Feature #4566 » 0001-WTableView-Support-for-model-data-caching.patch
| src/Wt/WAbstractItemModel | ||
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const;
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/*! \brief Prepare the data beforehand.
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*
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* This is call before the retrieving the data. In some situtations it
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* it would be better to load the bulk of the data, insted of one by one.
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* This is mainly used by virtual table views.
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*/
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virtual void prepareData(int rowFrom, int rowTo);
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/*! \brief Returns the data item at the given column and row.
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*
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* This is a convenience method, and is equivalent to:
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| src/Wt/WAbstractItemModel.C | ||
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return result;
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}
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void WAbstractItemModel::prepareData(int rowFrom, int rowTo)
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{ }
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boost::any WAbstractItemModel::data(int row, int column, int role,
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const WModelIndex& parent) const
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{
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| src/Wt/WTableView.C | ||
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for (int i = 0; i < -bottomRowsToAdd; ++i)
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removeSection(Bottom);
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//If there are some columns defined
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if(rowHeaderCount() > 0 || (firstColumn() < lastColumn()))
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{
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// Only if got top rows
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if(topRowsToAdd > 0)
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model()->prepareData(firstRow() - topRowsToAdd, firstRow());
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// Only if got bottom rows
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else if(bottomRowsToAdd > 0)
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model()->prepareData(lastRow() + 1, lastRow() + bottomRowsToAdd);
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}
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// Add rows
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for (int i = 0; i < topRowsToAdd; i++) {
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int row = firstRow() - 1;
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| ... | ... | |
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addSection(Bottom, items);
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}
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// Only if there are some columns to add and we've got some rows
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if((leftColsToAdd > 0 || rightColsToAdd > 0) && firstRow() < lastRow())
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model()->prepareData(firstRow(), lastRow());
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// Add columns
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for (int i = 0; i < leftColsToAdd; ++i) {
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int col = firstColumn() - 1;
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