| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2020 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_internal.h" |
| |
| /* General touch handling code for SDL */ |
| |
| #include "SDL_assert.h" |
| #include "SDL_events.h" |
| #include "SDL_events_c.h" |
| #include "../video/SDL_sysvideo.h" |
| |
| |
| static int SDL_num_touch = 0; |
| static SDL_Touch **SDL_touchDevices = NULL; |
| |
| /* for mapping touch events to mice */ |
| |
| #define SYNTHESIZE_TOUCH_TO_MOUSE 1 |
| |
| #if SYNTHESIZE_TOUCH_TO_MOUSE |
| static SDL_bool finger_touching = SDL_FALSE; |
| static SDL_FingerID track_fingerid; |
| static SDL_TouchID track_touchid; |
| #endif |
| |
| /* Public functions */ |
| int |
| SDL_TouchInit(void) |
| { |
| return (0); |
| } |
| |
| int |
| SDL_GetNumTouchDevices(void) |
| { |
| return SDL_num_touch; |
| } |
| |
| SDL_TouchID |
| SDL_GetTouchDevice(int index) |
| { |
| if (index < 0 || index >= SDL_num_touch) { |
| SDL_SetError("Unknown touch device index %d", index); |
| return 0; |
| } |
| return SDL_touchDevices[index]->id; |
| } |
| |
| static int |
| SDL_GetTouchIndex(SDL_TouchID id) |
| { |
| int index; |
| SDL_Touch *touch; |
| |
| for (index = 0; index < SDL_num_touch; ++index) { |
| touch = SDL_touchDevices[index]; |
| if (touch->id == id) { |
| return index; |
| } |
| } |
| return -1; |
| } |
| |
| SDL_Touch * |
| SDL_GetTouch(SDL_TouchID id) |
| { |
| int index = SDL_GetTouchIndex(id); |
| if (index < 0 || index >= SDL_num_touch) { |
| if (SDL_GetVideoDevice()->ResetTouch != NULL) { |
| SDL_SetError("Unknown touch id %d, resetting", (int) id); |
| (SDL_GetVideoDevice()->ResetTouch)(SDL_GetVideoDevice()); |
| } else { |
| SDL_SetError("Unknown touch device id %d, cannot reset", (int) id); |
| } |
| return NULL; |
| } |
| return SDL_touchDevices[index]; |
| } |
| |
| SDL_TouchDeviceType |
| SDL_GetTouchDeviceType(SDL_TouchID id) |
| { |
| SDL_Touch *touch = SDL_GetTouch(id); |
| if (touch) { |
| return touch->type; |
| } |
| return SDL_TOUCH_DEVICE_INVALID; |
| } |
| |
| static int |
| SDL_GetFingerIndex(const SDL_Touch * touch, SDL_FingerID fingerid) |
| { |
| int index; |
| for (index = 0; index < touch->num_fingers; ++index) { |
| if (touch->fingers[index]->id == fingerid) { |
| return index; |
| } |
| } |
| return -1; |
| } |
| |
| static SDL_Finger * |
| SDL_GetFinger(const SDL_Touch * touch, SDL_FingerID id) |
| { |
| int index = SDL_GetFingerIndex(touch, id); |
| if (index < 0 || index >= touch->num_fingers) { |
| return NULL; |
| } |
| return touch->fingers[index]; |
| } |
| |
| int |
| SDL_GetNumTouchFingers(SDL_TouchID touchID) |
| { |
| SDL_Touch *touch = SDL_GetTouch(touchID); |
| if (touch) { |
| return touch->num_fingers; |
| } |
| return 0; |
| } |
| |
| SDL_Finger * |
| SDL_GetTouchFinger(SDL_TouchID touchID, int index) |
| { |
| SDL_Touch *touch = SDL_GetTouch(touchID); |
| if (!touch) { |
| return NULL; |
| } |
| if (index < 0 || index >= touch->num_fingers) { |
| SDL_SetError("Unknown touch finger"); |
| return NULL; |
| } |
| return touch->fingers[index]; |
| } |
| |
| int |
| SDL_AddTouch(SDL_TouchID touchID, SDL_TouchDeviceType type, const char *name) |
| { |
| SDL_Touch **touchDevices; |
| int index; |
| |
| index = SDL_GetTouchIndex(touchID); |
| if (index >= 0) { |
| return index; |
| } |
| |
| /* Add the touch to the list of touch */ |
| touchDevices = (SDL_Touch **) SDL_realloc(SDL_touchDevices, |
| (SDL_num_touch + 1) * sizeof(*touchDevices)); |
| if (!touchDevices) { |
| return SDL_OutOfMemory(); |
| } |
| |
| SDL_touchDevices = touchDevices; |
| index = SDL_num_touch; |
| |
| SDL_touchDevices[index] = (SDL_Touch *) SDL_malloc(sizeof(*SDL_touchDevices[index])); |
| if (!SDL_touchDevices[index]) { |
| return SDL_OutOfMemory(); |
| } |
| |
| /* Added touch to list */ |
| ++SDL_num_touch; |
| |
| /* we're setting the touch properties */ |
| SDL_touchDevices[index]->id = touchID; |
| SDL_touchDevices[index]->type = type; |
| SDL_touchDevices[index]->num_fingers = 0; |
| SDL_touchDevices[index]->max_fingers = 0; |
| SDL_touchDevices[index]->fingers = NULL; |
| |
| /* Record this touch device for gestures */ |
| /* We could do this on the fly in the gesture code if we wanted */ |
| SDL_GestureAddTouch(touchID); |
| |
| return index; |
| } |
| |
| static int |
| SDL_AddFinger(SDL_Touch *touch, SDL_FingerID fingerid, float x, float y, float pressure) |
| { |
| SDL_Finger *finger; |
| |
| if (touch->num_fingers == touch->max_fingers) { |
| SDL_Finger **new_fingers; |
| new_fingers = (SDL_Finger **)SDL_realloc(touch->fingers, (touch->max_fingers+1)*sizeof(*touch->fingers)); |
| if (!new_fingers) { |
| return SDL_OutOfMemory(); |
| } |
| touch->fingers = new_fingers; |
| touch->fingers[touch->max_fingers] = (SDL_Finger *)SDL_malloc(sizeof(*finger)); |
| if (!touch->fingers[touch->max_fingers]) { |
| return SDL_OutOfMemory(); |
| } |
| touch->max_fingers++; |
| } |
| |
| finger = touch->fingers[touch->num_fingers++]; |
| finger->id = fingerid; |
| finger->x = x; |
| finger->y = y; |
| finger->pressure = pressure; |
| return 0; |
| } |
| |
| static int |
| SDL_DelFinger(SDL_Touch* touch, SDL_FingerID fingerid) |
| { |
| SDL_Finger *temp; |
| |
| int index = SDL_GetFingerIndex(touch, fingerid); |
| if (index < 0) { |
| return -1; |
| } |
| |
| touch->num_fingers--; |
| temp = touch->fingers[index]; |
| touch->fingers[index] = touch->fingers[touch->num_fingers]; |
| touch->fingers[touch->num_fingers] = temp; |
| return 0; |
| } |
| |
| int |
| SDL_SendTouch(SDL_TouchID id, SDL_FingerID fingerid, SDL_Window * window, |
| SDL_bool down, float x, float y, float pressure) |
| { |
| int posted; |
| SDL_Finger *finger; |
| SDL_Mouse *mouse; |
| |
| SDL_Touch* touch = SDL_GetTouch(id); |
| if (!touch) { |
| return -1; |
| } |
| |
| mouse = SDL_GetMouse(); |
| |
| #if SYNTHESIZE_TOUCH_TO_MOUSE |
| /* SDL_HINT_TOUCH_MOUSE_EVENTS: controlling whether touch events should generate synthetic mouse events */ |
| { |
| if (mouse->touch_mouse_events) { |
| /* FIXME: maybe we should only restrict to a few SDL_TouchDeviceType */ |
| if (id != SDL_MOUSE_TOUCHID) { |
| if (window) { |
| if (down) { |
| if (finger_touching == SDL_FALSE) { |
| int pos_x = (int)(x * (float)window->w); |
| int pos_y = (int)(y * (float)window->h); |
| if (pos_x < 0) pos_x = 0; |
| if (pos_x > window->w - 1) pos_x = window->w - 1; |
| if (pos_y < 0) pos_y = 0; |
| if (pos_y > window->h - 1) pos_y = window->h - 1; |
| SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y); |
| SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT); |
| } |
| } else { |
| if (finger_touching == SDL_TRUE && track_touchid == id && track_fingerid == fingerid) { |
| SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT); |
| } |
| } |
| } |
| if (down) { |
| if (finger_touching == SDL_FALSE) { |
| finger_touching = SDL_TRUE; |
| track_touchid = id; |
| track_fingerid = fingerid; |
| } |
| } else { |
| if (finger_touching == SDL_TRUE && track_touchid == id && track_fingerid == fingerid) { |
| finger_touching = SDL_FALSE; |
| } |
| } |
| } |
| } |
| } |
| #endif |
| |
| /* SDL_HINT_MOUSE_TOUCH_EVENTS: if not set, discard synthetic touch events coming from platform layer */ |
| if (mouse->mouse_touch_events == 0) { |
| if (id == SDL_MOUSE_TOUCHID) { |
| return 0; |
| } |
| } |
| |
| finger = SDL_GetFinger(touch, fingerid); |
| if (down) { |
| if (finger) { |
| /* This finger is already down */ |
| return 0; |
| } |
| |
| if (SDL_AddFinger(touch, fingerid, x, y, pressure) < 0) { |
| return 0; |
| } |
| |
| posted = 0; |
| if (SDL_GetEventState(SDL_FINGERDOWN) == SDL_ENABLE) { |
| SDL_Event event; |
| event.tfinger.type = SDL_FINGERDOWN; |
| event.tfinger.touchId = id; |
| event.tfinger.fingerId = fingerid; |
| event.tfinger.x = x; |
| event.tfinger.y = y; |
| event.tfinger.dx = 0; |
| event.tfinger.dy = 0; |
| event.tfinger.pressure = pressure; |
| event.tfinger.windowID = window ? SDL_GetWindowID(window) : 0; |
| posted = (SDL_PushEvent(&event) > 0); |
| } |
| } else { |
| if (!finger) { |
| /* This finger is already up */ |
| return 0; |
| } |
| |
| posted = 0; |
| if (SDL_GetEventState(SDL_FINGERUP) == SDL_ENABLE) { |
| SDL_Event event; |
| event.tfinger.type = SDL_FINGERUP; |
| event.tfinger.touchId = id; |
| event.tfinger.fingerId = fingerid; |
| /* I don't trust the coordinates passed on fingerUp */ |
| event.tfinger.x = finger->x; |
| event.tfinger.y = finger->y; |
| event.tfinger.dx = 0; |
| event.tfinger.dy = 0; |
| event.tfinger.pressure = pressure; |
| event.tfinger.windowID = window ? SDL_GetWindowID(window) : 0; |
| posted = (SDL_PushEvent(&event) > 0); |
| } |
| |
| SDL_DelFinger(touch, fingerid); |
| } |
| return posted; |
| } |
| |
| int |
| SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid, SDL_Window * window, |
| float x, float y, float pressure) |
| { |
| SDL_Touch *touch; |
| SDL_Finger *finger; |
| SDL_Mouse *mouse; |
| int posted; |
| float xrel, yrel, prel; |
| |
| touch = SDL_GetTouch(id); |
| if (!touch) { |
| return -1; |
| } |
| |
| mouse = SDL_GetMouse(); |
| |
| #if SYNTHESIZE_TOUCH_TO_MOUSE |
| /* SDL_HINT_TOUCH_MOUSE_EVENTS: controlling whether touch events should generate synthetic mouse events */ |
| { |
| if (mouse->touch_mouse_events) { |
| if (id != SDL_MOUSE_TOUCHID) { |
| if (window) { |
| if (finger_touching == SDL_TRUE && track_touchid == id && track_fingerid == fingerid) { |
| int pos_x = (int)(x * (float)window->w); |
| int pos_y = (int)(y * (float)window->h); |
| if (pos_x < 0) pos_x = 0; |
| if (pos_x > window->w - 1) pos_x = window->w - 1; |
| if (pos_y < 0) pos_y = 0; |
| if (pos_y > window->h - 1) pos_y = window->h - 1; |
| SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y); |
| } |
| } |
| } |
| } |
| } |
| #endif |
| |
| /* SDL_HINT_MOUSE_TOUCH_EVENTS: if not set, discard synthetic touch events coming from platform layer */ |
| if (mouse->mouse_touch_events == 0) { |
| if (id == SDL_MOUSE_TOUCHID) { |
| return 0; |
| } |
| } |
| |
| finger = SDL_GetFinger(touch,fingerid); |
| if (!finger) { |
| return SDL_SendTouch(id, fingerid, window, SDL_TRUE, x, y, pressure); |
| } |
| |
| xrel = x - finger->x; |
| yrel = y - finger->y; |
| prel = pressure - finger->pressure; |
| |
| /* Drop events that don't change state */ |
| if (xrel == 0.0f && yrel == 0.0f && prel == 0.0f) { |
| #if 0 |
| printf("Touch event didn't change state - dropped!\n"); |
| #endif |
| return 0; |
| } |
| |
| /* Update internal touch coordinates */ |
| finger->x = x; |
| finger->y = y; |
| finger->pressure = pressure; |
| |
| /* Post the event, if desired */ |
| posted = 0; |
| if (SDL_GetEventState(SDL_FINGERMOTION) == SDL_ENABLE) { |
| SDL_Event event; |
| event.tfinger.type = SDL_FINGERMOTION; |
| event.tfinger.touchId = id; |
| event.tfinger.fingerId = fingerid; |
| event.tfinger.x = x; |
| event.tfinger.y = y; |
| event.tfinger.dx = xrel; |
| event.tfinger.dy = yrel; |
| event.tfinger.pressure = pressure; |
| event.tfinger.windowID = window ? SDL_GetWindowID(window) : 0; |
| posted = (SDL_PushEvent(&event) > 0); |
| } |
| return posted; |
| } |
| |
| void |
| SDL_DelTouch(SDL_TouchID id) |
| { |
| int i; |
| int index = SDL_GetTouchIndex(id); |
| SDL_Touch *touch = SDL_GetTouch(id); |
| |
| if (!touch) { |
| return; |
| } |
| |
| for (i = 0; i < touch->max_fingers; ++i) { |
| SDL_free(touch->fingers[i]); |
| } |
| SDL_free(touch->fingers); |
| SDL_free(touch); |
| |
| SDL_num_touch--; |
| SDL_touchDevices[index] = SDL_touchDevices[SDL_num_touch]; |
| |
| /* Delete this touch device for gestures */ |
| SDL_GestureDelTouch(id); |
| } |
| |
| void |
| SDL_TouchQuit(void) |
| { |
| int i; |
| |
| for (i = SDL_num_touch; i--; ) { |
| SDL_DelTouch(SDL_touchDevices[i]->id); |
| } |
| SDL_assert(SDL_num_touch == 0); |
| |
| SDL_free(SDL_touchDevices); |
| SDL_touchDevices = NULL; |
| SDL_GestureQuit(); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |