如何获取QLabel扩展到全宽? [英] How do I get a QLabel to expand to full width?
问题描述
我想要一个 QLabel
展开到容器的整个宽度,无论内容如何。 (我想这是因为我动态设置文本和添加小部件,以后它导致它切断部分文本)
I want a QLabel
to expand to full width of the container regardless of the contents. (I want this because I dynamically set the text and add widgets later which cause it to cut off part of the text)
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
this->setFixedSize(100,100);
QHBoxLayout *layout = new QHBoxLayout;
this->setLayout(layout);
QLabel *label = new QLabel;
label->setStyleSheet("background-color:blue");
label->setSizePolicy(QSizePolicy::MinimumExpanding,
QSizePolicy::MinimumExpanding);
label->setText(tr("test"));
layout->addWidget(label, 0, Qt::AlignTop | Qt::AlignLeft);
}
此代码显示蓝色框不会展开到整个宽度,为什么?
This code shows that the blue box does not expand to the entire width, why?
推荐答案
您必须设置:
layout->setContentsMargins(0,0,0,0);
默认情况下,每个QWidget或QFrame在每个方向添加15像素的边距。
By default every QWidget or QFrame add 15 pixels of margin in every direction.
主要的问题是当你添加小部件到布局时设置对齐。改用 label-> setAlignment
。
The main problem is with setting the alignment when you add the widget to the layout. Use label->setAlignment
instead.
layout->addWidget(label);
我编译了您的代码,它适用于这些更改。
I compiled your code, it works with those changes.
这是最小的例子:
#include <QApplication>
#include <QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget* w = new QWidget;
w->setFixedSize(100,100);
QHBoxLayout* layout = new QHBoxLayout;
layout->setContentsMargins(0,0,0,0);
w->setLayout(layout);
QLabel* label = new QLabel;
label->setAlignment(Qt::AlignTop | Qt::AlignLeft);
label->setContentsMargins(0,0,0,0);
label->setStyleSheet("background-color:blue");
label->setSizePolicy(QSizePolicy::MinimumExpanding,
QSizePolicy::MinimumExpanding);
label->setText("test");
layout->addWidget(label);
w->show();
return a.exec();
}
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