135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
/**
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* @file llloadingindicator.cpp
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* @brief Perpetual loading indicator
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*
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* $LicenseInfo:firstyear=2010&license=viewergpl$
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*
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* Copyright (c) 2010, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "llloadingindicator.h"
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// Linden library includes
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#include "llsingleton.h"
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// Project includes
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#include "lluictrlfactory.h"
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#include "lluiimage.h"
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// registered in llui.cpp to avoid being left out by MS linker
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//static LLDefaultChildRegistry::Register<LLLoadingIndicator> r("loading_indicator");
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///////////////////////////////////////////////////////////////////////////////
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// LLLoadingIndicator::Data class
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Pre-loaded images shared by all instances of the widget
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*/
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class LLLoadingIndicator::Data: public LLSingleton<LLLoadingIndicator::Data>
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{
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public:
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/*virtual*/ void initSingleton(); // from LLSingleton
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LLPointer<LLUIImage> getNextImage(S8& idx) const;
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U8 getImagesCount() const { return NIMAGES; }
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private:
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static const U8 NIMAGES = 12;
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LLPointer<LLUIImage> mImages[NIMAGES];
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};
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// virtual
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// Called right after the instance gets constructed.
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void LLLoadingIndicator::Data::initSingleton()
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{
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// Load images.
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for (U8 i = 0; i < NIMAGES; ++i)
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{
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std::string img_name = llformat("Progress_%d", i+1);
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mImages[i] = LLUI::getUIImage(img_name, 0);
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llassert(mImages[i]);
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}
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}
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LLPointer<LLUIImage> LLLoadingIndicator::Data::getNextImage(S8& idx) const
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{
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// Calculate next index, performing array bounds checking.
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idx = (idx >= NIMAGES || idx < 0) ? 0 : (idx + 1) % NIMAGES;
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return mImages[idx];
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}
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///////////////////////////////////////////////////////////////////////////////
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// LLLoadingIndicator class
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///////////////////////////////////////////////////////////////////////////////
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LLLoadingIndicator::LLLoadingIndicator(const Params& p)
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: LLUICtrl(p)
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, mRotationsPerSec(p.rotations_per_sec > 0 ? p.rotations_per_sec : 1.0f)
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, mCurImageIdx(-1)
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{
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// Select initial image.
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mCurImagep = Data::instance().getNextImage(mCurImageIdx);
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// Start timer for switching images.
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start();
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}
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void LLLoadingIndicator::draw()
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{
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// Time to switch to the next image?
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if (mImageSwitchTimer.getStarted() && mImageSwitchTimer.hasExpired())
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{
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// Switch to the next image.
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mCurImagep = Data::instance().getNextImage(mCurImageIdx);
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// Restart timer.
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start();
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}
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// Draw current image.
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if( mCurImagep.notNull() )
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{
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mCurImagep->draw(getLocalRect(), LLColor4::white % getDrawContext().mAlpha);
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}
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LLUICtrl::draw();
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}
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void LLLoadingIndicator::stop()
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{
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mImageSwitchTimer.stop();
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}
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void LLLoadingIndicator::start()
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{
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mImageSwitchTimer.start();
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F32 period = 1.0f / (Data::instance().getImagesCount() * mRotationsPerSec);
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mImageSwitchTimer.setTimerExpirySec(period);
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}
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