homescreenapp/hsutils/src/hssnapline.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 00:07:25 +0300
changeset 96 458d8c8d9580
parent 85 35368b604b28
permissions -rw-r--r--
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include <QGraphicsOpacityEffect>
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#include <QPropertyAnimation>
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#include <hbcolorscheme.h>
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#include "hsapp_defs.h"
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#include "hssnapline.h"
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/*!
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    Constructor.
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    \a parent Owner.
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*/
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HsSnapLine::HsSnapLine(QGraphicsItem *parent)
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  : QGraphicsLineItem(parent),
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    mFadeInAnimation(0),
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    mFadeOutAnimation(0),
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    mOpacity(0.0),
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    mFadeInAnimationDuration(0),
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    mFadeOutAnimationDuration(0)
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{
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    QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect(this);
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    effect->setOpacity(0.0);
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    effect->setEnabled(false);
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    setGraphicsEffect(effect);
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    mFadeInAnimation = new QPropertyAnimation(graphicsEffect(), "opacity", this);
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    connect(mFadeInAnimation, SIGNAL(finished()), SLOT(fadeInAnimationFinished()));
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    mFadeOutAnimation = new QPropertyAnimation(graphicsEffect(), "opacity", this);
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    connect(mFadeOutAnimation, SIGNAL(finished()), SLOT(fadeOutAnimationFinished()));
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}
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/*!
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    Destructor.
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*/
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HsSnapLine::~HsSnapLine()
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{
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}
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/*!
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    Sets the configuration for the showing the snap line, it includes fade-in / fade-out timeout.
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*/
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void HsSnapLine::setConfiguration(const QVariantHash &configuration)
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{
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    bool canConvert = false;
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    //The following values should be in int, so the status received in canConvert is ignored
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    mFadeInAnimationDuration = configuration[Hs::snapLineFadeinDuration].toInt(&canConvert);
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    mFadeOutAnimationDuration = configuration[Hs::snapLineFadeoutDuration].toInt(&canConvert);
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}
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/*!
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    Show the snap line. fade-in animation is started on the line if the line is positioned at a different place.
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    Before starting the fade-in animation, the fade-out animation is stoped if it is running.
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*/
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void HsSnapLine::showLine(const QLineF &snapLine)
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{
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    QLineF displayLine = snapLine;
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    qreal angle = displayLine.angle();
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    if (qAbs(angle) == 0.0 || qAbs(angle) == 180.0) { //this is a horizontal line
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        //adding 1 is required below, as the line is 3 pixels wide and is translated by 1 point before displaying
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        if (displayLine.y1() != (line().y1()+1.0) ) { //this horizontal line is at new position horizontally
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            if (isFadeOutAnimationRunning()) { //if fade-out animation is running, stop it, animation is running at old position
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                stopFadeOutAnimation();
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            }
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            //start fade-in animation at new position.
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            startFadeInAnimation();
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        }
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        else { //this horizontal line is at the old position horizontally
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            if (isFadeOutAnimationRunning()) { //if fade-out animation is running, stop it, animation is running at old position
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                stopFadeOutAnimation();
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                //start fade-in animation at the old position
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                startFadeInAnimation();
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            }
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        }
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        displayLine.translate(0.0, -1.0);
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    }
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    if (qAbs(angle) == 90.0 || qAbs(angle) == 270.0) { //this is a vertical line
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        if (displayLine.x1() != (line().x1()+1)) { //this Vertical line is at different position vertically
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            if (isFadeOutAnimationRunning()) {
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                stopFadeOutAnimation();
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            }
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            startFadeInAnimation();
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        }
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        else {
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            if (isFadeOutAnimationRunning()) {
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                stopFadeOutAnimation();
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                startFadeInAnimation();
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            }
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        }
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        displayLine.translate(-1.0, 0.0);
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    }
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77
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    QLinearGradient gradient(displayLine.p1(), displayLine.p2());
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    gradient.setColorAt(0.0, Qt::white);
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    QColor snapLineColor = HbColorScheme::color("qtc_hs_snapguide");
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   113
    if (!snapLineColor.isValid()) {
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   114
        //if valid color is not loaded from the theme, the darkCyan color is used as a backup.color
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        snapLineColor = Qt::darkCyan;
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   116
    }
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    gradient.setColorAt(0.4, snapLineColor);
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    gradient.setColorAt(0.6, snapLineColor);
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    gradient.setColorAt(1.0, Qt::white);
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    QBrush brush(gradient);
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    QPen pen;
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    pen.setWidth(3);
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   123
    pen.setCapStyle(Qt::RoundCap);
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    pen.setBrush(brush);
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    setPen(pen);
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   126
61
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    setLine(displayLine);
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    show();
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}
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   130
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   131
/*!
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    Hide the snap line. Fade-out animation is started on the line to be hidden.
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   133
    If fade-in animation is running, it is stoped before starting the fade-out animation.
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*/
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   135
void HsSnapLine::hideLine()
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   136
{
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   137
    if (isFadeInAnimationRunning()) {
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        stopFadeInAnimation();
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   139
    }
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   140
    startFadeOutAnimation();
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}
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   142
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   143
/*!
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   144
    Start fade-in animation.
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   145
*/
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   146
void HsSnapLine::startFadeInAnimation()
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{
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    mFadeInAnimation->setStartValue(mOpacity);
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   149
    mFadeInAnimation->setEndValue(1.0);
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    mFadeInAnimation->setDuration(getFadeInDuration());
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   151
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   152
    graphicsEffect()->setEnabled(true);
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   153
    mFadeInAnimation->start();
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}
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   155
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   156
/*!
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   157
    Check if fade-in animation is running.
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   158
*/
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   159
bool HsSnapLine::isFadeInAnimationRunning() const
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{
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    return mFadeInAnimation->state() == QAbstractAnimation::Running;
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   162
}
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   163
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   164
/*!
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   165
    Stop the fade-in animation.
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   166
*/
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   167
void HsSnapLine::stopFadeInAnimation()
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   168
{
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   169
    mFadeInAnimation->stop();
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   170
    actionOnFadeInAnimationStop();
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   171
}
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   172
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   173
/*!
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   174
    SLOT called when fade-in animation is finished / reaches it's end.
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   175
*/
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   176
void HsSnapLine::fadeInAnimationFinished()
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   177
{
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   178
    actionOnFadeInAnimationStop();
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   179
}
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   180
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   181
/*!
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   182
    Action when fade-in animation stops running.
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   183
*/
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   184
void HsSnapLine::actionOnFadeInAnimationStop()
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   185
{
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   186
    mOpacity = mFadeInAnimation->currentValue().toDouble();
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   187
    graphicsEffect()->setEnabled(false);
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   188
}
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   189
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   190
/*!
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   191
    Start fade-out animation.
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   192
*/
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   193
void HsSnapLine::startFadeOutAnimation()
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   194
{
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   195
    mFadeOutAnimation->setStartValue(mOpacity);
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   196
    mFadeOutAnimation->setEndValue(0.0);
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   197
    mFadeOutAnimation->setDuration(getFadeOutDuration());
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   198
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   199
    graphicsEffect()->setEnabled(true);
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   200
    mFadeOutAnimation->start();
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   201
}
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diff changeset
   202
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   203
/*!
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   204
    Check if fade-out animation is running.
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   205
*/
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   206
bool HsSnapLine::isFadeOutAnimationRunning() const
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   207
{
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   208
    return mFadeOutAnimation->state() == QAbstractAnimation::Running;
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   209
}
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diff changeset
   210
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diff changeset
   211
/*!
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   212
    Stop the fade-out animation.
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   213
*/
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   214
void HsSnapLine::stopFadeOutAnimation()
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   215
{
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   216
    mFadeOutAnimation->stop();
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   217
    actionOnFadeOutAnimationStop();
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   218
}
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   219
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   220
/*!
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   221
    SLOT called when fade-out animation is finished / reaches it's end.
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   222
*/
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   223
void HsSnapLine::fadeOutAnimationFinished()
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{
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    actionOnFadeOutAnimationStop();
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}
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/*!
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    Action when fade-out animation stops running.
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*/
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void HsSnapLine::actionOnFadeOutAnimationStop()
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{
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    mOpacity = mFadeOutAnimation->currentValue().toDouble();
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    graphicsEffect()->setEnabled(false);
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    hide();
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    setLine(QLineF());
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}