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//-----------------------------------------------------------------------------
// The Emscripten-based implementation of platform-dependent GUI functionality.
//
// Copyright 2018 whitequark
//-----------------------------------------------------------------------------
#include <emscripten.h>
#include <emscripten/val.h>
#include <emscripten/html5.h>
#include <emscripten/bind.h>
#include "config.h"
#include "solvespace.h"
using namespace emscripten;
EMSCRIPTEN_BINDINGS(solvespace) {
emscripten::class_<std::function<void()>>("VoidFunctor")
.constructor<>()
.function("opcall", &std::function<void()>::operator());
emscripten::class_<std::function<void(val)>>("Void1Functor")
.constructor<>()
.function("opcall", &std::function<void(val)>::operator());
}
namespace SolveSpace {
namespace Platform {
//-----------------------------------------------------------------------------
// Emscripten API bridging
//-----------------------------------------------------------------------------
#define sscheck(expr) do { \
EMSCRIPTEN_RESULT emResult = (EMSCRIPTEN_RESULT)(expr); \
if(emResult < 0) \
HandleError(__FILE__, __LINE__, __func__, #expr, emResult); \
} while(0)
static void HandleError(const char *file, int line, const char *function, const char *expr,
EMSCRIPTEN_RESULT emResult) {
const char *error = "Unknown error";
switch(emResult) {
case EMSCRIPTEN_RESULT_DEFERRED: error = "Deferred"; break;
case EMSCRIPTEN_RESULT_NOT_SUPPORTED: error = "Not supported"; break;
case EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED: error = "Failed (not deferred)"; break;
case EMSCRIPTEN_RESULT_INVALID_TARGET: error = "Invalid target"; break;
case EMSCRIPTEN_RESULT_UNKNOWN_TARGET: error = "Unknown target"; break;
case EMSCRIPTEN_RESULT_INVALID_PARAM: error = "Invalid parameter"; break;
case EMSCRIPTEN_RESULT_FAILED: error = "Failed"; break;
case EMSCRIPTEN_RESULT_NO_DATA: error = "No data"; break;
}
std::string message;
message += ssprintf("File %s, line %u, function %s:\n", file, line, function);
message += ssprintf("Emscripten API call failed: %s.\n", expr);
message += ssprintf("Error: %s\n", error);
FatalError(message);
}
static val Wrap(const std::function<void()> &functor) {
return val(functor)["opcall"].call<val>("bind", val(functor));
}
static void RegisterEventListener(const val &target, std::string event, std::function<void()> functor) {
std::function<void(val)> wrapper = [functor](val) { if(functor) functor(); };
val wrapped = val(wrapper)["opcall"].call<val>("bind", val(wrapper));
target.call<void>("addEventListener", event, wrapped);
}
//-----------------------------------------------------------------------------
// Fatal errors
//-----------------------------------------------------------------------------
void FatalError(const std::string &message) {
dbp("%s", message.c_str());
#ifndef NDEBUG
emscripten_debugger();
#endif
abort();
}
//-----------------------------------------------------------------------------
// Settings
//-----------------------------------------------------------------------------
class SettingsImplHtml : public Settings {
public:
void FreezeInt(const std::string &key, uint32_t value) {
val::global("localStorage").call<void>("setItem", key, value);
}
uint32_t ThawInt(const std::string &key, uint32_t defaultValue = 0) {
val value = val::global("localStorage").call<val>("getItem", key);
if(value == val::null())
return defaultValue;
return val::global("parseInt")(value, 0).as<int>();
}
void FreezeFloat(const std::string &key, double value) {
val::global("localStorage").call<void>("setItem", key, value);
}
double ThawFloat(const std::string &key, double defaultValue = 0.0) {
val value = val::global("localStorage").call<val>("getItem", key);
if(value == val::null())
return defaultValue;
return val::global("parseFloat")(value).as<double>();
}
void FreezeString(const std::string &key, const std::string &value) {
val::global("localStorage").call<void>("setItem", key, value);
}
std::string ThawString(const std::string &key,
const std::string &defaultValue = "") {
val value = val::global("localStorage").call<val>("getItem", key);
if(value == val::null()) {
return defaultValue;
}
return value.as<std::string>();
}
};
SettingsRef GetSettings() {
return std::make_shared<SettingsImplHtml>();
}
//-----------------------------------------------------------------------------
// Timers
//-----------------------------------------------------------------------------
class TimerImplHtml : public Timer {
public:
static void Callback(void *arg) {
TimerImplHtml *timer = (TimerImplHtml *)arg;
if(timer->onTimeout) {
timer->onTimeout();
}
}
void RunAfter(unsigned milliseconds) override {
emscripten_async_call(TimerImplHtml::Callback, this, milliseconds + 1);
}
void RunAfterNextFrame() override {
emscripten_async_call(TimerImplHtml::Callback, this, 0);
}
void RunAfterProcessingEvents() override {
emscripten_push_uncounted_main_loop_blocker(TimerImplHtml::Callback, this);
}
};
TimerRef CreateTimer() {
return std::unique_ptr<TimerImplHtml>(new TimerImplHtml);
}
//-----------------------------------------------------------------------------
// Menus
//-----------------------------------------------------------------------------
class MenuItemImplHtml : public MenuItem {
public:
val htmlMenuItem;
MenuItemImplHtml() :
htmlMenuItem(val::global("document").call<val>("createElement", val("li")))
{}
void SetAccelerator(KeyboardEvent accel) override {
val htmlAccel = htmlMenuItem.call<val>("querySelector", val(".accel"));
if(htmlAccel.as<bool>()) {
htmlAccel.call<void>("remove");
}
htmlAccel = val::global("document").call<val>("createElement", val("span"));
htmlAccel.call<void>("setAttribute", val("class"), val("accel"));
htmlAccel.set("innerText", AcceleratorDescription(accel));
htmlMenuItem.call<void>("appendChild", htmlAccel);
}
void SetIndicator(Indicator type) override {
val htmlClasses = htmlMenuItem["classList"];
htmlClasses.call<void>("remove", val("check"));
htmlClasses.call<void>("remove", val("radio"));
switch(type) {
case Indicator::NONE:
break;
case Indicator::CHECK_MARK:
htmlClasses.call<void>("add", val("check"));
break;
case Indicator::RADIO_MARK:
htmlClasses.call<void>("add", val("radio"));
break;
}
}
void SetEnabled(bool enabled) override {
if(enabled) {
htmlMenuItem["classList"].call<void>("remove", val("disabled"));
} else {
htmlMenuItem["classList"].call<void>("add", val("disabled"));
}
}
void SetActive(bool active) override {
if(active) {
htmlMenuItem["classList"].call<void>("add", val("active"));
} else {
htmlMenuItem["classList"].call<void>("remove", val("active"));
}
}
};
class MenuImplHtml;
static std::shared_ptr<MenuImplHtml> popupMenuOnScreen;
class MenuImplHtml : public Menu,
public std::enable_shared_from_this<MenuImplHtml> {
public:
val htmlMenu;
std::vector<std::shared_ptr<MenuItemImplHtml>> menuItems;
std::vector<std::shared_ptr<MenuImplHtml>> subMenus;
std::function<void()> popupDismissFunc;
MenuImplHtml() :
htmlMenu(val::global("document").call<val>("createElement", val("ul")))
{
htmlMenu["classList"].call<void>("add", val("menu"));
htmlMenu.call<void>("setAttribute", val("oncontextmenu"), val("return false"));
}
MenuItemRef AddItem(const std::string &label, std::function<void()> onTrigger,
bool mnemonics = true) override {
std::shared_ptr<MenuItemImplHtml> menuItem = std::make_shared<MenuItemImplHtml>();
menuItems.push_back(menuItem);
menuItem->onTrigger = onTrigger;
if(mnemonics) {
val::global("window").call<void>("setLabelWithMnemonic", menuItem->htmlMenuItem,
label);
} else {
val htmlLabel = val::global("document").call<val>("createElement", val("span"));
htmlLabel["classList"].call<void>("add", val("label"));
htmlLabel.set("innerText", label);
menuItem->htmlMenuItem.call<void>("appendChild", htmlLabel);
}
RegisterEventListener(menuItem->htmlMenuItem, "trigger", [menuItem]() {
if(menuItem->onTrigger) {
menuItem->onTrigger();
}
});
htmlMenu.call<void>("appendChild", menuItem->htmlMenuItem);
return menuItem;
}
std::shared_ptr<Menu> AddSubMenu(const std::string &label) override {
val htmlMenuItem = val::global("document").call<val>("createElement", val("li"));
val::global("window").call<void>("setLabelWithMnemonic", htmlMenuItem, label);
htmlMenuItem["classList"].call<void>("add", val("has-submenu"));
htmlMenu.call<void>("appendChild", htmlMenuItem);
std::shared_ptr<MenuImplHtml> subMenu = std::make_shared<MenuImplHtml>();
subMenus.push_back(subMenu);
htmlMenuItem.call<void>("appendChild", subMenu->htmlMenu);
return subMenu;
}
void AddSeparator() override {
val htmlSeparator = val::global("document").call<val>("createElement", val("li"));
htmlSeparator["classList"].call<void>("add", val("separator"));
htmlMenu.call<void>("appendChild", htmlSeparator);
}
void PopUp() override {
if(popupMenuOnScreen) {
popupMenuOnScreen->htmlMenu.call<void>("remove");
popupMenuOnScreen = NULL;
}
EmscriptenMouseEvent emStatus = {};
sscheck(emscripten_get_mouse_status(&emStatus));
htmlMenu["classList"].call<void>("add", val("popup"));
htmlMenu["style"].set("left", std::to_string(emStatus.clientX) + "px");
htmlMenu["style"].set("top", std::to_string(emStatus.clientY) + "px");
val::global("document")["body"].call<void>("appendChild", htmlMenu);
popupMenuOnScreen = shared_from_this();
}
void Clear() override {
while(htmlMenu["childElementCount"].as<int>() > 0) {
htmlMenu["firstChild"].call<void>("remove");
}
}
};
MenuRef CreateMenu() {
return std::make_shared<MenuImplHtml>();
}
class MenuBarImplHtml final : public MenuBar {
public:
val htmlMenuBar;
std::vector<std::shared_ptr<MenuImplHtml>> subMenus;
MenuBarImplHtml() :
htmlMenuBar(val::global("document").call<val>("createElement", val("ul")))
{
htmlMenuBar["classList"].call<void>("add", val("menu"));
htmlMenuBar["classList"].call<void>("add", val("menubar"));
}
std::shared_ptr<Menu> AddSubMenu(const std::string &label) override {
val htmlMenuItem = val::global("document").call<val>("createElement", val("li"));
val::global("window").call<void>("setLabelWithMnemonic", htmlMenuItem, label);
htmlMenuBar.call<void>("appendChild", htmlMenuItem);
std::shared_ptr<MenuImplHtml> subMenu = std::make_shared<MenuImplHtml>();
subMenus.push_back(subMenu);
htmlMenuItem.call<void>("appendChild", subMenu->htmlMenu);
return subMenu;
}
void Clear() override {
while(htmlMenuBar["childElementCount"].as<int>() > 0) {
htmlMenuBar["firstChild"].call<void>("remove");
}
}
};
MenuBarRef GetOrCreateMainMenu(bool *unique) {
*unique = false;
return std::make_shared<MenuBarImplHtml>();
}
//-----------------------------------------------------------------------------
// Windows
//-----------------------------------------------------------------------------
class TouchEventHelper {
public:
// FIXME(emscripten): Workaround. touchstart and touchend repeats two times.
bool touchActionStarted = false;
int previousNumTouches = 0;
double centerX = 0;
double centerY = 0;
// double startPinchDistance = 0;
double previousPinchDistance = 0;
std::function<void(MouseEvent*, void*)> onPointerDown;
std::function<void(MouseEvent*, void*)> onPointerMove;
std::function<void(MouseEvent*, void*)> onPointerUp;
std::function<void(MouseEvent*, void*)> onScroll;
void clear(void) {
touchActionStarted = false;
previousNumTouches = 0;
centerX = 0;
centerY = 0;
// startPinchDistance = 0;
previousPinchDistance = 0;
}
void calculateCenterPosition(const EmscriptenTouchEvent& emEvent, double& dst_x, double& dst_y) {
double x = 0;
double y = 0;
for (int i = 0; i < emEvent.numTouches; i++) {
x += emEvent.touches[i].targetX;
y += emEvent.touches[i].targetY;
}
dst_x = x / emEvent.numTouches;
dst_y = y / emEvent.numTouches;
}
void calculatePinchDistance(const EmscriptenTouchEvent& emEvent, double& dst_distance) {
if (emEvent.numTouches < 2) {
return;
}
double x1 = emEvent.touches[0].targetX;
double y1 = emEvent.touches[0].targetY;
double x2 = emEvent.touches[1].targetX;
double y2 = emEvent.touches[1].targetY;
dst_distance = std::sqrt(std::pow(x1 - x2, 2) + std::pow(y1 - y2, 2));
}
void createMouseEventPRESS(const EmscriptenTouchEvent& emEvent, MouseEvent& dst_mouseevent) {
double x = 0, y = 0;
this->calculateCenterPosition(emEvent, x, y);
this->centerX = x;
this->centerY = y;
this->touchActionStarted = true;
this->previousNumTouches = emEvent.numTouches;
dst_mouseevent.type = MouseEvent::Type::PRESS;
dst_mouseevent.x = x;
dst_mouseevent.y = y;
dst_mouseevent.shiftDown = emEvent.shiftKey;
dst_mouseevent.controlDown = emEvent.ctrlKey;
switch(emEvent.numTouches) {
case 1:
dst_mouseevent.button = MouseEvent::Button::LEFT;
break;
case 2: {
dst_mouseevent.button = MouseEvent::Button::RIGHT;
// double distance = 0;
this->calculatePinchDistance(emEvent, this->previousPinchDistance);
// this->startPinchDistance = distance;
// this->previousPinchDistance = distance;
break;
}
default:
dst_mouseevent.button = MouseEvent::Button::MIDDLE;
break;
}
}
void createMouseEventRELEASE(const EmscriptenTouchEvent& emEvent, MouseEvent& dst_mouseevent) {
this->calculateCenterPosition(emEvent, this->centerX, this->centerY);
this->previousNumTouches = 0;
dst_mouseevent.type = MouseEvent::Type::RELEASE;
dst_mouseevent.x = this->centerX;
dst_mouseevent.y = this->centerY;
dst_mouseevent.shiftDown = emEvent.shiftKey;
dst_mouseevent.controlDown = emEvent.ctrlKey;
switch(this->previousNumTouches) {
case 1:
dst_mouseevent.button = MouseEvent::Button::LEFT;
break;
case 2:
dst_mouseevent.button = MouseEvent::Button::RIGHT;
break;
default:
dst_mouseevent.button = MouseEvent::Button::MIDDLE;
break;
}
}
void createMouseEventMOTION(const EmscriptenTouchEvent& emEvent, MouseEvent& dst_mouseevent) {
dst_mouseevent.type = MouseEvent::Type::MOTION;
this->calculateCenterPosition(emEvent, this->centerX, this->centerY);
dst_mouseevent.x = this->centerX;
dst_mouseevent.y = this->centerY;
dst_mouseevent.shiftDown = emEvent.shiftKey;
dst_mouseevent.controlDown = emEvent.ctrlKey;
switch(emEvent.numTouches) {
case 1:
dst_mouseevent.button = MouseEvent::Button::LEFT;
break;
case 2:
dst_mouseevent.button = MouseEvent::Button::RIGHT;
break;
default:
dst_mouseevent.button = MouseEvent::Button::MIDDLE;
break;
}
}
void createMouseEventSCROLL(const EmscriptenTouchEvent& emEvent, MouseEvent& event) {
event.type = MouseEvent::Type::SCROLL_VERT;
double newDistance = 0;
this->calculatePinchDistance(emEvent, newDistance);
this->calculateCenterPosition(emEvent, this->centerX, this->centerY);
event.x = this->centerX;
event.y = this->centerY;
event.shiftDown = emEvent.shiftKey;
event.controlDown = emEvent.ctrlKey;
// FIXME(emscripten): best value range for scrollDelta ?
event.scrollDelta = (newDistance - this->previousPinchDistance) / 25.0;
if (std::abs(event.scrollDelta) > 2) {
event.scrollDelta = 2;
if (std::signbit(event.scrollDelta)) {
event.scrollDelta *= -1.0;
}
}
this->previousPinchDistance = newDistance;
}
void onTouchStart(const EmscriptenTouchEvent& emEvent, void* callbackParameter) {
if (this->touchActionStarted) {
// dbp("onTouchStart(): Break due to already started.");
return;
}
MouseEvent event;
this->createMouseEventPRESS(emEvent, event);
this->previousNumTouches = emEvent.numTouches;
if (this->onPointerDown) {
// dbp("onPointerDown(): numTouches=%d, timestamp=%f", emEvent.numTouches, emEvent.timestamp);
this->onPointerDown(&event, callbackParameter);
}
}
void onTouchMove(const EmscriptenTouchEvent& emEvent, void* callbackParameter) {
this->calculateCenterPosition(emEvent, this->centerX, this->centerY);
int newNumTouches = emEvent.numTouches;
if (newNumTouches != this->previousNumTouches) {
MouseEvent releaseEvent;
this->createMouseEventRELEASE(emEvent, releaseEvent);
if (this->onPointerUp) {
// dbp("onPointerUp(): numTouches=%d, timestamp=%f", emEvent.numTouches, emEvent.timestamp);
this->onPointerUp(&releaseEvent, callbackParameter);
}
MouseEvent pressEvent;
this->createMouseEventPRESS(emEvent, pressEvent);
if (this->onPointerDown) {
// dbp("onPointerDown(): numTouches=%d, timestamp=%f", emEvent.numTouches, emEvent.timestamp);
this->onPointerDown(&pressEvent, callbackParameter);
}
}
MouseEvent motionEvent = { };
this->createMouseEventMOTION(emEvent, motionEvent);
if (this->onPointerMove) {
// dbp("onPointerMove(): numTouches=%d, timestamp=%f", emEvent.numTouches, emEvent.timestamp);
this->onPointerMove(&motionEvent, callbackParameter);
}
if (emEvent.numTouches == 2) {
MouseEvent scrollEvent;
this->createMouseEventSCROLL(emEvent, scrollEvent);
if (scrollEvent.scrollDelta != 0) {
if (this->onScroll) {
// dbp("Scroll %f", scrollEvent.scrollDelta);
this->onScroll(&scrollEvent, callbackParameter);
}
}
}
this->previousNumTouches = emEvent.numTouches;
}
void onTouchEnd(const EmscriptenTouchEvent& emEvent, void* callbackParameter) {
if (!this->touchActionStarted) {
return;
}
MouseEvent releaseEvent = { };
this->createMouseEventRELEASE(emEvent, releaseEvent);
if (this->onPointerUp) {
// dbp("onPointerUp(): numTouches=%d, timestamp=%d", emEvent.numTouches, emEvent.timestamp);
this->onPointerUp(&releaseEvent, callbackParameter);
}
this->clear();
}
void onTouchCancel(const EmscriptenTouchEvent& emEvent, void* callbackParameter) {
this->onTouchEnd(emEvent, callbackParameter);
}
};
static TouchEventHelper touchEventHelper;
static KeyboardEvent handledKeyboardEvent;
class WindowImplHtml final : public Window {
public:
std::string emCanvasSel;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE emContext = 0;
val htmlContainer;
val htmlEditor;
val scrollbarHelper;
std::shared_ptr<MenuBarImplHtml> menuBar;
WindowImplHtml(val htmlContainer, std::string emCanvasSel) :
emCanvasSel(emCanvasSel),
htmlContainer(htmlContainer),
htmlEditor(val::global("document").call<val>("createElement", val("input")))
{
htmlEditor["classList"].call<void>("add", val("editor"));
htmlEditor["style"].set("display", "none");
auto editingDoneFunc = [this] {
if(onEditingDone) {
onEditingDone(htmlEditor["value"].as<std::string>());
}
};
RegisterEventListener(htmlEditor, "trigger", editingDoneFunc);
htmlContainer["parentElement"].call<void>("appendChild", htmlEditor);
std::string scrollbarElementQuery = emCanvasSel + "scrollbar";
dbp("scrollbar element query: \"%s\"", scrollbarElementQuery.c_str());
val scrollbarElement = val::global("document").call<val>("querySelector", val(scrollbarElementQuery));
if (scrollbarElement == val::null()) {
// dbp("scrollbar element is null.");
this->scrollbarHelper = val::null();
} else {
dbp("scrollbar element OK.");
this->scrollbarHelper = val::global("window")["ScrollbarHelper"].new_(val(scrollbarElementQuery));
static std::function<void()> onScrollCallback = [this] {
// dbp("onScrollCallback std::function this=%p", (void*)this);
if (this->onScrollbarAdjusted) {
double newpos = this->scrollbarHelper.call<double>("getScrollbarPosition");
// dbp(" call onScrollbarAdjusted(%f)", newpos);
this->onScrollbarAdjusted(newpos);
}
this->Invalidate();
};
this->scrollbarHelper.set("onScrollCallback", Wrap(onScrollCallback));
}
sscheck(emscripten_set_resize_callback(
EMSCRIPTEN_EVENT_TARGET_WINDOW, this, /*useCapture=*/false,
WindowImplHtml::ResizeCallback));
sscheck(emscripten_set_resize_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::ResizeCallback));
sscheck(emscripten_set_mousemove_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_mousedown_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_click_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_dblclick_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_mouseup_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_mouseleave_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::MouseCallback));
sscheck(emscripten_set_touchstart_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::TouchCallback));
sscheck(emscripten_set_touchmove_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::TouchCallback));
sscheck(emscripten_set_touchend_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::TouchCallback));
sscheck(emscripten_set_touchcancel_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::TouchCallback));
sscheck(emscripten_set_wheel_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::WheelCallback));
sscheck(emscripten_set_keydown_callback(
EMSCRIPTEN_EVENT_TARGET_WINDOW, this, /*useCapture=*/false,
WindowImplHtml::KeyboardCallback));
sscheck(emscripten_set_keyup_callback(
EMSCRIPTEN_EVENT_TARGET_WINDOW, this, /*useCapture=*/false,
WindowImplHtml::KeyboardCallback));
sscheck(emscripten_set_webglcontextlost_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::ContextLostCallback));
sscheck(emscripten_set_webglcontextrestored_callback(
emCanvasSel.c_str(), this, /*useCapture=*/false,
WindowImplHtml::ContextRestoredCallback));
ResizeCanvasElement();
SetupWebGLContext();
}
~WindowImplHtml() {
if(emContext != 0) {
sscheck(emscripten_webgl_destroy_context(emContext));
}
}
static EM_BOOL ResizeCallback(int emEventType, const EmscriptenUiEvent *emEvent, void *data) {
WindowImplHtml *window = (WindowImplHtml *)data;
window->Invalidate();
return EM_TRUE;
}
static EM_BOOL MouseCallback(int emEventType, const EmscriptenMouseEvent *emEvent,
void *data) {
if(val::global("window").call<bool>("isModal")) return EM_FALSE;
WindowImplHtml *window = (WindowImplHtml *)data;
MouseEvent event = {};
switch(emEventType) {
case EMSCRIPTEN_EVENT_MOUSEMOVE:
event.type = MouseEvent::Type::MOTION;
break;
case EMSCRIPTEN_EVENT_MOUSEDOWN:
event.type = MouseEvent::Type::PRESS;
break;
case EMSCRIPTEN_EVENT_DBLCLICK:
event.type = MouseEvent::Type::DBL_PRESS;
break;
case EMSCRIPTEN_EVENT_MOUSEUP:
event.type = MouseEvent::Type::RELEASE;
break;
case EMSCRIPTEN_EVENT_MOUSELEAVE:
event.type = MouseEvent::Type::LEAVE;
break;
default:
return EM_FALSE;
}
switch(emEventType) {
case EMSCRIPTEN_EVENT_MOUSEMOVE:
if(emEvent->buttons & 1) {
event.button = MouseEvent::Button::LEFT;
} else if(emEvent->buttons & 2) {
event.button = MouseEvent::Button::RIGHT;
} else if(emEvent->buttons & 4) {
event.button = MouseEvent::Button::MIDDLE;
}
break;
case EMSCRIPTEN_EVENT_MOUSEDOWN:
case EMSCRIPTEN_EVENT_DBLCLICK:
case EMSCRIPTEN_EVENT_MOUSEUP:
switch(emEvent->button) {
case 0: event.button = MouseEvent::Button::LEFT; break;
case 1: event.button = MouseEvent::Button::MIDDLE; break;
case 2: event.button = MouseEvent::Button::RIGHT; break;
}
break;
default:
return EM_FALSE;
}
event.x = emEvent->targetX;
event.y = emEvent->targetY;
event.shiftDown = emEvent->shiftKey || emEvent->altKey;
event.controlDown = emEvent->ctrlKey;
if(window->onMouseEvent) {
return window->onMouseEvent(event);
}
return EM_FALSE;
}
static EM_BOOL TouchCallback(int emEventType, const EmscriptenTouchEvent *emEvent,
void *data) {
if(val::global("window").call<bool>("isModal")) return EM_FALSE;
static bool initialized = false;
WindowImplHtml *window = (WindowImplHtml *)data;
if (!initialized) {
touchEventHelper.onPointerDown = [](MouseEvent* event, void* param) -> void {
WindowImplHtml* window = (WindowImplHtml*)param;
if (window->onMouseEvent) {
window->onMouseEvent(*event);
}
};
touchEventHelper.onPointerMove = [](MouseEvent* event, void* param) -> void {
WindowImplHtml* window = (WindowImplHtml*)param;
if (window->onMouseEvent) {
window->onMouseEvent(*event);
}
};
touchEventHelper.onPointerUp = [](MouseEvent* event, void* param) -> void {
WindowImplHtml* window = (WindowImplHtml*)param;
if (window->onMouseEvent) {
window->onMouseEvent(*event);
}
};
touchEventHelper.onScroll = [](MouseEvent* event, void* param) -> void {
WindowImplHtml* window = (WindowImplHtml*)param;
if (window->onMouseEvent) {
window->onMouseEvent(*event);
}
};
initialized = true;
}
switch(emEventType) {
case EMSCRIPTEN_EVENT_TOUCHSTART:
touchEventHelper.onTouchStart(*emEvent, window);
break;
case EMSCRIPTEN_EVENT_TOUCHMOVE:
touchEventHelper.onTouchMove(*emEvent, window);
break;
case EMSCRIPTEN_EVENT_TOUCHEND:
touchEventHelper.onTouchEnd(*emEvent, window);
break;
case EMSCRIPTEN_EVENT_TOUCHCANCEL:
touchEventHelper.onTouchCancel(*emEvent, window);
break;
default:
return EM_FALSE;
}
return true;
}
static EM_BOOL WheelCallback(int emEventType, const EmscriptenWheelEvent *emEvent,
void *data) {
if(val::global("window").call<bool>("isModal")) return EM_FALSE;
WindowImplHtml *window = (WindowImplHtml *)data;
MouseEvent event = {};
if(emEvent->deltaY != 0) {
event.type = MouseEvent::Type::SCROLL_VERT;
// FIXME(emscripten):
// Pay attention to:
// dbp("Mouse wheel delta mode: %lu", emEvent->deltaMode);
// https://emscripten.org/docs/api_reference/html5.h.html#id11
// https://www.w3.org/TR/DOM-Level-3-Events/#dom-wheelevent-deltamode
// and adjust the 0.01 below. deltaMode == 0 on a Firefox on a Windows.
event.scrollDelta = -emEvent->deltaY * 0.01;
} else {
return EM_FALSE;
}
const EmscriptenMouseEvent &emStatus = emEvent->mouse;
event.x = emStatus.targetX;
event.y = emStatus.targetY;
event.shiftDown = emStatus.shiftKey;
event.controlDown = emStatus.ctrlKey;
if(window->onMouseEvent) {
return window->onMouseEvent(event);
}
return EM_FALSE;
}
static EM_BOOL KeyboardCallback(int emEventType, const EmscriptenKeyboardEvent *emEvent,
void *data) {
if(emEvent->altKey) return EM_FALSE;
if(emEvent->repeat) return EM_FALSE;
// Pass Ctrl-= through to the browser (for font size increase), symmetric with
// Ctrl-minus which is already passed through since it doesn't match any shortcut.
if(emEvent->ctrlKey && strcmp(emEvent->key, "=") == 0) return EM_FALSE;
WindowImplHtml *window = (WindowImplHtml *)data;
KeyboardEvent event = {};
switch(emEventType) {
case EMSCRIPTEN_EVENT_KEYDOWN:
event.type = KeyboardEvent::Type::PRESS;
break;
case EMSCRIPTEN_EVENT_KEYUP:
event.type = KeyboardEvent::Type::RELEASE;
break;
default:
return EM_FALSE;
}
event.shiftDown = emEvent->shiftKey;
event.controlDown = emEvent->ctrlKey;
std::string key = emEvent->key;
if(key[0] == 'F' && isdigit(key[1])) {
event.key = KeyboardEvent::Key::FUNCTION;
event.num = std::stol(key.substr(1));
} else {
event.key = KeyboardEvent::Key::CHARACTER;
auto utf8 = ReadUTF8(key);
if(++utf8.begin() == utf8.end()) {
event.chr = tolower(*utf8.begin());
} else if(key == "Escape") {
event.chr = '\e';
} else if(key == "Tab") {
event.chr = '\t';
} else if(key == "Backspace") {
event.chr = '\b';
} else if(key == "Delete") {
event.chr = '\x7f';
} else {
return EM_FALSE;
}
if(event.chr == '>' && event.shiftDown) {
event.shiftDown = false;
}
}
if(event.Equals(handledKeyboardEvent)) return EM_FALSE;
if(val::global("window").call<bool>("isModal")) {
handledKeyboardEvent = {};
return EM_FALSE;
}
if(window->onKeyboardEvent) {
if(window->onKeyboardEvent(event)) {
handledKeyboardEvent = event;
return EM_TRUE;
}
}
return EM_FALSE;
}
void SetupWebGLContext() {
EmscriptenWebGLContextAttributes emAttribs = {};
emscripten_webgl_init_context_attributes(&emAttribs);
emAttribs.alpha = false;
emAttribs.failIfMajorPerformanceCaveat = true;
sscheck(emContext = emscripten_webgl_create_context(emCanvasSel.c_str(), &emAttribs));
dbp("Canvas %s: got context %d", emCanvasSel.c_str(), emContext);
}
static bool ContextLostCallback(int eventType, const void *reserved, void *data) {
WindowImplHtml *window = (WindowImplHtml *)data;
dbp("Canvas %s: context lost", window->emCanvasSel.c_str());
window->emContext = 0;
if(window->onContextLost) {
window->onContextLost();
}
return EM_TRUE;
}
static bool ContextRestoredCallback(int eventType, const void *reserved, void *data) {
WindowImplHtml *window = (WindowImplHtml *)data;
dbp("Canvas %s: context restored", window->emCanvasSel.c_str());
window->SetupWebGLContext();
return EM_TRUE;
}
void ResizeCanvasElement() {
double width, height;
std::string htmlContainerSel = "#" + htmlContainer["id"].as<std::string>();
sscheck(emscripten_get_element_css_size(htmlContainerSel.c_str(), &width, &height));
// sscheck(emscripten_get_element_css_size(emCanvasSel.c_str(), &width, &height));
double devicePixelRatio = GetDevicePixelRatio();
width *= devicePixelRatio;
height *= devicePixelRatio;
int currentWidth = 0, currentHeight = 0;
sscheck(emscripten_get_canvas_element_size(emCanvasSel.c_str(), ¤tWidth, ¤tHeight));
if ((int)width != currentWidth || (int)height != currentHeight) {
// dbp("Canvas %s container current size: (%d, %d)", emCanvasSel.c_str(), (int)currentWidth, (int)currentHeight);
// dbp("Canvas %s: resizing to (%d, %d)", emCanvasSel.c_str(), (int)width, (int)height);
sscheck(emscripten_set_canvas_element_size(emCanvasSel.c_str(), (int)width, (int)height));
}
}
static void RenderCallback(void *data) {
WindowImplHtml *window = (WindowImplHtml *)data;
if(window->emContext == 0) {
dbp("Canvas %s: cannot render: no context", window->emCanvasSel.c_str());
return;
}
window->ResizeCanvasElement();
sscheck(emscripten_webgl_make_context_current(window->emContext));
if(window->onRender) {
window->onRender();
}
}
double GetPixelDensity() override {
return 96.0 * GetDevicePixelRatio();
}
double GetDevicePixelRatio() override {
return emscripten_get_device_pixel_ratio();
}
bool IsVisible() override {
// FIXME(emscripten): implement
return true;
}
void SetVisible(bool visible) override {
// FIXME(emscripten): implement
}
void Focus() override {
// Do nothing, we can't affect focus of browser windows.
}
bool IsFullScreen() override {
EmscriptenFullscreenChangeEvent emEvent = {};
sscheck(emscripten_get_fullscreen_status(&emEvent));
return emEvent.isFullscreen;
}
void SetFullScreen(bool fullScreen) override {
if(fullScreen) {
EmscriptenFullscreenStrategy emStrategy = {};
emStrategy.scaleMode = EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH;
emStrategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
emStrategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
sscheck(emscripten_request_fullscreen_strategy(
emCanvasSel.c_str(), /*deferUntilInEventHandler=*/true, &emStrategy));
} else {
sscheck(emscripten_exit_fullscreen());
}
}
void SetTitle(const std::string &title) override {