306 lines
9.1 KiB
C++
306 lines
9.1 KiB
C++
/*
|
|
* Copyright (C) 2015-2017 Jolla Ltd.
|
|
* Contact: Slava Monich <slava.monich@jolla.com>
|
|
*
|
|
* You may use this file under the terms of the BSD license as follows:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Jolla Ltd nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "BooksListWatcher.h"
|
|
|
|
#include "HarbourDebug.h"
|
|
|
|
#define LISTVIEW_CONTENT_X "contentX"
|
|
#define LISTVIEW_CONTENT_Y "contentY"
|
|
#define LISTVIEW_CONTENT_WIDTH "contentWidth"
|
|
#define LISTVIEW_CONTENT_HEIGHT "contentHeight"
|
|
#define LISTVIEW_INDEX_AT "indexAt"
|
|
#define LISTVIEW_POSITION_VIEW_AT_INDEX "positionViewAtIndex"
|
|
|
|
BooksListWatcher::BooksListWatcher(QObject* aParent) :
|
|
QObject(aParent),
|
|
iCurrentIndex(-1),
|
|
iContentX(0),
|
|
iContentY(0),
|
|
iListView(NULL),
|
|
iCenterMode(-1),
|
|
iPositionIsChanging(false),
|
|
iResizeTimer(new QTimer(this))
|
|
{
|
|
iResizeTimer->setSingleShot(true);
|
|
iResizeTimer->setInterval(0);
|
|
connect(iResizeTimer, SIGNAL(timeout()), SLOT(onResizeTimeout()));
|
|
}
|
|
|
|
void BooksListWatcher::setListView(QQuickItem* aView)
|
|
{
|
|
if (iListView != aView) {
|
|
const QSize oldSize(iSize);
|
|
if (iListView) iListView->disconnect(this);
|
|
iListView = aView;
|
|
iCenterMode = -1;
|
|
if (iListView) {
|
|
connect(iListView,
|
|
SIGNAL(widthChanged()),
|
|
SLOT(onWidthChanged()));
|
|
connect(iListView,
|
|
SIGNAL(heightChanged()),
|
|
SLOT(onHeightChanged()));
|
|
connect(iListView,
|
|
SIGNAL(contentXChanged()),
|
|
SLOT(onContentXChanged()));
|
|
connect(iListView,
|
|
SIGNAL(contentYChanged()),
|
|
SLOT(onContentYChanged()));
|
|
connect(iListView,
|
|
SIGNAL(contentWidthChanged()),
|
|
SLOT(onContentSizeChanged()));
|
|
connect(iListView,
|
|
SIGNAL(contentHeightChanged()),
|
|
SLOT(onContentSizeChanged()));
|
|
iContentX = contentX();
|
|
iContentY = contentY();
|
|
iSize = QSize(iListView->width(), iListView->height());
|
|
} else {
|
|
iContentX = iContentY = 0;
|
|
iSize = QSize(0,0);
|
|
}
|
|
Q_EMIT listViewChanged();
|
|
updateCurrentIndex();
|
|
if (oldSize != iSize) {
|
|
Q_EMIT sizeChanged();
|
|
}
|
|
if (oldSize.width() != iSize.width()) {
|
|
Q_EMIT widthChanged();
|
|
}
|
|
if (oldSize.height() != iSize.height()) {
|
|
Q_EMIT heightChanged();
|
|
}
|
|
}
|
|
}
|
|
|
|
qreal BooksListWatcher::getRealProperty(const char *name, qreal defaultValue)
|
|
{
|
|
QVariant value = iListView->property(name);
|
|
bool ok = false;
|
|
if (value.isValid()) {
|
|
ok = false;
|
|
qreal r = value.toReal(&ok);
|
|
if (ok) return r;
|
|
}
|
|
return defaultValue;
|
|
}
|
|
|
|
void BooksListWatcher::positionViewAtIndex(int aIndex)
|
|
{
|
|
if (iListView) {
|
|
HDEBUG(aIndex);
|
|
doPositionViewAtIndex(aIndex);
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::doPositionViewAtIndex(int aIndex)
|
|
{
|
|
if (iCenterMode < 0) {
|
|
bool ok = false;
|
|
const QMetaObject* metaObject = iListView->metaObject();
|
|
if (metaObject) {
|
|
int index = metaObject->indexOfEnumerator("PositionMode");
|
|
if (index >= 0) {
|
|
QMetaEnum metaEnum = metaObject->enumerator(index);
|
|
int value = metaEnum.keyToValue("Center", &ok);
|
|
if (ok) {
|
|
iCenterMode = value;
|
|
HDEBUG("Center =" << iCenterMode);
|
|
}
|
|
}
|
|
}
|
|
HASSERT(ok);
|
|
if (!ok) {
|
|
// This is what it normally is
|
|
iCenterMode = 1;
|
|
}
|
|
}
|
|
iPositionIsChanging = true;
|
|
positionViewAtIndex(aIndex, iCenterMode);
|
|
// This is probably a bug in QQuickListView - it first calculates
|
|
// the item position and then starts instantiating the delegates.
|
|
// If there are no delegates yet, then the average item size is zero
|
|
// and the resulting item position will always turn out to be zero.
|
|
// So if we are trying to position the list at a non-zero index and
|
|
// instead we got positioned at zero, try it again.
|
|
if (aIndex > 0 && getCurrentIndex() == 0) {
|
|
// Didn't work from the first try, give it another go
|
|
HDEBUG("retrying...");
|
|
positionViewAtIndex(aIndex, iCenterMode);
|
|
}
|
|
iPositionIsChanging = false;
|
|
updateCurrentIndex();
|
|
}
|
|
|
|
void BooksListWatcher::positionViewAtIndex(int aIndex, int aMode)
|
|
{
|
|
if (iListView) {
|
|
QMetaObject::invokeMethod(iListView,
|
|
LISTVIEW_POSITION_VIEW_AT_INDEX,
|
|
Q_ARG(int,aIndex), Q_ARG(int,aMode));
|
|
}
|
|
}
|
|
|
|
qreal BooksListWatcher::contentX()
|
|
{
|
|
return getRealProperty(LISTVIEW_CONTENT_X);
|
|
}
|
|
|
|
qreal BooksListWatcher::contentY()
|
|
{
|
|
return getRealProperty(LISTVIEW_CONTENT_Y);
|
|
}
|
|
|
|
qreal BooksListWatcher::contentWidth()
|
|
{
|
|
return getRealProperty(LISTVIEW_CONTENT_WIDTH);
|
|
}
|
|
|
|
qreal BooksListWatcher::contentHeight()
|
|
{
|
|
return getRealProperty(LISTVIEW_CONTENT_HEIGHT);
|
|
}
|
|
|
|
int BooksListWatcher::getCurrentIndex()
|
|
{
|
|
if (iListView) {
|
|
int index = -1;
|
|
if (QMetaObject::invokeMethod(iListView, LISTVIEW_INDEX_AT,
|
|
Q_RETURN_ARG(int,index), Q_ARG(qreal,iContentX+width()/2),
|
|
Q_ARG(qreal,iContentY+height()/2))) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
void BooksListWatcher::tryToRestoreCurrentIndex()
|
|
{
|
|
HASSERT(!iPositionIsChanging);
|
|
const int index = getCurrentIndex();
|
|
if (iCurrentIndex != index) {
|
|
if (iCurrentIndex >= 0) {
|
|
doPositionViewAtIndex(iCurrentIndex);
|
|
}
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::updateCurrentIndex()
|
|
{
|
|
HASSERT(!iPositionIsChanging);
|
|
if (contentWidth() > 0 || contentHeight() > 0) {
|
|
const int index = getCurrentIndex();
|
|
if (iCurrentIndex != index) {
|
|
iCurrentIndex = index;
|
|
HDEBUG(index << contentWidth() << "x" << contentHeight());
|
|
Q_EMIT currentIndexChanged();
|
|
}
|
|
} else {
|
|
HDEBUG(contentWidth() << "x" << contentHeight());
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::updateSize()
|
|
{
|
|
const QSize size(iListView->width(), iListView->height());
|
|
HDEBUG(size);
|
|
if (iSize != size) {
|
|
const QSize oldSize(iSize);
|
|
iSize = size;
|
|
tryToRestoreCurrentIndex();
|
|
Q_EMIT sizeChanged();
|
|
if (oldSize.width() != iSize.width()) {
|
|
Q_EMIT widthChanged();
|
|
}
|
|
if (oldSize.height() != iSize.height()) {
|
|
Q_EMIT heightChanged();
|
|
}
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::onWidthChanged()
|
|
{
|
|
HASSERT(sender() == iListView);
|
|
HDEBUG(iListView->width());
|
|
// Width change will probably be followed by height change
|
|
iResizeTimer->start();
|
|
}
|
|
|
|
void BooksListWatcher::onHeightChanged()
|
|
{
|
|
HASSERT(sender() == iListView);
|
|
HDEBUG(iListView->height());
|
|
if (iResizeTimer->isActive()) {
|
|
// Height is usually changed after width
|
|
iResizeTimer->stop();
|
|
updateSize();
|
|
} else {
|
|
iResizeTimer->start();
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::onResizeTimeout()
|
|
{
|
|
// This can only happen if only width or height has changed. Normally,
|
|
// width change is followed by height change and view is reset from the
|
|
// setHeight() method
|
|
updateSize();
|
|
}
|
|
|
|
void BooksListWatcher::onContentXChanged()
|
|
{
|
|
HASSERT(sender() == iListView);
|
|
iContentX = contentX();
|
|
if (!iPositionIsChanging) {
|
|
updateCurrentIndex();
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::onContentYChanged()
|
|
{
|
|
HASSERT(sender() == iListView);
|
|
iContentY = contentY();
|
|
if (!iPositionIsChanging) {
|
|
updateCurrentIndex();
|
|
}
|
|
}
|
|
|
|
void BooksListWatcher::onContentSizeChanged()
|
|
{
|
|
HASSERT(sender() == iListView);
|
|
if (!iPositionIsChanging) {
|
|
tryToRestoreCurrentIndex();
|
|
updateCurrentIndex();
|
|
}
|
|
}
|