VariableChooser: add filter

Change-Id: I604b39f96ff303502949d581d094067025093ca0
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/coreplugin/variablechooser.cpp

@@ -80,6 +80,24 @@ private:
     VariableChooserPrivate *m_target;
 };
 
+class VariableSortFilterProxyModel : public QSortFilterProxyModel
+{
+public:
+    explicit VariableSortFilterProxyModel(QObject *parent) : QSortFilterProxyModel(parent) {}
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override
+    {
+        const QModelIndex index = sourceModel()->index(sourceRow, filterKeyColumn(), sourceParent);
+        if (!index.isValid())
+            return false;
+
+        const QRegExp regexp = filterRegExp();
+        if (regexp.isEmpty() || sourceModel()->rowCount(index) > 0)
+            return true;
+
+        const QString displayText = index.data(Qt::DisplayRole).toString();
+        return displayText.contains(regexp);
+    }
+};
 
 class VariableChooserPrivate : public QObject
 {
@@ -101,6 +119,7 @@ public:
     void handleItemActivated(const QModelIndex &index);
     void insertText(const QString &variable);
     void updatePositionAndShow(bool);
+    void updateFilter(const QString &filterText);
 
     QWidget *currentWidget();
 
@@ -116,6 +135,7 @@ public:
     QPointer<QPlainTextEdit> m_plainTextEdit;
     QPointer<IconButton> m_iconButton;
 
+    QLineEdit *m_variableFilter;
     VariableTreeView *m_variableTree;
     QLabel *m_variableDescription;
     QSortFilterProxyModel *m_sortModel;
@@ -251,18 +271,25 @@ VariableChooserPrivate::VariableChooserPrivate(VariableChooser *parent)
       m_textEdit(0),
       m_plainTextEdit(0),
       m_iconButton(0),
+      m_variableFilter(0),
       m_variableTree(0),
       m_variableDescription(0)
 {
     m_defaultDescription = VariableChooser::tr("Select a variable to insert.");
 
+    m_variableFilter = new QLineEdit(q);
     m_variableTree = new VariableTreeView(q, this);
     m_variableDescription = new QLabel(q);
 
-    m_sortModel = new QSortFilterProxyModel(this);
+    m_variableFilter->setPlaceholderText(VariableChooser::tr("Filter"));
+
+    m_sortModel = new VariableSortFilterProxyModel(this);
     m_sortModel->setSourceModel(&m_model);
     m_sortModel->sort(0);
+    m_sortModel->setFilterKeyColumn(0);
+    m_sortModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
     m_variableTree->setModel(m_sortModel);
+
     m_variableDescription->setText(m_defaultDescription);
     m_variableDescription->setMinimumSize(QSize(0, 60));
     m_variableDescription->setAlignment(Qt::AlignLeft|Qt::AlignTop);
@@ -272,9 +299,12 @@ VariableChooserPrivate::VariableChooserPrivate(VariableChooser *parent)
 
     QVBoxLayout *verticalLayout = new QVBoxLayout(q);
     verticalLayout->setContentsMargins(3, 3, 3, 12);
+    verticalLayout->addWidget(m_variableFilter);
     verticalLayout->addWidget(m_variableTree);
     verticalLayout->addWidget(m_variableDescription);
 
+    connect(m_variableFilter, &QLineEdit::textChanged,
+            this, &VariableChooserPrivate::updateFilter);
     connect(m_variableTree, &QTreeView::activated,
             this, &VariableChooserPrivate::handleItemActivated);
     connect(qobject_cast<QApplication *>(qApp), &QApplication::focusChanged,
@@ -368,6 +398,7 @@ VariableChooser::VariableChooser(QWidget *parent) :
     setWindowFlags(Qt::Tool);
     setFocusPolicy(Qt::StrongFocus);
     setFocusProxy(d->m_variableTree);
+    setGeometry(QRect(0, 0, 400, 500));
     addMacroExpanderProvider([]() { return globalMacroExpander(); });
 }
 
@@ -519,6 +550,12 @@ void VariableChooserPrivate::updatePositionAndShow(bool)
     m_variableTree->expandAll();
 }
 
+void VariableChooserPrivate::updateFilter(const QString &filterText)
+{
+    m_sortModel->setFilterWildcard(filterText);
+    m_variableTree->expandAll();
+}
+
 /*!
  * \internal
  */