Qt TextEdit富文本操作 笔记
下面代码包含了打开文件，拖拽文件，插入框架，文本块，表格，列表，图片，将所选内容变成斜体，添加下划线以及从后往前查找内容并高亮的功能。废话不多说，代码贴上：
头文件：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include
#include
#include
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QStatusBar *sBar;
QLabel *label;
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
源文件：
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QToolBar *toolbar=addToolBar("toolbar");
toolbar->addAction(ui->action_O);
ui->textEdit->setAcceptDrops(false);
this->setAcceptDrops(true);
sBar=statusBar();
label=new QLabel(this);
sBar->addWidget(label);
connect(ui->action_O,&QAction::triggered,
[=]()mutable
{
QString path=QFileDialog::getOpenFileName(this,
"open",
"/home",
"text files(*.txt *.c *.cpp *.h)"
);
QFile file(path);
QFileInfo fi=QFileInfo(path);
if(!file.open(QIODevice::ReadOnly|QIODevice::Text))
{
QMessageBox::warning(this,"ERROR",QString("read file error:%1").arg(file.errorString()));
}
else
{
QTextStream txtinput(&file);
QString line=txtinput.readLine();
ui->textEdit->setText("");
ui->textEdit->append(line);
while(!line.isNull())
{
line=txtinput.readLine();
ui->textEdit->append(line);
}
label->setText(fi.fileName());
}
}
);
connect(ui->action_X,&QAction::triggered,
[=]()mutable
{
QApplication *app;
app->exit();
}
);
connect(ui->action,&QAction::triggered,
[=]()mutable
{
// QTextDocument *doc = ui->textEdit->document(); //获取文档对象
// QTextFrame *rootFrame = doc->rootFrame(); //获取根框架
// QTextFrameFormat frameFormat; //创建框架格式
// frameFormat.setBorderBrush(Qt::NoBrush); //设置边界颜色
// rootFrame->setFrameFormat(frameFormat); //给根框架使用格式
QTextFrameFormat frameFormat2;
frameFormat2.setBackground(Qt::green); //设置背景色
frameFormat2.setBorderBrush(Qt::red);
frameFormat2.setMargin(5); //设置边距
frameFormat2.setPadding(5); //设置填充
frameFormat2.setBorder(1);//设置边界宽度为1
frameFormat2.setBorderStyle(QTextFrameFormat::BorderStyle_Dashed); //设置边框样式--虚线
QTextCursor cursor = ui->textEdit->textCursor(); //获取光标
cursor.insertFrame(frameFormat2); //在光标处插入框架
}
);
connect(ui->action_2,&QAction::triggered,
[=]()mutable
{
//插入文本块
QTextCursor cursor=ui->textEdit->textCursor();
QTextBlockFormat blockFormat;
blockFormat.setAlignment(Qt::AlignCenter);
cursor.insertBlock(blockFormat);
//字符格式，字符颜色
QTextCharFormat charFormat;
charFormat.setBackground(Qt::yellow);
charFormat.setForeground(Qt::red);
charFormat.setFont(QFont("宋体",13));
cursor.setCharFormat(charFormat);
cursor.insertText("新文本块");
}
);
connect(ui->action_3,&QAction::triggered,
[=]()mutable
{
QDialog *p=new QDialog;
p->setWindowTitle("表格属性框");
p->setAttribute(Qt::WA_DeleteOnClose);
p->setWindowModality(Qt::ApplicationModal);
QHBoxLayout *hboxLayout=new QHBoxLayout;
QFormLayout *formLayout=new QFormLayout;
QVBoxLayout *vboxLayout=new QVBoxLayout;
hboxLayout->addLayout(formLayout);
hboxLayout->addLayout(vboxLayout);
QLabel *rowlabel=new QLabel(this);
rowlabel->setText("行");
QLabel *columnlabel=new QLabel(this);
columnlabel->setText("列");
QLabel *marginlabel=new QLabel(this);
marginlabel->setText("外空白");//单元格与单元格之间的距离
QLabel *paddinglabel=new QLabel(this);
paddinglabel->setText("内空白");//单元格边界和内容之间的距离
QLineEdit *rowline=new QLineEdit(this);
QLineEdit *columnline=new QLineEdit(this);
QLineEdit *marginline=new QLineEdit(this);
QLineEdit *paddingline=new QLineEdit(this);
formLayout->addWidget(rowlabel);
formLayout->addWidget(rowline);
formLayout->addWidget(columnlabel);
formLayout->addWidget(columnline);
formLayout->addWidget(marginlabel);
formLayout->addWidget(marginline);
formLayout->addWidget(paddinglabel);
formLayout->addWidget(paddingline);
QPushButton *pushbuttonOK=new QPushButton(this);
pushbuttonOK->setText("确定");
QPushButton *pushbuttonCANCLE=new QPushButton(this);
pushbuttonCANCLE->setText("取消");
vboxLayout->addWidget(pushbuttonOK);
vboxLayout->addWidget(pushbuttonCANCLE);
p->setLayout(hboxLayout);
connect(pushbuttonOK,&QPushButton::released,
[=]()mutable
{
QTextCursor cursor=ui->textEdit->textCursor();
QTextTableFormat tableFormat;
tableFormat.setCellSpacing(marginline->text().toInt());
tableFormat.setCellPadding(paddingline->text().toInt());
cursor.insertTable(rowline->text().toInt(),columnline->text().toInt(),tableFormat);
}
);
connect(pushbuttonCANCLE,&QPushButton::released,p,&QDialog::close);
p->show();
}
);
connect(ui->action_4,&QAction::triggered,
[=]()mutable
{
QTextCursor cursor=ui->textEdit->textCursor();
QTextListFormat listFormat;
listFormat.setStyle(QTextListFormat::ListDecimal);
cursor.insertList(listFormat);
}
);
connect(ui->action_5,&QAction::triggered,
[=]()mutable
{
QTextCursor cursor=ui->textEdit->textCursor();
QTextImageFormat imageFormat;
QString path=QFileDialog::getOpenFileName(
this,
"open",
"/home",
"image(*.png *.jpg)"
);
imageFormat.setName(path);
cursor.insertImage(imageFormat);
}
);
QAction *italic=new QAction("斜体");
toolbar->addAction(italic);
QAction *underline=new QAction("下划线");
toolbar->addAction(underline);
QAction *search=new QAction("查找");
toolbar->addAction(search);
connect(italic,&QAction::triggered,
[=]()mutable
{
QTextCursor cursor=ui->textEdit->textCursor();
QTextCharFormat charFormat;
charFormat.setFontItalic(true);
cursor.mergeCharFormat(charFormat);
}
);
connect(underline,&QAction::triggered,
[=]()mutable
{
QTextCursor cursor=ui->textEdit->textCursor();
QTextCharFormat charFormat;
charFormat.setFontUnderline(true);
cursor.mergeCharFormat(charFormat);
}
);
connect(search,&QAction::triggered,
[=]()mutable
{
QDialog *p=new QDialog;
p->setWindowTitle("查找");
p->setAttribute(Qt::WA_DeleteOnClose);
p->setWindowModality(Qt::ApplicationModal);
QLineEdit *lineEdit=new QLineEdit;
QPushButton *pushbutton=new QPushButton;
QVBoxLayout *vboxLayout=new QVBoxLayout;
vboxLayout->addWidget(lineEdit);
vboxLayout->addWidget(pushbutton);
pushbutton->setText("查询下一个");
connect(pushbutton,&QPushButton::released,
[=]()mutable
{
QString str=lineEdit->text();
if(ui->textEdit->find(str,QTextDocument::FindBackward))//查找后一个
{
// 查找到后高亮显示
QPalette palette = ui->textEdit->palette();
palette.setColor(QPalette::Highlight,palette.color(QPalette::Active,QPalette::Highlight));
ui->textEdit->setPalette(palette);
}
else
{
QMessageBox::information(this,tr("注意"),tr("没有找到内容"),QMessageBox::Ok);
}
}
);
p->setLayout(vboxLayout);
p->show();
}
);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::dragEnterEvent(QDragEnterEvent *event)
{
if(event->mimeData()->hasFormat("text/uri-list"))
event->acceptProposedAction();
}
void MainWindow::dropEvent(QDropEvent *event)
{
QListurls=event->mimeData()->urls();
if(urls.isEmpty())
return;
QString filename1=urls.first().toLocalFile();
if(filename1.isEmpty())
return;
QFileInfo fi=QFileInfo(filename1);
QFile file(filename1);
file.open(QIODevice::ReadOnly|QIODevice::Text);
QTextStream txtinput(&file);
QString line=txtinput.readLine();
ui->textEdit->setText("");
ui->textEdit->append(line);
while(!line.isNull())
{
line=txtinput.readLine();
ui->textEdit->append(line);
}
label->setText(fi.fileName());
}