Qlineedit auto resize for content
I am trying to make a small widget with a line and a button. If the button is clicked, it should open the filedialog where I can select the file. Then the filename should appear on the line. This is what I got so far:
#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());
}
the openfile function of the button works fine and the right path is also displayed in lineedit. however resizing doesn't work. can anyone give me a hand?
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First of all, there are some formatting issues with your code, so I edited them and added some of my own. I used setFixedSize()
instead resize()
because the user might decide to minimize the window, and if that happens then why should you bother showing the full path to the file (I assume you want to show the full path at all times for a reason and not to have the user able to minimize the window to the point where not all of the text in the lineedit
.
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();
}
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