Examples: move widgets/codeeditor into manual tests

It's not a very well written example, using (largely unneed) hacks to
implement what it does. It's also misleading - the syntaxhighlighter
example is a better showcase for building a useful code editor.

Move it to manual tests.

Fixes: QTBUG-111025
Pick-to: 6.5
Change-Id: I405d41688235bf3e9a08373e716769f26d02fec6
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

9 files changed, 0 insertions, 446 deletions

diff --git a/examples/widgets/doc/src/codeeditor.qdoc b/examples/widgets/doc/src/codeeditor.qdoc
deleted file mode 100644
index 80c11db69d..0000000000
--- a/examples/widgets/doc/src/codeeditor.qdoc
+++ /dev/null
@@ -1,173 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
-
-/*!
-    \example widgets/codeeditor
-    \title Code Editor Example
-    \ingroup examples-widgets
-    \brief The Code Editor example shows how to create a simple editor that
-    has line numbers and that highlights the current line.
-
-    \borderedimage codeeditor-example.png
-
-    As can be seen from the image, the editor displays the line
-    numbers in an area to the left of the area for editing. The editor
-    will highlight the line containing the cursor.
-
-    We implement the editor in \c CodeEditor, which is a widget that
-    inherits QPlainTextEdit. We keep a separate widget in \c
-    CodeEditor (\c LineNumberArea) onto which we draw the line
-    numbers.
-
-    QPlainTextEdit inherits from QAbstractScrollArea, and editing
-    takes place within its \l{QAbstractScrollArea::}{viewport()}'s
-    margins. We make room for our line number area by setting the left
-    margin of the viewport to the size we need to draw the line
-    numbers.
-
-    When it comes to editing code, we prefer QPlainTextEdit over
-    QTextEdit because it is optimized for handling plain text. See
-    the QPlainTextEdit class description for details.
-
-    QPlainTextEdit lets us add selections in addition to the
-    selection the user can make with the mouse or keyboard. We use
-    this functionality to highlight the current line. More on this
-    later.
-
-    We will now move on to the definitions and implementations of \c
-    CodeEditor and \c LineNumberArea. Let's start with the \c
-    LineNumberArea class.
-
-    \section1 The LineNumberArea Class
-
-    We paint the line numbers on this widget, and place it over the \c
-    CodeEditor's \l{QAbstractScrollArea::}{viewport()}'s left margin
-    area.
-
-    We need to use protected functions in QPlainTextEdit while
-    painting the area. So to keep things simple, we  paint the area in
-    the \c CodeEditor class. The area also asks the editor to
-    calculate its size hint.
-
-    Note that we could simply paint the line numbers directly on the
-    code editor, and drop the LineNumberArea class. However, the
-    QWidget class helps us to \l{QWidget::}{scroll()} its contents.
-    Also, having a separate widget is the right choice if we wish to
-    extend the editor with breakpoints or other code editor features.
-    The widget would then help in the handling of mouse events.
-
-    \snippet widgets/codeeditor/codeeditor.h extraarea
-
-    \section1 CodeEditor Class Definition
-
-    Here is the code editor's class definition:
-
-    \snippet widgets/codeeditor/codeeditor.h codeeditordefinition
-
-    In the editor we resize and draw the line numbers on the \c
-    LineNumberArea. We need to do this when the number of lines in the
-    editor changes, and when the editor's viewport() is scrolled. Of
-    course, it is also done when the editor's size changes. We do
-    this in \c updateLineNumberWidth() and \c updateLineNumberArea().
-
-    Whenever, the cursor's position changes, we highlight the current
-    line in \c highlightCurrentLine().
-
-    \section1 CodeEditor Class Implementation
-
-    We will now go through the code editors implementation, starting
-    off with the constructor.
-
-    \snippet widgets/codeeditor/codeeditor.cpp constructor
-
-    In the constructor we connect our slots to signals in
-    QPlainTextEdit. It is necessary to calculate the line number area
-    width and highlight the first line when the editor is created.
-
-    \snippet widgets/codeeditor/codeeditor.cpp extraAreaWidth
-
-    The \c lineNumberAreaWidth() function calculates the width of the
-    \c LineNumberArea widget. We take the number of digits in the last
-    line of the editor and multiply that with the maximum width of a
-    digit.
-
-    \snippet widgets/codeeditor/codeeditor.cpp slotUpdateExtraAreaWidth
-
-    When we update the width of the line number area, we simply call
-    QAbstractScrollArea::setViewportMargins().
-
-    \snippet widgets/codeeditor/codeeditor.cpp slotUpdateRequest
-
-    This slot is invoked when the editors viewport has been scrolled.
-    The QRect given as argument is the part of the editing area that
-    is do be updated (redrawn). \c dy holds the number of pixels the
-    view has been scrolled vertically.
-
-    \snippet widgets/codeeditor/codeeditor.cpp resizeEvent
-
-    When the size of the editor changes, we also need to resize the
-    line number area.
-
-    \snippet widgets/codeeditor/codeeditor.cpp cursorPositionChanged
-
-    When the cursor position changes, we highlight the current line,
-    i.e., the line containing the cursor.
-
-    QPlainTextEdit gives the possibility to have more than one
-    selection at the same time. we can set the character format
-    (QTextCharFormat) of these selections. We clear the cursors
-    selection before setting the new new
-    QPlainTextEdit::ExtraSelection, else several lines would get
-    highlighted when the user selects multiple lines with the mouse.
-    \omit ask someone how this works \endomit
-
-    One sets the selection with a text cursor. When using the
-    FullWidthSelection property, the current cursor text block (line)
-    will be selected. If you want to select just a portion of the text
-    block, the cursor should be moved with QTextCursor::movePosition()
-    from a position set with \l{QTextCursor::}{setPosition()}.
-
-    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_0
-
-    The \c lineNumberAreaPaintEvent() is called from \c LineNumberArea
-    whenever it receives a paint event. We start off by painting the
-    widget's background.
-
-    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_1
-
-    We will now loop through all visible lines and paint the line
-    numbers in the extra area for each line. Notice that in a plain
-    text edit each line will consist of one QTextBlock; though, if
-    line wrapping is enabled, a line may span several rows in the text
-    edit's viewport.
-
-    We get the top and bottom y-coordinate of the first text block,
-    and adjust these values by the height of the current text block in
-    each iteration in the loop.
-
-    \snippet widgets/codeeditor/codeeditor.cpp extraAreaPaintEvent_2
-
-    Notice that we check if the block is visible in addition to check
-    if it is in the areas viewport - a block can, for example, be
-    hidden by a window placed over the text edit.
-
-    \section1 Suggestions for Extending the Code Editor
-
-    No self-respecting code editor is without a syntax
-    highligther; the \l{Syntax Highlighter Example} shows how to
-    create one.
-
-    In addition to line numbers, you can add more to the extra area,
-    for instance, break points.
-
-    QSyntaxHighlighter gives the possibility to add user data to each
-    text block with
-    \l{QSyntaxHighlighter::}{setCurrentBlockUserData()}. This can be
-    used to implement parenthesis matching. In the \c
-    highlightCurrentLine(), the data of the currentBlock() can be
-    fetched with QTextBlock::userData(). Matching parentheses can be
-    highlighted with an extra selection. The "Matching Parentheses
-    with QSyntaxHighlighter" article in Qt Quarterly 31 implements
-    this. You find it here: \l{http://doc.qt.io/archives/qq/}.
-
-*/
diff --git a/examples/widgets/doc/src/syntaxhighlighter.qdoc b/examples/widgets/doc/src/syntaxhighlighter.qdoc
index 1b4ef2561b..bdd13abdf3 100644
--- a/examples/widgets/doc/src/syntaxhighlighter.qdoc
+++ b/examples/widgets/doc/src/syntaxhighlighter.qdoc
@@ -219,10 +219,4 @@
     function. The QSyntaxHighlighter class also provides the \l
     {QSyntaxHighlighter::document()}{document()} function which
     returns the currently set document.
-
-    \section1 Other Code Editor Features
-
-    The \l{Code Editor Example} shows how to implement line
-    numbers and how to highlight the current line.
-
 */
diff --git a/examples/widgets/widgets/CMakeLists.txt b/examples/widgets/widgets/CMakeLists.txt
index ee90c019b0..d852233c8d 100644
--- a/examples/widgets/widgets/CMakeLists.txt
+++ b/examples/widgets/widgets/CMakeLists.txt
@@ -5,7 +5,6 @@ qt_internal_add_example(analogclock)
 qt_internal_add_example(calculator)
 qt_internal_add_example(calendarwidget)
 qt_internal_add_example(charactermap)
-qt_internal_add_example(codeeditor)
 qt_internal_add_example(digitalclock)
 qt_internal_add_example(groupbox)
 qt_internal_add_example(icons)
diff --git a/examples/widgets/widgets/codeeditor/CMakeLists.txt b/examples/widgets/widgets/codeeditor/CMakeLists.txt
deleted file mode 100644
index 0e8a3b49ff..0000000000
--- a/examples/widgets/widgets/codeeditor/CMakeLists.txt
+++ /dev/null
@@ -1,37 +0,0 @@
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: BSD-3-Clause
-
-cmake_minimum_required(VERSION 3.16)
-project(codeeditor LANGUAGES CXX)
-
-if(NOT DEFINED INSTALL_EXAMPLESDIR)
-    set(INSTALL_EXAMPLESDIR "examples")
-endif()
-
-set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/widgets/codeeditor")
-
-find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
-
-qt_standard_project_setup()
-
-qt_add_executable(codeeditor
-    codeeditor.cpp codeeditor.h
-    main.cpp
-)
-
-set_target_properties(codeeditor PROPERTIES
-    WIN32_EXECUTABLE TRUE
-    MACOSX_BUNDLE TRUE
-)
-
-target_link_libraries(codeeditor PRIVATE
-    Qt6::Core
-    Qt6::Gui
-    Qt6::Widgets
-)
-
-install(TARGETS codeeditor
-    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
-    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
-    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
-)
diff --git a/examples/widgets/widgets/codeeditor/codeeditor.cpp b/examples/widgets/widgets/codeeditor/codeeditor.cpp
deleted file mode 100644
index 15f84622e4..0000000000
--- a/examples/widgets/widgets/codeeditor/codeeditor.cpp
+++ /dev/null
@@ -1,134 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-#include "codeeditor.h"
-
-#include <QPainter>
-#include <QTextBlock>
-
-//![constructor]
-
-CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
-{
-    lineNumberArea = new LineNumberArea(this);
-
-    connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth);
-    connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea);
-    connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine);
-
-    updateLineNumberAreaWidth(0);
-    highlightCurrentLine();
-}
-
-//![constructor]
-
-//![extraAreaWidth]
-
-int CodeEditor::lineNumberAreaWidth()
-{
-    int digits = 1;
-    int max = qMax(1, blockCount());
-    while (max >= 10) {
-        max /= 10;
-        ++digits;
-    }
-
-    int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits;
-
-    return space;
-}
-
-//![extraAreaWidth]
-
-//![slotUpdateExtraAreaWidth]
-
-void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
-{
-    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
-}
-
-//![slotUpdateExtraAreaWidth]
-
-//![slotUpdateRequest]
-
-void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
-{
-    if (dy)
-        lineNumberArea->scroll(0, dy);
-    else
-        lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
-
-    if (rect.contains(viewport()->rect()))
-        updateLineNumberAreaWidth(0);
-}
-
-//![slotUpdateRequest]
-
-//![resizeEvent]
-
-void CodeEditor::resizeEvent(QResizeEvent *e)
-{
-    QPlainTextEdit::resizeEvent(e);
-
-    QRect cr = contentsRect();
-    lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
-}
-
-//![resizeEvent]
-
-//![cursorPositionChanged]
-
-void CodeEditor::highlightCurrentLine()
-{
-    QList<QTextEdit::ExtraSelection> extraSelections;
-
-    if (!isReadOnly()) {
-        QTextEdit::ExtraSelection selection;
-
-        QColor lineColor = QColor(Qt::yellow).lighter(160);
-
-        selection.format.setBackground(lineColor);
-        selection.format.setProperty(QTextFormat::FullWidthSelection, true);
-        selection.cursor = textCursor();
-        selection.cursor.clearSelection();
-        extraSelections.append(selection);
-    }
-
-    setExtraSelections(extraSelections);
-}
-
-//![cursorPositionChanged]
-
-//![extraAreaPaintEvent_0]
-
-void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
-{
-    QPainter painter(lineNumberArea);
-    painter.fillRect(event->rect(), Qt::lightGray);
-
-//![extraAreaPaintEvent_0]
-
-//![extraAreaPaintEvent_1]
-    QTextBlock block = firstVisibleBlock();
-    int blockNumber = block.blockNumber();
-    int top = qRound(blockBoundingGeometry(block).translated(contentOffset()).top());
-    int bottom = top + qRound(blockBoundingRect(block).height());
-//![extraAreaPaintEvent_1]
-
-//![extraAreaPaintEvent_2]
-    while (block.isValid() && top <= event->rect().bottom()) {
-        if (block.isVisible() && bottom >= event->rect().top()) {
-            QString number = QString::number(blockNumber + 1);
-            painter.setPen(Qt::black);
-            painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
-                             Qt::AlignRight, number);
-        }
-
-        block = block.next();
-        top = bottom;
-        bottom = top + qRound(blockBoundingRect(block).height());
-        ++blockNumber;
-    }
-}
-//![extraAreaPaintEvent_2]
-
diff --git a/examples/widgets/widgets/codeeditor/codeeditor.h b/examples/widgets/widgets/codeeditor/codeeditor.h
deleted file mode 100644
index e8e6a583f0..0000000000
--- a/examples/widgets/widgets/codeeditor/codeeditor.h
+++ /dev/null
@@ -1,68 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-#ifndef CODEEDITOR_H
-#define CODEEDITOR_H
-
-#include <QPlainTextEdit>
-
-QT_BEGIN_NAMESPACE
-class QPaintEvent;
-class QResizeEvent;
-class QSize;
-class QWidget;
-QT_END_NAMESPACE
-
-class LineNumberArea;
-
-//![codeeditordefinition]
-
-class CodeEditor : public QPlainTextEdit
-{
-    Q_OBJECT
-
-public:
-    CodeEditor(QWidget *parent = nullptr);
-
-    void lineNumberAreaPaintEvent(QPaintEvent *event);
-    int lineNumberAreaWidth();
-
-protected:
-    void resizeEvent(QResizeEvent *event) override;
-
-private slots:
-    void updateLineNumberAreaWidth(int newBlockCount);
-    void highlightCurrentLine();
-    void updateLineNumberArea(const QRect &rect, int dy);
-
-private:
-    QWidget *lineNumberArea;
-};
-
-//![codeeditordefinition]
-//![extraarea]
-
-class LineNumberArea : public QWidget
-{
-public:
-    LineNumberArea(CodeEditor *editor) : QWidget(editor), codeEditor(editor)
-    {}
-
-    QSize sizeHint() const override
-    {
-        return QSize(codeEditor->lineNumberAreaWidth(), 0);
-    }
-
-protected:
-    void paintEvent(QPaintEvent *event) override
-    {
-        codeEditor->lineNumberAreaPaintEvent(event);
-    }
-
-private:
-    CodeEditor *codeEditor;
-};
-
-//![extraarea]
-
-#endif
diff --git a/examples/widgets/widgets/codeeditor/codeeditor.pro b/examples/widgets/widgets/codeeditor/codeeditor.pro
deleted file mode 100644
index 5618160d17..0000000000
--- a/examples/widgets/widgets/codeeditor/codeeditor.pro
+++ /dev/null
@@ -1,8 +0,0 @@
-QT += widgets
-
-HEADERS     = codeeditor.h
-SOURCES     = main.cpp \
-              codeeditor.cpp
-# install
-target.path = $$[QT_INSTALL_EXAMPLES]/widgets/widgets/codeeditor
-INSTALLS += target
diff --git a/examples/widgets/widgets/codeeditor/main.cpp b/examples/widgets/widgets/codeeditor/main.cpp
deleted file mode 100644
index 20b72b18ae..0000000000
--- a/examples/widgets/widgets/codeeditor/main.cpp
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-#include <QApplication>
-
-#include "codeeditor.h"
-
-int main(int argv, char **args)
-{
-    QApplication app(argv, args);
-
-    CodeEditor editor;
-    editor.setWindowTitle(QObject::tr("Code Editor Example"));
-    editor.show();
-
-    return app.exec();
-}
-
diff --git a/examples/widgets/widgets/widgets.pro b/examples/widgets/widgets/widgets.pro
index 1dd736e56f..36d428429c 100644
--- a/examples/widgets/widgets/widgets.pro
+++ b/examples/widgets/widgets/widgets.pro
@@ -3,7 +3,6 @@ SUBDIRS       = analogclock \
                 calculator \
                 calendarwidget \
                 charactermap \
-                codeeditor \
                 digitalclock \
                 groupbox \
                 icons \