selectable_table_view.cpp
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#include <escher/selectable_table_view.h>
#include <escher/clipboard.h>
#include <assert.h>
SelectableTableView::SelectableTableView(Responder * parentResponder, TableViewDataSource * dataSource, SelectableTableViewDataSource * selectionDataSource, SelectableTableViewDelegate * delegate) :
TableView(dataSource, selectionDataSource),
Responder(parentResponder),
m_selectionDataSource(selectionDataSource),
m_delegate(delegate)
{
setCommonMargins();
assert(m_selectionDataSource != nullptr);
}
int SelectableTableView::selectedRow() {
return m_selectionDataSource->selectedRow();
}
int SelectableTableView::selectedColumn() {
return m_selectionDataSource->selectedColumn();
}
void SelectableTableView::selectRow(int j) {
m_selectionDataSource->selectRow(j);
}
void SelectableTableView::selectColumn(int i) {
m_selectionDataSource->selectColumn(i);
}
void SelectableTableView::reloadData(bool setFirstResponder) {
int col = selectedColumn();
int row = selectedRow();
deselectTable();
/* FIXME: The problem with calling deselectTable is that at this point in time
* the datasource's model is very likely to have changed. Therefore it's
* rather complicated to get a pointer to the currently selected cell (in
* order to deselect it). */
/* As a workaround, datasources can reset the highlighted state in their
* willDisplayCell callback. */
TableView::layoutSubviews();
selectCellAtLocation(col, row, setFirstResponder);
}
void SelectableTableView::didEnterResponderChain(Responder * previousFirstResponder) {
int col = selectedColumn();
int row = selectedRow();
selectColumn(0);
selectRow(-1);
selectCellAtLocation(col, row);
}
void SelectableTableView::willExitResponderChain(Responder * nextFirstResponder) {
unhighlightSelectedCell();
}
void SelectableTableView::deselectTable() {
unhighlightSelectedCell();
int previousSelectedCellX = selectedColumn();
int previousSelectedCellY = selectedRow();
selectColumn(0);
selectRow(-1);
if (m_delegate) {
m_delegate->tableViewDidChangeSelection(this, previousSelectedCellX, previousSelectedCellY);
}
}
bool SelectableTableView::selectCellAtLocation(int i, int j, bool setFirstResponder) {
if (i < 0 || i >= dataSource()->numberOfColumns()) {
return false;
}
if (j < 0 || j >= dataSource()->numberOfRows()) {
return false;
}
unhighlightSelectedCell();
int previousX = selectedColumn();
int previousY = selectedRow();
selectColumn(i);
selectRow(j);
if (selectedRow() >= 0) {
scrollToCell(i, j);
}
HighlightCell * cell = selectedCell();
if (cell) {
cell->setHighlighted(true);
// Update first responder
if ((i != previousX || j != previousY) && setFirstResponder) {
if (cell->responder()) {
app()->setFirstResponder(cell->responder());
} else {
app()->setFirstResponder(this);
}
}
}
if (m_delegate) {
m_delegate->tableViewDidChangeSelection(this, previousX, previousY);
}
return true;
}
HighlightCell * SelectableTableView::selectedCell() {
if (selectedColumn() < 0 || selectedRow() < 0) {
return nullptr;
}
return cellAtLocation(selectedColumn(), selectedRow());
}
bool SelectableTableView::handleEvent(Ion::Events::Event event) {
if (event == Ion::Events::Down) {
return selectCellAtLocation(selectedColumn(), selectedRow()+1);
}
if (event == Ion::Events::Up) {
return selectCellAtLocation(selectedColumn(), selectedRow()-1);
}
if (event == Ion::Events::Left) {
return selectCellAtLocation(selectedColumn()-1, selectedRow());
}
if (event == Ion::Events::Right) {
return selectCellAtLocation(selectedColumn()+1, selectedRow());
}
if (event == Ion::Events::Copy || event == Ion::Events::Cut) {
HighlightCell * cell = selectedCell();
if (cell == nullptr) {
return false;
}
const char * text = cell->text();
if (text) {
Clipboard::sharedClipboard()->store(text);
return true;
}
Poincare::ExpressionLayout * layout = cell->expressionLayout();
if (layout) {
Clipboard::sharedClipboard()->store(layout);
return true;
}
}
return false;
}
void SelectableTableView::unhighlightSelectedCell() {
if (selectedColumn() >= 0 && selectedColumn() < dataSource()->numberOfColumns() &&
selectedRow() >= 0 && selectedRow() < dataSource()->numberOfRows()) {
HighlightCell * previousCell = cellAtLocation(selectedColumn(), selectedRow());
previousCell->setHighlighted(false);
}
}