1

我的代码如下。用鼠标点击项目后，我想要一个复选框被选中并显示指定位置的背景并设置复选框希望有人给一个好的建议，谢谢

jobDialog::jobDialog(QWidget *parent) : QDialog(parent), ui(new Ui::jobDialog)
{
        ui->setupUi(this);
        ui->listWidget->setViewMode(QListView::IconMode);//
        ui->listWidget->setIconSize(QSize(300, 300));
        ui->listWidget->setSpacing(10);
        ui->listWidget->setResizeMode(QListWidget::Adjust);
        ui->listWidget->setMovement(QListWidget::Static);

        connect(ui->listWidget, SIGNAL(itemClicked(QListWidgetItem *)), this,
            SLOT(getItems(QListWidgetItem *)));

        int n = 10;
        for (int i = 0; i < n; i++) {

            QListWidgetItem *newItem = new QListWidgetItem(
                QIcon(":/res/images/video.png"), " iamges");
            newItem->setSizeHint(QSize(140, 130)); 

            newItem->setTextAlignment(Qt::AlignCenter);;

            ui->listWidget->addItem(newItem);
        }
}

void jobDialog::getItems(QListWidgetItem *item)
{   

        for (int i = 0; i < 10; i++) {
        if (ui->listWidget->item(i) == item) {

        }
    }
}

4

1 回答 1

1

要在项目上绘制复选框，您可以通过启用项目的选中属性来使用 QProxyStyle，复选框的状态通过委托更改：

代理样式.h

#ifndef PROXYSTYLE_H
#define PROXYSTYLE_H

#include <QPainter>
#include <QProxyStyle>
#include <QStyleOptionViewItem>

class ProxyStyle: public QProxyStyle{
public:
    using QProxyStyle::QProxyStyle;
    void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p, const QWidget *w) const{
        QProxyStyle::drawControl(element, opt, p, w);
        if(element == QStyle::CE_ItemViewItem){
            if(const QStyleOptionViewItem *vopt = qstyleoption_cast<const QStyleOptionViewItem *>(opt)){
                if(vopt->checkState == Qt::Checked)
                    drawCheckBox(*vopt, p);
            }
        }
    }
private:
    void drawCheckBox(const QStyleOptionViewItem & option, QPainter *painter) const{
        QIcon::Mode mode = QIcon::Normal;
        if (!(option.state & QStyle::State_Enabled))
            mode = QIcon::Disabled;
        else if (option.state & QStyle::State_Selected)
            mode = QIcon::Selected;
        QIcon::State state = option.state & QStyle::State_Open ? QIcon::On : QIcon::Off;
        // load icon
        QIcon icon = standardIcon(QStyle::SP_DialogApplyButton);
        // or QIcon icon("/path/of/icon");
        const int size = 16;
        const int margin = 10;
        painter->save();
        QRect iconRect = QRect(option.rect.bottomRight() - (size + margin) * QPoint(1, 1), size * QSize(1, 1));
        icon.paint(painter, iconRect, Qt::AlignCenter, mode, state);
        painter->restore();
    }
};

#endif // PROXYSTYLE_H

styleditemdelegate.h

#ifndef STYLEDITEMDELEGATE_H
#define STYLEDITEMDELEGATE_H

#include <QEvent>
#include <QMouseEvent>
#include <QStyledItemDelegate>

class StyledItemDelegate: public QStyledItemDelegate{
public:
    using QStyledItemDelegate::QStyledItemDelegate;
    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index){
        Qt::ItemFlags flags = model->flags(index);
        if (!(flags & Qt::ItemIsUserCheckable) || !(option.state & QStyle::State_Enabled)
                || !(flags & Qt::ItemIsEnabled))
            return false;
        QVariant value = index.data(Qt::CheckStateRole);
        if (!value.isValid())
            return false;
        if ((event->type() == QEvent::MouseButtonRelease)
                || (event->type() == QEvent::MouseButtonDblClick)
                || (event->type() == QEvent::MouseButtonPress)) {
            if ((event->type() == QEvent::MouseButtonPress)
                    || (event->type() == QEvent::MouseButtonDblClick))
                return true;
            Qt::CheckState state = static_cast<Qt::CheckState>(value.toInt());
            if (flags & Qt::ItemIsUserTristate)
                state = ((Qt::CheckState)((state + 1) % 3));
            else
                state = (state == Qt::Checked) ? Qt::Unchecked : Qt::Checked;
            return model->setData(index, state, Qt::CheckStateRole);
        }
        return false; //QStyledItemDelegate::editorEvent(event, model, option, index);
    }
protected:
    void initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const{
        QStyledItemDelegate::initStyleOption(option, index);
        // disable draw checkbox
        option->features &= ~QStyleOptionViewItem::HasCheckIndicator;
    }
};

#endif // STYLEDITEMDELEGATE_H

// ...
#include "proxystyle.h"
#include "styleditemdelegate.h"
// ...

jobDialog::jobDialog(QWidget *parent) : QDialog(parent), ui(new Ui::jobDialog)
{
    ui->setupUi(this);
    ui->listWidget->setViewMode(QListView::IconMode);//
    ui->listWidget->setIconSize(QSize(300, 300));
    ui->listWidget->setSpacing(10);
    ui->listWidget->setResizeMode(QListWidget::Adjust);
    ui->listWidget->setMovement(QListWidget::Static);

    ui->listWidget->setStyle(new ProxyStyle(ui->listWidget->style()));
    ui->listWidget->setItemDelegate(new StyledItemDelegate(ui->listWidget));

    int n = 10;
    for (int i = 0; i < n; i++) {
        QListWidgetItem *newItem = new QListWidgetItem(QIcon(":/res/images/video.png"), "");
        newItem->setSizeHint(QSize(140, 130)); 
        newItem->setTextAlignment(Qt::AlignCenter);
        newItem->setFlags(item->flags() | Qt::ItemIsUserCheckable);
        newItem->setCheckState(Qt::Unchecked);
        ui->listWidget->addItem(newItem);
    }

}
于 2019-12-26T19:13:08.427 回答