1\section{wxTipProvider overview}\label{tipsoverview} 2 3Many "modern" Windows programs have a feature (some would say annoyance) of 4presenting the user tips at program startup. While this is probably useless to 5the advanced users of the program, the experience shows that the tips may be 6quite helpful for the novices and so more and more programs now do this. 7 8For a wxWidgets programmer, implementing this feature is extremely easy. To 9show a tip, it is enough to just call \helpref{wxShowTip}{wxshowtip} function 10like this: 11 12\begin{verbatim} 13 if ( ...show tips at startup?... ) 14 { 15 wxTipProvider *tipProvider = wxCreateFileTipProvider("tips.txt", 0); 16 wxShowTip(windowParent, tipProvider); 17 delete tipProvider; 18 } 19\end{verbatim} 20 21Of course, you need to get the text of the tips from somewhere - in the example 22above, the text is supposed to be in the file tips.txt from where it is read by 23the {\it tip provider}. The tip provider is just an object of a class deriving 24from \helpref{wxTipProvider}{wxtipprovider}. It has to implement one pure 25virtual function of the base class: \helpref{GetTip}{wxtipprovidergettip}. 26In the case of the tip provider created by 27\helpref{wxCreateFileTipProvider}{wxcreatefiletipprovider}, the tips are just 28the lines of the text file. 29 30If you want to implement your own tip provider (for example, if you wish to 31hardcode the tips inside your program), you just have to derive another class 32from wxTipProvider and pass a pointer to the object of this class to wxShowTip 33- then you don't need wxCreateFileTipProvider at all. 34 35You will probably want to save somewhere the index of the tip last 36shown - so that the program doesn't always show the same tip on startup. As you 37also need to remember whether to show tips or not (you shouldn't do it if the 38user unchecked "Show tips on startup" checkbox in the dialog), you will 39probably want to store both the index of the 40last shown tip (as returned by 41\helpref{wxTipProvider::GetCurrentTip}{wxtipprovidergetcurrenttip} and the flag 42telling whether to show the tips at startup at all. 43 44In a tips.txt file, lines that begin with a \# character are considered comments 45and are automatically skipped. Blank lines and lines only having spaces are also 46skipped. 47 48You can easily add runtime-translation capacity by placing each line of the 49tips.txt file inside the usual translation macro. For example, your tips.txt 50file would look like this: 51 52\begin{verbatim} 53_("This is my first tip") 54_("This is my second tip") 55\end{verbatim} 56 57Now add your tips.txt file into the list of files that gettext searches 58for translatable strings. The tips will thus get included into your 59generated .po file catalog and be translated at runtime along with the rest of 60your application's translatable strings. 61Note1: Each line in the tips.txt file needs to strictly begin with exactly the 623 characters of underscore-parenthesis-doublequote, and end with 63doublequote-parenthesis, as shown above. 64Note2: Remember to escape any doublequote characters within the tip string with 65a backslash-doublequote. 66 67See the dialogs program in your samples folder for a working example inside a 68program. 69 70