        }
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        if (mouse->x < 0) {
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            mouse->x = 0;
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        }
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        if (mouse->y > y_max) {
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            mouse->y = y_max;
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        }
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        if (mouse->y < 0) {
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            mouse->y = 0;
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        }
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    }
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    mouse->xdelta += xrel;
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    mouse->ydelta += yrel;
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    /* Move the mouse cursor, if needed */
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    if (mouse->cursor_shown && !mouse->relative_mode &&
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        mouse->MoveCursor && mouse->cur_cursor) {
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        mouse->MoveCursor(mouse->cur_cursor);
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    }
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    /* Post the event, if desired */
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    posted = 0;
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    if (SDL_GetEventState(SDL_MOUSEMOTION) == SDL_ENABLE) {
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        SDL_Event event;
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        event.motion.type = SDL_MOUSEMOTION;
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        event.motion.windowID = mouse->focus ? mouse->focus->id : 0;
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        event.motion.which = mouseID;
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        event.motion.state = mouse->buttonstate;
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        event.motion.x = mouse->x;
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        event.motion.y = mouse->y;
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        event.motion.xrel = xrel;
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        event.motion.yrel = yrel;
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        posted = (SDL_PushEvent(&event) > 0);
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    }
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    if (relative) {
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        mouse->last_x = mouse->x;
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        mouse->last_y = mouse->y;
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    } else {
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        /* Use unclamped values if we're getting events outside the window */
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        mouse->last_x = x;
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        mouse->last_y = y;
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    }
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    return posted;
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}
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static SDL_MouseClickState *GetMouseClickState(SDL_Mouse *mouse, Uint8 button)
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{
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    if (button >= mouse->num_clickstates) {
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        int i, count = button + 1;
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        SDL_MouseClickState *clickstate = (SDL_MouseClickState *)SDL_realloc(mouse->clickstate, count * sizeof(*mouse->clickstate));
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        if (!clickstate) {
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            return NULL;
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        }
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        mouse->clickstate = clickstate;
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        for (i = mouse->num_clickstates; i < count; ++i) {
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            SDL_zero(mouse->clickstate[i]);
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        }
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        mouse->num_clickstates = count;
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    }
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    return &mouse->clickstate[button];
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}
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int
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SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button)
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{
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    SDL_Mouse *mouse = SDL_GetMouse();
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    int posted;
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    Uint32 type;
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    Uint32 buttonstate = mouse->buttonstate;
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    SDL_MouseClickState *clickstate = GetMouseClickState(mouse, button);
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    Uint8 click_count;
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    /* Figure out which event to perform */
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    switch (state) {
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    case SDL_PRESSED:
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        type = SDL_MOUSEBUTTONDOWN;
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        buttonstate |= SDL_BUTTON(button);
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        break;
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    case SDL_RELEASED:
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        type = SDL_MOUSEBUTTONUP;
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        buttonstate &= ~SDL_BUTTON(button);
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        break;
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    default:
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        /* Invalid state -- bail */
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        return 0;
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    }
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    /* We do this after calculating buttonstate so button presses gain focus */
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    if (window && state == SDL_PRESSED) {
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        SDL_UpdateMouseFocus(window, mouse->x, mouse->y, buttonstate);
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    }
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    if (buttonstate == mouse->buttonstate) {
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        /* Ignore this event, no state change */
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        return 0;
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    }
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    mouse->buttonstate = buttonstate;
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    if (clickstate) {
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        if (state == SDL_PRESSED) {
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            Uint32 now = SDL_GetTicks();
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            if (SDL_TICKS_PASSED(now, clickstate->last_timestamp + SDL_double_click_time) ||
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                SDL_abs(mouse->x - clickstate->last_x) > SDL_double_click_radius ||
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                SDL_abs(mouse->y - clickstate->last_y) > SDL_double_click_radius) {
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                clickstate->click_count = 0;
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            }
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            clickstate->last_timestamp = now;
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            clickstate->last_x = mouse->x;
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            clickstate->last_y = mouse->y;
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            if (clickstate->click_count < 255) {
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                ++clickstate->click_count;
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            }
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        }
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        click_count = clickstate->click_count;
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    } else {
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        click_count = 1;
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    }
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    /* Post the event, if desired */
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    posted = 0;
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   384
    if (SDL_GetEventState(type) == SDL_ENABLE) {
slouken@1895
   385
        SDL_Event event;
slouken@1895
   386
        event.type = type;
slouken@6950
   387
        event.button.windowID = mouse->focus ? mouse->focus->id : 0;
slouken@6950
   388
        event.button.which = mouseID;
slouken@1895
   389
        event.button.state = state;
slouken@1895
   390
        event.button.button = button;
slouken@8066
   391
        event.button.clicks = click_count;
slouken@1895
   392
        event.button.x = mouse->x;
slouken@1895
   393
        event.button.y = mouse->y;
slouken@1895
   394
        posted = (SDL_PushEvent(&event) > 0);
slouken@1895
   395
    }
slouken@6666
   396
slouken@6666
   397
    /* We do this after dispatching event so button releases can lose focus */
slouken@6666
   398
    if (window && state == SDL_RELEASED) {
slouken@6666
   399
        SDL_UpdateMouseFocus(window, mouse->x, mouse->y, buttonstate);
slouken@6666
   400
    }
slouken@6666
   401
slouken@1895
   402
    return posted;
slouken@1895
   403
}
slouken@1895
   404
slouken@1895
   405
int
urkle@9257
   406
SDL_SendMouseWheel(SDL_Window * window, SDL_MouseID mouseID, int x, int y, SDL_MouseWheelDirection direction)
slouken@1895
   407
{
slouken@5371
   408
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@1895
   409
    int posted;
slouken@1895
   410
slouken@4484
   411
    if (window) {
slouken@4484
   412
        SDL_SetMouseFocus(window);
slouken@4484
   413
    }
slouken@4484
   414
slouken@4465
   415
    if (!x && !y) {
slouken@1895
   416
        return 0;
slouken@1895
   417
    }
slouken@1895
   418
slouken@1895
   419
    /* Post the event, if desired */
slouken@1895
   420
    posted = 0;
slouken@4429
   421
    if (SDL_GetEventState(SDL_MOUSEWHEEL) == SDL_ENABLE) {
slouken@1895
   422
        SDL_Event event;
slouken@1895
   423
        event.type = SDL_MOUSEWHEEL;
slouken@4465
   424
        event.wheel.windowID = mouse->focus ? mouse->focus->id : 0;
slouken@6950
   425
        event.wheel.which = mouseID;
slouken@2152
   426
        event.wheel.x = x;
slouken@2152
   427
        event.wheel.y = y;
urkle@9257
   428
        event.wheel.direction = (Uint32)direction;
slouken@1895
   429
        posted = (SDL_PushEvent(&event) > 0);
slouken@1895
   430
    }
slouken@1895
   431
    return posted;
slouken@1895
   432
}
slouken@1895
   433
slouken@1895
   434
void
slouken@4465
   435
SDL_MouseQuit(void)
slouken@4465
   436
{
slouken@7493
   437
    SDL_Cursor *cursor, *next;
slouken@7493
   438
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@7493
   439
slouken@9161
   440
    if (mouse->CaptureMouse) {
slouken@9161
   441
        SDL_CaptureMouse(SDL_FALSE);
slouken@9161
   442
    }
slouken@8049
   443
    SDL_SetRelativeMouseMode(SDL_FALSE);
slouken@7493
   444
    SDL_ShowCursor(1);
slouken@7493
   445
slouken@7493
   446
    cursor = mouse->cursors;
slouken@7493
   447
    while (cursor) {
slouken@7493
   448
        next = cursor->next;
slouken@7493
   449
        SDL_FreeCursor(cursor);
slouken@7493
   450
        cursor = next;
slouken@7493
   451
    }
slouken@7493
   452
slouken@7493
   453
    if (mouse->def_cursor && mouse->FreeCursor) {
slouken@7493
   454
        mouse->FreeCursor(mouse->def_cursor);
slouken@7493
   455
    }
slouken@7493
   456
slouken@8066
   457
    if (mouse->clickstate) {
slouken@8066
   458
        SDL_free(mouse->clickstate);
slouken@8066
   459
    }
slouken@8066
   460
slouken@7493
   461
    SDL_zerop(mouse);
slouken@4465
   462
}
slouken@4465
   463
slouken@6673
   464
Uint32
slouken@4465
   465
SDL_GetMouseState(int *x, int *y)
slouken@4465
   466
{
slouken@5371
   467
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@4465
   468
slouken@4465
   469
    if (x) {
slouken@4465
   470
        *x = mouse->x;
slouken@4465
   471
    }
slouken@4465
   472
    if (y) {
slouken@4465
   473
        *y = mouse->y;
slouken@4465
   474
    }
slouken@4465
   475
    return mouse->buttonstate;
slouken@4465
   476
}
slouken@4465
   477
slouken@6673
   478
Uint32
slouken@4465
   479
SDL_GetRelativeMouseState(int *x, int *y)
slouken@4465
   480
{
slouken@5371
   481
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@4465
   482
slouken@4465
   483
    if (x) {
slouken@4465
   484
        *x = mouse->xdelta;
slouken@4465
   485
    }
slouken@4465
   486
    if (y) {
slouken@4465
   487
        *y = mouse->ydelta;
slouken@4465
   488
    }
slouken@4465
   489
    mouse->xdelta = 0;
slouken@4465
   490
    mouse->ydelta = 0;
slouken@4465
   491
    return mouse->buttonstate;
slouken@4465
   492
}
slouken@4465
   493
icculus@8945
   494
Uint32
icculus@8952
   495
SDL_GetGlobalMouseState(int *x, int *y)
icculus@8945
   496
{
icculus@8945
   497
    SDL_Mouse *mouse = SDL_GetMouse();
icculus@8945
   498
    int tmpx, tmpy;
icculus@8945
   499
icculus@8945
   500
    /* make sure these are never NULL for the backend implementations... */
icculus@8945
   501
    if (!x) {
icculus@8945
   502
        x = &tmpx;
icculus@8945
   503
    }
icculus@8945
   504
    if (!y) {
icculus@8945
   505
        y = &tmpy;
icculus@8945
   506
    }
icculus@8945
   507
icculus@8945
   508
    *x = *y = 0;
icculus@8945
   509
icculus@8952
   510
    if (!mouse->GetGlobalMouseState) {
icculus@8945
   511
        SDL_assert(0 && "This should really be implemented for every target.");
icculus@8945
   512
        return 0;
icculus@8945
   513
    }
icculus@8945
   514
icculus@8952
   515
    return mouse->GetGlobalMouseState(x, y);
icculus@8945
   516
}
icculus@8945
   517
slouken@4465
   518
void
slouken@3685
   519
SDL_WarpMouseInWindow(SDL_Window * window, int x, int y)
slouken@1895
   520
{
slouken@5371
   521
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@7191
   522
icculus@8953
   523
    if (window == NULL) {
slouken@7191
   524
        window = mouse->focus;
icculus@8944
   525
    }
slouken@7191
   526
icculus@8953
   527
    if (window == NULL) {
slouken@7191
   528
        return;
icculus@8944
   529
    }
slouken@1895
   530
slouken@1895
   531
    if (mouse->WarpMouse) {
slouken@5371
   532
        mouse->WarpMouse(window, x, y);
slouken@1895
   533
    } else {
slouken@6950
   534
        SDL_SendMouseMotion(window, mouse->mouseID, 0, x, y);
slouken@1895
   535
    }
slouken@1895
   536
}
slouken@1895
   537
slouken@8815
   538
void
slouken@8815
   539
SDL_WarpMouseGlobal(int x, int y)
slouken@8815
   540
{
slouken@8815
   541
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@8815
   542
slouken@8815
   543
    if (mouse->WarpMouseGlobal) {
slouken@8815
   544
        mouse->WarpMouseGlobal(x, y);
slouken@8815
   545
    }
slouken@8815
   546
}
slouken@8815
   547
slouken@8071
   548
static SDL_bool
slouken@8071
   549
ShouldUseRelativeModeWarp(SDL_Mouse *mouse)
slouken@8071
   550
{
slouken@8071
   551
    const char *hint;
slouken@8071
   552
slouken@8071
   553
    if (!mouse->SetRelativeMouseMode) {
slouken@8071
   554
        return SDL_TRUE;
slouken@8071
   555
    }
slouken@8071
   556
slouken@8071
   557
    hint = SDL_GetHint(SDL_HINT_MOUSE_RELATIVE_MODE_WARP);
slouken@8071
   558
    if (hint) {
slouken@8071
   559
        if (*hint == '0') {
slouken@8071
   560
            return SDL_FALSE;
slouken@8071
   561
        } else {
slouken@8071
   562
            return SDL_TRUE;
slouken@8071
   563
        }
slouken@8071
   564
    }
slouken@8071
   565
    return SDL_FALSE;
slouken@8071
   566
}
slouken@8071
   567
slouken@4465
   568
int
slouken@4465
   569
SDL_SetRelativeMouseMode(SDL_bool enabled)
slouken@4465
   570
{
slouken@5371
   571
    SDL_Mouse *mouse = SDL_GetMouse();
jorgen@7107
   572
    SDL_Window *focusWindow = SDL_GetKeyboardFocus();
slouken@4465
   573
slouken@5406
   574
    if (enabled == mouse->relative_mode) {
slouken@5406
   575
        return 0;
slouken@5406
   576
    }
slouken@5406
   577
jorgen@7107
   578
    if (enabled && focusWindow) {
jorgen@7107
   579
        /* Center it in the focused window to prevent clicks from going through
jorgen@7107
   580
         * to background windows.
jorgen@7107
   581
         */
jorgen@7107
   582
        SDL_SetMouseFocus(focusWindow);
jorgen@7107
   583
        SDL_WarpMouseInWindow(focusWindow, focusWindow->w/2, focusWindow->h/2);
jorgen@7107
   584
    }
jorgen@7107
   585
slouken@8071
   586
    /* Set the relative mode */
slouken@8071
   587
    if (!enabled && mouse->relative_mode_warp) {
slouken@8071
   588
        mouse->relative_mode_warp = SDL_FALSE;
slouken@8071
   589
    } else if (enabled && ShouldUseRelativeModeWarp(mouse)) {
slouken@8071
   590
        mouse->relative_mode_warp = SDL_TRUE;
slouken@8071
   591
    } else if (mouse->SetRelativeMouseMode(enabled) < 0) {
slouken@8269
   592
        if (enabled) {
philipp@8776
   593
            /* Fall back to warp mode if native relative mode failed */
slouken@8269
   594
            mouse->relative_mode_warp = SDL_TRUE;
slouken@8269
   595
        }
slouken@5406
   596
    }
slouken@4465
   597
    mouse->relative_mode = enabled;
slouken@4465
   598
slouken@8071
   599
    if (mouse->focus) {
slouken@8071
   600
        SDL_UpdateWindowGrab(mouse->focus);
slouken@8071
   601
slouken@8071
   602
        /* Put the cursor back to where the application expects it */
slouken@8071
   603
        if (!enabled) {
slouken@8071
   604
            SDL_WarpMouseInWindow(mouse->focus, mouse->x, mouse->y);
slouken@8071
   605
        }
slouken@4465
   606
    }
slouken@4465
   607
slouken@8071
   608
    /* Flush pending mouse motion - ideally we would pump events, but that's not always safe */
slouken@5406
   609
    SDL_FlushEvent(SDL_MOUSEMOTION);
slouken@5406
   610
slouken@4465
   611
    /* Update cursor visibility */
slouken@4465
   612
    SDL_SetCursor(NULL);
slouken@4465
   613
slouken@4465
   614
    return 0;
slouken@4465
   615
}
slouken@4465
   616
slouken@4465
   617
SDL_bool
slouken@4465
   618
SDL_GetRelativeMouseMode()
slouken@4465
   619
{
slouken@5371
   620
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@4465
   621
slouken@4465
   622
    return mouse->relative_mode;
slouken@4465
   623
}
slouken@4465
   624
icculus@8955
   625
int
icculus@8955
   626
SDL_CaptureMouse(SDL_bool enabled)
icculus@8955
   627
{
icculus@8955
   628
    SDL_Mouse *mouse = SDL_GetMouse();
icculus@8955
   629
    SDL_Window *focusWindow;
icculus@8955
   630
    SDL_bool isCaptured;
icculus@8955
   631
icculus@8955
   632
    if (!mouse->CaptureMouse) {
icculus@8955
   633
        return SDL_Unsupported();
icculus@8955
   634
    }
icculus@8955
   635
icculus@8955
   636
    focusWindow = SDL_GetKeyboardFocus();
icculus@8955
   637
icculus@8955
   638
    isCaptured = focusWindow && (focusWindow->flags & SDL_WINDOW_MOUSE_CAPTURE);
icculus@8955
   639
    if (isCaptured == enabled) {
icculus@8955
   640
        return 0;  /* already done! */
icculus@8955
   641
    }
icculus@8955
   642
icculus@8955
   643
    if (enabled) {
icculus@8955
   644
        if (!focusWindow) {
icculus@8955
   645
            return SDL_SetError("No window has focus");
icculus@8955
   646
        } else if (mouse->CaptureMouse(focusWindow) == -1) {
icculus@8955
   647
            return -1;  /* CaptureMouse() should call SetError */
icculus@8955
   648
        }
icculus@8955
   649
        focusWindow->flags |= SDL_WINDOW_MOUSE_CAPTURE;
icculus@8955
   650
    } else {
icculus@8955
   651
        if (mouse->CaptureMouse(NULL) == -1) {
icculus@8955
   652
            return -1;  /* CaptureMouse() should call SetError */
icculus@8955
   653
        }
icculus@8955
   654
        focusWindow->flags &= ~SDL_WINDOW_MOUSE_CAPTURE;
icculus@8955
   655
    }
icculus@8955
   656
icculus@8955
   657
    return 0;
icculus@8955
   658
}
icculus@8955
   659
slouken@1895
   660
SDL_Cursor *
slouken@1895
   661
SDL_CreateCursor(const Uint8 * data, const Uint8 * mask,
slouken@1895
   662
                 int w, int h, int hot_x, int hot_y)
slouken@1895
   663
{
slouken@1895
   664
    SDL_Surface *surface;
slouken@1895
   665
    SDL_Cursor *cursor;
slouken@1895
   666
    int x, y;
slouken@1895
   667
    Uint32 *pixel;
slouken@4465
   668
    Uint8 datab = 0, maskb = 0;
slouken@1895
   669
    const Uint32 black = 0xFF000000;
slouken@1895
   670
    const Uint32 white = 0xFFFFFFFF;
slouken@1895
   671
    const Uint32 transparent = 0x00000000;
slouken@1895
   672
slouken@1895
   673
    /* Make sure the width is a multiple of 8 */
slouken@1895
   674
    w = ((w + 7) & ~7);
slouken@1895
   675
slouken@1895
   676
    /* Create the surface from a bitmap */
slouken@5473
   677
    surface = SDL_CreateRGBSurface(0, w, h, 32,
slouken@5473
   678
                                   0x00FF0000,
slouken@5473
   679
                                   0x0000FF00,
slouken@5473
   680
                                   0x000000FF,
slouken@5473
   681
                                   0xFF000000);
slouken@1895
   682
    if (!surface) {
slouken@1895
   683
        return NULL;
slouken@1895
   684
    }
slouken@1895
   685
    for (y = 0; y < h; ++y) {
slouken@1895
   686
        pixel = (Uint32 *) ((Uint8 *) surface->pixels + y * surface->pitch);
slouken@1895
   687
        for (x = 0; x < w; ++x) {
slouken@1895
   688
            if ((x % 8) == 0) {
slouken@1895
   689
                datab = *data++;
slouken@1895
   690
                maskb = *mask++;
slouken@1895
   691
            }
slouken@1895
   692
            if (maskb & 0x80) {
slouken@1895
   693
                *pixel++ = (datab & 0x80) ? black : white;
slouken@1895
   694
            } else {
slouken@1895
   695
                *pixel++ = (datab & 0x80) ? black : transparent;
slouken@1895
   696
            }
slouken@1895
   697
            datab <<= 1;
slouken@1895
   698
            maskb <<= 1;
slouken@1895
   699
        }
slouken@1895
   700
    }
slouken@1895
   701
slouken@5473
   702
    cursor = SDL_CreateColorCursor(surface, hot_x, hot_y);
slouken@5473
   703
slouken@5473
   704
    SDL_FreeSurface(surface);
slouken@5473
   705
slouken@5473
   706
    return cursor;
slouken@5473
   707
}
slouken@5473
   708
slouken@5473
   709
SDL_Cursor *
slouken@5473
   710
SDL_CreateColorCursor(SDL_Surface *surface, int hot_x, int hot_y)
slouken@5473
   711
{
slouken@5473
   712
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@5473
   713
    SDL_Surface *temp = NULL;
slouken@5473
   714
    SDL_Cursor *cursor;
slouken@5473
   715
slouken@5473
   716
    if (!surface) {
slouken@5473
   717
        SDL_SetError("Passed NULL cursor surface");
slouken@5473
   718
        return NULL;
slouken@5473
   719
    }
slouken@5473
   720
slouken@5473
   721
    if (!mouse->CreateCursor) {
slouken@5473
   722
        SDL_SetError("Cursors are not currently supported");
slouken@5473
   723
        return NULL;
slouken@5473
   724
    }
slouken@5473
   725
slouken@5473
   726
    /* Sanity check the hot spot */
slouken@5473
   727
    if ((hot_x < 0) || (hot_y < 0) ||
slouken@5473
   728
        (hot_x >= surface->w) || (hot_y >= surface->h)) {
slouken@5473
   729
        SDL_SetError("Cursor hot spot doesn't lie within cursor");
slouken@5473
   730
        return NULL;
slouken@5473
   731
    }
slouken@5473
   732
slouken@5473
   733
    if (surface->format->format != SDL_PIXELFORMAT_ARGB8888) {
slouken@5473
   734
        temp = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ARGB8888, 0);
slouken@5473
   735
        if (!temp) {
slouken@5473
   736
            return NULL;
slouken@5473
   737
        }
slouken@5473
   738
        surface = temp;
slouken@5473
   739
    }
slouken@5473
   740
slouken@1895
   741
    cursor = mouse->CreateCursor(surface, hot_x, hot_y);
slouken@1895
   742
    if (cursor) {
slouken@1895
   743
        cursor->next = mouse->cursors;
slouken@1895
   744
        mouse->cursors = cursor;
slouken@1895
   745
    }
slouken@1895
   746
slouken@7720
   747
    SDL_FreeSurface(temp);
slouken@1895
   748
slouken@1895
   749
    return cursor;
slouken@1895
   750
}
slouken@1895
   751
mikesart@6675
   752
SDL_Cursor *
mikesart@6675
   753
SDL_CreateSystemCursor(SDL_SystemCursor id)
mikesart@6675
   754
{
mikesart@6675
   755
    SDL_Mouse *mouse = SDL_GetMouse();
mikesart@6675
   756
    SDL_Cursor *cursor;
mikesart@6675
   757
mikesart@6675
   758
    if (!mouse->CreateSystemCursor) {
mikesart@6675
   759
        SDL_SetError("CreateSystemCursor is not currently supported");
mikesart@6675
   760
        return NULL;
mikesart@6675
   761
    }
mikesart@6675
   762
slouken@7191
   763
    cursor = mouse->CreateSystemCursor(id);
mikesart@6675
   764
    if (cursor) {
mikesart@6675
   765
        cursor->next = mouse->cursors;
mikesart@6675
   766
        mouse->cursors = cursor;
mikesart@6675
   767
    }
mikesart@6675
   768
slouken@7191
   769
    return cursor;
mikesart@6675
   770
}
mikesart@6675
   771
slouken@1895
   772
/* SDL_SetCursor(NULL) can be used to force the cursor redraw,
slouken@1895
   773
   if this is desired for any reason.  This is used when setting
slouken@1895
   774
   the video mode and when the SDL window gains the mouse focus.
slouken@1895
   775
 */
slouken@1895
   776
void
slouken@1895
   777
SDL_SetCursor(SDL_Cursor * cursor)
slouken@1895
   778
{
slouken@5371
   779
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@1895
   780
slouken@1895
   781
    /* Set the new cursor */
slouken@1895
   782
    if (cursor) {
slouken@1895
   783
        /* Make sure the cursor is still valid for this mouse */
slouken@5405
   784
        if (cursor != mouse->def_cursor) {
slouken@5405
   785
            SDL_Cursor *found;
slouken@5405
   786
            for (found = mouse->cursors; found; found = found->next) {
slouken@5405
   787
                if (found == cursor) {
slouken@5405
   788
                    break;
slouken@5405
   789
                }
slouken@1895
   790
            }
slouken@5405
   791
            if (!found) {
slouken@5405
   792
                SDL_SetError("Cursor not associated with the current mouse");
slouken@5405
   793
                return;
slouken@5405
   794
            }
slouken@1895
   795
        }
slouken@1895
   796
        mouse->cur_cursor = cursor;
slouken@1895
   797
    } else {
ghostunderscore@6301
   798
        if (mouse->focus) {
ghostunderscore@6301
   799
            cursor = mouse->cur_cursor;
ghostunderscore@6301
   800
        } else {
ghostunderscore@6301
   801
            cursor = mouse->def_cursor;
ghostunderscore@6301
   802
        }
slouken@1895
   803
    }
slouken@1895
   804
slouken@1895
   805
    if (cursor && mouse->cursor_shown && !mouse->relative_mode) {
slouken@1895
   806
        if (mouse->ShowCursor) {
slouken@1895
   807
            mouse->ShowCursor(cursor);
slouken@1895
   808
        }
slouken@1895
   809
    } else {
slouken@1895
   810
        if (mouse->ShowCursor) {
slouken@1895
   811
            mouse->ShowCursor(NULL);
slouken@1895
   812
        }
slouken@1895
   813
    }
slouken@1895
   814
}
slouken@1895
   815
slouken@1895
   816
SDL_Cursor *
slouken@1895
   817
SDL_GetCursor(void)
slouken@1895
   818
{
slouken@5371
   819
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@1895
   820
slouken@1895
   821
    if (!mouse) {
slouken@1895
   822
        return NULL;
slouken@1895
   823
    }
slouken@1895
   824
    return mouse->cur_cursor;
slouken@1895
   825
}
slouken@1895
   826
jorgen@7104
   827
SDL_Cursor *
jorgen@7104
   828
SDL_GetDefaultCursor(void)
jorgen@7104
   829
{
jorgen@7104
   830
    SDL_Mouse *mouse = SDL_GetMouse();
jorgen@7104
   831
jorgen@7104
   832
    if (!mouse) {
jorgen@7104
   833
        return NULL;
jorgen@7104
   834
    }
jorgen@7104
   835
    return mouse->def_cursor;
jorgen@7104
   836
}
jorgen@7104
   837
slouken@1895
   838
void
slouken@1895
   839
SDL_FreeCursor(SDL_Cursor * cursor)
slouken@1895
   840
{
slouken@5371
   841
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@1895
   842
    SDL_Cursor *curr, *prev;
slouken@1895
   843
slouken@1895
   844
    if (!cursor) {
slouken@1895
   845
        return;
slouken@1895
   846
    }
slouken@1895
   847
slouken@1895
   848
    if (cursor == mouse->def_cursor) {
slouken@1895
   849
        return;
slouken@1895
   850
    }
slouken@1895
   851
    if (cursor == mouse->cur_cursor) {
slouken@1895
   852
        SDL_SetCursor(mouse->def_cursor);
slouken@1895
   853
    }
slouken@1895
   854
slouken@1895
   855
    for (prev = NULL, curr = mouse->cursors; curr;
slouken@1895
   856
         prev = curr, curr = curr->next) {
slouken@1895
   857
        if (curr == cursor) {
slouken@1895
   858
            if (prev) {
slouken@1895
   859
                prev->next = curr->next;
slouken@1895
   860
            } else {
slouken@1895
   861
                mouse->cursors = curr->next;
slouken@1895
   862
            }
slouken@1895
   863
slouken@1895
   864
            if (mouse->FreeCursor) {
slouken@1895
   865
                mouse->FreeCursor(curr);
slouken@1895
   866
            }
slouken@1895
   867
            return;
slouken@1895
   868
        }
slouken@1895
   869
    }
slouken@1895
   870
}
slouken@1895
   871
slouken@1895
   872
int
slouken@1895
   873
SDL_ShowCursor(int toggle)
slouken@1895
   874
{
slouken@5371
   875
    SDL_Mouse *mouse = SDL_GetMouse();
slouken@1895
   876
    SDL_bool shown;
slouken@1895
   877
slouken@1895
   878
    if (!mouse) {
slouken@1895
   879
        return 0;
slouken@1895
   880
    }
slouken@1895
   881
slouken@1895
   882
    shown = mouse->cursor_shown;
slouken@1895
   883
    if (toggle >= 0) {
slouken@1895
   884
        if (toggle) {
slouken@1895
   885
            mouse->cursor_shown = SDL_TRUE;
slouken@1895
   886
        } else {
slouken@1895
   887
            mouse->cursor_shown = SDL_FALSE;
slouken@1895
   888
        }
slouken@1895
   889
        if (mouse->cursor_shown != shown) {
slouken@1895
   890
            SDL_SetCursor(NULL);
slouken@1895
   891
        }
slouken@1895
   892
    }
slouken@1895
   893
    return shown;
slouken@1895
   894
}
slouken@1895
   895
jorgen@7097
   896
/* vi: set ts=4 sw=4 expandtab: */