Qt: Add clear all button to Decode As

Add a clear all button to easily remove all existing entries.

Change-Id: I76e7ee2b7b85a9b4e5f9f5a788a89f38f70ee8ce
Reviewed-on: https://code.wireshark.org/review/30052
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

ui/qt/decode_as_dialog.cpp

@@ -50,6 +50,9 @@ DecodeAsDialog::DecodeAsDialog(QWidget *parent, capture_file *cf, bool create_ne
 
     fillTable();
 
+    connect(model_, SIGNAL(modelReset()), this, SLOT(modelRowsReset()));
+    ui->clearToolButton->setEnabled(model_->rowCount() > 0);
+
     if (create_new)
         on_newToolButton_clicked();
 }
@@ -83,14 +86,23 @@ void DecodeAsDialog::resizeColumns()
     }
 }
 
+void DecodeAsDialog::modelRowsReset()
+{
+    ui->deleteToolButton->setEnabled(false);
+    ui->copyToolButton->setEnabled(false);
+    ui->clearToolButton->setEnabled(false);
+}
+
 void DecodeAsDialog::on_decodeAsTreeView_currentItemChanged(const QModelIndex &current, const QModelIndex&)
 {
     if (current.isValid()) {
         ui->deleteToolButton->setEnabled(true);
         ui->copyToolButton->setEnabled(true);
+        ui->clearToolButton->setEnabled(true);
     } else {
         ui->deleteToolButton->setEnabled(false);
         ui->copyToolButton->setEnabled(false);
+        ui->clearToolButton->setEnabled(false);
     }
 }
 
@@ -138,6 +150,11 @@ void DecodeAsDialog::on_copyToolButton_clicked()
     addRecord(true);
 }
 
+void DecodeAsDialog::on_clearToolButton_clicked()
+{
+    model_->clearAll();
+}
+
 void DecodeAsDialog::applyChanges()
 {
     model_->applyChanges();

ui/qt/decode_as_dialog.h

@@ -47,12 +47,16 @@ private:
     void fillTable();
     void resizeColumns();
 
+public slots:
+    void modelRowsReset();
+
 private slots:
     void on_decodeAsTreeView_currentItemChanged(const QModelIndex &current, const QModelIndex &previous);
 
     void on_newToolButton_clicked();
     void on_deleteToolButton_clicked();
     void on_copyToolButton_clicked();
+    void on_clearToolButton_clicked();
 
     void on_buttonBox_clicked(QAbstractButton *button);
 };

ui/qt/decode_as_dialog.ui

@@ -62,6 +62,20 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QToolButton" name="clearToolButton">
+       <property name="toolTip">
+        <string>Clear all coloring rules.</string>
+       </property>
+       <property name="icon">
+        <iconset resource="../../image/stock_icons.qrc">
+         <normaloff>:/stock/delete_list.png</normaloff>:/stock/delete_list.png</iconset>
+       </property>
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
      <item>
       <spacer name="horizontalSpacer">
        <property name="orientation">

ui/qt/models/decode_as_model.cpp

@@ -391,6 +391,16 @@ bool DecodeAsModel::removeRows(int row, int count, const QModelIndex &/*parent*/
     return true;
 }
 
+void DecodeAsModel::clearAll()
+{
+    if (rowCount() < 1)
+        return;
+
+    beginResetModel();
+    decode_as_items_.clear();
+    endResetModel();
+}
+
 bool DecodeAsModel::copyRow(int dst_row, int src_row)
 {
     if (src_row < 0 || src_row >= rowCount() || dst_row < 0 || dst_row >= rowCount()) {

ui/qt/models/decode_as_model.h

@@ -72,6 +72,7 @@ public:
 
     bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
     bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    void clearAll();
     bool copyRow(int dst_row, int src_row);
 
     static QString entryString(const gchar *table_name, gpointer value);