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<TITLE>StatusBar - Showing progress bar in a status bar pane (2)</TITLE>
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<FONT COLOR="#000099">Showing progress bar in a status bar pane (2)</FONT></H3></CENTER>
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This article was contributed by
<A HREF="mailto:Chris.Maunder@cbr.clw.csiro.au">Chris Maunder</A>.
<br><br><IMG SRC="progress_in_status2.gif">
<br>Download <A HREF="progress_in_status2_src.zip">source files</A> and
<A HREF="progress_in_status2_demo.zip">demo project</A>.<br>
<p>
Adding a CProgressCtrl to the status bar has already been addressed
by Brad Mann. His method involved modifying the status bar and messing
around with the resource editor. I developed a separate CProgressBar
class in order to allow the programmer to just drop in a progress bar
whereever they wanted using a single "CProgressBar Bar(...)" declaration,
which would initialise and display itself and clean up after itself
after it was done. The progress bar can also be created once (say as a
member variable) and reused multiple times. This new version of the
progress bar also resizes itself if the status bar size changes.
</p>
<p>
The progress bar lets you specify a message (displayed to the left of the bar)
and a Progress Control bar in the first pane of your applications status bar
(if it has one - thanks to Patty You for a bug fix on that one). The message
for the progress bar can be changed at any time, as can the size and range
of the bar.
</p>
<p><b>Construction</b></p>
<PRE><TT><FONT COLOR="#990000">
CProgressBar();
CProgressBar(LPCTSTR strMessage, int nSize=100, int MaxValue=100, BOOL bSmooth=FALSE);
BOOL Create(LPCTSTR strMessage, int nSize=100, int MaxValue=100, BOOL bSmooth=FALSE);
</FONT></TT></PRE>
<p>
Construction is either via the constructor or a two-step process using the
constructor and the "Create" function. "strMessage" is the message to be
displayed, "nSize" is the percentage width of the status bar that will be
occupied by the bar (including the text), and "MaxValue" is the maximum
range of the bar.</p>
<p>
"bSmooth" will only be effective if you have the header files and commctrl32.dll
from IE 3.0 or above (no problems for MS VC 5.0). It specifies whether the progress
bar will be smooth or chunky.
</p>
<p><b>Operations</b></p>
<PRE><TT><FONT COLOR="#990000">
BOOL Success() // Construction successful?
int SetPos(int nPos); // Same as CProgressCtrl
int OffsetPos(int nPos); // Same as CProgressCtrl
int SetStep(int nStep); // Same as CProgressCtrl
int StepIt(); // Same as CProgressCtrl
void Clear(); // Clear the status bar
void SetRange(int nLower, int nUpper, int nStep = 1);
// Set min, max and step size
void SetText(LPCTSTR strMessage); // Set the message
void SetSize(int nSize); // Set the bar size
</FONT></TT></PRE>
<p>To use the bar, just do something like:
<PRE><TT><FONT COLOR="#990000">
CProgressBar Bar("Testing", 40, 1000);
for (int i = 0; i < 1000; i++) {
// perform operation
Bar.StepIt();
}
</FONT></TT></PRE>
or it can be done two stage as:
<PRE><TT><FONT COLOR="#990000">
CProgressBar bar;
bar.Create("Processing", 40, 1000);
for (int i = 0; i < 1000; i++) {
// perform operation
bar.StepIt();
}
bar.SetText("Writing");
for (int i = 0; i < 1000; i++) {
// perform operation
bar.StepIt();
PeekAndPump(); // Message pump
}
bar.Clear();
</FONT></TT></PRE>
<p>
In the above case, PeekAndPump() is a function which simply peeks and pumps
messages, allowing user interaction with the window during a lengthy process.
If the window size changes during the processing, the progress bar size will
alsow change.
</p>
<p>Updated 30 May 1998.
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<CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER>
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