Editor: modernize line column label

This change contains various adjustments to the line column label:
 - Display the number of selected characters
 - Show the number of cursors instead of the position when multiple text
cursors are present in the current editor
 - show detailed information for each cursor in the line column tooltip

Fixes: QTCREATORBUG-29381
Change-Id: Ib4f36b290797f1d84f268deeb9556e78ae921c37
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/texteditor/texteditor.cpp

@@ -157,7 +157,6 @@ public:
         : FixedSizeClickLabel(parent)
         , m_editor(parent)
     {
-        setMaxText(Tr::tr("Line: 9999, Col: 999"));
         connect(m_editor, &QPlainTextEdit::cursorPositionChanged, this, &LineColumnLabel::update);
         connect(this, &FixedSizeClickLabel::clicked, ActionManager::instance(), [this] {
             emit m_editor->activateEditor(EditorManager::IgnoreNavigationHistory);
@@ -173,18 +172,74 @@ public:
 private:
     void update()
     {
-        const QTextCursor cursor = m_editor->textCursor();
+        const Utils::MultiTextCursor &cursors = m_editor->multiTextCursor();
+        QString text;
+        if (cursors.hasMultipleCursors()) {
+            text = Tr::tr("Cursors: %2").arg(cursors.cursorCount());
+        } else {
+            const QTextCursor cursor = cursors.mainCursor();
             const QTextBlock block = cursor.block();
             const int line = block.blockNumber() + 1;
             const TabSettings &tabSettings = m_editor->textDocument()->tabSettings();
             const int column = tabSettings.columnAt(block.text(), cursor.positionInBlock()) + 1;
-        const QString text = Tr::tr("Line: %1, Col: %2");
+            text = Tr::tr("Line: %1, Col: %2").arg(line).arg(column);
-        setText(text.arg(line).arg(column));
             const QString toolTipText = Tr::tr("Cursor position: %1");
-        setToolTip(toolTipText.arg(QString::number(cursor.position())));
+            setToolTip(toolTipText.arg(cursor.position()));
-        QFont f = font();
+        }
-        f.setItalic(m_editor->multiTextCursor().hasMultipleCursors());
+        int selection = 0;
-        setFont(f);
+        for (const QTextCursor &cursor : cursors)
+            selection += cursor.selectionEnd() - cursor.selectionStart();
+        if (selection > 0)
+            text += " " + Tr::tr("(Sel: %1)").arg(selection);
+        setText(text);
+    }
+
+    bool event(QEvent *event) override
+    {
+        if (event->type() != QEvent::ToolTip)
+            return FixedSizeClickLabel::event(event);
+
+        QString tooltipText = "<table cellpadding='2'>\n";
+
+        const MultiTextCursor multiCursor = m_editor->multiTextCursor();
+        const QList<QTextCursor> cursors = multiCursor.cursors().mid(0, 15);
+
+        tooltipText += "<tr>";
+        tooltipText += QString("<th align='left'>%1</th>").arg(Tr::tr("Cursors:"));
+        tooltipText += QString("<td>%1</td>").arg(multiCursor.cursorCount());
+        tooltipText += "</tr>\n";
+
+        auto addRow = [&](const QString header, auto cellText) {
+            tooltipText += "<tr>";
+            tooltipText += QString("<th align='left'>%1</th>").arg(header);
+            for (const QTextCursor &c : cursors)
+                tooltipText += QString("<td>%1</td>").arg(cellText(c));
+            if (multiCursor.cursorCount() > cursors.count())
+                tooltipText += QString("<td>...</td>");
+            tooltipText += "</tr>\n";
+        };
+
+        addRow(Tr::tr("Line:"), [](const QTextCursor &c) { return c.blockNumber() + 1; });
+
+        const TabSettings &tabSettings = m_editor->textDocument()->tabSettings();
+        addRow(Tr::tr("Column:"), [&](const QTextCursor &c) {
+            return tabSettings.columnAt(c.block().text(), c.positionInBlock()) + 1;
+        });
+
+        addRow(Tr::tr("Selection length:"),
+               [](const QTextCursor &c) { return c.selectionEnd() - c.selectionStart(); });
+
+        addRow(Tr::tr("Position in document:"), [](const QTextCursor &c) { return c.position(); });
+
+        addRow(Tr::tr("Anchor:"), [](const QTextCursor &c) { return c.anchor(); });
+
+        tooltipText += "</table>\n";
+
+        ToolTip::show(static_cast<const QHelpEvent *>(event)->globalPos(),
+                      tooltipText,
+                      Qt::RichText);
+        event->accept();
+        return true;
     }
 
     TextEditorWidget *m_editor;