Add CenteredLabel

CMakeLists.txt

@@ -51,6 +51,7 @@ set(headers
     src/tftcolors.h
     src/titleinterface.h
     src/visibleinterface.h
+    src/widgets/centeredlabel.h
     src/widgets/graph.h
     src/widgets/label.h
     src/widgets/progressbar.h
@@ -84,6 +85,7 @@ set(sources
     src/icons/back_grey.cpp
     src/icons/checked_grey.cpp
     src/icons/unchecked_grey.cpp
+    src/widgets/centeredlabel.cpp
     src/widgets/label.cpp
     src/widgets/progressbar.cpp
     src/widgets/reverseprogressbar.cpp

src/widgets/centeredlabel.cpp

@@ -0,0 +1,83 @@
+#include "centeredlabel.h"
+
+// 3rdparty lib includes
+#include <fontrenderer.h>
+
+// local includes
+#include "tftinterface.h"
+#include "richtextrenderer.h"
+
+namespace espgui {
+CenteredLabel::CenteredLabel(int x, int y) :
+    m_x{x},
+    m_y{y}
+{
+}
+
+void CenteredLabel::start(TftInterface &tft)
+{
+    m_lastStr.clear();
+    m_lastFont = -1;
+    m_lastColor = -1;
+
+    m_lastWidth = 0;
+    m_lastHeight = 0;
+}
+
+void CenteredLabel::redraw(TftInterface &tft, std::string_view str, uint16_t color, uint16_t bgcolor, uint8_t font, bool forceRedraw)
+{
+    espgui::FontRenderer fontRenderer{tft};
+    redraw(tft, fontRenderer, str, color, bgcolor, font, forceRedraw);
+}
+
+void CenteredLabel::redraw(TftInterface &tft, FontRenderer &fontRenderer, std::string_view str, uint16_t color, uint16_t bgcolor, uint8_t font, bool forceRedraw)
+{
+    if (m_lastStr == str &&
+        m_lastColor == color &&
+        m_lastFont == font &&
+        !forceRedraw)
+        return;
+
+    const auto renderedWidth = fontRenderer.drawCentreString(str, m_x, m_y, color, bgcolor, font);
+    const auto renderedHeight = fontRenderer.fontHeight(font);
+
+    if (renderedWidth < m_lastWidth)
+    {
+        const auto oldLeftX = m_x - (m_lastWidth / 2);
+        const auto newLeftX = m_x - (renderedWidth / 2);
+
+        tft.fillRect(oldLeftX, m_y,
+                     newLeftX - oldLeftX,
+                     renderedHeight,
+                     bgcolor);
+
+        const auto oldRightX = m_x + (m_lastWidth / 2);
+        const auto newRightX = m_x + (renderedWidth / 2);
+
+        tft.fillRect(newRightX, m_y,
+                     oldRightX - newRightX,
+                     renderedHeight,
+                     bgcolor);
+    }
+
+//    if (renderedHeight < m_lastHeight)
+//        tft.fillRect(m_x, m_y + renderedHeight,
+//                     renderedWidth, m_lastHeight - renderedHeight,
+//                     bgcolor);
+
+    m_lastStr = str;
+    m_lastColor = color;
+    m_lastFont = font;
+
+    m_lastWidth = renderedWidth;
+    m_lastHeight = renderedHeight;
+}
+
+void CenteredLabel::clear(TftInterface &tft, uint16_t bgcolor)
+{
+    if (m_lastWidth || m_lastHeight)
+        tft.fillRect(m_x, m_y, m_lastWidth, m_lastHeight, bgcolor);
+
+    start(tft);
+}
+}

src/widgets/centeredlabel.h

@@ -0,0 +1,37 @@
+#pragma once
+
+// system includes
+#include <string>
+
+// forward declares
+namespace espgui {
+class TftInterface;
+class FontRenderer;
+} // namespace espgui
+
+namespace espgui {
+class CenteredLabel
+{
+public:
+    CenteredLabel(int x, int y);
+
+    int x() const { return m_x; }
+    int y() const { return m_y; }
+
+    void start(TftInterface &tft);
+    void redraw(TftInterface &tft, std::string_view str, uint16_t color, uint16_t bgcolor, uint8_t font, bool forceRedraw = false);
+    void redraw(TftInterface &tft, FontRenderer &fontRenderer, std::string_view str, uint16_t color, uint16_t bgcolor, uint8_t font, bool forceRedraw = false);
+    void clear(TftInterface &tft, uint16_t bgcolor);
+
+private:
+    const int m_x;
+    const int m_y;
+
+    std::string m_lastStr;
+    uint16_t m_lastColor;
+    uint8_t m_lastFont;
+
+    int m_lastWidth;
+    int m_lastHeight;
+};
+} // namespace espgui