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<TITLE>Controls - A Popup Progress Window</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
A Popup Progress Window
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This article was contributed by <A HREF="mailto:Chris.Maunder@cbr.clw.csiro.au">Chris Maunder</A>.
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<IMG SRC="progress_wnd.gif"><A HREF="progress_wnd.zip">Download source files</A> (5 Kb)
or a <A HREF="progress_wnd_demo.zip">Sample project</A> (38 Kb)
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<p>
There are many occasions where it's nice to have a poopup window
that shows the progress of a lengthy operation. Incorporating a
dialog resource with a progress control and cancel button, then
linking up the control messages for every project you wish to have
the progress window can get monotonous and messy.</p>
<p>The class <b>CProgressWnd</b> is a simple drop in window that
contains a progress control, a cancel button and a text area for
messages. The text area can display 4 lines of text as default,
although this can be changed using CProgressWnd::SetWindowSize()
(below)</p>
<p><b>Construction</b></p>
<PRE><TT><FONT COLOR="#990000"> CProgressWnd();
CProgressWnd(CWnd* pParent, LPCTSTR strTitle, BOOL bSmooth=FALSE);
BOOL Create(CWnd* pParent, LPCTSTR strTitle, 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. "pParent" is the parent of the progress
window, "strTitle" is the window caption title. "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"> 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 SetRange(int nLower, int nUpper, int nStep = 1);
// Set min, max and step size
void Hide(); // Hide the window
void Show(); // Show the window
void Clear(); // Clear the text and reset the progress bar
void SetText(LPCTSTR fmt, ...); // Set the text in the text area
BOOL Cancelled() // Has the cancel button been pressed?
void SetWindowSize(int nNumTextLines, int nWindowWidth = 390);
// Sets the size of the window according to
// the number of text lines specifed and the
// desired window size in pixels.
void PeekAndPump(BOOL bCancelOnESCkey = TRUE, BOOL bModal = FALSE);
// Message pumping, with options of allowing
// Cancel on ESC key, and modal operation only
</FONT></TT></PRE>
<p>The PeekAndPump function allows messages to be pumped during long
operations. The first parameter allows the window to be cancelled by pressing
the ESC key, while the second parameter will allow you to make the window behave
as a modal window, meaning messages will only be passed to the progress window
(and its children), and not the main application itself.
<p>To use the bar, just do something like:
<PRE><TT><FONT COLOR="#990000">
CProgressWnd wndProgress(this, "Progress");
wndProgress.SetRange(0,5000);
wndProgress.SetText("Processing...");
for (int i = 0; i < 5000; i++) {
wndProgress.StepIt();
wndProgress.PeekAndPump();
if (wndProgress.Cancelled()) {
MessageBox("Progress Cancelled");
break;
}
}
</FONT></TT></PRE>
or it can be done two stage as:
<PRE><TT><FONT COLOR="#990000">
CProgressWnd wndProgress;
if (!wndProgress.Create(this, "Progress"))
return;
wndProgress.SetRange(0,5000);
wndProgress.SetText("Processing...");
</FONT></TT></PRE>
<p>Last updated: 18 May 1998
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