customlayout-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/customlayout/customlayout.doc:4 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Customized Layoutmanager</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Customized Layoutmanager</h1> <p> This examples demonstrates how to write customized layout (geometry) managerslike card layouts, border layout and flow layouts.<p> See also: <a href="layout.html">Documentation of Geometry Management</a>.<p> <hr><p> Header file of the flow layout:<p> <pre>/****************************************************************************** $Id: qt/flow.h 3.0.5 edited Oct 12 2001 $**** Definition of simple flow layout for custom layout example**** Created : 979899**** Copyright (C) 1997 by Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#ifndef FLOW_H#define FLOW_H#include <<a href="qlayout-h.html">qlayout.h</a>>#include <<a href="qptrlist-h.html">qptrlist.h</a>>class SimpleFlow : public <a href="qlayout.html">QLayout</a>{public: SimpleFlow( <a href="qwidget.html">QWidget</a> *parent, int border=0, int space=-1, const char *name=0 ) : <a href="qlayout.html">QLayout</a>( parent, border, space, name ), cached_width(0) {} SimpleFlow( <a href="qlayout.html">QLayout</a>* parent, int space=-1, const char *name=0 ) : <a href="qlayout.html">QLayout</a>( parent, space, name ), cached_width(0) {} SimpleFlow( int space=-1, const char *name=0 ) : <a href="qlayout.html">QLayout</a>( space, name ), cached_width(0) {} ~SimpleFlow(); void addItem( <a href="qlayoutitem.html">QLayoutItem</a> *item); bool hasHeightForWidth() const; int heightForWidth( int ) const; <a href="qsize.html">QSize</a> sizeHint() const; <a href="qsize.html">QSize</a> minimumSize() const; <a href="qlayoutiterator.html">QLayoutIterator</a> iterator(); QSizePolicy::ExpandData expanding() const;protected: void setGeometry( const <a href="qrect.html">QRect</a>& );private: int doLayout( const <a href="qrect.html">QRect</a>&, bool testonly = FALSE ); <a href="qptrlist.html">QPtrList</a><QLayoutItem> list; int cached_width; int cached_hfw;};#endif</pre><p> <hr><p> Implementation of the flow layout:<p> <pre>/****************************************************************************** $Id: qt/flow.cpp 3.0.5 edited Oct 12 2001 $**** Implementing your own layout: flow example**** Copyright (C) 1996 by Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#include "flow.h"class SimpleFlowIterator :public <a href="qglayoutiterator.html">QGLayoutIterator</a>{public: SimpleFlowIterator( <a href="qptrlist.html">QPtrList</a><QLayoutItem> *l ) :idx(0), list(l) {} uint count() const; <a href="qlayoutitem.html">QLayoutItem</a> *current(); <a href="qlayoutitem.html">QLayoutItem</a> *next(); <a href="qlayoutitem.html">QLayoutItem</a> *takeCurrent();private: int idx; <a href="qptrlist.html">QPtrList</a><QLayoutItem> *list;};uint <a name="f424"></a>SimpleFlowIterator::count() const{<a name="x1350"></a> return list-><a href="qptrlist.html#count">count</a>();}<a name="x1335"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#current">current</a>(){<a name="x1349"></a> return idx < int(count()) ? list-><a href="qptrlist.html#at">at</a>(idx) : 0;}<a name="x1336"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#next">next</a>(){ idx++; return current();}<a name="x1337"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#takeCurrent">takeCurrent</a>(){<a name="x1351"></a> return idx < int(count()) ? list-><a href="qptrlist.html#take">take</a>( idx ) : 0;}SimpleFlow::~SimpleFlow(){ <a href="qlayout.html#deleteAllItems">deleteAllItems</a>();}<a name="x1344"></a>int SimpleFlow::<a href="qlayoutitem.html#heightForWidth">heightForWidth</a>( int w ) const{ if ( cached_width != w ) { //Not all C++ compilers support "mutable" yet: SimpleFlow * mthis = (SimpleFlow*)this; int h = mthis->doLayout( QRect(0,0,w,0), TRUE ); mthis->cached_hfw = h; return h; } return cached_hfw;}<a name="x1338"></a>void SimpleFlow::<a href="qlayout.html#addItem">addItem</a>( <a href="qlayoutitem.html">QLayoutItem</a> *item){<a name="x1348"></a> list.<a href="qptrlist.html#append">append</a>( item );}<a name="x1343"></a>bool SimpleFlow::<a href="qlayoutitem.html#hasHeightForWidth">hasHeightForWidth</a>() const{ return TRUE;}<a name="x1347"></a>QSize SimpleFlow::<a href="qlayoutitem.html#sizeHint">sizeHint</a>() const{ return minimumSize();}<a name="x1339"></a>QSizePolicy::ExpandData SimpleFlow::<a href="qlayout.html#expanding">expanding</a>() const{ return QSizePolicy::NoDirection;}<a name="x1340"></a>QLayoutIterator SimpleFlow::<a href="qlayout.html#iterator">iterator</a>(){ return QLayoutIterator( new SimpleFlowIterator( &list ) );}<a name="x1342"></a>void SimpleFlow::<a href="qlayout.html#setGeometry">setGeometry</a>( const <a href="qrect.html">QRect</a> &r ){ QLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( r ); doLayout( r );}int <a name="f423"></a>SimpleFlow::doLayout( const <a href="qrect.html">QRect</a> &r, bool testonly ){ int x = r.<a href="qrect.html#x">x</a>(); int y = r.<a href="qrect.html#y">y</a>(); int h = 0; //height of this line so far. <a href="qptrlistiterator.html">QPtrListIterator</a><QLayoutItem> it(list); <a href="qlayoutitem.html">QLayoutItem</a> *o;<a name="x1352"></a> while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) { ++it; int nextX = x + o-><a href="qlayoutitem.html#sizeHint">sizeHint</a>().width() + spacing();<a name="x1353"></a> if ( nextX - spacing() > r.<a href="qrect.html#right">right</a>() && h > 0 ) { x = r.<a href="qrect.html#x">x</a>(); y = y + h + spacing(); nextX = x + o-><a href="qlayoutitem.html#sizeHint">sizeHint</a>().width() + spacing(); h = 0; } if ( !testonly )<a name="x1346"></a> o-><a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( QPoint( x, y ), o-><a href="qlayoutitem.html#sizeHint">sizeHint</a>() ) ); x = nextX; h = QMAX( h, o-><a href="qlayoutitem.html#sizeHint">sizeHint</a>().height() ); } return y + h - r.<a href="qrect.html#y">y</a>();}<a name="x1341"></a>QSize SimpleFlow::<a href="qlayout.html#minimumSize">minimumSize</a>() const{ <a href="qsize.html">QSize</a> s(0,0); <a href="qptrlistiterator.html">QPtrListIterator</a><QLayoutItem> it(list); <a href="qlayoutitem.html">QLayoutItem</a> *o; while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) { ++it;<a name="x1356"></a><a name="x1345"></a> s = s.<a href="qsize.html#expandedTo">expandedTo</a>( o-><a href="qlayoutitem.html#minimumSize">minimumSize</a>() ); } return s;}</pre><p> <hr><p> Header file of the border layout:<p> <pre>/****************************************************************************** $Id: qt/border.h 3.0.5 edited Oct 12 2001 $**** Definition of simple flow layout for custom layout example**** Created : 979899**** Copyright (C) 1997 by Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#ifndef BORDER_H#define BORDER_H#include <<a href="qlayout-h.html">qlayout.h</a>>#include <<a href="qptrlist-h.html">qptrlist.h</a>>class BorderWidgetItem : public <a href="qwidgetitem.html">QWidgetItem</a>{public: BorderWidgetItem( <a href="qwidget.html">QWidget</a> *w ) : <a href="qwidgetitem.html">QWidgetItem</a>( w ) {} void setGeometry( const <a href="qrect.html">QRect</a> &r ) { widget()->setGeometry( r ); }};class BorderLayout : public <a href="qlayout.html">QLayout</a>{public: enum Position { West = 0, North, South, East, Center }; struct BorderLayoutStruct { BorderLayoutStruct( <a href="qlayoutitem.html">QLayoutItem</a> *i, Position p ) { item = i;⌨️ 快捷键说明
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