如果你在你的小部件顶部做一个覆盖,你可以制作类似于 iOS 弹出窗口的东西。
基本上,您创建另一个小部件,并将其作为您希望在其上绘制的小部件的父级。
以下是一些可以放入覆盖构造函数中的有用标志和代码行:
setPalette(Qt::transparent);
// if you have buttons on this overlay you probably don't want this one
setAttribute(Qt::WA_TransparentForMouseEvents);
QGraphicsDropShadowEffect * dse = new QGraphicsDropShadowEffect();
dse->setBlurRadius(20);
this->setGraphicsEffect(dse);
然后,请确保在父窗口小部件调整大小时命令调整覆盖层的大小:
void ParentWidget::resizeEvent(QResizeEvent *event)
{
overlay->resize(event->size());
event->accept();
}
http://www.qtcentre.org/wiki/index.php?title=Widget_Overlay
更新:很棒的例子
main.cpp
#include <QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
w.resize(300,600);
return a.exec();
}
主窗口.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "overlaydialogbox.h"
#include <QResizeEvent>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void resizeEvent(QResizeEvent *event);
private:
OverlayDialogBox * m_overlay;
};
#endif // MAINWINDOW_H
主窗口.cpp
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
m_overlay = new OverlayDialogBox(this);
}
MainWindow::~MainWindow() { }
void MainWindow::resizeEvent(QResizeEvent *event)
{
m_overlay->resize(event->size());
event->accept();
}
覆盖对话框.h
#ifndef OVERLAYDIALOGBOX_H
#define OVERLAYDIALOGBOX_H
#include <QWidget>
class OverlayDialogBox : public QWidget
{
Q_OBJECT
public:
explicit OverlayDialogBox(QWidget *parent = 0);
signals:
void accepted();
void rejected();
void finished(int);
public slots:
};
#endif // OVERLAYDIALOGBOX_H
覆盖对话框.c++
#include "overlaydialogbox.h"
#include <QGridLayout>
#include <QGraphicsEffect>
#include <QLabel>
#include <QDialogButtonBox>
#include <QMessageBox>
#include <QIcon>
OverlayDialogBox::OverlayDialogBox(QWidget *parent) :
QWidget(parent)
{
setPalette(Qt::transparent);
// if you have buttons on this overlay you probably don't want this one
// setAttribute(Qt::WA_TransparentForMouseEvents);
QGraphicsDropShadowEffect * dse = new QGraphicsDropShadowEffect();
dse->setBlurRadius(20);
this->setGraphicsEffect(dse);
QGridLayout * grid = new QGridLayout();
this->setLayout(grid);
QMessageBox * msg = new QMessageBox(QMessageBox::Warning,"Testing","This is a test QMessageBox.");
QObject::connect(msg, SIGNAL(accepted()), this, SIGNAL(accepted()));
QObject::connect(msg, SIGNAL(finished(int)), this, SIGNAL(finished(int)));
QObject::connect(msg, SIGNAL(rejected()), this, SIGNAL(rejected()));
QObject::connect(msg, SIGNAL(finished(int)), this, SLOT(close()));
msg->setPalette(Qt::white);
grid->addWidget(msg);
}
希望有帮助。