C++ 在 QTableWidget 中设置单元格的默认对齐方式
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Set default alignment for cells in QTableWidget
提问by jsalvador
I know you can set the alignment for each item using:
我知道您可以使用以下方法设置每个项目的对齐方式：
TableWidget->item(0,0)->setTextAlignment(Qt::AlignLeft);
However I would like to set a default alignment for all the cells in order to do not have to set it every time I create a new item. Is it possible?
但是，我想为所有单元格设置默认对齐方式，以便不必每次创建新项目时都进行设置。是否可以？
回答by UmNyobe
Yes it is possible. But you need to understand you are not modifying a property of the table widget, but a property of the table widget item. First create your own item, and set it up as you want
对的，这是可能的。但是您需要了解您不是在修改表格小部件的属性，而是修改表格小部件项的属性。首先创建您自己的项目，并根据需要进行设置
QTableWidgetItem * protoitem = new QTableWidgetItem();
protoitem->setTextAlignment(Qt::AlignLeft);
etc...
Then each time you want to create a new item rather than using the constructor you use
然后每次你想创建一个新项目而不是使用你使用的构造函数
QTableWidgetItem * newitem = protoitem->clone();
tableWidget->setItem(0,0, newitem);
Another alternative to clone (untested) is to set a prototypeon your tablewidget
克隆（未经测试）的另一种替代方法是在您的 tablewidget 上设置原型
QTableWidget::setItemPrototype ( const QTableWidgetItem * item )
This last one can be more appropriate if you are using a Ui or if the item is editable.
如果您使用的是 Ui 或者项目是可编辑的，那么最后一个可能更合适。
回答by Tim Meyer
I don't think there is an existing method for this, but here's two approaches that work:
我不认为有一个现有的方法，但这里有两种有效的方法：
1.) Subclass QTableWidgetItem
1.) 子类 QTableWidgetItem
MyTableWidgetItem::MyTableWidgetItem() :
QTableWidgetItem()
{
setTextAlignment( Qt::AlignLeft );
}
However, this is probably a bit overkill for just a single setting + you might want to overload all four constructors of QTableWidgetItem.
但是，这对于单个设置来说可能有点矫枉过正+您可能想要重载QTableWidgetItem 的所有四个构造函数。
2.) Another approach is using a factory instead of calling new:
Note: The linked article talks about unit testing, but there are many more advantages by doing that.
2.) 另一种方法是使用工厂而不是调用 new：
注意：链接的文章讨论了单元测试，但这样做有更多好处。
QTableWidgetItem* MyTableWidgetFactory::createTableWidgetItem( const QString& text ) const
{
QTableWidgetItem* item = new QTableWidgetItem( text );
item->setTextAlignment( Qt::AlignLeft );
return item;
}
Then instead of
然后代替
QTableWidgetItem* myItem = new QTableWidgetItem( "foo" );
item->setTextAlignment( Qt::AlignLeft );
you can do
你可以做
QTableWidgetItem* myItem = myFactory->createTableWidgetItem( "foo" );
where myFactoryis an object of MyTableWidgetFactory.
myFactory的对象在哪里MyTableWidgetFactory。
