QStyleHints Class

The QStyleHints class contains platform specific hints and settings. More...

Header: #include <QStyleHints>
qmake: QT += gui
Since: Qt 5.0
Inherits: QObject

Properties

  • 1 property inherited from QObject

Public Functions

int cursorFlashTime() const
qreal fontSmoothingGamma() const
int keyboardAutoRepeatRate() const
int keyboardInputInterval() const
int mouseDoubleClickInterval() const
int mousePressAndHoldInterval() const
QChar passwordMaskCharacter() const
int passwordMaskDelay() const
bool setFocusOnTouchRelease() const
void setUseHoverEffects(bool useHoverEffects)
bool showIsFullScreen() const
bool showIsMaximized() const
bool singleClickActivation() const
int startDragDistance() const
int startDragTime() const
int startDragVelocity() const
Qt::TabFocusBehavior tabFocusBehavior() const
bool useHoverEffects() const
bool useRtlExtensions() const
int wheelScrollLines() const
  • 32 public functions inherited from QObject

Signals

void cursorFlashTimeChanged(int cursorFlashTime)
void keyboardInputIntervalChanged(int keyboardInputInterval)
void mouseDoubleClickIntervalChanged(int mouseDoubleClickInterval)
void mousePressAndHoldIntervalChanged(int mousePressAndHoldInterval)
void startDragDistanceChanged(int startDragDistance)
void startDragTimeChanged(int startDragTime)
void tabFocusBehaviorChanged(Qt::TabFocusBehavior tabFocusBehavior)
void useHoverEffectsChanged(bool useHoverEffects)
void wheelScrollLinesChanged(int scrollLines)

Additional Inherited Members

  • 1 public slot inherited from QObject
  • 11 static public members inherited from QObject
  • 9 protected functions inherited from QObject

Detailed Description

The QStyleHints class contains platform specific hints and settings.

An object of this class, obtained from QGuiApplication, provides access to certain global user interface parameters of the current platform.

Access is read only; typically the platform itself provides the user a way to tune these parameters.

Access to these parameters are useful when implementing custom user interface components, in that they allow the components to exhibit the same behaviour and feel as other components.

See also QGuiApplication::styleHints().

Property Documentation

cursorFlashTime : const int

This property holds the text cursor's flash (blink) time in milliseconds.

The flash time is the time used to display, invert and restore the caret display. Usually the text cursor is displayed for half the cursor flash time, then hidden for the same amount of time.

Access functions:

int cursorFlashTime() const

Notifier signal:

void cursorFlashTimeChanged(int cursorFlashTime)

fontSmoothingGamma : const qreal

This property holds the gamma value used in font smoothing.

Access functions:

qreal fontSmoothingGamma() const

keyboardAutoRepeatRate : const int

This property holds the rate, in events per second, in which additional repeated key presses will automatically be generated if a key is being held down.

Access functions:

int keyboardAutoRepeatRate() const

keyboardInputInterval : const int

This property holds the time limit, in milliseconds, that distinguishes a key press from two consecutive key presses.

Access functions:

int keyboardInputInterval() const

Notifier signal:

void keyboardInputIntervalChanged(int keyboardInputInterval)

mouseDoubleClickInterval : const int

This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks.

Access functions:

int mouseDoubleClickInterval() const

Notifier signal:

void mouseDoubleClickIntervalChanged(int mouseDoubleClickInterval)

mousePressAndHoldInterval : const int

This property holds the time limit in milliseconds that activates a press and hold.

This property was introduced in Qt 5.3.

Access functions:

int mousePressAndHoldInterval() const

Notifier signal:

void mousePressAndHoldIntervalChanged(int mousePressAndHoldInterval)

passwordMaskCharacter : const QChar

This property holds the character used to mask the characters typed into text input fields in password mode.

Access functions:

QChar passwordMaskCharacter() const

passwordMaskDelay : const int

This property holds the time, in milliseconds, a typed letter is displayed unshrouded in a text input field in password mode.

Access functions:

int passwordMaskDelay() const

setFocusOnTouchRelease : const bool

This property holds the event that should set input focus on focus objects.

This property is true if focus objects (line edits etc) should receive input focus after a touch/mouse release. This is normal behavior on touch platforms. On desktop platforms, the standard is to set focus already on touch/mouse press.

Access functions:

bool setFocusOnTouchRelease() const

showIsFullScreen : const bool

This property holds whether the platform defaults to fullscreen windows.

This property is true if the platform defaults to windows being fullscreen, otherwise false.

Note: The platform may still choose to show certain windows non-fullscreen, such as popups or dialogs. This property only reports the default behavior.

Access functions:

bool showIsFullScreen() const

See also QWindow::show() and showIsMaximized().

showIsMaximized : const bool

This property holds whether the platform defaults to maximized windows.

This property is true if the platform defaults to windows being maximized, otherwise false.

Note: The platform may still choose to show certain windows non-maximized, such as popups or dialogs. This property only reports the default behavior.

This property was introduced in Qt 5.6.

Access functions:

bool showIsMaximized() const

See also QWindow::show() and showIsFullScreen().

singleClickActivation : const bool

This property holds whether items are activated by single or double click.

This property is true if items should be activated by single click, false if they should be activated by double click instead.

This property was introduced in Qt 5.5.

Access functions:

bool singleClickActivation() const

startDragDistance : const int

This property holds the distance, in pixels, that the mouse must be moved with a button held down before a drag and drop operation will begin.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has moved the cursor a certain distance with a button held down, you should use this property's value as the minimum distance required.

For example, if the mouse position of the click is stored in startPos and the current position (e.g. in the mouse move event) is currentPos, you can find out if a drag should be started with code like this:

if ((startPos - currentPos).manhattanLength() >=
        QApplication::startDragDistance())
    startTheDrag();

Access functions:

int startDragDistance() const

Notifier signal:

void startDragDistanceChanged(int startDragDistance)

See also startDragTime, QPoint::manhattanLength(), and Drag and Drop.

startDragTime : const int

This property holds the time, in milliseconds, that a mouse button must be held down before a drag and drop operation will begin.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has held down a mouse button for a certain amount of time, you should use this property's value as the delay.

Access functions:

int startDragTime() const

Notifier signal:

void startDragTimeChanged(int startDragTime)

See also startDragDistance and Drag and Drop.

startDragVelocity : const int

This property holds the limit for the velocity, in pixels per second, that the mouse may be moved, with a button held down, for a drag and drop operation to begin. A value of 0 means there is no such limit.

Access functions:

int startDragVelocity() const

See also startDragDistance and Drag and Drop.

tabFocusBehavior : const Qt::TabFocusBehavior

This property holds the focus behavior on press of the tab key.

Note: Do not bind this value in QML because the change notifier signal is not implemented yet.

This property was introduced in Qt 5.5.

Access functions:

Qt::TabFocusBehavior tabFocusBehavior() const

Notifier signal:

void tabFocusBehaviorChanged(Qt::TabFocusBehavior tabFocusBehavior)

useHoverEffects : bool

This property holds whether UI elements use hover effects.

This property is true if UI elements should use hover effects. This is the standard behavior on desktop platforms with a mouse pointer, whereas on touch platforms the overhead of hover event delivery can be avoided.

This property was introduced in Qt 5.8.

Access functions:

bool useHoverEffects() const
void setUseHoverEffects(bool useHoverEffects)

Notifier signal:

void useHoverEffectsChanged(bool useHoverEffects)

useRtlExtensions : const bool

This property holds the writing direction.

This property is true if right-to-left writing direction is enabled, otherwise false.

Access functions:

bool useRtlExtensions() const

wheelScrollLines : const int

Number of lines to scroll by default for each wheel click.

This property was introduced in Qt 5.9.

Access functions:

int wheelScrollLines() const

Notifier signal:

void wheelScrollLinesChanged(int scrollLines)

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