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Implement Delete key command

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This commit is contained in:
G.K.MacGregor
2021-02-12 21:33:06 +00:00
parent d5bb0417af
commit 9a997d1bfa
3 changed files with 75 additions and 0 deletions
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53
levelonecommands.cpp
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@@ -185,6 +185,58 @@ bool BackspaceCommand::mergeWith(const QUndoCommand *command)
}
DeleteKeyCommand::DeleteKeyCommand(TeletextDocument *teletextDocument, QUndoCommand *parent) : QUndoCommand(parent)
{
m_teletextDocument = teletextDocument;
m_subPageIndex = teletextDocument->currentSubPageIndex();
m_row = teletextDocument->cursorRow();
m_column = teletextDocument->cursorColumn();
for (int c=0; c<40; c++)
m_oldRowContents[c] = m_newRowContents[c] = m_teletextDocument->currentSubPage()->character(m_row, c);
setText(QObject::tr("delete"));
}
void DeleteKeyCommand::redo()
{
m_teletextDocument->selectSubPageIndex(m_subPageIndex);
for (int c=m_column; c<39; c++)
m_newRowContents[c] = m_newRowContents[c+1];
m_newRowContents[39] = 0x20;
for (int c=0; c<40; c++)
m_teletextDocument->currentSubPage()->setCharacter(m_row, c, m_newRowContents[c]);
m_teletextDocument->moveCursor(m_row, m_column);
emit m_teletextDocument->contentsChange(m_row);
}
void DeleteKeyCommand::undo()
{
m_teletextDocument->selectSubPageIndex(m_subPageIndex);
for (int c=0; c<40; c++)
m_teletextDocument->currentSubPage()->setCharacter(m_row, c, m_oldRowContents[c]);
m_teletextDocument->moveCursor(m_row, m_column);
emit m_teletextDocument->contentsChange(m_row);
}
bool DeleteKeyCommand::mergeWith(const QUndoCommand *command)
{
const DeleteKeyCommand *newerCommand = static_cast<const DeleteKeyCommand *>(command);
if (m_subPageIndex != newerCommand->m_subPageIndex || m_row != newerCommand->m_row || m_column != newerCommand->m_column)
return false;
for (int c=0; c<40; c++)
m_newRowContents[c] = newerCommand->m_newRowContents[c];
return true;
}
InsertRowCommand::InsertRowCommand(TeletextDocument *teletextDocument, bool copyRow, QUndoCommand *parent) : QUndoCommand(parent)
{
m_teletextDocument = teletextDocument;
@@ -318,6 +370,7 @@ void DeleteSubPageCommand::undo()
m_teletextDocument->selectSubPageIndex(m_subPageToDelete, true);
}
SetColourCommand::SetColourCommand(TeletextDocument *teletextDocument, int colourIndex, int newColour, QUndoCommand *parent) : QUndoCommand(parent)
{
m_teletextDocument = teletextDocument;