Mercurial > dwindows
diff dw.hpp @ 2867:ada74f4d3f39
C++: Implement conditional signal handlers based on overrides.
This uses templates in a sort of hacky way to determine if our virtual
functions have been overridden. Leaving some debug code in for the moment
to make sure it works on all platforms. OS/2 will require using GCC for the
C++ bindings, since VisualAge only supports C++99 and Watcom doesn't even
support that as far as I know.
| author | bsmith@81767d24-ef19-dc11-ae90-00e081727c95 |
|---|---|
| date | Sat, 17 Dec 2022 21:39:00 +0000 |
| parents | 6ea67d0809eb |
| children | 5ee1aaa48fc7 |
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--- a/dw.hpp Sat Dec 17 11:51:22 2022 +0000 +++ b/dw.hpp Sat Dec 17 21:39:00 2022 +0000 @@ -1,5 +1,6 @@ /* Dynamic Windows C++ Language Bindings * Copyright 2022 Brian Smith + * Requires a C++11 compatible compiler. */ #ifndef _HPP_DW @@ -35,11 +36,20 @@ }; // Top-level window class is packable +template <class Derived> class Window : public Box { private: - void Setup() { dw_signal_connect(hwnd, DW_SIGNAL_DELETE, DW_SIGNAL_FUNC(_OnDelete), this); - dw_signal_connect(hwnd, DW_SIGNAL_CONFIGURE, DW_SIGNAL_FUNC(_OnConfigure), this); } + void Setup() { + if(&Derived::OnDelete != &Window::OnDelete) { + dw_signal_connect(hwnd, DW_SIGNAL_DELETE, DW_SIGNAL_FUNC(_OnDelete), this); + dw_debug("DW_SIGNAL_DELETE\n"); + } + if(&Derived::OnConfigure != &Window::OnConfigure) { + dw_signal_connect(hwnd, DW_SIGNAL_CONFIGURE, DW_SIGNAL_FUNC(_OnConfigure), this); + dw_debug("DW_SIGNAL_CONFIGURE\n"); + } + } static int _OnDelete(HWND window, void *data) { return reinterpret_cast<Window *>(data)->OnDelete(); } static int _OnConfigure(HWND window, int width, int height, void *data) { return reinterpret_cast<Window *>(data)->OnConfigure(width, height); } public: @@ -54,9 +64,9 @@ void SetText(const char *text) { dw_window_set_text(hwnd, text); } void SetSize(unsigned long width, unsigned long height) { dw_window_set_size(hwnd, width, height); } void Show() { dw_window_show(hwnd); } -protected: - virtual int OnDelete() = 0; - virtual int OnConfigure(int width, int height) = 0; + // Our signal handler functions to be overriden + virtual int OnDelete() { return FALSE; } + virtual int OnConfigure(int width, int height) { return FALSE; }; }; class App