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/**************************************************************
*
* 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*************************************************************/
#ifndef SD_SLIDESORTER_VIEW_FONT_PROVIDER_HXX
#define SD_SLIDESORTER_VIEW_FONT_PROVIDER_HXX
#include "tools/SdGlobalResourceContainer.hxx"
#include <boost/shared_ptr.hpp>
#include <vcl/mapmod.hxx>
class Font;
class OutputDevice;
class VclWindowEvent;
namespace sd { namespace slidesorter { namespace view {
/** This simple singleton class provides fonts that are scaled so that they
have a fixed height on the given device regardless of its map mode.
*/
class FontProvider
: public SdGlobalResource
{
public:
typedef ::boost::shared_ptr<Font> SharedFontPointer;
/** Return the single instance of this class. Throws a RuntimeException
when no instance can be created.
*/
static FontProvider& Instance (void);
/** Return a font that is scaled according to the current map mode of
the given device. Repeated calls with a device, not necessarily the
same device, with the same map mode will return the same font. The
first call with a different map mode will release the old font and
create a new one that is correctly scaled.
*/
SharedFontPointer GetFont (const OutputDevice& rDevice);
/** Call this method to tell an object to release its currently used
font. The next call to GetFont() will then create a new one.
Typically called after a DataChange event when for instance a system
font has been modified.
*/
void Invalidate (void);
private:
static FontProvider* mpInstance;
/** The font that was created by a previous call to GetFont(). It is
replaced by another one only when GetFont() is called with a device
with a different map mode or by a call to Invalidate().
*/
SharedFontPointer maFont;
/** The mape mode for which maFont was created.
*/
MapMode maMapMode;
FontProvider (void);
virtual ~FontProvider (void);
// Copy constructor is not implemented.
FontProvider (const FontProvider&);
// Assignment operator is not implemented.
FontProvider& operator= (const FontProvider&);
};
} } } // end of namespace ::sd::slidesorter::view
#endif
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