Addressing issues with PyColor by splitting behavior off into PyLinkedColor

src/PyLinkedColor.cpp

@@ -0,0 +1,144 @@
+#include "PyLinkedColor.h"
+
+PyGetSetDef PyLinkedColor::getsetters[] = {
+    {"r", (getter)PyLinkedColor::get_member, (setter)PyLinkedColor::set_member, "Red component",   (void*)0},
+    {"g", (getter)PyLinkedColor::get_member, (setter)PyLinkedColor::set_member, "Green component", (void*)1},
+    {"b", (getter)PyLinkedColor::get_member, (setter)PyLinkedColor::set_member, "Blue component",  (void*)2},
+    {"a", (getter)PyLinkedColor::get_member, (setter)PyLinkedColor::set_member, "Alpha component", (void*)3},
+    {NULL}
+};
+
+PyLinkedColor::PyLinkedColor(_PyLinkedColorData d)
+{
+    data = d;
+}
+
+PyLinkedColor::PyLinkedColor(sf::Color (*getter)(), void (*setter)(sf::Color), std::weak_ptr<UIDrawable> parent, int index)
+{
+    data.index = index;
+    data.parent = parent;
+    data.setter = setter;
+    data.getter = getter;
+}
+
+PyObject* PyLinkedColor::pyObject()
+{
+    PyObject* obj = PyType_GenericAlloc(&mcrfpydef::PyLinkedColorType, 0);
+    PyLinkedColorObject* self = (PyLinkedColorObject*)obj;
+    self->data = data;
+    return obj;
+}
+
+PyLinkedColor PyLinkedColor::fromPy(PyObject* obj)
+{
+    PyLinkedColorObject* self = (PyLinkedColorObject*)obj;
+    return PyLinkedColor(self->data);
+}
+
+PyLinkedColor PyLinkedColor::fromPy(PyLinkedColorObject* self)
+{
+    return PyLinkedColor(self->data);
+}
+
+void PyLinkedColor::set(sf::Color color)
+{
+    auto ptr = data.parent.lock();
+    if (ptr)
+    {
+        if (data.setter)
+            data.setter(color);
+    }
+}
+
+sf::Color PyLinkedColor::get()
+{
+    auto ptr = data.parent.lock();
+    if (ptr)
+    {
+        if (data.getter)
+            return data.getter();
+    }
+    return sf::Color(0, 0, 0, 0);
+}
+
+bool PyLinkedColor::alive()
+{
+    return !data.parent.lock();
+}
+
+std::string PyLinkedColor::field()
+{
+    switch (data.index)
+    {
+        case 0:
+            return "fill";
+            break;
+        case 1:
+            return "outline";
+            break;
+        case 2:
+            return "background";
+            break;
+        default:
+            return "unknown";
+            break;
+    }
+}
+
+Py_hash_t PyLinkedColor::hash(PyObject* obj)
+{
+    auto self = (PyLinkedColorObject*)obj;
+    Py_hash_t value = 0;
+    auto ptr = self->data.parent.lock();
+    if (ptr)
+    {
+        auto color = PyLinkedColor(self->data);
+        auto c = linkedcolor.get();
+        value += c.r;
+        value << 8; value += c.g; 
+        value << 8; value += c.b; 
+        value << 8; value += c.a;
+    }
+    if (ptr)
+    {
+        //value << (sizeof(*UIDrawable) * 8);
+        value += reinterpret_cast<Py_hash_t>(&ptr);
+    } 
+
+    return value;
+}
+
+PyObject* PyLinkedColor::repr(PyObject* obj)
+{
+    PyLinkedColorObject* self = (PyLinkedColorObject*)obj;
+    std::ostringstream ss;
+    PyLinkedColor color = PyLinkedColor(self->data);
+    sf::Color c = color.get();
+    ss << "<Color (" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ") " << color.mode() << ">";
+
+    std::string repr_str = ss.str();
+    return PyUnicode_DecodeUTF8(repr_str.c_str(), repr_str.size(), "replace");
+}
+
+
+int PyLinkedColor::init(PyLinkedColorObject* self, PyObject* args, PyObject* kwds)
+{
+    // TODO
+    static const char* keywords[] = { "r", "g", "b", "a", nullptr };
+    return 0;
+}
+
+PyObject* PyLinkedColor::pynew(PyTypeObject* type, PyObject* args, PyObject* kwds)
+{
+    return (PyObject*)type->tp_alloc(type, 0);
+}
+
+PyObject* PyLinkedColor::get_member(PyObject* obj, void* closure)
+{
+    return Py_None; // TODO
+}
+
+int PyLinkedColor::set_member(PyObject* obj, PyObject* value, void* closure)
+{
+    return 0; // TODO
+}

src/PyLinkedColor.h

@@ -0,0 +1,58 @@
+#pragma once
+#include "Common.h"
+#include "Python.h"
+
+class PyLinkedColor;
+class UIDrawable; // forward declare for pointer
+
+typedef struct {
+    std::weak_ptr<UIDrawable> parent; // lifetime management: parent must still exist
+    int index; // specific to the parent class, which color is it?
+    sf::Color(*getter)();
+    void(*setter)(sf::Color);
+} _PyLinkedColorData;
+
+typedef struct {
+    PyObject_HEAD
+    _PyLinkedColorData data;
+} PyLinkedColorObject;
+
+class PyLinkedColor
+{
+private:
+    _PyLinkedColorData data;
+    PyColor(_PyColorData); // private constructor / for operations transferring between C++ and Python
+
+public:
+    PyLinkedColor(sf::Color (*)(), void (*)(sf::Color), std::weak_ptr<UIDrawable>, int);
+    void set(sf::Color);  // change target value, behavior determined by the mode
+    sf::Color get();      // retrieve target value, behavior determined by the mode
+    PyObject* pyParent(); // UIDrawable derived parent object or None
+    std::string field();  // interpret the index as a field's name on UIDrawable
+    bool alive();         // true if SELF_OWNED or parent still exists
+    PyObject* pyObject();
+    static PyLinkedColor fromPy(PyObject*);
+    static PyLinkedColor fromPy(PyLinkedColorObject*);
+    static PyObject* repr(PyObject*);
+    static Py_hash_t hash(PyObject*);
+    static int init(PyLinkedColorObject*, PyObject*, PyObject*);
+    static PyObject* pynew(PyTypeObject* type, PyObject* args=NULL, PyObject* kwds=NULL);
+    static PyObject* get_member(PyObject*, void*);
+    static int set_member(PyObject*, PyObject*, void*);
+    static PyGetSetDef getsetters[];
+};
+
+namespace mcrfpydef {
+    static PyTypeObject PyLinkedColorType = {
+        .tp_name = "mcrfpy.LinkedColor",
+        .tp_basicsize = sizeof(PyLinkedColorObject),
+        .tp_itemsize = 0,
+        .tp_repr = PyLinkedColor::repr,
+        .tp_hash = PyLinkedColor::hash,
+        .tp_flags = Py_TPFLAGS_DEFAULT,
+        .tp_doc = PyDoc_STR("SFML Color Object - Linked to UIDrawable Field"),
+        .tp_getset = PyLinkedColor::getsetters,
+        .tp_init = (initproc)PyLinkedColor::init,
+        .tp_new = PyLinkedColor::pynew,
+    };
+}

src/UI.h

@@ -8,6 +8,7 @@
 #include "PyCallable.h"
 #include "PyTexture.h"
 #include "PyColor.h"
+#include "PyLinkedColor.h"
 
 enum PyObjectsEnum : int
 {
@@ -594,33 +595,44 @@ static int PyUIDrawable_set_click(PyUIGridObject* self, PyObject* value, void* c
         }
 
         // TODO: manually calling tp_alloc to create a PyColorObject seems like an antipattern
-        PyTypeObject* colorType = &PyColorType;
+        /*
-        PyObject* pyColor = colorType->tp_alloc(colorType, 0);
+        PyTypeObject* colorType = &PyLinkedColorType;
+        PyObject* pyColor = colorType->tp_alloc(colorLinkedType, 0);
         if (pyColor == NULL)
         {
-            std::cout << "failure to allocate mcrfpy.Color / PyColorType" << std::endl;
+            std::cout << "failure to allocate mcrfpy.LinkedColor / PyLinkedColorType" << std::endl;
             return NULL;
         }
-        PyColorObject* pyColorObj = reinterpret_cast<PyColorObject*>(pyColor);
+        PyColorObject* pyColorObj = reinterpret_cast<PyLinkedColorObject*>(pyColor);
+        */
 
         // fetch correct member data
-        sf::Color color;
+        //sf::Color color;
+        sf::Color (*cgetter)();
+        void (*csetter)(sf::Color);
         if (member_ptr == 0)
         {
-            color = self->data->text.getFillColor();
+            //color = self->data->text.getFillColor();
             //return Py_BuildValue("(iii)", color.r, color.g, color.b);
+            csetter = &self->data->text.setFillColor;
+            cgetter = &self->data->text.getFillColor;
         }
         else if (member_ptr == 1)
         {
-            color = self->data->text.getOutlineColor();
+            //color = self->data->text.getOutlineColor();
             //return Py_BuildValue("(iii)", color.r, color.g, color.b);
+            csetter = &self->data->text.setOutlineColor;
+            cgetter = &self->data->text.getOutlineColor;
         }
 
         // initialize new mcrfpy.Color instance
         //pyColorObj->data = std::make_shared<sf::Color>(color);
-        PyColor::fromPy(pyColorObj).set(color);
+        //PyLinkedColor::fromPy(pyColorObj).set(color);
+        auto linkedcolor = PyLinkedColor(getter, setter, self->data, member_ptr);
+        //linkedcolor.set(color); // don't need to set a linked color!
         
-        return pyColor;
+        //return pyColor;
+        return linkedcolor.pyObject();
     }
 
     static int PyUICaption_set_color_member(PyUICaptionObject* self, PyObject* value, void* closure)
@@ -628,7 +640,7 @@ static int PyUIDrawable_set_click(PyUIGridObject* self, PyObject* value, void* c
         auto member_ptr = reinterpret_cast<long>(closure);
         //TODO: this logic of (PyColor instance OR tuple -> sf::color) should be encapsulated for reuse
         int r, g, b, a;
-        if (PyObject_IsInstance(value, (PyObject*)&PyColorType))
+        if (PyObject_IsInstance(value, (PyObject*)&PyLinkedColorType))
         {
             // get value from mcrfpy.Color instance
             /*
@@ -638,7 +650,7 @@ static int PyUIDrawable_set_click(PyUIGridObject* self, PyObject* value, void* c
             b = color->data->b;
             a = color->data->a;
             */
-            sf::Color c = PyColor::fromPy(value).get();
+            sf::Color c = PyLinkedColor::fromPy(value).get();
             r = c.r; g = c.g; b = c.b; a = c.a;
         }
         else if (!PyTuple_Check(value) || PyTuple_Size(value) < 3 || PyTuple_Size(value) > 4)