DisplaySettings Class
The DisplaySettings class specifies display settings. More...
| Header: | #include <DisplaySettings> |
| qmake: | QT += displaysettings |
| Inherits: | QObject |
Properties
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Public Functions
| DisplaySettings(QObject *parent = Q_NULLPTR) | |
| virtual | ~DisplaySettings() |
| int | displayBrightness() |
| int | physicalScreenHeightMm() const |
| int | physicalScreenSizeInch() const |
| bool | physicalScreenSizeOverride() const |
| int | physicalScreenWidthMm() const |
Public Slots
| bool | setDisplayBrightness(int v) |
| void | setPhysicalScreenHeightMm(int newHeight) |
| void | setPhysicalScreenSizeInch(int inches) |
| void | setPhysicalScreenSizeOverride(bool enable) |
| void | setPhysicalScreenWidthMm(int newWidth) |
Signals
| void | displayBrightnessChanged(int newValue) |
| void | physicalScreenHeightMmChanged(int newValue) |
| void | physicalScreenSizeInchChanged(int newInches) |
| void | physicalScreenSizeOverrideChanged(bool newValue) |
| void | physicalScreenWidthMmChanged(int newValue) |
Detailed Description
The Boot to Qt demo launcher and Qt Quick Controls scale automatically to screens of different sizes, from 7-inch touch screens to 60-inch or larger television screens to ensure readability and touch friendliness. For this, Qt has to know the physical dimensions of the screen. By default, it tries to query these values from the framebuffer devices. However, many kernel drivers do not provide this information.
The display settings enable overriding and manually setting the physical screen size.
In addition, you can set the display brightness. That is, the intensity of the backlight.
Property Documentation
displayBrightness : int
This property holds the display brightness.
A value of 255 requests the maximum brightness, while that of 0 requests the minimum (typically, the backlight turned off).
Access functions:
| int | displayBrightness() |
| bool | setDisplayBrightness(int v) |
Notifier signal:
| void | displayBrightnessChanged(int newValue) |
physicalScreenHeightMm : int
This property holds the physical screen height in millimeters.
Access functions:
| int | physicalScreenHeightMm() const |
| void | setPhysicalScreenHeightMm(int newHeight) |
Notifier signal:
| void | physicalScreenHeightMmChanged(int newValue) |
physicalScreenSizeInch : int
This property holds the physical screen size in inches.
Access functions:
| int | physicalScreenSizeInch() const |
| void | setPhysicalScreenSizeInch(int inches) |
Notifier signal:
| void | physicalScreenSizeInchChanged(int newInches) |
physicalScreenSizeOverride : bool
This property holds whether to use the value set for the physical screen size.
Access functions:
| bool | physicalScreenSizeOverride() const |
| void | setPhysicalScreenSizeOverride(bool enable) |
Notifier signal:
| void | physicalScreenSizeOverrideChanged(bool newValue) |
physicalScreenWidthMm : int
This property holds the physical screen width in millimeters.
Access functions:
| int | physicalScreenWidthMm() const |
| void | setPhysicalScreenWidthMm(int newWidth) |
Notifier signal:
| void | physicalScreenWidthMmChanged(int newValue) |
Member Function Documentation
DisplaySettings::DisplaySettings(QObject *parent = Q_NULLPTR)
Creates a new display settings object with the parent parent.
[slot] bool DisplaySettings::setDisplayBrightness(int v)
Sets the display brightness to v.
Returns true on success.
Note: Setter function for property displayBrightness.
See also displayBrightness().
[slot] void DisplaySettings::setPhysicalScreenHeightMm(int newHeight)
Sets the physical screen height to newHeight.
Note: Setter function for property physicalScreenHeightMm.
See also physicalScreenHeightMm().
[slot] void DisplaySettings::setPhysicalScreenSizeInch(int inches)
Sets the physical screen size to inches.
Note: Setter function for property physicalScreenSizeInch.
See also physicalScreenSizeInch().
[slot] void DisplaySettings::setPhysicalScreenSizeOverride(bool enable)
Sets whether the value set for the physical screen size is used to enable.
Note: Setter function for property physicalScreenSizeOverride.
See also physicalScreenSizeOverride() and physicalScreenSizeInch().
[slot] void DisplaySettings::setPhysicalScreenWidthMm(int newWidth)
Sets the physical screen width to newWidth.
Note: Setter function for property physicalScreenWidthMm.
See also physicalScreenWidthMm().
[virtual] DisplaySettings::~DisplaySettings()
Deletes the display settings object.
int DisplaySettings::displayBrightness()
Returns the current backlight intensity.
Note: Getter function for property displayBrightness.
See also setDisplayBrightness.
int DisplaySettings::physicalScreenHeightMm() const
Returns the physical screen height in millimeters.
Note: Getter function for property physicalScreenHeightMm.
See also setPhysicalScreenHeightMm().
int DisplaySettings::physicalScreenSizeInch() const
Returns the physical screen size in inches.
Note: Getter function for property physicalScreenSizeInch.
See also setPhysicalScreenSizeInch().
bool DisplaySettings::physicalScreenSizeOverride() const
Returns whether the value set for the physical screen size is used.
Note: Getter function for property physicalScreenSizeOverride.
See also setPhysicalScreenSizeOverride() and physicalScreenSizeInch().
int DisplaySettings::physicalScreenWidthMm() const
Returns the physical screen width in millimeters.
Note: Getter function for property physicalScreenWidthMm.
See also setPhysicalScreenWidthMm().
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