src/hbcore/gui/hbcontentwidget.cpp
author hgs
Mon, 18 Oct 2010 18:23:13 +0300
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parent 7 923ff622b8b9
permissions -rw-r--r--
201041
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbCore module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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#include "hbcontentwidget_p.h"
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#include "hbmainwindow.h"
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#include "hbmainwindow_p.h"
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#include "hbview.h"
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#include "hbeffectinternal_p.h"
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#include "hbwidgetfeedback.h"
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#include "hbscreen_p.h"
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#include "hbscreenshotitem_p.h"
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#include <QEvent>
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#include <QGraphicsSceneMouseEvent>
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/*!
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  \class HbContentWidget
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  \brief Container for views in a mainwindow. Extends HbStackedWidget with view
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  switch effects and other features.
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  \internal
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*/
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// An internal view switch flag, it is used to indicate the type of
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// the effect (show/hide) to getEffectTarget.
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const int Hiding = 0x1000000;
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HbContentWidget::HbContentWidget(HbMainWindow *mainWindow, QGraphicsItem *parent /*= 0*/):
0
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    HbStackedWidget(parent),
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    mViewSwitchRunning(false),
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    mTargetView(0),
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    mHidingView(0),
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    mMainWindow(mainWindow)
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{
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    // Do not defer this, it causes invalidation and updating.
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    setFocusPolicy(Qt::StrongFocus);
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    setAcceptTouchEvents(true);
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}
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QSizeF HbContentWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
2
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    Q_UNUSED(constraint);
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    QSizeF size;
2
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0
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    switch (which) {
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    case Qt::MinimumSize:
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        size = QSizeF(0, 0);
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        break;
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    case Qt::PreferredSize: {
0
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        HbDeviceProfile profile(HbDeviceProfile::profile(this));
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        size = profile.logicalSize();
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        if (!size.isValid()) {
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            size = QSizeF(1000, 1000);
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        }
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    }
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    break;
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    case Qt::MaximumSize:
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    default:
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        size = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
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        break;
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    }
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0
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    return size;
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}
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void HbContentWidget::setTargetView(HbView *view)
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{
2
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    mTargetView = view;
0
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}
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QString HbContentWidget::getEffectEvent(const char *baseName,
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                                        Hb::ViewSwitchFlags flags,
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                                        HbView *viewFrom,
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                                        HbView *viewTo)
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{
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    QString event(baseName);
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    if (flags & Hb::ViewSwitchUseAltEvent) {
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        event.append(QLatin1String("_alt"));
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    }
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    bool backAnim = false;
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    if (flags & Hb::ViewSwitchUseBackAnim) {
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        backAnim = true;
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    } else if (!(flags & Hb::ViewSwitchUseNormalAnim)) {
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        // No view switch direction is explicitly specified, try to
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        // guess from the context of the view switch, that is, the
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        // ordering between the source and destination views (as there
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        // is no other information available to us here).
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        int fromIndex = indexOf(viewFrom);
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        int toIndex = indexOf(viewTo);
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        // If to > from use the baseName as it is (NormalAnim).
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        // Otherwise add the suffix (BackAnim).
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        if (toIndex < fromIndex) {
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            backAnim = true;
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        }
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    }
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    if (backAnim) {
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        event.append(QLatin1String("_back"));
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    }
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    return event;
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}
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   127
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QGraphicsWidget *HbContentWidget::getEffectTarget(HbView *view, Hb::ViewSwitchFlags flags)
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{
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    // View switch effects ("show" and "hide") are always registered
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    // for the HbView instance (not for its content widget). However
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    // the graphics item to be animated may be something different
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    // (the content widget, the "screen" item, etc.) so use the
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    // special start() version from HbEffectInternal. Also, some views
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    // may not have a content widget, in this case use the HbView as
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    // the effect target.
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    QGraphicsWidget *viewWidget = view->widget();
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    QGraphicsWidget *effectTarget = viewWidget ? viewWidget : view;
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    HbMainWindowPrivate *mwd = HbMainWindowPrivate::d_ptr(mMainWindow);
0
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    if (flags & Hb::ViewSwitchFullScreen) {
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        effectTarget = mwd->mClippingItem;
0
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        if (!(flags & Hb::ViewSwitchSequential)) {
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            // The Parallel+FullScreen combination does not make sense
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            // (e.g. cannot animate the one and only titlebar
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            // concurrently).
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            qWarning("HbMainWindow: parallel fullscreen view switch is not supported");
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            effectTarget = 0;
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        }
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    } else if (flags & Hb::ViewSwitchCachedFullScreen) {
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        // This version supports sequential effects too, but in the
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        // hiding case the effect must run on the special graphics
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        // item that will show a screenshot of the mainwindow.
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        if (flags & Hiding) {
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            effectTarget = mwd->screenshotItem();
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   155
        } else {
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            effectTarget = mwd->mClippingItem;
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        }
0
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    }
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    return effectTarget;
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}
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/*!
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  Callback for 'hide' effect.
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*/
0
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void HbContentWidget::hideEffectFinished(HbEffect::EffectStatus status)
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{
1
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    // Make sure the old view is hidden. The effect does this too due to
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    // HideRegItemBeforeClearingEffect so no matter which comes first (clearing
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    // of the effect or this notification), the item is hidden properly before
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    // resetting the transform etc. and thus there is no flicker.
2
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    mHidingView->setVisible(false);
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    if (mViewSwitchFlags & Hb::ViewSwitchCachedFullScreen) {
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        HbMainWindowPrivate *mwd = HbMainWindowPrivate::d_ptr(mMainWindow);
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        mwd->screenshotItem()->releaseAndHide();
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        if (mViewSwitchFlags & Hb::ViewSwitchSequential) {
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            mwd->mClippingItem->show();
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        }
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    }
1
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    // Start the "show" phase if not yet started.
2
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    if (mViewSwitchFlags & Hb::ViewSwitchSequential) {
1
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        // Do not show targetView yet, leave it to the effect in order to
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        // prevent flickering.
0
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        if (status.reason != Hb::EffectCancelled) {
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            runViewSwitchEffectShow();
1
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        } else {
2
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            mTargetView->setVisible(true);
1
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            viewSwitchEffectsFinished(status);
0
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        }
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    }
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}
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1
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/*!
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  Callback for 'show' effect.
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*/
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void HbContentWidget::viewSwitchEffectsFinished(HbEffect::EffectStatus status)
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{
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    Q_UNUSED(status);
1
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    // Do not bother with item visibility here, the effect should manage it
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    // properly because the ShowItemOnFirstUpdate flag was set.
2
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    mViewSwitchRunning = false;
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    mMainWindow->setInteractive(true); // enable input events
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    if (HbMainWindowPrivate::d_ptr(mMainWindow)->mDelayedConstructionHandled) {
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        HbMainWindowPrivate::d_ptr(mMainWindow)->_q_viewReady();
1
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    }
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}
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/*!
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  Starts the "hide" effect (the first phase of a view switch animation).
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*/
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void HbContentWidget::runViewSwitchEffectHide(HbView *viewToHide, Hb::ViewSwitchFlags flags)
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{
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    // Cancel all on-going effects. Relying on the cancel() calls made by the
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    // start() functions would not be enough in all situations.
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    HbEffectInternal::cancelAll(0, true); // ignore looping effects, those are not view switch effects and must not be stopped here
2
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    mViewSwitchRunning = true;
0
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   216
34
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   217
    bool hideOld = false;
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   218
    if (flags & Hb::ViewSwitchCachedFullScreen) {
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   219
        // Take a screenshot (must be done before touching anything in the view
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   220
        // stack) and show it. The screenshot will effectively replace the
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        // hiding view.
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   222
        HbMainWindowPrivate::d_ptr(mMainWindow)->screenshotItem()->takeAndShowScreenshot();
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   223
        hideOld = true;
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   224
    }
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   225
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   226
    // Make the new view the current one right away. This must be done asap to
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   227
    // prevent messed up state in mainwindow, the stack widget, etc. due to
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   228
    // events coming during the view switch animation.
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   229
    //
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   230
    // 2nd param (hideOld): We still want to see the old view (normally
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   231
    // setCurrentWidget would hide it), except in the cached case.
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   232
    //
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   233
    // 3rd param (showNew): The new view is not yet needed (the effect will take
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   234
    // care of making it visible).
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   235
    setCurrentWidget(mTargetView, hideOld, false);
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diff changeset
   236
2
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    mHidingView = viewToHide;
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    mViewSwitchFlags = flags;
0
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   239
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    QGraphicsWidget *effectTarget = getEffectTarget(viewToHide, (Hb::ViewSwitchFlags) (flags | Hiding));
0
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    if (effectTarget) {
2
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        mMainWindow->setInteractive(false); // disable input while the effects are running
34
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   243
        if ((flags & Hb::ViewSwitchCachedFullScreen) && (flags & Hb::ViewSwitchSequential)) {
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   244
            // Get rid of decorators for the duration of the hide effect
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   245
            // otherwise they would show up under the screenshot item when
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   246
            // it disappears.
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   247
            HbMainWindowPrivate::d_ptr(mMainWindow)->mClippingItem->hide();
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   248
        }
2
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        QString event = getEffectEvent("hide", flags, viewToHide, mTargetView);
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        HbEffectInternal::EffectFlags effectFlags =
1
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            HbEffectInternal::ClearEffectWhenFinished // the effect must not be persistent
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            | HbEffectInternal::HideRegItemBeforeClearingEffect; // to prevent unlikely, but possible flicker
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        HbEffectInternal::start(viewToHide, effectTarget, effectFlags,
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                                "HB_view", event, this, "hideEffectFinished");
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        if (!(flags & Hb::ViewSwitchSequential)) {
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            runViewSwitchEffectShow();
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        }
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    }
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}
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/*!
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  Starts the "show" effect. Must only be called from runViewSwitchEffectHide() or from
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  the effect callback.
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*/
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void HbContentWidget::runViewSwitchEffectShow()
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{
2
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    QGraphicsWidget *effectTarget = getEffectTarget(mTargetView, mViewSwitchFlags);
0
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    if (effectTarget) {
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        QString event = getEffectEvent("show", mViewSwitchFlags, mHidingView, mTargetView);
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        HbEffectInternal::EffectFlags effectFlags =
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            HbEffectInternal::ClearEffectWhenFinished
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            | HbEffectInternal::ShowItemOnFirstUpdate; // because targetView is not yet visible
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        HbEffectInternal::start(mTargetView, effectTarget, effectFlags,
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                                "HB_view", event, this, "viewSwitchEffectsFinished");
0
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    }
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}
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void HbContentWidget::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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    event->accept();
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}
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bool HbContentWidget::event(QEvent *event)
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{
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    if (event->type() == QEvent::Polish) {
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        // No need for any real polishing.
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        static_cast<HbWidgetPrivate *>(d_ptr)->polished = true;
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        return true;
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    } else if (event->type() == QEvent::TouchBegin) {
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        // Accept all touch begin events to get the full Begin..End sequence
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        event->accept();
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        return true;
0
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    }
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0
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    return HbWidget::event(event);
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}