问题
I want to have a QTreeView
without an indentation on the left side increasing at each nesting level. I tried setting QTreeView::setIndentation(0)
. It removes the indentations just as I want, however it also hides the tree arrows.
Default behavior:
- With indentations ✗
- With arrows ✔
After setIndentation(0)
:
- Without indentations ✔
- Without arrows ✗
Desired behavior:
- Without indentations ✔
- With arrows ✔
So how can I achieve the result shown in the third example? Is there any standard way of doing it, or I will have to reimplement the QTreeView::paintEvent()
, QTreeView::drawBranches()
, etc.?
回答1:
To solve the problem I used a delegate to translate the paint of the items, and paint the arrows.
#include <QtWidgets>
class BranchDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QStyleOptionViewItem opt(option);
if(index.column() == 0)
opt.rect.adjust(opt.rect.height(), 0, 0, 0);
QStyledItemDelegate::paint(painter, opt, index);
if(index.column() == 0){
QStyleOptionViewItem branch;
branch.rect = QRect(0, opt.rect.y(), opt.rect.height(), opt.rect.height());
branch.state = option.state;
const QWidget *widget = option.widget;
QStyle *style = widget ? widget->style() : QApplication::style();
style->drawPrimitive(QStyle::PE_IndicatorBranch, &branch, painter, widget);
}
}
};
class TreeView: public QTreeView
{
public:
TreeView(QWidget *parent=nullptr):QTreeView(parent)
{
BranchDelegate *delegate = new BranchDelegate(this);
setItemDelegate(delegate);
setIndentation(0);
}
protected:
void mousePressEvent(QMouseEvent *event) override{
QModelIndex index = indexAt(event->pos());
bool last_state = isExpanded(index);
QTreeView::mousePressEvent(event);
if(index.isValid() && last_state == isExpanded(index))
setExpanded(index, !last_state);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TreeView w;
QFileSystemModel model;
model.setRootPath(QDir::rootPath());
w.setModel(&model);
w.setRootIndex(model.index(QDir::homePath()));
/*for (int i = 1; i< model.columnCount() ; ++i) {
w.hideColumn(i);
}*/
w.expandAll();
w.resize(640, 480);
w.show();
return a.exec();
}
来源:https://stackoverflow.com/questions/55969916/how-to-remove-qtreeview-indentation