Qul Namespace

Provides types and declarations specific to Qt Quick Ultralite and miscellaneous functions related to application life cycle. 更多...

Header: #include <>

名称空间

namespace	平台
namespace	PlatformInterface

类

class	应用程序
class	EventQueue
struct	图像
struct	ImageProvider
struct	ImageWriteGuard
struct	ListModel
class	Object
struct	特性
struct	RootItem
struct	SharedImage
struct	信号
struct	Singleton
class	Timer

类型

enum	EventQueueOverrunPolicy { EventQueueOverrunPolicy_Discard, EventQueueOverrunPolicy_OverwriteOldest }
enum	PixelFormat { PixelFormat_ARGB32_Premultiplied, PixelFormat_ARGB32, PixelFormat_RGB32, PixelFormat_RGB16, PixelFormat_Alpha8, PixelFormat_Invalid }
typedef	qreal

函数

void	appMain (const void * arg = 0)
void	initPlatform ()

详细描述

类

class 应用程序

Application 类用于启动 Qt Quick Ultralite。更多...

class EventQueue

Provides a convenient way to send and receive events across different parts of the application. 更多...

class 图像

An image representation that allows direct access to the pixel data. 更多...

class ImageProvider

The ImageProvider class provides an interface for supporting image requests in QML. 更多...

class ImageWriteGuard

A helper for calling Image::beginWrite () 和 Image::endWrite (). 更多...

class ListModel

Inherit from this class to expose a model to QML. 更多...

class Object

Provides abstract implementation for all items or objects used in Qt Quick Ultralite. 更多...

class 特性

The Property class can be used to hold a property of a given type. 更多...

class RootItem

The RootItem class is a public type used in Application::setRootItem (). 更多...

class 信号

Allows creating a signal that can be connected from QML. 更多...

class Singleton

Inherit from this class to expose the C++ class or struct to the QML as a singleton. 更多...

class Timer

Provides a way to run repetitive and single-shot timers. 更多...

类型文档编制

enum Qul:: EventQueueOverrunPolicy

Defines what happens when an event is posted to a EventQueue and the queue is already full.

常量	值	描述
`Qul::EventQueueOverrunPolicy_Discard`	`0`	If the queue is full, the posted event will be discarded.
`Qul::EventQueueOverrunPolicy_OverwriteOldest`	`1`	If the queue is full, the posted event will overwrite the oldest existing event in the queue. The overwritten event is lost.

enum Qul:: PixelFormat

This enum specifies the pixel format used in an area of memory.

注意： Not all pixel formats are supported on all platforms.

常量	值	描述
`Qul::PixelFormat_ARGB32_Premultiplied`	`1`	Supported on all platforms.
`Qul::PixelFormat_ARGB32`	`0`	Supported on STM32 and NXP.
`Qul::PixelFormat_RGB32`	`2`	Usually supported only when color depth is 32 bits.
`Qul::PixelFormat_RGB16`	`4`	Usually supported only when color depth is 16 bits.
`Qul::PixelFormat_Alpha8`	`5`	Supported on all platforms.
`Qul::PixelFormat_Invalid`	`8`	Represents an invalid pixel format.

typedef Qul:: qreal

Typedef 为 double unless Qt Quick Ultralite runtime is built with QUL_QREAL_SINGLEPRECISION CMake option.

函数文档编制

void Qul:: appMain (const void * arg = 0)

This function initializes and also acts as a main loop for Qt Quick Ultralite application. This function never exits. arg is not used.

Platform hardware needs to be initialized before calling this function.

This function is called implicitly as part of default entry point implementation if app_target_default_entrypoint 被使用。

This function was introduced in Qt Quick Ultralite 1.0.

另请参阅 initPlatform and Qt Quick Ultralite 应用程序的入口点 .

void Qul:: initPlatform ()

Initialize Board Support Package (BSP).

This function must be called before Qt Quick Ultralite is initialized to operate correctly.

It's up to application developer on how and when this function will be called. Typically it's called just before appMain , but developer may also decide not call it all and perform own BSP initialization.