我需要一个可检查的QAction
,它除了已检查和未检查的模式外,还具有部分检查的选项。这基本上已经是QCheckBox所提供的,但是不幸的是QAction没有提供。
作为第一步,我通过实现自定义QWidgetAction
提出了以下方法。
TriState.h
#pragma once
#include <QWidgetAction>
#include <QCheckBox>
#include <QLabel>
#include <QFrame>
#include <QHBoxLayout>
class TriStateAction : public QWidgetAction {
Q_OBJECT
public:
TriStateAction(QWidget* parent=nullptr) : QWidgetAction(parent) {
mChkBox = new QCheckBox;
mChkBox->setTristate(true);
auto widget = new QFrame;
widget->setLayout(new QHBoxLayout);
widget->layout()->addWidget(mChkBox);
widget->layout()->addWidget(new QLabel("TriState"));
setDefaultWidget(widget);
connect(mChkBox, &QCheckBox::stateChanged, this, &QWidgetAction::changed);
}
void setCheckState(Qt::CheckState checkState) {
mChkBox->setCheckState(checkState);
}
Qt::CheckState checkState() const {
return mChkBox->checkState();
}
private:
QCheckBox* mChkBox{ nullptr };
};
有了这个简单的TestRunner:
main.cpp
#include <QApplication>
#include <QMenu>
#include <QAction>
#include "TriStateAction.h"
int main(int argc, char** args) {
QApplication app(argc, args);
auto label=new QLabel("Test");
label->setContextMenuPolicy(Qt::ContextMenuPolicy::CustomContextMenu);
label->connect(label, &QLabel::customContextMenuRequested, [&](const QPoint& point) {
QMenu menu(label);
auto globalPoint = label->mapToGlobal(point);
auto triStateAction = new TriStateAction();
auto normalAction = new QAction("Check");
normalAction->setCheckable(true);
normalAction->setChecked(true);
menu.addAction(triStateAction);
menu.addAction(normalAction);
menu.exec(globalPoint);
});
label->show();
app.exec();
}
现在,上下文菜单弹出,我可以很高兴地检查,取消选中和部分检查我的TriState Action。但是,与普通的QAction不同,TriState在交互时不会关闭菜单。这怎么办?
另一个问题是我的《 TriState动作》的布局(视觉表示)不同。与普通的QAction相比,如何使其更相似? (实际上,这似乎是一个非常困难的问题。)
答案 0 :(得分:1)
让 action 知道其菜单,并在您的PdfDocument GlobalPdfDocument = new PdfDocument(new PdfWriter(multiContentPdf));
PdfWriter Writer = new PdfWriter(memStreamOfAddressAndBarcode);
Writer.SetCloseStream(false); // Prevent the Writer from closing the MemoryStream
PdfDocument InitialPdfDoc = new PdfDocument(Writer);
InitialPdfDoc.AddNewPage();
InitialPdfDoc.Close(); // Closing the document finishes the result PDF
memStreamOfAddressAndBarcode.Position = 0; // Re-position the stream to the start of the PDF
InitialPdfDoc = new PdfDocument(new PdfReader(memStreamOfAddressAndBarcode)); // Create r/o document
InitialPdfDoc.CopyPagesTo(1, InitialPdfDoc.GetNumberOfPages(), GlobalPdfDocument);
中添加以下行:
foreach ($data["results"] as $row) {
if ( $this->session->get_userdata('sessiondata')['maxid'] > $row->id)
$this->session->unset_userdata('maxid');
$this->session->set_userdata('maxid',$row->id);
echo "new value".$this->session->get_userdata('sessiondata')['maxid'];
}
在main
类中,添加一个插槽以捕获复选框triStateAction->setMenu(&menu);
信号,然后从此处关闭菜单:
TriStateAction
不要忘记在stateChanged
构造函数中连接插槽:
private slots:
void checkBoxStateChanged(int)
{
if (menu() != nullptr)
{
menu()->close();
}
}