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transmission/qt/FilterBarComboBox.cc
2023-02-11 14:49:42 -06:00

126 lines
4.3 KiB
C++

// This file Copyright © 2012-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <QApplication>
#include <QStyle>
#include <QStylePainter>
#include "FilterBarComboBox.h"
#include "StyleHelper.h"
#include "Utils.h"
namespace
{
int getHSpacing(QWidget const* w)
{
return qMax(3, w->style()->pixelMetric(QStyle::PM_LayoutHorizontalSpacing, nullptr, w));
}
} // namespace
FilterBarComboBox::FilterBarComboBox(QWidget* parent)
: QComboBox(parent)
{
setSizeAdjustPolicy(QComboBox::AdjustToContents);
}
QSize FilterBarComboBox::minimumSizeHint() const
{
QFontMetrics const fm(fontMetrics());
QSize const text_size = fm.size(0, itemText(0));
QSize const count_size = fm.size(0, itemData(0, CountStringRole).toString());
return calculateSize(text_size, count_size);
}
QSize FilterBarComboBox::sizeHint() const
{
QFontMetrics const fm(fontMetrics());
QSize max_text_size(0, 0);
QSize max_count_size(0, 0);
for (int i = 0, n = count(); i < n; ++i)
{
QSize const text_size = fm.size(0, itemText(i));
max_text_size.setHeight(qMax(max_text_size.height(), text_size.height()));
max_text_size.setWidth(qMax(max_text_size.width(), text_size.width()));
QSize const count_size = fm.size(0, itemData(i, CountStringRole).toString());
max_count_size.setHeight(qMax(max_count_size.height(), count_size.height()));
max_count_size.setWidth(qMax(max_count_size.width(), count_size.width()));
}
return calculateSize(max_text_size, max_count_size);
}
QSize FilterBarComboBox::calculateSize(QSize const& text_size, QSize const& count_size) const
{
int const hmargin = getHSpacing(this);
QStyleOptionComboBox option;
initStyleOption(&option);
QSize content_size = iconSize() + QSize(4, 2);
content_size.setHeight(qMax(content_size.height(), text_size.height()));
content_size.rwidth() += hmargin + text_size.width();
content_size.rwidth() += hmargin + count_size.width();
return style()->sizeFromContents(QStyle::CT_ComboBox, &option, content_size, this);
}
void FilterBarComboBox::paintEvent(QPaintEvent* e)
{
Q_UNUSED(e)
QStylePainter painter(this);
painter.setPen(palette().color(QPalette::Text));
// draw the combobox frame, focusrect and selected etc.
QStyleOptionComboBox opt;
initStyleOption(&opt);
painter.drawComplexControl(QStyle::CC_ComboBox, opt);
// draw the icon and text
QModelIndex const model_index = model()->index(currentIndex(), 0, rootModelIndex());
if (model_index.isValid())
{
QStyle const* const s = style();
int const hmargin = getHSpacing(this);
QRect rect = s->subControlRect(QStyle::CC_ComboBox, &opt, QStyle::SC_ComboBoxEditField, this);
rect.adjust(2, 1, -2, -1);
// draw the icon
if (auto const icon = Utils::getIconFromIndex(model_index); !icon.isNull())
{
auto const icon_rect = QStyle::alignedRect(opt.direction, Qt::AlignLeft | Qt::AlignVCenter, opt.iconSize, rect);
icon.paint(&painter, icon_rect, Qt::AlignCenter, StyleHelper::getIconMode(opt.state), QIcon::Off);
Utils::narrowRect(rect, icon_rect.width() + hmargin, 0, opt.direction);
}
// draw the count
QString text = model_index.data(CountStringRole).toString();
if (!text.isEmpty())
{
QPen const pen = painter.pen();
painter.setPen(Utils::getFadedColor(pen.color()));
QRect const text_rect = QStyle::alignedRect(
opt.direction,
Qt::AlignRight | Qt::AlignVCenter,
QSize(opt.fontMetrics.size(0, text).width(), rect.height()),
rect);
painter.drawText(text_rect, Qt::AlignRight | Qt::AlignVCenter, text);
Utils::narrowRect(rect, 0, text_rect.width() + hmargin, opt.direction);
painter.setPen(pen);
}
// draw the text
text = model_index.data(Qt::DisplayRole).toString();
text = painter.fontMetrics().elidedText(text, Qt::ElideRight, rect.width());
painter.drawText(rect, Qt::AlignLeft | Qt::AlignVCenter, text);
}
}