qt textedit и plaintextedit в чем разница

Qt plaintextedit отличие от textedit

1 ответ

Из документации Qt:

QPlainTextEdit — это расширенный просмотрщик/редактор, поддерживающий простой текст. Это оптимизирован для обработки больших документов и быстрого реагирования на пользователя вход.

QPlainText использует очень те же технологии и концепции, что и QTextEdit, но оптимизирован для обработки обычного текста.

QPlainTextEdit работает над параграфами и символами. Абзац — это форматированная строка, которая обернута словом, чтобы вписаться в ширину виджет. По умолчанию при чтении простого текста одна новая строка означает параграф. Документ состоит из нуля или более абзацев. Пункты разделяются жесткими разрывами строки. Каждый символ в абзаце имеет свои собственные атрибуты, например, шрифт и цвет.

QPlainTextEdit — это тонкий класс, реализованный с использованием большей части технологии, которая находится за QTextEdit и QTextDocument. Его производительность преимущества по сравнению с QTextEdit основываются главным образом на использовании упрощенное текстовое оформление под названием QPlainTextDocumentLayout в тексте документ (см. QTextDocument::setDocumentLayout()). Обычный текст макет документа не поддерживает таблицы и встроенные фреймы; заменяет точное вычисление высоты пикселя с помощью строки соответственно, поэтапный подход к прокрутке. Это делает это можно обрабатывать значительно большие документы и изменять размер редактор с завершением строки, включенным в режиме реального времени. Это также быстрый просмотр журнала (см. setMaximumBlockCount()).

Таким образом, разница в том, что QPlainTextEdit оптимизирован для обработки обычного текста и может использоваться даже при очень больших текстовых файлах. Также способ форматирования текста проще.

Если вы планируете поддерживать только простые тексты, то правильный выбор QPlainTextEdit.

Bakuriu 04 июль 2013, в 10:52

Ещё вопросы

The QPlainTextEdit class provides a that is used to edit and display plain text. More…

This class was duced in Qt 4.4.

Property Documentation

backgroundVisible : bool

This property holds whether the palette background is visible outside the document area

If set to true, the plain text edit paints the palette background on the viewport area not covered by the text document. Otherwise, if set to false, it won’t. The feature makes it possible for the user to visually distinguish between the area of the document, painted with the base color of the palette, and the empty area not covered by any document.

The default is false.

blockCount : const int

This property holds the number of text blocks in the document.

By default, in an empty document, this property contains a value of 1.

centerOn : bool

This property holds whether the cursor should be centered on screen

If set to true, the plain text edit s the document vertically to make the cursor visible at the center of the viewport. This also allows the text edit to below the end of the document. Otherwise, if set to false, the plain text edit s the smallest amount possible to ensure the cursor is visible. The same algorithm is applied to any new line appended through appendPlainText().

The default is false.

See also centerCursor() and ensureCursorVisible().

cursorWidth : int

This property specifies the width of the cursor in pixels. The default value is 1.

documentTitle : QString

This property holds the title of the document parsed from the text.

By default, this property contains an empty string.

lineWrapMode : LineWrapMode

This property holds the line wrap mode

The default mode is Width which causes words to be wrapped at the right edge of the text edit. Wrapping occurs at whitespace, keeping whole words intact. If you want wrapping to occur within words use setWordWrapMode().

maximumBlockCount : int

This property holds the limit for blocks in the document.

Specifies the maximum number of blocks the document may have. If there are more blocks in the document that specified with this property blocks are removed from the beginning of the document.

A negative or zero value specifies that the document may contain an unlimited amount of blocks.

The default value is 0.

Note that setting this property will apply the limit imtely to the document contents. Setting this property also disables the undo redo history.

overwriteMode : bool

This property holds whether text entered by the user will overwrite existing text

As with many text editors, the plain text editor can be configured to insert or overwrite existing text with new text entered by the user.

If this property is true, existing text is overwritten, character-for-character by new text; otherwise, text is inserted at the cursor position, displacing existing text.

By default, this property is false (new text does not overwrite existing text).

placeholderText : QString

This property holds the editor placeholder text

Setting this property makes the editor display a grayed-out placeholder text as long as the document() is empty.

By default, this property contains an empty string.

This property was duced in Qt 5.3.

plainText : QString

This property gets and sets the plain text editor’s contents. The previous contents are removed and undo/redo history is reset when this property is set. currentCharFormat() is also reset, unless textCursor() is already at the beginning of the document.

By default, for an editor with no contents, this property contains an empty string.

readOnly : bool

This property holds whether the text edit is reonly

In a reonly text edit the user can only igate through the text and select text; modifying the text is not possible.

This property’s default is false.

tabChangesFocus : bool

This property holds whether Tab changes focus or is accepted as input

In some occasions text edits should not allow the user to input tabulators or change indentation using the Tab key, as this breaks the focus chain. The default is false.

tabStopDistance : qreal

This property holds the tab stop distance in pixels

By default, this property contains a value of 80.

This property was duced in Qt 5.10.

textInteractionFlags : Qt::TextInteractionFlags

Specifies how the label should interact with user input if it displays text.

If the flags contain either Qt::sAccessibleByKeyboard or Qt::TextSelectableByKeyboard then the focus policy is also automatically set to Qt::ClickFocus.

The default value depends on whether the QPlainTextEdit is reonly or editable.

undoRedoEnabled : bool

This property holds whether undo and redo are enabled

Users are only able to undo or redo actions if this property is true, and if there is an action that can be undone (or redone).

By default, this property is true.

wordWrapMode : QTextOption::WrapMode

This property holds the mode QPlainTextEdit will use when wrapping text by words

By default, this property is set to QTextOption::WrapAtWordBoundaryOrAnywhere.

See also QTextOption::WrapMode.

Member Documentation

QPlainTextEdit::QPlainTextEdit(const QString &text, Q *parent = nullptr)

Constructs a QPlainTextEdit with parent parent. The text edit will display the plain text text.

QPlainTextEdit::QPlainTextEdit(Q *parent = nullptr)

Constructs an empty QPlainTextEdit with parent parent.

[slot] void QPlainTextEdit::appendHtml(const QString &html)

Appends a new paragraph with html to the end of the text edit.

[slot] void QPlainTextEdit::appendPlainText(const QString &text)

Appends a new paragraph with text to the end of the text edit.

See also appendHtml().

[al] void QPlainTextEdit::blockCountChanged(int newBlockCount)

This al is emitted whenever the block count changes. The new block count is passed in newBlockCount.

[slot] void QPlainTextEdit::centerCursor()

s the document in order to center the cursor vertically.

See also ensureCursorVisible() and centerOn.

[slot] void QPlainTextEdit::clear()

Deletes all the text in the text edit.

See also cut() and setPlainText().

[slot] void QPlainTextEdit::copy()

Copies any selected text to the clipboard.

See also copyAvailable().

[al] void QPlainTextEdit::copyAvailable(bool yes)

This al is emitted when text is selected or de-selected in the text edit.

When text is selected this al will be emitted with yes set to true. If no text has been selected or if the selected text is de-selected this al is emitted with yes set to false.

If yes is true then copy() can be used to copy the selection to the clipboard. If yes is false then copy() does nothing.

See also selectionChanged().

[al] void QPlainTextEdit::cursorPositionChanged()

This al is emitted whenever the position of the cursor changed.

[slot] void QPlainTextEdit::cut()

Copies the selected text to the clipboard and deletes it from the text edit.

If there is no selected text nothing happens.

See also copy() and paste().

[slot] void QPlainTextEdit::insertPlainText(const QString &text)

Convenience slot that inserts text at the current cursor position.

It is equivalent to

[al] void QPlainTextEdit::modificationChanged(bool changed)

This al is emitted whenever the content of the document changes in a way that affects the modification e. If changed is true, the document has been modified; otherwise it is false.

For example, calling setModified(false) on a document and then inserting text causes the al to get emitted. If you undo that operation, causing the document to return to its original unmodified e, the al will get emitted again.

[slot] void QPlainTextEdit::paste()

Pastes the text from the clipboard into the text edit at the current cursor position.

If there is no text in the clipboard nothing happens.

See also cut() and copy().

[slot] void QPlainTextEdit::redo()

Redoes the last operation.

If there is no operation to redo, i.e. there is no redo step in the undo/redo history, nothing happens.

[al] void QPlainTextEdit::redoAvailable(bool available)

This al is emitted whenever redo operations become available (available is true) or uailable (available is false).

[slot] void QPlainTextEdit::selectAll()

See also copy(), cut(), and textCursor().

[al] void QPlainTextEdit::selectionChanged()

This al is emitted whenever the selection changes.

See also copyAvailable().

[slot] void QPlainTextEdit::setPlainText(const QString &text)

Changes the text of the text edit to the string text. Any previous text is removed.

text is interpreted as plain text.

Note: Setter for property plainText.

See also toPlainText().

[al] void QPlainTextEdit::textChanged()

This al is emitted whenever the document’s content changes; for example, when text is inserted or deleted, or when formatting is applied.

Note: Notifier al for property plainText.

[slot] void QPlainTextEdit::undo()

Undoes the last operation.

If there is no operation to undo, i.e. there is no undo step in the undo/redo history, nothing happens.

[al] void QPlainTextEdit::undoAvailable(bool available)

This al is emitted whenever undo operations become available (available is true) or uailable (available is false).

[al] void QPlainTextEdit::upRequest(const QRect &rect, int dy)

This al is emitted when the text document needs an up of the specified rect. If the text is ed, rect will cover the entire viewport area. If the text is ed vertically, dy carries the amount of pixels the viewport was ed.

The purpose of the al is to support s in plain text edit subclasses that e.g. show line numbers, breakpoints, or other rmation.

[slot] void QPlainTextEdit::zoomIn(int range = 1)

Zooms in on the text by making the base font size range points larger and recalculating all font sizes to be the new size. This does not change the size of any images.

[slot] void QPlainTextEdit::zoomOut(int range = 1)

Zooms out on the text by making the base font size range points smaller and recalculating all font sizes to be the new size. This does not change the size of any images.

[virtual] QPlainTextEdit::

QString QPlainTextEdit::anchorAt(const QPoint &pos) const

Returns the reference of the anchor at position pos, or an empty string if no anchor exists at that point.

This was duced in Qt 4.7.

[protected] QRectF QPlainTextEdit::blockBoundingGeometry(const QTextBlock &block) const

Returns the bounding rectangle of the text block in content coordinates. Translate the rectangle with the contentOffset() to get visual coordinates on the viewport.

See also firstVisibleBlock() and blockBoundingRect().

[protected] QRectF QPlainTextEdit::blockBoundingRect(const QTextBlock &block) const

Returns the bounding rectangle of the text block in the block’s own coordinates.

See also blockBoundingGeometry().

[virtual protected] bool QPlainTextEdit::canInsertFromMimeData(const QMimeData *source) const

This returns true if the contents of the MIME data object, specified by source, can be decoded and inserted into the document. It is called for example when during a drag operation the mouse enters this and it is necessary to determine whether it is possible to accept the drag.

bool QPlainTextEdit::canPaste() const

Returns whether text can be pasted from the clipboard into the textedit.

[override virtual protected] void QPlainTextEdit::changeEvent(QEvent *e)

Reimplements: QFrame::changeEvent(QEvent *ev).

[protected] QPointF QPlainTextEdit::contentOffset() const

Returns the content’s origin in viewport coordinates.

The origin of the content of a plain text edit is always the top left corner of the first visible text block. The content offset is different from (0,0) when the text has been ed horizontally, or when the first visible block has been ed partially off the screen, i.e. the visible text does not start with the first line of the first visible block, or when the first visible block is the very first block and the editor displays a margin.

See also firstVisibleBlock(), horizontalBar(), and verticalBar().

Reimplements: QAbstractArea::contextEvent(QContextEvent *e).

Shows the standard context created with createStandardContext().

rmation the event is passed in the event object.

[virtual protected] QMimeData *QPlainTextEdit::createMimeDataFromSelection() const

This returns a new MIME data object to represent the contents of the text edit’s current selection. It is called when the selection needs to be encapsulated into a new QMimeData object; for example, when a drag and drop operation is started, or when data is copied to the clipboard.

Q *QPlainTextEdit::createStandardContext()

This creates the standard context which is shown when the user clicks on the text edit with the right mouse button. It is called from the default contextEvent() handler. The ‘s ownership is transferred to the caller.

We that you use the createStandardContext(QPoint) version instead which will enable the actions that are sensitive to where the user clicked.

Q *QPlainTextEdit::createStandardContext(const QPoint &position)

This creates the standard context which is shown when the user clicks on the text edit with the right mouse button. It is called from the default contextEvent() handler and it takes the position in document coordinates where the mouse click was. This can enable actions that are sensitive to the position where the user clicked. The ‘s ownership is transferred to the caller.

This was duced in Qt 5.5.

QTextCharFormat QPlainTextEdit::currentCharFormat() const

Returns the char format that is used when inserting new text.

See also setCurrentCharFormat().

QTextCursor QPlainTextEdit::cursorForPosition(const QPoint &pos) const

returns a QTextCursor at position pos (in viewport coordinates).

QRect QPlainTextEdit::cursorRect(const QTextCursor &cursor) const

returns a rectangle (in viewport coordinates) that includes the cursor.

QRect QPlainTextEdit::cursorRect() const

returns a rectangle (in viewport coordinates) that includes the cursor of the text edit.

QTextDocument *QPlainTextEdit::document() const

Returns a pointer to the underlying document.

See also setDocument().

[override virtual protected] void QPlainTextEdit::dragEnterEvent(QDragEnterEvent *e)

Reimplements: QAbstractArea::dragEnterEvent(QDragEnterEvent *event).

[override virtual protected] void QPlainTextEdit::dragLeaveEvent(QDragLeaveEvent *e)

Reimplements: QAbstractArea::dragLeaveEvent(QDragLeaveEvent *event).

[override virtual protected] void QPlainTextEdit::dragMoveEvent(QDragMoveEvent *e)

Reimplements: QAbstractArea::dragMoveEvent(QDragMoveEvent *event).

[override virtual protected] void QPlainTextEdit::dropEvent(QDropEvent *e)

Reimplements: QAbstractArea::dropEvent(QDropEvent *event).

void QPlainTextEdit::ensureCursorVisible()

Ensures that the cursor is visible by ing the text edit if necessary.

See also centerCursor() and centerOn.

Returns previously set selections.

See also setSelections().

bool QPlainTextEdit::find(const QString &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags())

Finds the next occurrence of the string, exp, using the given options. Returns true if exp was found and changes the cursor to select the match; otherwise returns false.

bool QPlainTextEdit::find(const QRegExp &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags())

Finds the next occurrence, matching the regular expression, exp, using the given options. The QTextDocument::FindCaseSensitively option is d for this overload, use QRegExp::caseSensitivity instead.

Returns true if a match was found and changes the cursor to select the match; otherwise returns false.

This was duced in Qt 5.3.

bool QPlainTextEdit::find(const QRegularExpression &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags())

Finds the next occurrence, matching the regular expression, exp, using the given options. The QTextDocument::FindCaseSensitively option is d for this overload, use QRegularExpression::CaseInsensitiveOption instead.

Returns true if a match was found and changes the cursor to select the match; otherwise returns false.

This was duced in Qt 5.13.

[protected] QTextBlock QPlainTextEdit::firstVisibleBlock() const

Returns the first visible block.

See also blockBoundingRect().

[override virtual protected] void QPlainTextEdit::focusInEvent(QFocusEvent *e)

Reimplements: Q::focusInEvent(QFocusEvent *event).

[override virtual protected] bool QPlainTextEdit::focusNextPrevChild(bool next)

Reimplements: Q::focusNextPrevChild(bool next).

[override virtual protected] void QPlainTextEdit::focusOutEvent(QFocusEvent *e)

Reimplements: Q::focusOutEvent(QFocusEvent *event).

[protected] QAbstractTextDocumentLayout::PaintContext QPlainTextEdit::getPaintContext() const

Returns the paint context for the viewport(), useful only when reimplementing paintEvent().

[override virtual protected] void QPlainTextEdit::inputMethodEvent(QInputMethodEvent *e)

Reimplements: Q::inputMethodEvent(QInputMethodEvent *event).

[override virtual] QVariant QPlainTextEdit::inputMethodQuery(Qt::InputMethodQuery property) const

Reimplements: Q::inputMethodQuery(Qt::InputMethodQuery query) const.

[virtual protected] void QPlainTextEdit::insertFromMimeData(const QMimeData *source)

This inserts the contents of the MIME data object, specified by source, into the text edit at the current cursor position. It is called whenever text is inserted as the result of a clipboard paste operation, or when the text edit accepts data from a drag and drop operation.

[override virtual protected] void QPlainTextEdit::keyPressEvent(QKeyEvent *e)

Reimplements: QAbstractArea::keyPressEvent(QKeyEvent *e).

[override virtual protected] void QPlainTextEdit::keyReleaseEvent(QKeyEvent *e)

Reimplements: Q::keyReleaseEvent(QKeyEvent *event).

[virtual] QVariant QPlainTextEdit::loadResource(int type, const QUrl &name)

Loads the resource specified by the given type and name.

This is an extension of QTextDocument::loadResource().

See also QTextDocument::loadResource().

void QPlainTextEdit::mergeCurrentCharFormat(const QTextCharFormat &modifier)

Merges the properties specified in modifier into the current character format by calling QTextCursor::mergeCharFormat on the editor’s cursor. If the editor has a selection then the properties of modifier are directly applied to the selection.

See also QTextCursor::mergeCharFormat().

[override virtual protected] void QPlainTextEdit::mouseDoubleClickEvent(QMouseEvent *e)

Reimplements: QAbstractArea::mouseDoubleClickEvent(QMouseEvent *e).

[override virtual protected] void QPlainTextEdit::mouseMoveEvent(QMouseEvent *e)

Reimplements: QAbstractArea::mouseMoveEvent(QMouseEvent *e).

[override virtual protected] void QPlainTextEdit::mousePressEvent(QMouseEvent *e)

Reimplements: QAbstractArea::mousePressEvent(QMouseEvent *e).

[override virtual protected] void QPlainTextEdit::mouseReleaseEvent(QMouseEvent *e)

Reimplements: QAbstractArea::mouseReleaseEvent(QMouseEvent *e).

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

Moves the cursor by performing the given operation.

If mode is QTextCursor::KeepAnchor, the cursor selects the text it moves over. This is the same effect that the user achieves when they hold down the Shift key and move the cursor with the cursor keys.

See also QTextCursor::movePosition().

[override virtual protected] void QPlainTextEdit::paintEvent(QPaintEvent *e)

Reimplements: QAbstractArea::paintEvent(QPaintEvent *event).

void QPlainTextEdit::(QPagedPaintDevice *er) const

Convenience to the text edit’s document to the given er. This is equivalent to calling the method on the document directly except that this also supports QPrinter::Selection as range.

See also QTextDocument::().

[override virtual protected] void QPlainTextEdit::resizeEvent(QResizeEvent *e)

Reimplements: QAbstractArea::resizeEvent(QResizeEvent *event).

[override virtual protected] void QPlainTextEdit::ContentsBy(int dx, int dy)

Reimplements: QAbstractArea::ContentsBy(int dx, int dy).

void QPlainTextEdit::setCurrentCharFormat(const QTextCharFormat &format)

Sets the char format that is be used when inserting new text to format by calling QTextCursor::setCharFormat() on the editor’s cursor. If the editor has a selection then the char format is directly applied to the selection.

See also currentCharFormat().

void QPlainTextEdit::setDocument(QTextDocument *document)

Makes document the new document of the text editor.

The parent QObject of the provided document remains the owner of the object. If the current document is a child of the text editor, then it is deleted.

The document must have a document layout that inherits QPlainTextDocumentLayout (see QTextDocument::setDocumentLayout()).

This allows temporarily marking certain regions in the document with a given color, specified as selections. This can be useful for example in a programming editor to mark a whole line of text with a given background color to indicate the existence of a breakpoint.

See also QTextEdit::Selection and Selections().

void QPlainTextEdit::setTextCursor(const QTextCursor &cursor)

Sets the visible cursor.

See also textCursor().

[override virtual protected] void QPlainTextEdit::showEvent(QShowEvent *)

Reimplements: Q::showEvent(QShowEvent *event).

QTextCursor QPlainTextEdit::textCursor() const

Returns a copy of the QTextCursor that represents the currently visible cursor. Note that changes on the returned cursor do not affect QPlainTextEdit’s cursor; use setTextCursor() to up the visible cursor.

See also setTextCursor().

QString QPlainTextEdit::toPlainText() const

Returns the text of the text edit as plain text.

Note: Getter for property plainText.

See also QPlainTextEdit::setPlainText().

[override virtual protected] void QPlainTextEdit::wheelEvent(QWheelEvent *e)

Reimplements: QAbstractArea::wheelEvent(QWheelEvent *e).

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