QT透明显示文字

实现效果：

代码：

#ifndef IMAGINIST_H

#define IMAGINIST_H

#include <QtWidgets/QWidget>

#include <QtWidgets/QLabel>

#include <QtCore/QPoint>

#include <QtSql/QSqlDatabase>

#include <QtSql/QSqlQuery>

#include <QtSql/QSql>

#include <QPalette>

#include <QColor>

#include <QFont>

#include <QTimer>

#include <QTime>

#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 <QLabel>

#include <QPalette>

#include <QColor>

#include <QMouseEvent>

#include <QtSql/QSqlDatabase>

#include <QtSql/QSqlQuery>

#include <QtSql/QSql>

#include <QTimer>

#include <QTime>

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 <QtWidgets/QApplication>

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();

}