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105 lines
4.5 KiB
105 lines
4.5 KiB
/*
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Copyright (c) 2003 Lubos Lunak <l.lunak@kde.org>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef KXERRORHANDLER_H
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#define KXERRORHANDLER_H
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#include <tqvaluelist.h>
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#include <tqwindowdefs.h>
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#include <tdelibs_export.h>
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#include <X11/Xlib.h>
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/**
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* This class simplifies handling of X errors. It shouldn't be necessary to use
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* with Qt classes, as the toolkit should handle X errors itself, so this
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* class will be mainly used with direct Xlib usage, and some lowlevel classes
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* like NETWinInfo.
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*
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* The usual usage is to create a KXErrorHandler instance right before starting
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* operations that might cause X errors, and checking if there was an error
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* by calling error() after the operations are finished. The handlers
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* may be nested, but must be destroyed in reverse order they were created.
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*
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* There's no need to do X sync before creating an instance, every instance
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* will handle only errors for request issued after the instance was created.
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* Errors for older requests will be passed to previous error handler.
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* When checking for error by calling error() at the end, it is necessary
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* to sync with X, to catch all errors that were caused by requests issued
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* before the call to error(). This can be done by passing true to error()
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* to cause explicit XSync(), however, if the last X request needed a roundtrip
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* (e.g. XGetWindowAttributes(), XGetGeometry(), etc.), it is not required
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* to do an explicit sync.
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*
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* @author Lubos Lunak <l.lunak@kde.org>
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* @short Handler for X errors
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*/
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class TDECORE_EXPORT KXErrorHandler
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{
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public:
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/**
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* Creates error handler that will set error flag after encountering
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* any X error.
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*/
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KXErrorHandler( Display* dpy = tqt_xdisplay());
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/**
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* This constructor takes pointer to a function that will get request number,
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* error code number and resource id of the failed request, as provided
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* by XErrorEvent. If the function returns true, the error flag will be set.
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*/
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KXErrorHandler( bool (*handler)( int request, int error_code, unsigned long resource_id ), Display* dpy = tqt_xdisplay());
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/**
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* This constructor takes pointer to a function whose prototype matches
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* the one that's used with the XSetErrorHandler() Xlib function.
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* NOTE: For the error flag to be set, the function must return non-zero
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* value.
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*/
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KXErrorHandler( int (*handler)( Display*, XErrorEvent* ), Display* dpy = tqt_xdisplay());
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/**
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* This function returns true if the error flag is set (i.e. no custom handler
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* function was used and there was any error, or the custom handler indicated
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* an error by its return value).
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*
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* @param sync if true, and explicit XSync() will be done. Not necessary
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* when the last X request required a roundtrip.
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*/
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bool error( bool sync ) const;
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~KXErrorHandler();
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private:
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void addHandler();
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int handle( Display* dpy, XErrorEvent* e );
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bool (*user_handler1)( int request, int error_code, unsigned long resource_id );
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int (*user_handler2)( Display*, XErrorEvent* );
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int (*old_handler)( Display*, XErrorEvent* );
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unsigned long first_request;
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Display* display;
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bool was_error;
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static int handler_wrapper( Display*, XErrorEvent* );
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static KXErrorHandler** handlers;
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static int pos;
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static int size;
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class KXErrorHandlerPrivate* d;
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};
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#endif
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