Add QClearLineEdit.

Which emits 'returnPressed' on clear action.

src/CMakeLists.txt

@@ -88,6 +88,7 @@ set(HEADER_FILES
     QDetachTabWidget.h
     QZoomChartView.h
     QZoomChart.h
+    QClearLineEdit.h
     )
 
 set(SOURCE_FILES
@@ -161,6 +162,7 @@ set(SOURCE_FILES
     QDetachTabWidget.cpp
     QZoomChartView.cpp
     QZoomChart.cpp
+    QClearLineEdit.cpp
     )
 
 qt5_add_resources(SOURCE_FILES resource.qrc)

src/QClearLineEdit.cpp

@@ -0,0 +1,35 @@
+#include "QClearLineEdit.h"
+#include <QtCore/QDebug>
+
+QClearLineEdit::QClearLineEdit (const QString& contents, QWidget* parent) : QLineEdit(contents, parent) {
+
+    enableReturnPressedOnClear();
+}
+
+QClearLineEdit::QClearLineEdit (QWidget* parent) : QLineEdit(parent) {
+
+    enableReturnPressedOnClear();
+}
+
+QClearLineEdit::~QClearLineEdit () {
+}
+
+void QClearLineEdit::enableReturnPressedOnClear() {
+
+    for (int i=0; i <children().size(); i++) {
+
+        QAction* myClearAction(qobject_cast<QAction*>(children().at(i)));
+
+        if (myClearAction) {
+
+            //qDebug() << myClearAction->objectName();
+
+            // Look for only the QLineEdit clear action.
+            // This name could change or be different.
+            if (myClearAction->objectName() == "_q_qlineeditclearaction") {
+                connect(myClearAction, &QAction::triggered, this, &QLineEdit::returnPressed, Qt::QueuedConnection);
+            }
+        }
+    }
+}
+

src/QClearLineEdit.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QtWidgets/QLineEdit>
+#include <QtWidgets/QAction>
+
+class QClearLineEdit : public QLineEdit {
+
+    public:
+        QClearLineEdit (const QString& contents, QWidget* parent = nullptr);
+        QClearLineEdit (QWidget* parent = nullptr);
+       ~QClearLineEdit ();
+
+        void            enableReturnPressedOnClear          ();
+
+    public slots:
+    protected:
+    private:
+};
+

src/SeerArrayVisualizerWidget.cpp

@@ -49,6 +49,9 @@ SeerArrayVisualizerWidget::SeerArrayVisualizerWidget (QWidget* parent) : QWidget
     handleaArrayDisplayFormatComboBox(0);
     handlebArrayDisplayFormatComboBox(0);
 
+    aVariableNameLineEdit->enableReturnPressedOnClear();
+    bVariableNameLineEdit->enableReturnPressedOnClear();
+
     // A single series chart.
     QChart* chart = new QChart;
     chart->legend()->hide();

src/SeerArrayVisualizerWidget.ui

@@ -112,7 +112,7 @@
       </widget>
      </item>
      <item row="1" column="1">
-      <widget class="QLineEdit" name="bVariableNameLineEdit">
+      <widget class="QClearLineEdit" name="bVariableNameLineEdit">
        <property name="toolTip">
         <string>Variable name or expression.</string>
        </property>
@@ -286,7 +286,7 @@
       </widget>
      </item>
      <item row="0" column="1">
-      <widget class="QLineEdit" name="aVariableNameLineEdit">
+      <widget class="QClearLineEdit" name="aVariableNameLineEdit">
        <property name="toolTip">
         <string>Variable name or expression.</string>
        </property>
@@ -497,7 +497,12 @@
   <customwidget>
    <class>QZoomChartView</class>
    <extends>QGraphicsView</extends>
-   <header>QZoomChartView.h</header>
+   <header location="global">QZoomChartView.h</header>
+  </customwidget>
+  <customwidget>
+   <class>QClearLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header location="global">QClearLineEdit.h</header>
   </customwidget>
  </customwidgets>
  <tabstops>