Method _mouse_wheel_callback

platform/web/display_server_web.cpp:650–722

}

int DisplayServerWeb::_mouse_wheel_callback(int p_delta_mode, double p_delta_x, double p_delta_y) {
	if (!godot_js_display_canvas_is_focused() && !godot_js_is_ime_focused()) {
		if (get_singleton()->cursor_inside_canvas) {
			godot_js_display_canvas_focus();
		} else {
			return false;
		}
	}

	Input *input = Input::get_singleton();
	Ref<InputEventMouseButton> ev;
	ev.instantiate();
	ev->set_position(input->get_mouse_position());
	ev->set_global_position(ev->get_position());

	ev->set_shift_pressed(input->is_key_pressed(Key::SHIFT));
	ev->set_alt_pressed(input->is_key_pressed(Key::ALT));
	ev->set_ctrl_pressed(input->is_key_pressed(Key::CTRL));
	ev->set_meta_pressed(input->is_key_pressed(Key::META));

	enum DeltaMode {
		DELTA_MODE_PIXEL = 0,
		DELTA_MODE_LINE = 1,
		DELTA_MODE_PAGE = 2,
	};
	const float MOUSE_WHEEL_PIXEL_FACTOR = 0.03f;
	const float MOUSE_WHEEL_LINE_FACTOR = 0.3f;
	const float MOUSE_WHEEL_PAGE_FACTOR = 1.0f;
	float mouse_wheel_factor;

	switch (p_delta_mode) {
		case DELTA_MODE_PIXEL: {
			mouse_wheel_factor = MOUSE_WHEEL_PIXEL_FACTOR;
		} break;
		case DELTA_MODE_LINE: {
			mouse_wheel_factor = MOUSE_WHEEL_LINE_FACTOR;
		} break;
		case DELTA_MODE_PAGE: {
			mouse_wheel_factor = MOUSE_WHEEL_PAGE_FACTOR;
		} break;
	}

	if (p_delta_y < 0) {
		ev->set_button_index(MouseButton::WHEEL_UP);
		ev->set_factor(-p_delta_y * mouse_wheel_factor);
	} else if (p_delta_y > 0) {
		ev->set_button_index(MouseButton::WHEEL_DOWN);
		ev->set_factor(p_delta_y * mouse_wheel_factor);
	} else if (p_delta_x > 0) {
		ev->set_button_index(MouseButton::WHEEL_LEFT);
		ev->set_factor(p_delta_x * mouse_wheel_factor);
	} else if (p_delta_x < 0) {
		ev->set_button_index(MouseButton::WHEEL_RIGHT);
		ev->set_factor(-p_delta_x * mouse_wheel_factor);
	} else {
		return false;
	}