Pass return/enter and arrow keys from search box to tree view

zeal/mainwindow.cpp

@@ -29,6 +29,7 @@ MainWindow::MainWindow(QWidget *parent) :
         }
     }
     ui->setupUi(this);
+    ui->lineEdit->setTreeView(ui->treeView);
     ui->treeView->setModel(&zealList);
     ui->treeView->setColumnHidden(1, true);
     connect(ui->treeView, &QTreeView::activated, [&](const QModelIndex& index) {
@@ -38,6 +39,7 @@ MainWindow::MainWindow(QWidget *parent) :
         ui->treeView->setModel(&zealSearch);
         ui->treeView->reset();
         ui->treeView->setColumnHidden(1, true);
+        ui->treeView->setCurrentIndex(zealSearch.index(0, 0, QModelIndex()));
     });
     connect(ui->lineEdit, &QLineEdit::textChanged, [&](const QString& text) {
         if(!text.isEmpty()) {

zeal/mainwindow.ui

@@ -23,7 +23,7 @@
       <widget class="QWidget" name="">
        <layout class="QVBoxLayout" name="verticalLayout">
         <item>
-         <widget class="QLineEdit" name="lineEdit"/>
+         <widget class="ZealSearchEdit" name="lineEdit"/>
         </item>
         <item>
          <widget class="QTreeView" name="treeView">
@@ -78,6 +78,11 @@
    <extends>QWidget</extends>
    <header>QtWebKit/QWebView</header>
   </customwidget>
+  <customwidget>
+   <class>ZealSearchEdit</class>
+   <extends>QLineEdit</extends>
+   <header>zealsearchedit.h</header>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>

zeal/zeal.pro

@@ -16,13 +16,15 @@ SOURCES += main.cpp\
     zeallistmodel.cpp \
     zealsearchmodel.cpp \
     zealdocsetsregistry.cpp \
-    zealsearchresult.cpp
+    zealsearchresult.cpp \
+    zealsearchedit.cpp
 
 HEADERS  += mainwindow.h \
     zeallistmodel.h \
     zealsearchmodel.h \
     zealdocsetsregistry.h \
-    zealsearchresult.h
+    zealsearchresult.h \
+    zealsearchedit.h
 
 FORMS    += mainwindow.ui
 

zeal/zealsearchedit.cpp

@@ -0,0 +1,28 @@
+#include "zealsearchedit.h"
+#include <QCoreApplication>
+#include <QKeyEvent>
+#include <QDebug>
+
+ZealSearchEdit::ZealSearchEdit(QWidget *parent) :
+    QLineEdit(parent)
+{
+}
+
+void ZealSearchEdit::setTreeView(QTreeView *view)
+{
+    treeView = view;
+    this->installEventFilter(this);
+}
+
+bool ZealSearchEdit::eventFilter(QObject *obj, QEvent *ev)
+{
+    if(obj == this && ev->type() == QEvent::KeyPress) {
+        QKeyEvent *keyEvent = static_cast<QKeyEvent*>(ev);
+        if(keyEvent->key() == Qt::Key_Down || keyEvent->key() == Qt::Key_Up ||
+                keyEvent->key() == Qt::Key_Enter || keyEvent->key() == Qt::Key_Return) {
+            QCoreApplication::instance()->sendEvent(treeView, keyEvent);
+            return true;
+        }
+    }
+    return QLineEdit::eventFilter(obj, ev);
+}

zeal/zealsearchedit.h

@@ -0,0 +1,26 @@
+#ifndef ZEALSEARCHEDIT_H
+#define ZEALSEARCHEDIT_H
+
+#include <QEvent>
+#include <QTreeView>
+#include <QLineEdit>
+
+class ZealSearchEdit : public QLineEdit
+{
+    Q_OBJECT
+public:
+    explicit ZealSearchEdit(QWidget *parent = 0);
+    void setTreeView(QTreeView *view);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *ev);
+
+signals:
+    
+public slots:
+
+private:
+    QTreeView *treeView;
+};
+
+#endif // ZEALSEARCHEDIT_H