Properly enable and disable "View/Expand Subtrees". Get rid

of ProtoTree::protoItemUnselected and use an empty string in
protoItemSelected to indicate that nothing is selected.

svn path=/trunk/; revision=44492

ui/qt/main_status_bar.cpp

@@ -243,7 +243,11 @@ void MainStatusBar::popFileStatus() {
 }
 
 void MainStatusBar::pushFieldStatus(QString &message) {
-    m_infoStatus.pushText(message, STATUS_CTX_FIELD);
+    if (message.isNull()) {
+        popFieldStatus();
+    } else {
+        m_infoStatus.pushText(message, STATUS_CTX_FIELD);
+    }
 }
 
 void MainStatusBar::popFieldStatus() {

ui/qt/main_window.cpp

@@ -136,8 +136,9 @@ MainWindow::MainWindow(QWidget *parent) :
 
     connect(protoTree, SIGNAL(protoItemSelected(QString&)),
             ui->statusBar, SLOT(pushFieldStatus(QString&)));
-    connect(protoTree, SIGNAL(protoItemUnselected()),
-            ui->statusBar, SLOT(popFieldStatus()));
+
+    connect(protoTree, SIGNAL(protoItemSelected(bool)),
+            ui->actionViewExpandSubtrees, SLOT(setEnabled(bool)));
 
     ui->mainStack->setCurrentWidget(mainWelcome);
 }

ui/qt/main_window.ui

@@ -406,6 +406,9 @@
    </property>
   </action>
   <action name="actionViewExpandSubtrees">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
    <property name="text">
     <string>E&amp;xpand Subtrees</string>
    </property>

ui/qt/proto_tree.cpp

@@ -190,8 +190,10 @@ void ProtoTree::updateSelectionStatus(QTreeWidgetItem* item) {
                 itemInfo.append(QString(tr(", %1 bytes")).arg(finfo_length));
             }
 
-            emit protoItemUnselected();
+            emit protoItemSelected(QString());
+            emit protoItemSelected(false);
             emit protoItemSelected(itemInfo);
+            emit protoItemSelected(true);
         } // else the GTK+ version pushes an empty string as described below.
         /*
          * Don't show anything if the field name is zero-length;
@@ -214,7 +216,8 @@ void ProtoTree::updateSelectionStatus(QTreeWidgetItem* item) {
          */
 
     } else {
-        emit protoItemUnselected();
+        emit protoItemSelected(QString());
+        emit protoItemSelected(false);
     }
 }
 
@@ -224,12 +227,28 @@ void ProtoTree::expandSubtrees()
 {
     QTreeWidgetItem *topSel;
 
-    foreach(topSel, selectedItems()) {
-        QTreeWidgetItemIterator iter(topSel);
-        while (*iter) {
-            (*iter)->setExpanded(true);
-            iter++;
+    if (selectedItems().length() < 1) {
+        return;
+    }
+
+    topSel = selectedItems()[0];
+
+    if (!topSel) {
+        return;
+    }
+
+    while (topSel->parent()) {
+        topSel = topSel->parent();
+    }
+
+    QTreeWidgetItemIterator iter(topSel);
+    while (*iter) {
+        if ((*iter) != topSel && (*iter)->parent() == NULL) {
+            // We found the next top-level item
+            break;
         }
+        (*iter)->setExpanded(true);
+        iter++;
     }
 }
 

ui/qt/proto_tree.h

@@ -43,7 +43,7 @@ private:
 
 signals:
     void protoItemSelected(QString &);
-    void protoItemUnselected();
+    void protoItemSelected(bool);
 
 public slots:
     void updateSelectionStatus(QTreeWidgetItem*);