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Escher: Add TableView::cellAtIndex

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Change-Id: I7b78b7fa05d4c1390dd7c58ef098b3708c972119
This commit is contained in:
Romain Goyet
2016-06-14 17:04:46 +02:00
parent e280a6e533
commit d5606367d7
2 changed files with 21 additions and 5 deletions
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6
escher/include/escher/table_view.h
View File

@@ -15,9 +15,10 @@ public:
class TableView : public ScrollView {
public:
TableView(TableViewDataSource * dataSource);
void layoutSubviews() override;
void scrollToRow(int index);
void layoutSubviews() override;
View * cellAtIndex(int index);
protected:
#if ESCHER_VIEW_LOGGING
const char * className() const override;
@@ -31,12 +32,15 @@ private:
View * subview(int index) override;
void storeSubviewAtIndex(View * view, int index) override;
void layoutSubviews() override;
View * cellAtIndex(int index);
protected:
#if ESCHER_VIEW_LOGGING
const char * className() const override;
#endif
private:
int numberOfDisplayableCells() const;
int cellScrollingOffset() const;
TableViewDataSource * m_dataSource;
};

20
escher/src/table_view.cpp
View File

@@ -30,6 +30,10 @@ void TableView::scrollToRow(int index) {
setContentOffset(contentOffset);
}
View * TableView::cellAtIndex(int index) {
return m_contentView.cellAtIndex(index);
}
#if ESCHER_VIEW_LOGGING
const char * TableView::className() const {
return "TableView";
@@ -62,10 +66,7 @@ void TableView::ContentView::storeSubviewAtIndex(View * view, int index) {
}
void TableView::ContentView::layoutSubviews() {
/* Here, we want to translate the offset at which our superview is displaying
* us into an integer offset we can use to ask cells to our data source. */
KDCoordinate pixelScrollingOffset = m_frame.y;
int cellOffset = pixelScrollingOffset / m_dataSource->cellHeight();
int cellOffset = cellScrollingOffset();
for (int i=0; i<numberOfSubviews(); i++) {
View * cell = subview(i);
@@ -83,6 +84,10 @@ void TableView::ContentView::layoutSubviews() {
}
}
View * TableView::ContentView::cellAtIndex(int index) {
return m_dataSource->reusableCell(index - cellScrollingOffset());
}
#if ESCHER_VIEW_LOGGING
const char * TableView::ContentView::className() const {
return "TableView::ContentView";
@@ -94,3 +99,10 @@ int TableView::ContentView::numberOfDisplayableCells() const {
assert(result <= m_dataSource->reusableCellCount());
return result;
}
int TableView::ContentView::cellScrollingOffset() const {
/* Here, we want to translate the offset at which our superview is displaying
* us into an integer offset we can use to ask cells to our data source. */
KDCoordinate pixelScrollingOffset = m_frame.y;
return pixelScrollingOffset / m_dataSource->cellHeight();
}