Copy of label, will be able to scroll text for ChangeValueDisplay etc

CMakeLists.txt

@@ -51,6 +51,7 @@ set(headers
     src/widgets/label.h
     src/widgets/progressbar.h
     src/widgets/reverseprogressbar.h
+    src/widgets/scrollinglabel.h
     src/widgets/slider.h
     src/widgets/verticalmeter.h
     src/widgets/vumeter.h
@@ -81,6 +82,7 @@ set(sources
     src/widgets/label.cpp
     src/widgets/progressbar.cpp
     src/widgets/reverseprogressbar.cpp
+    src/widgets/scrollinglabel.cpp
     src/widgets/slider.cpp
     src/widgets/verticalmeter.cpp
     src/widgets/vumeter.cpp

src/widgets/scrollinglabel.cpp

@@ -0,0 +1,60 @@
+#include "scrollinglabel.h"
+
+// local includes
+#include "tftinstance.h"
+#include "richtextrenderer.h"
+
+namespace espgui {
+ScrollingLabel::ScrollingLabel(int x, int y) :
+    m_x{x},
+    m_y{y}
+{
+}
+
+void ScrollingLabel::start()
+{
+    m_lastStr.clear();
+    m_lastFont = -1;
+    m_lastColor = -1;
+
+    m_lastWidth = 0;
+    m_lastHeight = 0;
+}
+
+void ScrollingLabel::redraw(const std::string& str, bool forceRedraw)
+{
+    /*if (m_lastStr == str &&
+        m_lastFont == tft.textfont &&
+        m_lastColor == tft.textcolor &&
+        !forceRedraw)
+        return;
+
+    const auto renderedWidth = renderRichText(str, m_x, m_y);
+    const auto renderedHeight = tft.fontHeight();
+
+    if (renderedWidth < m_lastWidth)
+        tft.fillRect(m_x + renderedWidth, m_y,
+                     m_lastWidth - renderedWidth, m_lastHeight,
+                     tft.textbgcolor);
+
+    if (renderedHeight < m_lastHeight)
+        tft.fillRect(m_x, m_y + renderedHeight,
+                     renderedWidth, m_lastHeight - renderedHeight,
+                     tft.textbgcolor);
+
+    m_lastStr = str;
+    m_lastFont = tft.textfont;
+    m_lastColor = tft.textcolor;
+
+    m_lastWidth = renderedWidth;
+    m_lastHeight = renderedHeight;*/
+}
+
+void ScrollingLabel::clear()
+{
+    if (m_lastWidth || m_lastHeight)
+        tft.fillRect(m_x, m_y, m_lastWidth, m_lastHeight, tft.textbgcolor);
+
+    start();
+}
+}

src/widgets/scrollinglabel.h

@@ -0,0 +1,36 @@
+#pragma once
+
+// system includes
+#include <string>
+
+namespace espgui {
+class ScrollingLabel
+{
+public:
+    ScrollingLabel(int x, int y);
+
+    int x() const { return m_x; };
+    int y() const { return m_y; };
+
+    void start();
+    void redraw(const std::string& str, bool forceRedraw = false);
+    void clear();
+
+private:
+    const int m_x;
+    const int m_y;
+
+    std::string m_lastStr;
+    std::string m_str;
+    std::string_view visibleStr;
+    int m_lastFont;
+    int m_lastColor;
+
+    int m_lastWidth;
+    int m_lastHeight;
+};
+
+class AutoScrollingLabel : public ScrollingLabel // needs void update()
+{
+};
+} // namespace espgui