/**
 * @file llscreenchannel.cpp
 * @brief Class implements a channel on a screen in which appropriate toasts may appear.
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * 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 "llviewerprecompiledheaders.h" // must be first include

#include "lliconctrl.h"
#include "lltextbox.h"
#include "llscreenchannel.h"

#include "lltoastpanel.h"
#include "llviewercontrol.h"
#include "llviewerwindow.h"
#include "llfloaterreg.h"
#include "lltrans.h"
#include "llagent.h"
#include "lldockablefloater.h"
#include "llsyswellwindow.h"
#include "llfloaterimsession.h"
#include "llscriptfloater.h"
#include "llrootview.h"

#include <algorithm>

using namespace LLNotificationsUI;

bool LLScreenChannel::mWasStartUpToastShown = false;

LLRect LLScreenChannelBase::getChannelRect()
{
    LL_PROFILE_ZONE_SCOPED;

    if (mFloaterSnapRegion == NULL)
    {
        mFloaterSnapRegion = gViewerWindow->getRootView()->getChildView("floater_snap_region");
    }

    if (mChicletRegion == NULL)
    {
        mChicletRegion = gViewerWindow->getRootView()->getChildView("chiclet_container");
    }

    LLRect channel_rect;
    LLRect chiclet_rect;

    mFloaterSnapRegion->localRectToScreen(mFloaterSnapRegion->getLocalRect(), &channel_rect);
    mChicletRegion->localRectToScreen(mChicletRegion->getLocalRect(), &chiclet_rect);

    channel_rect.mTop = chiclet_rect.mBottom;
    return channel_rect;
}


//--------------------------------------------------------------------------
//////////////////////
// LLScreenChannelBase
//////////////////////

LLScreenChannelBase::LLScreenChannelBase(const Params& p)
:   LLUICtrl(p),
    mToastAlignment(p.toast_align),
    mCanStoreToasts(true),
    mHiddenToastsNum(0),
    mHoveredToast(NULL),
    mControlHovering(false),
    mShowToasts(true),
    mID(p.id),
    mDisplayToastsAlways(p.display_toasts_always),
    mChannelAlignment(p.channel_align),
    mFloaterSnapRegion(NULL),
    mChicletRegion(NULL)
{
    mID = p.id;

    setMouseOpaque( false );
    setVisible(false);
}

bool LLScreenChannelBase::postBuild()
{
    if (mFloaterSnapRegion == NULL)
    {
        mFloaterSnapRegion = gViewerWindow->getRootView()->getChildView("floater_snap_region");
    }

    if (mChicletRegion == NULL)
    {
        mChicletRegion = gViewerWindow->getRootView()->getChildView("chiclet_container");
    }

    return true;
}

void LLScreenChannelBase::reshape(S32 width, S32 height, bool called_from_parent)
{
    if (mChannelAlignment == CA_CENTRE)
    {
        // Keep notifications and alerts centered
        // WorldViewRectScaled is out of date at reshape but Window has same width
        S32 channel_bound = gViewerWindow->getWindowRectScaled().getWidth() / 2;
        setRect(LLRect(channel_bound, 0, channel_bound, 0));
        updateRect(); //sets top and bottom only
    }
    redrawToasts();
}

bool  LLScreenChannelBase::isHovering()
{
    if (!mHoveredToast)
    {
        return false;
    }

    return mHoveredToast->isHovered();
}

void LLScreenChannelBase::updatePositionAndSize(LLRect rect)
{
    LLRect this_rect = getRect();

    this_rect.mTop = rect.mTop;
    switch(mChannelAlignment)
    {
    case CA_LEFT :
        break;
    case CA_CENTRE :
        this_rect.setCenterAndSize( (rect.getWidth()) / 2, rect.getHeight() / 2, this_rect.getWidth(), this_rect.getHeight());
        break;
    case CA_RIGHT :
        this_rect.setLeftTopAndSize(rect.mRight - this_rect.getWidth(),
            this_rect.mTop,
            this_rect.getWidth(),
            this_rect.getHeight());
    }
    setRect(this_rect);
    redrawToasts();

}

void LLScreenChannelBase::init(S32 channel_left, S32 channel_right)
{
    // top and bottom set by updateRect()
    setRect(LLRect(channel_left, 0, channel_right, 0));
    updateRect();
    setVisible(true);
}

void    LLScreenChannelBase::updateRect()
{
    const S32 CHANNEL_BOTTOM_PANEL_MARGIN = 35;
    S32 channel_top = getChannelRect().mTop;
    S32 channel_bottom = getChannelRect().mBottom + CHANNEL_BOTTOM_PANEL_MARGIN;
    S32 channel_left = getRect().mLeft;
    S32 channel_right = getRect().mRight;
    setRect(LLRect(channel_left, channel_top, channel_right, channel_bottom));
}

//--------------------------------------------------------------------------
//////////////////////
// LLScreenChannel
//////////////////////
//--------------------------------------------------------------------------
LLScreenChannel::LLScreenChannel(const Params& p)
:   LLScreenChannelBase(p),
    mStartUpToastPanel(NULL)
{
}

//--------------------------------------------------------------------------
void LLScreenChannel::init(S32 channel_left, S32 channel_right)
{
    LLScreenChannelBase::init(channel_left, channel_right);
    LLRect channel_rect = getChannelRect();
    updatePositionAndSize(channel_rect);
}

//--------------------------------------------------------------------------
LLScreenChannel::~LLScreenChannel()
{

}

std::list<const LLToast*> LLScreenChannel::findToasts(const Matcher& matcher)
{
    std::list<const LLToast*> res;

    // collect stored toasts
    for (std::vector<ToastElem>::iterator it = mStoredToastList.begin(); it
            != mStoredToastList.end(); it++)
    {
        const LLToast* toast = it->getToast();
        if (toast && matcher.matches(toast->getNotification()))
        {
            res.push_back(toast);
        }
    }

    // collect displayed toasts
    for (std::vector<ToastElem>::iterator it = mToastList.begin(); it
            != mToastList.end(); it++)
    {
        const LLToast* toast = it->getToast();
        if (toast && matcher.matches(toast->getNotification()))
        {
            res.push_back(toast);
        }
    }

    return res;
}

//--------------------------------------------------------------------------
void LLScreenChannel::updatePositionAndSize(LLRect new_world_rect)
{
    LLRect this_rect = getRect();

    switch(mChannelAlignment)
    {
    case CA_LEFT :
        this_rect.mTop = (S32) (new_world_rect.getHeight() * getHeightRatio());
        break;
    case CA_CENTRE :
        LLScreenChannelBase::updatePositionAndSize(new_world_rect);
        return;
    case CA_RIGHT :
        this_rect.mTop = (S32) (new_world_rect.getHeight() * getHeightRatio());
        this_rect.setLeftTopAndSize(new_world_rect.mRight - this_rect.getWidth(),
            this_rect.mTop,
            this_rect.getWidth(),
            this_rect.getHeight());
    }
    setRect(this_rect);
    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::addToast(const LLToast::Params& p)
{
    LL_PROFILE_ZONE_SCOPED;
    bool store_toast = false, show_toast = false;

    if (mDisplayToastsAlways)
    {
        show_toast = true;
    }
    else
    {
        show_toast = mWasStartUpToastShown && (mShowToasts || p.force_show);
    }
    store_toast = !show_toast && p.can_be_stored && mCanStoreToasts;

    if(!show_toast && !store_toast)
    {
        if(gAgent.isDoNotDisturb())
        {
            return;
        }
        LLNotificationPtr notification = LLNotifications::instance().find(p.notif_id);

        if (notification &&
            (!notification->canLogToIM() || !notification->hasFormElements()))
        {
            // only cancel notification if it isn't being used in IM session
            LLNotifications::instance().cancel(notification);
        }

        // It was assumed that the toast would take ownership of the panel pointer.
        // But since we have decided not to display the toast, kill the panel to
        // prevent the memory leak.
        if (p.panel != NULL)
        {
            p.panel()->die();
        }
        return;
    }

    LLToast* toast = new LLToast(p);
    ToastElem new_toast_elem(toast->getHandle());

    toast->setOnFadeCallback(boost::bind(&LLScreenChannel::onToastFade, this, _1));
    toast->setOnToastDestroyedCallback(boost::bind(&LLScreenChannel::onToastDestroyed, this, _1));
    if(mControlHovering)
    {
        toast->setOnToastHoverCallback(boost::bind(&LLScreenChannel::onToastHover, this, _1, _2));
        toast->setMouseEnterCallback(boost::bind(&LLScreenChannel::stopToastTimer, this, toast));
        toast->setMouseLeaveCallback(boost::bind(&LLScreenChannel::startToastTimer, this, toast));
    }

    if(show_toast)
    {
        mToastList.push_back(new_toast_elem);
        if(p.can_be_stored)
        {
            // store toasts immediately - EXT-3762
            storeToast(new_toast_elem);
        }
        updateShowToastsState();
        redrawToasts();
    }
    else // store_toast
    {
        mHiddenToastsNum++;
        storeToast(new_toast_elem);
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::onToastDestroyed(LLToast* toast)
{
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), static_cast<LLPanel*>(toast));

    if(it != mToastList.end())
    {
        mToastList.erase(it);
    }

    it = find(mStoredToastList.begin(), mStoredToastList.end(), static_cast<LLPanel*>(toast));

    if(it != mStoredToastList.end())
    {
        mStoredToastList.erase(it);
    }

    // if destroyed toast is hovered - reset hovered
    if (mHoveredToast == toast)
    {
        mHoveredToast = NULL;
    }
}


//--------------------------------------------------------------------------
void LLScreenChannel::onToastFade(LLToast* toast)
{
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), static_cast<LLPanel*>(toast));

    if(it != mToastList.end())
    {
        bool delete_toast = !mCanStoreToasts || !toast->getCanBeStored();
        if(delete_toast)
        {
            mToastList.erase(it);
            deleteToast(toast);
        }
        else
        {
            storeToast((*it));
            mToastList.erase(it);
        }

        redrawToasts();
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::deleteToast(LLToast* toast)
{
    if (!toast || toast->isDead())
    {
        return;
    }

    // send signal to observers about destroying of a toast
    toast->closeToast();

    // update channel's Hovering state
    // turning hovering off manually because onMouseLeave won't happen if a toast was closed using a keyboard
    if(mHoveredToast == toast)
    {
        mHoveredToast  = NULL;
    }
}

//--------------------------------------------------------------------------

void LLScreenChannel::storeToast(ToastElem& toast_elem)
{
    // do not store clones
    std::vector<ToastElem>::iterator it = find(mStoredToastList.begin(), mStoredToastList.end(), toast_elem.getID());
    if( it != mStoredToastList.end() )
        return;

    const LLToast* toast = toast_elem.getToast();
    if (toast)
    {
    mStoredToastList.push_back(toast_elem);
        mOnStoreToast(toast->getPanel(), toast->getNotificationID());
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::loadStoredToastsToChannel()
{
    std::vector<ToastElem>::iterator it;

    if(mStoredToastList.size() == 0)
        return;

    for(it = mStoredToastList.begin(); it != mStoredToastList.end(); ++it)
    {
        LLToast* toast = it->getToast();
        if (toast)
        {
            toast->setIsHidden(false);
            toast->startTimer();
            mToastList.push_back(*it);
        }
    }

    mStoredToastList.clear();
    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::loadStoredToastByNotificationIDToChannel(LLUUID id)
{
    std::vector<ToastElem>::iterator it = find(mStoredToastList.begin(), mStoredToastList.end(), id);

    if( it == mStoredToastList.end() )
        return;

    LLToast* toast = it->getToast();
    if (toast)
    {
    if(toast->getVisible())
    {
        // toast is already in channel
        return;
    }

    toast->setIsHidden(false);
    toast->startTimer();
        mToastList.push_back(*it);
    }

    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::killToastByNotificationID(LLUUID id)
{
    // searching among toasts on a screen
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), id);
    LLNotificationPtr notification = LLNotifications::instance().find(id);
    if (!notification) return;

    if( it != mToastList.end())
    {
        LLToast* toast = it->getToast();
        // if it is a notification toast and notification is UnResponded - then respond on it
        // else - simply destroy a toast
        //
        // NOTE:    if a notification is unresponded this function will be called twice for the same toast.
        //          At first, the notification will be discarded, at second (it will be caused by discarding),
        //          the toast will be destroyed.
        if(toast && toast->isNotificationValid())
        {
            if (!notification->canLogToIM() || !notification->hasFormElements())
            {
                // only cancel notification if it isn't being used in IM session
                LLNotifications::instance().cancel(notification);
            }
        }
        else
        {
            removeToastByNotificationID(id);
        }
    }
    else
    {
        // searching among stored toasts
        it = find(mStoredToastList.begin(), mStoredToastList.end(), id);

        if( it != mStoredToastList.end() )
        {
            LLToast* toast = it->getToast();
            if (toast)
            {
                if (!notification->canLogToIM() || !notification->hasFormElements())
                {
                    // only cancel notification if it isn't being used in IM session
                    LLNotifications::instance().cancel(notification);
                }
                deleteToast(toast);
            }
        }

        // Call find() once more, because the mStoredToastList could have been changed
        // via notification cancellation and the iterator could have become invalid.
        it = find(mStoredToastList.begin(), mStoredToastList.end(), id);
        if (it != mStoredToastList.end())
        {
            mStoredToastList.erase(it);
        }
    }
}

void LLScreenChannel::removeToastByNotificationID(LLUUID id)
{
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), id);
    while( it != mToastList.end())
    {
        deleteToast(it->getToast());
        mToastList.erase(it);
        redrawToasts();
        // find next toast with matching id
        it = find(mToastList.begin(), mToastList.end(), id);
    }

    it = find(mStoredToastList.begin(), mStoredToastList.end(), id);
    if (it != mStoredToastList.end())
    {
        deleteToast(it->getToast());
        mStoredToastList.erase(it);
    }
}


void LLScreenChannel::killMatchedToasts(const Matcher& matcher)
{
    std::list<const LLToast*> to_delete = findToasts(matcher);
    for (std::list<const LLToast*>::iterator it = to_delete.begin(); it
            != to_delete.end(); it++)
    {
        killToastByNotificationID((*it)-> getNotificationID());
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::modifyToastByNotificationID(LLUUID id, LLPanel* panel)
{
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), id);

    LLPanel* panel_to_delete = panel;

    if( it != mToastList.end() && panel)
    {
        LLToast* toast = it->getToast();
        if (toast)
        {
            LLPanel* old_panel = toast->getPanel();
            toast->removeChild(old_panel);
            panel_to_delete = old_panel;
            toast->insertPanel(panel);
            toast->startTimer();
        }
        redrawToasts();
    }

    delete panel_to_delete;
}

//--------------------------------------------------------------------------
void LLScreenChannel::redrawToasts()
{
    if (!getParent())
    {
        // connect to floater snap region just to get resize events, we don't care about being a proper widget
        mFloaterSnapRegion->addChild(this);
        setFollows(FOLLOWS_ALL);
    }

    if(mToastList.size() == 0)
        return;

    switch(mToastAlignment)
    {
    case NA_TOP :
        showToastsTop();
        break;

    case NA_CENTRE :
        showToastsCentre();
        break;

    case NA_BOTTOM :
        showToastsBottom();
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::showToastsBottom()
{
    LLRect  toast_rect;
    S32     bottom = getRect().mBottom - gFloaterView->getRect().mBottom;
    S32     toast_margin = 0;
    std::vector<ToastElem>::reverse_iterator it;

    updateRect();

    LLDockableFloater* floater = dynamic_cast<LLDockableFloater*>(LLDockableFloater::getInstanceHandle().get());

    // Use a local variable instead of mToastList.
    // mToastList can be modified during recursive calls and then all iteratos will be invalidated.
    std::vector<ToastElem> vToastList( mToastList );

    for(it = vToastList.rbegin(); it != vToastList.rend(); ++it)
    {
        if(it != vToastList.rbegin())
        {
            LLToast* toast = (it-1)->getToast();
            if (!toast)
            {
                LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
                return;
            }

            bottom = toast->getRect().mTop - toast->getTopPad();
            toast_margin = gSavedSettings.getS32("ToastGap");
        }

        LLToast* toast = it->getToast();
        if(!toast)
        {
            LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
            return;
        }

        toast_rect = toast->getRect();
        toast_rect.setOriginAndSize(getRect().mRight - toast_rect.getWidth(),
                bottom + toast_margin, toast_rect.getWidth(),
                toast_rect.getHeight());
        toast->setRect(toast_rect);

        if(floater && floater->overlapsScreenChannel())
        {
            if(it == vToastList.rbegin())
            {
                // move first toast above docked floater
                S32 shift = floater->getRect().getHeight();
                if(floater->getDockControl())
                {
                    shift += floater->getDockControl()->getTongueHeight();
                }
                toast->translate(0, shift);
            }

            LLRect channel_rect = getChannelRect();
            // don't show toasts if there is not enough space
            if(toast_rect.mTop > channel_rect.mTop)
            {
                break;
            }
        }

        bool stop_showing_toasts = toast->getRect().mTop > getRect().mTop;

        if(!stop_showing_toasts)
        {
            if( it != vToastList.rend()-1)
            {
                S32 toast_top = toast->getRect().mTop + gSavedSettings.getS32("ToastGap");
                stop_showing_toasts = toast_top > getRect().mTop;
            }
        }

        // at least one toast should be visible

        if(it == vToastList.rbegin())
        {
            stop_showing_toasts = false;
        }

        if(stop_showing_toasts)
            break;

        if( !toast->getVisible() )
        {
            // HACK
            // EXT-2653: it is necessary to prevent overlapping for secondary showed toasts
            toast->setVisible(true);
        }
        if(!toast->hasFocus())
        {
            // Fixing Z-order of toasts (EXT-4862)
            // Next toast will be positioned under this one.
            gFloaterView->sendChildToBack(toast);
        }
    }

    // Dismiss toasts we don't have space for (STORM-391).
    if(it != vToastList.rend())
    {
        mHiddenToastsNum = 0;

        for(; it != vToastList.rend(); it++)
        {
            LLToast* toast = it->getToast();
            if (toast)
            {
                toast->hide();
            }
        }
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::showToastsCentre()
{
    LLToast* toast = mToastList[0].getToast();
    if (!toast)
    {
        LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
        return;
    }

    LLRect  toast_rect;
    S32     bottom = (getRect().mTop - getRect().mBottom)/2 + toast->getRect().getHeight()/2;
    std::vector<ToastElem>::reverse_iterator it;

    for(it = mToastList.rbegin(); it != mToastList.rend(); ++it)
    {
        LLToast* toast = it->getToast();
        if (!toast)
        {
            LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
            return;
        }

        toast_rect = toast->getRect();
        toast_rect.setLeftTopAndSize(getRect().mLeft - toast_rect.getWidth() / 2, bottom + toast_rect.getHeight() / 2 + gSavedSettings.getS32("ToastGap"), toast_rect.getWidth() ,toast_rect.getHeight());
        toast->setRect(toast_rect);

        toast->setVisible(true);
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::showToastsTop()
{
    LLRect channel_rect = getChannelRect();

    LLRect  toast_rect;
    S32     top = channel_rect.mTop;
    std::vector<ToastElem>::reverse_iterator it;

    updateRect();

    LLDockableFloater* floater = dynamic_cast<LLDockableFloater*>(LLDockableFloater::getInstanceHandle().get());

    // Use a local variable instead of mToastList.
    // mToastList can be modified during recursive calls and then all iteratos will be invalidated.
    std::vector<ToastElem> vToastList( mToastList );

    for(it = vToastList.rbegin(); it != vToastList.rend(); ++it)
    {
        if(it != vToastList.rbegin())
        {
            LLToast* toast = (it-1)->getToast();
            if (!toast)
            {
                LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
                return;
            }

            top = toast->getRect().mBottom - toast->getTopPad();
            gSavedSettings.getS32("ToastGap");
        }

        LLToast* toast = it->getToast();
        if (!toast)
        {
            LL_WARNS() << "Attempt to display a deleted toast." << LL_ENDL;
            return;
        }

        toast_rect = toast->getRect();
        toast_rect.setLeftTopAndSize(channel_rect.mRight - toast_rect.getWidth(),
            top, toast_rect.getWidth(),
            toast_rect.getHeight());
        toast->setRect(toast_rect);

        if(floater && floater->overlapsScreenChannel())
        {
            if(it == vToastList.rbegin())
            {
                // move first toast above docked floater
                S32 shift = -floater->getRect().getHeight();
                if(floater->getDockControl())
                {
                    shift -= floater->getDockControl()->getTongueHeight();
                }
                toast->translate(0, shift);
            }

            LLRect channel_rect = getChannelRect();
            // don't show toasts if there is not enough space
            if(toast_rect.mBottom < channel_rect.mBottom)
            {
                break;
            }
        }

        bool stop_showing_toasts = toast->getRect().mBottom < channel_rect.mBottom;

        if(!stop_showing_toasts)
        {
            if( it != vToastList.rend()-1)
            {
                S32 toast_bottom = toast->getRect().mBottom - gSavedSettings.getS32("ToastGap");
                stop_showing_toasts = toast_bottom < channel_rect.mBottom;
            }
        }

        // at least one toast should be visible
        if(it == vToastList.rbegin())
        {
            stop_showing_toasts = false;
        }

        if(stop_showing_toasts)
            break;

        if (!toast->getVisible())
        {
            // HACK
            // EXT-2653: it is necessary to prevent overlapping for secondary showed toasts
            toast->setVisible(true);
        }
        if (!toast->hasFocus())
        {
            // Fixing Z-order of toasts (EXT-4862)
            // Next toast will be positioned under this one.
            gFloaterView->sendChildToBack(toast);
        }
    }

    // Dismiss toasts we don't have space for (STORM-391).
    std::vector<LLToast*> toasts_to_hide;

    if(it != vToastList.rend())
    {
        mHiddenToastsNum = 0;

        for(; it != vToastList.rend(); it++)
        {
            LLToast* toast = it->getToast();
            if (toast)
            {
                toasts_to_hide.push_back(toast);
            }
        }
    }

    for (std::vector<LLToast*>::iterator it = toasts_to_hide.begin(), end_it = toasts_to_hide.end();
        it != end_it;
        ++it)
    {
        (*it)->hide();
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::createStartUpToast(S32 notif_num, F32 timer)
{
    LLScreenChannelBase::updateRect();

    LLRect toast_rect;
    LLToast::Params p;
    p.lifetime_secs = timer;
    p.enable_hide_btn = false;
    mStartUpToastPanel = new LLToast(p);

    if(!mStartUpToastPanel)
        return;

    mStartUpToastPanel->setOnFadeCallback(boost::bind(&LLScreenChannel::onStartUpToastHide, this));

    LLPanel* wrapper_panel = mStartUpToastPanel->getChild<LLPanel>("wrapper_panel");
    LLTextBox* text_box = mStartUpToastPanel->getChild<LLTextBox>("toast_text");

    std::string text = LLTrans::getString("StartUpNotifications");

    toast_rect = mStartUpToastPanel->getRect();
    mStartUpToastPanel->reshape(getRect().getWidth(), toast_rect.getHeight(), true);

    text_box->setValue(text);
    text_box->setVisible(true);

    text_box->reshapeToFitText();
    text_box->setOrigin(text_box->getRect().mLeft, (wrapper_panel->getRect().getHeight() - text_box->getRect().getHeight())/2);

    toast_rect.setLeftTopAndSize(0, getRect().getHeight() - gSavedSettings.getS32("ToastGap"), getRect().getWidth(), toast_rect.getHeight());
    mStartUpToastPanel->setRect(toast_rect);

    addChild(mStartUpToastPanel);

    mStartUpToastPanel->setVisible(true);
}

// static --------------------------------------------------------------------------
F32 LLScreenChannel::getHeightRatio()
{
    F32 ratio = gSavedSettings.getF32("NotificationChannelHeightRatio");
    if(0.0f > ratio)
    {
        ratio = 0.0f;
    }
    else if(1.0f < ratio)
    {
        ratio = 1.0f;
    }
    return ratio;
}

//--------------------------------------------------------------------------
void LLScreenChannel::updateStartUpString(S32 num)
{
    // *TODO: update string if notifications are arriving while the StartUp toast is on a screen
}

//--------------------------------------------------------------------------
void LLScreenChannel::onStartUpToastHide()
{
    onCommit();
}

//--------------------------------------------------------------------------
void LLScreenChannel::closeStartUpToast()
{
    if(mStartUpToastPanel != NULL)
    {
        mStartUpToastPanel->setVisible(false);
        mStartUpToastPanel = NULL;
    }
}

void LLNotificationsUI::LLScreenChannel::stopToastTimer(LLToast* toast)
{
    if (!toast || toast != mHoveredToast) return;

    // Pause fade timer of the hovered toast.
    toast->stopTimer();
}

void LLNotificationsUI::LLScreenChannel::startToastTimer(LLToast* toast)
{
    if (!toast || toast == mHoveredToast)
    {
        return;
    }

    // Reset its fade timer.
    toast->startTimer();
}

//--------------------------------------------------------------------------
void LLScreenChannel::hideToastsFromScreen()
{
    for(std::vector<ToastElem>::iterator it = mToastList.begin(); it != mToastList.end(); it++)
    {
        LLToast* toast = it->getToast();
        if (toast)
        {
            toast->setVisible(false);
        }
        else
        {
            LL_WARNS() << "Attempt to hide a deleted toast." << LL_ENDL;
        }
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::hideToast(const LLUUID& notification_id)
{
    std::vector<ToastElem>::iterator it = find(mToastList.begin(), mToastList.end(), notification_id);
    if(mToastList.end() != it)
    {
        LLToast* toast = it->getToast();
        if (toast)
        {
            toast->hide();
        }
        else
        {
            LL_WARNS() << "Attempt to hide a deleted toast." << LL_ENDL;
        }
    }
}

void LLScreenChannel::closeHiddenToasts(const Matcher& matcher)
{
    // since we can't guarantee that close toast operation doesn't change mToastList
    // we collect matched toasts that should be closed into separate list
    std::list<LLToast*> toasts;
    for (std::vector<ToastElem>::iterator it = mToastList.begin(); it
            != mToastList.end(); it++)
    {
        LLToast* toast = it->getToast();
        // add to list valid toast that match to provided matcher criteria
        if (toast != NULL && !toast->isDead() && toast->getNotification() != NULL
                && !toast->getVisible() && matcher.matches(toast->getNotification()))
        {
            toasts.push_back(toast);
        }
    }

    // close collected toasts
    for (std::list<LLToast*>::iterator it = toasts.begin(); it
            != toasts.end(); it++)
    {
        LLToast* toast = *it;
        toast->closeFloater();
    }
}

//--------------------------------------------------------------------------
void LLScreenChannel::removeToastsFromChannel()
{
    hideToastsFromScreen();
    for(std::vector<ToastElem>::iterator it = mToastList.begin(); it != mToastList.end(); it++)
    {
        deleteToast(it->getToast());
    }
    mToastList.clear();
}

//--------------------------------------------------------------------------
void LLScreenChannel::removeAndStoreAllStorableToasts()
{
    if(mToastList.size() == 0)
        return;

    hideToastsFromScreen();
    for(std::vector<ToastElem>::iterator it = mToastList.begin(); it != mToastList.end();)
    {
        LLToast* toast = it->getToast();
        if(toast && toast->getCanBeStored())
        {
            storeToast(*it);
            it = mToastList.erase(it);
        }
        else
        {
            ++it;
        }
    }
    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::removeToastsBySessionID(LLUUID id)
{
    if(mToastList.size() == 0)
        return;

    hideToastsFromScreen();
    for(std::vector<ToastElem>::iterator it = mToastList.begin(); it != mToastList.end();)
    {
        LLToast* toast = it->getToast();
        if(toast && toast->getSessionID() == id)
        {
            deleteToast(toast);
            it = mToastList.erase(it);
        }
        else
        {
            ++it;
        }
    }
    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::onToastHover(LLToast* toast, bool mouse_enter)
{
    // because of LLViewerWindow::updateUI() that NOT ALWAYS calls onMouseEnter BEFORE onMouseLeave
    // we must check hovering directly to prevent incorrect setting for hovering in a channel
    if (mouse_enter)
    {
        if (toast->isHovered())
        {
            mHoveredToast = toast;
        }
    }
    else if (mHoveredToast != NULL)
    {
        if (!mHoveredToast->isHovered())
        {
            mHoveredToast = NULL;
        }
    }

    redrawToasts();
}

//--------------------------------------------------------------------------
void LLScreenChannel::updateShowToastsState()
{
    LLDockableFloater* floater = dynamic_cast<LLDockableFloater*>(LLDockableFloater::getInstanceHandle().get());

    if(!floater)
    {
        setShowToasts(true);
        return;
    }

    updateRect();
}

//--------------------------------------------------------------------------

LLToast* LLScreenChannel::getToastByNotificationID(LLUUID id)
{
    std::vector<ToastElem>::iterator it = find(mStoredToastList.begin(),
            mStoredToastList.end(), id);

    if (it == mStoredToastList.end())
        return NULL;

    return it->getToast();
}