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| -rw-r--r-- | canvas/inc/base/bufferedgraphicdevicebase.hxx | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/canvas/inc/base/bufferedgraphicdevicebase.hxx b/canvas/inc/base/bufferedgraphicdevicebase.hxx new file mode 100644 index 000000000..067d37a98 --- /dev/null +++ b/canvas/inc/base/bufferedgraphicdevicebase.hxx @@ -0,0 +1,258 @@ +/* -*- 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 <com/sun/star/awt/XWindow2.hpp> + +#include <canvas/canvastools.hxx> +#include <base/graphicdevicebase.hxx> + +namespace com::sun::star::awt { class XTopWindow; } + + +/* Definition of BufferedGraphicDeviceBase class */ + +namespace canvas +{ + /** Helper template base class for XGraphicDevice implementations + on windows. + + Use this base class if your target device is a + window. Additionally to GraphicDeviceBase, this template + provides an implementation of the awt::XWindowListener + interface, to receive notifications about state changes of the + associated window. + + @tpl Base + Base class to use, most probably one of the + WeakComponentImplHelperN templates with the appropriate + interfaces. At least XGraphicDevice should be among them (why else + would you use this template, then?). Base class must have an + Base( const Mutex& ) constructor (like the + WeakComponentImplHelperN templates have). As the very least, + the base class must be derived from uno::XInterface, as some + error reporting mechanisms rely on that. + + @tpl DeviceHelper + Device helper implementation for the backend in question. This + object will be held as a member of this template class, and + basically gets forwarded all XGraphicDevice API calls that + could not be handled generically. + + @tpl Mutex + Lock strategy to use. Defaults to using the + BaseMutex-provided lock. Every time one of the methods is + entered, an object of type Mutex is created with m_aMutex as + the sole parameter, and destroyed again when the method scope + is left. + + @tpl UnambiguousBase + Optional unambiguous base class for XInterface of Base. It's + sometimes necessary to specify this parameter, e.g. if Base + derives from multiple UNO interface (were each provides its + own version of XInterface, making the conversion ambiguous) + */ + template< class Base, + class DeviceHelper, + class Mutex=::osl::MutexGuard, + class UnambiguousBase = css::uno::XInterface > class BufferedGraphicDeviceBase : + public GraphicDeviceBase< Base, DeviceHelper, Mutex, UnambiguousBase > + { + public: + typedef GraphicDeviceBase< Base, DeviceHelper, Mutex, UnambiguousBase > BaseType; + typedef Mutex MutexType; + + BufferedGraphicDeviceBase() : + mxWindow(), + maBounds(), + mbIsVisible( false ), + mbIsTopLevel( false ) + { + BaseType::maPropHelper.addProperties( + PropertySetHelper::MakeMap("Window", + [this] () { return this->getXWindow(); })); + } + + // XGraphicDevice + virtual css::uno::Reference< css::rendering::XBufferController > SAL_CALL getBufferController( ) override + { + return this; + } + + // XBufferController + virtual ::sal_Int32 SAL_CALL createBuffers( ::sal_Int32 nBuffers ) override + { + tools::verifyRange( nBuffers, sal_Int32(1) ); + + return 1; + } + + virtual void SAL_CALL destroyBuffers( ) override + { + } + + virtual sal_Bool SAL_CALL showBuffer( sal_Bool bUpdateAll ) override + { + MutexType aGuard( BaseType::m_aMutex ); + + return BaseType::maDeviceHelper.showBuffer( mbIsVisible, bUpdateAll ); + } + + virtual sal_Bool SAL_CALL switchBuffer( sal_Bool bUpdateAll ) override + { + MutexType aGuard( BaseType::m_aMutex ); + + return BaseType::maDeviceHelper.switchBuffer( mbIsVisible, bUpdateAll ); + } + + + /** Set corresponding canvas window + + Use this method to set the window this canvas displays + on. Comes in handy when the canvas needs to adapt size or + output position to the changing window. + + Whenever the bounds of the window change, <code>void + notifySizeUpdate( const awt::Rectangle& rBounds )</code> + is called, with rBounds the window bound rect relative to + the frame window. + */ + void setWindow( const css::uno::Reference< css::awt::XWindow2 >& rWindow ) + { + if( mxWindow.is() ) + mxWindow->removeWindowListener( this ); + + mxWindow = rWindow; + + if( mxWindow.is() ) + { + mbIsVisible = mxWindow->isVisible(); + mbIsTopLevel = + css::uno::Reference< css::awt::XTopWindow >( + mxWindow, + css::uno::UNO_QUERY ).is(); + + maBounds = transformBounds( mxWindow->getPosSize() ); + mxWindow->addWindowListener( this ); + } + } + + css::uno::Any getXWindow() const + { + return css::uno::makeAny(mxWindow); + } + + virtual void disposeThis() override + { + typename BaseType::MutexType aGuard( BaseType::m_aMutex ); + + if( mxWindow.is() ) + { + mxWindow->removeWindowListener(this); + mxWindow.clear(); + } + + // pass on to base class + BaseType::disposeThis(); + } + + css::awt::Rectangle transformBounds( const css::awt::Rectangle& rBounds ) + { + // notifySizeUpdate's bounds are relative to the toplevel + // window + if( !mbIsTopLevel ) + return tools::getAbsoluteWindowRect( + rBounds, + mxWindow ); + else + return css::awt::Rectangle( 0,0,rBounds.Width,rBounds.Height ); + } + + void boundsChanged( const css::awt::WindowEvent& e ) + { + typename BaseType::MutexType aGuard( BaseType::m_aMutex ); + + const css::awt::Rectangle& rNewBounds( + transformBounds( css::awt::Rectangle( e.X, + e.Y, + e.Width, + e.Height ))); + + if( rNewBounds.X != maBounds.X || + rNewBounds.Y != maBounds.Y || + rNewBounds.Width != maBounds.Width || + rNewBounds.Height != maBounds.Height ) + { + maBounds = rNewBounds; + BaseType::maDeviceHelper.notifySizeUpdate( maBounds ); + } + } + + // XWindowListener + virtual void disposeEventSource( const css::lang::EventObject& Source ) override + { + typename BaseType::MutexType aGuard( BaseType::m_aMutex ); + + if( Source.Source == mxWindow ) + mxWindow.clear(); + + BaseType::disposeEventSource(Source); + } + + virtual void SAL_CALL windowResized( const css::awt::WindowEvent& e ) override + { + boundsChanged( e ); + } + + virtual void SAL_CALL windowMoved( const css::awt::WindowEvent& e ) override + { + boundsChanged( e ); + } + + virtual void SAL_CALL windowShown( const css::lang::EventObject& ) override + { + typename BaseType::MutexType aGuard( BaseType::m_aMutex ); + + mbIsVisible = true; + } + + virtual void SAL_CALL windowHidden( const css::lang::EventObject& ) override + { + typename BaseType::MutexType aGuard( BaseType::m_aMutex ); + + mbIsVisible = false; + } + + protected: + css::uno::Reference< css::awt::XWindow2 > mxWindow; + + /// Current bounds of the owning Window + css::awt::Rectangle maBounds; + + /// True, if the window this canvas is contained in, is visible + bool mbIsVisible; + + private: + /// True, if the window this canvas is contained in, is a toplevel window + bool mbIsTopLevel; + }; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |