CE-Programming · adriweb · Oct 8, 2025 · Oct 8, 2025
diff --git a/gui/qt/debugger.cpp b/gui/qt/debugger.cpp
@@ -2023,6 +2023,7 @@ HexWidget *MainWindow::gotoMemAddrNoRaise(uint32_t address) {
             const int offset = static_cast<int>(address - edit->getBase());
             if (offset < edit->getSize()) {
                 edit->setOffset(offset);
+                edit->setHighlight(static_cast<int>(address));
                 memWidget = edit;
                 didGoto = true;
                 break;
@@ -2037,6 +2038,8 @@ HexWidget *MainWindow::gotoMemAddrNoRaise(uint32_t address) {
     }
     if (memWidget != Q_NULLPTR && !didGoto) {
         memGoto(memWidget, address);
+    } else if (memWidget != Q_NULLPTR) {
+        memWidget->setHighlight(static_cast<int>(address));
     }
     return memWidget;
 }

diff --git a/gui/qt/debugger/hexwidget.cpp b/gui/qt/debugger/hexwidget.cpp
@@ -131,6 +131,19 @@ void HexWidget::setOffset(int offset) {
 }
 
 void HexWidget::setCursorOffset(int offset, bool selection) {
+    setCursorOffset(offset, selection, true);
+}
+
+void HexWidget::setHighlight(const int address) {
+    const int normalized = address < 0 ? -1 : address;
+    if (m_highlightedAddr == normalized) {
+        return;
+    }
+    m_highlightedAddr = normalized;
+    viewport()->update();
+}
+
+void HexWidget::setCursorOffset(int offset, bool selection, bool clearHighlight) {
     if (offset > m_size * 2) {
         offset = m_size * 2;
     }
@@ -141,6 +154,10 @@ void HexWidget::setCursorOffset(int offset, bool selection) {
         resetSelection();
     }
 
+    if (clearHighlight) {
+        m_highlightedAddr = -1;
+    }
+
     m_cursorOffset = offset;
     adjust();
     showCursor();
@@ -254,18 +271,19 @@ void HexWidget::setSelection(int addr) {
         addr = 0;
     }
 
-    if (m_selectStart == -1) {
-        m_selectStart = addr;
-        m_selectEnd = addr;
-        m_selectLen = 0;
+    if (m_selectAnchor == -1) {
+        m_selectAnchor = addr;
     }
-    if (addr > m_selectStart) {
+
+    if (addr >= m_selectAnchor) {
+        m_selectStart = m_selectAnchor;
         m_selectEnd = addr;
-        m_selectLen = addr - m_selectStart + 1;
     } else {
         m_selectStart = addr;
-        m_selectLen = m_selectEnd - addr + 1;
+        m_selectEnd = m_selectAnchor;
     }
+
+    m_selectLen = (m_selectStart == -1 || m_selectEnd == -1) ? 0 : (m_selectEnd - m_selectStart + 1);
 }
 
 void HexWidget::undo() {
@@ -310,12 +328,27 @@ void HexWidget::paintEvent(QPaintEvent *event) {
     const QColor &cSelected = pal.color(QPalette::Highlight);
     const QColor cModified = QColor(Qt::blue).lighter(160);
     const QColor cBoth = QColor(Qt::green).lighter(160);
+    const bool darkMode = isRunningInDarkMode();
+    const QColor boxBorder = darkMode ? QColor(0xdb, 0xdb, 0xdb) : QColor(0x66, 0x66, 0x66);
+    QColor boxFill = darkMode ? QColor(0x55, 0x55, 0x55) : QColor(0xd0, 0xd0, 0xd0);
+    boxFill.setAlpha(140);
     const int xOffset = horizontalScrollBar()->value();
     const int xAddr = m_addrLoc - xOffset;
 
     painter.setRenderHint(QPainter::Antialiasing);
     painter.fillRect(region, cBg);
 
+    const auto drawHighlightBox = [&](const QRect &rect) {
+        if (!rect.isValid() || rect.isNull()) {
+            return;
+        }
+        painter.save();
+        painter.setPen(QPen(boxBorder, 1));
+        painter.setBrush(boxFill);
+        painter.drawRoundedRect(rect.adjusted(0, 0, -1, -1), 2, 2);
+        painter.restore();
+    };
+
     painter.setPen(Qt::gray);
     painter.drawLine(m_dataLine - xOffset, region.top(), m_dataLine - xOffset, height());
     if (m_asciiArea) {
@@ -338,6 +371,22 @@ void HexWidget::paintEvent(QPaintEvent *event) {
             uint8_t flags = debug.addr[addr + m_base];
             bool selected = addr >= m_selectStart && addr <= m_selectEnd;
             bool modified = !m_modified.isEmpty() && m_modified[addr];
+            const bool highlighted = m_highlightedAddr >= 0 && (m_base + addr) == m_highlightedAddr;
+            const int xDataStart = xData;
+            const int xAsciiStart = xAscii;
+            QRect dataHighlightRect;
+            QRect asciiHighlightRect;
+
+            if (highlighted) {
+                if (!col) {
+                    dataHighlightRect.setRect(xDataStart, y - m_charHeight + m_margin, 2 * m_charWidth + 3, m_charHeight);
+                } else {
+                    dataHighlightRect.setRect(xDataStart - m_charWidth, y - m_charHeight + m_margin, 3 * m_charWidth + 3, m_charHeight);
+                }
+                if (m_asciiArea) {
+                    asciiHighlightRect.setRect(xAsciiStart, y - m_charHeight + m_margin, m_charWidth + 1, m_charHeight);
+                }
+            }
 
             QFont font = painter.font();
             const QFont fontorig = painter.font();
@@ -367,6 +416,10 @@ void HexWidget::paintEvent(QPaintEvent *event) {
                 painter.fillRect(r, modified ? selected ? cBoth : cModified : cSelected);
             }
 
+            if (highlighted) {
+                drawHighlightBox(dataHighlightRect);
+            }
+
             QString hex = int2hex(data, 2);
             if ((flags & DBG_MASK_READ) && (flags & DBG_MASK_WRITE)) {
                 painter.setPen(Qt::darkGreen);
@@ -391,6 +444,9 @@ void HexWidget::paintEvent(QPaintEvent *event) {
                     r.setRect(xAscii, y - m_charHeight + m_margin, m_charWidth, m_charHeight);
                     painter.fillRect(r, modified ? selected ? cBoth : cModified : cSelected);
                 }
+                if (highlighted) {
+                    drawHighlightBox(asciiHighlightRect);
+                }
                 painter.drawText(xAscii, y, QChar(ch));
                 xAscii += m_charWidth;
             }
@@ -421,6 +477,9 @@ void HexWidget::mousePressEvent(QMouseEvent *event) {
     int addr = getPosition(event->pos());
     if (addr >= 0) {
         setCursorOffset(addr, true);
+        m_selectAnchor = addr / 2;
+        m_selectStart = m_selectEnd = -1;
+        m_selectLen = 0;
     }
 }
 

diff --git a/gui/qt/debugger/hexwidget.h b/gui/qt/debugger/hexwidget.h
@@ -17,6 +17,7 @@ class HexWidget : public QAbstractScrollArea {
     void setBytesPerLine(int bytes) { m_bytesPerLine = bytes; adjust(); }
     void setAsciiArea(bool area) { m_asciiArea = area; adjust(); }
     void setCursorOffset(int address, bool selection = true);
+    void setHighlight(int address);
     void setScrollable(bool state) { m_scrollable = state; adjust(); }
     void setFont(const QFont &font) { QAbstractScrollArea::setFont(font); adjust(); }
     void setOffset(int addr);
@@ -52,11 +53,12 @@ private slots:
     void scroll(int value);
 
 private:
+    void setCursorOffset(int offset, bool selection, bool clearHighlight);
     void redo();
     void undo();
     void showCursor();
     void setSelection(int addr);
-    void resetSelection() { m_selectStart = m_selectEnd = -1; }
+    void resetSelection() { m_selectStart = m_selectEnd = -1; m_selectLen = 0; m_selectAnchor = -1; }
     bool isSelected() const { return m_selectStart != -1; }
     void setSelected(char n) { overwrite(m_selectStart * 2, QByteArray(m_selectLen, n)); }
     void overwrite(int pos, char c);
@@ -98,11 +100,13 @@ private slots:
     int m_selectStart;
     int m_selectEnd;
     int m_selectLen;
+    int m_selectAnchor = -1;
 
     bool m_scrollable = false;          // fetch bytes from memory on scroll
     bool m_asciiArea = true;            // show character representations
     bool m_scrolled = false;            // scrolled while focused
     bool m_asciiEdit = false;           // editing from the ascii side
+    int m_highlightedAddr = -1;         // Address to highlight with a box
 
     QStack<stack_entry_t> m_stack;
 };

diff --git a/gui/qt/memorywidget.cpp b/gui/qt/memorywidget.cpp
@@ -208,6 +208,7 @@ void MainWindow::memGoto(HexWidget *edit, uint32_t address) {
     edit->setBase(static_cast<int>(address));
     edit->setOffset(0);
     memUpdateEdit(edit, true);
+    edit->setHighlight(static_cast<int>(address));
 }
 
 void MainWindow::memGotoEdit(HexWidget *edit) {