textrendering/textformatting/inc/InlineText.h
changeset 0 1fb32624e06b
child 5 e96e8a131979
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/textrendering/textformatting/inc/InlineText.h	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,92 @@
+/*
+* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+
+#ifndef INLINETEXT_H_
+#define INLINETEXT_H_
+
+#include <tagma.h>
+#include <InlineText_Internal.h>
+
+
+/**
+Class used to provide custom formatting functionality within Form
+as an extended interface (via the GetExtendedInterface mechanism
+supplied in MTmSource). Basically allows inline text insertion,
+that is, insertion of non-backing store text into the CTmTextLayout 
+formatting data used when drawing to the graphics device.
+
+Implementors of derived classes need to ensure that, in addition
+to anything else it does, their overload of GetExtendedInterface
+reacts to being prompted with the UID KInlineTextApiExtensionUid
+by returning their class cast as an MTmInlineTextSource. It should
+also invoke GetExtendedInterface on its other parent for any
+unrecognised UIDs.
+
+@publishedPartner
+@released
+@see MTmSource::GetExtendedInterface
+@see MFormCustomInterfaceProvider
+*/
+class MTmInlineTextSource
+	{
+public:
+	/**
+	Reports the next position into which inline text should be inserted
+	@param aFrom
+		The document position and character edge to start from.
+	@param aMaxLength
+		The maximum length within which to report inline text.
+		It means that inline text at position X should be reported if
+		aFrom <= X && X < aFrom + aMaxLength.
+		Also report trailing inline text at position aFrom + aMaxLength
+		because it is really attached to the preceding character.
+		Always report only the first inline text position >= aFrom.
+	@param aNext
+		On exit the position of the next bit of inline text to be inserted.
+		N.B. The position of trailing text following position N and the 
+		position of leading text preceding position N+1 are both 
+		considered to be N+1 - and the trailing text comes first so if
+		aFrom specifies a leading edge do not report trailing edge
+		inline text unless its position is greater than aFrom.
+		A panic EBadReturnValue will result otherwise.
+	@return
+		KErrNone if a position is found within the specified range,
+		KErrNotFound otherwise.
+	@post
+		if KErrNone returned then aFrom <= aNext
+		&& GetInlineText(aNext).Length() != 0
+		&& (GetInlineText(X).Length() == 0 for all
+		TTmDocPos X such that aFrom < X && X < aNext)
+		else if KErrNotFound returned
+		GetInlineText(X).Length() == 0 for all
+		TTmDocPos X such that aFrom <= X && X < aFrom + aMaxLength
+	*/
+	virtual TInt GetNextInlineTextPosition(const TTmDocPos& aFrom, TInt aMaxLength, TTmDocPos& aNext) = 0;
+
+	/**
+	Gets a view of the text to be inserted at aAt.
+	@param aAt
+		Document position, including character edge, being queried.
+	@return
+		Any inline text that should be attached to the specified character edge at aAt.
+	*/
+	virtual TPtrC GetInlineText(const TTmDocPos& aAt) = 0;
+	};
+
+#endif	// INLINETEXT_H_
+