Scale UI component, used in launcher

src/blackgui/components/scalescreenfactor.cpp

@@ -0,0 +1,77 @@
+/* Copyright (C) 2018
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "scalescreenfactor.h"
+#include "ui_scalescreenfactor.h"
+#include <QIntValidator>
+
+namespace BlackGui
+{
+    namespace Components
+    {
+        CScaleScreenFactor::CScaleScreenFactor(QWidget *parent) :
+            QFrame(parent),
+            ui(new Ui::CScaleScreenFactor)
+        {
+            ui->setupUi(this);
+            this->setMinMax(50, 150);
+
+            connect(ui->hs_Factor, &QSlider::valueChanged, this, &CScaleScreenFactor::onSliderChanged);
+            connect(ui->le_Factor, &QLineEdit::editingFinished, this, &CScaleScreenFactor::onEditFinished);
+        }
+
+        CScaleScreenFactor::~CScaleScreenFactor()
+        { }
+
+        void CScaleScreenFactor::setMinMax(int min, int max)
+        {
+            ui->hs_Factor->setMinimum(min);
+            ui->hs_Factor->setMaximum(max);
+            ui->le_Factor->setValidator(new QIntValidator(min, max, ui->le_Factor));
+
+            static const QString info("%1-%2");
+            ui->le_Factor->setToolTip(info.arg(min).arg(max));
+            ui->le_Factor->setPlaceholderText(info.arg(min).arg(max));
+            ui->hs_Factor->setToolTip(info.arg(min, max));
+
+            const int v = (min + max) / 2;
+            ui->hs_Factor->setValue(v);
+            ui->le_Factor->setText(QString::number(v));
+        }
+
+        qreal CScaleScreenFactor::getScaleFactor() const
+        {
+            return 0.01 * ui->hs_Factor->value();
+        }
+
+        QString CScaleScreenFactor::getScaleFactorAsString() const
+        {
+            const QString sf = QString::number(this->getScaleFactor(), 'f', 2);
+            return sf;
+        }
+
+        void CScaleScreenFactor::onSliderChanged(int value)
+        {
+            const QString v = QString::number(value);
+            if (ui->le_Factor->text() == v) { return; } // avoid signal roundtrips
+            ui->le_Factor->setText(v);
+        }
+
+        void CScaleScreenFactor::onEditFinished()
+        {
+            const QString v =  ui->le_Factor->text();
+            if (v.isEmpty()) { return; }
+            bool ok;
+            const int value = v.toInt(&ok);
+            if (!ok) { return; }
+            if (ui->hs_Factor->value() == value) { return; } // avoid signal roundtrips
+            ui->hs_Factor->setValue(value);
+        }
+    } // ns
+} // ns