From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sun, 10 Jul 2011 15:24:15 -0500 Subject: Add Qt3 development HEAD version --- doc/html/layout-example.html | 211 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 211 insertions(+) create mode 100644 doc/html/layout-example.html (limited to 'doc/html/layout-example.html') diff --git a/doc/html/layout-example.html b/doc/html/layout-example.html new file mode 100644 index 0000000..8f8bf95 --- /dev/null +++ b/doc/html/layout-example.html @@ -0,0 +1,211 @@ + + + + + +Layout Managers + + + + + + + +

Layout Managers

+ + +

+This example shows simple and intermediate use of Qt's layout +classes, QGridLayout, QBoxLayout etc. +

Implementation: +

/****************************************************************************
+** $Id: qt/layout.cpp   3.3.8   edited Jan 11 14:37 $
+**
+** Copyright (C) 1992-2007 Trolltech ASA.  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 <qapplication.h>
+#include <qlabel.h>
+#include <qcolor.h>
+#include <qpushbutton.h>
+#include <qlayout.h>
+#include <qlineedit.h>
+#include <qmultilineedit.h>
+#include <qmenubar.h>
+#include <qpopupmenu.h>
+
+class ExampleWidget : public QWidget
+{
+public:
+    ExampleWidget( QWidget *parent = 0, const char *name = 0 );
+    ~ExampleWidget();
+};
+
+ExampleWidget::ExampleWidget( QWidget *parent, const char *name )
+    : QWidget( parent, name )
+{
+    // Make the top-level layout; a vertical box to contain all widgets
+    // and sub-layouts.
+    QBoxLayout *topLayout = new QVBoxLayout( this, 5 );
+
+    // Create a menubar...
+    QMenuBar *menubar = new QMenuBar( this );
+    menubar->setSeparator( QMenuBar::InWindowsStyle );
+    QPopupMenu* popup;
+    popup = new QPopupMenu( this );
+    popup->insertItem( "&Quit", qApp, SLOT(quit()) );
+    menubar->insertItem( "&File", popup );
+
+    // ...and tell the layout about it.
+    topLayout->setMenuBar( menubar );
+
+    // Make an hbox that will hold a row of buttons.
+    QBoxLayout *buttons = new QHBoxLayout( topLayout );
+    int i;
+    for ( i = 1; i <= 4; i++ ) {
+        QPushButton* but = new QPushButton( this );
+        QString s;
+        s.sprintf( "Button %d", i );
+        but->setText( s );
+
+        // Set horizontal stretch factor to 10 to let the buttons
+        // stretch horizontally. The buttons will not stretch
+        // vertically, since bigWidget below will take up vertical
+        // stretch.
+        buttons->addWidget( but, 10 );
+        // (Actually, the result would have been the same with a
+        // stretch factor of 0; if no items in a layout have non-zero
+        // stretch, the space is divided equally between members.)
+    }
+
+    // Make another hbox that will hold a left-justified row of buttons.
+    QBoxLayout *buttons2 = new QHBoxLayout( topLayout );
+
+    QPushButton* but = new QPushButton( "Button five", this );
+    buttons2->addWidget( but );
+
+    but = new QPushButton( "Button 6", this );
+    buttons2->addWidget( but );
+
+    // Fill up the rest of the hbox with stretchable space, so that
+    // the buttons get their minimum width and are pushed to the left.
+    buttons2->addStretch( 10 );
+
+    // Make  a big widget that will grab all space in the middle.
+    QMultiLineEdit *bigWidget = new QMultiLineEdit( this );
+    bigWidget->setText( "This widget will get all the remaining space" );
+    bigWidget->setFrameStyle( QFrame::Panel | QFrame::Plain );
+
+    // Set vertical stretch factor to 10 to let the bigWidget stretch
+    // vertically. It will stretch horizontally because there are no
+    // widgets beside it to take up horizontal stretch.
+    //    topLayout->addWidget( bigWidget, 10 );
+    topLayout->addWidget( bigWidget );
+
+    // Make a grid that will hold a vertical table of QLabel/QLineEdit
+    // pairs next to a large QMultiLineEdit.
+
+    // Don't use hard-coded row/column numbers in QGridLayout, you'll
+    // regret it when you have to change the layout.
+    const int numRows = 3;
+    const int labelCol = 0;
+    const int linedCol = 1;
+    const int multiCol = 2;
+
+    // Let the grid-layout have a spacing of 10 pixels between
+    // widgets, overriding the default from topLayout.
+    QGridLayout *grid = new QGridLayout( topLayout, 0, 0, 10 );
+    int row;
+
+    for ( row = 0; row < numRows; row++ ) {
+        QLineEdit *ed = new QLineEdit( this );
+        // The line edit goes in the second column
+        grid->addWidget( ed, row, linedCol );
+
+        // Make a label that is a buddy of the line edit
+        QString s;
+        s.sprintf( "Line &%d", row+1 );
+        QLabel *label = new QLabel( ed, s, this );
+        // The label goes in the first column.
+        grid->addWidget( label, row, labelCol );
+    }
+
+    // The multiline edit will cover the entire vertical range of the
+    // grid (rows 0 to numRows) and stay in column 2.
+
+    QMultiLineEdit *med = new QMultiLineEdit( this );
+    grid->addMultiCellWidget( med, 0, -1, multiCol, multiCol );
+
+    // The labels will take the space they need. Let the remaining
+    // horizontal space be shared so that the multiline edit gets
+    // twice as much as the line edit.
+    grid->setColStretch( linedCol, 10 );
+    grid->setColStretch( multiCol, 20 );
+
+    // Add a widget at the bottom.
+    QLabel* sb = new QLabel( this );
+    sb->setText( "Let's pretend this is a status bar" );
+    sb->setFrameStyle( QFrame::Panel | QFrame::Sunken );
+    // This widget will use all horizontal space, and have a fixed height.
+
+    // we should have made a subclass and implemented sizePolicy there...
+    sb->setFixedHeight( sb->sizeHint().height() );
+
+    sb->setAlignment( AlignVCenter | AlignLeft );
+    topLayout->addWidget( sb );
+
+    topLayout->activate();
+}
+
+ExampleWidget::~ExampleWidget()
+{
+    // All child widgets are deleted by Qt.
+    // The top-level layout and all its sub-layouts are deleted by Qt.
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    ExampleWidget f;
+    a.setMainWidget(&f);
+    f.setCaption("Qt Example - Layouts");
+    f.show();
+
+    return a.exec();
+}
+

+ +