[libcamera-devel] [PATCH v2 06/11] qcam: Add Float Slider

[Utkarsh Tiwari]

Qt doesn't support float value sliders.
Implement a float slider to help implementing intereactive controls
GUI for ControlTypeFloat

Signed-off-by: Utkarsh Tiwari <utkarsh02t at gmail.com>
---
 src/qcam/meson.build       |  1 +
 src/qcam/settings/slider.h | 63 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 src/qcam/settings/slider.h

diff --git a/src/qcam/meson.build b/src/qcam/meson.build
index 7a785fd0..b6a09c87 100644
--- a/src/qcam/meson.build
+++ b/src/qcam/meson.build
@@ -35,6 +35,7 @@ qcam_moc_headers = files([
     'settings/control_frame.h',
     'settings/controls_tab.h',
     'settings/settings_dialog.h',
+    'settings/slider.h',
     'viewfinder_qt.h',
 ])
 
diff --git a/src/qcam/settings/slider.h b/src/qcam/settings/slider.h
new file mode 100644
index 00000000..f4a4825c
--- /dev/null
+++ b/src/qcam/settings/slider.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022, Utkarsh Tiwari <utkarsh02t at gmail.com>
+ *
+ * slider.h - qcam - Slider
+ */
+
+#pragma once
+
+#include <QSlider>
+#include <QWidget>
+
+class FloatSlider : public QSlider
+{
+	Q_OBJECT
+
+	const float INT_TO_FLOAT = 100.0;
+
+public:
+	FloatSlider(QWidget *parent)
+		: QSlider(parent)
+	{
+		connect(this, &QSlider::valueChanged,
+			this, &FloatSlider::notifyValueChanged);
+	}
+
+	~FloatSlider() = default;
+
+	void setValue(float value)
+	{
+		QSlider::setValue(value * INT_TO_FLOAT);
+	}
+
+	void setRange(float min, float max)
+	{
+		QSlider::setRange(min * INT_TO_FLOAT, max * INT_TO_FLOAT);
+	}
+
+	float minimum()
+	{
+		return QSlider::minimum() / INT_TO_FLOAT;
+	}
+
+	float maximum()
+	{
+		return QSlider::maximum() / INT_TO_FLOAT;
+	}
+
+	float value()
+	{
+		return QSlider::value() / INT_TO_FLOAT;
+	}
+
+Q_SIGNALS:
+	void valueChanged(float value);
+
+public Q_SLOTS:
+	void notifyValueChanged(int value)
+	{
+		float floatVal = value / INT_TO_FLOAT;
+		Q_EMIT valueChanged(floatVal);
+	}
+};
-- 
2.25.1