// set proper grid size for the QListView based on current view mode, icon size, and font size.
void FolderView::updateGridSize() {
if(mode == DetailedListMode || !view)
return;
FolderViewListView* listView = static_cast<FolderViewListView*>(view);
QSize icon = iconSize(mode); // size of the icon
QFontMetrics fm = fontMetrics(); // size of current font
QSize grid; // the final grid size
switch(mode) {
case IconMode:
case ThumbnailMode: {
// NOTE by PCMan about finding the optimal text label size:
// The average filename length on my root filesystem is roughly 18-20 chars.
// So, a reasonable size for the text label is about 10 chars each line since string of this length
// can be shown in two lines. If you consider word wrap, then the result is around 10 chars per word.
// In average, 10 char per line should be enough to display a "word" in the filename without breaking.
// The values can be estimated with this command:
// > find / | xargs basename -a | sed -e s'/[_-]/ /g' | wc -mcw
// However, this average only applies to English. For some Asian characters, such as Chinese chars,
// each char actually takes doubled space. To be safe, we use 13 chars per line x average char width
// to get a nearly optimal width for the text label. As most of the filenames have less than 40 chars
// 13 chars x 3 lines should be enough to show the full filenames for most files.
int textWidth = fm.averageCharWidth() * 13;
int textHeight = fm.lineSpacing() * 3;
grid.setWidth(qMax(icon.width(), textWidth) + 4); // a margin of 2 px for selection rects
grid.setHeight(icon.height() + textHeight + 4); // a margin of 2 px for selection rects
break;
}
default:
; // do not use grid size
}
if(mode == IconMode || mode == ThumbnailMode)
listView->setGridSize(grid + QSize(6, 6)); // a margin of 6 px for every cell
else
listView->setGridSize(grid);
FolderItemDelegate* delegate = static_cast<FolderItemDelegate*>(listView->itemDelegateForColumn(FolderModel::ColumnFileName));
delegate->setGridSize(grid);
}
void FolderView::setViewMode(ViewMode _mode) {
if(_mode == mode) // if it's the same more, ignore
return;
// FIXME: retain old selection
// since only detailed list mode uses QTreeView, and others
// all use QListView, it's wise to preserve QListView when possible.
bool recreateView = false;
if(view && (mode == DetailedListMode || _mode == DetailedListMode)) {
delete view; // FIXME: no virtual dtor?
view = NULL;
recreateView = true;
}
mode = _mode;
QSize iconSize = iconSize_[mode - FirstViewMode];
if(mode == DetailedListMode) {
FolderViewTreeView* treeView = new FolderViewTreeView(this);
view = treeView;
treeView->setItemsExpandable(false);
treeView->setRootIsDecorated(false);
treeView->setAllColumnsShowFocus(false);
// set our own custom delegate
FolderItemDelegate* delegate = new FolderItemDelegate(treeView);
treeView->setItemDelegateForColumn(FolderModel::ColumnFileName, delegate);
}
else {
FolderViewListView* listView;
if(view)
listView = static_cast<FolderViewListView*>(view);
else {
listView = new FolderViewListView(this);
view = listView;
}
// set our own custom delegate
FolderItemDelegate* delegate = new FolderItemDelegate(listView);
listView->setItemDelegateForColumn(FolderModel::ColumnFileName, delegate);
// FIXME: should we expose the delegate?
listView->setMovement(QListView::Static);
listView->setResizeMode(QListView::Adjust);
listView->setWrapping(true);
switch(mode) {
case IconMode: {
listView->setViewMode(QListView::IconMode);
// listView->setGridSize(QSize(iconSize.width() * 1.6, iconSize.height() * 2));
listView->setGridSize(QSize(90, 110));
listView->setWordWrap(true);
listView->setFlow(QListView::LeftToRight);
break;
}
case CompactMode: {
listView->setViewMode(QListView::ListMode);
listView->setGridSize(QSize());
listView->setWordWrap(false);
listView->setFlow(QListView::QListView::TopToBottom);
break;
}
case ThumbnailMode: {
listView->setViewMode(QListView::IconMode);
listView->setGridSize(QSize(160, 160));
listView->setWordWrap(true);
listView->setFlow(QListView::LeftToRight);
break;
}
default:;
}
delegate->setGridSize(listView->gridSize());
}
if(view) {
// we have to install the event filter on the viewport instead of the view itself.
view->viewport()->installEventFilter(this);
// we want the QEvent::HoverMove event for single click + auto-selection support
view->viewport()->setAttribute(Qt::WA_Hover, true);
connect(view, SIGNAL(activatedFiltered(QModelIndex)), SLOT(onItemActivated(QModelIndex)));
view->setContextMenuPolicy(Qt::NoContextMenu); // defer the context menu handling to parent widgets
view->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
view->setIconSize(iconSize);
view->setSelectionMode(QAbstractItemView::ExtendedSelection);
layout()->addWidget(view);
// enable dnd
view->setDragEnabled(true);
view->setAcceptDrops(true);
view->setDragDropMode(QAbstractItemView::DragDrop);
view->setDropIndicatorShown(true);
if(model_) {
// FIXME: preserve selections
model_->setThumbnailSize(iconSize.width());
view->setModel(model_);
if(recreateView)
connect(view->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)), SLOT(onSelectionChanged(QItemSelection,QItemSelection)));
}
}
}
