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-rw-r--r--src/declarative/graphicsitems/qdeclarativeflickable.cpp71
1 files changed, 48 insertions, 23 deletions
diff --git a/src/declarative/graphicsitems/qdeclarativeflickable.cpp b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
index a6e8c85818..062bbfb92d 100644
--- a/src/declarative/graphicsitems/qdeclarativeflickable.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
@@ -350,24 +350,34 @@ void QDeclarativeFlickablePrivate::updateBeginningEnd()
\brief The Flickable item provides a surface that can be "flicked".
\inherits Item
- Flickable places its children on a surface that can be dragged and flicked.
+ The Flickable item places its children on a surface that can be dragged
+ and flicked, causing the view onto the child items to scroll. This
+ behavior forms the basis of Items that are designed to show large numbers
+ of child items, such as \l ListView and \l GridView.
- \code
- import Qt 4.7
+ In traditional user interfaces, views can be scrolled using standard
+ controls, such as scroll bars and arrow buttons. In some situations, it
+ is also possible to drag the view directly by pressing and holding a
+ mouse button while moving the cursor. In touch-based user interfaces,
+ this dragging action is often complemented with a flicking action, where
+ scrolling continues after the user has stopped touching the view.
- Flickable {
- width: 200; height: 200
- contentWidth: image.width; contentHeight: image.height
+ Flickable does not automatically clip its contents. If it is not used as
+ a full-screen item, you should consider setting the \l{Item::}{clip} property
+ to true.
- Image { id: image; source: "bigImage.png" }
- }
- \endcode
+ \section1 Example Usage
+
+ \beginfloatright
+ \inlineimage flickable.gif
+ \endfloat
- \image flickable.gif
+ The following example shows a large
- Flickable does not automatically clip its contents. If
- it is not full-screen it is likely that \l {Item::clip}{clip} should be set
- to \c true.
+ \clearfloat
+ \snippet doc/src/snippets/declarative/flickable.qml document
+
+ \section1 Limitations
\note Due to an implementation detail, items placed inside a Flickable cannot anchor to it by
\c id. Use \c parent instead.
@@ -491,12 +501,15 @@ void QDeclarativeFlickable::setContentY(qreal pos)
/*!
\qmlproperty bool Flickable::interactive
- This property holds whether the user can interact with the Flickable. A user
- cannot drag or flick a Flickable that is not interactive.
+ This property describes whether the user can interact with the Flickable.
+ A user cannot drag or flick a Flickable that is not interactive.
+
+ By default, this property is true.
This property is useful for temporarily disabling flicking. This allows
- special interaction with Flickable's children: for example, you might want to
- freeze a flickable map while scrolling through a pop-up dialog that is a child of the Flickable.
+ special interaction with Flickable's children; for example, you might want
+ to freeze a flickable map while scrolling through a pop-up dialog that
+ is a child of the Flickable.
*/
bool QDeclarativeFlickable::isInteractive() const
{
@@ -653,6 +666,8 @@ void QDeclarativeFlickablePrivate::handleMousePressEvent(QGraphicsSceneMouseEven
timeline.clear();
hData.velocity = 0;
vData.velocity = 0;
+ hData.dragStartOffset = 0;
+ vData.dragStartOffset = 0;
lastPos = QPoint();
QDeclarativeItemPrivate::start(lastPosTime);
pressPos = event->pos();
@@ -675,7 +690,9 @@ void QDeclarativeFlickablePrivate::handleMouseMoveEvent(QGraphicsSceneMouseEvent
if (q->yflick()) {
int dy = int(event->pos().y() - pressPos.y());
if (qAbs(dy) > QApplication::startDragDistance() || QDeclarativeItemPrivate::elapsed(pressTime) > 200) {
- qreal newY = dy + vData.pressPos;
+ if (!vMoved)
+ vData.dragStartOffset = dy;
+ qreal newY = dy + vData.pressPos - vData.dragStartOffset;
const qreal minY = q->minYExtent();
const qreal maxY = q->maxYExtent();
if (newY > minY)
@@ -705,7 +722,9 @@ void QDeclarativeFlickablePrivate::handleMouseMoveEvent(QGraphicsSceneMouseEvent
if (q->xflick()) {
int dx = int(event->pos().x() - pressPos.x());
if (qAbs(dx) > QApplication::startDragDistance() || QDeclarativeItemPrivate::elapsed(pressTime) > 200) {
- qreal newX = dx + hData.pressPos;
+ if (!hMoved)
+ hData.dragStartOffset = dx;
+ qreal newX = dx + hData.pressPos - hData.dragStartOffset;
const qreal minX = q->minXExtent();
const qreal maxX = q->maxXExtent();
if (newX > minX)
@@ -995,12 +1014,16 @@ void QDeclarativeFlickable::geometryChanged(const QRectF &newGeometry,
bool changed = false;
if (newGeometry.width() != oldGeometry.width()) {
+ if (xflick())
+ changed = true;
if (d->hData.viewSize < 0) {
d->contentItem->setWidth(width());
emit contentWidthChanged();
}
}
if (newGeometry.height() != oldGeometry.height()) {
+ if (yflick())
+ changed = true;
if (d->vData.viewSize < 0) {
d->contentItem->setHeight(height());
emit contentHeightChanged();
@@ -1248,6 +1271,7 @@ bool QDeclarativeFlickable::sendMouseEvent(QGraphicsSceneMouseEvent *event)
if (mouseEvent.type() == QEvent::GraphicsSceneMouseRelease) {
d->clearDelayedPress();
d->stealMouse = false;
+ d->pressed = false;
}
return false;
}
@@ -1322,8 +1346,8 @@ bool QDeclarativeFlickable::isFlicking() const
\qmlproperty bool Flickable::flickingHorizontally
\qmlproperty bool Flickable::flickingVertically
- These properties hold whether the view is currently moving horizontally
- or vertically due to the user flicking the view.
+ These properties describe whether the view is currently moving horizontally,
+ vertically or in either direction, due to the user flicking the view.
*/
bool QDeclarativeFlickable::isFlickingHorizontally() const
{
@@ -1375,8 +1399,9 @@ bool QDeclarativeFlickable::isMoving() const
\qmlproperty bool Flickable::movingHorizontally
\qmlproperty bool Flickable::movingVertically
- These properties hold whether the view is currently moving horizontally
- or vertically due to the user either dragging or flicking the view.
+ These properties describe whether the view is currently moving horizontally,
+ vertically or in either direction, due to the user either dragging or
+ flicking the view.
*/
bool QDeclarativeFlickable::isMovingHorizontally() const
{