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<title>Layout Managers</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Layout Managers</h1>
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<p>
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This example shows simple and intermediate use of TQt's layout
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classes, <a href="tqgridlayout.html">TQGridLayout</a>, <a href="tqboxlayout.html">TQBoxLayout</a> etc.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/layout.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="tqapplication-h.html">tqapplication.h</a>>
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#include <<a href="tqlabel-h.html">tqlabel.h</a>>
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#include <<a href="tqcolor-h.html">tqcolor.h</a>>
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#include <<a href="tqpushbutton-h.html">tqpushbutton.h</a>>
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#include <<a href="tqlayout-h.html">tqlayout.h</a>>
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#include <<a href="tqlineedit-h.html">tqlineedit.h</a>>
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#include <<a href="tqmultilineedit-h.html">tqmultilineedit.h</a>>
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#include <<a href="tqmenubar-h.html">tqmenubar.h</a>>
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#include <<a href="tqpopupmenu-h.html">tqpopupmenu.h</a>>
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class ExampleWidget : public <a href="tqwidget.html">TQWidget</a>
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{
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public:
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ExampleWidget( <a href="tqwidget.html">TQWidget</a> *parent = 0, const char *name = 0 );
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~ExampleWidget();
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};
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<a name="f260"></a>ExampleWidget::ExampleWidget( <a href="tqwidget.html">TQWidget</a> *parent, const char *name )
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: <a href="tqwidget.html">TQWidget</a>( parent, name )
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{
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// Make the top-level layout; a vertical box to contain all widgets
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// and sub-layouts.
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<a href="tqboxlayout.html">TQBoxLayout</a> *topLayout = new <a href="tqvboxlayout.html">TQVBoxLayout</a>( this, 5 );
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// Create a menubar...
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<a href="tqmenubar.html">TQMenuBar</a> *menubar = new <a href="tqmenubar.html">TQMenuBar</a>( this );
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<a name="x540"></a> menubar-><a href="tqmenubar.html#setSeparator">setSeparator</a>( TQMenuBar::InWindowsStyle );
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<a href="tqpopupmenu.html">TQPopupMenu</a>* popup;
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popup = new <a href="tqpopupmenu.html">TQPopupMenu</a>( this );
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popup-><a href="tqmenudata.html#insertItem">insertItem</a>( "&Quit", tqApp, TQ_SLOT(<a href="tqapplication.html#quit">quit</a>()) );
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menubar-><a href="tqmenudata.html#insertItem">insertItem</a>( "&File", popup );
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// ...and tell the layout about it.
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<a name="x539"></a> topLayout-><a href="tqlayout.html#setMenuBar">setMenuBar</a>( menubar );
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// Make an hbox that will hold a row of buttons.
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<a href="tqboxlayout.html">TQBoxLayout</a> *buttons = new <a href="tqhboxlayout.html">TQHBoxLayout</a>( topLayout );
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int i;
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for ( i = 1; i <= 4; i++ ) {
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<a href="tqpushbutton.html">TQPushButton</a>* but = new <a href="tqpushbutton.html">TQPushButton</a>( this );
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<a href="tqstring.html">TQString</a> s;
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<a name="x542"></a> s.<a href="tqstring.html#sprintf">sprintf</a>( "Button %d", i );
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<a name="x530"></a> but-><a href="tqbutton.html#setText">setText</a>( s );
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// Set horizontal <a href="layout.html#stretch-factor">stretch factor</a> to 10 to let the buttons
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// stretch horizontally. The buttons will not stretch
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// vertically, since bigWidget below will take up vertical
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// stretch.
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<a name="x529"></a> buttons-><a href="tqboxlayout.html#addWidget">addWidget</a>( but, 10 );
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// (Actually, the result would have been the same with a
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// stretch factor of 0; if no items in a layout have non-zero
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// stretch, the space is divided equally between members.)
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}
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// Make another hbox that will hold a left-justified row of buttons.
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<a href="tqboxlayout.html">TQBoxLayout</a> *buttons2 = new <a href="tqhboxlayout.html">TQHBoxLayout</a>( topLayout );
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<a href="tqpushbutton.html">TQPushButton</a>* but = new <a href="tqpushbutton.html">TQPushButton</a>( "Button five", this );
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buttons2-><a href="tqboxlayout.html#addWidget">addWidget</a>( but );
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but = new <a href="tqpushbutton.html">TQPushButton</a>( "Button 6", this );
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buttons2-><a href="tqboxlayout.html#addWidget">addWidget</a>( but );
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// Fill up the rest of the hbox with stretchable space, so that
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// the buttons get their minimum width and are pushed to the left.
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<a name="x528"></a> buttons2-><a href="tqboxlayout.html#addStretch">addStretch</a>( 10 );
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// Make a big widget that will grab all space in the middle.
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<a href="tqmultilineedit.html">TQMultiLineEdit</a> *bigWidget = new <a href="tqmultilineedit.html">TQMultiLineEdit</a>( this );
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bigWidget-><a href="tqtextedit.html#setText">setText</a>( "This widget will get all the remaining space" );
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<a name="x531"></a> bigWidget-><a href="tqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::Panel | TQFrame::Plain );
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// Set vertical stretch factor to 10 to let the bigWidget stretch
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// vertically. It will stretch horizontally because there are no
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// widgets beside it to take up horizontal stretch.
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// topLayout-><a href="tqboxlayout.html#addWidget">addWidget</a>( bigWidget, 10 );
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topLayout-><a href="tqboxlayout.html#addWidget">addWidget</a>( bigWidget );
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// Make a grid that will hold a vertical table of TQLabel/TQLineEdit
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// pairs next to a large TQMultiLineEdit.
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// Don't use hard-coded row/column numbers in TQGridLayout, you'll
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// regret it when you have to change the layout.
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const int numRows = 3;
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const int labelCol = 0;
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const int linedCol = 1;
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const int multiCol = 2;
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// Let the grid-layout have a spacing of 10 pixels between
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// widgets, overriding the default from topLayout.
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<a href="tqgridlayout.html">TQGridLayout</a> *grid = new <a href="tqgridlayout.html">TQGridLayout</a>( topLayout, 0, 0, 10 );
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int row;
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for ( row = 0; row < numRows; row++ ) {
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<a href="tqlineedit.html">TQLineEdit</a> *ed = new <a href="tqlineedit.html">TQLineEdit</a>( this );
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// The line edit goes in the second column
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<a name="x533"></a> grid-><a href="tqgridlayout.html#addWidget">addWidget</a>( ed, row, linedCol );
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// Make a label that is a buddy of the line edit
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<a href="tqstring.html">TQString</a> s;
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s.<a href="tqstring.html#sprintf">sprintf</a>( "Line &%d", row+1 );
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<a href="tqlabel.html">TQLabel</a> *label = new <a href="tqlabel.html">TQLabel</a>( ed, s, this );
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// The label goes in the first column.
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grid-><a href="tqgridlayout.html#addWidget">addWidget</a>( label, row, labelCol );
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}
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// The multiline edit will cover the entire vertical range of the
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// grid (rows 0 to numRows) and stay in column 2.
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<a href="tqmultilineedit.html">TQMultiLineEdit</a> *med = new <a href="tqmultilineedit.html">TQMultiLineEdit</a>( this );
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<a name="x532"></a> grid-><a href="tqgridlayout.html#addMultiCellWidget">addMultiCellWidget</a>( med, 0, -1, multiCol, multiCol );
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// The labels will take the space they need. Let the remaining
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// horizontal space be shared so that the multiline edit gets
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// twice as much as the line edit.
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<a name="x534"></a> grid-><a href="tqgridlayout.html#setColStretch">setColStretch</a>( linedCol, 10 );
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grid-><a href="tqgridlayout.html#setColStretch">setColStretch</a>( multiCol, 20 );
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// Add a widget at the bottom.
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<a href="tqlabel.html">TQLabel</a>* sb = new <a href="tqlabel.html">TQLabel</a>( this );
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sb-><a href="tqlabel.html#setText">setText</a>( "Let's pretend this is a status bar" );
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sb-><a href="tqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::Panel | TQFrame::Sunken );
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// This widget will use all horizontal space, and have a fixed height.
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// we should have made a subclass and implemented sizePolicy there...
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<a name="x545"></a><a name="x537"></a> sb-><a href="tqwidget.html#setFixedHeight">setFixedHeight</a>( sb-><a href="tqwidget.html#sizeHint">sizeHint</a>().height() );
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<a name="x535"></a> sb-><a href="tqlabel.html#setAlignment">setAlignment</a>( AlignVCenter | AlignLeft );
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topLayout-><a href="tqboxlayout.html#addWidget">addWidget</a>( sb );
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<a name="x538"></a> topLayout-><a href="tqlayout.html#activate">activate</a>();
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}
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ExampleWidget::~ExampleWidget()
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{
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// All child widgets are deleted by TQt.
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// The top-level layout and all its sub-layouts are deleted by TQt.
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}
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int main( int argc, char **argv )
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{
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<a href="tqapplication.html">TQApplication</a> a( argc, argv );
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ExampleWidget f;
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a.<a href="tqapplication.html#setMainWidget">setMainWidget</a>(&f);
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f.<a href="tqwidget.html#setCaption">setCaption</a>("TQt Example - Layouts");
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f.<a href="tqwidget.html#show">show</a>();
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return a.<a href="tqapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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