更新代码

other/multobj2slot/widget.cpp

@@ -0,0 +1,70 @@
+#include "widget.h"
+#include "ui_widget.h"
+#include "qpushbutton.h"
+#include "qsignalmapper.h"
+#include "qdatetime.h"
+#include "qdebug.h"
+
+#define TIMEMS QTime::currentTime().toString("hh:mm:ss zzz")
+Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+    this->initBtn();
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+
+void Widget::initBtn()
+{
+    QSignalMapper *signMap = new QSignalMapper(this);
+    connect(signMap, SIGNAL(mapped(QString)), this, SLOT(doBtn(QString)));
+
+    int x = 5, y = -25;
+    for (int i = 0; i < 1000; ++i) {
+        //动态设置坐标
+        x += 80;
+        if (i % 10 == 0) {
+            x = 5;
+            y += 30;
+        }
+
+        QPushButton *btn = new QPushButton(this);
+        btn->setObjectName(QString("btn_%1").arg(i + 1));
+        btn->setText(QString("text_%1").arg(i + 1));
+        btn->setGeometry(x, y, 75, 25);
+
+        //方法0: 每个按钮关联到一个独立的槽,代码量大不可取放弃
+        //方式1: 绑定到一个槽函数
+        connect(btn, SIGNAL(clicked(bool)), this, SLOT(doBtn()));
+        //方式2: 通过 QSignalMapper 转发信号
+        connect(btn, SIGNAL(clicked(bool)), signMap, SLOT(map()));
+        signMap->setMapping(btn, btn->objectName());
+        //方法3: 用 lambda 表达式
+#if (QT_VERSION >= QT_VERSION_CHECK(5,6,0))
+        connect(btn, &QPushButton::clicked, [btn] {
+            QString name = btn->objectName();
+            qDebug() << TIMEMS << "doBtn3" << name;
+        });
+
+        connect(btn, &QPushButton::clicked, [=]() {
+            QString name = btn->objectName();
+            qDebug() << TIMEMS << "doBtn3" << name;
+        });
+#endif
+    }
+}
+
+void Widget::doBtn()
+{
+    QPushButton *btn = (QPushButton *)sender();
+    QString name = btn->objectName();
+    qDebug() << TIMEMS << "doBtn1" << name;
+}
+
+void Widget::doBtn(const QString &name)
+{
+    qDebug() << TIMEMS << "doBtn2" << name;
+}