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pcmanfm-qt-packaging/pcmanfm/desktopitemdelegate.cpp

195 lines
6.9 KiB

/*
Copyright (C) 2013 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "desktopitemdelegate.h"
#include <libfm-qt/foldermodel.h>
#include <QApplication>
#include <QListView>
#include <QPainter>
#include <QIcon>
#include <QTextLayout>
#include <QTextOption>
#include <QTextLine>
namespace PCManFM {
DesktopItemDelegate::DesktopItemDelegate(QListView* view, QObject* parent):
QStyledItemDelegate(parent ? parent : view),
view_(view),
symlinkIcon_(QIcon::fromTheme("emblem-symbolic-link")),
shadowColor_(0, 0, 0) {
}
// FIXME: we need to figure out a way to derive from Fm::FolderItemDelegate to avoid code duplication.
void DesktopItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {
Q_ASSERT(index.isValid());
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
painter->save();
painter->setClipRect(option.rect);
opt.decorationAlignment = Qt::AlignHCenter | Qt::AlignTop;
opt.displayAlignment = Qt::AlignTop | Qt::AlignHCenter;
// draw the icon
QIcon::Mode iconMode;
if(opt.state & QStyle::State_Enabled) {
if(opt.state & QStyle::State_Selected)
iconMode = QIcon::Selected;
else {
iconMode = QIcon::Normal;
}
}
else
iconMode = QIcon::Disabled;
QPoint iconPos(opt.rect.x() + (opt.rect.width() - opt.decorationSize.width()) / 2, opt.rect.y());
QPixmap pixmap = opt.icon.pixmap(opt.decorationSize, iconMode);
painter->drawPixmap(iconPos, pixmap);
// draw some emblems for the item if needed
// we only support symlink emblem at the moment
FmFileInfo* file = static_cast<FmFileInfo*>(index.data(Fm::FolderModel::FileInfoRole).value<void*>());
if(file) {
if(fm_file_info_is_symlink(file)) {
painter->drawPixmap(iconPos, symlinkIcon_.pixmap(opt.decorationSize / 2, iconMode));
}
}
// draw text
QSize gridSize = view_->gridSize() - QSize(6, 6);
QRectF textRect(opt.rect.x() - (gridSize.width() - opt.rect.width()) / 2,
opt.rect.y() + opt.decorationSize.height(),
gridSize.width(),
gridSize.height() - opt.decorationSize.height());
drawText(painter, opt, textRect);
if(opt.state & QStyle::State_HasFocus) {
// FIXME: draw focus rect
}
painter->restore();
}
void DesktopItemDelegate::drawText(QPainter* painter, QStyleOptionViewItemV4& opt, QRectF& textRect) const {
QTextLayout layout(opt.text, opt.font);
QTextOption textOption;
textOption.setAlignment(opt.displayAlignment);
textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
textOption.setTextDirection(opt.direction);
layout.setTextOption(textOption);
qreal height = 0;
qreal width = 0;
int visibleLines = 0;
layout.beginLayout();
QString elidedText;
textRect.adjust(2, 2, -2, -2); // a 2-px margin is considered at FolderView::updateGridSize()
for(;;) {
QTextLine line = layout.createLine();
if(!line.isValid())
break;
line.setLineWidth(textRect.width());
height += opt.fontMetrics.leading();
line.setPosition(QPointF(0, height));
if((height + line.height() + textRect.y()) > textRect.bottom()) {
// if part of this line falls outside the textRect, ignore it and quit.
QTextLine lastLine = layout.lineAt(visibleLines - 1);
elidedText = opt.text.mid(lastLine.textStart());
elidedText = opt.fontMetrics.elidedText(elidedText, opt.textElideMode, textRect.width());
break;
}
height += line.height();
width = qMax(width, line.naturalTextWidth());
++ visibleLines;
}
layout.endLayout();
width = qMax(width, (qreal)opt.fontMetrics.width(elidedText));
QRectF boundRect = layout.boundingRect();
boundRect.setWidth(width);
boundRect.setHeight(height);
boundRect.moveTo(textRect.x() + (textRect.width() - width)/2, textRect.y());
QRectF selRect = boundRect.adjusted(-2, -2, 2, 2);
if(!painter) { // no painter, calculate the bounding rect only
textRect = selRect;
return;
}
if((opt.state & QStyle::State_Selected) && opt.widget) {
QPalette palette = opt.widget->palette();
// qDebug("w: %f, h:%f, m:%f", boundRect.width(), boundRect.height(), layout.minimumWidth());
painter->fillRect(selRect, palette.highlight());
}
else { // only draw shadow for non-selected items
// draw shadow, FIXME: is it possible to use QGraphicsDropShadowEffect here?
QPen prevPen = painter->pen();
painter->setPen(QPen(shadowColor_));
for(int i = 0; i < visibleLines; ++i) {
QTextLine line = layout.lineAt(i);
if(i == (visibleLines - 1) && !elidedText.isEmpty()) { // the last line, draw elided text
QPointF pos(boundRect.x() + line.position().x() + 1, boundRect.y() + line.y() + line.ascent() + 1);
painter->drawText(pos, elidedText);
}
else {
line.draw(painter, textRect.topLeft() + QPointF(1, 1));
}
}
painter->setPen(prevPen);
}
// draw text
for(int i = 0; i < visibleLines; ++i) {
QTextLine line = layout.lineAt(i);
if(i == (visibleLines - 1) && !elidedText.isEmpty()) { // the last line, draw elided text
QPointF pos(boundRect.x() + line.position().x(), boundRect.y() + line.y() + line.ascent());
painter->drawText(pos, elidedText);
}
else {
line.draw(painter, textRect.topLeft());
}
}
}
QSize DesktopItemDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const {
QVariant value = index.data(Qt::SizeHintRole);
if(value.isValid())
return qvariant_cast<QSize>(value);
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
opt.decorationAlignment = Qt::AlignHCenter|Qt::AlignTop;
opt.displayAlignment = Qt::AlignTop|Qt::AlignHCenter;
QSize gridSize = view_->gridSize()
- QSize(6, 6); // a 6-px margin is added at FolderView::updateGridSize()
Q_ASSERT(gridSize != QSize());
QRectF textRect(0, 0, gridSize.width(), gridSize.height() - opt.decorationSize.height());
drawText(NULL, opt, textRect); // passing NULL for painter will calculate the bounding rect only.
int width = qMax((int)textRect.width(), opt.decorationSize.width());
int height = opt.decorationSize.height() + textRect.height();
return QSize(width, height);
}
DesktopItemDelegate::~DesktopItemDelegate() {
}
} // namespace PCManFM