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# QKeySequence Class Reference
[QtGui module]

The QKeySequence class encapsulates a key sequence as used by shortcuts. More...

### Types

- enum SequenceFormat { NativeText, PortableText }
- enum SequenceMatch { NoMatch, PartialMatch, ExactMatch }
- enum StandardKey { UnknownKey, HelpContents, WhatsThis, Open, ..., DeleteEndOfLine }

### Methods

- __init__ (self)
- __init__ (self, QKeySequence ks)
- __init__ (self, int k1, int k2 = 0, int k3 = 0, int k4 = 0)
- __init__ (self, QVariant variant)
- unsigned long count (self)
- bool isDetached (self)
- bool isEmpty (self)
- SequenceMatch matches (self, QKeySequence seq)
- QString toString (self, SequenceFormat format = QKeySequence.PortableText)

### Static Methods

- QKeySequence fromString (QString str, SequenceFormat format = QKeySequence.PortableText)
- QKeySequence-list keyBindings (StandardKey key)
- QKeySequence mnemonic (QString text)

### Special Methods

- bool __eq__ (self, QKeySequence other)
- bool __ge__ (self, QKeySequence other)
- int __getitem__ (self, int i)
- bool __gt__ (self, QKeySequence other)
- int __int__ (self)
- bool __le__ (self, QKeySequence other)
- bool __lt__ (self, QKeySequence ks)
- bool __ne__ (self, QKeySequence other)

## Detailed Description

This class can be pickled.

StandardKey, QString or a Python int object may be used whenever QKeySequence is expected.

The QKeySequence class encapsulates a key sequence as used by shortcuts.

In its most common form, a key sequence describes a combination of keys that must be used together to perform some action. Key sequences are used with QAction objects to specify which keyboard shortcuts can be used to trigger actions.

Key sequences can be constructed for use as keyboard shortcuts in three different ways:

- For standard shortcuts, a standard key can be used to request the platform-specific key sequence associated with each shortcut.
- For custom shortcuts, human-readable strings such as "Ctrl+X" can be used, and these can be translated into the appropriate shortcuts for users of different languages. Translations are made in the "QShortcut" context.
- For hard-coded shortcuts, integer key codes can be specified with a combination of values defined by the Qt.Key and Qt.Modifier enum values. Each key code consists of a single Qt.Key value and zero or more modifiers, such as Qt.SHIFT, Qt.CTRL, Qt.ALT and Qt.META.

For example, Ctrl P might be a sequence used as a shortcut for printing a document, and can be specified in any of the following ways:

     QKeySequence(QKeySequence.Print}
     QKeySequence(tr("Ctrl+P"))
     QKeySequence(tr("Ctrl+p"))
     QKeySequence(Qt.CTRL + Qt.Key_P)

Note that, for letters, the case used in the specification string does not matter. In the above examples, the user does not need to hold down the Shift key to activate a shortcut specified with "Ctrl+P". However, for other keys, the use of Shift as an unspecified extra modifier key can lead to confusion for users of an application whose keyboards have different layouts to those used by the developers. See the Keyboard Layout Issues section below for more details.

It is preferable to use standard shortcuts where possible. When creating key sequences for non-standard shortcuts, you should use human-readable strings in preference to hard-coded integer values.

QKeySequence objects can be cast to a QString to obtain a human-readable translated version of the sequence. Similarly, the toString() function produces human-readable strings for use in menus. On Mac OS X, the appropriate symbols are used to describe keyboard shortcuts using special keys on the Macintosh keyboard.

An alternative way to specify hard-coded key codes is to use the Unicode code point of the character; for example, 'A' gives the same key sequence as Qt.Key_A.

Note: On Mac OS X, references to "Ctrl", Qt.CTRL, Qt.Control and Qt.ControlModifier correspond to the Command keys on the Macintosh keyboard, and references to "Meta", Qt.META, Qt.Meta and Qt.MetaModifier correspond to the Control keys. Developers on Mac OS X can use the same shortcut descriptions across all platforms, and their applications will automatically work as expected on Mac OS X.

### Standard Shortcuts

QKeySequence defines many StandardKey standard keyboard shortcuts to reduce the amount of effort required when setting up actions in a typical application. The table below shows some common key sequences that are often used for these standard shortcuts by applications on four widely-used platforms. Note that on Mac OS X, the Ctrl value corresponds to the Command keys on the Macintosh keyboard, and the Meta value corresponds to the Control keys.

StandardKey | Windows | Mac OS X | KDE | GNOME
--- | --- | --- | --- | ---
HelpContents | F1 | Ctrl+? | F1 | F1
WhatsThis | Shift+F1 | Shift+F1 | Shift+F1 | Shift+F1
Open | Ctrl+O | Ctrl+O | Ctrl+O | Ctrl+O
Close | Ctrl+F4, Ctrl+W | Ctrl+W, Ctrl+F4 | Ctrl+W | Ctrl+W
Save | Ctrl+S | Ctrl+S | Ctrl+S | Ctrl+S
New | Ctrl+N | Ctrl+N | Ctrl+N | Ctrl+N
Delete | Del | Del, Meta+D | Del, Ctrl+D | Del, Ctrl+D
Cut | Ctrl+X, Shift+Del | Ctrl+X | Ctrl+X, F20, Shift+Del | Ctrl+X, F20, Shift+Del
Copy | Ctrl+C, Ctrl+Ins | Ctrl+C | Ctrl+C, F16, Ctrl+Ins | Ctrl+C, F16, Ctrl+Ins
Paste | Ctrl+V, Shift+Ins | Ctrl+V | Ctrl+V, F18, Shift+Ins | Ctrl+V, F18, Shift+Ins
Undo | Ctrl+Z, Alt+Backspace | Ctrl+Z | Ctrl+Z, F14 | Ctrl+Z, F14
Redo | Ctrl+Y, Shift+Ctrl+Z, Alt+Shift+Backspace | Ctrl+Shift+Z, Ctrl+Y | Ctrl+Shift+Z | Ctrl+Shift+Z
Back | Alt+Left, Backspace | Ctrl+[ | Alt+Left | Alt+Left
Forward | Alt+Right, Shift+Backspace | Ctrl+] | Alt+Right | Alt+Right
Refresh | F5 | F5 | F5 | Ctrl+R, F5
ZoomIn | Ctrl+Plus | Ctrl+Plus | Ctrl+Plus | Ctrl+Plus
ZoomOut | Ctrl+Minus | Ctrl+Minus | Ctrl+Minus | Ctrl+Minus
Print | Ctrl+P | Ctrl+P | Ctrl+P | Ctrl+P
AddTab | Ctrl+T | Ctrl+T | Ctrl+Shift+N, Ctrl+T | Ctrl+T
NextChild | Ctrl+Tab, Forward, Ctrl+F6 | Ctrl+}, Forward, Ctrl+Tab | Ctrl+Tab, Forward, Ctrl+Comma | Ctrl+Tab, Forward
PreviousChild | Ctrl+Shift+Tab, Back, Ctrl+Shift+F6 | Ctrl+{, Back, Ctrl+Shift+Tab | Ctrl+Shift+Tab, Back, Ctrl+Period | Ctrl+Shift+Tab, Back
Find | Ctrl+F | Ctrl+F | Ctrl+F | Ctrl+F
FindNext | F3, Ctrl+G | Ctrl+G | F3 | Ctrl+G, F3
FindPrevious | Shift+F3, Ctrl+Shift+G | Ctrl+Shift+G | Shift+F3 | Ctrl+Shift+G, Shift+F3
Replace | Ctrl+H | (none) | Ctrl+R | Ctrl+H
SelectAll | Ctrl+A | Ctrl+A | Ctrl+A | Ctrl+A
Bold | Ctrl+B | Ctrl+B | Ctrl+B | Ctrl+B
Italic | Ctrl+I | Ctrl+I | Ctrl+I | Ctrl+I
Underline | Ctrl+U | Ctrl+U | Ctrl+U | Ctrl+U
MoveToNextChar | Right | Right | Right | Right
MoveToPreviousChar | Left | Left | Left | Left
MoveToNextWord | Ctrl+Right | Alt+Right | Ctrl+Right | Ctrl+Right
MoveToPreviousWord | Ctrl+Left | Alt+Left | Ctrl+Left | Ctrl+Left
MoveToNextLine | Down | Down | Down | Down
MoveToPreviousLine | Up | Up | Up | Up
MoveToNextPage | PgDown | PgDown, Alt+PgDown, Meta+Down, Meta+PgDown | PgDown | PgDown
MoveToPreviousPage | PgUp | PgUp, Alt+PgUp, Meta+Up, Meta+PgUp | PgUp | PgUp
MoveToStartOfLine | Home | Ctrl+Left, Meta+Left | Home | Home
MoveToEndOfLine | End | Ctrl+Right, Meta+Right | End | End
MoveToStartOfBlock | (none) | Alt+Up, Meta+A | (none) | (none)
MoveToEndOfBlock | (none) | Alt+Down, Meta+E | (none) | (none)
MoveToStartOfDocument | Ctrl+Home | Ctrl+Up, Home | Ctrl+Home | Ctrl+Home
MoveToEndOfDocument | Ctrl+End | Ctrl+Down, End | Ctrl+End | Ctrl+End
SelectNextChar | Shift+Right | Shift+Right | Shift+Right | Shift+Right
SelectPreviousChar | Shift+Left | Shift+Left | Shift+Left | Shift?left
SelectNextWord | Ctrl+Shift+Right | Alt+Shift+Right | Ctrl+Shift+Right | Ctrl+Shift+Right
SelectPreviousWord | Ctrl+Shift+Left | Alt+Shift+Left | Ctrl+Shift+Left | Ctrl+Shift+Left
SelectNextLine | Shift+Down | Shift+Down | Shift+Down | Shift+Down
SelectPreviousLine | Shift+Up | Shift+Up | Shift+Up | Shift+Up
SelectNextPage | Shift+PgDown | Shift+PgDown | Shift+PgDown | Shift+PgDown
SelectPreviousPage | Shift+PgUp | Shift+PgUp | Shift+PgUp | Shift+PgUp
SelectStartOfLine | Shift+Home | Ctrl+Shift+Left | Shift+Home | Shift+Home
SelectEndOfLine | Shift+End | Ctrl+Shift+Right | Shift+End | Shift+End
SelectStartOfBlock | (none) | Alt+Shift+Up | (none) | (none)
SelectEndOfBlock | (none) | Alt+Shift+Down | (none) | (none)
SelectStartOfDocument | Ctrl+Shift+Home | Ctrl+Shift+Up, Shift+Home | Ctrl+Shift+Home | Ctrl+Shift+Home
SelectEndOfDocument | Ctrl+Shift+End | Ctrl+Shift+Down, Shift+End | Ctrl+Shift+End | Ctrl+Shift+End
DeleteStartOfWord | Ctrl+Backspace | Alt+Backspace | Ctrl+Backspace | Ctrl+Backspace
DeleteEndOfWord | Ctrl+Del | (none) | Ctrl+Del | Ctrl+Del
DeleteEndOfLine | (none) | (none) | Ctrl+K | Ctrl+K

Note that, since the key sequences used for the standard shortcuts differ between platforms, you still need to test your shortcuts on each platform to ensure that you do not unintentionally assign the same key sequence to many actions.

### Keyboard Layout Issues

Many key sequence specifications are chosen by developers based on the layout of certain types of keyboard, rather than choosing keys that represent the first letter of an action's name, such as Ctrl S ("Ctrl+S") or Ctrl C ("Ctrl+C"). Additionally, because certain symbols can only be entered with the help of modifier keys on certain keyboard layouts, key sequences intended for use with one keyboard layout may map to a different key, map to no keys at all, or require an additional modifier key to be used on different keyboard layouts.

For example, the shortcuts, Ctrl plus and Ctrl minus, are often used as shortcuts for zoom operations in graphics applications, and these may be specified as "Ctrl++" and "Ctrl+-" respectively. However, the way these shortcuts are specified and interpreted depends on the keyboard layout. Users of Norwegian keyboards will note that the + and - keys are not adjacent on the keyboard, but will still be able to activate both shortcuts without needing to press the Shift key. However, users with British keyboards will need to hold down the Shift key to enter the + symbol, making the shortcut effectively the same as "Ctrl+Shift+=".

Although some developers might resort to fully specifying all the modifiers they use on their keyboards to activate a shortcut, this will also result in unexpected behavior for users of different keyboard layouts.

For example, a developer using a British keyboard may decide to specify "Ctrl+Shift+=" as the key sequence in order to create a shortcut that coincidentally behaves in the same way as Ctrl plus. However, the = key needs to be accessed using the Shift key on Norwegian keyboard, making the required shortcut effectively Ctrl Shift Shift = (an impossible key combination).

As a result, both human-readable strings and hard-coded key codes can both be problematic to use when specifying a key sequence that can be used on a variety of different keyboard layouts. Only the use of standard shortcuts guarantees that the user will be able to use the shortcuts that the developer intended.

Despite this, we can address this issue by ensuring that human-readable strings are used, making it possible for translations of key sequences to be made for users of different languages. This approach will be successful for users whose keyboards have the most typical layout for the language they are using.

### GNU Emacs Style Key Sequences

Key sequences similar to those used in GNU Emacs, allowing up to four key codes, can be created by using the multiple argument constructor, or by passing a human-readable string of comma-separated key sequences.

For example, the key sequence, Ctrl X followed by Ctrl C, can be specified using either of the following ways:

     QKeySequence(tr("Ctrl+X, Ctrl+C"))
     QKeySequence(Qt.CTRL + Qt.Key_X, Qt.CTRL + Qt.Key_C)

Warning: A QApplication instance must have been constructed before a QKeySequence is created; otherwise, your application may crash.

See also QShortcut.

## Type Documentation

### QKeySequence.SequenceFormat

Constant | Value | Description
--- | --- | ---
`QKeySequence.NativeText` | `0` | The key sequence as a platform specific string. This means that it will be shown translated and on the Mac it will resemble a key sequence from the menu bar. This enum is best used when you want to display the string to the user.
`QKeySequence.PortableText` | `1` | The key sequence is given in a "portable" format, suitable for reading and writing to a file. In many cases, it will look similar to the native text on Windows and X11.

### QKeySequence.SequenceMatch

Constant | Value | Description
--- | --- | ---
`QKeySequence.NoMatch` | `0` | The key sequences are different; not even partially matching.
`QKeySequence.PartialMatch` | `1` | The key sequences match partially, but are not the same.
`QKeySequence.ExactMatch` | `2` | The key sequences are the same.

### QKeySequence.StandardKey

This enum represent standard key bindings. They can be used to assign platform dependent keyboard shortcuts to a QAction. QKeyEvent also provides the function QKeyEvent.standardKey() to query if it matches an existing key binding.

Note that the key bindings are platform dependent. The currently bound shortcuts can be queried using keyBindings().

Constant | Value | Description
--- | --- | ---
`QKeySequence.UnknownKey` | `0` | Unbound key.
`QKeySequence.HelpContents` | `1` | Open help contents.
`QKeySequence.WhatsThis` | `2` | Activate whats this.
`QKeySequence.Open` | `3` | Open Document.
`QKeySequence.Close` | `4` | Close Document/Tab.
`QKeySequence.Save` | `5` | Save Document.
`QKeySequence.New` | `6` | Create new Document.
`QKeySequence.Delete` | `7` | Delete.
`QKeySequence.Cut` | `8` | Cut.
`QKeySequence.Copy` | `9` | Copy.
`QKeySequence.Paste` | `10` | Paste.
`QKeySequence.Undo` | `11` | Undo.
`QKeySequence.Redo` | `12` | Redo.
`QKeySequence.Back` | `13` | Navigate back.
`QKeySequence.Forward` | `14` | Navigate forward.
`QKeySequence.Refresh` | `15` | Refresh or reload current document.
`QKeySequence.ZoomIn` | `16` | Zoom in.
`QKeySequence.ZoomOut` | `17` | Zoom out.
`QKeySequence.Print` | `18` | Print document.
`QKeySequence.AddTab` | `19` | Add new tab.
`QKeySequence.NextChild` | `20` | Navigate to next tab or child window.
`QKeySequence.PreviousChild` | `21` | Navigate to previous tab or child window.
`QKeySequence.Find` | `22` | Find in document.
`QKeySequence.FindNext` | `23` | Find next result.
`QKeySequence.FindPrevious` | `24` | Find previous result.
`QKeySequence.Replace` | `25` | Find and replace.
`QKeySequence.SelectAll` | `26` | Select all text.
`QKeySequence.Bold` | `27` | Bold text.
`QKeySequence.Italic` | `28` | Italic text.
`QKeySequence.Underline` | `29` | Underline text.
`QKeySequence.MoveToNextChar` | `30` | Move cursor to next character.
`QKeySequence.MoveToPreviousChar` | `31` | Move cursor to previous character.
`QKeySequence.MoveToNextWord` | `32` | Move cursor to next word.
`QKeySequence.MoveToPreviousWord` | `33` | Move cursor to previous word.
`QKeySequence.MoveToNextLine` | `34` | Move cursor to next line.
`QKeySequence.MoveToPreviousLine` | `35` | Move cursor to previous line.
`QKeySequence.MoveToNextPage` | `36` | Move cursor to next page.
`QKeySequence.MoveToPreviousPage` | `37` | Move cursor to previous page.
`QKeySequence.MoveToStartOfLine` | `38` | Move cursor to start of line.
`QKeySequence.MoveToEndOfLine` | `39` | Move cursor to end of line.
`QKeySequence.MoveToStartOfBlock` | `40` | Move cursor to start of a block. This shortcut is only used on OS X.
`QKeySequence.MoveToEndOfBlock` | `41` | Move cursor to end of block. This shortcut is only used on the OS X.
`QKeySequence.MoveToStartOfDocument` | `42` | Move cursor to start of document.
`QKeySequence.MoveToEndOfDocument` | `43` | Move cursor to end of document.
`QKeySequence.SelectNextChar` | `44` | Extend selection to next character.
`QKeySequence.SelectPreviousChar` | `45` | Extend selection to previous character.
`QKeySequence.SelectNextWord` | `46` | Extend selection to next word.
`QKeySequence.SelectPreviousWord` | `47` | Extend selection to previous word.
`QKeySequence.SelectNextLine` | `48` | Extend selection to next line.
`QKeySequence.SelectPreviousLine` | `49` | Extend selection to previous line.
`QKeySequence.SelectNextPage` | `50` | Extend selection to next page.
`QKeySequence.SelectPreviousPage` | `51` | Extend selection to previous page.
`QKeySequence.SelectStartOfLine` | `52` | Extend selection to start of line.
`QKeySequence.SelectEndOfLine` | `53` | Extend selection to end of line.
`QKeySequence.SelectStartOfBlock` | `54` | Extend selection to the start of a text block. This shortcut is only used on OS X.
`QKeySequence.SelectEndOfBlock` | `55` | Extend selection to the end of a text block. This shortcut is only used on OS X.
`QKeySequence.SelectStartOfDocument` | `56` | Extend selection to start of document.
`QKeySequence.SelectEndOfDocument` | `57` | Extend selection to end of document.
`QKeySequence.DeleteStartOfWord` | `58` | Delete the beginning of a word up to the cursor.
`QKeySequence.DeleteEndOfWord` | `59` | Delete word from the end of the cursor.
`QKeySequence.DeleteEndOfLine` | `60` | Delete end of line.

This enum was introduced in Qt 4.2.

## Method Documentation

### QKeySequence.__init__ (self)

Constructs an empty key sequence.

### QKeySequence.__init__ (self, QKeySequence ks)

Creates a key sequence from the key string. For example "Ctrl+O" gives CTRL+'O'. The strings "Ctrl", "Shift", "Alt" and "Meta" are recognized, as well as their translated equivalents in the "QShortcut" context (using QObject.tr()).

Up to four key codes may be entered by separating them with commas, e.g. "Alt+X,Ctrl+S,Q".

This constructor is typically used with tr(), so that shortcut keys can be replaced in translations:

     QMenu *file = new QMenu(this);
     file->addAction(tr("&Open..."), this, SLOT(open()),
                       QKeySequence(tr("Ctrl+O", "File|Open")));

Note the "File|Open" translator comment. It is by no means necessary, but it provides some context for the human translator.

### QKeySequence.__init__ (self, int k1, int k2 = 0, int k3 = 0, int k4 = 0)

Constructs a key sequence with up to 4 keys k1, k2, k3 and k4.

The key codes are listed in Qt.Key and can be combined with modifiers (see Qt.Modifier) such as Qt.SHIFT, Qt.CTRL, Qt.ALT, or Qt.META.

### QKeySequence.__init__ (self, QVariant variant)

Copy constructor. Makes a copy of keysequence.

### unsigned long QKeySequence.count (self)

Returns the number of keys in the key sequence. The maximum is 4.

### QKeySequence QKeySequence.fromString (QString str, SequenceFormat format = QKeySequence.PortableText)

Return a QKeySequence from the string str based on format.

This function was introduced in Qt 4.1.

See also toString().

### bool QKeySequence.isDetached (self)

### bool QKeySequence.isEmpty (self)

Returns true if the key sequence is empty; otherwise returns false.

### QKeySequence-list QKeySequence.keyBindings (StandardKey key)

Returns a list of key bindings for the given key. The result of calling this function will vary based on the target platform. The first element of the list indicates the primary shortcut for the given platform. If the result contains more than one result, these can be considered alternative shortcuts on the same platform for the given key.

This function was introduced in Qt 4.2.

### SequenceMatch QKeySequence.matches (self, QKeySequence seq)

Matches the sequence with seq. Returns ExactMatch if successful, PartialMatch if seq matches incompletely, and NoMatch if the sequences have nothing in common. Returns NoMatch if seq is shorter.

### QKeySequence QKeySequence.mnemonic (QString text)

Returns the shortcut key sequence for the mnemonic in text, or an empty key sequence if no mnemonics are found.

For example, mnemonic("E&xit") returns `Qt.ALT+Qt.Key_X`, mnemonic("&Quit") returns `ALT+Key_Q`, and mnemonic("Quit") returns an empty QKeySequence.

We provide a list of common mnemonics in English. At the time of writing, Microsoft and Open Group do not appear to have issued equivalent recommendations for other languages.

See also qt_set_sequence_auto_mnemonic().

### QString QKeySequence.toString (self, SequenceFormat format = QKeySequence.PortableText)

Return a string representation of the key sequence, based on format.

For example, the value Qt.CTRL+Qt.Key_O results in "Ctrl+O". If the key sequence has multiple key codes, each is separated by commas in the string returned, such as "Alt+X, Ctrl+Y, Z". The strings, "Ctrl", "Shift", etc. are translated using QObject.tr() in the "QShortcut" context.

If the key sequence has no keys, an empty string is returned.

On Mac OS X, the string returned resembles the sequence that is shown in the menu bar.

This function was introduced in Qt 4.1.

See also fromString().

### bool QKeySequence.__eq__ (self, QKeySequence other)

### bool QKeySequence.__ge__ (self, QKeySequence other)

### int QKeySequence.__getitem__ (self, int i)

### bool QKeySequence.__gt__ (self, QKeySequence other)

### int QKeySequence.__int__ (self)

### bool QKeySequence.__le__ (self, QKeySequence other)

### bool QKeySequence.__lt__ (self, QKeySequence ks)

### bool QKeySequence.__ne__ (self, QKeySequence other)