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POC++ Function Pointers using class T
 

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    <p>I am working on my own GUI framework using C++ and OpenGL. My experience in both is small as this is my first project using them.</p> <p>In the framework I have created a window, which renders the design of the window, and then any objects that have been added to the window as a child.</p> <p>I then create the window using a new class called MainMenu that inherits from my window class, I then add a new button to the MainMenu</p> <p>Using:</p> <pre><code>button-&gt;SetOnClick(&amp;MainMenu::button_Click, this); </code></pre> <p>I then add a pointer to the function, as well as the instance of the class to the buttons 'SetOnClick' method - Therefore if that button is clicked a method within the MainMenu will run.</p> <p>This works great at the moment, however my issue now is that I want to add a new window called Settings, which will also inherit from the Window class</p> <p>Therefore I need to make the function pointer in my button class work for any number of classes (all of type Window)</p> <p>Here is the code that is currently working - but for only the MainMenu (Please note that I have stripped out a lot of methods that do not relate to the question to make it easier to read)</p> <p>Window.h:</p> <pre><code>class Window { private: void Initialize(WindowManager* manager, int width, int height); public: Window(WindowManager* manager); Window(WindowManager* manager, int width, int height); ~Window(void); void Render(); bool MouseMove(int x, int y); bool MouseLBDown(int x, int y); Children* Child() { return m_children; }; </code></pre> <p>MainMenu.h:</p> <pre><code>class MainMenu : public ObjWindow { private: void Initialize(); public: MainMenu(WindowManager* manager, int width, int height) : Window(manager, width, height) { Initialize(); }; MainMenu(WindowManager* manager) : Window(manager) { Initialize(); }; ~MainMenu(void); void button_Click(); </code></pre> <p>MainMenu.cpp:</p> <pre><code>void MainMenu::Initialize() { Button* button = new Button(Vector2D(100, -400), 100, 50); Child()-&gt;Add(button); button-&gt;SetText("Click Me!"); button-&gt;SetOnClick(&amp;MainMenu::button_Click, this); } void MainMenu::button_Click() { //Do some button code } </code></pre> <p>Button.h:</p> <pre><code>class Button { typedef void (MainMenu::*Function)(); Function m_onClickFunction; MainMenu* m_window; public: Button(Vector2D position, int width, int height); ~Button(void); void SetText(std::string); std::string GetText(); void Render(); bool MouseMove(int x, int y); bool MouseLBDown(int x, int y); void SetOnClick(Function, MainMenu*); </code></pre> <p>Button.cpp:</p> <pre><code>Button::Button(Vector2D position, int width, int height) { m_onClickFunction = NULL; } Button::~Button(void) { } bool Button::MouseMove(int x, int y) { return true; } bool Button::MouseLBDown(int x, int y) { if (m_body-&gt;Intercepts(x,y)) { if (m_onClickFunction != NULL) { (m_window-&gt;*m_onClickFunction)(); } } return true; } void Button::SetOnClick(Function function, MainMenu* window) { m_onClickFunction = function; m_window = window; } </code></pre> <p>From researching around the internet it seems that I need to use a template so that I can handle the class as a type, I have tried fitting this in to my code, but so far I nothing has worked.</p> <p>Please note that I am also new to asking question on stackoverflow, so if I am missing anything important please let me know</p>
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    1. CO@downvoters please remember to explain your downvote, this is super helpful for new people to get their posts as close to question guidelines as possible
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    2. CO@Shane.C - I didn't downvote this, but it's not actually a question. Ben - what *specific* question do you have when trying to implement your Settings?
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    3. CO@Shane.C No need/requirement to do so. A standard close vote explanation will be visible to the OP. (And as a side note upvotes are not to 'heal' downvotes. Use them only if you want to express a question was very well formed and useful for SO's intended Q&A fomat!).
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