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Update widget docs to newest version

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david-swift 2024-03-16 07:48:37 +01:00
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commit 8792437357
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14
user-manual/Advanced/CreatingWidgets.md
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@ -28,7 +28,7 @@ struct CustomText: Widget {
var text: String
public func container(modifiers: [(View) -> View]) -> ViewStorage { }
public func update(_ storage: ViewStorage, modifiers: [(View) -> View]) { }
public func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) { }
}
```
@ -44,20 +44,22 @@ func container(modifiers: [(View) -> View]) -> ViewStorage {
}
```
## The `update(_:modifiers:)` Function
Whenever a state of the app changes, the `update(_:)` function of the widget gets called.
## The `update(_:modifiers:updateProperties:)` Function
Whenever a state of the app changes, the `update(_:modifiers:updateProperties:)` function of the widget gets called.
You get the view storage that you have previously initialized as a parameter.
Update the storage to reflect the current state of the widget:
```swift
func update(_ storage: ViewStorage, modifiers: [(View) -> View]) {
gtk_label_set_label(storage.pointer, text)
func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) {
if updateProperties {
gtk_label_set_label(storage.pointer, text)
}
}
```
## Containers
Some widgets act as containers that accept other widgets as children.
In that case, use the `ViewStorage`'s `content` property for storing their view storages.
In the `update(_:modifiers:)` function, update the children's storages.
In the `update(_:modifiers:updateProperties:)` function, update the children's storages.
An example showcasing how to implement containers is the [Box][1] (it is auto-generated).
[1]: ../../Sources/Adwaita/View/Generated/Box.swift