c++ - 从代码创建的 QPushButton 的最小尺寸/宽度

Question

我创建了 2 行按钮，每行都在 QHBoxLayout 中。

我在代码中创建按钮:

static const char* buttonText = "23456789TJQKA";
for (int ii = 0; buttonText[ii]; ii++)
{
    QPushButton* pushButton = new QPushButton(this);
    pushButton->setText(QString(buttonText[ii]));
    ui->horizontalLayout_1->addWidget(pushButton);
}
for (int ii = 0; buttonText[ii]; ii++)
{
    QPushButton* pushButton = new QPushButton(this);
    pushButton->setText(QString(buttonText[ii]));
    ui->horizontalLayout_2->addWidget(pushButton);
}

问题是它们不能缩小(当用户调整对话框大小时)超过该尺寸，即使它们的文本适合更小的宽度。如果我在资源编辑器中而不是在代码中手动创建按钮，它们的宽度可以比这更小。

Answer 1

发生这种情况是因为QPushButton 的minimumSizeHint 不允许QLayout 调整它的大小:

The default implementation of minimumSizeHint() returns an invalid size if there is no layout for this widget, and returns the layout's minimum size otherwise. Most built-in widgets reimplement minimumSizeHint().

QLayout will never resize a widget to a size smaller than the minimum size hint unless minimumSize() is set or the size policy is set to QSizePolicy::Ignore. If minimumSize() is set, the minimum size hint will be ignored.

简单的解决方案是显式设置最小宽度:

static const char* buttonText = "23456789TJQKA";
for (int ii = 0; buttonText[ii]; ii++)
{
   QPushButton* pushButton = new QPushButton(this);
   pushButton->setMinimumWidth(5);
   pushButton->setText(QString(buttonText[ii]));
   ui->horizontalLayout_1->addWidget(pushButton);
}
for (int ii = 0; buttonText[ii]; ii++)
{
   QPushButton* pushButton = new QPushButton(this);
   pushButton->setMinimumWidth(5);
   pushButton->setText(QString(buttonText[ii]));
   ui->horizontalLayout_2->addWidget(pushButton);
}