6 files changed, 216 insertions, 0 deletions
diff --git a/examples/hello/README b/examples/hello/README
new file mode 100644
index 0000000..1d95601
--- /dev/null
+++ b/examples/hello/README
@@ -0,0 +1,3 @@
+Since the classic "hello world" program is too trivial in Qt, We made
+this one - it draws the words "hello world" moving around and in
+rainbow colors.
diff --git a/examples/hello/hello.cpp b/examples/hello/hello.cpp
new file mode 100644
index 0000000..a13b0f5
--- /dev/null
+++ b/examples/hello/hello.cpp
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 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 "hello.h"
+#include <qpushbutton.h>
+#include <qtimer.h>
+#include <qpainter.h>
+#include <qpixmap.h>
+
+
+/*
+  Constructs a Hello widget. Starts a 40 ms animation timer.
+*/
+
+Hello::Hello( const char *text, QWidget *parent, const char *name )
+    : QWidget(parent,name), t(text), b(0)
+{
+    QTimer *timer = new QTimer(this);
+    connect( timer, SIGNAL(timeout()), SLOT(animate()) );
+    timer->start( 40 );
+
+    resize( 260, 130 );
+}
+
+
+/*
+  This private slot is called each time the timer fires.
+*/
+
+void Hello::animate()
+{
+    b = (b + 1) & 15;
+    repaint( FALSE );
+}
+
+
+/*
+  Handles mouse button release events for the Hello widget.
+
+  We emit the clicked() signal when the mouse is released inside
+  the widget.
+*/
+
+void Hello::mouseReleaseEvent( QMouseEvent *e )
+{
+    if ( rect().contains( e->pos() ) )
+        emit clicked();
+}
+
+
+/*
+  Handles paint events for the Hello widget.
+
+  Flicker-free update. The text is first drawn in the pixmap and the
+  pixmap is then blt'ed to the screen.
+*/
+
+void Hello::paintEvent( QPaintEvent * )
+{
+    static int sin_tbl[16] = {
+        0, 38, 71, 92, 100, 92, 71, 38,	0, -38, -71, -92, -100, -92, -71, -38};
+
+    if ( t.isEmpty() )
+        return;
+
+    // 1: Compute some sizes, positions etc.
+    QFontMetrics fm = fontMetrics();
+    int w = fm.width(t) + 20;
+    int h = fm.height() * 2;
+    int pmx = width()/2 - w/2;
+    int pmy = height()/2 - h/2;
+
+    // 2: Create the pixmap and fill it with the widget's background
+    QPixmap pm( w, h );
+    pm.fill( this, pmx, pmy );
+
+    // 3: Paint the pixmap. Cool wave effect
+    QPainter p;
+    int x = 10;
+    int y = h/2 + fm.descent();
+    int i = 0;
+    p.begin( &pm );
+    p.setFont( font() );
+    while ( !t[i].isNull() ) {
+        int i16 = (b+i) & 15;
+        p.setPen( QColor((15-i16)*16,255,255,QColor::Hsv) );
+        p.drawText( x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1 );
+        x += fm.width( t[i] );
+        i++;
+    }
+    p.end();
+
+    // 4: Copy the pixmap to the Hello widget
+    bitBlt( this, pmx, pmy, &pm );
+}
diff --git a/examples/hello/hello.doc b/examples/hello/hello.doc
new file mode 100644
index 0000000..8c001a2
--- /dev/null
+++ b/examples/hello/hello.doc
@@ -0,0 +1,30 @@
+
+/*
+*/
+/*!   \page hello-example.html
+
+  \ingroup examples
+  \title Hello, World
+
+  This example brings up the words "Hello, World" moving up and down,
+  and in different colors.
+
+  <hr>
+
+  Header file:
+
+  \include hello/hello.h
+
+  <hr>
+
+  Implementation:
+
+  \include hello/hello.cpp
+
+  <hr>
+
+  Main:
+
+  \include hello/main.cpp
+*/
+
diff --git a/examples/hello/hello.h b/examples/hello/hello.h
new file mode 100644
index 0000000..6b47d46
--- /dev/null
+++ b/examples/hello/hello.h
@@ -0,0 +1,33 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 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.
+**
+*****************************************************************************/
+
+#ifndef HELLO_H
+#define HELLO_H
+
+#include <qwidget.h>
+
+
+class Hello : public QWidget
+{
+    Q_OBJECT
+public:
+    Hello( const char *text, QWidget *parent=0, const char *name=0 );
+signals:
+    void clicked();
+protected:
+    void mouseReleaseEvent( QMouseEvent * );
+    void paintEvent( QPaintEvent * );
+private slots:
+    void animate();
+private:
+    QString t;
+    int     b;
+};
+
+#endif
diff --git a/examples/hello/hello.pro b/examples/hello/hello.pro
new file mode 100644
index 0000000..de15e8e
--- /dev/null
+++ b/examples/hello/hello.pro
@@ -0,0 +1,9 @@
+TEMPLATE	= app
+TARGET		= hello
+
+CONFIG		+= qt warn_on release
+DEPENDPATH	= ../../include
+
+HEADERS		= hello.h
+SOURCES		= hello.cpp \
+		  main.cpp
diff --git a/examples/hello/main.cpp b/examples/hello/main.cpp
new file mode 100644
index 0000000..7e90533
--- /dev/null
+++ b/examples/hello/main.cpp
@@ -0,0 +1,40 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 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 "hello.h"
+#include <qapplication.h>
+
+
+/*
+  The program starts here. It parses the command line and builds a message
+  string to be displayed by the Hello widget.
+*/
+
+int main( int argc, char **argv )
+{
+    QApplication a(argc,argv);
+    QString s;
+    for ( int i=1; i<argc; i++ ) {
+	s += argv[i];
+	if ( i<argc-1 )
+	    s += " ";
+    }
+    if ( s.isEmpty() )
+	s = "Hello, World";
+    Hello h( s );
+#ifndef QT_NO_WIDGET_TOPEXTRA	// for Qt/Embedded minimal build
+    h.setCaption( "Qt says hello" );
+#endif
+    QObject::connect( &h, SIGNAL(clicked()), &a, SLOT(quit()) );
+    h.setFont( QFont("times",32,QFont::Bold) );		// default font
+    h.setBackgroundColor( Qt::white );			// default bg color
+    a.setMainWidget( &h );
+    h.show();
+    return a.exec();
+}