FIX(ui): Use correct font size for scaling status icons

Previously (#5772), we implemented a fix to set the status icon size
according to the user display scaling. The calculation is based upon
font sizes. However, due to an oversight, the wrong font size was used
as the base for this calculation. However, the problem was not visible,
if by coincidence the correct font size was the same as the one used by
accident.

This commit changes the calculation of the icon size once again to use
the correct font information.

Fixes one part of #5817

(cherry picked from commit a587514c2f49dbc65b8cb7c9710fe183b2c750a6)

2 files changed, 65 insertions, 48 deletions

diff --git a/src/mumble/UserView.cpp b/src/mumble/UserView.cpp
index bce85ed08..dac97d129 100644
--- a/src/mumble/UserView.cpp
+++ b/src/mumble/UserView.cpp
@@ -18,11 +18,13 @@
 #include <QtGui/QPainter>
 #include <QtWidgets/QWhatsThis>
 
-UserDelegate::UserDelegate(QObject *p, int flagTotalDimension, int flagIconPadding, int flagIconDimension)
-	: QStyledItemDelegate(p) {
-	m_flagTotalDimension = flagTotalDimension;
-	m_flagIconDimension  = flagIconDimension;
-	m_flagIconPadding    = flagIconPadding;
+UserDelegate::UserDelegate(QObject *p) : QStyledItemDelegate(p) {
+}
+
+void UserDelegate::adjustIcons(int iconTotalDimension, int iconIconPadding, int iconIconDimension) {
+	m_iconTotalDimension = iconTotalDimension;
+	m_iconIconPadding    = iconIconPadding;
+	m_iconIconDimension  = iconIconDimension;
 }
 
 void UserDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
@@ -62,8 +64,8 @@ void UserDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
 	// draw background
 	style->drawPrimitive(QStyle::PE_PanelItemViewItem, &o, painter, o.widget);
 
-	// resize rect to exclude the flag icons
-	o.rect = option.rect.adjusted(0, 0, -m_flagTotalDimension * ql.count(), 0);
+	// resize rect to exclude the icons
+	o.rect = option.rect.adjusted(0, 0, -m_iconTotalDimension * ql.count(), 0);
 
 	// draw icon
 	QRect decorationRect = style->subElementRect(QStyle::SE_ItemViewItemDecoration, &o, o.widget);
@@ -75,14 +77,14 @@ void UserDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
 	painter->setFont(o.font);
 	style->drawItemText(painter, textRect, o.displayAlignment, o.palette, true, itemText, colorRole);
 
-	// draw flag icons to original rect
-	QRect ps = QRect(option.rect.right() - (ql.size() * m_flagTotalDimension), option.rect.y(),
-					 ql.size() * m_flagTotalDimension, option.rect.height());
+	// draw icons to original rect
+	QRect ps = QRect(option.rect.right() - (ql.size() * m_iconTotalDimension), option.rect.y(),
+					 ql.size() * m_iconTotalDimension, option.rect.height());
 
 	for (int i = 0; i < ql.size(); ++i) {
 		QRect r = ps;
-		r.setSize(QSize(m_flagIconDimension, m_flagIconDimension));
-		r.translate(i * m_flagTotalDimension + m_flagIconPadding, m_flagIconPadding);
+		r.setSize(QSize(m_iconIconDimension, m_iconIconDimension));
+		r.translate(i * m_iconTotalDimension + m_iconIconPadding, m_iconIconPadding);
 		QRect p = QStyle::alignedRect(option.direction, option.decorationAlignment, r.size(), r);
 		qvariant_cast< QIcon >(ql[i]).paint(painter, p, option.decorationAlignment, iconMode, QIcon::On);
 	}
@@ -96,11 +98,11 @@ bool UserDelegate::helpEvent(QHelpEvent *evt, QAbstractItemView *view, const QSt
 		const QAbstractItemModel *m      = index.model();
 		const QModelIndex firstColumnIdx = index.sibling(index.row(), 1);
 		QVariant data                    = m->data(firstColumnIdx);
-		QList< QVariant > flagList       = data.toList();
-		const int offset                 = flagList.size() * -m_flagTotalDimension;
-		const int firstFlagPos           = option.rect.topRight().x() + offset;
+		QList< QVariant > iconList       = data.toList();
+		const int offset                 = iconList.size() * -m_iconTotalDimension;
+		const int firstIconPos           = option.rect.topRight().x() + offset;
 
-		if (evt->pos().x() >= firstFlagPos) {
+		if (evt->pos().x() >= firstIconPos) {
 			return QStyledItemDelegate::helpEvent(evt, view, option, firstColumnIdx);
 		}
 	}
@@ -108,15 +110,27 @@ bool UserDelegate::helpEvent(QHelpEvent *evt, QAbstractItemView *view, const QSt
 }
 
 UserView::UserView(QWidget *p) : QTreeView(p) {
+	m_userDelegate = new UserDelegate(this);
+	adjustIcons();
+	setItemDelegate(m_userDelegate);
+
+	// Because in Qt fonts take some time to initialize properly, we have to delay the call
+	// to adjustIcons a bit in order to give the fonts the necessary time (so we can read out
+	// the actual font details).
+	QTimer::singleShot(0, [this]() { adjustIcons(); });
+
+	connect(this, SIGNAL(doubleClicked(const QModelIndex &)), this, SLOT(nodeActivated(const QModelIndex &)));
+}
+
+void UserView::adjustIcons() {
 	// Calculate the icon size for status icons based on font size
 	// This should automaticially adjust size when the user has
 	// display scaling enabled
-	m_flagTotalDimension  = QFontMetrics(p->font()).height();
-	int flagIconPadding   = 1;
-	int flagIconDimension = m_flagTotalDimension - (4 * flagIconPadding);
-	setItemDelegate(new UserDelegate(this, m_flagTotalDimension, flagIconPadding, flagIconDimension));
-
-	connect(this, SIGNAL(doubleClicked(const QModelIndex &)), this, SLOT(nodeActivated(const QModelIndex &)));
+	m_iconTotalDimension  = QFontMetrics(font()).height();
+	int iconIconPadding   = 1;
+	int iconIconDimension = m_iconTotalDimension - (2 * iconIconPadding);
+	m_userDelegate->adjustIcons(m_iconTotalDimension, iconIconPadding, iconIconDimension);
+	viewport()->update();
 }
 
 /**
@@ -136,7 +150,7 @@ bool UserView::event(QEvent *evt) {
 
 /**
  * This function is used to create custom behaviour when clicking
- * on user/channel flags (e.Global::get(). showing the comment)
+ * on user/channel icons (e.Global::get(). showing the comment)
  */
 void UserView::mouseReleaseEvent(QMouseEvent *evt) {
 	QPoint clickPosition = evt->pos();
@@ -150,55 +164,55 @@ void UserView::mouseReleaseEvent(QMouseEvent *evt) {
 		// This is the x offset of the _beginning_ of the comment icon starting from the
 		// right.
 		// Thus if the comment icon is the last icon that is displayed, this is equal to
-		// the negative width of a flag's width (which it is initialized to here). For
-		// every flag that is displayed to the right of the comment flag, we have to subtract
-		// m_flagTotalDimension once.
-		int commentFlagPxOffset = -m_flagTotalDimension;
+		// the negative width of a icon's width (which it is initialized to here). For
+		// every icon that is displayed to the right of the comment icon, we have to subtract
+		// m_iconTotalDimension once.
+		int commentIconPxOffset = -m_iconTotalDimension;
 		bool hasComment         = false;
 
 		if (clientUser && !clientUser->qbaCommentHash.isEmpty()) {
 			hasComment = true;
 
 			if (clientUser->bLocalIgnore)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bRecording)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bPrioritySpeaker)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bMute)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bSuppress)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bSelfMute)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bLocalMute)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bSelfDeaf)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->bDeaf)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (!clientUser->qsFriendName.isEmpty())
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			if (clientUser->iId >= 0)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 
 		} else if (channel && !channel->qbaDescHash.isEmpty()) {
 			hasComment = true;
 
 			if (channel->bFiltered)
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 
 			if (channel->hasEnterRestrictions) {
-				commentFlagPxOffset -= m_flagTotalDimension;
+				commentIconPxOffset -= m_iconTotalDimension;
 			}
 		}
 
 		if (hasComment) {
 			QRect r                    = visualRect(idx);
-			const int commentFlagPxPos = r.topRight().x() + commentFlagPxOffset;
+			const int commentIconPxPos = r.topRight().x() + commentIconPxOffset;
 
-			if ((clickPosition.x() >= commentFlagPxPos)
-				&& (clickPosition.x() <= (commentFlagPxPos + m_flagTotalDimension))) {
+			if ((clickPosition.x() >= commentIconPxPos)
+				&& (clickPosition.x() <= (commentIconPxPos + m_iconTotalDimension))) {
 				// Clicked comment icon
 				QString str = userModel->data(idx, Qt::ToolTipRole).toString();
 				if (str.isEmpty()) {
diff --git a/src/mumble/UserView.h b/src/mumble/UserView.h
index 55ae1d379..41b496234 100644
--- a/src/mumble/UserView.h
+++ b/src/mumble/UserView.h
@@ -17,13 +17,14 @@ private:
 	Q_OBJECT
 	Q_DISABLE_COPY(UserDelegate)
 
-	int m_flagTotalDimension;
-	int m_flagIconPadding;
-	int m_flagIconDimension;
+	int m_iconTotalDimension;
+	int m_iconIconPadding;
+	int m_iconIconDimension;
 
 public:
-	UserDelegate(QObject *parent, int flagTotalDimension, int flagIconPadding, int flagIconDimension);
+	UserDelegate(QObject *parent);
 	void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE;
+	void adjustIcons(int iconTotalDimension, int iconIconPadding, int iconIconDimension);
 
 public slots:
 	bool helpEvent(QHelpEvent *event, QAbstractItemView *view, const QStyleOptionViewItem &option,
@@ -35,7 +36,9 @@ private:
 	Q_OBJECT
 	Q_DISABLE_COPY(UserView)
 
-	int m_flagTotalDimension;
+	int m_iconTotalDimension;
+	UserDelegate *m_userDelegate;
+	void adjustIcons();
 
 protected:
 	void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;