Qt - QTableWidget 单元格中的 QIcon

发布于 2024-12-14 16:29:28 字数 693 浏览 0 评论 0原文

我尝试了多种方法在 QTableWidget 单元格中显示 QIcon，但我不确定为什么它不起作用。我有一个按钮，按下该按钮会在表格中添加一行。这是代码...

void MainWindow::pressed()
{
    QTableWidgetItem *item = new QTableWidgetItem("Hello, world!");
    QTableWidgetItem *icon_item = new QTableWidgetItem;
    QIcon icon("/verified/path/to/icon.png");
    icon_item->setIcon(icon);

    int row = ui->tableFeed->rowCount();
    ui->tableFeed->insertRow(row);
    ui->tableFeed->setItem(row, 0, icon_item);
    ui->tableFeed->setItem(row, 1, item);
}

但它不起作用。该单元格中没有显示任何内容。有什么想法吗？

编辑：我将其设置为 icon 的 setItem 调用是一个拼写错误。实际代码将其设置为QTabeWidgetItem icon_item。我已经在上面的代码中更正了它。

原文

I have tried numerous ways to display a QIcon in a QTableWidget cell and I am not sure why it is not working. I have a button that when pressed adds a row to the table. Here is the code...

void MainWindow::pressed()
{
    QTableWidgetItem *item = new QTableWidgetItem("Hello, world!");
    QTableWidgetItem *icon_item = new QTableWidgetItem;
    QIcon icon("/verified/path/to/icon.png");
    icon_item->setIcon(icon);

    int row = ui->tableFeed->rowCount();
    ui->tableFeed->insertRow(row);
    ui->tableFeed->setItem(row, 0, icon_item);
    ui->tableFeed->setItem(row, 1, item);
}

And it just doesn't work. Nothing is displayed in that cell. Any ideas?

EDIT: the setItem call where I set it to icon was a typo. The actual code sets it to the QTabeWidgetItem icon_item. I have corrected it in the code above.

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月隐月明月朦胧 2024-12-21 16:29:35

当我想向单元格添加图标时，我通常在模型中进行。

在数据方法中，您可以将它们放在装饰角色下。

else if( role == Qt::DecorationRole )
{
    switch( index.column() )
    {
        case MOVIE:
        {
            if( valueAt( index ).toString() == "Godfather" ) return QIcon( ":/16x16/godfather.png" );
        }
    }
}

希望这有帮助。

When I want to add an icon to a cell, I usually do it in the model.

In the data method you can put them under the decoration role.

else if( role == Qt::DecorationRole )
{
    switch( index.column() )
    {
        case MOVIE:
        {
            if( valueAt( index ).toString() == "Godfather" ) return QIcon( ":/16x16/godfather.png" );
        }
    }
}

Hope this helps.

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人心善变 2024-12-21 16:29:34

正如 webclectic 所指出的，您可能希望将该项设置为 icon_item：

ui->tableFeed->setItem(row, 0, icon_item);

...如果它确实以这种方式编译，那么我猜它正在使用其可用构造函数。

我不确定如果无法从指定的 png 构造图标会发生什么，但您也可以检查以确保图标确实已正确加载并且可以正确显示。例如，icon.isNull() 返回什么？如果将其放入标签中会发生什么？

另一种选择是从像素图中加载图标，以便您可以验证它是否确实正确加载：

QPixmap p;
if (!p.load(yourFilename) || p.isNull()) { qDebug() << "Error!"; }
QIcon icon = QIcon(p);
// and if wanted: label->setPixmap(p)

As webclectic pointed out, you probably want to set the item to icon_item:

ui->tableFeed->setItem(row, 0, icon_item);

...if it indeed compiled that way then I'd guess it's constructing an implicit QTableWidgetItem using one of its available constructors.

I'm not sure what happens if the icon can't be constructed from the specified png, but you might also check to make sure that the icon was indeed loaded correctly and can be displayed correctly. For example, what does icon.isNull() return? What happens if you put it in a label?

Another option is to load the icon from a pixmap so you can verify that it is indeed loaded properly:

QPixmap p;
if (!p.load(yourFilename) || p.isNull()) { qDebug() << "Error!"; }
QIcon icon = QIcon(p);
// and if wanted: label->setPixmap(p)

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时常饿 2024-12-21 16:29:33

您必须首先创建一个带有前缀图标的资源才能工作：

item = QtGui.QTableWidgetItem()
icon2 = QtGui.QIcon()
icon2.addPixmap(QtGui.QPixmap(_fromUtf8(":/icons/FSTable.png")), QtGui.QIcon.Normal, QtGui.QIcon.Off)
item.setIcon(icon2)

请原谅上面是 PyQt 代码，但您可以看到图标必须使用 addPixmap 设置

You'll have to first create a resource with prefix icons for these to work:

item = QtGui.QTableWidgetItem()
icon2 = QtGui.QIcon()
icon2.addPixmap(QtGui.QPixmap(_fromUtf8(":/icons/FSTable.png")), QtGui.QIcon.Normal, QtGui.QIcon.Off)
item.setIcon(icon2)

Pardon that the above is a PyQt code, but you can see the icon must be set up using addPixmap

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燕归巢 2024-12-21 16:29:32

您必须将图标设置为QTableWidgetItem，然后加载图标项而不是图标本身。

QTableWidgetItem *item = new QTableWidgetItem("Hello, world!");
QTableWidgetItem *icon_item = new QTableWidgetItem;
QIcon icon("/verified/path/to/icon.png"); // It is better to load the icon from the
                                          // resource file and not from a path 
icon_item->setIcon(icon);

int row = ui->tableFeed->rowCount();
ui->tableFeed->insertRow(row);
ui->tableFeed->setItem(row, 0, icon_item);
ui->tableFeed->setItem(row, 1, item);

如果您可以看到字符串项而不是图标，则图标路径有问题。

You have to set the icon to a QTableWidgetItem and then load the icon item and not the icon itself.

QTableWidgetItem *item = new QTableWidgetItem("Hello, world!");
QTableWidgetItem *icon_item = new QTableWidgetItem;
QIcon icon("/verified/path/to/icon.png"); // It is better to load the icon from the
                                          // resource file and not from a path 
icon_item->setIcon(icon);

int row = ui->tableFeed->rowCount();
ui->tableFeed->insertRow(row);
ui->tableFeed->setItem(row, 0, icon_item);
ui->tableFeed->setItem(row, 1, item);

If you can see the string item and not the icon then something is wrong with the icon path.

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