Add ability to undo renumbering of dives

Expand the undo feature by storing a list of renumbered dives' ids
and numbers so that the original numbers can be restored if needed.

Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/simplewidgets.cpp

@@ -142,8 +142,17 @@ void RenumberDialog::renumberOnlySelected(bool selected)
 
 void RenumberDialog::buttonClicked(QAbstractButton *button)
 {
-	if (ui.buttonBox->buttonRole(button) == QDialogButtonBox::AcceptRole)
+	if (ui.buttonBox->buttonRole(button) == QDialogButtonBox::AcceptRole) {
-		renumber_dives(ui.spinBox->value(), selectedOnly);
+		QMap<int,int> renumberedDives;
+		int i;
+		struct dive *dive = NULL;
+		for_each_dive (i, dive) {
+			if (!selectedOnly || dive->selected)
+				renumberedDives.insert(dive->id, dive->number);
+		}
+		UndoRenumberDives *undoCommand = new UndoRenumberDives(renumberedDives, ui.spinBox->value());
+		MainWindow::instance()->undoStack->push(undoCommand);
+	}
 }
 
 RenumberDialog::RenumberDialog(QWidget *parent) : QDialog(parent), selectedOnly(false)

qt-ui/undocommands.cpp

@@ -62,3 +62,34 @@ void UndoShiftTime::redo()
 	mark_divelist_changed(true);
 	MainWindow::instance()->refreshDisplay();
 }
+
+
+UndoRenumberDives::UndoRenumberDives(QMap<int, int> originalNumbers, int startNumber)
+{
+	oldNumbers = originalNumbers;
+	start = startNumber;
+	setText("renumber dive");
+	if (oldNumbers.count() > 1)
+		setText(QString("renumber %1 dives").arg(QString::number(oldNumbers.count())));
+}
+
+void UndoRenumberDives::undo()
+{
+	foreach (int key, oldNumbers.keys()) {
+		struct dive* d = get_dive_by_uniq_id(key);
+		d->number = oldNumbers.value(key);
+	}
+	mark_divelist_changed(true);
+	MainWindow::instance()->refreshDisplay();
+}
+
+void UndoRenumberDives::redo()
+{
+	int i = start;
+	foreach (int key, oldNumbers.keys()) {
+		struct dive* d = get_dive_by_uniq_id(key);
+		d->number = i++;
+	}
+	mark_divelist_changed(true);
+	MainWindow::instance()->refreshDisplay();
+}

qt-ui/undocommands.h

@@ -2,6 +2,7 @@
 #define UNDOCOMMANDS_H
 
 #include <QUndoCommand>
+#include <QMap>
 #include "dive.h"
 
 class UndoDeleteDive : public QUndoCommand {
@@ -25,4 +26,15 @@ private:
 	int timeChanged;
 };
 
+class UndoRenumberDives : public QUndoCommand {
+public:
+	UndoRenumberDives(QMap<int,int> originalNumbers, int startNumber);
+	virtual void undo();
+	virtual void redo();
+
+private:
+	QMap<int,int> oldNumbers;
+	int start;
+};
+
 #endif // UNDOCOMMANDS_H