QSS之QScrollArea

QScrollArea在实际的开发过程中经常使用，主要是有些界面一屏显示不下，所以得用QScorllArea带滚动条拖动显示剩余的界面。默认的QScrollArea滚动条不满设计的风格，因此我们必须设置自已的滚动条风格，QScrollBar分为水平horizontal和垂直vertical，在设置的过程中常见的属性如下：

首先看垂直滚动条属性：

属性	意思
QScrollBar:vertical	垂直滚动条整体背景风格
QScrollBar::handle:vertical	垂直滚动条滑动块风格
QScrollBar::add-line:vertical	垂直滚动条底部添加一个按钮
QScrollBar::sub-line:vertical	垂直滚动条覆盖顶部的按钮
QScrollBar:up-arrow:vertical	垂直滚动条顶边按钮上的箭头
QScrollBar:down-arrow:vertical	垂直滚动条底部按钮上的箭头
QScrollBar::add-page:vertical	垂直滚动条滑动块下边区域的风格
QScrollBar::sub-page:vertical	垂直滚动条滑动块上边区域的风格

水平滚动条属性

下面看具体的代码示例：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

    void initView();
    void initData();


private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp文件：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPalette>
#include <QScrollArea>
#include <QScrollBar>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->resize(1000, 500);
    initView();
    initData();
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::initView()
{
    //给父窗体填充颜色
    QPalette palette = ui->scrollAreaWidgetContents->palette();
    palette.setBrush(QPalette::Window, QBrush(QColor(0, 0, 60)));
    ui->scrollAreaWidgetContents->setAutoFillBackground(true);
    ui->scrollAreaWidgetContents->setPalette(palette);
    QPalette palette2 = ui->scrollAreaWidgetContents_2->palette();
    palette2.setBrush(QPalette::Window, QBrush(QColor(0, 60, 0)));
    ui->scrollAreaWidgetContents_2->setAutoFillBackground(true);
    ui->scrollAreaWidgetContents_2->setPalette(palette2);
    QPalette palette3 = ui->scrollAreaWidgetContents_3->palette();
    palette3.setBrush(QPalette::Window, QBrush(QColor(60, 0, 0)));
    ui->scrollAreaWidgetContents_3->setAutoFillBackground(true);
    ui->scrollAreaWidgetContents_3->setPalette(palette3);
    QPalette palette4 = ui->scrollAreaWidgetContents_4->palette();
    palette4.setBrush(QPalette::Window, QBrush(QColor(60, 60, 0)));
    ui->scrollAreaWidgetContents_4->setAutoFillBackground(true);
    ui->scrollAreaWidgetContents_4->setPalette(palette4);
    //这里注意，要比主窗体的尺寸要大，不然太小的话会留下一片空白
    ui->scrollAreaWidgetContents->setMinimumSize(1500, 1000);
    ui->scrollAreaWidgetContents_2->setMinimumSize(1500, 1000);
    ui->scrollAreaWidgetContents_3->setMinimumSize(1500, 1000);
    ui->scrollAreaWidgetContents_4->setMinimumSize(1500, 1000);
    ui->scrollAreaWidgetContents_5->setMinimumSize(1500, 1000);
}

void MainWindow::initData()
{
    //水平滚动条风格 边距顺序margin: top right bottom left
    QString horizontalStyle = QString(
                "QScrollBar:horizontal{border:2px solid grey;background:#32CC99;height:15px;margin:0px 20px 0px 20px;}"                                     //滚动条底部背景风格
                "QScrollBar::handle:horizontal{background:yellow; min-width:20px;}"                                                                         //滑动块风格
                "QScrollBar::add-line:horizontal{border:2px solid red;background:#325599;width:20px;subcontrol-position:right;subcontrol-origin:margin;}"   //右边添加一个按钮
                "QScrollBar::sub-line:horizontal{border:2px solid blue;background:#003290;width:20px;subcontrol-position:left;subcontrol-origin:margin;}"   //覆盖左边的按钮
                "QScrollBar:left-arrow:horizontal{border:2px solid green; width 3px; height 3px; background: white;}"                                       //左边按钮上的箭头
                "QScrollBar:right-arrow:horizontal{border:2px solid green; width 3px; height 3px; background: white;}"                                      //右边按钮上的箭头
                "QScrollBar::add-page:horizontal{background:gray;}"                                                                                         //滑动块右边区域的风格
                "QScrollBar::sub-page:horizontal{background:cyan;}"                                                                                         //滑动块左边区域的风格
                );
    ui->scrollArea->horizontalScrollBar()->setStyleSheet(horizontalStyle);
    QString horizontalStyle2 = QString(
                "QScrollBar:horizontal{border:2px solid grey;background:#32CC99;height:15px;margin:0px 20px 0px 20px;}"                                     //滚动条底部背景风格
                "QScrollBar::handle:horizontal{background:yellow; min-width:20px;}"                                                                         //滑动块风格
                "QScrollBar::add-line:horizontal{border:2px solid red;background:#325599;width:20px;subcontrol-position:right;subcontrol-origin:margin;}"   //右边添加一个按钮
                "QScrollBar::sub-line:horizontal{border:2px solid blue;background:#003290;width:20px;subcontrol-position:left;subcontrol-origin:margin;}"   //覆盖左边的按钮
                "QScrollBar:left-arrow:horizontal{border:none; background: none;color:none;}"  //隐藏左边的箭头                                     //左边按钮上的箭头
                "QScrollBar:right-arrow:horizontal{border:none; background: none;color:none;}"  //隐藏右边的箭头                                    //右边按钮上的箭头
                "QScrollBar::add-page:horizontal{background:gray;}"                                                                                         //滑动块右边区域的风格
                "QScrollBar::sub-page:horizontal{background:cyan;}"                                                                                         //滑动块左边区域的风格
                );

    ui->scrollArea_2->horizontalScrollBar()->setStyleSheet(horizontalStyle2);

    //设置滑动块圆角时，border-radius的值要小于height的二分之一才有效果
    QString horizontalStyle3 = QString(
                "QScrollBar:horizontal{background:white;height:8px;}"           //滚动条底部背景风格
                "QScrollBar::handle:horizontal{background:#AAAAAA;min-width:20px;height:4px;border-radius:2px;margin:2px 0px 2px 0px;}"
                "QScrollBar::handle:horizontal:hover{background:#999999;height:8px;border-radius:3px;margin:0px;}"
                "QScrollBar::add-line:horizontal{width:0;height:0;}"            //隐藏左端的按钮                                                                                       //滑动块右边区域的风格
                "QScrollBar::sub-line:horizontal{width:0;height:0;}"            //隐藏右端的按钮                                                                                       //滑动块左边区域的风格
                );

    ui->scrollArea_3->horizontalScrollBar()->setStyleSheet(horizontalStyle3);


    //垂直滚动条风格
    QString verticalStyle = QString(
                "QScrollBar:vertical{border:2px solid grey;background:#32CC99;width:15px;margin:22px 0 22px 0;}"                                            //滚动条底部背景风格
                "QScrollBar::handle:vertical{background:yellow; min-height:20px;}"                                                                          //滑动块风格
                "QScrollBar::add-line:vertical{border:2px solid red;background:#325599;height:20px;subcontrol-position:bottom;subcontrol-origin:margin;}"   //底部添加一个按钮
                "QScrollBar::sub-line:vertical{border:2px solid blue;background:#003290;height:20px;subcontrol-position:top;subcontrol-origin:margin;}"     //覆盖顶部的按钮
                "QScrollBar:up-arrow:vertical{border:2px solid green; width 3px; height 3px; background: white;}"                                           //上边按钮上的箭头
                "QScrollBar:down-arrow:vertical{border:2px solid green; width 3px; height 3px; background: white;}"                                         //下边按钮上的箭头
                "QScrollBar::add-page:vertical{background:gray;}"                                                                                           //滑动块下边区域的风格
                "QScrollBar::sub-page:vertical{background:cyan;}"                                                                                           //滑动块上边区域的风格
                );
    ui->scrollArea->verticalScrollBar()->setStyleSheet(verticalStyle);

    QString verticalStyle2 = QString(
                "QScrollBar:vertical{border:2px solid grey;background:#32CC99;width:15px;margin:22px 0 22px 0;}"                                            //滚动条底部背景风格
                "QScrollBar::handle:vertical{background:yellow; min-height:20px;}"                                                                          //滑动块风格
                "QScrollBar::add-line:vertical{border:2px solid red;background:#325599;height:20px;subcontrol-position:bottom;subcontrol-origin:margin;}"   //底部添加一个按钮
                "QScrollBar::sub-line:vertical{border:2px solid blue;background:#003290;height:20px;subcontrol-position:top;subcontrol-origin:margin;}"     //覆盖顶部的按钮
                "QScrollBar:up-arrow:vertical{border:2px solid green; width 3px; height 3px; background: white;}"                                           //上边按钮上的箭头
                "QScrollBar:down-arrow:vertical{border:2px solid green; width 3px; height 3px; background: white;}"                                         //下边按钮上的箭头
                "QScrollBar::add-page:vertical{background:gray;}"                                                                                           //滑动块下边区域的风格
                "QScrollBar::sub-page:vertical{background:cyan;}"                                                                                           //滑动块上边区域的风格
                );
    ui->scrollArea_2->verticalScrollBar()->setStyleSheet(verticalStyle2);

    //设置滑动块圆角时，border-radius的值要小于width的二分之一才有效果
    QString verticalStyle3 = QString(
                "QScrollBar:vertical{background:white;width:8px;}"              //滚动条底部背景风格
                "QScrollBar::handle:vertical{background:#AAAAAA;min-height:20px;width:4px;border-radius:2px;margin:0px 2px 0px 2px;}"
                "QScrollBar::handle:vertical:hover{background:#999999;width:8px;border-radius:3px;margin:0px;}"
                "QScrollBar::add-line:vertical{width:0;height:0;}"              //隐藏左端的按钮                                                                                       //滑动块右边区域的风格
                "QScrollBar::sub-line:vertical{width:0;height:0;}"              //隐藏右端的按钮                                                                                       //滑动块左边区域的风格
                );
    ui->scrollArea_3->verticalScrollBar()->setStyleSheet(verticalStyle3);       //设置滚动条属性
    ui->scrollArea_3->setStyleSheet("QScrollArea{background-color:white;border:0px solid white;}");//设置QScrollArea边框属性
    
}

运行结果：