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72 lines
2.2 KiB
72 lines
2.2 KiB
#ifndef _CWNDPROC_H_
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#define _CWNDPROC_H_
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// CImpWndProc
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//
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// Use this class when you want to associate a window with
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// an object using a virtual wndproc.
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//
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// NOTE: The window's lifetime must be encompassed by the object.
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// I.E. NO REFCOUNT IS HELD ON THE OBJECT!
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//
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// Messages after WM_NCCREATE up to and including WM_DESTROY
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// are forwarded to v_WndProc.
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//
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// _hwnd is non-NULL from WM_NCCREATE up to but not during WM_DESTROY.
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// (Not during because the final release may be tied to WM_DESTROY
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// so we cannot reference member variables after forwarding thie message.)
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//
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class CImpWndProc
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{
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public:
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virtual ULONG __stdcall AddRef() = 0;
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virtual ULONG __stdcall Release() = 0;
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protected:
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virtual LRESULT v_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) PURE;
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static LRESULT CALLBACK s_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
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HWND _hwnd;
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} ;
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// CNotifySubclassWndProc
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//
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// This class subclasses an HWND, registers for SHChangeNotify events,
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// and forwards them to the inheritor's IShellChangeNotify implementation.
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//
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// You need one instance of this class per window you want to subclass
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// and register for events against. (So if you need >1 window hooked up
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// in this matter, you need to have member implementations that inherit
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// from this class.)
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//
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class CNotifySubclassWndProc
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{
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public:
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virtual STDMETHODIMP OnChange(LONG lEvent, LPCITEMIDLIST pidl1, LPCITEMIDLIST pidl2) PURE;
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protected:
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BOOL _SubclassWindow(HWND hwnd);
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void _UnsubclassWindow(HWND hwnd);
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void _RegisterWindow(HWND hwnd, LPCITEMIDLIST pidl, long lEvents,
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UINT uFlags = (SHCNRF_ShellLevel | SHCNRF_InterruptLevel));
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void _UnregisterWindow(HWND hwnd);
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virtual LRESULT _DefWindowProc(HWND hwnd, UINT uMessage, WPARAM wParam, LPARAM lParam);
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void _FlushNotifyMessages(HWND hwnd);
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private:
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static LRESULT CALLBACK _SubclassWndProc(
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HWND hwnd, UINT uMessage,
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WPARAM wParam, LPARAM lParam,
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UINT_PTR uIdSubclass, DWORD_PTR dwRefData);
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UINT _uRegister; // SHChangeNotify id
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#ifdef DEBUG
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HWND _hwndSubclassed;
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#endif
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} ;
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#endif _CWNDPROC_H_
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