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/**
* @file llloadingindicator.cpp
* @brief Perpetual loading indicator
*
* $LicenseInfo:firstyear=2010&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llloadingindicator.h"
// Linden library includes
#include "llsingleton.h"
// Project includes
#include "lluictrlfactory.h"
#include "lluiimage.h"
// registered in llui.cpp to avoid being left out by MS linker
//static LLDefaultChildRegistry::Register<LLLoadingIndicator> r("loading_indicator");
///////////////////////////////////////////////////////////////////////////////
// LLLoadingIndicator::Data class
///////////////////////////////////////////////////////////////////////////////
/**
* Pre-loaded images shared by all instances of the widget
*/
class LLLoadingIndicator::Data: public LLSingleton<LLLoadingIndicator::Data>
{
public:
/*virtual*/ void initSingleton(); // from LLSingleton
LLPointer<LLUIImage> getNextImage(S8& idx) const;
U8 getImagesCount() const { return NIMAGES; }
private:
static const U8 NIMAGES = 12;
LLPointer<LLUIImage> mImages[NIMAGES];
};
// virtual
// Called right after the instance gets constructed.
void LLLoadingIndicator::Data::initSingleton()
{
// Load images.
for (U8 i = 0; i < NIMAGES; ++i)
{
std::string img_name = llformat("Progress_%d", i+1);
mImages[i] = LLUI::getUIImage(img_name, 0);
llassert(mImages[i]);
}
}
LLPointer<LLUIImage> LLLoadingIndicator::Data::getNextImage(S8& idx) const
{
// Calculate next index, performing array bounds checking.
idx = (idx >= NIMAGES || idx < 0) ? 0 : (idx + 1) % NIMAGES;
return mImages[idx];
}
///////////////////////////////////////////////////////////////////////////////
// LLLoadingIndicator class
///////////////////////////////////////////////////////////////////////////////
LLLoadingIndicator::LLLoadingIndicator(const Params& p)
: LLUICtrl(p)
, mRotationsPerSec(p.rotations_per_sec > 0 ? p.rotations_per_sec : 1.0f)
, mCurImageIdx(-1)
{
// Select initial image.
mCurImagep = Data::instance().getNextImage(mCurImageIdx);
// Start timer for switching images.
start();
}
void LLLoadingIndicator::draw()
{
// Time to switch to the next image?
if (mImageSwitchTimer.getStarted() && mImageSwitchTimer.hasExpired())
{
// Switch to the next image.
mCurImagep = Data::instance().getNextImage(mCurImageIdx);
// Restart timer.
start();
}
// Draw current image.
if( mCurImagep.notNull() )
{
mCurImagep->draw(getLocalRect(), LLColor4::white % getDrawContext().mAlpha);
}
LLUICtrl::draw();
}
void LLLoadingIndicator::stop()
{
mImageSwitchTimer.stop();
}
void LLLoadingIndicator::start()
{
mImageSwitchTimer.start();
F32 period = 1.0f / (Data::instance().getImagesCount() * mRotationsPerSec);
mImageSwitchTimer.setTimerExpirySec(period);
}
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