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| 1 | +/**************************************************************************** |
| 2 | +** |
| 3 | +** Copyright (C) 2016 The Qt Company Ltd. |
| 4 | +** Contact: https://www.qt.io/licensing/ |
| 5 | +** |
| 6 | +** This file is part of the examples of the Qt Toolkit. |
| 7 | +** |
| 8 | +** $QT_BEGIN_LICENSE:BSD$ |
| 9 | +** Commercial License Usage |
| 10 | +** Licensees holding valid commercial Qt licenses may use this file in |
| 11 | +** accordance with the commercial license agreement provided with the |
| 12 | +** Software or, alternatively, in accordance with the terms contained in |
| 13 | +** a written agreement between you and The Qt Company. For licensing terms |
| 14 | +** and conditions see https://www.qt.io/terms-conditions. For further |
| 15 | +** information use the contact form at https://www.qt.io/contact-us. |
| 16 | +** |
| 17 | +** BSD License Usage |
| 18 | +** Alternatively, you may use this file under the terms of the BSD license |
| 19 | +** as follows: |
| 20 | +** |
| 21 | +** "Redistribution and use in source and binary forms, with or without |
| 22 | +** modification, are permitted provided that the following conditions are |
| 23 | +** met: |
| 24 | +** * Redistributions of source code must retain the above copyright |
| 25 | +** notice, this list of conditions and the following disclaimer. |
| 26 | +** * Redistributions in binary form must reproduce the above copyright |
| 27 | +** notice, this list of conditions and the following disclaimer in |
| 28 | +** the documentation and/or other materials provided with the |
| 29 | +** distribution. |
| 30 | +** * Neither the name of The Qt Company Ltd nor the names of its |
| 31 | +** contributors may be used to endorse or promote products derived |
| 32 | +** from this software without specific prior written permission. |
| 33 | +** |
| 34 | +** |
| 35 | +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 36 | +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 37 | +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 38 | +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 39 | +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 40 | +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 41 | +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 42 | +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 43 | +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 44 | +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 45 | +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| 46 | +** |
| 47 | +** $QT_END_LICENSE$ |
| 48 | +** |
| 49 | +****************************************************************************/ |
| 50 | + |
| 51 | +#include <QtWidgets> |
| 52 | +#include "codeeditor.h" |
| 53 | + |
| 54 | +CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent) |
| 55 | +{ |
| 56 | + lineNumberArea = new LineNumberArea(this); |
| 57 | + |
| 58 | + connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth); |
| 59 | + connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea); |
| 60 | + connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine); |
| 61 | + |
| 62 | + updateLineNumberAreaWidth(0); |
| 63 | +} |
| 64 | + |
| 65 | +int CodeEditor::lineNumberAreaWidth() |
| 66 | +{ |
| 67 | + int digits = 1; |
| 68 | + int max = qMax(1, blockCount()); |
| 69 | + |
| 70 | + while (max >= 10) |
| 71 | + { |
| 72 | + max /= 10; |
| 73 | + ++digits; |
| 74 | + } |
| 75 | + |
| 76 | + int space = 10 + fontMetrics().horizontalAdvance(" ") * digits; |
| 77 | + |
| 78 | + return space; |
| 79 | +} |
| 80 | + |
| 81 | +void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */) |
| 82 | +{ |
| 83 | + setViewportMargins(lineNumberAreaWidth(), 0, 0, 0); |
| 84 | +} |
| 85 | + |
| 86 | +void CodeEditor::updateLineNumberArea(const QRect &rect, int dy) |
| 87 | +{ |
| 88 | + if (dy) |
| 89 | + lineNumberArea->scroll(0, dy); |
| 90 | + else |
| 91 | + lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height()); |
| 92 | + |
| 93 | + if (rect.contains(viewport()->rect())) |
| 94 | + updateLineNumberAreaWidth(0); |
| 95 | +} |
| 96 | + |
| 97 | +void CodeEditor::resizeEvent(QResizeEvent *e) |
| 98 | +{ |
| 99 | + QPlainTextEdit::resizeEvent(e); |
| 100 | + |
| 101 | + QRect cr = contentsRect(); |
| 102 | + lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height())); |
| 103 | +} |
| 104 | + |
| 105 | +void CodeEditor::highlightCurrentLine() |
| 106 | +{ |
| 107 | + QList<QTextEdit::ExtraSelection> extraSelections; |
| 108 | + QTextEdit::ExtraSelection selection; |
| 109 | + QColor lineColor = QColor(Qt::yellow).lighter(160); |
| 110 | + |
| 111 | + selection.format.setBackground(lineColor); |
| 112 | + selection.format.setProperty(QTextFormat::FullWidthSelection, true); |
| 113 | + selection.cursor = textCursor(); |
| 114 | + selection.cursor.clearSelection(); |
| 115 | + extraSelections.append(selection); |
| 116 | + |
| 117 | + setExtraSelections(extraSelections); |
| 118 | + |
| 119 | + selection.cursor.clearSelection(); |
| 120 | + |
| 121 | +} |
| 122 | + |
| 123 | +void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event) |
| 124 | +{ |
| 125 | + QPainter painter(lineNumberArea); |
| 126 | + painter.fillRect(event->rect(), Qt::lightGray); |
| 127 | + |
| 128 | + QTextBlock block = firstVisibleBlock(); |
| 129 | + int blockNumber = block.blockNumber(); |
| 130 | + int top = (int)blockBoundingGeometry(block).translated(contentOffset()).top(); |
| 131 | + int bottom = top + (int)blockBoundingRect(block).height(); |
| 132 | + |
| 133 | + while (block.isValid() && top <= event->rect().bottom()) |
| 134 | + { |
| 135 | + if (block.isVisible() && bottom >= event->rect().top()) |
| 136 | + { |
| 137 | + QString number = QString::number(blockNumber + 1); |
| 138 | + painter.setPen(Qt::black); |
| 139 | + painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(), Qt::AlignLeft, number); |
| 140 | + } |
| 141 | + |
| 142 | + block = block.next(); |
| 143 | + top = bottom; |
| 144 | + bottom = top + (int)blockBoundingRect(block).height(); |
| 145 | + ++blockNumber; |
| 146 | + } |
| 147 | +} |
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