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pcmanfm-qt-packaging/libfm-qt/folderitemdelegate.cpp

217 lines
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/*
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 "folderitemdelegate.h"
#include "foldermodel.h"
#include <QPainter>
#include <QModelIndex>
#include <QStyleOptionViewItemV4>
#include <QApplication>
#include <QIcon>
#include <QTextLayout>
#include <QTextOption>
#include <QTextLine>
#include <QDebug>
namespace Fm {
FolderItemDelegate::FolderItemDelegate(QAbstractItemView* view, QObject* parent):
QStyledItemDelegate(parent ? parent : view),
symlinkIcon_(QIcon::fromTheme("emblem-symbolic-link")),
view_(view) {
}
FolderItemDelegate::~FolderItemDelegate() {
}
QSize FolderItemDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const {
QVariant value = index.data(Qt::SizeHintRole);
if(value.isValid())
return qvariant_cast<QSize>(value);
if(option.decorationPosition == QStyleOptionViewItem::Top ||
option.decorationPosition == QStyleOptionViewItem::Bottom) {
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
opt.decorationAlignment = Qt::AlignHCenter|Qt::AlignTop;
opt.displayAlignment = Qt::AlignTop|Qt::AlignHCenter;
// FIXME: there're some problems in this size hint calculation.
Q_ASSERT(gridSize_ != QSize());
QRectF textRect(0, 0, gridSize_.width() - 4, gridSize_.height() - opt.decorationSize.height() - 4);
drawText(NULL, opt, textRect); // passing NULL for painter will calculate the bounding rect only.
int width = qMax((int)textRect.width(), opt.decorationSize.width()) + 4;
int height = opt.decorationSize.height() + textRect.height() + 4;
return QSize(width, height);
}
return QStyledItemDelegate::sizeHint(option, index);
}
QIcon::Mode FolderItemDelegate::iconModeFromState(QStyle::State state) {
QIcon::Mode iconMode;
if(state & QStyle::State_Enabled) {
if(state & QStyle::State_Selected)
iconMode = QIcon::Selected;
else {
iconMode = QIcon::Normal;
}
}
else
iconMode = QIcon::Disabled;
return iconMode;
}
// special thanks to Razor-qt developer Alec Moskvin(amoskvin) for providing the fix!
void FolderItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {
Q_ASSERT(index.isValid());
FmFileInfo* file = static_cast<FmFileInfo*>(index.data(FolderModel::FileInfoRole).value<void*>());
bool isSymlink = file && fm_file_info_is_symlink(file);
if(option.decorationPosition == QStyleOptionViewItem::Top ||
option.decorationPosition == QStyleOptionViewItem::Bottom) {
painter->save();
painter->setClipRect(option.rect);
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
opt.decorationAlignment = Qt::AlignHCenter|Qt::AlignTop;
opt.displayAlignment = Qt::AlignTop|Qt::AlignHCenter;
// draw the icon
QIcon::Mode iconMode = iconModeFromState(opt.state);
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
if(isSymlink)
painter->drawPixmap(iconPos, symlinkIcon_.pixmap(opt.decorationSize / 2, iconMode));
// draw the text
QRectF textRect(opt.rect.x(), opt.rect.y() + opt.decorationSize.height(), opt.rect.width(), opt.rect.height() - opt.decorationSize.height());
drawText(painter, opt, textRect);
painter->restore();
}
else {
// let QStyledItemDelegate does its default painting
QStyledItemDelegate::paint(painter, option, index);
// draw emblems if needed
if(isSymlink) {
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
QIcon::Mode iconMode = iconModeFromState(opt.state);
QPoint iconPos(opt.rect.x(), opt.rect.y() + (opt.rect.height() - opt.decorationSize.height()) / 2);
// draw some emblems for the item if needed
// we only support symlink emblem at the moment
painter->drawPixmap(iconPos, symlinkIcon_.pixmap(opt.decorationSize / 2, iconMode));
}
}
}
// if painter is NULL, the method calculate the bounding rectangle of the text and save it to textRect
void FolderItemDelegate::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;
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());
if(visibleLines == 1) // this is the only visible line
width = textRect.width();
break;
}
height += line.height();
width = qMax(width, line.naturalTextWidth());
++ visibleLines;
}
layout.endLayout();
// draw background for selected item
QRectF boundRect = layout.boundingRect();
//qDebug() << "bound rect: " << boundRect << "width: " << width;
boundRect.setWidth(width);
boundRect.moveTo(textRect.x() + (textRect.width() - width)/2, textRect.y());
if(!painter) { // no painter, calculate the bounding rect only
textRect = boundRect;
return;
}
QPalette::ColorGroup cg = opt.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
if(opt.state & QStyle::State_Selected) {
painter->fillRect(boundRect, opt.palette.highlight());
painter->setPen(opt.palette.color(cg, QPalette::HighlightedText));
}
else
painter->setPen(opt.palette.color(cg, QPalette::Text));
// 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(textRect.x() + line.position().x(), textRect.y() + line.y() + line.ascent());
painter->drawText(pos, elidedText);
}
else {
line.draw(painter, textRect.topLeft());
}
}
if(opt.state & QStyle::State_HasFocus) {
// draw focus rect
QStyleOptionFocusRect o;
o.QStyleOption::operator=(opt);
o.rect = boundRect.toRect(); // subElementRect(SE_ItemViewItemFocusRect, vopt, widget);
o.state |= QStyle::State_KeyboardFocusChange;
o.state |= QStyle::State_Item;
QPalette::ColorGroup cg = (opt.state & QStyle::State_Enabled)
? QPalette::Normal : QPalette::Disabled;
o.backgroundColor = opt.palette.color(cg, (opt.state & QStyle::State_Selected)
? QPalette::Highlight : QPalette::Window);
if (const QWidget* widget = opt.widget) {
QStyle* style = widget->style() ? widget->style() : qApp->style();
style->drawPrimitive(QStyle::PE_FrameFocusRect, &o, painter, widget);
}
}
}
} // namespace Fm