camerauis/cameraxui/cxui/src/cxuisettingslider.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 14:51:30 +0300
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permissions -rw-r--r--
Revision: 201011 Kit: 201015
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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 "cxuisettingslider.h"
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#include "cxeengine.h"
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#include "cxesettings.h"
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#include "cxutils.h"
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CxuiSettingSlider::CxuiSettingSlider(QGraphicsItem *parent, CxeEngine *engine) :
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HbSlider(parent),
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mSettingId(),
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mEngine(engine),
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mSettings(NULL),
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mOriginalValue(0),
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mSliderScaleValue(1)
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{
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    connect(this, SIGNAL(valueChanged(int)), this, SLOT(handleValueChanged(int)));
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}
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/*!
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    Initialises slider according to SliderParams data
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*/
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void CxuiSettingSlider::init(CxUiSettings::SliderParams *data)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    // initialise engine side settings
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    if (mEngine) {
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        mSettings = &mEngine->settings();
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        CX_ASSERT_ALWAYS(mSettings);
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    }
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    // initialise data
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    if (data) {
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        // scale value is needed because slider doesn't show all ticks and
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        // labels correctly if step is something else than 1
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        int step = 1;
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        mSliderScaleValue = 1;
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        if (data->mStep != 0) {
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            mSliderScaleValue = step / data->mStep;
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        }
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        // scale min and max values as step has been set to 1
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        int minvalue = data->mRange.first * mSliderScaleValue;
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        int maxvalue = data->mRange.second * mSliderScaleValue;
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        CX_DEBUG(("Setting slider range [%d..%d]", minvalue, maxvalue));
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        setRange(minvalue,maxvalue);
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        setSingleStep(step);
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        setSnappingMode(HbSlider::MajorTickSnapping);
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        // don't show labels and tickmarks if there are no strings to be shown
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        if (!data->mSettingStrings.isEmpty()) {
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            setMajorTickLabels(data->mSettingStrings);
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            setMajorTickInterval(step);
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            setTickPosition(Hb::SliderTicksLeft);
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        } else {
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            setTickPosition(Hb::NoSliderTicks);
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        }
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        setSettingId(data->mSettingId);
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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}
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/*!
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    Returns settingId
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*/
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QString CxuiSettingSlider::settingId() const
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{
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    return mSettingId;
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}
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/*!
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    Sets the setting identification string. Setting id corresponds to specific setting
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    defined in cxenamespace.h. A value that corresponds the id is got from engine and
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    stored as original value. Also slider value is updated.
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*/
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void CxuiSettingSlider::setSettingId(const QString &id)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    mSettingId = id;
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    // once the settingid is set, we can get the current value for the slider from the engine
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    qreal value = 0;
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    int err = mSettings->get(mSettingId, value);
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    CX_DEBUG((("err: %d value: %d"),err,value));
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    // engine value has to be scaled when set to slider
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    setValue(value * mSliderScaleValue);
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    mOriginalValue = value;
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    CX_DEBUG_EXIT_FUNCTION();
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}
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/*!
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    This slot is called when slider's value is changed.
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    Value is stored to engine.
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*/
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void CxuiSettingSlider::handleValueChanged(int value)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    qreal realValue = 0.0;
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    if (mSliderScaleValue != 0) {
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        realValue = value / mSliderScaleValue;
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    }
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    CX_DEBUG(("id: %s", mSettingId.toAscii().data()));
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    CX_DEBUG(("changing value to: %f ", realValue));
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    // check added because when the slider is created (or ui appearance changed)
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    // handlevaluechanged function is called before the mSettingId is set
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    if (!mSettingId.isEmpty()){
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        mSettings->set(mSettingId, realValue);
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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}
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/*!
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    This slot should be called when slider is closed. Original value will always be given
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    to engine. Original value is the value that slider had when it was initialised unless
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    slider value is changed and handleSelectionAccepted() function is called before coming here
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*/
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void CxuiSettingSlider::handleClose()
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    setValue(mOriginalValue * mSliderScaleValue);
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    // value selected from slider not accepted, revert back
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    // the value to original value.
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    CX_DEBUG(("id: %s", mSettingId.toAscii().data()));
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    CX_DEBUG(("changing value back to original value: %f ", mOriginalValue));
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    // when the slider is created, handlevaluechanged function is
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    // called before the mSettingId is set
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    if (mSettings && !mSettingId.isEmpty()){
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        mSettings->set(mSettingId, mOriginalValue);
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    }
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    // clear settings id so that setting value doesn't get updated by accident
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    // when updating slider's ui appearance
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    mSettingId.clear();
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    CX_DEBUG_EXIT_FUNCTION();
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}
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/*!
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    Accepts the current selection.
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*/
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void CxuiSettingSlider::handleSelectionAccepted()
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{
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    CX_DEBUG_ENTER_FUNCTION();
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   172
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    // sets the curren slider value to be original value. mOriginal value
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    // is given to engine whenever handleClose() function is called
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    if (mSliderScaleValue != 0) {
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        mOriginalValue = value() / mSliderScaleValue;
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    }
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    emit selectionCommitted();
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    CX_DEBUG_EXIT_FUNCTION();
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}