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<table border="0" cellspacing="0" cellpadding="3" width="100%"><tr><td> <div align="center" id="bldcontent"> <a href="../default.htm"><img src="../images/opendocs.png" width="63" height="76" border="0"></a> <br> <div class="symbol">Your OpenSource Publisher™</div> </div> </td></tr></table> <div align="center" class="author"> <a href="../products.lxp">Products</a> | <a href="../wheretobuy.lxp">Where to buy</a> | <a href="../bookstore.lxp">Retailers</a> | <a href="../faq.lxp">FAQ</a> | <a href="../writeforus.lxp">Write for Us.</a> | <a href="#contact">Contact Us.</a> </div> <table border="0" cellspacing="3" cellpadding="0" width="100%"><tr><td width="100%"> <div class="content"> <table border="0" cellspacing="2" cellpadding="0" width="100%"><tr><td width="100%"> <div align="center"><H4 CLASS="AUTHOR"><A NAME="AEN5">Boudewijn Rempt</A><br><a href="../../https@secure.linuxports.com/opendocs/default.htm"><img src=odpyqt125.png></a><br>ISBN: 0-97003300-4-4<br><a href="../../https@secure.linuxports.com/opendocs/default.htm">Available from bookstores everywhere or you can order it here.</a><p>You can download the source files for the book <a href="pyqtsrc.tgz">(code / eps) here.</a><hr></div> <HTML><HEAD><TITLE>A stack of documents</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.72"><LINKREL="HOME"TITLE="GUI Programming with Python: QT Edition"HREF="book1.htm"><LINKREL="UP"TITLE="User Interface Paradigms"HREF="c5584.htm"><LINKREL="PREVIOUS"TITLE="A row of split windows"HREF="x5679.htm"><LINKREL="NEXT"TITLE="A more complex view management solution"HREF="x5722.htm"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GUI Programming with Python: QT Edition</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><A accesskey="P" href="index.lxp@lxpwrap=x5679_252ehtm.htm">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 16. User Interface Paradigms</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><A accesskey="N" href="index.lxp@lxpwrap=x5722_252ehtm.htm">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1">A stack of documents</A></H1><P>I said I wouldn't do an emacs-like stack of documents without any surrounding GUI — but it was so easy. PyQt contains a very basic class, <TTCLASS="CLASSNAME">QWidgetStack</TT>, which can contain any number of widgets, though only one is shown at a time. This class is used in <TTCLASS="CLASSNAME">QWizard</TT>, <TTCLASS="CLASSNAME">QTabWidget</TT> and <TTCLASS="CLASSNAME">QTabDialog</TT>, but it can be very useful when used by itself, too.</P><PRECLASS="PROGRAMLISTING">"""stackspace.py - stacked view manager for the mdi frameworkcopyright: (C) 2001, Boudewijn Remptemail: boud@rempt.xs4all.nl"""from qt import *from resources import TRUE, FALSEclass StackSpace(QWidgetStack): def __init__(self, *args): apply(QWidgetStack.__init__,(self, ) + args) self.views=[] def addView(self, view): self.views.append(view) self.addWidget(view, len(self.views) - 1) self.raiseWidget(view) def removeView(self, view): if view in self.views: self.views.remove(view) self.removeWidget(view) </PRE><P><TTCLASS="CLASSNAME">QWidgetStack</TT> is one of those classes that wants its children to be explicitly added and removed. You also have to give a numerical ID to identify the widget.</P><PRECLASS="PROGRAMLISTING"> def activeWindow(self): return self.visibleWidget() def cascade(self): pass def tile(self): pass def canCascade(self): return FALSE def canTile(self): return FALSE def windowList(self): return self.views def activateView(self, view): self.raiseWidget(view) </PRE><P>In contrast with all other view managers we have created up to now, <TTCLASS="CLASSNAME">QWidgetStack</TT> does not automatically raise a window when it gets focus. This means that we have to add a new method to the view manager interface— <TTCLASS="FUNCTION">activateView</TT>. This has to be added to all other view managers, too, and there is a small change necessary in the application class <TTCLASS="CLASSNAME">MDIApp</TT>:</P><PRECLASS="PROGRAMLISTING"> def slotWindowMenuActivated(self, index): self.menuToWindowMap[index].setFocus() </PRE><P>becomes:</P><PRECLASS="PROGRAMLISTING"> def slotWindowMenuActivated(self, index): self.workspace.activateView(self.menuToWindowMap[index]) </PRE><P>Of course, this is merely an example of the use of <TTCLASS="CLASSNAME">QWidgetStack</TT>. If you want to present your users with stacked document windows, you ought to offer more than a mere ‘window' menu for selecting windows— A keyboard interface, for instance, or perhaps a listview with icons for open documents to the left.</P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><A accesskey="P" href="index.lxp@lxpwrap=x5679_252ehtm.htm">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><A accesskey="H" href="index.lxp@lxpwrap=book1_252ehtm">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><A accesskey="N" href="index.lxp@lxpwrap=x5722_252ehtm.htm">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">A row of split windows</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><A accesskey="U" href="index.lxp@lxpwrap=c5584_252ehtm.htm">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">A more complex view management solution</TD></TR></TABLE></DIV></BODY></HTML> </td> </tr> </table> </td> </tr> </table> ⌨️ 快捷键说明
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