QlineEdit::focus
时间: 2023-08-11 11:08:03 浏览: 98
QLineEdit::focus 是一个Qt框架中的信号,用于指示QLineEdit控件获得焦点(被选中)。当一个QLineEdit控件获得焦点时,它会发出这个信号,你可以连接该信号到一个槽函数,以执行相应的操作。例如,你可以在获得焦点时改变文本颜色或显示一个提示信息。这个信号的定义如下:
```cpp
void QLineEdit::focusInEvent(QFocusEvent *event);
```
当QLineEdit控件获得焦点时,会触发focusInEvent事件,你可以重写这个事件并执行你想要的操作。
相关问题
QLineEdit qss
As an AI language model, I do not have the capability to create a graphical user interface, but I can provide information on how to style a QLineEdit using qss.
Qss (Qt Style Sheets) is a powerful tool to customize the look and feel of Qt-based applications. Here's an example of how to style a QLineEdit:
```
QLineEdit {
border: 2px solid gray;
border-radius: 10px;
padding: 5px;
background-color: #f3f3f3;
}
QLineEdit:focus {
border: 2px solid blue;
outline: none;
}
```
In the code above, we have defined the following styles for a QLineEdit:
- `border`: sets the width, style, and color of the border around the widget.
- `border-radius`: sets the radius of the corners of the widget.
- `padding`: sets the space between the widget's content and its border.
- `background-color`: sets the background color of the widget.
The `:focus` pseudo-state is used to set the style when the widget has focus. In this case, we have changed the border color and removed the default outline.
You can apply these styles to a specific QLineEdit widget by setting its `styleSheet` property:
```
QLineEdit *lineEdit = new QLineEdit(this);
lineEdit->setStyleSheet("/* style sheet code here */");
```
QLineEdit 没有 setIconSize() 的方法
非常抱歉,我之前的回答有误。确实,QLineEdit没有setIconSize()方法。要设置QLineEdit中图标的大小,您可以使用QLineEdit中的样式表来设置。
以下是一个使用C++代码将QLineEdit中的图标大小设置为30x30像素的示例:
```cpp
// 获取QComboBox的QLineEdit对象
QLineEdit* lineEdit = ui->comboBox->lineEdit();
// 设置左侧图标的大小为30x30像素
QPixmap pixmap(":/icon/path");
QIcon icon(pixmap);
lineEdit->setStyleSheet("QLineEdit { padding-left: 30px; }");
lineEdit->setClearButtonEnabled(true);
lineEdit->setFixedSize(200, 30);
lineEdit->setStyleSheet(QString("QLineEdit{border: 1px solid gray;border-radius: 3px;padding-left: 30px;} QLineEdit::hover{border-color: blue;} QLineEdit::focus{border-color: blue;}"
"QLineEdit::icon {"
" width: 30px;"
" height: 30px;"
"}"));
// 设置右侧图标的大小为30x30像素
QPixmap rightPixmap(":/icon/path");
QIcon rightIcon(rightPixmap);
QToolButton* clearButton = lineEdit->findChild<QToolButton*>("qt_clear_button");
if (clearButton) {
clearButton->setIcon(rightIcon);
clearButton->setFixedSize(30, 30);
}
```
在上面的代码中,我们首先使用ui->comboBox->lineEdit()获取QComboBox的QLineEdit对象,然后使用setStyleSheet()方法来设置左侧图标的样式表。在样式表中,我们使用QLineEdit::icon伪元素来设置图标的大小为30x30像素。类似地,我们还可以使用样式表设置右侧图标的大小和样式。
请注意,样式表中的样式会应用于QLineEdit中的所有图标。如果要对单个图标进行自定义,请使用QLineEdit的setStyleSheet()方法和相应的伪元素。