141 lines
4.6 KiB
C++
141 lines
4.6 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2022 Craig Drummond <craig.p.drummond@gmail.com>
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*
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* ----
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "basicitemdelegate.h"
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#include "support/gtkstyle.h"
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#include "support/utils.h"
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#include <QStyleOption>
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#include <QPainter>
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#include <QStyle>
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#include <QStyledItemDelegate>
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#include <QApplication>
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#include <QAbstractItemView>
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void BasicItemDelegate::drawLine(QPainter *p, const QRect &r, const QColor &color, bool fadeStart, bool fadeEnd, double alpha)
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{
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QColor col(color);
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QLinearGradient grad(r.bottomLeft(), r.bottomRight());
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if (fadeStart || fadeEnd) {
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double fadeSize=(fadeStart && fadeEnd ? 64.0 : 32.0);
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if (r.width()<(2.2*fadeSize)) {
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fadeSize=r.width()/3.0;
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}
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double fadePos=fadeSize/r.width();
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col.setAlphaF(fadeStart ? 0.0 : alpha);
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grad.setColorAt(0, col);
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col.setAlphaF(alpha);
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grad.setColorAt(fadePos, col);
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grad.setColorAt(1.0-fadePos, col);
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col.setAlphaF(fadeEnd ? 0.0 : alpha);
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grad.setColorAt(1, col);
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p->setPen(QPen(grad, 1));
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} else {
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col.setAlphaF(alpha);
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p->setPen(QPen(col, 1));
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}
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p->drawLine(r.bottomLeft(), r.bottomRight());
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}
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BasicItemDelegate::BasicItemDelegate(QObject *p)
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: QStyledItemDelegate(p)
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, trackMouse(false)
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, underMouse(false)
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{
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if (GtkStyle::isActive() && qobject_cast<QAbstractItemView *>(p)) {
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static_cast<QAbstractItemView *>(p)->setAttribute(Qt::WA_MouseTracking);
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trackMouse=true;
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p->installEventFilter(this);
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}
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}
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BasicItemDelegate::~BasicItemDelegate()
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{
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}
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void BasicItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
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{
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if (!index.isValid()) {
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return;
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}
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bool selected=option.state&QStyle::State_Selected;
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bool active=option.state&QStyle::State_Active;
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if (GtkStyle::isActive()) {
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bool mouseOver=option.state&QStyle::State_MouseOver;
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QStyleOptionViewItem opt = option;
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initStyleOption(&opt, index);
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if (trackMouse && !underMouse) {
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mouseOver=false;
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}
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if (mouseOver) {
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opt.showDecorationSelected=true;
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GtkStyle::drawSelection(option, painter, selected ? 0.75 : 0.25);
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opt.showDecorationSelected=false;
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opt.state&=~(QStyle::State_MouseOver|QStyle::State_Selected);
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opt.backgroundBrush=QBrush(Qt::transparent);
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if (selected) {
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opt.palette.setBrush(QPalette::Text, opt.palette.highlightedText());
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}
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}
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QApplication::style()->drawControl(QStyle::CE_ItemViewItem, &opt, painter, opt.widget);
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} else {
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QStyledItemDelegate::paint(painter, option, index);
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}
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QColor col(option.palette.color(active ? QPalette::Active : QPalette::Inactive,
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selected ? QPalette::HighlightedText : QPalette::Text));
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switch (((QStyleOptionViewItem &)option).viewItemPosition) {
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case QStyleOptionViewItem::Beginning:
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drawLine(painter, option.rect, col, true, false);
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break;
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case QStyleOptionViewItem::Middle:
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drawLine(painter, option.rect, col, false, false);
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break;
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case QStyleOptionViewItem::End:
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drawLine(painter, option.rect, col, false, true);
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break;
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case QStyleOptionViewItem::Invalid:
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case QStyleOptionViewItem::OnlyOne:
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drawLine(painter, option.rect, col, true, true);
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}
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}
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bool BasicItemDelegate::eventFilter(QObject *object, QEvent *event)
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{
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if (object==parent()) {
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if (QEvent::Enter==event->type()) {
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underMouse=true;
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static_cast<QAbstractItemView *>(parent())->viewport()->update();
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} else if (QEvent::Leave==event->type()) {
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underMouse=false;
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static_cast<QAbstractItemView *>(parent())->viewport()->update();
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}
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}
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return QStyledItemDelegate::eventFilter(object, event);
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}
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