[libcamera-devel] [PATCH v2 07/11] qcam: Slider: Add SliderLayout to display value

[Utkarsh Tiwari]

Implement SliderLayout which displays minimum Value, maximum Value,
currentValue of the slider. The currentValue may not reflect the
immediate current value of the control.

The SliderLayout is inherits the Slider type so it can support both
floatSlider and integer sliders.

Signed-off-by: Utkarsh Tiwari <utkarsh02t at gmail.com>
---
 src/qcam/settings/slider.h | 81 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 78 insertions(+), 3 deletions(-)

diff --git a/src/qcam/settings/slider.h b/src/qcam/settings/slider.h
index f4a4825c..008c746c 100644
--- a/src/qcam/settings/slider.h
+++ b/src/qcam/settings/slider.h
@@ -7,18 +7,46 @@
 
 #pragma once
 
+#include <QHBoxLayout>
+#include <QLabel>
 #include <QSlider>
+#include <QVBoxLayout>
 #include <QWidget>
 
-class FloatSlider : public QSlider
+class Slider : public QSlider
+{
+	Q_OBJECT
+
+public:
+	Slider(QWidget *parent = nullptr)
+		: QSlider(parent){};
+	~Slider() = default;
+
+	virtual QString maximumValueStr()
+	{
+		return QString::number(maximum());
+	}
+
+	virtual QString minimumValueStr()
+	{
+		return QString::number(minimum());
+	}
+
+	virtual QString currValueStr()
+	{
+		return QString::number(value());
+	}
+};
+
+class FloatSlider : public Slider
 {
 	Q_OBJECT
 
 	const float INT_TO_FLOAT = 100.0;
 
 public:
-	FloatSlider(QWidget *parent)
-		: QSlider(parent)
+	FloatSlider(QWidget *parent = nullptr)
+		: Slider(parent)
 	{
 		connect(this, &QSlider::valueChanged,
 			this, &FloatSlider::notifyValueChanged);
@@ -51,6 +79,21 @@ public:
 		return QSlider::value() / INT_TO_FLOAT;
 	}
 
+	QString maximumValueStr() override
+	{
+		return QString::number(maximum());
+	}
+
+	QString minimumValueStr() override
+	{
+		return QString::number(minimum());
+	}
+
+	QString currValueStr() override
+	{
+		return QString::number(value());
+	}
+
 Q_SIGNALS:
 	void valueChanged(float value);
 
@@ -61,3 +104,35 @@ public Q_SLOTS:
 		Q_EMIT valueChanged(floatVal);
 	}
 };
+
+class SliderLayout : public QWidget
+{
+	Q_OBJECT
+
+public:
+	SliderLayout(Slider *slider, QWidget *parent = nullptr)
+		: QWidget(parent)
+	{
+		QVBoxLayout *mainVLayout = new QVBoxLayout(this);
+
+		QHBoxLayout *labelHLayout = new QHBoxLayout;
+
+		QLabel *minLabel = new QLabel(slider->minimumValueStr());
+		QLabel *currValueLabel = new QLabel(slider->currValueStr());
+		QLabel *maxLabel = new QLabel(slider->maximumValueStr());
+
+		connect(slider, &Slider::valueChanged,
+			this, [currValueLabel, slider]() {
+				currValueLabel->setText(slider->currValueStr());
+			});
+
+		labelHLayout->addWidget(minLabel);
+		labelHLayout->addStretch();
+		labelHLayout->addWidget(currValueLabel);
+		labelHLayout->addStretch();
+		labelHLayout->addWidget(maxLabel);
+
+		mainVLayout->addLayout(labelHLayout);
+		mainVLayout->addWidget(slider);
+	}
+};
-- 
2.25.1