GetOBSRef 解析

最新推荐文章于 2022-11-02 11:02:07 发布

原创最新推荐文章于 2022-11-02 11:02:07 发布 · 290 阅读

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template <typename T>
static T GetOBSRef(QListWidgetItem *item)
{
return item->data(static_cast<int>(QtDataRole::OBSRef)).value<T>();

}

1)先分析一下item->data()

[virtual] QVariant QListWidgetItem::data(int role) const

Returns the item's data for a given role. Reimplement this function if you need extra roles or special behavior for certain roles.

role <<---static_cast<int>(QtDataRole::OBSRef)

2)再分析下QtDataRole::OBSRef

enum class QtDataRole {
OBSRef = Qt::UserRole,//OBSRef = UserRole
OBSSignals,
};

3)分析下UserRole

enum ItemDataRole {
DisplayRole = 0,
DecorationRole = 1,
EditRole = 2,
ToolTipRole = 3,
StatusTipRole = 4,
WhatsThisRole = 5,
// Metadata
FontRole = 6,
TextAlignmentRole = 7,
BackgroundColorRole = 8,
BackgroundRole = 8,
TextColorRole = 9,
ForegroundRole = 9,
CheckStateRole = 10,
// Accessibility
AccessibleTextRole = 11,
AccessibleDescriptionRole = 12,
// More general purpose
SizeHintRole = 13,
InitialSortOrderRole = 14,
// Internal UiLib roles. Start worrying when public roles go that high.
DisplayPropertyRole = 27,
DecorationPropertyRole = 28,
ToolTipPropertyRole = 29,
StatusTipPropertyRole = 30,
WhatsThisPropertyRole = 31,
// Reserved
UserRole = 0x0100//其中的一种
};

4）QVariant

QVariant行为类似于C/C++的union, 但在Qt中比union强大很多, QVariant内置支持所有QMetaType::Type里的类型如:int,QString,QFont等甚至QList<QVariant>,
QMap<QString, QVariant>等组成的任意复杂类型. 主要应该在Qt项中附带额外的数据,如setData(),setItemData()等,和数据序列化中.简单的说QVariant可存储任意类型.

5）使用

GetOBSRef<OBSScene>(item)