src/video/mir/SDL_mirevents.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2016 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.
 */

 /*
   Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
 */

 #include "../../SDL_internal.h"

 #if SDL_VIDEO_DRIVER_MIR

 #include "../../events/SDL_events_c.h"
 #include "../../events/SDL_keyboard_c.h"
 #include "../../events/SDL_touch_c.h"
 #include "../../events/scancodes_xfree86.h"

 #include "SDL_mirevents.h"
 #include "SDL_mirwindow.h"

 #include <xkbcommon/xkbcommon.h>

 #include "SDL_mirdyn.h"

 static void
 HandleKeyText(int32_t key_code)
 {
     char text[8];
     int size = 0;

     size = MIR_xkb_keysym_to_utf8(key_code, text, sizeof text);

     if (size > 0) {
         text[size] = '\0';
         SDL_SendKeyboardText(text);
     }
 }

 /* FIXME
    Mir still needs to implement its IM API, for now we assume
    a single key press produces a character.
 */
 static void
 HandleKeyEvent(MirKeyboardEvent const* key_event, SDL_Window* window)
 {
     xkb_keysym_t key_code;
     Uint8 key_state;
     int event_scancode;
     uint32_t sdl_scancode = SDL_SCANCODE_UNKNOWN;

     MirKeyboardAction action = MIR_mir_keyboard_event_action(key_event);

     key_state      = SDL_PRESSED;
     key_code       = MIR_mir_keyboard_event_key_code(key_event);
     event_scancode = MIR_mir_keyboard_event_scan_code(key_event);

     if (action == mir_keyboard_action_up)
         key_state = SDL_RELEASED;

     if (event_scancode < SDL_arraysize(xfree86_scancode_table2))
         sdl_scancode = xfree86_scancode_table2[event_scancode];

     if (sdl_scancode != SDL_SCANCODE_UNKNOWN)
         SDL_SendKeyboardKey(key_state, sdl_scancode);

     if (key_state == SDL_PRESSED)
         HandleKeyText(key_code);
 }

 static void
 HandleMouseButton(SDL_Window* sdl_window, Uint8 state, MirPointerEvent const* pointer)
 {
     uint32_t sdl_button           = SDL_BUTTON_LEFT;
     MirPointerButton button_state = mir_pointer_button_primary;

     static uint32_t old_button_states = 0;
     uint32_t new_button_states = MIR_mir_pointer_event_buttons(pointer);

     // XOR on our old button states vs our new states to get the newley pressed/released button
     button_state = new_button_states ^ old_button_states;

     switch (button_state) {
         case mir_pointer_button_primary:
             sdl_button = SDL_BUTTON_LEFT;
             break;
         case mir_pointer_button_secondary:
             sdl_button = SDL_BUTTON_RIGHT;
             break;
         case mir_pointer_button_tertiary:
             sdl_button = SDL_BUTTON_MIDDLE;
             break;
         case mir_pointer_button_forward:
             sdl_button = SDL_BUTTON_X1;
             break;
         case mir_pointer_button_back:
             sdl_button = SDL_BUTTON_X2;
             break;
         default:
             break;
     }

     old_button_states = new_button_states;

     SDL_SendMouseButton(sdl_window, 0, state, sdl_button);
 }

 static void
 HandleMouseMotion(SDL_Window* sdl_window, int x, int y)
 {
     SDL_Mouse* mouse = SDL_GetMouse();
     SDL_SendMouseMotion(sdl_window, 0, mouse->relative_mode, x, y);
 }

 static void
 HandleTouchPress(int device_id, int source_id, SDL_bool down, float x, float y, float pressure)
 {
     SDL_SendTouch(device_id, source_id, down, x, y, pressure);
 }

 static void
 HandleTouchMotion(int device_id, int source_id, float x, float y, float pressure)
 {
     SDL_SendTouchMotion(device_id, source_id, x, y, pressure);
 }

 static void
 HandleMouseScroll(SDL_Window* sdl_window, int hscroll, int vscroll)
 {
     SDL_SendMouseWheel(sdl_window, 0, hscroll, vscroll, SDL_MOUSEWHEEL_NORMAL);
 }

 static void
 AddTouchDevice(int device_id)
 {
     if (SDL_AddTouch(device_id, "") < 0)
         SDL_SetError("Error: can't add touch %s, %d", __FILE__, __LINE__);
 }

 static void
 HandleTouchEvent(MirTouchEvent const* touch, int device_id, SDL_Window* sdl_window)
 {
     int i, point_count;
     point_count = MIR_mir_touch_event_point_count(touch);

     AddTouchDevice(device_id);

     for (i = 0; i < point_count; i++) {
         int id = MIR_mir_touch_event_id(touch, i);

         int width  = sdl_window->w;
         int height = sdl_window->h;

         float x = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_x);
         float y = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_y);

         float n_x = x / width;
         float n_y = y / height;

         float pressure = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_pressure);

         switch (MIR_mir_touch_event_action(touch, i)) {
             case mir_touch_action_up:
                 HandleTouchPress(device_id, id, SDL_FALSE, n_x, n_y, pressure);
                 break;
             case mir_touch_action_down:
                 HandleTouchPress(device_id, id, SDL_TRUE, n_x, n_y, pressure);
                 break;
             case mir_touch_action_change:
                 HandleTouchMotion(device_id, id, n_x, n_y, pressure);
                 break;
             case mir_touch_actions:
                 break;
         }
     }
 }

 static void
 HandleMouseEvent(MirPointerEvent const* pointer, SDL_Window* sdl_window)
 {
     SDL_SetMouseFocus(sdl_window);

     switch (MIR_mir_pointer_event_action(pointer)) {
         case mir_pointer_action_button_down:
             HandleMouseButton(sdl_window, SDL_PRESSED, pointer);
             break;
         case mir_pointer_action_button_up:
             HandleMouseButton(sdl_window, SDL_RELEASED, pointer);
             break;
         case mir_pointer_action_motion: {
             int x, y;
             int hscroll, vscroll;
             SDL_Mouse* mouse = SDL_GetMouse();
             x = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_x);
             y = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_y);

             if (mouse) {
                 if (mouse->relative_mode) {
                     int relative_x = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_relative_x);
                     int relative_y = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_relative_y);
                     HandleMouseMotion(sdl_window, relative_x, relative_y);
                 }
                 else if (mouse->x != x || mouse->y != y) {
                     HandleMouseMotion(sdl_window, x, y);
                 }
             }

             hscroll = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_hscroll);
             vscroll = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_vscroll);
             if (vscroll != 0 || hscroll != 0)
                 HandleMouseScroll(sdl_window, hscroll, vscroll);
         }
             break;
         case mir_pointer_action_leave:
             SDL_SetMouseFocus(NULL);
             break;
         case mir_pointer_action_enter:
         default:
             break;
     }
 }

 static void
 MIR_HandleInput(MirInputEvent const* input_event, SDL_Window* window)
 {
     switch (MIR_mir_input_event_get_type(input_event)) {
         case (mir_input_event_type_key):
             HandleKeyEvent(MIR_mir_input_event_get_keyboard_event(input_event), window);
             break;
         case (mir_input_event_type_pointer):
             HandleMouseEvent(MIR_mir_input_event_get_pointer_event(input_event), window);
             break;
         case (mir_input_event_type_touch):
             HandleTouchEvent(MIR_mir_input_event_get_touch_event(input_event),
                              MIR_mir_input_event_get_device_id(input_event),
                              window);
             break;
         default:
             break;
     }
 }

 static void
 MIR_HandleResize(MirResizeEvent const* resize_event, SDL_Window* window)
 {
     int new_w = MIR_mir_resize_event_get_width (resize_event);
     int new_h = MIR_mir_resize_event_get_height(resize_event);

     int old_w = window->w;
     int old_h = window->h;

     if (new_w != old_w || new_h != old_h)
         SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, new_w, new_h);
 }

 static void
 MIR_HandleSurface(MirSurfaceEvent const* surface_event, SDL_Window* window)
 {
     MirSurfaceAttrib attrib = MIR_mir_surface_event_get_attribute(surface_event);
     int value               = MIR_mir_surface_event_get_attribute_value(surface_event);

     if (attrib == mir_surface_attrib_focus) {
         if (value == mir_surface_focused) {
             SDL_SetKeyboardFocus(window);
         }
         else if (value == mir_surface_unfocused) {
             SDL_SetKeyboardFocus(NULL);
         }
     }
 }

 void
 MIR_HandleEvent(MirSurface* surface, MirEvent const* ev, void* context)
 {
     MirEventType event_type = MIR_mir_event_get_type(ev);
     SDL_Window* window      = (SDL_Window*)context;

     if (window) {
         switch (event_type) {
             case (mir_event_type_input):
                 MIR_HandleInput(MIR_mir_event_get_input_event(ev), window);
                 break;
             case (mir_event_type_resize):
                 MIR_HandleResize(MIR_mir_event_get_resize_event(ev), window);
                 break;
             case (mir_event_type_surface):
                 MIR_HandleSurface(MIR_mir_event_get_surface_event(ev), window);
                 break;
             default:
                 break;
         }
     }
 }

 #endif /* SDL_VIDEO_DRIVER_MIR */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2016 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.
	*/

	/*
	Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
	*/

	#include "../../SDL_internal.h"

	#if SDL_VIDEO_DRIVER_MIR

	#include "../../events/SDL_events_c.h"
	#include "../../events/SDL_keyboard_c.h"
	#include "../../events/SDL_touch_c.h"
	#include "../../events/scancodes_xfree86.h"

	#include "SDL_mirevents.h"
	#include "SDL_mirwindow.h"

	#include <xkbcommon/xkbcommon.h>

	#include "SDL_mirdyn.h"

	static void
	HandleKeyText(int32_t key_code)
	{
	char text[8];
	int size = 0;

	size = MIR_xkb_keysym_to_utf8(key_code, text, sizeof text);

	if (size > 0) {
	text[size] = '\0';
	SDL_SendKeyboardText(text);
	}
	}

	/* FIXME
	Mir still needs to implement its IM API, for now we assume
	a single key press produces a character.
	*/
	static void
	HandleKeyEvent(MirKeyboardEvent const* key_event, SDL_Window* window)
	{
	xkb_keysym_t key_code;
	Uint8 key_state;
	int event_scancode;
	uint32_t sdl_scancode = SDL_SCANCODE_UNKNOWN;

	MirKeyboardAction action = MIR_mir_keyboard_event_action(key_event);

	key_state = SDL_PRESSED;
	key_code = MIR_mir_keyboard_event_key_code(key_event);
	event_scancode = MIR_mir_keyboard_event_scan_code(key_event);

	if (action == mir_keyboard_action_up)
	key_state = SDL_RELEASED;

	if (event_scancode < SDL_arraysize(xfree86_scancode_table2))
	sdl_scancode = xfree86_scancode_table2[event_scancode];

	if (sdl_scancode != SDL_SCANCODE_UNKNOWN)
	SDL_SendKeyboardKey(key_state, sdl_scancode);

	if (key_state == SDL_PRESSED)
	HandleKeyText(key_code);
	}

	static void
	HandleMouseButton(SDL_Window* sdl_window, Uint8 state, MirPointerEvent const* pointer)
	{
	uint32_t sdl_button = SDL_BUTTON_LEFT;
	MirPointerButton button_state = mir_pointer_button_primary;

	static uint32_t old_button_states = 0;
	uint32_t new_button_states = MIR_mir_pointer_event_buttons(pointer);

	// XOR on our old button states vs our new states to get the newley pressed/released button
	button_state = new_button_states ^ old_button_states;

	switch (button_state) {
	case mir_pointer_button_primary:
	sdl_button = SDL_BUTTON_LEFT;
	break;
	case mir_pointer_button_secondary:
	sdl_button = SDL_BUTTON_RIGHT;
	break;
	case mir_pointer_button_tertiary:
	sdl_button = SDL_BUTTON_MIDDLE;
	break;
	case mir_pointer_button_forward:
	sdl_button = SDL_BUTTON_X1;
	break;
	case mir_pointer_button_back:
	sdl_button = SDL_BUTTON_X2;
	break;
	default:
	break;
	}

	old_button_states = new_button_states;

	SDL_SendMouseButton(sdl_window, 0, state, sdl_button);
	}

	static void
	HandleMouseMotion(SDL_Window* sdl_window, int x, int y)
	{
	SDL_Mouse* mouse = SDL_GetMouse();
	SDL_SendMouseMotion(sdl_window, 0, mouse->relative_mode, x, y);
	}

	static void
	HandleTouchPress(int device_id, int source_id, SDL_bool down, float x, float y, float pressure)
	{
	SDL_SendTouch(device_id, source_id, down, x, y, pressure);
	}

	static void
	HandleTouchMotion(int device_id, int source_id, float x, float y, float pressure)
	{
	SDL_SendTouchMotion(device_id, source_id, x, y, pressure);
	}

	static void
	HandleMouseScroll(SDL_Window* sdl_window, int hscroll, int vscroll)
	{
	SDL_SendMouseWheel(sdl_window, 0, hscroll, vscroll, SDL_MOUSEWHEEL_NORMAL);
	}

	static void
	AddTouchDevice(int device_id)
	{
	if (SDL_AddTouch(device_id, "") < 0)
	SDL_SetError("Error: can't add touch %s, %d", __FILE__, __LINE__);
	}

	static void
	HandleTouchEvent(MirTouchEvent const* touch, int device_id, SDL_Window* sdl_window)
	{
	int i, point_count;
	point_count = MIR_mir_touch_event_point_count(touch);

	AddTouchDevice(device_id);

	for (i = 0; i < point_count; i++) {
	int id = MIR_mir_touch_event_id(touch, i);

	int width = sdl_window->w;
	int height = sdl_window->h;

	float x = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_x);
	float y = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_y);

	float n_x = x / width;
	float n_y = y / height;

	float pressure = MIR_mir_touch_event_axis_value(touch, i, mir_touch_axis_pressure);

	switch (MIR_mir_touch_event_action(touch, i)) {
	case mir_touch_action_up:
	HandleTouchPress(device_id, id, SDL_FALSE, n_x, n_y, pressure);
	break;
	case mir_touch_action_down:
	HandleTouchPress(device_id, id, SDL_TRUE, n_x, n_y, pressure);
	break;
	case mir_touch_action_change:
	HandleTouchMotion(device_id, id, n_x, n_y, pressure);
	break;
	case mir_touch_actions:
	break;
	}
	}
	}

	static void
	HandleMouseEvent(MirPointerEvent const* pointer, SDL_Window* sdl_window)
	{
	SDL_SetMouseFocus(sdl_window);

	switch (MIR_mir_pointer_event_action(pointer)) {
	case mir_pointer_action_button_down:
	HandleMouseButton(sdl_window, SDL_PRESSED, pointer);
	break;
	case mir_pointer_action_button_up:
	HandleMouseButton(sdl_window, SDL_RELEASED, pointer);
	break;
	case mir_pointer_action_motion: {
	int x, y;
	int hscroll, vscroll;
	SDL_Mouse* mouse = SDL_GetMouse();
	x = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_x);
	y = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_y);

	if (mouse) {
	if (mouse->relative_mode) {
	int relative_x = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_relative_x);
	int relative_y = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_relative_y);
	HandleMouseMotion(sdl_window, relative_x, relative_y);
	}
	else if (mouse->x != x \|\| mouse->y != y) {
	HandleMouseMotion(sdl_window, x, y);
	}
	}

	hscroll = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_hscroll);
	vscroll = MIR_mir_pointer_event_axis_value(pointer, mir_pointer_axis_vscroll);
	if (vscroll != 0 \|\| hscroll != 0)
	HandleMouseScroll(sdl_window, hscroll, vscroll);
	}
	break;
	case mir_pointer_action_leave:
	SDL_SetMouseFocus(NULL);
	break;
	case mir_pointer_action_enter:
	default:
	break;
	}
	}

	static void
	MIR_HandleInput(MirInputEvent const* input_event, SDL_Window* window)
	{
	switch (MIR_mir_input_event_get_type(input_event)) {
	case (mir_input_event_type_key):
	HandleKeyEvent(MIR_mir_input_event_get_keyboard_event(input_event), window);
	break;
	case (mir_input_event_type_pointer):
	HandleMouseEvent(MIR_mir_input_event_get_pointer_event(input_event), window);
	break;
	case (mir_input_event_type_touch):
	HandleTouchEvent(MIR_mir_input_event_get_touch_event(input_event),
	MIR_mir_input_event_get_device_id(input_event),
	window);
	break;
	default:
	break;
	}
	}

	static void
	MIR_HandleResize(MirResizeEvent const* resize_event, SDL_Window* window)
	{
	int new_w = MIR_mir_resize_event_get_width (resize_event);
	int new_h = MIR_mir_resize_event_get_height(resize_event);

	int old_w = window->w;
	int old_h = window->h;

	if (new_w != old_w \|\| new_h != old_h)
	SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, new_w, new_h);
	}

	static void
	MIR_HandleSurface(MirSurfaceEvent const* surface_event, SDL_Window* window)
	{
	MirSurfaceAttrib attrib = MIR_mir_surface_event_get_attribute(surface_event);
	int value = MIR_mir_surface_event_get_attribute_value(surface_event);

	if (attrib == mir_surface_attrib_focus) {
	if (value == mir_surface_focused) {
	SDL_SetKeyboardFocus(window);
	}
	else if (value == mir_surface_unfocused) {
	SDL_SetKeyboardFocus(NULL);
	}
	}
	}

	void
	MIR_HandleEvent(MirSurface* surface, MirEvent const* ev, void* context)
	{
	MirEventType event_type = MIR_mir_event_get_type(ev);
	SDL_Window* window = (SDL_Window*)context;

	if (window) {
	switch (event_type) {
	case (mir_event_type_input):
	MIR_HandleInput(MIR_mir_event_get_input_event(ev), window);
	break;
	case (mir_event_type_resize):
	MIR_HandleResize(MIR_mir_event_get_resize_event(ev), window);
	break;
	case (mir_event_type_surface):
	MIR_HandleSurface(MIR_mir_event_get_surface_event(ev), window);
	break;
	default:
	break;
	}
	}
	}

	#endif /* SDL_VIDEO_DRIVER_MIR */

	/* vi: set ts=4 sw=4 expandtab: */