Show opacity slider value

src/config/extendedslider.cpp

@@ -0,0 +1,50 @@
+// Copyright 2017 Alejandro Sirgo Rica
+//
+// This file is part of Flameshot.
+//
+//     Flameshot is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+//
+//     Flameshot is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with Flameshot.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "extendedslider.h"
+
+ExtendedSlider::ExtendedSlider(QWidget *parent)
+    : QSlider(parent)
+{
+    connect(this, &ExtendedSlider::valueChanged,
+            this, &ExtendedSlider::updateTooltip);
+    connect(this, &ExtendedSlider::sliderMoved,
+            this, &ExtendedSlider::fireTimer);
+    m_timer.setSingleShot(true);
+    connect(&m_timer, &QTimer::timeout,
+            this, &ExtendedSlider::modificationsEnded);
+}
+
+int ExtendedSlider::mappedValue(int min, int max) {
+    qreal progress =
+            ((value() - minimum())) / static_cast<qreal>(maximum() - minimum());
+    return min + (max - min) * progress;
+}
+
+void ExtendedSlider::setMapedValue(int min, int val, int max) {
+    qreal progress = ((val - min) + 1) / static_cast<qreal>(max - min);
+    int value = minimum() + (maximum() - minimum()) * progress;
+    setValue(value);
+}
+
+void ExtendedSlider::updateTooltip() {
+    setToolTip(QString::number(value()));
+}
+
+void ExtendedSlider::fireTimer() {
+    m_timer.start(500);
+}