QStyledItemDelegate单元格文本定时改变颜色,c++
时间: 2024-05-12 07:14:24 浏览: 137
要实现单元格文本的定时改变颜色,可以继承 QStyledItemDelegate 类,然后在 paint() 函数中进行处理。具体实现步骤如下:
1. 定义一个 QTimer 对象,用于定时触发改变颜色。
2. 在构造函数中启动 QTimer。
3. 在 paint() 函数中,根据当前时间计算出应该显示的颜色,然后使用 QPainter 绘制文本。
下面是一个简单的示例代码,实现了每隔 1 秒钟改变单元格文本的颜色:
```c++
class MyDelegate : public QStyledItemDelegate
{
public:
MyDelegate(QObject* parent = nullptr) : QStyledItemDelegate(parent)
{
// 启动定时器
QTimer* timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, &MyDelegate::onTimeout);
timer->start(1000); // 每隔 1 秒钟触发一次定时器
}
void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override
{
// 获取单元格的文本
QString text = index.data(Qt::DisplayRole).toString();
// 根据当前时间计算出应该显示的颜色
QColor color = getColor();
// 绘制文本
painter->save();
painter->setPen(color);
painter->drawText(option.rect, Qt::AlignVCenter | Qt::AlignLeft, text);
painter->restore();
}
private:
QColor getColor() const
{
// 获取当前时间
QTime time = QTime::currentTime();
// 计算出应该显示的颜色
int r = time.minute() * 4;
int g = time.second() * 4;
int b = 128;
return QColor(r, g, b);
}
void onTimeout()
{
// 触发定时器,强制更新列表中所有的项
emit sizeHintChanged(QModelIndex());
}
};
```
使用时,可以将该自定义委托应用到需要改变颜色的单元格上,例如:
```c++
QTableView* tableView = new QTableView(this);
tableView->setItemDelegate(new MyDelegate(this));
```
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