QT a simple word document editor

1. Look at the renderings first

You can set the properties of text 、 Text color 、 Font type . The following example is for reference only , Some places are still imperfect .

2. Classes that need to be used

2.1 Font selection drop-down box ：QFontComboBox.

QFontComboBox It is a combo box that allows users to select fonts . The combo box is filled with an alphabetical list of font family names .

Common methods ：

Get the current font

QFont currentFont() const

There's another signal , When the font changes , Sending signal .

void currentFontChanged(const QFont &font)

2.2 Color dialog ：QColorDialog

Common methods ：

Get the currently selected color

QColor currentColor() const

2.3QTextCharFormat

QTextCharFormat Class is QTextDocument The characters in provide formatting information . let me put it another way , We need to set the properties of the font selected by the mouse , You need to use this class .

The method used in this example ：

void setFont(const QFont &font)	Set the font
void setFontItalic(bool italic)	Set whether Italic
void setFontStrikeOut(bool strikeOut)	Set strikethrough
void setFontUnderline(bool underline)	Set underline

3. Source code

For convenience , I defined 5 Global variables

bool isBold = false;    // Is it bold 
bool isUnderLine = false; // Whether to underline 
bool isDelLine = false; // Delete line 
bool isLean = false; // Is it italicized 

QColor color(Qt::black); // The font color 

Set italics 、 Buttons such as bold can be selected , Because the default is not selectable , We need to bind selectable signals .

    ui->btnBold->setCheckable(true);
    ui->btnDelLine->setCheckable(true);
    ui->btnLean->setCheckable(true);
    ui->btnUnderline->setCheckable(true);

Signal of binding button

void clicked(bool checked = false)

#include "WTextEdit.h"
#include "ui_WTextEdit.h"
#include <QColorDialog>
#include <QTextDocument>
#include <QTextCursor>
#include <QTextCharFormat>
#include <QFont>
#include <QBrush>

bool isBold = false;    // Is it bold 
bool isUnderLine = false; // Whether to underline 
bool isDelLine = false; // Delete line 
bool isLean = false; // Is it italicized 

QColor color(Qt::black); // The font color 

WTextEdit::WTextEdit(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::WTextEdit)
{
    ui->setupUi(this);

    ui->btnBold->setCheckable(true);
    ui->btnDelLine->setCheckable(true);
    ui->btnLean->setCheckable(true);
    ui->btnUnderline->setCheckable(true);
}

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


void WTextEdit::on_btnBold_clicked(bool checked)
{
    isBold = checked;
    updateText();
}

void WTextEdit::on_btnLean_clicked(bool checked)
{
    isLean = checked;
    updateText();
}

void WTextEdit::on_btnUnderline_clicked(bool checked)
{
    isUnderLine = checked;
    updateText();
}

void WTextEdit::on_btnDelLine_clicked(bool checked)
{
    isDelLine = checked;
    updateText();
}

void WTextEdit::updateText()
{
    QFont font = ui->fontComboBox->currentFont();
    font.setBold(isBold);
    font.setPointSize(ui->lineEdit->text().toInt());

    QTextCharFormat format;
    format.setFont(font);
    format.setFontItalic(isLean);
    format.setFontStrikeOut(isDelLine);
    format.setFontUnderline(isUnderLine);

    QPen pen;
    pen.setColor(color);    // Set font color 
    format.setTextOutline(pen);

    ui->textEdit->textCursor().setCharFormat(format);
}

void WTextEdit::on_btnColor_clicked()
{
    QColorDialog dialog;
    dialog.exec();


    color = dialog.currentColor();
    updateText();
}

void WTextEdit::on_lineEdit_textChanged(const QString &arg1)
{
    updateText();
}

void WTextEdit::on_fontComboBox_currentFontChanged(const QFont &f)
{
    updateText();
}