PySide.QtDeclarative.QDeclarativePropertyMap class allows you to set key-value pairs that can be used in QML bindings.
PySide.QtDeclarative.QDeclarativePropertyMap provides a convenient way to expose domain data to the UI layer. The following example shows how you might declare data in C++ and then access it in QML.
In the C++ file:
# create our data
ownerData = QDeclarativePropertyMap()
ownerData.insert("name", "John Smith")
ownerData.insert("phone", "555-5555")
# expose it to the UI layer
view = QDeclarativeView()
ctxt = view.rootContext()
ctxt.setContextProperty("owner", ownerData)
view.setSource(QUrl.fromLocalFile("main.qml"))
view.show()
Then, in main.qml :
Text { text: owner.name + " " + owner.phone }
The binding is dynamic - whenever a key's value is updated, anything bound to that key will be updated as well.
To detect value changes made in the UI layer you can connect to the PySide.QtDeclarative.QDeclarativePropertyMap.valueChanged() signal. However, note that PySide.QtDeclarative.QDeclarativePropertyMap.valueChanged() is NOT emitted when changes are made by calling PySide.QtDeclarative.QDeclarativePropertyMap.insert() or PySide.QtDeclarative.QDeclarativePropertyMap.clear() - it is only emitted when a value is updated from QML.
注意
It is not possible to remove keys from the map; once a key has been added, you can only modify or clear its associated value.
| 参数： | parent – PySide.QtCore.QObject |
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Constructs a bindable map with parent object parent .
| 参数： | key – unicode |
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Clears the value (if any) associated with key .
| 参数： | key – unicode |
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| 返回类型： | PySide.QtCore.bool |
Returns true if the map contains key .
| 返回类型： | PySide.QtCore.int |
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这是重载函数。
| 参数： |
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Sets the value associated with key to value .
If the key doesn't exist, it is automatically created.
| 返回类型： | PySide.QtCore.bool |
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Returns true if the map contains no keys; otherwise returns false.
| 返回类型： | list of strings |
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| 参数： | key – unicode |
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| 返回类型： | object |
这是重载函数。
| 返回类型： | PySide.QtCore.int |
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Returns the number of keys in the map.
| 参数： | key – unicode |
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| 返回类型： | object |
Returns the value associated with key .
If no value has been set for this key (or if the value has been cleared), an invalid PySide.QtCore.QVariant 被返回。
| 参数： |
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