Current File : //usr/include/qt5/QtWidgets/qtextedit.h

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**
** Copyright (C) 2016 The Qt Company Ltd.
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**
** This file is part of the QtWidgets module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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#ifndef QTEXTEDIT_H
#define QTEXTEDIT_H

#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/qabstractscrollarea.h>
#include <QtGui/qtextdocument.h>
#include <QtGui/qtextoption.h>
#include <QtGui/qtextcursor.h>
#include <QtGui/qtextformat.h>

QT_REQUIRE_CONFIG(textedit);

QT_BEGIN_NAMESPACE

class QStyleSheet;
class QTextDocument;
class QMenu;
class QTextEditPrivate;
class QMimeData;
class QPagedPaintDevice;

class Q_WIDGETS_EXPORT QTextEdit : public QAbstractScrollArea
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QTextEdit)
    Q_PROPERTY(AutoFormatting autoFormatting READ autoFormatting WRITE setAutoFormatting)
    Q_PROPERTY(bool tabChangesFocus READ tabChangesFocus WRITE setTabChangesFocus)
    Q_PROPERTY(QString documentTitle READ documentTitle WRITE setDocumentTitle)
    Q_PROPERTY(bool undoRedoEnabled READ isUndoRedoEnabled WRITE setUndoRedoEnabled)
    Q_PROPERTY(LineWrapMode lineWrapMode READ lineWrapMode WRITE setLineWrapMode)
    QDOC_PROPERTY(QTextOption::WrapMode wordWrapMode READ wordWrapMode WRITE setWordWrapMode)
    Q_PROPERTY(int lineWrapColumnOrWidth READ lineWrapColumnOrWidth WRITE setLineWrapColumnOrWidth)
    Q_PROPERTY(bool readOnly READ isReadOnly WRITE setReadOnly)
#ifndef QT_NO_TEXTHTMLPARSER
    Q_PROPERTY(QString html READ toHtml WRITE setHtml NOTIFY textChanged USER true)
#endif
    Q_PROPERTY(QString plainText READ toPlainText WRITE setPlainText DESIGNABLE false)
    Q_PROPERTY(bool overwriteMode READ overwriteMode WRITE setOverwriteMode)
    Q_PROPERTY(int tabStopWidth READ tabStopWidth WRITE setTabStopWidth)
    Q_PROPERTY(bool acceptRichText READ acceptRichText WRITE setAcceptRichText)
    Q_PROPERTY(int cursorWidth READ cursorWidth WRITE setCursorWidth)
    Q_PROPERTY(Qt::TextInteractionFlags textInteractionFlags READ textInteractionFlags WRITE setTextInteractionFlags)
    Q_PROPERTY(QTextDocument *document READ document WRITE setDocument DESIGNABLE false)
    Q_PROPERTY(QString placeholderText READ placeholderText WRITE setPlaceholderText)
public:
    enum LineWrapMode {
        NoWrap,
        WidgetWidth,
        FixedPixelWidth,
        FixedColumnWidth
    };
    Q_ENUM(LineWrapMode)

    enum AutoFormattingFlag {
        AutoNone = 0,
        AutoBulletList = 0x00000001,
        AutoAll = 0xffffffff
    };

    Q_DECLARE_FLAGS(AutoFormatting, AutoFormattingFlag)
    Q_FLAG(AutoFormatting)

    explicit QTextEdit(QWidget *parent = Q_NULLPTR);
    explicit QTextEdit(const QString &text, QWidget *parent = Q_NULLPTR);
    virtual ~QTextEdit();

    void setDocument(QTextDocument *document);
    QTextDocument *document() const;

    void setPlaceholderText(const QString &placeholderText);
    QString placeholderText() const;

    void setTextCursor(const QTextCursor &cursor);
    QTextCursor textCursor() const;

    bool isReadOnly() const;
    void setReadOnly(bool ro);

    void setTextInteractionFlags(Qt::TextInteractionFlags flags);
    Qt::TextInteractionFlags textInteractionFlags() const;

    qreal fontPointSize() const;
    QString fontFamily() const;
    int fontWeight() const;
    bool fontUnderline() const;
    bool fontItalic() const;
    QColor textColor() const;
    QColor textBackgroundColor() const;
    QFont currentFont() const;
    Qt::Alignment alignment() const;

    void mergeCurrentCharFormat(const QTextCharFormat &modifier);

    void setCurrentCharFormat(const QTextCharFormat &format);
    QTextCharFormat currentCharFormat() const;

    AutoFormatting autoFormatting() const;
    void setAutoFormatting(AutoFormatting features);

    bool tabChangesFocus() const;
    void setTabChangesFocus(bool b);

    inline void setDocumentTitle(const QString &title)
    { document()->setMetaInformation(QTextDocument::DocumentTitle, title); }
    inline QString documentTitle() const
    { return document()->metaInformation(QTextDocument::DocumentTitle); }

    inline bool isUndoRedoEnabled() const
    { return document()->isUndoRedoEnabled(); }
    inline void setUndoRedoEnabled(bool enable)
    { document()->setUndoRedoEnabled(enable); }

    LineWrapMode lineWrapMode() const;
    void setLineWrapMode(LineWrapMode mode);

    int lineWrapColumnOrWidth() const;
    void setLineWrapColumnOrWidth(int w);

    QTextOption::WrapMode wordWrapMode() const;
    void setWordWrapMode(QTextOption::WrapMode policy);

    bool find(const QString &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags());
#ifndef QT_NO_REGEXP
    bool find(const QRegExp &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags());
#endif

    QString toPlainText() const;
#ifndef QT_NO_TEXTHTMLPARSER
    QString toHtml() const;
#endif

    void ensureCursorVisible();

    Q_INVOKABLE virtual QVariant loadResource(int type, const QUrl &name);
#ifndef QT_NO_CONTEXTMENU
    QMenu *createStandardContextMenu();
    QMenu *createStandardContextMenu(const QPoint &position);
#endif

    QTextCursor cursorForPosition(const QPoint &pos) const;
    QRect cursorRect(const QTextCursor &cursor) const;
    QRect cursorRect() const;

    QString anchorAt(const QPoint& pos) const;

    bool overwriteMode() const;
    void setOverwriteMode(bool overwrite);

    int tabStopWidth() const;
    void setTabStopWidth(int width);

    int cursorWidth() const;
    void setCursorWidth(int width);

    bool acceptRichText() const;
    void setAcceptRichText(bool accept);

    struct ExtraSelection
    {
        QTextCursor cursor;
        QTextCharFormat format;
    };
    void setExtraSelections(const QList<ExtraSelection> &selections);
    QList<ExtraSelection> extraSelections() const;

    void moveCursor(QTextCursor::MoveOperation operation, QTextCursor::MoveMode mode = QTextCursor::MoveAnchor);

    bool canPaste() const;

    void print(QPagedPaintDevice *printer) const;

    QVariant inputMethodQuery(Qt::InputMethodQuery property) const Q_DECL_OVERRIDE;
    Q_INVOKABLE QVariant inputMethodQuery(Qt::InputMethodQuery query, QVariant argument) const;

public Q_SLOTS:
    void setFontPointSize(qreal s);
    void setFontFamily(const QString &fontFamily);
    void setFontWeight(int w);
    void setFontUnderline(bool b);
    void setFontItalic(bool b);
    void setTextColor(const QColor &c);
    void setTextBackgroundColor(const QColor &c);
    void setCurrentFont(const QFont &f);
    void setAlignment(Qt::Alignment a);

    void setPlainText(const QString &text);
#ifndef QT_NO_TEXTHTMLPARSER
    void setHtml(const QString &text);
#endif
    void setText(const QString &text);

#ifndef QT_NO_CLIPBOARD
    void cut();
    void copy();
    void paste();
#endif

    void undo();
    void redo();

    void clear();
    void selectAll();

    void insertPlainText(const QString &text);
#ifndef QT_NO_TEXTHTMLPARSER
    void insertHtml(const QString &text);
#endif // QT_NO_TEXTHTMLPARSER

    void append(const QString &text);

    void scrollToAnchor(const QString &name);

    void zoomIn(int range = 1);
    void zoomOut(int range = 1);

Q_SIGNALS:
    void textChanged();
    void undoAvailable(bool b);
    void redoAvailable(bool b);
    void currentCharFormatChanged(const QTextCharFormat &format);
    void copyAvailable(bool b);
    void selectionChanged();
    void cursorPositionChanged();

protected:
    virtual bool event(QEvent *e) Q_DECL_OVERRIDE;
    virtual void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
    virtual void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
    virtual void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
    virtual void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
    virtual void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
    virtual void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    virtual void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    virtual void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    virtual void mouseDoubleClickEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    virtual bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
#ifndef QT_NO_CONTEXTMENU
    virtual void contextMenuEvent(QContextMenuEvent *e) Q_DECL_OVERRIDE;
#endif
#ifndef QT_NO_DRAGANDDROP
    virtual void dragEnterEvent(QDragEnterEvent *e) Q_DECL_OVERRIDE;
    virtual void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
    virtual void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
    virtual void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
#endif
    virtual void focusInEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
    virtual void focusOutEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
    virtual void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
    virtual void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
#if QT_CONFIG(wheelevent)
    virtual void wheelEvent(QWheelEvent *e) Q_DECL_OVERRIDE;
#endif

    virtual QMimeData *createMimeDataFromSelection() const;
    virtual bool canInsertFromMimeData(const QMimeData *source) const;
    virtual void insertFromMimeData(const QMimeData *source);

    virtual void inputMethodEvent(QInputMethodEvent *) Q_DECL_OVERRIDE;

    QTextEdit(QTextEditPrivate &dd, QWidget *parent);

    virtual void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
    virtual void doSetTextCursor(const QTextCursor &cursor);

    void zoomInF(float range);

private:
    Q_DISABLE_COPY(QTextEdit)
    Q_PRIVATE_SLOT(d_func(), void _q_repaintContents(const QRectF &r))
    Q_PRIVATE_SLOT(d_func(), void _q_currentCharFormatChanged(const QTextCharFormat &))
    Q_PRIVATE_SLOT(d_func(), void _q_adjustScrollbars())
    Q_PRIVATE_SLOT(d_func(), void _q_ensureVisible(const QRectF &))
    Q_PRIVATE_SLOT(d_func(), void _q_cursorPositionChanged())
    friend class QTextEditControl;
    friend class QTextDocument;
    friend class QWidgetTextControl;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QTextEdit::AutoFormatting)

QT_END_NAMESPACE

#endif // QTEXTEDIT_H