Implement filter

Add a proxy model class with filter logic, and use it as the model for
events ListView.

Sidebar.qml

@@ -20,6 +20,11 @@ Page {
         onRowsRemoved: modified = true
     }
 
+    EventFilter {
+        id: eventFilter
+        sourceModel: eventList
+    }
+
     FileDialog {
         id: videoDialog
         title: qsTr('Open video')
@@ -122,7 +127,24 @@ Page {
         // Events list.
         ColumnLayout {
             spacing: 0
-            Label { text: qsTr('Events') }
+
+            RowLayout {
+                Label {
+                    text: qsTr('Events')
+                    Layout.fillWidth: true
+                }
+                Label { text: qsTr('🔍') }
+                TapHandler { onTapped: filter.visible = !filter.visible }
+            }
+
+            TextField {
+                id: filter
+                Layout.fillWidth: true
+                placeholderText: qsTr('Filter…')
+                visible: false
+                onTextChanged: eventFilter.setFilter(text)
+            }
+
             Frame {
                 padding: 1
                 Layout.fillWidth: true
@@ -133,7 +155,7 @@ Page {
 
                     anchors.fill: parent
                     focus: true
-                    model: eventList
+                    model: eventFilter
                     tags: eventList.tags
 
                     onEditingChanged: video.pause(editing)
@@ -168,7 +190,7 @@ Page {
                             break
                         case Qt.Key_Delete:
                             editing = false
-                            eventList.removeRows(currentIndex)
+                            eventFilter.remove(currentIndex)
                             break
                         case Qt.Key_Tab:
                         case Qt.Key_Backtab:
@@ -212,9 +234,15 @@ Page {
                     model: eventList.tagsOrder.map(tag => eventList.tags[tag])
                     enabled: video.loaded && !events.editing
                     onClicked: {
-                        events.currentIndex = eventList.insert(video.time)
+                        const index = eventList.insert(tag, video.time)
+                        // Reset filter if new event doesn’t match.
+                        var row = eventFilter.mapFromSource(eventList.index(index, 0)).row
+                        if (eventFilter.mapFromSource(eventList.index(index, 0)).row === -1) {
+                            filter.text = ''
+                            row = index
+                        }
+                        events.currentIndex = row
                         const event = events.currentItem
-                        event.model.tag = tag
                         if (event.fields.length > 0)
                             events.editing = true
                     }

event_filter.cpp

@@ -0,0 +1,79 @@
+#include "event_filter.h"
+
+#include <QAbstractItemModel>
+#include <QMetaType>
+#include <QRegularExpression>
+
+void EventFilter::setFilter(const QString& text)
+{
+	filters.clear();
+	if (!text.isEmpty()) {
+		for (const auto &s : text.split(QRegularExpression{"\\s+"})) {
+			if (const int split = s.indexOf(":"); split == -1)
+				filters.append({"", s.trimmed()});
+			else
+				filters.append({s.left(split).trimmed(), s.mid(split+1).trimmed()});
+		}
+	}
+	invalidateFilter();
+}
+
+bool EventFilter::remove(int row)
+{
+	return removeRows(row, 1);
+}
+
+// Check if any of the given values match name: value.
+static bool matches(const QVariantMap& values, const QString& name, const QString& value)
+{
+	for (auto kv = values.constKeyValueBegin(); kv != values.constKeyValueEnd(); kv++) {
+		const auto& [fieldName, fieldValue] = *kv;
+		if (!name.isEmpty() && !fieldName.startsWith(name))
+			continue;
+
+		switch (fieldValue.type()) {
+		case QMetaType::QString:
+			// Prepend = to value for exact match.
+			if (value.startsWith("=")) {
+				if (fieldValue.toString() == value.mid(1))
+					return true;
+			} else {
+				if (fieldValue.toString().contains(value))
+					return true;
+			}
+			break;
+		case QMetaType::Bool:
+			// Prepend ! to value for inverted match.
+			if (value.startsWith("!")) {
+				if (fieldName.startsWith(value.mid(1)) && !fieldValue.toBool())
+					return true;
+			} else {
+				if (fieldName.startsWith(value) && fieldValue.toBool())
+					return true;
+			}
+			break;
+		default:
+			break;
+		}
+	}
+	return false;
+}
+
+bool EventFilter::filterAcceptsRow(int sourceRow, const QModelIndex& sourceParent) const
+{
+	const auto& model = sourceModel();
+	const auto& index = model->index(sourceRow, 0, sourceParent);
+
+	const auto& roles = model->roleNames();
+	const auto& tag = model->data(index, roles.key("tag")).toString();
+	const auto& values = model->data(index, roles.key("values")).toMap();
+
+	for (const auto& filter : filters) {
+		if (filter.first.isEmpty() && tag.startsWith(filter.second))
+			continue;
+		if (matches(values, filter.first, filter.second))
+			continue;
+		return false;
+	}
+	return true;
+}

event_filter.h

@@ -0,0 +1,25 @@
+#ifndef EVENT_FILTER_H
+#define EVENT_FILTER_H
+
+#include <QList>
+#include <QPair>
+#include <QSortFilterProxyModel>
+#include <QString>
+#include <qqml.h>
+
+class EventFilter : public QSortFilterProxyModel
+{
+	Q_OBJECT
+	QML_ELEMENT
+public slots:
+	void setFilter(const QString& filter = "");
+	bool remove(int row);
+
+protected:
+	bool filterAcceptsRow(int sourceRow, const QModelIndex& sourceParent) const override;
+
+private:
+	QList<QPair<QString, QString>> filters;
+};
+
+#endif

event_list.cpp

@@ -58,11 +58,11 @@ bool EventList::setData(const QModelIndex& index, const QVariant& value, int rol
 	return true;
 }
 
-int EventList::insert(const int time)
+int EventList::insert(const QString& tag, const int time)
 {
 	int row = time == -1 ? rowCount() : find(time);
 	beginInsertRows(QModelIndex{}, row, row);
-	events.insert(row, {time});
+	events.insert(row, {time, tag});
 	endInsertRows();
 	return row;
 }

event_list.h

@@ -20,8 +20,8 @@ public:
 	bool setData(const QModelIndex& index, const QVariant& value, int role);
 
 public slots:
-	int insert(const int time = -1);
-	bool removeRows(int row, int count = 1, const QModelIndex &parent = {});
+	int insert(const QString& tag = {}, const int time = -1);
+	bool removeRows(int row, int count = 1, const QModelIndex& parent = {});
 	void load(const QJsonObject& json);
 	QJsonObject save() const;
 
@@ -36,8 +36,8 @@ private:
 	};
 	enum Role { Time = Qt::UserRole + 1, Tag, Values };
 
-	QStringList tagsOrder;
 	QJsonObject tags;
+	QStringList tagsOrder;
 	QList<Event> events;
 
 	int find(long long time) const;

fuzbal.pro

@@ -7,8 +7,8 @@ DEFINES += GIT_VERSION=\\\"$$system(git -C "$$_PRO_FILE_PWD_" describe --always
 QML_IMPORT_NAME = fuzbal
 QML_IMPORT_MAJOR_VERSION = 1
 
-SOURCES += event_list.cpp main.cpp
-HEADERS += event_list.h io.h
+SOURCES += event_filter.cpp event_list.cpp main.cpp
+HEADERS += event_filter.h event_list.h io.h
 
 RESOURCES += main.qrc icons.qrc
 TRANSLATIONS += translations/fuzbal_sl.ts