效果
这里写图片描述
自定义标题栏
实现
头文件
title_bar.h
#ifndef TITLE_BAR
#define TITLE_BAR
#include
class QLabel;
class QPushButton;
class TitleBar : public QWidget
{
Q_OBJECT
public:
explicit TitleBar(QWidget *parent = 0);
~TitleBar();
protected:
// 双击标题栏进行界面的最大化/还原
virtual void mouseDoubleClickEvent(QMouseEvent *event);
// 进行鼠界面的拖动
virtual void mousePressEvent(QMouseEvent *event);
// 设置界面标题与图标
virtual bool eventFilter(QObject *obj, QEvent *event);
private slots:
// 进行最小化、最大化/还原、关闭操作
void onClicked();
private:
// 最大化/还原
void updateMaximize();
private:
QLabel *m_pIconLabel;
QLabel *m_pTitleLabel;
QPushButton *m_pMinimizeButton;
QPushButton *m_pMaximizeButton;
QPushButton *m_pCloseButton;
};
#endif // TITLE_BAR
cpp文件
title_bar.cpp
#include
#include
#include
#include
#include
#include
#include "title_bar.h"
#ifdef Q_OS_WIN
#pragma comment(lib, "user32.lib")
#include
#endif
TitleBar::TitleBar(QWidget *parent)
: QWidget(parent)
{
setFixedHeight(30);
m_pIconLabel = new QLabel(this);
m_pTitleLabel = new QLabel(this);
m_pMinimizeButton = new QPushButton(this);
m_pMaximizeButton = new QPushButton(this);
m_pCloseButton = new QPushButton(this);
m_pIconLabel->setFixedSize(20, 20);
m_pIconLabel->setScaledContents(true);
m_pTitleLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
m_pMinimizeButton->setFixedSize(27, 22);
m_pMaximizeButton->setFixedSize(27, 22);
m_pCloseButton->setFixedSize(27, 22);
m_pTitleLabel->setObjectName("whiteLabel");
m_pMinimizeButton->setObjectName("minimizeButton");
m_pMaximizeButton->setObjectName("maximizeButton");
m_pCloseButton->setObjectName("closeButton");
m_pMinimizeButton->setToolTip("Minimize");
m_pMaximizeButton->setToolTip("Maximize");
m_pCloseButton->setToolTip("Close");
QHBoxLayout *pLayout = new QHBoxLayout(this);
pLayout->addWidget(m_pIconLabel);
pLayout->addSpacing(5);
pLayout->addWidget(m_pTitleLabel);
pLayout->addWidget(m_pMinimizeButton);
pLayout->addWidget(m_pMaximizeButton);
pLayout->addWidget(m_pCloseButton);
pLayout->setSpacing(0);
pLayout->setContentsMargins(5, 0, 5, 0);
setLayout(pLayout);
connect(m_pMinimizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
connect(m_pMaximizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
connect(m_pCloseButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
}
TitleBar::~TitleBar()
{
}
void TitleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
Q_UNUSED(event);
emit m_pMaximizeButton->clicked();
}
void TitleBar::mousePressEvent(QMouseEvent *event)
{
#ifdef Q_OS_WIN
if (ReleaseCapture())
{
QWidget *pWindow = this->window();
if (pWindow->isTopLevel())
{
SendMessage(HWND(pWindow->winId()), WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}
}
event->ignore();
#else
#endif
}
bool TitleBar::eventFilter(QObject *obj, QEvent *event)
{
switch (event->type())
{
case QEvent::WindowTitleChange:
{
QWidget *pWidget = qobject_cast(obj);
if (pWidget)
{
m_pTitleLabel->setText(pWidget->windowTitle());
return true;
}
}
case QEvent::WindowIconChange:
{
QWidget *pWidget = qobject_cast(obj);
if (pWidget)
{
QIcon icon = pWidget->windowIcon();
m_pIconLabel->setPixmap(icon.pixmap(m_pIconLabel->size()));
return true;
}
}
case QEvent::WindowStateChange:
case QEvent::Resize:
updateMaximize();
return true;
}
return QWidget::eventFilter(obj, event);
}
void TitleBar::onClicked()
{
QPushButton *pButton = qobject_cast(sender());
QWidget *pWindow = this->window();
if (pWindow->isTopLevel())
{
if (pButton == m_pMinimizeButton)
{
pWindow->showMinimized();
}
else if (pButton == m_pMaximizeButton)
{
pWindow->isMaximized() ? pWindow->showNormal() : pWindow->showMaximized();
}
else if (pButton == m_pCloseButton)
{
pWindow->close();
}
}
}
void TitleBar::updateMaximize()
{
QWidget *pWindow = this->window();
if (pWindow->isTopLevel())
{
bool bMaximize = pWindow->isMaximized();
if (bMaximize)
{
m_pMaximizeButton->setToolTip(tr("Restore"));
m_pMaximizeButton->setProperty("maximizeProperty", "restore");
}
else
{
m_pMaximizeButton->setProperty("maximizeProperty", "maximize");
m_pMaximizeButton->setToolTip(tr("Maximize"));
}
m_pMaximizeButton->setStyle(QApplication::style());
}
}
接口说明
mousePressEvent
之前,我们将界面移动的事件写在主界面里面,这会有一个问题,一般情况下,是界面随着标题栏的移动而移动,而并非界面中的所有位置都可以进行拖动,所以我们将事件写在标题栏中比较合理。
mouseDoubleClickEvent
双击标题栏会进行窗体的最大化/还原,所以我们需要重写此事件进行控制。
eventFilter
事件过滤器,这里被监听的窗体为标题栏所在的窗体,所以当窗体标题、图标等信息发生改变时,标题栏也应该随之改变。
最好不要通过直接调用接口的形式来操作对应的行为,比如:TitleBar中定义一个public函数来专门修改标题与图标,这样会造成不必要的麻烦,因为Qt本身就是基于事件的,所以此处采用过滤器的方式。
updateMaximize
因为窗体大小发生变化的时候,最大化的图标、提示应该对应的发生变化,所以在eventFilter中事件触发时调用。
使用方式
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
setWindowFlags(Qt::FramelessWindowHint | windowFlags());
TitleBar *pTitleBar = new TitleBar(this);
installEventFilter(pTitleBar);
resize(400, 300);
setWindowTitle("Custom Window");
setWindowIcon(QIcon(":/Images/logo"));
QPalette pal(palette());
pal.setColor(QPalette::Background, QColor(50, 50, 50));
setAutoFillBackground(true);
setPalette(pal);
QVBoxLayout *pLayout = new QVBoxLayout();
pLayout->addWidget(pTitleBar);
pLayout->addStretch();
pLayout->setSpacing(0);
pLayout->setContentsMargins(0, 0, 0, 0);
setLayout(pLayout);
}
注意
installEventFilter必须在setWindowTitle、setWindowIcon之前调用,因为必须先安装事件过滤器,相应事件触发时,才会进入标题栏的eventFilter事件中。