实现效果：

代码：

#ifndef IMAGINIST_H

#define IMAGINIST_H

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include "ui_imaginist.h"

class imaginist : public QWidget

{

Q_OBJECT

public:

imaginist(QWidget *parent = 0);

~imaginist();

protected:

void mousePressEvent(QMouseEvent *event);

void mouseMoveEvent(QMouseEvent *event);

private:

Ui::imaginistClass ui;

QPoint Position;

QPalette pe;

QFont font;

QTimer * timer;

QSqlDatabase db;

QColor color;

QTime time;

private slots:

void showText();

};

#endif // IMAGINIST_H

#include "imaginist.h"

#include

#include

#include

#include

#include

#include

#include

#include

#include

imaginist::imaginist(QWidget *parent)

: QWidget(parent)

{

ui.setupUi(this);

font.setPointSize(30);

font.setBold(true);

ui.showLabel->setFont(font);

ui.showLabel->setWordWrap(true);

db = QSqlDatabase::addDatabase("QMYSQL");

db.setHostName("localhost");

db.setDatabaseName("muxin");

db.setUserName("root");

db.setPassword("123");

timer = new QTimer;

connect(timer, SIGNAL(timeout()), this, SLOT(showText()));

timer->start(5000);

}

imaginist::~imaginist()

{

delete timer;

timer = NULL;

db.close();

}

void imaginist::mousePressEvent(QMouseEvent *event)

{

if (event->button() == Qt::LeftButton)

{

Position = event->globalPos() - frameGeometry().topLeft();

event->accept();

}

else if (event->button() == Qt::RightButton)

{

close();

}

}

void imaginist::mouseMoveEvent(QMouseEvent *event)

{

move(event->globalPos() - Position);

event->accept();

}

void imaginist::showText()

{

time = QTime::currentTime();

qsrand(time.msec() + time.second() * 1000);

//color = QColor((qrand() % 256, qrand() % 256, qrand() % 256));

color = QColor::fromHsl(rand() % 360, rand() % 256, rand() % 200);

pe.setColor(QPalette::WindowText, color);

ui.showLabel->setPalette(pe);

QString sql = "SELECT sentence FROM muxin WHERE id = ";

int count;

if (db.open())

{

QSqlQuery query;

query.exec("SELECT COUNT(*) FROM muxin");

while (query.next())

{

count = query.value(0).toInt();

}

sql += QString::number(qrand() % count);

query.exec(sql);

while (query.next())

{

ui.showLabel->setText(query.value(0).toString());

}

}

}

#include "imaginist.h"

#include

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

imaginist w;

w.setWindowOpacity(1.0);

w.setWindowFlags(Qt::FramelessWindowHint);

w.setAttribute(Qt::WA_TranslucentBackground);

w.show();

return a.exec();

}

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2014-05-03 21:55

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