qt - qlineedit自动调整大小到内容

我正在尝试使用lineedit和按钮制作一个小部件。如果单击该按钮，它将打开一个文件对话框，在这里我可以选择一个文件。然后，文件名应显示在lineedit中。这是我到目前为止所得到的:

#include "widget_openimage.h"
#include <QFontMetrics>

Widget_openimage::Widget_openimage(QWidget *parent) : QWidget(parent) {

// horizontal layout
layout = new QHBoxLayout();

// linedit on the left which shows the path of the chosen file
lineedit = new QLineEdit();
lineedit->setReadOnly(true);

// pushbutton on the right to select the file
btn = new QPushButton("...");
btn->setFixedSize(20,20);
connect(btn, SIGNAL(clicked()), this, SLOT(btn_clicked()));
connect(lineedit, SIGNAL(textChanged(QString)), this, SLOT(resize_to_content()));

layout->addWidget(lineedit);
layout->addWidget(btn);
this->setLayout(layout);
}

void Widget_openimage::btn_clicked() {
QString filename = QFileDialog::getOpenFileName(this,tr("Open"), "", tr("Image Files (*.png *.jpg *.bmp));
if (filename.isEmpty())
return;
else {
      lineedit->setText(filename);
     }
}

void Widget_openimage::resize_to_content() {
QString text = lineedit->text();
QFontMetrics fm = lineedit->fontMetrics();
int width = fm.boundingRect(text).width();
lineedit->resize(width, lineedit->height());
}

按钮的openfile功能可以正常工作，并且正确的路径也显示在lineedit中。但是调整大小不起作用。有人可以帮我吗？

最佳答案

首先，您的代码存在一些格式问题，因此我对其进行了编辑并添加了一些我自己的代码。我使用setFixedSize()而不是resize()是因为用户可以决定最小化窗口，如果发生这种情况，那么为什么您必须麻烦显示完整的文件路径(我猜您出于某种原因希望始终显示完整的路径，并且没有用户能够将窗口最小化到并非lineedit中的所有文本都显示出来的程度。

Widget_openimage::Widget_openimage(QWidget *parent) : QWidget(parent) {

    // horizontal layout
    layout = new QHBoxLayout();

    // linedit on the left which shows the path of the chosen file
    lineedit = new QLineEdit;
    lineedit->setReadOnly(true);

    // pushbutton on the right to select the file
    btn = new QPushButton("...");
    btn->setFixedSize(20,20);

    connect(btn, SIGNAL(clicked()), this, SLOT(btn_clicked()));

    //do this connection so when the text in line edit is changed, its size    changes to show the full text
    connect(lineedit, SIGNAL(textChanged(QString)), this, SLOT(resize_to_content()));

    layout->addWidget(lineedit);
    layout->addWidget(btn);
    this->setLayout(layout);
}

void Widget_openimage::btn_clicked() {
    QString filename = QFileDialog::getOpenFileName(this,tr("Open"), "", tr("Image Files (*.png *.jpg *.bmp)"));

    //you have to set the file path text somewhere here
    lineedit->setText(filename);

    if (filename.isEmpty()) {
        return;
    }
}

void Widget_openimage::resize_to_content() {
    QString text = lineedit->text();

    //use QFontMetrics this way;
    QFont font("", 0);
    QFontMetrics fm(font);
    int pixelsWide = fm.width(text);
    int pixelsHigh = fm.height();

    lineedit->setFixedSize(pixelsWide, pixelsHigh);

    Widget_openimage::adjustSize();
}

关于qt - qlineedit自动调整大小到内容，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30031103/