108 lines
2.4 KiB
C++
108 lines
2.4 KiB
C++
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// Copyright (c) 2000 Microsoft Corporation
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//
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// windows control subclassing wrapper
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//
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// 22 Nov 2000 sburns
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#ifndef CONTROLSUBCLASSER_HPP_INCLUDED
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#define CONTROLSUBCLASSER_HPP_INCLUDED
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// Class for hooking the window proc of a control.
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class ControlSubclasser
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{
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protected:
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ControlSubclasser();
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// reverses the subclassing by calling UnhookWindowProc.
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virtual
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~ControlSubclasser();
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// Hooks the window proc of the supplied window so that all future messages
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// are routed to the OnMessage method. The OnInit of the parent dialog
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// where the control resides is a good place to call this method.
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//
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// The hook requires that that the GWLP_USERDATA portion of the window
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// be overwritten with the this pointer to this instance. If you need
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// that data, then you could derive a class from this one, and add
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// members for your extra data.
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//
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// Your overrided Init method must call this base method.
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//
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// control - in, handle to the control to be hooked.
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virtual
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HRESULT
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Init(HWND editControl);
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// Invoked upon receipt of any window message. The default implementation
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// calls the control's original window procedure. When you derive a new
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// class from this one, be sure to call this base class method from your
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// derived method for any messages your derived method doesn't handle.
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//
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// message - in, the message code passed to the dialog window.
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//
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// wparam - in, the WPARAM parameter accompanying the message.
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//
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// lparam - in, the LPARAM parameter accompanying the message.
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virtual
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LRESULT
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OnMessage(
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UINT message,
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WPARAM wparam,
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LPARAM lparam);
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// the handle to the subclassed control. Only valid after Init has
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// been called.
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HWND hwnd;
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private:
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// restore the original window proc to the window
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void
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UnhookWindowProc();
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// a static Windows Proc that acts as a dispatcher to the non-static
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// OnMessage method.
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static
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LRESULT CALLBACK
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WindowProc(
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HWND window,
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UINT message,
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WPARAM wParam,
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LPARAM lParam);
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// not implemented: no copying allowed
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ControlSubclasser(const ControlSubclasser&);
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const ControlSubclasser& operator=(const ControlSubclasser&);
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WNDPROC originalWindowProc;
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};
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#endif // CONTROLSUBCLASSER_HPP_INCLUDED
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