scrollable_view.cpp
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#include <escher/scrollable_view.h>
#include <escher/metric.h>
#include <assert.h>
ScrollableView::ScrollableView(Responder * parentResponder, View * view, ScrollViewDataSource * dataSource) :
Responder(parentResponder),
ScrollView(view, dataSource, 0, 0, 0, 0, false, false),
m_manualScrollingOffset(KDPointZero)
{
}
bool ScrollableView::handleEvent(Ion::Events::Event event) {
KDPoint translation = KDPointZero;
if (event == Ion::Events::Left) {
KDCoordinate movementToEdge = m_manualScrollingOffset.x();
if (movementToEdge > 0) {
translation = KDPoint(-min(Metric::ScrollStep, movementToEdge), 0);
}
}
if (event == Ion::Events::Right) {
KDCoordinate movementToEdge = m_contentView->minimalSizeForOptimalDisplay().width() - bounds().width() - m_manualScrollingOffset.x();
if (movementToEdge > 0) {
translation = KDPoint(min(Metric::ScrollStep, movementToEdge), 0);
}
}
if (event == Ion::Events::Up) {
KDCoordinate movementToEdge = m_manualScrollingOffset.y();
if (movementToEdge > 0) {
translation = KDPoint(0, -min(Metric::ScrollStep, movementToEdge));
}
}
if (event == Ion::Events::Down) {
KDCoordinate movementToEdge = m_contentView->minimalSizeForOptimalDisplay().height() - bounds().height() - m_manualScrollingOffset.y();
if (movementToEdge > 0) {
translation = KDPoint(0, min(Metric::ScrollStep, movementToEdge));
}
}
if (translation != KDPointZero) {
m_manualScrollingOffset = m_manualScrollingOffset.translatedBy(translation);
setContentOffset(m_manualScrollingOffset);
return true;
}
return false;
}
void ScrollableView::reloadScroll() {
m_manualScrollingOffset = KDPointZero;
setContentOffset(m_manualScrollingOffset);
}
void ScrollableView::layoutSubviews() {
KDSize viewSize = contentSize();
KDCoordinate viewWidth = viewSize.width() < bounds().width() ? bounds().width() : viewSize.width();
KDCoordinate viewHeight = viewSize.height() < bounds().height() ? bounds().height() : viewSize.height();
m_contentView->setSize(KDSize(viewWidth, viewHeight));
ScrollView::layoutSubviews();
}