#include "widget.h"
#include "ui_widget.h"
#include <QDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //设置行列 4*4
    ui->tableWidget->setColumnCount(4);
    ui->tableWidget->setRowCount(4);
    //设置表格水平头，各列均匀分布
    ui->tableWidget->horizontalHeader()->setSectionResizeMode( QHeaderView::Stretch );
    //新建表格条目
    for(int i=0; i<4; i++)
    {
        for(int j=0; j<4; j++)
        {
            //新建条目，并根据行号、列号设置文本
            QTableWidgetItem *itemNew = new QTableWidgetItem();
            itemNew->setText( tr("tableItem %1, %2").arg(i).arg(j) );
            ui->tableWidget->setItem( i, j, itemNew );
        }
    }
    //构建完毕
}

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

//本例子都用类名和大括号包住里面的内容
void Widget::on_pushButtonAlternatingRowColors_clicked()
{
    //启用双色交替行显示
    ui->tableWidget->setAlternatingRowColors( true );
    //定制样式表，交替行采用天蓝色，表格的网格线用深绿色
    QString strStyle = " QTableWidget{ alternate-background-color: skyblue; "
                    "gridline-color: darkgreen; } " ;
    //添加给表格控件，旧的样式表保留
    ui->tableWidget->setStyleSheet( ui->tableWidget->styleSheet() + strStyle );
}

void Widget::on_pushButtonSelectionCustom_clicked()
{
    //selection-color 是选中条目的前景色
    //selection-background-color 是选中条目的背景色
    QString strStyle = " QTableWidget{ selection-color: red; "
            "selection-background-color: yellow; } ";
    //添加给表格控件，旧的样式表保留
    ui->tableWidget->setStyleSheet( ui->tableWidget->styleSheet() + strStyle );
    //设置当前条目为高亮色
    QTableWidgetItem *curItem = ui->tableWidget->currentItem();
    if(NULL != curItem)
    {
        curItem->setSelected(true); //标上选中的高亮色
    }
}

void Widget::on_pushButtonItemCustom_clicked()
{
    // QTableWidget::item 就是所有条目的样式表配置
    // color 是前景色，background-color 是背景色
    QString strStyle = " QTableWidget::item{ "
            "color: blue; "
            "background-color: lightgreen; "
            "} " ;
    //设置给表格控件，QTableWidget::item 样式表与前面两个函数的样式表冲突
    ui->tableWidget->setStyleSheet( ui->tableWidget->styleSheet() + strStyle );
}

void Widget::on_pushButtonCornerButtonCustom_clicked()
{
    // QTableCornerButton::section 就是设置表格左上角的按钮风格
    QString strStyle =  " QTableCornerButton::section{ "
       " background: green;  "
       " border: 2px outset green; "
       "} " ;
    //添加给表格控件，旧的样式表保留
    ui->tableWidget->setStyleSheet( ui->tableWidget->styleSheet() + strStyle );
}

void Widget::on_pushButtonHeaderCustom_clicked()
{
    //QHeaderView 就是表头的类，定制该类的样式表
    //前景色背景色的一般都是 color  和 background-color
    QString strStyle = " QHeaderView{ "
            "color: darkblue; "
            "background-color: cyan; "
            "} " ;
    //添加给表格控件，旧的样式表保留
    ui->tableWidget->setStyleSheet( ui->tableWidget->styleSheet() + strStyle );
}

void Widget::on_pushButtonClearStyle_clicked()
{
    //打印旧的样式表信息
    qDebug()<<"old style sheets: \r\n"<<ui->tableWidget->styleSheet()<<endl;
    //置空样式表
    ui->tableWidget->setStyleSheet("");
    //取消双色交替行的显示
    ui->tableWidget->setAlternatingRowColors( false );
}