qt(4)QLineEdit之文本不被选中

来源：互联网发布：华宝证券软件下载编辑：程序博客网时间：2024/05/29 08:45

http://blog.sina.com.cn/s/blog_a6fb6cc90101b3b8.html

转自上面，分析得很到位。

文本被选中状态有以下几种情况:

1、全选（Ctrl+A）

2、鼠标双击（频繁点击）

3、Shift + Home 组合键

4、Shift + End 组合键

5、Shift + 鼠标点击

6、Tab键切换

7、左、右键

。。。

8，鼠标右键

void PwdLineEdit::contextMenuEvent(QContextMenuEvent *event){    if(event->reason()== QContextMenuEvent::Mouse)    {        focusPreviousChild();        return;    }}

涉及的知识点：

1，qt自定义部件，然后在qtdesigner中把对应的部件提升下，

2，重写一些部件的事件函数

void PwdLineEdit::mouseDoubleClickEvent(QMouseEvent *){    return;}void PwdLineEdit::mouseMoveEvent(QMouseEvent *){    return;}void PwdLineEdit::keyPressEvent(QKeyEvent *event){    if(event->matches(QKeySequence::Copy))    {        return;    }    else if(event->matches(QKeySequence::SelectAll))    {        return;    }    else if(event->matches(QKeySequence::Paste))    {        return;    }    else if(event->key() == Qt::Key_Home)    {        this->setCursorPosition(0);    }    else if(event->key() == Qt::Key_End)    {        this->setCursorPosition(this->text().length());    }    else{        QLineEdit::keyPressEvent(event);    }}void PwdLineEdit::mousePressEvent(QMouseEvent *event){    //鼠标位置    int curMousePos = cursorPositionAt(event->pos());    //光标位置    int curCursorPos = this->cursorPosition();    if(curMousePos < curCursorPos)    {        this->setCursorPosition(curCursorPos-1);    }    else if(curMousePos < curMousePos)    {        this->setCursorPosition(curCursorPos+1);    }else    {        QLineEdit::mousePressEvent(event);    }}

3,事件过滤器

bool loginDlg::eventFilter(QObject *obj, QEvent *event){    if(obj == ui->nameEdit&& event->type() == QEvent::KeyPress)    {        QKeyEvent* keyevent = static_cast<QKeyEvent*>(event);        if(keyevent->key() == Qt::Key_Tab)        {            focusNextChild();            int len = ui->pwdEdit->text().length();            ui->pwdEdit->setSelection(len,len);            ui->pwdEdit->setFocus();            return true;        }else return false;    }    else return false;}

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