QStyleOptionGraphicsItem 類是所需的描述參數,用於繪製 QGraphicsItem . 更多...
| 頭: |
#include <QStyleOptionGraphicsItem>
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| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
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| qmake: |
QT += widgets
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| 繼承: | QStyleOption |
| enum | StyleOptionType { Type } |
| enum | StyleOptionVersion { Version } |
| QStyleOptionGraphicsItem () | |
| QStyleOptionGraphicsItem (const QStyleOptionGraphicsItem & other ) |
| QRectF | exposedRect |
| qreal | levelOfDetailFromTransform (const QTransform & worldTransform ) |
齣於性能原因,有很少成員函數,且對成員變量的訪問是直接的 (即:使用
.
or
->
運算符)。這使結構易於使用並強調這些隻需通過樣式函數使用參數。
另請參閱 QStyleOption and QGraphicsItem::paint ().
This enum is used to hold information about the type of the style option, and is defined for each QStyleOption 子類。
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionGraphicsItem::Type
|
SO_GraphicsItem
|
提供樣式選項的類型 ( SO_GraphicsItem 對於此類)。 |
類型內部使用通過 QStyleOption ,其子類,和 qstyleoption_cast () to determine the type of style option. In general you do not need to worry about this unless you want to create your own QStyleOption subclass and your own styles.
另請參閱 StyleOptionVersion .
This enum is used to hold information about the version of the style option, and is defined for each QStyleOption 子類。
| 常量 | 值 | 描述 |
|---|---|---|
QStyleOptionGraphicsItem::Version
|
1
|
1 |
版本的使用通過 QStyleOption 子類以實現擴展在不破壞兼容性的情況下。若使用 qstyleoption_cast (),通常不需要校驗它。
另請參閱 StyleOptionType .
Constructs a QStyleOptionGraphicsItem.
構造副本為 other .
[static]
qreal
QStyleOptionGraphicsItem::
levelOfDetailFromTransform
(const
QTransform
&
worldTransform
)
Returns the level of detail from the worldTransform .
Its value represents the maximum value of the height and width of a unity rectangle, mapped using the worldTransform of the painter used to draw the item. By default, if no transformations are applied, its value is 1. If zoomed out 1:2, the level of detail will be 0.5, and if zoomed in 2:1, its value is 2.
另請參閱 QGraphicsScene::minimumRenderSize ().
This variable holds the exposed rectangle, in item coordinates
Make use of this rectangle to speed up item drawing when only parts of the item are exposed. If the whole item is exposed, this rectangle will be the same as QGraphicsItem::boundingRect ().
This member is only initialized for items that have the QGraphicsItem::ItemUsesExtendedStyleOption 設置標誌。