Added a custom widget for tagging dives

A custom tag widget has been added to MainTab.
Tags are seperated by a comma ",". The implementation
supports escaping a comma by using "\,".
While typing, the widget supports the user by suggesting
tags using a QCompleter.

Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com>

qt-ui/completionmodels.cpp

@@ -12,6 +12,7 @@ CREATE_SINGLETON(BuddyCompletionModel);
 CREATE_SINGLETON(DiveMasterCompletionModel);
 CREATE_SINGLETON(LocationCompletionModel);
 CREATE_SINGLETON(SuitCompletionModel);
+CREATE_SINGLETON(TagCompletionModel);
 
 #undef CREATE_SINGLETON
 
@@ -35,3 +36,15 @@ CREATE_UPDATE_METHOD(DiveMasterCompletionModel, divemaster);
 CREATE_UPDATE_METHOD(LocationCompletionModel, location);
 CREATE_UPDATE_METHOD(SuitCompletionModel, suit);
 
+void TagCompletionModel::updateModel()
+{
+	if(g_tag_list == NULL)
+		return;
+	QStringList list;
+	struct tag_entry *current_tag_entry = g_tag_list->next;
+	while (current_tag_entry != NULL) {
+		list.append(QString(current_tag_entry->tag->name));
+		current_tag_entry = current_tag_entry->next;
+	}
+	setStringList(list);
+}

qt-ui/completionmodels.h

@@ -31,4 +31,11 @@ public:
 	void updateModel();
 };
 
+class TagCompletionModel : public QStringListModel {
+	Q_OBJECT
+public:
+	static TagCompletionModel* instance();
+	void updateModel();
+};
+
 #endif

qt-ui/groupedlineedit.cpp

@@ -0,0 +1,204 @@
+/*
+ * This file is part of the Nepomuk widgets collection
+ * Copyright (c) 2013 Denis Steckelmacher <steckdenis@yahoo.fr>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2.1 as published by the Free Software Foundation,
+ * or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+*/
+
+#include "groupedlineedit.h"
+
+#include <QtGui/QStyleOptionFrameV3>
+#include <QtGui/QFontMetrics>
+#include <QtGui/QApplication>
+#include <QtGui/QScrollBar>
+#include <QtGui/QTextDocument>
+#include <QtGui/QTextBlock>
+#include <QtGui/QTextLayout>
+#include <QtGui/QTextLine>
+#include <QtGui/QPainter>
+#include <QtGui/QPainterPath>
+#include <QtGui/QBrush>
+#include <QtGui/QColor>
+#include <QtGui/QPalette>
+
+struct GroupedLineEdit::Private
+{
+    struct Block {
+	    int start;
+	    int end;
+	    QString text;
+    };
+    QVector<Block> blocks;
+    QVector<QColor> colors;
+};
+
+GroupedLineEdit::GroupedLineEdit(QWidget* parent)
+: QPlainTextEdit(parent),
+  d(new Private)
+{
+    setWordWrapMode(QTextOption::NoWrap);
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    document()->setMaximumBlockCount(1);
+}
+
+
+GroupedLineEdit::~GroupedLineEdit()
+{
+    delete d;
+}
+
+QString GroupedLineEdit::text() const
+{
+    // Remove the block crosses from the text
+    return toPlainText();
+}
+
+int GroupedLineEdit::cursorPosition() const
+{
+    return textCursor().positionInBlock();
+}
+
+void GroupedLineEdit::addBlock(int start, int end)
+{
+    Private::Block block;
+
+    block.start = start;
+    block.end = end;
+    block.text = text().mid(start, end-start+1).trimmed();
+    d->blocks.append(block);
+    viewport()->update();
+}
+
+void GroupedLineEdit::addColor(QColor color)
+{
+    d->colors.append(color);
+}
+
+void GroupedLineEdit::removeAllColors()
+{
+	d->colors.clear();
+}
+
+QStringList GroupedLineEdit::getBlockStringList()
+{
+	QStringList retList;
+	Private::Block block;
+	foreach(block, d->blocks)
+		retList.append(block.text);
+	return retList;
+}
+
+void GroupedLineEdit::setCursorPosition(int position)
+{
+    QTextCursor c = textCursor();
+
+    c.setPosition(position, QTextCursor::MoveAnchor);
+
+    setTextCursor(c);
+}
+
+void GroupedLineEdit::setText(const QString &text)
+{
+    setPlainText(text);
+}
+
+void GroupedLineEdit::clear()
+{
+    QPlainTextEdit::clear();
+    removeAllBlocks();
+}
+
+void GroupedLineEdit::selectAll()
+{
+    QTextCursor c = textCursor();
+
+    c.select(QTextCursor::LineUnderCursor);
+
+    setTextCursor(c);
+}
+
+void GroupedLineEdit::removeAllBlocks()
+{
+    d->blocks.clear();
+    viewport()->update();
+}
+
+QSize GroupedLineEdit::sizeHint() const
+{
+    QSize rs(
+        40,
+        document()->findBlock(0).layout()->lineAt(0).height() +
+            document()->documentMargin() * 2 +
+            frameWidth() * 2
+    );
+
+    return rs;
+}
+
+QSize GroupedLineEdit::minimumSizeHint() const
+{
+    return sizeHint();
+}
+
+void GroupedLineEdit::keyPressEvent(QKeyEvent *e)
+{
+    switch (e->key()) {
+    case Qt::Key_Return:
+    case Qt::Key_Enter:
+        emit editingFinished();
+        return;
+    }
+
+    QPlainTextEdit::keyPressEvent(e);
+}
+
+void GroupedLineEdit::paintEvent(QPaintEvent *e)
+{
+
+    QTextLine line = document()->findBlock(0).layout()->lineAt(0);
+    QPainter painter(viewport());
+
+    painter.setRenderHint(QPainter::Antialiasing, true);
+    painter.setRenderHint(QPainter::HighQualityAntialiasing, true);
+
+    painter.fillRect(0, 0, viewport()->width(), viewport()->height(), palette().base());
+
+    QVectorIterator<QColor> i(d->colors);
+    i.toFront();
+    foreach (const Private::Block &block, d->blocks) {
+        qreal start_x = line.cursorToX(block.start, QTextLine::Trailing);
+        qreal end_x = line.cursorToX(block.end + 1, QTextLine::Leading);
+        QPainterPath path;
+        QRectF rectangle(
+            start_x - 1.0 - double(horizontalScrollBar()->value()),
+            1.0,
+            end_x - start_x + 2.0,
+            double(viewport()->height() - 2)
+        );
+        if (! i.hasNext())
+            i.toFront();
+        path.addRoundedRect(rectangle, 5.0, 5.0);
+        painter.setPen(i.peekNext());
+        painter.setBrush(i.next().lighter(180));
+        painter.drawPath(path);
+    }
+
+    QPlainTextEdit::paintEvent(e);
+}

qt-ui/groupedlineedit.h

@@ -0,0 +1,66 @@
+/* Original License:
+ *
+ * This file is part of the Nepomuk widgets collection
+ *  Copyright (c) 2013 Denis Steckelmacher <steckdenis@yahoo.fr>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2.1 as published by the Free Software Foundation,
+ * or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ *
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GROUPEDLINEEDIT_H__
+#define __GROUPEDLINEEDIT_H__
+
+#include <QtGui/QPlainTextEdit>
+#include <QStringList>
+
+class GroupedLineEdit : public QPlainTextEdit
+{
+	Q_OBJECT
+
+public:
+	explicit GroupedLineEdit(QWidget *parent = 0);
+	virtual ~GroupedLineEdit();
+
+	QString text() const;
+
+	int cursorPosition() const;
+	void setCursorPosition(int position);
+	void setText(const QString &text);
+	void clear();
+	void selectAll();
+
+	void removeAllBlocks();
+	void addBlock(int start, int end);
+	QStringList getBlockStringList();
+
+	void addColor(QColor color);
+	void removeAllColors();
+
+	virtual QSize sizeHint() const;
+	virtual QSize minimumSizeHint() const;
+
+signals:
+	void editingFinished();
+
+protected:
+	virtual void paintEvent(QPaintEvent *e);
+	virtual void keyPressEvent(QKeyEvent *e);
+
+private:
+	struct Private;
+	Private *d;
+};
+#endif

qt-ui/maintab.cpp

@@ -58,6 +58,7 @@ MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
 	ui.airtemp->installEventFilter(this);
 	ui.watertemp->installEventFilter(this);
 	ui.dateTimeEdit->installEventFilter(this);
+	ui.tagWidget->installEventFilter(this);
 
 	QList<QObject *> statisticsTabWidgets = ui.statisticsTab->children();
 	Q_FOREACH(QObject* obj, statisticsTabWidgets) {
@@ -87,10 +88,12 @@ MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
 	completers.divemaster = new QCompleter(DiveMasterCompletionModel::instance(), ui.divemaster);
 	completers.location = new QCompleter(LocationCompletionModel::instance(), ui.location);
 	completers.suit = new QCompleter(SuitCompletionModel::instance(), ui.suit);
+	completers.tags = new QCompleter(TagCompletionModel::instance(), ui.tagWidget);
 	ui.buddy->setCompleter(completers.buddy);
 	ui.divemaster->setCompleter(completers.divemaster);
 	ui.location->setCompleter(completers.location);
 	ui.suit->setCompleter(completers.suit);
+	ui.tagWidget->setCompleter(completers.tags);
 
 	setMinimumHeight(0);
 	setMinimumWidth(0);
@@ -161,6 +164,9 @@ void MainTab::enableEdition(EditMode newEditMode)
 			notesBackup[mydive].airtemp = get_temperature_string(mydive->airtemp, true);
 			notesBackup[mydive].watertemp = get_temperature_string(mydive->watertemp, true);
 			notesBackup[mydive].datetime = QDateTime::fromTime_t(mydive->when - gettimezoneoffset()).toString(QString("M/d/yy h:mm"));
+			char buf[1024];
+			taglist_get_tagstring(mydive->tag_list, buf, 1024);
+			notesBackup[mydive].tags = QString(buf);
 
 			// maybe this is a place for memset?
 			for (int i = 0; i < MAX_CYLINDERS; i++) {
@@ -182,7 +188,9 @@ bool MainTab::eventFilter(QObject* object, QEvent* event)
 		enableEdition();
 	}
 
-	if (isEnabled() && event->type() == QEvent::FocusIn && (object == ui.rating || object == ui.visibility)) {
+	if (isEnabled() && event->type() == QEvent::FocusIn && (object == ui.rating ||
+								object == ui.visibility	||
+								object == ui.tagWidget)) {
 		tabBar()->setTabIcon(currentIndex(), QIcon(":warning"));
 		enableEdition();
 	}
@@ -215,6 +223,7 @@ void MainTab::clearInfo()
 	ui.airTemperatureText->clear();
 	ui.airPressureText->clear();
 	ui.salinityText->clear();
+	ui.tagWidget->clear();
 }
 
 void MainTab::clearStats()
@@ -356,6 +365,11 @@ void MainTab::updateDiveInfo(int dive)
 		ui.timeLimits->setMaximum(get_time_string(stats_selection.longest_time.seconds, 0));
 		ui.timeLimits->setMinimum(get_time_string(stats_selection.shortest_time.seconds, 0));
 
+
+		char buf[1024];
+		taglist_get_tagstring(d->tag_list, buf, 1024);
+		ui.tagWidget->setText(QString(buf));
+
 		multiEditEquipmentPlaceholder = *d;
 		cylindersModel->setDive(&multiEditEquipmentPlaceholder);
 		weightModel->setDive(&multiEditEquipmentPlaceholder);
@@ -393,6 +407,7 @@ void MainTab::reload()
 	BuddyCompletionModel::instance()->updateModel();
 	LocationCompletionModel::instance()->updateModel();
 	DiveMasterCompletionModel::instance()->updateModel();
+	TagCompletionModel::instance()->updateModel();
 }
 
 void MainTab::acceptChanges()
@@ -423,7 +438,8 @@ void MainTab::acceptChanges()
 			notesBackup[curr].airtemp != ui.airtemp->text() ||
 			notesBackup[curr].watertemp != ui.watertemp->text() ||
 			notesBackup[curr].datetime != ui.dateTimeEdit->dateTime().toString(QString("M/d/yy h:mm")) ||
-			notesBackup[curr].visibility != ui.rating->currentStars()) {
+			notesBackup[curr].visibility != ui.rating->currentStars() ||
+			notesBackup[curr].tags != ui.tagWidget->text()) {
 			mark_divelist_changed(TRUE);
 		}
 		if (notesBackup[curr].location != ui.location->text() ||
@@ -431,6 +447,9 @@ void MainTab::acceptChanges()
 			mainWindow()->globe()->reload();
 		}
 
+		if (notesBackup[curr].tags != ui.tagWidget->text())
+			saveTags();
+
 		if (cylindersModel->changed) {
 			mark_divelist_changed(TRUE);
 			Q_FOREACH (dive *d, notesBackup.keys()) {
@@ -480,6 +499,7 @@ void MainTab::resetPallete()
 	ui.airtemp->setPalette(p);
 	ui.watertemp->setPalette(p);
 	ui.dateTimeEdit->setPalette(p);
+	ui.tagWidget->setPalette(p);
 }
 
 #define EDIT_TEXT2(what, text) \
@@ -522,6 +542,7 @@ void MainTab::rejectChanges()
 		ui.airtemp->setText(notesBackup[curr].airtemp);
 		ui.watertemp->setText(notesBackup[curr].watertemp);
 		ui.dateTimeEdit->setDateTime(QDateTime::fromString(notesBackup[curr].datetime, QString("M/d/y h:mm")));
+		ui.tagWidget->setText(notesBackup[curr].tags);
 
 		struct dive *mydive;
 		for (int i = 0; i < dive_table.nr; i++) {
@@ -628,6 +649,21 @@ void MainTab::on_dateTimeEdit_dateTimeChanged(const QDateTime& datetime)
 	markChangedWidget(ui.dateTimeEdit);
 }
 
+void MainTab::saveTags()
+{
+	EDIT_SELECTED_DIVES(
+		QString tag;
+		taglist_clear(mydive->tag_list);
+		foreach (tag, ui.tagWidget->getBlockStringList())
+			taglist_add_tag(mydive->tag_list, tag.toAscii().data());
+	);
+}
+
+void MainTab::on_tagWidget_textChanged()
+{
+	markChangedWidget(ui.tagWidget);
+}
+
 void MainTab::on_location_textChanged(const QString& text)
 {
 	if (editMode == NONE)

qt-ui/maintab.h

@@ -31,6 +31,7 @@ struct NotesBackup{
 	int rating;
 	int visibility;
 	QString divemaster;
+	QString tags;
 	cylinder_t cylinders[MAX_CYLINDERS];
 	weightsystem_t weightsystem[MAX_WEIGHTSYSTEMS ];
 };
@@ -40,6 +41,7 @@ struct Completers{
 	QCompleter *divemaster;
 	QCompleter *buddy;
 	QCompleter *suit;
+	QCompleter *tags;
 };
 
 class MainTab : public QTabWidget
@@ -73,6 +75,7 @@ public slots:
 	void on_dateTimeEdit_dateTimeChanged(const QDateTime& datetime);
 	void on_rating_valueChanged(int value);
 	void on_visibility_valueChanged(int value);
+	void on_tagWidget_textChanged();
 	void editCylinderWidget(const QModelIndex& index);
 	void editWeightWidget(const QModelIndex& index);
 	void addDiveStarted();
@@ -94,6 +97,7 @@ private:
 
 	Completers completers;
 	void resetPallete();
+	void saveTags();
 	QString printGPSCoords(int lat, int lon);
 };
 

qt-ui/maintab.ui

@@ -37,8 +37,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>513</width>
+         <width>501</width>
-         <height>468</height>
+         <height>535</height>
         </rect>
        </property>
        <layout class="QGridLayout" name="gridLayout_2">
@@ -102,6 +102,13 @@
           </item>
          </layout>
         </item>
+        <item row="4" column="0" colspan="2">
+         <widget class="QLineEdit" name="location">
+          <property name="readOnly">
+           <bool>false</bool>
+          </property>
+         </widget>
+        </item>
         <item row="3" column="0">
          <widget class="QLabel" name="LocationLabel">
           <property name="text">
@@ -109,8 +116,22 @@
           </property>
          </widget>
         </item>
-        <item row="4" column="0" colspan="2">
+        <item row="11" column="0">
-         <widget class="QLineEdit" name="location">
+         <widget class="QLabel" name="TagLabel">
+          <property name="text">
+           <string>Tags</string>
+          </property>
+         </widget>
+        </item>
+        <item row="6" column="0" colspan="2">
+         <widget class="QLineEdit" name="coordinates">
+          <property name="readOnly">
+           <bool>false</bool>
+          </property>
+         </widget>
+        </item>
+        <item row="8" column="0">
+         <widget class="QLineEdit" name="divemaster">
           <property name="readOnly">
            <bool>false</bool>
           </property>
@@ -123,8 +144,15 @@
           </property>
          </widget>
         </item>
-        <item row="6" column="0" colspan="2">
+        <item row="7" column="1">
-         <widget class="QLineEdit" name="coordinates">
+         <widget class="QLabel" name="BuddyLabel">
+          <property name="text">
+           <string>Buddy</string>
+          </property>
+         </widget>
+        </item>
+        <item row="8" column="1">
+         <widget class="QLineEdit" name="buddy">
           <property name="readOnly">
            <bool>false</bool>
           </property>
@@ -137,22 +165,8 @@
           </property>
          </widget>
         </item>
-        <item row="7" column="1">
+        <item row="10" column="1">
-         <widget class="QLabel" name="BuddyLabel">
+         <widget class="QLineEdit" name="suit">
-          <property name="text">
-           <string>Buddy</string>
-          </property>
-         </widget>
-        </item>
-        <item row="8" column="0">
-         <widget class="QLineEdit" name="divemaster">
-          <property name="readOnly">
-           <bool>false</bool>
-          </property>
-         </widget>
-        </item>
-        <item row="8" column="1">
-         <widget class="QLineEdit" name="buddy">
           <property name="readOnly">
            <bool>false</bool>
           </property>
@@ -176,6 +190,13 @@
           </item>
          </layout>
         </item>
+        <item row="14" column="0" colspan="2">
+         <widget class="QTextEdit" name="notes">
+          <property name="readOnly">
+           <bool>false</bool>
+          </property>
+         </widget>
+        </item>
         <item row="9" column="1">
          <widget class="QLabel" name="SuitLabel">
           <property name="text">
@@ -193,34 +214,45 @@
           </item>
          </layout>
         </item>
-        <item row="10" column="1">
+        <item row="13" column="0">
-         <widget class="QLineEdit" name="suit">
-          <property name="readOnly">
-           <bool>false</bool>
-          </property>
-         </widget>
-        </item>
-        <item row="11" column="0">
          <widget class="QLabel" name="NotesLabel">
           <property name="text">
            <string>Notes</string>
           </property>
          </widget>
         </item>
-        <item row="12" column="0" colspan="2">
+        <item row="15" column="0" colspan="2">
-         <widget class="QTextEdit" name="notes">
-          <property name="readOnly">
-           <bool>false</bool>
-          </property>
-         </widget>
-        </item>
-        <item row="13" column="0" colspan="2">
          <widget class="QDialogButtonBox" name="notesButtonBox">
           <property name="standardButtons">
            <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
           </property>
          </widget>
         </item>
+        <item row="12" column="0" colspan="2">
+         <widget class="TagWidget" name="tagWidget">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="minimumSize">
+           <size>
+            <width>0</width>
+            <height>0</height>
+           </size>
+          </property>
+          <property name="verticalScrollBarPolicy">
+           <enum>Qt::ScrollBarAlwaysOff</enum>
+          </property>
+          <property name="horizontalScrollBarPolicy">
+           <enum>Qt::ScrollBarAlwaysOff</enum>
+          </property>
+          <property name="lineWrapMode">
+           <enum>QPlainTextEdit::NoWrap</enum>
+          </property>
+         </widget>
+        </item>
        </layout>
       </widget>
      </widget>
@@ -248,8 +280,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>513</width>
+         <width>515</width>
-         <height>468</height>
+         <height>473</height>
         </rect>
        </property>
        <layout class="QGridLayout" name="gridLayout_5">
@@ -335,8 +367,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>513</width>
+         <width>515</width>
-         <height>468</height>
+         <height>473</height>
         </rect>
        </property>
        <layout class="QGridLayout" name="gridLayout_6">
@@ -584,7 +616,7 @@
          </widget>
         </item>
         <item row="4" column="0">
-         <widget class="QGroupBox">
+         <widget class="QGroupBox" name="groupBox">
           <property name="title">
            <string>Salinity</string>
           </property>
@@ -642,8 +674,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>513</width>
+         <width>515</width>
-         <height>468</height>
+         <height>473</height>
         </rect>
        </property>
        <layout class="QGridLayout" name="gridLayout_7">
@@ -802,6 +834,11 @@
    <header>tableview.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>TagWidget</class>
+   <extends>QPlainTextEdit</extends>
+   <header>qt-ui/tagwidget.h</header>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>

qt-ui/tagwidget.cpp

@@ -0,0 +1,135 @@
+#include "tagwidget.h"
+#include <QPair>
+#include <QDebug>
+
+TagWidget::TagWidget(QWidget *parent) : GroupedLineEdit(parent), m_completer(NULL)
+{
+	connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(reparse()));
+
+	addColor(QColor(0x00, 0xAE, 0xFF));
+	addColor(QColor(0x00, 0x78, 0xB0));
+}
+
+void TagWidget::setCompleter(QCompleter *completer)
+{
+	m_completer = completer;
+	m_completer->setWidget(this);
+	connect(m_completer, SIGNAL(activated(QString)), this, SLOT(completionSelected(QString)));
+}
+
+QPair<int,int> TagWidget::getCursorTagPosition() {
+	int i = 0, start = 0, end = 0;
+	/* Parse string near cursor */
+	i = cursorPosition();
+	while (--i > 0) {
+		if (text().at(i) == ',') {
+			if (i > 0 && text().at(i-1) != '\\') {
+				i++;
+				break;
+			}
+		}
+	}
+	start = i;
+	while (++i < text().length()) {
+		if (text().at(i) == ',') {
+			if (i > 0 && text().at(i-1) != '\\')
+				break;
+		}
+	}
+	end = i;
+	if (start < 0 || end < 0) {
+		start = 0;
+		end = 0;
+	}
+	return QPair<int,int>(start,end);
+}
+
+enum ParseState {FINDSTART, FINDEND};
+
+void TagWidget::highlight() {
+	int i = 0, start = 0, end = 0;
+	ParseState state = FINDEND;
+	removeAllBlocks();
+
+	while(i < text().length()) {
+		if (text().at(i) == ',') {
+			if (state == FINDSTART) {
+				/* Detect empty tags */
+			} else if (state == FINDEND) {
+				/* Found end of tag */
+				if (i > 1) {
+					if(text().at(i-1) != '\\') {
+						addBlock(start, end);
+						state = FINDSTART;
+					}
+				} else {
+					state = FINDSTART;
+				}
+			}
+		} else if (text().at(i) == ' ') {
+			/* Handled */
+		} else {
+			/* Found start of tag */
+			if (state == FINDSTART) {
+				state = FINDEND;
+				start = i;
+			} else if (state == FINDEND) {
+				end = i;
+			}
+		}
+		i++;
+	}
+	if (state == FINDEND) {
+		if (end < start)
+			end = text().length()-1;
+		if (text().length() > 0)
+			addBlock(start, end);
+	}
+}
+
+void TagWidget::reparse()
+{
+	highlight();
+	QPair<int,int> pos = getCursorTagPosition();
+	QString currentText;
+	if (pos.first >= 0 && pos.second > 0)
+		currentText = text().mid(pos.first, pos.second-pos.first).trimmed();
+	else
+		currentText = "";
+	if (m_completer) {
+		m_completer->setCompletionPrefix(currentText);
+		m_completer->complete();
+	}
+}
+
+void TagWidget::completionSelected(QString completion) {
+	QPair <int,int> pos;
+	pos = getCursorTagPosition();
+	if (pos.first >= 0 && pos.second > 0) {
+		setText(text().remove(pos.first, pos.second-pos.first).insert(pos.first, completion));
+		setCursorPosition(pos.first+completion.length());
+	}
+	else {
+		setText(completion.append(", "));
+		setCursorPosition(text().length());
+	}
+}
+
+void TagWidget::setCursorPosition(int position) {
+	blockSignals(true);
+	GroupedLineEdit::setCursorPosition(position);
+	blockSignals(false);
+}
+
+void TagWidget::setText(QString text) {
+	blockSignals(true);
+	GroupedLineEdit::setText(text);
+	blockSignals(false);
+	highlight();
+}
+
+void TagWidget::clear() {
+	blockSignals(true);
+	GroupedLineEdit::clear();
+	blockSignals(false);
+}

qt-ui/tagwidget.h

@@ -0,0 +1,26 @@
+#ifndef __TAGWIDGET_H
+#define __TAGWIDGET_H
+
+#include "groupedlineedit.h"
+#include <QCompleter>
+#include <QPair>
+
+class TagWidget : public GroupedLineEdit
+{
+    Q_OBJECT
+public:
+    explicit TagWidget(QWidget *parent = 0);
+	void setCompleter(QCompleter *completer);
+	QPair<int, int> getCursorTagPosition();
+	void highlight();
+	void setText(QString text);
+	void clear();
+	void setCursorPosition(int position);
+public slots:
+        void reparse();
+	void completionSelected(QString);
+private:
+        QCompleter *m_completer;
+};
+
+#endif /* __TAGWIDGET_H */

subsurface.pro

@@ -56,7 +56,9 @@ HEADERS = \
 	subsurfacestartup.h \
 	uemis.h \
 	webservice.h \
-	qt-ui/csvimportdialog.h
+	qt-ui/csvimportdialog.h \
+	qt-ui/tagwidget.h \
+	qt-ui/groupedlineedit.h
 
 SOURCES =  \
 	deco.c \
@@ -103,7 +105,9 @@ SOURCES =  \
 	time.c \
 	uemis.c \
 	uemis-downloader.c \
-	qt-ui/csvimportdialog.cpp
+	qt-ui/csvimportdialog.cpp \
+	qt-ui/tagwidget.cpp \
+	qt-ui/groupedlineedit.cpp
 
 linux*: SOURCES += linux.c
 mac: SOURCES += macos.c