QT学习笔记（二）

QT 第五章-5.2文本块
完整学习CODE:
1).h文件：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
   
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
   
private:
    Ui::MainWindow *ui;
private slots:
    void showTextFrame();
    void showTextBlock();
    void setTextFont(bool checked);

};

#endif // MAINWINDOW_H

2）.CPP文件：
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTextCodec>
#include <QTextFrame>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
   QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    // QT 框架的实际应用
    QTextDocument *document = ui->textEdit->document();//获取文档对象
    QTextFrame *rootFrame = document->rootFrame();//获取根框架
    QTextFrameFormat format;//创建框架格式
    format.setBorderBrush(Qt::red);//边界颜色
    format.setBorder(3);//边界宽度
    rootFrame->setFrameFormat(format);//框架使用格式

    //使用光标类对象，在根框架中再添加一个子框架
    QTextFrameFormat frameFormat;
    frameFormat.setBackground(Qt::lightGray);//设定背景颜色
    frameFormat.setMargin(10);//设定边距
    frameFormat.setPadding(5);//设定填衬
    frameFormat.setBorder(2);
    frameFormat.setBorderStyle(QTextFrameFormat::BorderStyle_Groove);
    QTextCursor cursor = ui->textEdit->textCursor();
    cursor.insertFrame(frameFormat);

    QAction *action_textFrame = new QAction(tr("框架"), this);
    connect(action_textFrame, SIGNAL(triggered()), this, SLOT(showTextFrame()));
    ui->mainToolBar->addAction(action_textFrame);//在工具栏新增动作

    QAction *action_textBlock = new QAction(tr("文本块"), this);
    connect(action_textBlock, SIGNAL(triggered()), this, SLOT(showTextBlock()));
    ui->mainToolBar->addAction(action_textBlock);

    QAction *action_font = new QAction(tr("字体"), this);
    action_font -> setCheckable(true);
    connect(action_font, SIGNAL(toggled(bool)), this, SLOT(setTextFont(bool)));
    ui->mainToolBar->addAction(action_font);


}


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

void MainWindow::showTextFrame()
{
    QTextDocument *document = ui->textEdit->document();
    QTextFrame *frame = document->rootFrame();
    QTextFrame::iterator it;
    for(it = frame->begin();!(it.atEnd()); ++it)
    {
        QTextFrame *childFrame = it.currentFrame();//获取当前框架的指针
        QTextBlock childBlock = it.currentBlock();//获取当前文本块
        if(childFrame)
        {
            qDebug()<<"frame";
        }
        else if(childBlock.isValid())
        {
            qDebug()<<"block:"<<childBlock.text();

        }
    }
}

void MainWindow::showTextBlock()
{
   QTextDocument *document = ui->textEdit->document();
   QTextBlock block = document -> firstBlock();
   for(int i = 0; i<document->blockCount(); i++)
   {
       qDebug()<<tr("文本块%1,文本块首行行号为：%2, 长度为：%3, 内容为：").arg(i).arg(block.firstLineNumber()).arg(block.length())<<block.text();
       block = block.next();
   }
}

void MainWindow::setTextFont(bool checked)
{
    QTextCursor cursor;
    QTextCharFormat charFormat;

    if(checked)
    {
        cursor = ui->textEdit->textCursor();
        QTextBlockFormat blockFormat;
        blockFormat.setAlignment(Qt::AlignCenter);
        cursor.insertBlock(blockFormat);
        charFormat.setBackground(Qt::lightGray);
        charFormat.setForeground(Qt::blue);
        //使用宋体，12号，加粗，倾斜
        charFormat.setFont(QFont(tr("宋体"), 12, QFont::Bold, true));
        charFormat.setFontUnderline(true);
        cursor.setCharFormat(charFormat);
        cursor.insertText(tr("测试字体"));
    }
    else
    {
        charFormat.setFont(QFont(tr("宋体"), 10, QFont::Black, true));
        charFormat.setFontUnderline(false);
        cursor.setCharFormat(charFormat);
        cursor.insertText(tr("测试字体"));

    }

}