Permit use of up/down keys to increment/decrement counter value; Fix #3618 (#3646)

* Fix #3618

* clanfigy me softly

* fix unused var and params

* Frce the dialog being modal; ensure self deletion

* More qt-like behavior

* Restore dialogSemaphore logic

cockatrice/src/abstractcounter.cpp

@@ -8,8 +8,10 @@
 #include <QApplication>
 #include <QGraphicsSceneHoverEvent>
 #include <QGraphicsSceneMouseEvent>
+#include <QKeyEvent>
 #include <QMenu>
 #include <QPainter>
+#include <QString>
 
 AbstractCounter::AbstractCounter(Player *_player,
                                  int _id,
@@ -160,24 +162,59 @@ void AbstractCounter::incrementCounter()
 
 void AbstractCounter::setCounter()
 {
-    bool ok;
     dialogSemaphore = true;
-    QString expression = QInputDialog::getText(nullptr, tr("Set counter"), tr("New value for counter '%1':").arg(name),
-                                               QLineEdit::Normal, QString::number(value), &ok);
-
-    Expression exp(value);
-    int newValue = static_cast<int>(exp.parse(expression));
+    AbstractCounterDialog dialog(name, QString::number(value));
+    const int ok = dialog.exec();
 
     if (deleteAfterDialog) {
         deleteLater();
         return;
     }
     dialogSemaphore = false;
+
     if (!ok)
         return;
 
+    Expression exp(value);
+    int newValue = static_cast<int>(exp.parse(dialog.textValue()));
+
     Command_SetCounter cmd;
     cmd.set_counter_id(id);
     cmd.set_value(newValue);
     player->sendGameCommand(cmd);
 }
+
+AbstractCounterDialog::AbstractCounterDialog(const QString &name, const QString &value) : QInputDialog(nullptr)
+{
+    setWindowTitle(tr("Set counter"));
+    setLabelText(tr("New value for counter '%1':").arg(name));
+    setTextValue(value);
+    qApp->installEventFilter(this);
+}
+
+bool AbstractCounterDialog::eventFilter(QObject *obj, QEvent *event)
+{
+    Q_UNUSED(obj);
+    if (event->type() == QEvent::KeyPress) {
+        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
+        switch (keyEvent->key()) {
+            case Qt::Key_Up:
+                changeValue(+1);
+                return true;
+            case Qt::Key_Down:
+                changeValue(-1);
+                return true;
+        }
+    }
+    return false;
+}
+
+void AbstractCounterDialog::changeValue(int diff)
+{
+    bool ok;
+    int curValue = textValue().toInt(&ok);
+    if (!ok)
+        return;
+    curValue += diff;
+    setTextValue(QString::number(curValue));
+}

cockatrice/src/abstractcounter.h

@@ -2,10 +2,13 @@
 #define COUNTER_H
 
 #include <QGraphicsItem>
+#include <QInputDialog>
 
 class Player;
-class QMenu;
 class QAction;
+class QKeyEvent;
+class QMenu;
+class QString;
 
 class AbstractCounter : public QObject, public QGraphicsItem
 {
@@ -74,4 +77,15 @@ public:
     }
 };
 
+class AbstractCounterDialog : public QInputDialog
+{
+    Q_OBJECT
+public:
+    AbstractCounterDialog(const QString &name, const QString &value);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *event);
+    void changeValue(int diff);
+};
+
 #endif