QListView不使用委托的大小提示
我有一个呈现自定义项目委托的 QListView。我重写委托的 sizeHint() 来提供大小，但列表视图似乎没有考虑到这一点。下面是我正在使用的代码：
CardItemDelegate.h
#ifndef CARDITEMDELEGATE_H
#define CARDITEMDELEGATE_H
class CardItemDelegate : public QStyledItemDelegate {
Q_OBJECT
public:
explicit CardItemDelegate(QObject *parent = 0);
QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index);
void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const;
};
#endif // CARDITEMDELEGATE_H
CardItemDelegate.cpp
#include "CardItemDelegate.h"
CardItemDelegate::CardItemDelegate(QObject *parent) : QStyledItemDelegate(parent) {
}
QSize CardItemDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) {
qDebug() << "size hint called";
return QSize(100, 30);
}
void CardItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {
painter->save();
painter->setBrush(Qt::green);
painter->setPen(Qt::red);
painter->drawRect(option.rect);
painter->restore();
}
这就是我使用它的方式：
DeckListModel* model = new DeckListModel();
ui->deckListView->setModel(model);
ui->deckListView->setItemDelegate(new CardItemDelegate());
项目在列表视图中正确显示，但是 < code>sizeHint() 从未被调用（我已在调用中添加了调试语句以进行检查），因此项目的大小不正确。有人能看出可能是什么问题吗？
I have a QListView that renders custom item delegates. I am overriding sizeHint() of the delegate to provide the size but it seems the list view doesn't take this into account. Below is the code I'm using:
CardItemDelegate.h
#ifndef CARDITEMDELEGATE_H
#define CARDITEMDELEGATE_H
class CardItemDelegate : public QStyledItemDelegate {
Q_OBJECT
public:
explicit CardItemDelegate(QObject *parent = 0);
QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index);
void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const;
};
#endif // CARDITEMDELEGATE_H
CardItemDelegate.cpp
#include "CardItemDelegate.h"
CardItemDelegate::CardItemDelegate(QObject *parent) : QStyledItemDelegate(parent) {
}
QSize CardItemDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) {
qDebug() << "size hint called";
return QSize(100, 30);
}
void CardItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {
painter->save();
painter->setBrush(Qt::green);
painter->setPen(Qt::red);
painter->drawRect(option.rect);
painter->restore();
}
And this is how I'm using it:
DeckListModel* model = new DeckListModel();
ui->deckListView->setModel(model);
ui->deckListView->setItemDelegate(new CardItemDelegate());
The items are displayed properly in the list view however sizeHint() is never called (I've added a debug statement to the call to check) so the items don't have the right size. Can anybody see what could be the issue?
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评论（1）
这是因为签名不匹配。您错过了签名末尾的
const（滚动代码）。应该是
it's because of signature mismatch. You missed
constat the end of the signatute (scroll code).Should be