--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/filterwidget.cpp	Wed Mar 25 14:23:46 2015 +0100
@@ -0,0 +1,64 @@
+#include "filterwidget.h"
+
+#include <QComboBox>
+#include <QHBoxLayout>
+#include <QGroupBox>
+#include <QSortFilterProxyModel>
+#include <QAbstractItemModel>
+#include <QLineEdit>
+#include <QDebug>
+
+FilterWidget::FilterWidget(QSortFilterProxyModel *model, QWidget *parent, Qt::WindowFlags f) :
+    QWidget(parent, f),
+    mModel(model) {
+    Q_ASSERT(model);
+    setupGUI();
+
+    connect(mModel, &QSortFilterProxyModel::sourceModelChanged,
+            this, &FilterWidget::headersChanged);
+    void (QComboBox:: *idxChanged)(int) = &QComboBox::currentIndexChanged;
+    connect(mCombo, idxChanged, this,
+            &FilterWidget::filterChanged);
+ //connect(mCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(filterChanged()));
+    connect(mEditLine, &QLineEdit::textChanged, this,
+            &FilterWidget::filterChanged);
+}
+
+void FilterWidget::headersChanged() {
+    QAbstractItemModel *newSource = mModel->sourceModel();
+    Q_ASSERT(newSource);
+    mCombo->clear();
+    for (int i=0; i < newSource->columnCount(); i++) {
+        mCombo->addItem(newSource->headerData(i, Qt::Horizontal).toString());
+    }
+}
+
+void FilterWidget::filterChanged() {
+    QString filterText = mEditLine->text();
+    if (filterText.size() < 1) {
+        return;
+    }
+    mModel->setFilterKeyColumn(mCombo->currentIndex());
+    mModel->setFilterWildcard(filterText);
+}
+
+void FilterWidget::setupGUI() {
+    QHBoxLayout *root = new QHBoxLayout;
+
+    QGroupBox *baseGroup = new QGroupBox(tr("Filter"));
+    root->addWidget(baseGroup);
+
+    QHBoxLayout *baseLayout = new QHBoxLayout;
+    baseGroup->setLayout(baseLayout);
+
+    mCombo = new QComboBox;
+    baseLayout->addWidget(mCombo);
+
+    mEditLine = new QLineEdit;
+    mEditLine->setPlaceholderText(tr("Filter expression"));
+    mEditLine->setClearButtonEnabled(true);
+    baseLayout->addWidget(mEditLine);
+
+    setLayout(root);
+}
+