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UI/Qt: Left-align browser tab titles

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Use a small proxy style for the tab label control so QTabBar still
owns tab layout, scrolling, buttons, dragging, and native tab shapes.
Only the text draw flags change to use left alignment.
This commit is contained in:
Andreas Kling 2026-05-19 21:29:50 +02:00 committed by Andreas Kling
parent 9f8d4fdb3b
commit b6b13e3bbd
1 changed files with 36 additions and 0 deletions
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36
UI/Qt/TabBar.cpp
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@ -15,11 +15,43 @@
#include <QEvent>
#include <QHBoxLayout>
#include <QMouseEvent>
#include <QPainter>
#include <QProxyStyle>
#include <QStyleOption>
#include <QToolButton>
#include <QVBoxLayout>
namespace Ladybird {
class LeftAlignedTabStyle final : public QProxyStyle {
public:
virtual void drawControl(ControlElement element, QStyleOption const* option, QPainter* painter, QWidget const* widget = nullptr) const override
{
if (element != QStyle::CE_TabBarTabLabel) {
QProxyStyle::drawControl(element, option, painter, widget);
return;
}
auto const* tab = qstyleoption_cast<QStyleOptionTab const*>(option);
if (!tab) {
QProxyStyle::drawControl(element, option, painter, widget);
return;
}
QStyleOptionTab tab_without_text(*tab);
tab_without_text.text.clear();
QProxyStyle::drawControl(element, &tab_without_text, painter, widget);
auto text_rect = subElementRect(QStyle::SE_TabBarTabText, tab, widget);
int text_alignment = Qt::AlignLeft | Qt::AlignVCenter | Qt::TextShowMnemonic;
if (!styleHint(QStyle::SH_UnderlineShortcut, tab, widget))
text_alignment |= Qt::TextHideMnemonic;
drawItemText(painter, text_rect, text_alignment, tab->palette, tab->state & QStyle::State_Enabled, tab->text,
widget ? widget->foregroundRole() : QPalette::WindowText);
}
};
TabBar::TabBar(TabWidget* tab_widget)
: QTabBar(tab_widget)
, m_tab_widget(tab_widget)
@ -95,6 +127,10 @@ TabWidget::TabWidget(QWidget* parent)
: QWidget(parent)
{
m_tab_bar = new TabBar(this);
auto* tab_style = new LeftAlignedTabStyle;
tab_style->setParent(m_tab_bar);
m_tab_bar->setStyle(tab_style);
m_tab_bar->setDocumentMode(true);
m_tab_bar->setElideMode(Qt::TextElideMode::ElideRight);
m_tab_bar->setMovable(true);