Make the legend interactive

gpxsee.pro

@@ -23,6 +23,7 @@ greaterThan(QT_MAJOR_VERSION, 5) {
 CONFIG += object_parallel_to_source
 INCLUDEPATH += ./src
 HEADERS += src/common/config.h \
+    src/GUI/legendentryitem.h \
     src/GUI/legenditem.h \
     src/common/garmin.h \
     src/common/coordinates.h \
@@ -277,6 +278,7 @@ HEADERS += src/common/config.h \
     src/data/geojsonparser.h
 
 SOURCES += src/main.cpp \
+    src/GUI/legendentryitem.cpp \
     src/GUI/legenditem.cpp \
     src/common/coordinates.cpp \
     src/common/rectc.cpp \

src/GUI/legendentryitem.cpp

@@ -0,0 +1,72 @@
+#include <QPainter>
+#include <QCursor>
+#include "font.h"
+#include "legendentryitem.h"
+
+#define PADDING 2
+
+LegendEntryItem::LegendEntryItem(const QColor &color, const QString &text,
+  QGraphicsItem *parent) : QGraphicsItem(parent), _color(color), _text(text)
+{
+	_textColor = Qt::black;
+	_font.setPixelSize(FONT_SIZE);
+	_font.setFamily(FONT_FAMILY);
+
+	QFontMetrics fm(_font);
+	_boundingRect = QRectF(0, 0, FONT_SIZE * 2 + PADDING * 2
+	  + fm.tightBoundingRect(text).width() + PADDING * 2,
+	  FONT_SIZE + PADDING * 2);
+
+	setCursor(Qt::ArrowCursor);
+	setAcceptHoverEvents(true);
+}
+
+void LegendEntryItem::paint(QPainter *painter,
+  const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+	Q_UNUSED(option);
+	Q_UNUSED(widget);
+	QFontMetrics fm(_font);
+
+	painter->setRenderHint(QPainter::Antialiasing, false);
+
+	painter->setFont(_font);
+	painter->setBrush(_color);
+	painter->setPen(QPen(Qt::black));
+	painter->drawRect(PADDING, PADDING, FONT_SIZE * 2, FONT_SIZE);
+	painter->setPen(QPen(_textColor));
+	painter->drawText(FONT_SIZE * 2 + PADDING * 2 + PADDING,
+	  PADDING + fm.ascent(), _text);
+
+	//painter->setPen(Qt::red);
+	//painter->setBrush(Qt::NoBrush);
+	//painter->drawRect(boundingRect());
+}
+
+void LegendEntryItem::setTextColor(const QColor &color)
+{
+	_textColor = color;
+	update();
+}
+
+void LegendEntryItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
+{
+	Q_UNUSED(event);
+
+	_font.setBold(true);
+	setZValue(zValue() + 1.0);
+	update();
+
+	emit selected(true);
+}
+
+void LegendEntryItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+	Q_UNUSED(event);
+
+	_font.setBold(false);
+	setZValue(zValue() - 1.0);
+	update();
+
+	emit selected(false);
+}

src/GUI/legendentryitem.h

@@ -0,0 +1,34 @@
+#ifndef LEGENDENTRYITEM_H
+#define LEGENDENTRYITEM_H
+
+#include <QGraphicsItem>
+#include <QFont>
+
+class LegendEntryItem : public QObject, public QGraphicsItem
+{
+	Q_OBJECT
+
+public:
+	LegendEntryItem(const QColor &color, const QString &text,
+	  QGraphicsItem *parent = 0);
+
+	QRectF boundingRect() const {return _boundingRect;}
+	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+	  QWidget *widget);
+
+	void setTextColor(const QColor &color);
+
+signals:
+	void selected(bool);
+
+private:
+	void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
+	void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+
+	QRectF _boundingRect;
+	QColor _color, _textColor;
+	QString _text;
+	QFont _font;
+};
+
+#endif // LEGENDENTRYITEM_H

src/GUI/legenditem.cpp

@@ -1,17 +1,17 @@
 #include <cmath>
 #include <QPainter>
+#include <QFileInfo>
 #include "font.h"
+#include "pathitem.h"
+#include "graphitem.h"
+#include "planeitem.h"
+#include "legendentryitem.h"
 #include "legenditem.h"
 
-#define PADDING 4
-
 LegendItem::LegendItem(QGraphicsItem *parent) : QGraphicsItem(parent)
 {
-	_color = Qt::black;
 	_bgColor = Qt::white;
 	_drawBackground = false;
-	_font.setPixelSize(FONT_SIZE);
-	_font.setFamily(FONT_FAMILY);
 }
 
 void LegendItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
@@ -28,21 +28,6 @@ void LegendItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option
 		bc.setAlpha(196);
 		painter->setBrush(QBrush(bc));
 		painter->drawRect(_boundingRect);
-		painter->setBrush(Qt::NoBrush);
-	}
-
-	QFontMetrics fm(_font);
-	painter->setFont(_font);
-
-	for (int i = 0; i < _items.size(); i++) {
-		const Item &itm = _items.at(i);
-
-		painter->setBrush(itm.color);
-		painter->setPen(QPen(Qt::black));
-		painter->drawRect(0, i * (FONT_SIZE + PADDING), FONT_SIZE * 2, FONT_SIZE);
-		painter->setPen(QPen(_color));
-		painter->drawText(FONT_SIZE * 2 + PADDING, i * (FONT_SIZE + PADDING)
-		  + fm.ascent(), itm.text);
 	}
 
 	//painter->setPen(Qt::red);
@@ -50,23 +35,43 @@ void LegendItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option
 	//painter->drawRect(boundingRect());
 }
 
-void LegendItem::addItem(const QColor &color, const QString &text)
+void LegendItem::addItem(PathItem *item)
 {
 	prepareGeometryChange();
 
-	_items.append(Item(color, text));
+	LegendEntryItem *li = new LegendEntryItem(item->color(),
+	  item->name().isEmpty() ? QFileInfo(item->file()).fileName() : item->name(),
+	  this);
+	li->setPos(0, _items.size() * li->boundingRect().height());
 
-	QFontMetrics fm(_font);
-	qreal maxWidth = qMax((int)_boundingRect.width() - (FONT_SIZE * 2 + PADDING),
-	  fm.tightBoundingRect(text).width());
-	_boundingRect = QRectF(0, 0, FONT_SIZE * 2 + PADDING + maxWidth,
-	  _items.size() * (FONT_SIZE + PADDING) - (PADDING - 1));
+	_items.append(li);
+
+	_boundingRect = QRectF(0, 0, qMax(_boundingRect.width(),
+	  li->boundingRect().width()), _items.size() * li->boundingRect().height());
+
+	QObject::connect(li, &LegendEntryItem::selected, item, &PathItem::hoverAll);
+}
+
+void LegendItem::addItem(PlaneItem *item)
+{
+	if (item->name().isEmpty())
+		return;
+
+	prepareGeometryChange();
+
+	LegendEntryItem *li = new LegendEntryItem(item->color(), item->name(), this);
+	li->setPos(0, _items.size() * li->boundingRect().height());
+
+	_items.append(li);
+
+	_boundingRect = QRectF(0, 0, qMax(_boundingRect.width(),
+	  li->boundingRect().width()), _items.size() * li->boundingRect().height());
 }
 
 void LegendItem::setColor(const QColor &color)
 {
-	_color = color;
-	update();
+	for (int i = 0; i < _items.size(); i++)
+		_items.at(i)->setTextColor(color);
 }
 
 void LegendItem::setBackgroundColor(const QColor &color)
@@ -84,6 +89,8 @@ void LegendItem::drawBackground(bool draw)
 void LegendItem::clear()
 {
 	prepareGeometryChange();
+
+	qDeleteAll(_items);
 	_items.clear();
 	_boundingRect = QRectF();
 }

src/GUI/legenditem.h

@@ -3,7 +3,11 @@
 
 #include <QGraphicsItem>
 
-class LegendItem  : public QGraphicsItem
+class LegendEntryItem;
+class PathItem;
+class PlaneItem;
+
+class LegendItem : public QGraphicsItem
 {
 public:
 	LegendItem(QGraphicsItem *parent = 0);
@@ -12,27 +16,18 @@ public:
 	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
 	  QWidget *widget);
 
+	void addItem(PathItem *item);
+	void addItem(PlaneItem *item);
 	void setDigitalZoom(qreal zoom);
-	void addItem(const QColor &color, const QString &text);
 	void setColor(const QColor &color);
 	void setBackgroundColor(const QColor &color);
 	void drawBackground(bool draw);
 	void clear();
 
 private:
-	struct Item
-	{
-		Item(const QColor &color, const QString &text)
-		  : color(color), text(text) {}
-
-		QColor color;
-		QString text;
-	};
-
-	QList<Item> _items;
+	QList<LegendEntryItem*> _items;
 	QRectF _boundingRect;
-	QColor _color, _bgColor;
-	QFont _font;
+	QColor _bgColor;
 	bool _drawBackground;
 };
 

src/GUI/mapview.cpp

@@ -153,30 +153,18 @@ void MapView::updateLegend()
 
 	if (_showTracks) {
 		for (int i = 0; i < _tracks.size(); i++)
-			addLegendEntry(_tracks.at(i));
+			_legend->addItem(_tracks.at(i));
 	}
 	if (_showRoutes) {
 		for (int i = 0; i < _routes.size(); i++)
-			addLegendEntry(_routes.at(i));
+			_legend->addItem(_routes.at(i));
 	}
 	if (_showAreas) {
 		for (int i = 0; i < _areas.size(); i++)
-			addLegendEntry(_areas.at(i));
+			_legend->addItem(_areas.at(i));
 	}
 }
 
-void MapView::addLegendEntry(const PathItem *ti)
-{
-	_legend->addItem(ti->color(), ti->name().isEmpty()
-	  ? QFileInfo(ti->file()).fileName() : ti->name());
-}
-
-void MapView::addLegendEntry(const PlaneItem *plane)
-{
-	if (!plane->name().isEmpty())
-		_legend->addItem(plane->color(), plane->name());
-}
-
 PathItem *MapView::addTrack(const Track &track)
 {
 	if (!track.isValid()) {
@@ -204,7 +192,7 @@ PathItem *MapView::addTrack(const Track &track)
 
 	if (_showTracks) {
 		addPOI(_poi->points(ti->path()));
-		addLegendEntry(ti);
+		_legend->addItem(ti);
 	}
 
 	return ti;
@@ -238,7 +226,7 @@ PathItem *MapView::addRoute(const Route &route)
 
 	if (_showRoutes) {
 		addPOI(_poi->points(ri->path()));
-		addLegendEntry(ri);
+		_legend->addItem(ri);
 	}
 
 	return ri;
@@ -266,7 +254,7 @@ void MapView::addArea(const Area &area)
 
 	if (_showAreas) {
 		addPOI(_poi->points(ai->bounds()));
-		addLegendEntry(ai);
+		_legend->addItem(ai);
 	}
 }
 
@@ -309,7 +297,7 @@ MapItem *MapView::addMap(MapAction *map)
 
 	if (_showAreas) {
 		addPOI(_poi->points(mi->bounds()));
-		addLegendEntry(mi);
+		_legend->addItem(mi);
 	}
 
 	return mi;

src/GUI/mapview.h

@@ -168,8 +168,6 @@ private:
 	void pinchGesture(QPinchGesture *gesture);
 	void skipColor() {_palette.nextColor();}
 	void setHidpi(bool hidpi);
-	void addLegendEntry(const PathItem *path);
-	void addLegendEntry(const PlaneItem *plane);
 	void updateLegend();
 
 	void mouseMoveEvent(QMouseEvent *event);

src/GUI/pathitem.cpp

@@ -388,9 +388,9 @@ void PathItem::drawMarkerBackground(bool draw)
 	_markerInfo->drawBackground(draw);
 }
 
-void PathItem::hover(bool hover)
+void PathItem::hover(bool hvr)
 {
-	if (hover) {
+	if (hvr) {
 		_pen.setWidth((width() + 1) * pow(2, -_digitalZoom));
 		setZValue(zValue() + 1.0);
 	} else {
@@ -401,6 +401,12 @@ void PathItem::hover(bool hover)
 	update();
 }
 
+void PathItem::hoverAll(bool hvr)
+{
+	hover(hvr);
+	emit selected(hvr);
+}
+
 void PathItem::showMarker(bool show)
 {
 	if (_showMarker == show)

src/GUI/pathitem.h

@@ -60,7 +60,8 @@ public:
 	static void setTimeZone(const QTimeZone &zone) {_timeZone = zone;}
 
 public slots:
-	void hover(bool hover);
+	void hover(bool hvr);
+	void hoverAll(bool hvr);
 
 signals:
 	void selected(bool);