C++ (Cpp) HITextViewSetBackgroundColor示例

示例#1

文件： TextView.cpp 项目： arnelh/Examples

OSStatus
TextViewSetBGAlpha( HIViewRef textView, float alpha )
{
	OSStatus status = paramErr;
	
	SInt32 unused;
	CGColorRef prevColor = NULL;
	CGColorRef newColor = NULL;
	
	status = HITextViewCopyBackgroundColor( textView, &prevColor );
  
	require_noerr( status, FAIL );
	
	// make a new copy with alpha
	newColor = CGColorCreateCopyWithAlpha( prevColor, alpha );
	
	require_action( newColor != NULL, FAIL, status = paramErr );

	// reset the new color with alpha
	status = HITextViewSetBackgroundColor( textView, newColor );

	if( newColor != NULL )
		CGColorRelease( newColor );
		
	FAIL:
	return status;
}

示例#2

文件： document_window.c 项目： fruitsamples/HITextViewDemo

//---------------------------------------------------------------------
// Sets the alpha of an HITextView to the specified value
//
OSStatus TextViewSetAlpha(HIViewRef textView, float alpha)
{
	CGColorRef prevColor, newColor;
	OSStatus status;
	
	status = HITextViewCopyBackgroundColor(textView, &prevColor);
	require_noerr( status, CantGetBackgroundColor );
	
	newColor = CGColorCreateCopyWithAlpha(prevColor, alpha);
	require( (newColor != NULL), CantCreateNewColor );
	
	status = HITextViewSetBackgroundColor(textView, newColor);
	check_noerr( status );

	CGColorRelease(newColor);
CantCreateNewColor:
	CGColorRelease(prevColor);
CantGetBackgroundColor:
	return status;
}