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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qlist.h>
#include <QtCore/qvarlengtharray.h>
#include <QtGui/qcolor.h>
#include <QtGui/qglyphrun.h>
#include <QtGui/qimage.h>
#include <QtGui/qtextdocument.h>
#include <QtGui/qtextlayout.h>
#include "qquickclipnode_p.h"
#include "qquicktextnode_p.h"
#ifndef QQUICKTEXTNODEENGINE_P_H
#define QQUICKTEXTNODEENGINE_P_H
QT_BEGIN_NAMESPACE
// Engine that takes glyph runs as input, and produces a set of glyph nodes, clip nodes,
// and rectangle nodes to represent the text, decorations and selection. Will try to minimize
// number of nodes, and join decorations in neighbouring items
class QQuickTextNodeEngine {
public:
enum SelectionState {
Unselected,
Selected
};
struct BinaryTreeNode {
BinaryTreeNode()
: selectionState(Unselected), clipNode(0), decorations(QQuickTextNode::NoDecoration)
, ascent(0.0), leftChildIndex(-1), rightChildIndex(-1)
{
}
BinaryTreeNode(const QRectF &brect, const QImage &i, SelectionState selState, qreal a)
: boundingRect(brect), selectionState(selState), clipNode(0), decorations(QQuickTextNode::NoDecoration)
, image(i), ascent(a), leftChildIndex(-1), rightChildIndex(-1)
{
}
BinaryTreeNode(const QGlyphRun &g, SelectionState selState, const QRectF &brect,
const QQuickTextNode::Decorations &decs, const QColor &c, const QColor &bc,
const QPointF &pos, qreal a)
: glyphRun(g), boundingRect(brect), selectionState(selState), clipNode(0), decorations(decs)
, color(c), backgroundColor(bc), position(pos), ascent(a), leftChildIndex(-1), rightChildIndex(-1)
{
}
QGlyphRun glyphRun;
QRectF boundingRect;
SelectionState selectionState;
QQuickDefaultClipNode *clipNode;
QQuickTextNode::Decorations decorations;
QColor color;
QColor backgroundColor;
QPointF position;
QImage image;
qreal ascent;
int leftChildIndex;
int rightChildIndex;
static void insert(QVarLengthArray<BinaryTreeNode, 16> *binaryTree, const QRectF &rect, const QImage &image, qreal ascent, SelectionState selectionState)
{ insert(binaryTree, BinaryTreeNode(rect, image, selectionState, ascent)); }
static void insert(QVarLengthArray<BinaryTreeNode, 16> *binaryTree, const QGlyphRun &glyphRun, SelectionState selectionState,
QQuickTextNode::Decorations decorations, const QColor &textColor, const QColor &backgroundColor, const QPointF &position);
static void insert(QVarLengthArray<BinaryTreeNode, 16> *binaryTree, const BinaryTreeNode &binaryTreeNode);
static void inOrder(const QVarLengthArray<BinaryTreeNode, 16> &binaryTree, QVarLengthArray<int> *sortedIndexes, int currentIndex = 0);
};
QQuickTextNodeEngine() : m_hasSelection(false), m_hasContents(false) {}
bool hasContents() const { return m_hasContents; }
void addTextBlock(QTextDocument *, const QTextBlock &, const QPointF &position, const QColor &textColor, const QColor& anchorColor, int selectionStart, int selectionEnd);
QTextLine currentLine() const { return m_currentLine; }
void setCurrentLine(const QTextLine ¤tLine)
{
if (m_currentLine.isValid())
processCurrentLine();
m_currentLine = currentLine;
}
void addBorder(const QRectF &rect, qreal border, QTextFrameFormat::BorderStyle borderStyle,
const QBrush &borderBrush);
void addFrameDecorations(QTextDocument *document, QTextFrame *frame);
void addImage(const QRectF &rect, const QImage &image, qreal ascent,
SelectionState selectionState,
QTextFrameFormat::Position layoutPosition);
int addText(const QTextBlock &block,
const QTextCharFormat &charFormat,
const QColor &textColor,
const QVarLengthArray<QTextLayout::FormatRange> &colorChanges,
int textPos, int fragmentEnd,
int selectionStart, int selectionEnd);
void addTextObject(const QPointF &position, const QTextCharFormat &format,
SelectionState selectionState,
QTextDocument *textDocument, int pos,
QTextFrameFormat::Position layoutPosition = QTextFrameFormat::InFlow);
void addSelectedGlyphs(const QGlyphRun &glyphRun);
void addUnselectedGlyphs(const QGlyphRun &glyphRun);
void addGlyphsInRange(int rangeStart, int rangeEnd,
const QColor &color, const QColor &backgroundColor,
int selectionStart, int selectionEnd);
void addGlyphsForRanges(const QVarLengthArray<QTextLayout::FormatRange> &ranges,
int start, int end,
int selectionStart, int selectionEnd);
void addToSceneGraph(QQuickTextNode *parent,
QQuickText::TextStyle style = QQuickText::Normal,
const QColor &styleColor = QColor());
void setSelectionColor(const QColor &selectionColor)
{
m_selectionColor = selectionColor;
}
void setSelectedTextColor(const QColor &selectedTextColor)
{
m_selectedTextColor = selectedTextColor;
}
void setTextColor(const QColor &textColor)
{
m_textColor = textColor;
}
void setAnchorColor(const QColor &anchorColor)
{
m_anchorColor = anchorColor;
}
void setPosition(const QPointF &position)
{
m_position = position;
}
private:
struct TextDecoration
{
TextDecoration() : selectionState(Unselected) {}
TextDecoration(const SelectionState &s,
const QRectF &r,
const QColor &c)
: selectionState(s)
, rect(r)
, color(c)
{
}
SelectionState selectionState;
QRectF rect;
QColor color;
};
void processCurrentLine();
void addTextDecorations(const QVarLengthArray<TextDecoration> &textDecorations, qreal offset, qreal thickness);
void mergeFormats(QTextLayout *textLayout, QVarLengthArray<QTextLayout::FormatRange> *mergedFormats);
QColor m_selectionColor;
QColor m_textColor;
QColor m_backgroundColor;
QColor m_selectedTextColor;
QColor m_anchorColor;
QPointF m_position;
QTextLine m_currentLine;
QList<QPair<QRectF, QColor> > m_backgrounds;
QList<QRectF> m_selectionRects;
QVarLengthArray<BinaryTreeNode, 16> m_currentLineTree;
QList<TextDecoration> m_lines;
QVector<BinaryTreeNode> m_processedNodes;
QList<QPair<QRectF, QImage> > m_images;
bool m_hasSelection : 1;
bool m_hasContents : 1;
friend class QQuickTextNode;
};
QT_END_NAMESPACE
#endif // QQUICKTEXTNODEENGINE_P_H
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