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RmlUi_Platform_SDL.cpp
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/*
* This source file is part of RmlUi, the HTML/CSS Interface Middleware
*
* For the latest information, see http://github.com/mikke89/RmlUi
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
* Copyright (c) 2019-2023 The RmlUi Team, and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "RmlUi_Platform_SDL.h"
#include <RmlUi/Core/Context.h>
#include <RmlUi/Core/Input.h>
#include <RmlUi/Core/StringUtilities.h>
#include <RmlUi/Core/SystemInterface.h>
SystemInterface_SDL::SystemInterface_SDL()
{
#if SDL_MAJOR_VERSION >= 3
cursor_default = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_DEFAULT);
cursor_move = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_MOVE);
cursor_pointer = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_POINTER);
cursor_resize = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NWSE_RESIZE);
cursor_cross = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_CROSSHAIR);
cursor_text = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_TEXT);
cursor_unavailable = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NOT_ALLOWED);
#else
cursor_default = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
cursor_move = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
cursor_pointer = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
cursor_resize = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
cursor_cross = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_CROSSHAIR);
cursor_text = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM);
cursor_unavailable = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
#endif
}
SystemInterface_SDL::~SystemInterface_SDL()
{
#if SDL_MAJOR_VERSION >= 3
auto DestroyCursor = [](SDL_Cursor* cursor) { SDL_DestroyCursor(cursor); };
#else
auto DestroyCursor = [](SDL_Cursor* cursor) { SDL_FreeCursor(cursor); };
#endif
DestroyCursor(cursor_default);
DestroyCursor(cursor_move);
DestroyCursor(cursor_pointer);
DestroyCursor(cursor_resize);
DestroyCursor(cursor_cross);
DestroyCursor(cursor_text);
DestroyCursor(cursor_unavailable);
}
void SystemInterface_SDL::SetWindow(SDL_Window* in_window)
{
window = in_window;
}
double SystemInterface_SDL::GetElapsedTime()
{
static const Uint64 start = SDL_GetPerformanceCounter();
static const double frequency = double(SDL_GetPerformanceFrequency());
return double(SDL_GetPerformanceCounter() - start) / frequency;
}
void SystemInterface_SDL::SetMouseCursor(const Rml::String& cursor_name)
{
SDL_Cursor* cursor = nullptr;
if (cursor_name.empty() || cursor_name == "arrow")
cursor = cursor_default;
else if (cursor_name == "move")
cursor = cursor_move;
else if (cursor_name == "pointer")
cursor = cursor_pointer;
else if (cursor_name == "resize")
cursor = cursor_resize;
else if (cursor_name == "cross")
cursor = cursor_cross;
else if (cursor_name == "text")
cursor = cursor_text;
else if (cursor_name == "unavailable")
cursor = cursor_unavailable;
else if (Rml::StringUtilities::StartsWith(cursor_name, "rmlui-scroll"))
cursor = cursor_move;
if (cursor)
SDL_SetCursor(cursor);
}
void SystemInterface_SDL::SetClipboardText(const Rml::String& text)
{
SDL_SetClipboardText(text.c_str());
}
void SystemInterface_SDL::GetClipboardText(Rml::String& text)
{
char* raw_text = SDL_GetClipboardText();
text = Rml::String(raw_text);
SDL_free(raw_text);
}
void SystemInterface_SDL::ActivateKeyboard(Rml::Vector2f caret_position, float line_height)
{
if (window)
{
#if SDL_MAJOR_VERSION >= 3
const SDL_Rect rect = {int(caret_position.x), int(caret_position.y), 1, int(line_height)};
SDL_SetTextInputArea(window, &rect, 0);
SDL_StartTextInput(window);
#else
(void)caret_position;
(void)line_height;
SDL_StartTextInput();
#endif
}
}
void SystemInterface_SDL::DeactivateKeyboard()
{
if (window)
{
#if SDL_MAJOR_VERSION >= 3
SDL_StopTextInput(window);
#else
SDL_StopTextInput();
#endif
}
}
bool RmlSDL::InputEventHandler(Rml::Context* context, SDL_Window* window, SDL_Event& ev)
{
#if SDL_MAJOR_VERSION >= 3
#define RMLSDL_WINDOW_EVENTS_BEGIN
#define RMLSDL_WINDOW_EVENTS_END
auto GetKey = [](const SDL_Event& event) { return event.key.key; };
constexpr auto event_mouse_motion = SDL_EVENT_MOUSE_MOTION;
constexpr auto event_mouse_down = SDL_EVENT_MOUSE_BUTTON_DOWN;
constexpr auto event_mouse_up = SDL_EVENT_MOUSE_BUTTON_UP;
constexpr auto event_mouse_wheel = SDL_EVENT_MOUSE_WHEEL;
constexpr auto event_key_down = SDL_EVENT_KEY_DOWN;
constexpr auto event_key_up = SDL_EVENT_KEY_UP;
constexpr auto event_text_input = SDL_EVENT_TEXT_INPUT;
constexpr auto event_window_size_changed = SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED;
constexpr auto event_window_leave = SDL_EVENT_WINDOW_MOUSE_LEAVE;
constexpr auto rmlsdl_true = true;
constexpr auto rmlsdl_false = false;
#else
(void)window;
#define RMLSDL_WINDOW_EVENTS_BEGIN \
case SDL_WINDOWEVENT: \
{ \
switch (ev.window.event) \
{
#define RMLSDL_WINDOW_EVENTS_END \
} \
} \
break;
auto GetKey = [](const SDL_Event& event) { return event.key.keysym.sym; };
constexpr auto event_mouse_motion = SDL_MOUSEMOTION;
constexpr auto event_mouse_down = SDL_MOUSEBUTTONDOWN;
constexpr auto event_mouse_up = SDL_MOUSEBUTTONUP;
constexpr auto event_mouse_wheel = SDL_MOUSEWHEEL;
constexpr auto event_key_down = SDL_KEYDOWN;
constexpr auto event_key_up = SDL_KEYUP;
constexpr auto event_text_input = SDL_TEXTINPUT;
constexpr auto event_window_size_changed = SDL_WINDOWEVENT_SIZE_CHANGED;
constexpr auto event_window_leave = SDL_WINDOWEVENT_LEAVE;
constexpr auto rmlsdl_true = SDL_TRUE;
constexpr auto rmlsdl_false = SDL_FALSE;
#endif
bool result = true;
switch (ev.type)
{
case event_mouse_motion:
{
result = context->ProcessMouseMove(int(ev.motion.x), int(ev.motion.y), GetKeyModifierState());
}
break;
case event_mouse_down:
{
result = context->ProcessMouseButtonDown(ConvertMouseButton(ev.button.button), GetKeyModifierState());
SDL_CaptureMouse(rmlsdl_true);
}
break;
case event_mouse_up:
{
SDL_CaptureMouse(rmlsdl_false);
result = context->ProcessMouseButtonUp(ConvertMouseButton(ev.button.button), GetKeyModifierState());
}
break;
case event_mouse_wheel:
{
result = context->ProcessMouseWheel(float(-ev.wheel.y), GetKeyModifierState());
}
break;
case event_key_down:
{
result = context->ProcessKeyDown(ConvertKey(GetKey(ev)), GetKeyModifierState());
if (GetKey(ev) == SDLK_RETURN || GetKey(ev) == SDLK_KP_ENTER)
result &= context->ProcessTextInput('\n');
}
break;
case event_key_up:
{
result = context->ProcessKeyUp(ConvertKey(GetKey(ev)), GetKeyModifierState());
}
break;
case event_text_input:
{
result = context->ProcessTextInput(Rml::String(&ev.text.text[0]));
}
break;
RMLSDL_WINDOW_EVENTS_BEGIN
case event_window_size_changed:
{
Rml::Vector2i dimensions(ev.window.data1, ev.window.data2);
context->SetDimensions(dimensions);
}
break;
case event_window_leave:
{
context->ProcessMouseLeave();
}
break;
#if SDL_MAJOR_VERSION >= 3
case SDL_EVENT_WINDOW_DISPLAY_SCALE_CHANGED:
{
const float display_scale = SDL_GetWindowDisplayScale(window);
context->SetDensityIndependentPixelRatio(display_scale);
}
break;
#endif
RMLSDL_WINDOW_EVENTS_END
default: break;
}
return result;
}
Rml::Input::KeyIdentifier RmlSDL::ConvertKey(int sdlkey)
{
#if SDL_MAJOR_VERSION >= 3
constexpr auto key_a = SDLK_A;
constexpr auto key_b = SDLK_B;
constexpr auto key_c = SDLK_C;
constexpr auto key_d = SDLK_D;
constexpr auto key_e = SDLK_E;
constexpr auto key_f = SDLK_F;
constexpr auto key_g = SDLK_G;
constexpr auto key_h = SDLK_H;
constexpr auto key_i = SDLK_I;
constexpr auto key_j = SDLK_J;
constexpr auto key_k = SDLK_K;
constexpr auto key_l = SDLK_L;
constexpr auto key_m = SDLK_M;
constexpr auto key_n = SDLK_N;
constexpr auto key_o = SDLK_O;
constexpr auto key_p = SDLK_P;
constexpr auto key_q = SDLK_Q;
constexpr auto key_r = SDLK_R;
constexpr auto key_s = SDLK_S;
constexpr auto key_t = SDLK_T;
constexpr auto key_u = SDLK_U;
constexpr auto key_v = SDLK_V;
constexpr auto key_w = SDLK_W;
constexpr auto key_x = SDLK_X;
constexpr auto key_y = SDLK_Y;
constexpr auto key_z = SDLK_Z;
constexpr auto key_grave = SDLK_GRAVE;
constexpr auto key_dblapostrophe = SDLK_DBLAPOSTROPHE;
#else
constexpr auto key_a = SDLK_a;
constexpr auto key_b = SDLK_b;
constexpr auto key_c = SDLK_c;
constexpr auto key_d = SDLK_d;
constexpr auto key_e = SDLK_e;
constexpr auto key_f = SDLK_f;
constexpr auto key_g = SDLK_g;
constexpr auto key_h = SDLK_h;
constexpr auto key_i = SDLK_i;
constexpr auto key_j = SDLK_j;
constexpr auto key_k = SDLK_k;
constexpr auto key_l = SDLK_l;
constexpr auto key_m = SDLK_m;
constexpr auto key_n = SDLK_n;
constexpr auto key_o = SDLK_o;
constexpr auto key_p = SDLK_p;
constexpr auto key_q = SDLK_q;
constexpr auto key_r = SDLK_r;
constexpr auto key_s = SDLK_s;
constexpr auto key_t = SDLK_t;
constexpr auto key_u = SDLK_u;
constexpr auto key_v = SDLK_v;
constexpr auto key_w = SDLK_w;
constexpr auto key_x = SDLK_x;
constexpr auto key_y = SDLK_y;
constexpr auto key_z = SDLK_z;
constexpr auto key_grave = SDLK_BACKQUOTE;
constexpr auto key_dblapostrophe = SDLK_QUOTEDBL;
#endif
// clang-format off
switch (sdlkey)
{
case SDLK_UNKNOWN: return Rml::Input::KI_UNKNOWN;
case SDLK_ESCAPE: return Rml::Input::KI_ESCAPE;
case SDLK_SPACE: return Rml::Input::KI_SPACE;
case SDLK_0: return Rml::Input::KI_0;
case SDLK_1: return Rml::Input::KI_1;
case SDLK_2: return Rml::Input::KI_2;
case SDLK_3: return Rml::Input::KI_3;
case SDLK_4: return Rml::Input::KI_4;
case SDLK_5: return Rml::Input::KI_5;
case SDLK_6: return Rml::Input::KI_6;
case SDLK_7: return Rml::Input::KI_7;
case SDLK_8: return Rml::Input::KI_8;
case SDLK_9: return Rml::Input::KI_9;
case key_a: return Rml::Input::KI_A;
case key_b: return Rml::Input::KI_B;
case key_c: return Rml::Input::KI_C;
case key_d: return Rml::Input::KI_D;
case key_e: return Rml::Input::KI_E;
case key_f: return Rml::Input::KI_F;
case key_g: return Rml::Input::KI_G;
case key_h: return Rml::Input::KI_H;
case key_i: return Rml::Input::KI_I;
case key_j: return Rml::Input::KI_J;
case key_k: return Rml::Input::KI_K;
case key_l: return Rml::Input::KI_L;
case key_m: return Rml::Input::KI_M;
case key_n: return Rml::Input::KI_N;
case key_o: return Rml::Input::KI_O;
case key_p: return Rml::Input::KI_P;
case key_q: return Rml::Input::KI_Q;
case key_r: return Rml::Input::KI_R;
case key_s: return Rml::Input::KI_S;
case key_t: return Rml::Input::KI_T;
case key_u: return Rml::Input::KI_U;
case key_v: return Rml::Input::KI_V;
case key_w: return Rml::Input::KI_W;
case key_x: return Rml::Input::KI_X;
case key_y: return Rml::Input::KI_Y;
case key_z: return Rml::Input::KI_Z;
case SDLK_SEMICOLON: return Rml::Input::KI_OEM_1;
case SDLK_PLUS: return Rml::Input::KI_OEM_PLUS;
case SDLK_COMMA: return Rml::Input::KI_OEM_COMMA;
case SDLK_MINUS: return Rml::Input::KI_OEM_MINUS;
case SDLK_PERIOD: return Rml::Input::KI_OEM_PERIOD;
case SDLK_SLASH: return Rml::Input::KI_OEM_2;
case key_grave: return Rml::Input::KI_OEM_3;
case SDLK_LEFTBRACKET: return Rml::Input::KI_OEM_4;
case SDLK_BACKSLASH: return Rml::Input::KI_OEM_5;
case SDLK_RIGHTBRACKET: return Rml::Input::KI_OEM_6;
case key_dblapostrophe: return Rml::Input::KI_OEM_7;
case SDLK_KP_0: return Rml::Input::KI_NUMPAD0;
case SDLK_KP_1: return Rml::Input::KI_NUMPAD1;
case SDLK_KP_2: return Rml::Input::KI_NUMPAD2;
case SDLK_KP_3: return Rml::Input::KI_NUMPAD3;
case SDLK_KP_4: return Rml::Input::KI_NUMPAD4;
case SDLK_KP_5: return Rml::Input::KI_NUMPAD5;
case SDLK_KP_6: return Rml::Input::KI_NUMPAD6;
case SDLK_KP_7: return Rml::Input::KI_NUMPAD7;
case SDLK_KP_8: return Rml::Input::KI_NUMPAD8;
case SDLK_KP_9: return Rml::Input::KI_NUMPAD9;
case SDLK_KP_ENTER: return Rml::Input::KI_NUMPADENTER;
case SDLK_KP_MULTIPLY: return Rml::Input::KI_MULTIPLY;
case SDLK_KP_PLUS: return Rml::Input::KI_ADD;
case SDLK_KP_MINUS: return Rml::Input::KI_SUBTRACT;
case SDLK_KP_PERIOD: return Rml::Input::KI_DECIMAL;
case SDLK_KP_DIVIDE: return Rml::Input::KI_DIVIDE;
case SDLK_KP_EQUALS: return Rml::Input::KI_OEM_NEC_EQUAL;
case SDLK_BACKSPACE: return Rml::Input::KI_BACK;
case SDLK_TAB: return Rml::Input::KI_TAB;
case SDLK_CLEAR: return Rml::Input::KI_CLEAR;
case SDLK_RETURN: return Rml::Input::KI_RETURN;
case SDLK_PAUSE: return Rml::Input::KI_PAUSE;
case SDLK_CAPSLOCK: return Rml::Input::KI_CAPITAL;
case SDLK_PAGEUP: return Rml::Input::KI_PRIOR;
case SDLK_PAGEDOWN: return Rml::Input::KI_NEXT;
case SDLK_END: return Rml::Input::KI_END;
case SDLK_HOME: return Rml::Input::KI_HOME;
case SDLK_LEFT: return Rml::Input::KI_LEFT;
case SDLK_UP: return Rml::Input::KI_UP;
case SDLK_RIGHT: return Rml::Input::KI_RIGHT;
case SDLK_DOWN: return Rml::Input::KI_DOWN;
case SDLK_INSERT: return Rml::Input::KI_INSERT;
case SDLK_DELETE: return Rml::Input::KI_DELETE;
case SDLK_HELP: return Rml::Input::KI_HELP;
case SDLK_F1: return Rml::Input::KI_F1;
case SDLK_F2: return Rml::Input::KI_F2;
case SDLK_F3: return Rml::Input::KI_F3;
case SDLK_F4: return Rml::Input::KI_F4;
case SDLK_F5: return Rml::Input::KI_F5;
case SDLK_F6: return Rml::Input::KI_F6;
case SDLK_F7: return Rml::Input::KI_F7;
case SDLK_F8: return Rml::Input::KI_F8;
case SDLK_F9: return Rml::Input::KI_F9;
case SDLK_F10: return Rml::Input::KI_F10;
case SDLK_F11: return Rml::Input::KI_F11;
case SDLK_F12: return Rml::Input::KI_F12;
case SDLK_F13: return Rml::Input::KI_F13;
case SDLK_F14: return Rml::Input::KI_F14;
case SDLK_F15: return Rml::Input::KI_F15;
case SDLK_NUMLOCKCLEAR: return Rml::Input::KI_NUMLOCK;
case SDLK_SCROLLLOCK: return Rml::Input::KI_SCROLL;
case SDLK_LSHIFT: return Rml::Input::KI_LSHIFT;
case SDLK_RSHIFT: return Rml::Input::KI_RSHIFT;
case SDLK_LCTRL: return Rml::Input::KI_LCONTROL;
case SDLK_RCTRL: return Rml::Input::KI_RCONTROL;
case SDLK_LALT: return Rml::Input::KI_LMENU;
case SDLK_RALT: return Rml::Input::KI_RMENU;
case SDLK_LGUI: return Rml::Input::KI_LMETA;
case SDLK_RGUI: return Rml::Input::KI_RMETA;
/*
case SDLK_LSUPER: return Rml::Input::KI_LWIN;
case SDLK_RSUPER: return Rml::Input::KI_RWIN;
*/
default: break;
}
// clang-format on
return Rml::Input::KI_UNKNOWN;
}
int RmlSDL::ConvertMouseButton(int button)
{
switch (button)
{
case SDL_BUTTON_LEFT: return 0;
case SDL_BUTTON_RIGHT: return 1;
case SDL_BUTTON_MIDDLE: return 2;
default: return 3;
}
}
int RmlSDL::GetKeyModifierState()
{
SDL_Keymod sdl_mods = SDL_GetModState();
#if SDL_MAJOR_VERSION >= 3
constexpr auto mod_ctrl = SDL_KMOD_CTRL;
constexpr auto mod_shift = SDL_KMOD_SHIFT;
constexpr auto mod_alt = SDL_KMOD_ALT;
constexpr auto mod_num = SDL_KMOD_NUM;
constexpr auto mod_caps = SDL_KMOD_CAPS;
#else
constexpr auto mod_ctrl = KMOD_CTRL;
constexpr auto mod_shift = KMOD_SHIFT;
constexpr auto mod_alt = KMOD_ALT;
constexpr auto mod_num = KMOD_NUM;
constexpr auto mod_caps = KMOD_CAPS;
#endif
int retval = 0;
if (sdl_mods & mod_ctrl)
retval |= Rml::Input::KM_CTRL;
if (sdl_mods & mod_shift)
retval |= Rml::Input::KM_SHIFT;
if (sdl_mods & mod_alt)
retval |= Rml::Input::KM_ALT;
if (sdl_mods & mod_num)
retval |= Rml::Input::KM_NUMLOCK;
if (sdl_mods & mod_caps)
retval |= Rml::Input::KM_CAPSLOCK;
return retval;
}