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https://github.com/sqlitebrowser/sqlitebrowser.git
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49239dad1f
Improve the lazy population fatchData() calls when using the vertical scrollbar to make scrolling a lot smoother. Still not perfect but definitely a lot better than before.
91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
#include <QApplication>
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#include <QClipboard>
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#include <QKeySequence>
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#include <QKeyEvent>
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#include "ExtendedTableWidget.h"
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#include "sqlitetablemodel.h"
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#include <QScrollBar>
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#include <QHeaderView>
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ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
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QTableView(parent)
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{
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connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(vscrollbarChanged(int)));
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}
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void ExtendedTableWidget::copy()
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{
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// Get list of selected items
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QItemSelectionModel* selection = selectionModel();
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QModelIndexList indices = selection->selectedIndexes();
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// Abort if there's nothing to copy
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if(indices.size() == 0)
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return;
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// Sort the items by row, then by column
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qSort(indices);
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// Go through all the items...
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QString result;
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QModelIndex prev = indices.front();
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indices.removeFirst();
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foreach(QModelIndex index, indices)
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{
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// Add the content of this cell to the clipboard string
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result.append(QString("\"%1\"").arg(prev.data().toString()));
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// If this is a new row add a line break, if not add a tab for cell separation
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if(index.row() != prev.row())
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result.append("\r\n");
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else
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result.append("\t");
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prev = index;
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}
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result.append(QString("\"%1\"\r\n").arg(indices.last().data().toString())); // And the last cell
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// And finally add it to the clipboard
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qApp->clipboard()->setText(result);
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}
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void ExtendedTableWidget::keyPressEvent(QKeyEvent* event)
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{
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// Call a custom copy method when Ctrl-C is pressed
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if(event->matches(QKeySequence::Copy))
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copy();
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else
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QTableView::keyPressEvent(event);
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}
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void ExtendedTableWidget::updateGeometries()
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{
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// Call the parent implementation first - it does most of the actual logic
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QTableView::updateGeometries();
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// Check if a model has already been set yet
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if(model())
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{
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// If so and if it is a SqliteTableModel and if the parent implementation of this method decided that a scrollbar is needed, update its maximum value
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SqliteTableModel* m = qobject_cast<SqliteTableModel*>(model());
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if(m && verticalScrollBar()->maximum())
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verticalScrollBar()->setMaximum(m->totalRowCount());
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}
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}
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void ExtendedTableWidget::vscrollbarChanged(int value)
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{
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// Cancel if there is no model set yet - this shouldn't happen (because without a model there should be no scrollbar) but just to be sure...
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if(!model())
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return;
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// How many rows are visible right now?
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int row_top = rowAt(0) == -1 ? 0 : rowAt(0);
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int row_bottom = rowAt(height()) == -1 ? model()->rowCount() : rowAt(height());
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int num_visible_rows = row_bottom - row_top;
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// Fetch more data from the DB if necessary
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if((value + num_visible_rows) >= model()->rowCount() && model()->canFetchMore(QModelIndex()))
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model()->fetchMore(QModelIndex());
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}
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