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focusframe.cpp
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/* focusframe.cpp - A focus indicator for labels.
* Copyright (C) 2022 g10 Code GmbH
*
* Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-2.0+
*/
#include "focusframe.h"
#if QT_CONFIG(graphicseffect)
#include <QGraphicsEffect>
#endif
#include <QStyleOptionFocusRect>
#include <QStylePainter>
static QRect effectiveWidgetRect(const QWidget *w)
{
// based on QWidgetPrivate::effectiveRectFor
#if QT_CONFIG(graphicseffect)
const auto* const graphicsEffect = w->graphicsEffect();
if (graphicsEffect && graphicsEffect->isEnabled())
return graphicsEffect->boundingRectFor(w->rect()).toAlignedRect();
#endif // QT_CONFIG(graphicseffect)
return w->rect();
}
static QRect clipRect(const QWidget *w)
{
// based on QWidgetPrivate::clipRect
if (!w->isVisible()) {
return QRect();
}
QRect r = effectiveWidgetRect(w);
int ox = 0;
int oy = 0;
while (w && w->isVisible() && !w->isWindow() && w->parentWidget()) {
ox -= w->x();
oy -= w->y();
w = w->parentWidget();
r &= QRect(ox, oy, w->width(), w->height());
}
return r;
}
void FocusFrame::paintEvent(QPaintEvent *)
{
if (!widget()) {
return;
}
QStylePainter p{this};
QStyleOptionFocusRect option;
initStyleOption(&option);
const int vmargin = style()->pixelMetric(QStyle::PM_FocusFrameVMargin, &option);
const int hmargin = style()->pixelMetric(QStyle::PM_FocusFrameHMargin, &option);
const QRect rect = clipRect(widget()).adjusted(0, 0, hmargin*2, vmargin*2);
p.setClipRect(rect);
p.drawPrimitive(QStyle::PE_FrameFocusRect, option);
}
#include "focusframe.moc"

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