Qt --- 显示相关设置窗口属性等

主界面，窗口最小化最大化关闭按钮、显示状态自定义：

setWindowFlags(Qt::CustomizeWindowHint);
setWindowFlags(Qt::WindowCloseButtonHint); //只要关闭按钮
setWindowFlags(Qt::WindowFlags type)
Qt::FrameWindowHint:没有边框的窗口
Qt::WindowStaysOnTopHint:  //总在最上面的窗口
Qt::CustomizeWindowHint:  //自定义窗口标题栏,以下标志必须与这个标志一起使用才有效,否则窗口将有默认的标题栏
Qt::WindowTitleHint  //显示窗口标题栏
Qt::WindowSystemMenuHint  //显示系统菜单
Qt::WindowMinimizeButtonHint  //显示最小化按钮
Qt::WindowMaximizeButtonHint  //显示最大化按钮
Qt::WindowMinMaxButtonsHint  //显示最小化按钮和最大化按钮
Qt::WindowCloseButtonHint  //显示关闭按钮

隐藏任务栏显示

setWindowFlags(Qt::Tool | Qt::X11BypassWindowManagerHint）

关闭按钮实现功能：

hide(); //进行界面隐藏，但是显示托盘，可通过点击托盘实现界面的重新显示
quit(); //退出系统

绘制背景图片并且实现圆角效果

void paintEvent(QPaintEvent *)
{QPainter painter(this);QBrush brush;brush.setTextureImage(QImage(background_image)); //背景图片painter.setBrush(brush);painter.setPen(Qt::black);  //边框色painter.drawRoundedRect(this->rect(), 5, 5); //圆角5像素
}

设置应用程序的字体

QFont font("Courier", 10, QFont::Normal, false);
QApplication::setFont(font);

设置字体

QFont font = this->font();
font.setFamily("Courier");  //字体名称
font.setPixelSize(16);  //字体点大小
font.setPointSize(18);  //字体像素大小
font.setBold(true);  //是否加粗
font.setItalic(true);  //是否斜体
font.setUnderline(true);  //是否下划线
this->setFont(font);
//字体风格，包括类型、大小、是否加粗、是否斜体等！
//也可使用：setStyleSheet("text-align:center; font-size:18px; font-weight:bold; font-style:Courier; color:white; ");
setAlignment(Qt::AlignCenter);  //设置对齐方式

超链接

    QLabel *pLabel = new QLabel(this);pLabel->setText(QStringLiteral("超链接"));pLabel->setFixedSize(200,100);connect(pLabel,SIGNAL(linkActivated(QString)),this,SLOT(openUrl(QString)));QDesktopServices::openUrl(QUrl(url));  //openUrl槽里面实现pLabel->setOpenExternalLinks(true);pLabel->setText("新浪");

打开本地文件（夹）

QDesktopServices::openUrl(QUrl::fromLocalFile(local_file));

显示窗口并激活/提升

showNormal();
raise();
activateWindow();

设置滚动条值

pTextEdit->verticalScrollBar()->setValue(0);  //滚动到最顶层
pTextEdit->verticalScrollBar()->setValue(pTextEdit->verticalScrollBar()->maximum());  //滚动到最底层

QToolBar添加拉伸（弹簧）原以为QToolBar可以通过addStretch()来实现，不想没有此接口，则可通过下来方式实现：

QWidget *pWidget = new QWidget(this);
pWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed); 
pToolBar->addWidget(pWidget);

QProgressBar进度条设置文本、样式

QProgressBar *pProgressBar = new QProgressBar(this);
pProgressBar->setFixedSize(150, 10);
pProgressBar->setToolTip(QStringLiteral("离下一等级还需要1500经验"));
pProgressBar->setFormat("12345/50000");
pProgressBar->setMaximum(100);
pProgressBar->setValue(10);QString strQSS = "QProgressBar {color: white;} \QProgressBar:horizontal { \text-align: center; \border: 1px solid rgb(115, 200, 60); \background: rgb(145, 210, 75, 150); \} \
QProgressBar::chunk:horizontal { \background: rgb(145, 210, 75); \
}";pProgressBar->setStyleSheet(strQSS);

全屏显示与还原

showFullScreen()
showMaximized() 这两个都可以！

不遮挡任务栏

void showMaximize()
{//若已经最大化if(is_max){//恢复界面位置，并设置按钮图标为最大化图标，提示“最大化”this->setGeometry(location);max_button->setIcon(QIcon("maxbtn"));max_button->setToolTip(tr("max"));} else {//设定当前界面的位置，还原时使用location = this->geometry();//获取桌面位置，设置为最大化，并设置按钮图标为还原图标，提示“还原”QDesktopWidget *desk = QApplication::desktop();this->setGeometry(desk->availableGeometry());max_button->setIcon(QIcon("restorbtn"));max_button->setToolTip(tr("restor"));}is_max = !is_max;
}

注：窗口既然可以最大化，当然还要进行还原，is_max为一个bool值变量，表示窗口是否最大化，初始值为false。location为桌面的位置，每次最大化开始先记录当前的位置，等待还原时候使用。

QSS样式

QComboBox：

    comboBox->setStyleSheet("QComboBox{border:1px solid gray;}""QComboBox QAbstractItemView::item{height:25px;}""QComboBox::down-arrow{image:url(:/icon/arrowdown);}""QComboBox::drop-down{border:0px;}");comboBox->setView(new QListView());

QSpinBox

    pSpinBox->setStyleSheet("QSpinBox{border:1px solid gray;}""QSpinBox::up-button{image:url(:/icon/arrow_up);}""QSpinBox::down-button{image:url(:/icon/arrow_down);}");

QMenu

QMenu{padding:5px;background:white;border:1px solid gray;}
QMenu::item{padding:0px 40px 0px 30px;height:25px;
}
QMenu::item:selected:enabled{background:lightgray;color:white;
}
QMenu::item:selected:!enabled{background:transparent;
}
QMenu::separator{height:1px;background:lightgray;margin:5px 0px 5px 0px;
}

QSlider

QSlider::groove:horizontal{border:0px;height:4px;
}  
QSlider::sub-page:horizontal{background:white;
}  
QSlider::add-page:horizontal{background:lightgray;
} 
QSlider::handle:horizontal{background:white;width:10px;border-radius:5px;margin:-3px 0px -3px 0px;
}

QCheckBox

QCheckBox{spacing: 2px; 
}
QCheckBox::indicator {width: 20px;height: 20px;
}
QCheckBox::indicator:unchecked {image: url(:/login/checkbox);
}
QCheckBox::indicator:unchecked:hover {image: url(:/login/checkbox_hover);
}
QCheckBox::indicator:unchecked:pressed {image: url(:/login/checkbox_press);
}
QCheckBox::indicator:checked {image: url(:/login/checkbox_selected);
}
QCheckBox::indicator:checked:hover {image: url(:/login/checkbox_selected_hover);
}
QCheckBox::indicator:checked:pressed {image: url(:/login/checkbox_selected_press);
}

QScrollBar

水平滚动条 
QScrollBar:horizontal { max-height: 9px;background: transparent;padding-left: 9px;padding-right: 9px;
}
QScrollBar::handle:horizontal {height: 9px;min-width: 20px;background: rgb(190, 190, 190);
}
QScrollBar::handle:horizontal:hover {background: rgb(170, 170, 170);
}
QScrollBar::sub-line:horizontal {height: 9px;width: 9px;background: rgb(220, 220, 220);border-image: url(:/CalcSetting/ArrowLeft);subcontrol-position: left;
}
QScrollBar::add-line:horizontal {height: 9px;width: 9px;background: rgb(220, 220, 220);border-image: url(:/CalcSetting/ArrowRight);subcontrol-position: right;
}
QScrollBar::sub-line:horizontal:hover {background: rgb(190, 190, 190);border-image: url(:/CalcSetting/ArrowLeftHover);
}
QScrollBar::add-line:horizontal:hover {background: rgb(190, 190, 190);border-image: url(:/CalcSetting/ArrowRightHover);
}
QScrollBar::add-page:horizontal,QScrollBar::sub-page:horizontal {background: rgb(220, 220, 220);
}垂直滚动条 
QScrollBar:vertical {max-width: 9px;background: transparent;padding-top: 9px;padding-bottom: 9px;
}
QScrollBar::handle:vertical {width: 9px;min-height: 20px;background: rgb(190, 190, 190);
} 
QScrollBar::handle:vertical:hover {background: rgb(170, 170, 170);
} 
QScrollBar::sub-line:vertical {height: 9px;width: 9px;background: rgb(220, 220, 220);border-image: url(:/CalcSetting/ArrowTop);subcontrol-position: top;
} 
QScrollBar::add-line:vertical {height: 9px;width: 9px;background: rgb(220, 220, 220);border-image: url(:/CalcSetting/ArrowBottom);subcontrol-position: bottom;
} 
QScrollBar::sub-line:vertical:hover {background: rgb(190, 190, 190);border-image: url(:/CalcSetting/ArrowTopHover);
}
QScrollBar::add-line:vertical:hover {background: rgb(190, 190, 190);border-image: url(:/CalcSetting/ArrowBottomHover);
}
QScrollBar::add-page:vertical,QScrollBar::sub-page:vertical {background: rgb(220, 220, 220);
}

QStatusBar

QStatusBar::item{border: 0px;
}
//不存在分隔线

QComboBox

QComboBox {border-image: url(:/OverdraftControl/comboBox);
}
QComboBox:hover {border-image: url(:/OverdraftControl/comboBoxHover);
}
QComboBox:pressed {border-image: url(:/OverdraftControl/comboBoxPressed);
}
QComboBox::down-arrow {image: none;
}
QComboBox::drop-down {width: 15px;border: none;
}
QComboBox QAbstractItemView {border: 1px solid lightgray;outline: 0px;  //去掉item虚线
}
QComboBox QAbstractItemView::item {color: black;height: 22px;border: 1px solid transparent;
}
QComboBox QAbstractItemView::item:selected {border: 1px solid rgb(170, 190, 230);background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 rgb(230, 240, 250), stop: 0.5 rgb(220, 235, 255), stop: 1.0 rgb(210, 230, 255));
}

一般也可以使用QPalette

    QPalette palette;  palette.setBrush(QPalette::WindowText, QBrush(Qt::white));  pCheckBox->setPalette(palette);  pCheckBox->setStyleSheet("color:white");

调色板类QPalette提供了颜色角色（color roles）的概念，指当前界面中颜色的职责，通过枚举变量QPalette::ColorRole来定义，比较常用的角色有：

    QPalette::Window  通常指窗口部件背景色QPalette::WindowText  通常指窗口部件的前景色QPalette::Base  指文本的背景色（QTextEdit、QLineEdit等）QPalette::Text  与QPalette::Base一块使用，指文本输入窗口部件前景色QPalette::Button   指按钮窗口部件的背景色QPalette::ButtonText  指按钮窗口部件的前景色