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The TabBar itself does not stretch the entire width of the TabWidget, because it leaves space for the width of the new-tab button. So, we manually tell Qt to paint the TabBar's background into the gap. Fixes #768.
127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/*
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* Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
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* Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
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* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Tab.h"
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#include <AK/StdLibExtras.h>
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#include <AK/TypeCasts.h>
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#include <Ladybird/Qt/TabBar.h>
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#include <QContextMenuEvent>
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#include <QEvent>
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#include <QPushButton>
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#include <QStylePainter>
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namespace Ladybird {
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TabBar::TabBar(QWidget* parent)
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: QTabBar(parent)
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{
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}
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QSize TabBar::tabSizeHint(int index) const
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{
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auto width = this->width() / count();
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width = min(225, width);
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width = max(128, width);
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auto hint = QTabBar::tabSizeHint(index);
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hint.setWidth(width);
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return hint;
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}
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void TabBar::contextMenuEvent(QContextMenuEvent* event)
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{
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auto* tab_widget = verify_cast<QTabWidget>(this->parent());
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auto* tab = verify_cast<Tab>(tab_widget->widget(tabAt(event->pos())));
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if (tab)
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tab->context_menu()->exec(event->globalPos());
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}
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TabWidget::TabWidget(QWidget* parent)
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: QTabWidget(parent)
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{
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// This must be called first, otherwise several of the options below have no effect.
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setTabBar(new TabBar(this));
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setDocumentMode(true);
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setElideMode(Qt::TextElideMode::ElideRight);
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setMovable(true);
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setTabsClosable(true);
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setStyle(new TabStyle(this));
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installEventFilter(parent);
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}
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void TabWidget::paintEvent(QPaintEvent*)
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{
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auto prepare_style_options = [](QTabBar* tab_bar, QSize widget_size) {
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QStyleOptionTabBarBase style_options;
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QStyleOptionTab tab_overlap;
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tab_overlap.shape = tab_bar->shape();
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auto overlap = tab_bar->style()->pixelMetric(QStyle::PM_TabBarBaseOverlap, &tab_overlap, tab_bar);
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style_options.initFrom(tab_bar);
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style_options.shape = tab_bar->shape();
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style_options.documentMode = tab_bar->documentMode();
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// NOTE: This assumes the tab bar is at the top of the tab widget.
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style_options.rect = { 0, widget_size.height() - overlap, widget_size.width(), overlap };
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return style_options;
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};
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QStylePainter painter { this, tabBar() };
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if (auto* widget = cornerWidget(Qt::TopRightCorner)) {
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// Manually paint the background for the area where the "new tab" button would have been
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// if we hadn't relocated it in `TabStyle::subElementRect()`.
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auto style_options = prepare_style_options(tabBar(), widget->size());
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style_options.rect.translate(tabBar()->rect().width(), widget->y());
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painter.drawPrimitive(QStyle::PE_FrameTabBarBase, style_options);
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}
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}
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TabBarButton::TabBarButton(QIcon const& icon, QWidget* parent)
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: QPushButton(icon, {}, parent)
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{
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resize({ 20, 20 });
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setFlat(true);
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}
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bool TabBarButton::event(QEvent* event)
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{
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if (event->type() == QEvent::Enter)
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setFlat(false);
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if (event->type() == QEvent::Leave)
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setFlat(true);
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return QPushButton::event(event);
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}
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TabStyle::TabStyle(QObject* parent)
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{
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setParent(parent);
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}
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QRect TabStyle::subElementRect(QStyle::SubElement sub_element, QStyleOption const* option, QWidget const* widget) const
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{
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// Place our add-tab button (set as the top-right corner widget) directly after the last tab
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if (sub_element == QStyle::SE_TabWidgetRightCorner) {
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auto* tab_widget = verify_cast<TabWidget>(widget);
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auto tab_bar_size = tab_widget->tabBar()->sizeHint();
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auto new_tab_button_size = tab_bar_size.height();
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return QRect {
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qMin(tab_bar_size.width(), tab_widget->width() - new_tab_button_size),
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0,
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new_tab_button_size,
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new_tab_button_size
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};
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}
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return QProxyStyle::subElementRect(sub_element, option, widget);
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}
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}
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