func：添加key字段重复检测。

MainWidget.cpp

@@ -11,7 +11,7 @@ MainWidget::MainWidget(QWidget* parent) : QWidget(parent), ui(new Ui::MainWidget
 {
     ui->setupUi(this);
 
-    setWindowTitle(u8"OneLevelXmlOpr v1.2.2");
+    setWindowTitle(u8"OneLevelXmlOpr v1.2.3");
     setWindowIcon(QIcon("://resource/xml.ico"));
 
     setMinimumWidth(900);
@@ -38,7 +38,10 @@ MainWidget::MainWidget(QWidget* parent) : QWidget(parent), ui(new Ui::MainWidget
     connect(ui->btnDelSelectLine, &QPushButton::clicked, this, [&]() { del_select_line(); });
     connect(ui->btnExit, &QPushButton::clicked, this, [&]() { QApplication::exit(0); });
     connect(ui->btnReset, &QPushButton::clicked, this, &MainWidget::reset);
-    connect(ui->btnEditProperty, &QPushButton::clicked, this, &MainWidget::edit_property);
+    connect(ui->btnEditProperty, &QPushButton::clicked, this, [&]() {
+        Element_t* ele = get_current_select_key();
+        edit_property(ele);
+    });
     connect(ui->btnPagePre, &QPushButton::clicked, this, [&]() {
         unsigned int cur = ui->edCurPage->text().toUInt();
         push_content(current_, cur - 1);
@@ -75,24 +78,6 @@ void MainWidget::copy_key()
     CUtil::msg(this, u8"已复制");
 }
 
-void MainWidget::edit_property()
-{
-    Element_t* target = get_current_select_key();
-    if (target == nullptr) {
-        return;
-    }
-    Property_t property;
-    xml_.get_key_value(target, property);
-    attri_edit_->set_attribute(property, false);
-    attri_edit_->exec();
-
-    if (!attri_edit_->is_ok_) {
-        return;
-    }
-    attri_edit_->get_attribute(property);
-    xml_.key_value_to_element(target, property);
-}
-
 void MainWidget::closeEvent(QCloseEvent* event)
 {
     QSettings settings;
@@ -104,8 +89,7 @@ void MainWidget::closeEvent(QCloseEvent* event)
 
 void MainWidget::keyPressEvent(QKeyEvent* event)
 {
-    switch (event->key())
-    {
+    switch (event->key()) {
     case Qt::Key_Return:
         search();
         break;
@@ -325,18 +309,10 @@ void MainWidget::copy_select_line()
     }
     Element_t* newer = xml_.copy_element(target);
 
-    Property_t property;
-    xml_.get_key_value(newer, property);
-
-    attri_edit_->set_attribute(property);
-    attri_edit_->exec();
-
-    if (!attri_edit_->is_ok_) {
+    if (!edit_property(newer)) {
         return;
     }
 
-    attri_edit_->get_attribute(property);
-    xml_.key_value_to_element(newer, property);
     xml_.insert_brother_node(target, newer);
 
     tab_widget_->insertRow(cur_item->row() + 1);
@@ -353,6 +329,36 @@ void MainWidget::copy_select_line()
     search();
 }
 
+// 返回 true 表示确认编辑了， false 表示取消编辑了。
+bool MainWidget::edit_property(Element_t* target)
+{
+    if (target == nullptr) {
+        return false;
+    }
+
+    Property_t property;
+    xml_.get_key_value(target, property);
+
+    attri_edit_->set_attribute(property);
+    attri_edit_->exec();
+
+    if (!attri_edit_->is_ok_) {
+        return false;
+    }
+
+    attri_edit_->get_attribute(property);
+    while (xml_.check_key_exists(property)) {
+        CUtil::msg(attri_edit_, u8"不能有相同的key，请检查。");
+        attri_edit_->exec();
+        attri_edit_->get_attribute(property);
+        if (!attri_edit_->is_ok_) {
+            return false;
+        }
+    }
+    xml_.key_value_to_element(target, property);
+    return true;
+}
+
 void MainWidget::insert_one_line(Element_t* ele, int row)
 {
     if (ele == nullptr) {