qt.cpp

这个程序旨在实现在Qt下的图形界面应用

#include "hello.h"
#include <qlayout.h>
#include <qvariant.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qpushbutton.h>
#include <qtimer.h>
#include <qpainter.h>
#include <qpixmap.h>
/*
* Constructs a Hello which is a child of 'parent', with the
* name 'name' and widget flags set to 'f'
*/
Hello::Hello( QWidget* parent, const char* name, WFlags fl )
: QWidget( parent, name, fl )
{
if ( !name )
setName( "Hello" );
resize( 240, 320 );
setMinimumSize( QSize( 240, 320 ) );
setMaximumSize( QSize( 240, 320 ) );
setSizeIncrement( QSize( 240, 320 ) );
setBaseSize( QSize( 240, 320 ) );
QPalette pal;
QColorGroup cg;
cg.setColor( QColorGroup::Foreground, black );
cg.setColor( QColorGroup::Button, QColor( 192, 192, 192) );
cg.setColor( QColorGroup::Light, white );
cg.setColor( QColorGroup::Midlight, QColor( 223, 223, 223) );
cg.setColor( QColorGroup::Dark, QColor( 96, 96, 96) );
cg.setColor( QColorGroup::Mid, QColor( 128, 128, 128) );
cg.setColor( QColorGroup::Text, black );
cg.setColor( QColorGroup::BrightText, white );
cg.setColor( QColorGroup::ButtonText, black );
cg.setColor( QColorGroup::Base, white );
cg.setColor( QColorGroup::Background, white );
cg.setColor( QColorGroup::Shadow, black );
cg.setColor( QColorGroup::Highlight, black );
cg.setColor( QColorGroup::HighlightedText, white );
pal.setActive( cg );
cg.setColor( QColorGroup::Foreground, black );
cg.setColor( QColorGroup::Button, QColor( 192, 192, 192) );
cg.setColor( QColorGroup::Light, white );
cg.setColor( QColorGroup::Midlight, QColor( 220, 220, 220) );
cg.setColor( QColorGroup::Dark, QColor( 96, 96, 96) );
cg.setColor( QColorGroup::Mid, QColor( 128, 128, 128) );
cg.setColor( QColorGroup::Text, black );
cg.setColor( QColorGroup::BrightText, white );
cg.setColor( QColorGroup::ButtonText, black );
cg.setColor( QColorGroup::Base, white );
cg.setColor( QColorGroup::Background, white );
cg.setColor( QColorGroup::Shadow, black );
cg.setColor( QColorGroup::Highlight, black );
cg.setColor( QColorGroup::HighlightedText, white );
pal.setInactive( cg );
cg.setColor( QColorGroup::Foreground, QColor( 128, 128, 128) );
cg.setColor( QColorGroup::Button, QColor( 192, 192, 192) );
cg.setColor( QColorGroup::Light, white );
cg.setColor( QColorGroup::Midlight, QColor( 220, 220, 220) );
cg.setColor( QColorGroup::Dark, QColor( 96, 96, 96) );
cg.setColor( QColorGroup::Mid, QColor( 128, 128, 128) );
cg.setColor( QColorGroup::Text, black );
cg.setColor( QColorGroup::BrightText, white );
cg.setColor( QColorGroup::ButtonText, QColor( 128, 128, 128) );
cg.setColor( QColorGroup::Base, white );
cg.setColor( QColorGroup::Background, white );
cg.setColor( QColorGroup::Shadow, black );
cg.setColor( QColorGroup::Highlight, black );
cg.setColor( QColorGroup::HighlightedText, white );
pal.setDisabled( cg );
setPalette( pal );
QFont f( font() );
f.setFamily( "adobe-helvetica" );
f.setPointSize( 29 );
f.setBold( TRUE );
setFont( f );
setCaption( tr( "" ) );
//以下是手动添加的代码
t = "Hello,World";
b = 0;
QTimer *timer = new QTimer(this);
connect( timer, SIGNAL(timeout()), SLOT(animate()) );
timer->start( 40 );
}
/*
* Destroys the object and frees any allocated resources
*/
Hello::~Hello()
{
}
/*
This private slot is called each time the timer fires.
*/
//以下至结尾是手动添加的代码
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 );
}