diff options
| author | Volker Hilsheimer <volker.hilsheimer@qt.io> | 2023-02-08 13:26:22 +0100 |
|---|---|---|
| committer | Volker Hilsheimer <volker.hilsheimer@qt.io> | 2023-02-09 00:23:34 +0100 |
| commit | 48a1a5564f89e1e8f0b6f4a28398e4ae0b3f751c (patch) | |
| tree | 9eb617d59bc9aa66b80fc82eb0aa04cacc166b53 /tests/manual/textrendering/codeeditor/codeeditor.cpp | |
| parent | 3fe0bf6e1bd3713543a5b763d3bfcee0c03faf4c (diff) | |
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>
Diffstat (limited to 'tests/manual/textrendering/codeeditor/codeeditor.cpp')
| -rw-r--r-- | tests/manual/textrendering/codeeditor/codeeditor.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/tests/manual/textrendering/codeeditor/codeeditor.cpp b/tests/manual/textrendering/codeeditor/codeeditor.cpp new file mode 100644 index 00000000000..15f84622e48 --- /dev/null +++ b/tests/manual/textrendering/codeeditor/codeeditor.cpp @@ -0,0 +1,134 @@ +// 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] + |