Qt QTabWidget 竖向 QTabBar横向

正常设置QTabWidget->setTabPosition(QTabWidget::West);设置完竖向之后会发现QTabBar仍然是竖向的
所以我们需要重绘一下Qtabbar 下面是重绘代码

/******************customTabStyle.h**************************/

 1 #ifndef CUSTOMTABSTYLE_H
 2 #define CUSTOMTABSTYLE_H
 3 #include <QPainter>
 4 #include <QProxyStyle>
 5 #include <QStyleOptionTab>
 6 #include <QRect>
 7 #include <QSize>
 8 class CustomTabStyle : public QProxyStyle
 9 {
10 public:
11     QSize sizeFromContents(ContentsType type, const QStyleOption *option,
12         const QSize &size, const QWidget *widget) const
13     {
14         QSize s = QProxyStyle::sizeFromContents(type, option, size, widget);
15         if (type == QStyle::CT_TabBarTab) {
16             s.transpose();
17             s.rwidth() = 150; // 设置每个tabBar中item的大小
18             s.rheight() = 50;
19         }
20         return s;
21     }
22     void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
23     {
24         if (element == CE_TabBarTabLabel) {
25             if (const QStyleOptionTab *tab = qstyleoption_cast<const QStyleOptionTab *>(option)) {
26                 QRect allRect = tab->rect;
27                 allRect.setWidth(allRect.width() - 5);
28                 allRect.setHeight(allRect.height() - 2);
29                 //选中状态
30                 if (tab->state & QStyle::State_Selected) {
31                     //save用以保护坐标，restore用来退出状态
32                     painter->save();
33                     painter->setBrush(QBrush(0x004ea1));
34                     //矩形
35                     //painter->drawRect(allRect.adjusted(0, 0, 0, 0));
36                     //带有弧线矩形
37                     painter->drawRoundedRect(tab->rect, 8, 8);
38                     painter->restore();
39                 }
40                 //hover状态
41                 else if(tab->state & QStyle::State_MouseOver){
42                     painter->save();
43                     painter->setBrush(QBrush(0x004ea1));
44                     painter->drawRoundedRect(allRect, 8, 8);
45                     painter->restore();
46                 }
47                 else{
48                     painter->save();
49                     painter->setBrush(QBrush(0x78aadc));
50                     painter->drawRoundedRect(allRect, 8, 8);
51                     painter->restore();
52                 }
53                 QTextOption option;
54                 option.setAlignment(Qt::AlignCenter);
55                 painter->setFont(QFont("楷体", 18, QFont::Bold));
56                 painter->setPen(0xffffff);
57                 painter->drawText(allRect, tab->text, option);
58                 return;
59             }
60         }
61         if (element == CE_TabBarTab) {
62             QProxyStyle::drawControl(element, option, painter, widget);
63         }
64     }
65 };

endif // CUSTOMTABSTYLE_H

/****************************引用方法*****************************/

1     QTabWidget* tab = new QTabWidget();
2     QPushButton* closeButton = new QPushButton;
3     closeButton->setObjectName("closeButton");
4     QPushButton* button = new QPushButton("button");
5     tab->addTab(closeButton, "关闭");
6     tab->addTab(button, "按钮");
7     tab->setTabPosition(QTabWidget::West);//QTabWidget竖向
8     tab->tabBar()->setStyle(new CustomTabStyle);//注意，设置上述代码风格 就可以实现QTabBar横向
9     setCentralWidget(tab);