Added slider

CMakeLists.txt

@@ -50,6 +50,7 @@ set(headers
     src/widgets/label.h
     src/widgets/progressbar.h
     src/widgets/reverseprogressbar.h
+    src/widgets/slider.h
     src/widgets/verticalmeter.h
     src/widgets/vumeter.h
 )
@@ -79,6 +80,7 @@ set(sources
     src/widgets/label.cpp
     src/widgets/progressbar.cpp
     src/widgets/reverseprogressbar.cpp
+    src/widgets/slider.cpp
     src/widgets/verticalmeter.cpp
     src/widgets/vumeter.cpp
 )

src/widgets/slider.cpp

@@ -0,0 +1,44 @@
+#include "slider.h"
+
+// 3rdparty lib includes
+#include <cpputils.h>
+
+// local includes
+#include "tftinstance.h"
+
+namespace espgui {
+Slider::Slider(int x, int y, int width, int height, int min, int max, uint32_t leftColor, uint32_t rightColor, uint32_t lineColor) :
+    m_x{x},
+    m_y{y},
+    m_width{width},
+    m_height{height},
+    m_min{min},
+    m_max{max},
+    m_leftColor{leftColor},
+    m_rightColor{rightColor},
+    m_lineColor{lineColor}
+{}
+
+void Slider::start()
+{
+    m_lastValue = m_x+1;
+    tft.drawRect(m_x, m_y, m_width, m_height, TFT_WHITE);
+    tft.fillRect(m_x+1, m_y+1, m_width-2, m_height-2, m_rightColor);
+}
+
+void Slider::redraw(int value)
+{
+    // slider with 1 pixel white line at position of value (mapped). Left side of line is leftColor, right side is rightColor
+    value = cpputils::mapValueClamped(value, m_min, m_max, m_x+1, m_x+m_width-1);
+
+    if (value < m_lastValue)
+        tft.fillRect(value, m_y+1, m_lastValue-value+1, m_height-2, m_rightColor);
+    else if (value > m_lastValue)
+        tft.fillRect(m_lastValue, m_y+1, value-m_lastValue, m_height-2, m_leftColor);
+
+    m_lastValue = value;
+
+    // draw slider line
+    tft.drawFastVLine(std::min(value, m_x+m_width-2), m_y+1, m_height-2, m_lineColor);
+}
+} // namespace espgui

src/widgets/slider.h

@@ -0,0 +1,31 @@
+#pragma once
+
+// system includes
+#include <cstdint>
+
+// 3rdparty lib includes
+#include <TFT_eSPI.h>
+
+namespace espgui {
+class Slider
+{
+public:
+    Slider(int x, int y, int width, int height, int min, int max, uint32_t leftColor = color565(180, 180, 0), uint32_t rightColor = TFT_YELLOW, uint32_t lineColor = TFT_BLACK);
+
+    void start();
+    void redraw(int value);
+
+private:
+    const int m_x;
+    const int m_y;
+    const int m_width;
+    const int m_height;
+    const int m_min;
+    const int m_max;
+    const uint32_t m_leftColor;
+    const uint32_t m_rightColor;
+    const uint32_t m_lineColor;
+
+    int m_lastValue{};
+};
+} // namespace espgui