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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.gui.QWidget
com.trolltech.qt.gui.QLineEdit
public class QLineEdit
The QLineEdit widget is a one-line text editor.
A line edit allows the user to enter and edit a single line of plain text with a useful collection of editing functions, including undo and redo, cut and paste, and drag and drop.
By changing the echoMode of a line edit, it can also be used as a "write-only" field, for inputs such as passwords.
The length of the text can be constrained to maxLength. The text can be arbitrarily constrained using a validator or an inputMask, or both.
A related class is QTextEdit which allows multi-line, rich text editing.
You can change the text with setText or insert. The text is retrieved with text; the displayed text (which may be different, see EchoMode) is retrieved with displayText. Text can be selected with setSelection or selectAll, and the selection can be cut, copyied and pasted. The text can be aligned with setAlignment.
When the text changes the textChanged signal is emitted; when the text changes other than by calling setText the textEdited signal is emitted; when the cursor is moved the cursorPositionChanged signal is emitted; and when the Return or Enter key is pressed the returnPressed signal is emitted.
When editing is finished, either because the line edit lost focus or Return/Enter is pressed the editingFinished signal is emitted.
Note that if there is a validator set on the line edit, the returnPressed/editingFinished signals will only be emitted if the validator returns QValidator::Acceptable.
By default, QLineEdits have a frame as specified by the Windows and Motif style guides; you can turn it off by calling setFrame(false).
The default key bindings are described below. The line edit also provides a context menu (usually invoked by a right mouse click) that presents some of these editing options.
Keypress | Action |
---|---|
Left Arrow | Moves the cursor one character to the left. |
Shift+Left Arrow | Moves and selects text one character to the left. |
Right Arrow | Moves the cursor one character to the right. |
Shift+Right Arrow | Moves and selects text one character to the right. |
Home | Moves the cursor to the beginning of the line. |
End | Moves the cursor to the end of the line. |
Backspace | Deletes the character to the left of the cursor. |
Ctrl+Backspace | Deletes the word to the left of the cursor. |
Delete | Deletes the character to the right of the cursor. |
Ctrl+Delete | Deletes the word to the right of the cursor. |
Ctrl+A | Select all. |
Ctrl+C | Copies the selected text to the clipboard. |
Ctrl+Insert | Copies the selected text to the clipboard. |
Ctrl+K | Deletes to the end of the line. |
Ctrl+V | Pastes the clipboard text into line edit. |
Shift+Insert | Pastes the clipboard text into line edit. |
Ctrl+X | Deletes the selected text and copies it to the clipboard. |
Shift+Delete | Deletes the selected text and copies it to the clipboard. |
Ctrl+Z | Undoes the last operation. |
Ctrl+Y | Redoes the last undone operation. |
Any other key sequence that represents a valid character, will cause the character to be inserted into the line edit.
![]() | A line edit shown in the Macintosh widget style. |
![]() | A line edit shown in the Windows XP widget style. |
![]() | A line edit shown in the Plastique widget style. |
Nested Class Summary | |
---|---|
static class |
QLineEdit.EchoMode
This enum type describes how a line edit should display its contents. |
Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
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QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Field Summary | |
---|---|
QSignalEmitter.Signal2<java.lang.Integer,java.lang.Integer> |
cursorPositionChanged
This signal is emitted whenever the cursor moves. |
QSignalEmitter.Signal0 |
editingFinished
This signal is emitted when the Return or Enter key is pressed or the line edit loses focus. |
QSignalEmitter.Signal0 |
returnPressed
This signal is emitted when the Return or Enter key is pressed. |
QSignalEmitter.Signal0 |
selectionChanged
This signal is emitted whenever the selection changes. |
QSignalEmitter.Signal1<java.lang.String> |
textChanged
This signal is emitted whenever the text changes. |
QSignalEmitter.Signal1<java.lang.String> |
textEdited
This signal is emitted whenever the text is edited. |
Fields inherited from class com.trolltech.qt.gui.QWidget |
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customContextMenuRequested |
Constructor Summary | |
---|---|
QLineEdit()
Equivalent to QLineEdit(0). |
|
QLineEdit(QWidget parent)
Constructs a line edit with no text. |
|
QLineEdit(java.lang.String arg__1)
Equivalent to QLineEdit(arg__1, 0). |
|
QLineEdit(java.lang.String arg__1,
QWidget parent)
Constructs a line edit containing the text arg__1. |
Method Summary | |
---|---|
Qt.Alignment |
alignment()
Returns the alignment of the line edit. |
void |
backspace()
If no text is selected, deletes the character to the left of the text cursor and moves the cursor one position to the left. |
protected void |
changeEvent(QEvent arg__1)
This function is reimplemented for internal reasons. |
void |
clear()
Clears the contents of the line edit. |
QCompleter |
completer()
Returns the current QCompleter that provides completions. |
protected void |
contextMenuEvent(QContextMenuEvent arg__1)
Shows the standard context menu created with createStandardContextMenu. |
void |
copy()
Copies the selected text to the clipboard, if there is any, and if echoMode is Normal. |
QMenu |
createStandardContextMenu()
This function creates the standard context menu which is shown when the user clicks on the line edit with the right mouse button. |
void |
cursorBackward(boolean mark)
Equivalent to cursorBackward(mark, 1). |
void |
cursorBackward(boolean mark,
int steps)
Moves the cursor back steps characters. |
void |
cursorForward(boolean mark)
Equivalent to cursorForward(mark, 1). |
void |
cursorForward(boolean mark,
int steps)
Moves the cursor forward steps characters. |
int |
cursorPosition()
Returns the current cursor position for this line edit. |
int |
cursorPositionAt(QPoint pos)
Returns the cursor position under the point pos. |
void |
cursorWordBackward(boolean mark)
Moves the cursor one word backward. |
void |
cursorWordForward(boolean mark)
Moves the cursor one word forward. |
void |
cut()
Copies the selected text to the clipboard and deletes it, if there is any, and if echoMode is Normal. |
void |
del()
If no text is selected, deletes the character to the right of the text cursor. |
void |
deselect()
Deselects any selected text. |
java.lang.String |
displayText()
Returns the displayed text. |
boolean |
dragEnabled()
Returns whether the lineedit starts a drag if the user presses and moves the mouse on some selected text. |
protected void |
dragEnterEvent(QDragEnterEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
dragLeaveEvent(QDragLeaveEvent e)
This function is reimplemented for internal reasons. |
protected void |
dragMoveEvent(QDragMoveEvent e)
This function is reimplemented for internal reasons. |
protected void |
dropEvent(QDropEvent arg__1)
This function is reimplemented for internal reasons. |
QLineEdit.EchoMode |
echoMode()
Returns the line edit's echo mode. |
void |
end(boolean mark)
Moves the text cursor to the end of the line unless it is already there. |
boolean |
event(QEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
focusInEvent(QFocusEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
focusOutEvent(QFocusEvent arg__1)
This function is reimplemented for internal reasons. |
static QLineEdit |
fromNativePointer(QNativePointer nativePointer)
This function returns the QLineEdit instance pointed to by nativePointer |
boolean |
hasAcceptableInput()
Returns whether the input satisfies the inputMask and the validator.. |
boolean |
hasFrame()
Returns whether the line edit draws itself with a frame. |
boolean |
hasSelectedText()
Returns whether there is any text selected. |
void |
home(boolean mark)
Moves the text cursor to the beginning of the line unless it is already there. |
protected void |
initStyleOption(QStyleOptionFrame option)
This is a overloaded function provided for convenience. |
java.lang.String |
inputMask()
Returns The validation input mask. |
protected void |
inputMethodEvent(QInputMethodEvent arg__1)
This function is reimplemented for internal reasons. |
java.lang.Object |
inputMethodQuery(Qt.InputMethodQuery arg__1)
This function is reimplemented for internal reasons. |
void |
insert(java.lang.String arg__1)
Deletes any selected text, inserts arg__1, and validates the result. |
boolean |
isModified()
Returns whether the line edit's contents has been modified by the user. |
boolean |
isReadOnly()
Returns whether the line edit is read only.. |
boolean |
isRedoAvailable()
Returns whether redo is available. |
boolean |
isUndoAvailable()
Returns whether undo is available. |
protected void |
keyPressEvent(QKeyEvent arg__1)
Converts the given key press arg__1 into a line edit action. |
int |
maxLength()
Returns the maximum permitted length of the text. |
QSize |
minimumSizeHint()
Returns a minimum size for the line edit. |
protected void |
mouseDoubleClickEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
mouseMoveEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
mouseReleaseEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons. |
void |
paste()
Inserts the clipboard's text at the cursor position, deleting any selected text, providing the line edit is not read-only. |
void |
redo()
Redoes the last operation if redo is available. |
void |
selectAll()
Selects all the text (i.e. highlights it) and moves the cursor to the end. |
java.lang.String |
selectedText()
Returns the selected text. |
int |
selectionStart()
selectionStart returns the index of the first selected character in the line edit or -1 if no text is selected. |
void |
setAlignment(Qt.Alignment flag)
Sets the alignment of the line edit to flag. |
void |
setAlignment(Qt.AlignmentFlag... flag)
Sets the alignment of the line edit to flag. |
void |
setCompleter(QCompleter completer)
Sets this line edit to provide auto completions from the completer, completer. |
void |
setCursorPosition(int arg__1)
Sets the current cursor position for this line edit to arg__1. |
void |
setDragEnabled(boolean b)
Sets whether the lineedit starts a drag if the user presses and moves the mouse on some selected text to b. |
void |
setEchoMode(QLineEdit.EchoMode arg__1)
Sets the line edit's echo mode to arg__1. |
void |
setFrame(boolean arg__1)
Sets whether the line edit draws itself with a frame to arg__1. |
void |
setInputMask(java.lang.String inputMask)
Sets The validation input mask to inputMask. |
void |
setMaxLength(int arg__1)
Sets the maximum permitted length of the text to arg__1. |
void |
setModified(boolean arg__1)
Sets whether the line edit's contents has been modified by the user to arg__1. |
void |
setReadOnly(boolean arg__1)
Sets whether the line edit is read only. to arg__1. |
void |
setSelection(int arg__1,
int arg__2)
Selects text from position arg__1 and for arg__2 characters. |
void |
setText(java.lang.String arg__1)
Sets the line edit's text to arg__1. |
void |
setValidator(QValidator arg__1)
Sets this line edit to only accept input that the validator, arg__1, will accept. |
QSize |
sizeHint()
Returns a recommended size for the widget. |
java.lang.String |
text()
Returns the line edit's text. |
void |
undo()
Undoes the last operation if undo is available. |
QValidator |
validator()
Returns a pointer to the current input validator, or 0 if no validator has been set. |
Methods inherited from class com.trolltech.qt.core.QObject |
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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Field Detail |
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public final QSignalEmitter.Signal2<java.lang.Integer,java.lang.Integer> cursorPositionChanged
This signal is emitted whenever the cursor moves. The previous position is given by arg__1, and the new position by arg__2.
public final QSignalEmitter.Signal0 editingFinished
This signal is emitted when the Return or Enter key is pressed or the line edit loses focus. Note that if there is a validator or inputMask set on the line edit and enter/return is pressed, the editingFinished signal will only be emitted if the input follows the inputMask and the validator returns QValidator::Acceptable.
public final QSignalEmitter.Signal0 returnPressed
This signal is emitted when the Return or Enter key is pressed. Note that if there is a validator or inputMask set on the line edit, the returnPressed signal will only be emitted if the input follows the inputMask and the validator returns QValidator::Acceptable.
public final QSignalEmitter.Signal0 selectionChanged
This signal is emitted whenever the selection changes.
public final QSignalEmitter.Signal1<java.lang.String> textChanged
This signal is emitted whenever the text changes. The arg__1 argument is the new text.
Unlike textEdited, this signal is also emitted when the text is changed programmatically, for example, by calling setText.
public final QSignalEmitter.Signal1<java.lang.String> textEdited
This signal is emitted whenever the text is edited. The arg__1 argument is the next text.
Unlike textChanged, this signal is not emitted when the text is changed programmatically, for example, by calling setText.
Constructor Detail |
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public QLineEdit()
Equivalent to QLineEdit(0).
public QLineEdit(QWidget parent)
Constructs a line edit with no text.
The maximum text length is set to 32767 characters.
The parent argument is sent to the QWidget constructor.
public QLineEdit(java.lang.String arg__1)
Equivalent to QLineEdit(arg__1, 0).
public QLineEdit(java.lang.String arg__1, QWidget parent)
Constructs a line edit containing the text arg__1.
The cursor position is set to the end of the line and the maximum text length to 32767 characters.
The parent and argument is sent to the QWidget constructor.
Method Detail |
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public final Qt.Alignment alignment()
Returns the alignment of the line edit.
Both horizontal and vertical alignment is allowed here, Qt::AlignJustify will map to Qt::AlignLeft.
Qt::Alignment
public final void backspace()
If no text is selected, deletes the character to the left of the text cursor and moves the cursor one position to the left. If any text is selected, the cursor is moved to the beginning of the selected text and the selected text is deleted.
public final void clear()
Clears the contents of the line edit.
public final QCompleter completer()
Returns the current QCompleter that provides completions.
public final void copy()
Copies the selected text to the clipboard, if there is any, and if echoMode is Normal.
public final QMenu createStandardContextMenu()
This function creates the standard context menu which is shown when the user clicks on the line edit with the right mouse button. It is called from the default contextMenuEvent handler. The popup menu's ownership is transferred to the caller.
public final void cursorBackward(boolean mark)
Equivalent to cursorBackward(mark, 1).
public final void cursorBackward(boolean mark, int steps)
Moves the cursor back steps characters. If mark is true each character moved over is added to the selection; if mark is false the selection is cleared.
public final void cursorForward(boolean mark)
Equivalent to cursorForward(mark, 1).
public final void cursorForward(boolean mark, int steps)
Moves the cursor forward steps characters. If mark is true each character moved over is added to the selection; if mark is false the selection is cleared.
public final int cursorPosition()
Returns the current cursor position for this line edit.
Setting the cursor position causes a repaint when appropriate.
public final int cursorPositionAt(QPoint pos)
Returns the cursor position under the point pos.
public final void cursorWordBackward(boolean mark)
Moves the cursor one word backward. If mark is true, the word is also selected.
public final void cursorWordForward(boolean mark)
Moves the cursor one word forward. If mark is true, the word is also selected.
public final void cut()
Copies the selected text to the clipboard and deletes it, if there is any, and if echoMode is Normal.
If the current validator disallows deleting the selected text, cut will copy without deleting.
public final void del()
If no text is selected, deletes the character to the right of the text cursor. If any text is selected, the cursor is moved to the beginning of the selected text and the selected text is deleted.
public final void deselect()
Deselects any selected text.
public final java.lang.String displayText()
Returns the displayed text.
If echoMode is Normal this returns the same as text; if EchoMode is Password or PasswordEchoOnEdit it returns a string of asterisks text.length characters long, e.g. "******"; if EchoMode is NoEcho returns an empty string, "".
public final boolean dragEnabled()
Returns whether the lineedit starts a drag if the user presses and moves the mouse on some selected text.
Dragging is disabled by default.
public final QLineEdit.EchoMode echoMode()
Returns the line edit's echo mode.
The initial setting is Normal, but QLineEdit also supports NoEcho, Password and PasswordEchoOnEdit modes.
The widget's display and the ability to copy or drag the text is affected by this setting.
public final void end(boolean mark)
Moves the text cursor to the end of the line unless it is already there. If mark is true, text is selected towards the last position; otherwise, any selected text is unselected if the cursor is moved.
public final boolean hasAcceptableInput()
Returns whether the input satisfies the inputMask and the validator..
public final boolean hasFrame()
Returns whether the line edit draws itself with a frame.
If enabled (the default) the line edit draws itself inside a frame, otherwise the line edit draws itself without any frame.
public final boolean hasSelectedText()
Returns whether there is any text selected.
hasSelectedText returns true if some or all of the text has been selected by the user; otherwise returns false.
public final void home(boolean mark)
Moves the text cursor to the beginning of the line unless it is already there. If mark is true, text is selected towards the first position; otherwise, any selected text is unselected if the cursor is moved.
public final java.lang.String inputMask()
Returns The validation input mask.
If no mask is set, inputMask returns an empty string.
Sets the QLineEdit's validation mask. Validators can be used instead of, or in conjunction with masks; see setValidator.
Unset the mask and return to normal QLineEdit operation by passing an empty string ("") or just calling setInputMask with no arguments.
The table below shows the characters that can be used in an input mask. A space character, the default character for a blank, is needed for cases where a character is permitted but not required.
Character | Meaning |
---|---|
A | ASCII alphabetic character required. A-Z, a-z. |
a | ASCII alphabetic character permitted but not required. |
N | ASCII alphanumeric character required. A-Z, a-z, 0-9. |
n | ASCII alphanumeric character permitted but not required. |
X | Any character required. |
x | Any character permitted but not required. |
9 | ASCII digit required. 0-9. |
0 | ASCII digit permitted but not required. |
D | ASCII digit required. 1-9. |
d | ASCII digit permitted but not required (1-9). |
# | ASCII digit or plus/minus sign permitted but not required. |
H | Hexadecimal character required. A-F, a-f, 0-9. |
h | Hexadecimal character permitted but not required. |
B | Binary character required. 0-1. |
b | Binary character permitted but not required. |
> | All following alphabetic characters are uppercased. |
< | All following alphabetic characters are lowercased. |
! | Switch off case conversion. |
\ | Use \ to escape the special characters listed above to use them as separators. |
The mask consists of a string of mask characters and separators, optionally followed by a semicolon and the character used for blanks. The blank characters are always removed from the text after editing.
Examples:
Mask | Notes |
---|---|
000.000.000.000;_ | IP address; blanks are _. |
HH:HH:HH:HH:HH:HH;_ | MAC address |
0000-00-00 | ISO Date; blanks are space |
>AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;# | License number; blanks are - and all (alphabetic) characters are converted to uppercase. |
To get range control (e.g. for an IP address) use masks together with validators.
public final void insert(java.lang.String arg__1)
Deletes any selected text, inserts arg__1, and validates the result. If it is valid, it sets it as the new contents of the line edit.
public final boolean isModified()
Returns whether the line edit's contents has been modified by the user.
The modified flag is never read by QLineEdit; it has a default value of false and is changed to true whenever the user changes the line edit's contents.
This is useful for things that need to provide a default value but do not start out knowing what the default should be (perhaps it depends on other fields on the form). Start the line edit without the best default, and when the default is known, if modified() returns false (the user hasn't entered any text), insert the default value.
Calling setText resets the modified flag to false.
public final boolean isReadOnly()
Returns whether the line edit is read only..
In read-only mode, the user can still copy the text to the clipboard, or drag and drop the text (if echoMode is Normal), but cannot edit it.
QLineEdit does not show a cursor in read-only mode.
public final boolean isRedoAvailable()
Returns whether redo is available.
public final boolean isUndoAvailable()
Returns whether undo is available.
public final int maxLength()
Returns the maximum permitted length of the text.
If the text is too long, it is truncated at the limit.
If truncation occurs any selected text will be unselected, the cursor position is set to 0 and the first part of the string is shown.
If the line edit has an input mask, the mask defines the maximum string length.
public final void paste()
Inserts the clipboard's text at the cursor position, deleting any selected text, providing the line edit is not read-only.
If the end result would not be acceptable to the current validator, nothing happens.
public final void redo()
Redoes the last operation if redo is available.
public final void selectAll()
Selects all the text (i.e. highlights it) and moves the cursor to the end. This is useful when a default value has been inserted because if the user types before clicking on the widget, the selected text will be deleted.
public final java.lang.String selectedText()
Returns the selected text.
If there is no selected text this property's value is an empty string.
public final int selectionStart()
selectionStart returns the index of the first selected character in the line edit or -1 if no text is selected.
public final void setAlignment(Qt.AlignmentFlag... flag)
Sets the alignment of the line edit to flag.
Both horizontal and vertical alignment is allowed here, Qt::AlignJustify will map to Qt::AlignLeft.
Qt::Alignment
public final void setAlignment(Qt.Alignment flag)
Sets the alignment of the line edit to flag.
Both horizontal and vertical alignment is allowed here, Qt::AlignJustify will map to Qt::AlignLeft.
Qt::Alignment
public final void setCompleter(QCompleter completer)
Sets this line edit to provide auto completions from the completer, completer. The completion mode is set using QCompleter::setCompletionMode().
To use a QCompleter with a QValidator or QLineEdit::inputMask, you need to ensure that the model provided to QCompleter contains valid entries. You can use the QSortFilterProxyModel to ensure that the QCompleter's model contains only valid entries.
If completer == 0, setCompleter removes the current completer, effectively disabling auto completion.
public final void setCursorPosition(int arg__1)
Sets the current cursor position for this line edit to arg__1.
Setting the cursor position causes a repaint when appropriate.
public final void setDragEnabled(boolean b)
Sets whether the lineedit starts a drag if the user presses and moves the mouse on some selected text to b.
Dragging is disabled by default.
public final void setEchoMode(QLineEdit.EchoMode arg__1)
Sets the line edit's echo mode to arg__1.
The initial setting is Normal, but QLineEdit also supports NoEcho, Password and PasswordEchoOnEdit modes.
The widget's display and the ability to copy or drag the text is affected by this setting.
public final void setFrame(boolean arg__1)
Sets whether the line edit draws itself with a frame to arg__1.
If enabled (the default) the line edit draws itself inside a frame, otherwise the line edit draws itself without any frame.
public final void setInputMask(java.lang.String inputMask)
Sets The validation input mask to inputMask.
If no mask is set, inputMask returns an empty string.
Sets the QLineEdit's validation mask. Validators can be used instead of, or in conjunction with masks; see setValidator.
Unset the mask and return to normal QLineEdit operation by passing an empty string ("") or just calling setInputMask with no arguments.
The table below shows the characters that can be used in an input mask. A space character, the default character for a blank, is needed for cases where a character is permitted but not required.
Character | Meaning |
---|---|
A | ASCII alphabetic character required. A-Z, a-z. |
a | ASCII alphabetic character permitted but not required. |
N | ASCII alphanumeric character required. A-Z, a-z, 0-9. |
n | ASCII alphanumeric character permitted but not required. |
X | Any character required. |
x | Any character permitted but not required. |
9 | ASCII digit required. 0-9. |
0 | ASCII digit permitted but not required. |
D | ASCII digit required. 1-9. |
d | ASCII digit permitted but not required (1-9). |
# | ASCII digit or plus/minus sign permitted but not required. |
H | Hexadecimal character required. A-F, a-f, 0-9. |
h | Hexadecimal character permitted but not required. |
B | Binary character required. 0-1. |
b | Binary character permitted but not required. |
> | All following alphabetic characters are uppercased. |
< | All following alphabetic characters are lowercased. |
! | Switch off case conversion. |
\ | Use \ to escape the special characters listed above to use them as separators. |
The mask consists of a string of mask characters and separators, optionally followed by a semicolon and the character used for blanks. The blank characters are always removed from the text after editing.
Examples:
Mask | Notes |
---|---|
000.000.000.000;_ | IP address; blanks are _. |
HH:HH:HH:HH:HH:HH;_ | MAC address |
0000-00-00 | ISO Date; blanks are space |
>AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;# | License number; blanks are - and all (alphabetic) characters are converted to uppercase. |
To get range control (e.g. for an IP address) use masks together with validators.
public final void setMaxLength(int arg__1)
Sets the maximum permitted length of the text to arg__1.
If the text is too long, it is truncated at the limit.
If truncation occurs any selected text will be unselected, the cursor position is set to 0 and the first part of the string is shown.
If the line edit has an input mask, the mask defines the maximum string length.
public final void setModified(boolean arg__1)
Sets whether the line edit's contents has been modified by the user to arg__1.
The modified flag is never read by QLineEdit; it has a default value of false and is changed to true whenever the user changes the line edit's contents.
This is useful for things that need to provide a default value but do not start out knowing what the default should be (perhaps it depends on other fields on the form). Start the line edit without the best default, and when the default is known, if modified() returns false (the user hasn't entered any text), insert the default value.
Calling setText resets the modified flag to false.
public final void setReadOnly(boolean arg__1)
Sets whether the line edit is read only. to arg__1.
In read-only mode, the user can still copy the text to the clipboard, or drag and drop the text (if echoMode is Normal), but cannot edit it.
QLineEdit does not show a cursor in read-only mode.
public final void setSelection(int arg__1, int arg__2)
Selects text from position arg__1 and for arg__2 characters. Negative lengths are allowed.
public final void setText(java.lang.String arg__1)
Sets the line edit's text to arg__1.
Setting this property clears the selection, clears the undo/redo history, moves the cursor to the end of the line and resets the modified property to false. The text is not validated when inserted with setText.
The text is truncated to maxLength length.
public final void setValidator(QValidator arg__1)
Sets this line edit to only accept input that the validator, arg__1, will accept. This allows you to place any arbitrary constraints on the text which may be entered.
If arg__1 == 0, setValidator removes the current input validator. The initial setting is to have no input validator (i.e. any input is accepted up to maxLength).
public final java.lang.String text()
Returns the line edit's text.
Setting this property clears the selection, clears the undo/redo history, moves the cursor to the end of the line and resets the modified property to false. The text is not validated when inserted with setText.
The text is truncated to maxLength length.
public final void undo()
Undoes the last operation if undo is available. Deselects any current selection, and updates the selection start to the current cursor position.
public final QValidator validator()
Returns a pointer to the current input validator, or 0 if no validator has been set.
protected void changeEvent(QEvent arg__1)
This function is reimplemented for internal reasons.
changeEvent
in class QWidget
protected void contextMenuEvent(QContextMenuEvent arg__1)
Shows the standard context menu created with createStandardContextMenu.
If you do not want the line edit to have a context menu, you can set its contextMenuPolicy to Qt::NoContextMenu. If you want to customize the context menu, reimplement this function. If you want to extend the standard context menu, reimplement this function, call createStandardContextMenu and extend the menu returned.
void LineEdit::contextMenuEvent(QContextMenuEvent *event)
{
QMenu *menu = createStandardContextMenu();
menu->addAction(tr("My Menu Item"));
//...
menu->exec(event->globalPos());
delete menu;
}
The arg__1 parameter is used to obtain the position where the mouse cursor was when the event was generated.
contextMenuEvent
in class QWidget
protected void dragEnterEvent(QDragEnterEvent arg__1)
This function is reimplemented for internal reasons.
dragEnterEvent
in class QWidget
protected void dragLeaveEvent(QDragLeaveEvent e)
This function is reimplemented for internal reasons.
dragLeaveEvent
in class QWidget
protected void dragMoveEvent(QDragMoveEvent e)
This function is reimplemented for internal reasons.
dragMoveEvent
in class QWidget
protected void dropEvent(QDropEvent arg__1)
This function is reimplemented for internal reasons.
dropEvent
in class QWidget
public boolean event(QEvent arg__1)
This function is reimplemented for internal reasons.
event
in class QWidget
protected void focusInEvent(QFocusEvent arg__1)
This function is reimplemented for internal reasons.
focusInEvent
in class QWidget
protected void focusOutEvent(QFocusEvent arg__1)
This function is reimplemented for internal reasons.
focusOutEvent
in class QWidget
protected void inputMethodEvent(QInputMethodEvent arg__1)
This function is reimplemented for internal reasons.
inputMethodEvent
in class QWidget
public java.lang.Object inputMethodQuery(Qt.InputMethodQuery arg__1)
This function is reimplemented for internal reasons.
inputMethodQuery
in class QWidget
protected void keyPressEvent(QKeyEvent arg__1)
Converts the given key press arg__1 into a line edit action.
If Return or Enter is pressed and the current text is valid (or can be made valid by the validator), the signal returnPressed is emitted.
The default key bindings are listed in the class's detailed description.
keyPressEvent
in class QWidget
public QSize minimumSizeHint()
Returns a minimum size for the line edit.
The width returned is enough for at least one character.
minimumSizeHint
in class QWidget
protected void mouseDoubleClickEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mouseDoubleClickEvent
in class QWidget
protected void mouseMoveEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mouseMoveEvent
in class QWidget
Example
protected void mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mousePressEvent
in class QWidget
Example
protected void mouseReleaseEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mouseReleaseEvent
in class QWidget
Example
protected void paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons.
paintEvent
in class QWidget
public QSize sizeHint()
Returns a recommended size for the widget.
The width returned, in pixels, is usually enough for about 15 to 20 characters.
sizeHint
in class QWidget
public static QLineEdit fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.protected final void initStyleOption(QStyleOptionFrame option)
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