每次按下“添加客户端”按钮时,减号按钮、客户端名称、客户端计数器和加号按钮都会以水平线添加到网格布局中。我想在按下加号/减号按钮时更新计数(QLabel)。
这是我的代码:
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QGridLayout>
#include <QLabel>
int row = 0;
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
}
Widget::~Widget()
{
delete ui;
}
void Widget::on_pushButton_clicked()
{
QPushButton* minus_button = new QPushButton();
QPushButton* plus_button = new QPushButton();
minus_button->setText("-");
plus_button->setText("+");
QLabel* client_name = new QLabel(ui->lineEdit->text(), this);
QLabel* client_count = new QLabel("", this);
ui->gridLayout->addWidget(minus_button, row, 1, Qt::AlignTop|Qt::AlignHCenter);
ui->gridLayout->addWidget(client_name, row, 2, Qt::AlignTop|Qt::AlignHCenter);
ui->gridLayout->addWidget(client_count, row, 3, Qt::AlignTop|Qt::AlignHCenter);
ui->gridLayout->addWidget(plus_button, row++, 4, Qt::AlignTop|Qt::AlignHCenter);
connect(minus_button, SIGNAL(clicked(bool)), this, SLOT(minusCount()));
connect(plus_button, SIGNAL(clicked(bool)), this, SLOT(plusCount()));
}
void Widget::minusCount(){
//Here I want to somehow reference the client_count label which is in the same row
}
void Widget::plusCount(){
//Here I want to somehow reference the client_count label which is in the same row
}
编辑:在凯文发表评论之后,这里是任何可能需要它的人的工作代码。
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QGridLayout>
#include <QLabel>
#include <QSignalMapper>
QSignalMapper* m_minusMapper;
QSignalMapper* m_plusMapper;
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
m_minusMapper = new QSignalMapper(this);
connect(m_minusMapper, SIGNAL(mapped(QWidget*)), this, SLOT(minusCount(QWidget*)));
m_plusMapper = new QSignalMapper(this);
connect(m_plusMapper, SIGNAL(mapped(QWidget*)), this, SLOT(plusCount(QWidget*)));
}
Widget::~Widget()
{
delete ui;
}
void Widget::on_pushButton_clicked()
{
QPushButton* minus_button = new QPushButton();
minus_button->setObjectName("minus" + QString::number(row));
minus_button->setText("-");
QPushButton* plus_button = new QPushButton();
plus_button->setObjectName("plus" + QString::number(row));
plus_button->setText("+");
QLabel* client_name = new QLabel(ui->lineEdit->text(), this);
QLabel* client_count = new QLabel("0", this);
ui->gridLayout->addWidget(minus_button, row, 1, Qt::AlignVCenter|Qt::AlignHCenter);
ui->gridLayout->addWidget(client_name, row, 2, Qt::AlignVCenter|Qt::AlignHCenter);
ui->gridLayout->addWidget(client_count, row, 3, Qt::AlignVCenter|Qt::AlignHCenter);
ui->gridLayout->addWidget(plus_button, row++, 4, Qt::AlignVCenter|Qt::AlignHCenter);
connect(minus_button, SIGNAL(clicked()), m_minusMapper, SLOT(map()));
connect(plus_button, SIGNAL(clicked()), m_plusMapper, SLOT(map()));
m_minusMapper->setMapping(minus_button, client_count);
m_plusMapper->setMapping(plus_button, client_count);
}
void Widget::minusCount(QWidget *widget)
{
QLabel *client_count = qobject_cast<QLabel*>(widget);
QString initCount = client_count->text();
int newCount = initCount.toInt() - 1;
client_count->setText(QString::number(newCount));
}
void Widget::plusCount(QWidget *widget)
{
QLabel *client_count = qobject_cast<QLabel*>(widget);
QString initCount = client_count->text();
int newCount = initCount.toInt() + 1;
client_count->setText(QString::number(newCount));
}