129 lines
3.6 KiB
C++
129 lines
3.6 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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* $LicenseInfo:firstyear=2010&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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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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