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<H4 ALIGN="LEFT"><A NAME="Heading11"></A><FONT COLOR="#000077">The Changes Browser</FONT></H4>
<P>Each time you make a change to either the class hierarchy or to a method, ST/X writes a record to a <TT>changes</TT> file. The Changes Browser enables you to inspect and manipulate the changes file. There are two subviews in the Changes Browser: the change list and the contents view. The change list gives a list of all changes in chronological order. An example Changes Browser is shown in Figure 31.10.</P>
<P><A NAME="Fig10"></A><A HREF="javascript:displayWindow('images/31-10.jpg',570,290 )"><IMG SRC="images/31-10t.jpg"></A>
<BR><A HREF="javascript:displayWindow('images/31-10.jpg',570,290)"><FONT COLOR="#000077"><B>Figure 31.10.</B></FONT></A> The Changes Browser.</P>
<P>To display a change, select one of the changes from the change list. The Changes Browser then displays the contents of the change in the contents view.
</P>
<P>The pop-up menu for the change list has the functions described in Table 31.6.</P>
<TABLE WIDTH="100%"><CAPTION ALIGN=LEFT><B>Table 31.6.</B> The Change List pop-up menu.
<TR>
<TH COLSPAN="2"><HR>
<TR>
<TH WIDTH="30%" ALIGN="LEFT">Function
<TH WIDTH="70%" ALIGN="LEFT">Description
<TR>
<TD COLSPAN="2"><HR>
<TR>
<TD><TT>apply change</TT>
<TD>Applies the currently selected change.
<TR>
<TD VALIGN="TOP"><TT>apply to end</TT>
<TD>Applies all the changes from the currently selected change to the end of the changes file.
<TR>
<TD><TT>apply all changes</TT>
<TD>Applies all the changes in the file.
<TR>
<TD><TT>delete</TT>
<TD>Deletes the currently selected change from the list.
<TR>
<TD VALIGN="TOP"><TT>delete to end</TT>
<TD>Deletes all changes from the currently selected change to the end of the file.
<TR>
<TD><TT>delete changes for</TT>
<TD>Deletes all changes affecting the same class.
<TR>
<TD VALIGN="TOP"><TT>delete all changes</TT>
<TD>Deletes all changes in the file for the same class as the currently selected change.
<TR>
<TD><TT>update</TT>
<TD>Rereads the changes file.
<TR>
<TD VALIGN="TOP"><TT>compress</TT>
<TD>Compresses the change list and removes multiple changes for a method leaving the most recent change compared to the current change.
<TR>
<TD VALIGN="TOP"><TT>version</TT>
<TD>Compares a method’s source code in a change with the current version of the method and outputs a message in the Transcript view.
<TR>
<TD VALIGN="TOP"><TT>make a change patch</TT>
<TD>Appends the change to the end of the patches file which will be run and automatically applied at ST/X startup.
<TR>
<TD VALIGN="TOP"><TT>update sourcefile</TT>
<TD>This function is not currently implemented.<TT>from change</TT>
<TR>
<TD VALIGN="TOP"><TT>writeback</TT>
<TD>Writes the change list back to the <TT>changefile</TT> changes file. All delete/compress operations performed in the Changes Browser will not affect the changes file unless this operation is performed.
<TR>
<TD COLSPAN="2"><HR>
</TABLE>
<P>The Changes Browser can be used to recover from a system crash by reapplying all changes that were made after the last snapshot entry. To control the size of the changes file, it is a good idea to apply a compress periodically. This will remove all old changes for a method, leaving the newest one.
</P>
<H4 ALIGN="LEFT"><A NAME="Heading12"></A><FONT COLOR="#000077">Directory Browser</FONT></H4>
<P>When you select the Directory Browser option, a browser with five subviews is displayed. The top half of the browser displays the current directory and all subdirectories and files contained in it. If you select a directory, it is expanded in the next section to the right across the top half of the browser. If you select a file, the contents of the file are displayed in the lower half of the browser. The pop-up menu for the directory area has only two functions:
</P>
<DL>
<DD><B>•</B> <TT>up</TT>—Moves up to the directory above the one selected
<DD><B>•</B> <TT>goto directory</TT>—Enables you to go to a specified directory
</DL>
<P>The content view has the same edit menu as all the other text editors and is discussed in the “Editing in Browsers” section in this chapter. A typical Directory Browser is shown in Figure 31.11.
</P>
<P><A NAME="Fig11"></A><A HREF="javascript:displayWindow('images/31-11.jpg',574,288 )"><IMG SRC="images/31-11t.jpg"></A>
<BR><A HREF="javascript:displayWindow('images/31-11.jpg',574,288)"><FONT COLOR="#000077"><B>Figure 31.11.</B></FONT></A> The Directory Browser.</P>
<H3><A NAME="Heading13"></A><FONT COLOR="#000077">The Workspace Option</FONT></H3>
<P>The Workspace option displays a view from which you can enter and compile Smalltalk code. The Workspace is usually used as a testing area or scratch pad when coding. You can use it to test your Smalltalk code before building it into the code library using the System Browser code view.
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