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  2. Qt 5.12.12
  3. Qt Quick Controls 1
  4. QML 类型
  5. TextField QML Type

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TextField QML Type

Displays a single line of editable plain text. 更多...

import 语句： import QtQuick.Controls 1.4
Since: Qt 5.1
继承： FocusScope

特性

信号

方法

详细描述

TextField is used to accept a line of text input. Input constraints can be placed on a TextField item (for example, through a validator or inputMask ). Setting echoMode to an appropriate value enables TextField to be used for a password input field. 

TextField {
    placeholderText: qsTr("Enter name")
}

You can create a custom appearance for a TextField by assigning a TextFieldStyle .

另请参阅 TextArea and TextInput .

特性文档编制

[read-only] acceptableInput : bool

返回 true if the text field contains acceptable text.

If a validator or input mask was set, this property will return true if the current text satisfies the validator or mask as a final string (not as an intermediate string).

默认值为 true .

另请参阅 validator , inputMask ，和 accepted .

activeFocusOnPress : bool

This property is set to true 若 TextField should gain active focus on a mouse press.

默认值为 true .

[read-only] canPaste : bool

返回 true 若 TextField is writable and the content of the clipboard is suitable for pasting into the TextField .

[read-only] canRedo : bool

返回 true 若 TextField is writable and there are undone operations that can be redone.

[read-only] canUndo : bool

返回 true 若 TextField is writable and there are previous operations that can be undone.

cursorPosition : int

This property holds the position of the cursor in the TextField .

[read-only] cursorRectangle : rect

The rectangle where the text cursor is rendered within the text field.

This property was introduced in QtQuick.Controls 1.3.

[read-only] displayText : string

This property holds the text displayed in the TextField .

若 echoMode is set to TextInput::Normal, this holds the same value as the TextField::text property. Otherwise, this property holds the text visible to the user, while the text property holds the actual entered text.

echoMode : enumeration

Specifies how the text should be displayed in the TextField .

The possible modes are:

  • TextInput .Normal - Displays the text as it is. (Default)
  • TextInput .Password - Displays asterisks instead of characters.
  • TextInput .NoEcho - Displays nothing.
  • TextInput .PasswordEchoOnEdit - Displays characters as they are entered while editing, otherwise displays asterisks.

[read-only] effectiveHorizontalAlignment : enumeration

Gets the effective horizontal alignment of the text within the TextField item's width.

horizontalAlignment contains the default horizontal alignment.

另请参阅 horizontalAlignment .

font : font

Sets the font of the TextField .

horizontalAlignment : enumeration

Sets the alignment of the text within the TextField item's width.

By default, the horizontal text alignment follows the natural alignment of the text, for example text that is read from left to right will be aligned to the left.

The possible alignment values are:

When using the attached property, LayoutMirroring::enabled , to mirror application layouts, the horizontal alignment of text will also be mirrored. However, the property horizontalAlignment will remain unchanged. To query the effective horizontal alignment of TextField , use the read-only property effectiveHorizontalAlignment .

[read-only] hovered : bool

This property holds whether the control is being hovered.

inputMask : string

Sets an input mask on the TextField , restricting the allowable text inputs. See QLineEdit::inputMask for further details, as the exact same mask strings are used by TextField .

另请参阅 acceptableInput and validator .

[read-only] inputMethodComposing : bool

This property holds whether the TextField has partial text input from an input method.

While it is composing an input method may rely on mouse or key events from the TextField to edit or commit the partial text. This property can be used to determine when to disable events handlers that may interfere with the correct operation of an input method.

This property was introduced in QtQuick.Controls 1.3.

inputMethodHints : enumeration

Provides hints to the input method about the expected content of the text field and how it should operate.

The value is a bit-wise combination of flags, or Qt.ImhNone if no hints are set.

默认值为 Qt.ImhNone .

Flags that alter behavior are:

  • Qt.ImhHiddenText - Characters should be hidden, as is typically used when entering passwords. This is automatically set when setting echoMode to TextInput.Password .
  • Qt.ImhSensitiveData - Typed text should not be stored by the active input method in any persistent storage like predictive user dictionary.
  • Qt.ImhNoAutoUppercase - The input method should not try to automatically switch to upper case when a sentence ends.
  • Qt.ImhPreferNumbers - Numbers are preferred (but not required).
  • Qt.ImhPreferUppercase - Uppercase letters are preferred (but not required).
  • Qt.ImhPreferLowercase - Lowercase letters are preferred (but not required).
  • Qt.ImhNoPredictiveText - Do not use predictive text (for example, dictionary lookup) while typing.
  • Qt.ImhDate - The text editor functions as a date field.
  • Qt.ImhTime - The text editor functions as a time field.
  • Qt.ImhMultiLine - The text editor doesn't close software input keyboard when Return or Enter key is pressed (since QtQuick .Controls 1.3).

Flags that restrict input (exclusive flags) are:

  • Qt.ImhDigitsOnly - Only digits are allowed.
  • Qt.ImhFormattedNumbersOnly - Only number input is allowed. This includes decimal point and minus sign.
  • Qt.ImhUppercaseOnly - Only uppercase letter input is allowed.
  • Qt.ImhLowercaseOnly - Only lowercase letter input is allowed.
  • Qt.ImhDialableCharactersOnly - Only characters suitable for phone dialing are allowed.
  • Qt.ImhEmailCharactersOnly - Only characters suitable for email addresses are allowed.
  • Qt.ImhUrlCharactersOnly - Only characters suitable for URLs are allowed.

掩码：

  • Qt.ImhExclusiveInputMask - This mask yields nonzero if any of the exclusive flags are used.

[read-only] length : int

Returns the total number of characters in the TextField 项。

若 TextField has an input mask, the length will include mask characters and may differ from the length of the string returned by the text 特性。

This property can be faster than querying the length of the text property as it doesn't require any copying or conversion of the TextField 's internal string data.

maximumLength : int

This property holds the maximum permitted length of the text in the TextField .

若文本太长，则在限制处截取它。

This property contains the edit Menu for working with text selection. Set it to null if no menu is wanted.

This property was introduced in QtQuick.Controls 1.3.

placeholderText : string

This property contains the text that is shown in the text field when the text field is empty.

readOnly : bool

Sets whether user input can modify the contents of the TextField . Read- only is different from a disabled text field in that the text field will appear to be active and text can still be selected and copied.

If readOnly is set to true , then user input will not affect the text. Any bindings or attempts to set the text property will still work, however.

selectByMouse : bool

This property determines if the user can select the text with the mouse.

默认值为 true .

This property was introduced in QtQuick.Controls 1.3.

[read-only] selectedText : string

Provides the text currently selected in the text input.

It is equivalent to the following snippet, but is faster and easier to use. 

myTextField.text.toString().substring(myTextField.selectionStart, myTextField.selectionEnd);

[read-only] selectionEnd : int

The cursor position after the last character in the current selection.

This property is read-only. To change the selection, use select(start,end), selectAll() ，或 selectWord() .

另请参阅 selectionStart , cursorPosition ，和 selectedText .

[read-only] selectionStart : int

The cursor position before the first character in the current selection.

This property is read-only. To change the selection, use select(start,end), selectAll() ，或 selectWord() .

另请参阅 selectionEnd , cursorPosition ，和 selectedText .

text : string

This property contains the text in the TextField .

textColor : color

This property holds the text color.

validator : Validator

Allows you to set a validator on the TextField . When a validator is set, the TextField will only accept input which leaves the text property in an intermediate state. The accepted signal will only be sent if the text is in an acceptable state when enter is pressed.

Currently supported validators are IntValidator , DoubleValidator ，和 RegExpValidator . An example of using validators is shown below, which allows input of integers between 11 and 31 into the text input: 

import QtQuick 2.2
import QtQuick.Controls 1.2
TextField {
    validator: IntValidator {bottom: 11; top: 31;}
    focus: true
}

另请参阅 acceptableInput , inputMask ，和 accepted .

verticalAlignment : enumeration

Sets the alignment of the text within the TextField item's height.

The possible alignment values are:


信号文档编制

accepted ()

此信号发射，当按下 Return/Enter 键。注意，若存在 validator or inputMask set on the text field, the signal will only be emitted if the input is in an acceptable state.

相应处理程序是 onAccepted .

editingFinished ()

This signal is emitted when the Return or Enter key is pressed or the text field loses focus. Note that if there is a validator or inputMask set on the text field and enter/return is pressed, this signal will only be emitted if the input follows the inputMask and the validator returns an acceptable state.

相应处理程序是 onEditingFinished .

This signal was introduced in QtQuick.Controls 1.1.


方法文档编制

void copy ()

Copies the currently selected text to the system clipboard.

void cut ()

Moves the currently selected text to the system clipboard.

void deselect ()

Removes active text selection.

string getText ( int start , int end )

Removes the section of text that is between the start and end positions from the TextField .

void insert ( int position , string text )

插入 text 到 TextField at position .

bool isRightToLeft ( int start , int end )

返回 true if the natural reading direction of the editor text found between positions start and end is right to left.

void paste ()

Replaces the currently selected text by the contents of the system clipboard.

void redo ()

Performs the last operation if redo is available .

void remove ( int start , int end )

Removes the section of text that is between the start and end positions.

This method was introduced in QtQuick.Controls 1.4.

void select ( int start , int end )

Causes the text from start to end to be selected.

If either start or end is out of range, the selection is not changed.

After calling select, selectionStart will become the lesser and selectionEnd will become the greater (regardless of the order passed to this method).

另请参阅 selectionStart and selectionEnd .

void selectAll ()

Causes all text to be selected.

void selectWord ()

Causes the word closest to the current cursor position to be selected.

void undo ()

Reverts the last operation if undo is available . undo() deselects any current selection and updates the selection start to the current cursor position.