[C++]C++ Nativated Property With Event Code Snippet

2011-10-14

5296
0
C++
2012-01-04

筆者在[C++]C++ Nativated Property Code Snippet這篇整理過了Nativated Property的程式碼片斷，但只是便於建立很單純的屬性，若要在屬性中觸發事件就必須要自己下去處理。這邊筆者也稍微將這樣的需求整理一下，程式碼片段的XML內容如下：

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <Title>Nativated Property With Event</Title>
      <Shortcut>npropwe</Shortcut>      
      <Description>Nativated Property with event trigger</Description>
      <Author>Larry Nung</Author>
      <SnippetTypes>
	<SnippetType>Expansion</SnippetType>
      </SnippetTypes>      
    </Header>
    <Snippet>     
      <Declarations>
	<Literal>
	  <ID>type</ID>
	  <ToolTip>Type of property</ToolTip>
	  <Default>int</Default>
	</Literal>
        <Literal Editable="true">
          <ID>field</ID>
          <Type></Type>
          <ToolTip></ToolTip>
          <Default>nValue</Default>
          <Function></Function>
        </Literal>
        <Literal Editable="true">
          <ID>eventArgs</ID>
          <Type></Type>
          <ToolTip></ToolTip>
          <Default>EventArgs</Default>
          <Function></Function>
        </Literal>
      </Declarations>
      <Code Language="Cpp"><![CDATA[#pragma region Var
private:
	$type$ _$field$;
#pragma endregion


#pragma region Public  Property
public:
	__declspec(property(get=Get_$field$,put=Set_$field$))
		$type$ m_$field$;
#pragma endregion



#pragma region Event
public:	
	__event void $field$Changing(void* sender, $eventArgs$* e);
	__event void $field$Changed(void* sender, $eventArgs$* e);
#pragma endregion



#pragma region Property Process Method
public:
	inline $type$ Get_$field$()
	{
		return _$field$;
	}

	inline void Set_$field$($type$ value)
	{
		if(_$field$ == value)
			return;

		$eventArgs$ e;
		On$field$Changing(&e);

		_$field$ = value;

		On$field$Changed(&e);
	}
#pragma endregion


#pragma region Protected Method
protected:
	void On$field$Changing($eventArgs$* e)
	{
		__raise $field$Changing(this, e);
	}

	void On$field$Changed($eventArgs$* e)
	{
		__raise $field$Changed(this, e);
	}
#pragma endregion

]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

使用上在編譯視窗內輸入npropwe，連按兩次[Tab]按鍵就可以了。跑出的程式碼片段會像下面這樣，可以調整屬性的型態、名稱、與事件傳遞的參數型態。

#pragma region Var
private:
	int _nValue;
#pragma endregion


#pragma region Public  Property
public:
	__declspec(property(get=Get_nValue,put=Set_nValue))
		int m_nValue;
#pragma endregion



#pragma region Event
public:	
	__event void nValueChanging(void* sender, EventArgs* e);
	__event void nValueChanged(void* sender, EventArgs* e);
#pragma endregion



#pragma region Property Process Method
public:
	inline int Get_nValue()
	{
		return _nValue;
	}

	inline void Set_nValue(int value)
	{
		if(_nValue == value)
			return;

		EventArgs e;
		OnnValueChanging(&e);

		_nValue = value;

		OnnValueChanged(&e);
	}
#pragma endregion


#pragma region Protected Method
protected:
	void OnnValueChanging(EventArgs* e)
	{
		__raise nValueChanging(this, e);
	}

	void OnnValueChanged(EventArgs* e)
	{
		__raise nValueChanged(this, e);
	}
#pragma endregion

回首頁