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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.9.0
Affects Version/s: 5.7.1, 5.8.0
Component/s: Widgets: Styles, Widgets: Widgets and Dialogs
Labels:
None
Environment:
macOS Sierra 10.12.2

Platform/s:

macOS

Description

Hello! For some reason QTabWidget on macOS looks non-native when the document mode is active. The first image shows QTabWidget with ugly tabs, while the second - the standard Terminal app that has standard tabs.

The problem is that setDocumentMode(true) call makes the QTabWidget to enable the so-called document mode, when each tab contains an independent document. For some reason, Qt does not use the standard style for it.

Here is a code sample that reproduces the issue:
File MainWindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTabWidget>


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

    QTabWidget *tabs;
};

#endif // MAINWINDOW_H

File MainWindow.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPlainTextEdit>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    tabs = new QTabWidget(this);
    setCentralWidget(tabs);

    tabs->setDocumentMode(true);

    for (auto i = 0; i < 3; ++i) {
        auto editor = new QPlainTextEdit();
        tabs->addTab(editor, "Editor");
    }
}

MainWindow::~MainWindow()
{
    delete ui;
}