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97 lines
4.1 KiB
Markdown
97 lines
4.1 KiB
Markdown
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# QTextEdit
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The QTextEdit widget is an advanced editor that supports formatted rich text.
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It can be used to display HTML and other rich document formats. Internally,
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QTextEdit uses the QTextDocument class to describe both the high-level
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structure of each document and the low-level formatting of paragraphs.
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If you are viewing this document in the textedit example, you can edit this
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document to explore Qt's rich text editing features. We have included some
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comments in each of the following sections to encourage you to experiment.
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## Font and Paragraph Styles
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QTextEdit supports **bold**, *italic*, _underline_ and ~~strikethrough~~ font
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styles, and can display multicolored text. Font families such as Times New
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Roman and `Courier` can also be used directly. *If you place the cursor in a
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region of styled text, the controls in the tool bars will change to reflect the
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current style.*
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Paragraphs can be formatted so that the text is left-aligned, right-aligned,
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centered, or fully justified.
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*Try changing the alignment of some text and resize the editor to see how the
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text layout changes.*
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## Lists
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Different kinds of lists can be included in rich text documents. Standard
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bullet lists can be nested, using different symbols for each level of the list:
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- Disc symbols are typically used for top-level list items.
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* Circle symbols can be used to distinguish between items in lower-level
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lists.
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+ Square symbols provide a reasonable alternative to discs and circles.
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Ordered lists can be created that can be used for tables of contents. Different
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characters can be used to enumerate items, and we can use both Roman and Arabic
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numerals in the same list structure:
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1. Introduction
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2. Qt Tools
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1) Qt Assistant
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2) Qt Designer
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1. Form Editor
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2. Component Architecture
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3) Qt Linguist
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The list will automatically be renumbered if you add or remove items. *Try
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adding new sections to the above list or removing existing item to see the
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numbers change.*
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## Images
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Inline images are treated like ordinary ranges of characters in the text
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editor, so they flow with the surrounding text. Images can also be selected in
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the same way as text, making it easy to cut, copy, and paste them.
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 *Try to select this image by clicking and dragging
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over it with the mouse, or use the text cursor to select it by holding down
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Shift and using the arrow keys. You can then cut or copy it, and paste it into
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different parts of this document.*
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## Tables
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QTextEdit can arrange and format tables, supporting features such as row and
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column spans, text formatting within cells, and size constraints for columns.
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| |Development Tools |Programming Techniques |Graphical User Interfaces|
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|-------------|------------------------------------|---------------------------|-------------------------|
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|9:00 - 11:00 |Introduction to Qt |||
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|11:00 - 13:00|Using qmake |Object-oriented Programming|Layouts in Qt |
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|13:00 - 15:00|Qt Designer Tutorial |Extreme Programming |Writing Custom Styles |
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|15:00 - 17:00|Qt Linguist and Internationalization|Test-Driven Development | |
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*Try adding text to the cells in the table and experiment with the alignment of
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the paragraphs.*
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## Hyperlinks
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QTextEdit is designed to support hyperlinks between documents, and this feature
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is used extensively in
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[Qt Assistant](http://doc.qt.io/qt-5/qtassistant-index.html). Hyperlinks are
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automatically created when an HTML file is imported into an editor. Since the
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rich text framework supports hyperlinks natively, they can also be created
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programmatically.
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## Undo and Redo
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Full support for undo and redo operations is built into QTextEdit and the
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underlying rich text framework. Operations on a document can be packaged
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together to make editing a more comfortable experience for the user.
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*Try making changes to this document and press `Ctrl+Z` to undo them. You can
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always recover the original contents of the document.*
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