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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#pragma once
#include <sal/types.h>
namespace basegfx
{
class B2DHomMatrix;
class B2DRange;
}
/* Definition of Action interface */
namespace cppcanvas
{
namespace internal
{
/** Interface for internal render actions
This interface is implemented by all objects generated
from the metafile renderer, and corresponds roughly to the
VCL meta action.
*/
class Action
{
public:
/** Used for rendering action subsets
There are several cases where an Action might have
subsettable content, e.g. text, or referenced
metafiles, like the transparent action.
Generally, at the metafile renderer, all actions are
'flattened' out, i.e. a meta action rendering the
string "Hello" counts five indices, and a transparent
action containing a metafile with 100 actions counts
at least 100 indices (contained transparency or text
actions recursively add to this value). From the
outside, the subset to render is referenced via this
flat index range
*/
struct Subset
{
/** Denotes start of the subset.
The index given here specifies the first subaction
to render.
*/
sal_Int32 mnSubsetBegin;
/** Denotes end of the subset
The index given here specifies the first subaction
<em>not<em> to render, i.e. one action behind the
subset to be rendered
*/
sal_Int32 mnSubsetEnd;
};
virtual ~Action() {}
/** Render this action to the associated canvas
@param rTransformation
Transformation matrix to apply before rendering
@return true, if rendering was successful. If
rendering failed, false is returned.
*/
virtual bool render( const ::basegfx::B2DHomMatrix& rTransformation ) const = 0;
/** Render the given part of the action to the associated
canvas.
@param rTransformation
Transformation matrix to apply before rendering
@param rSubset
Subset of the action to render. See Subset description
for index semantics.
@return true, if rendering was successful. If the
specified subset is invalid for this action, or if
rendering failed for other reasons, false is returned.
*/
virtual bool renderSubset( const ::basegfx::B2DHomMatrix& rTransformation,
const Subset& rSubset ) const = 0;
/** Query bounds of this action on the associated canvas
@param rTransformation
Transformation matrix to apply
@return the bounds for this action in device
coordinate space.
*/
virtual ::basegfx::B2DRange getBounds( const ::basegfx::B2DHomMatrix& rTransformation ) const = 0;
/** Query bounds for the given part of the action on the
associated canvas.
@param rTransformation
Transformation matrix to apply.
@param rSubset
Subset of the action to query. See Subset description
for index semantics.
@return the bounds for the given subset in device
coordinate space.
*/
virtual ::basegfx::B2DRange getBounds( const ::basegfx::B2DHomMatrix& rTransformation,
const Subset& rSubset ) const = 0;
/** Query action count.
This method returns the number of subset actions
contained in this action. The render( Subset ) method
must accept subset ranges up to the value returned
here.
@return the number of subset actions
*/
virtual sal_Int32 getActionCount() const = 0;
};
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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