sync: from linuxdeepin/dtkdeclarative

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Synchronize source files from linuxdeepin/dtkdeclarative.

Source-pull-request: linuxdeepin/dtkdeclarative#343

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关键摘要:

• 在CheckBox、RadioButton和Switch组件中，使用anchors.centerIn: parent可能会导致子组件的布局出现问题，应确保这种布局方式是必要的并且不会影响用户界面。
• 在Switch组件中，将sourceSize.width和sourceSize.height替换为width和height，以及sourceSize的值设置为Qt.size(DS.Style.switchButton.handleWidth, DS.Style.switchButton.handleHeight)可能是为了简化代码，但需要确保这一改动不会破坏现有的布局和样式。

合并相似的问题是否建议立即修改:

• 是，建议立即修改以确保代码的整洁性、可读性和布局的预期效果。特别是布局相关的改动，需要确保不会引入新的布局问题。