Allow clicking on a date in the Statistics heatmap and have it open that page

bouquin/main_window.py

@@ -1163,6 +1163,14 @@ class MainWindow(QMainWindow):
             return
 
         dlg = StatisticsDialog(self.db, self)
+
+        if hasattr(dlg, "_heatmap"):
+
+            def on_date_clicked(d: datetime.date):
+                qd = QDate(d.year, d.month, d.day)
+                self._open_date_in_tab(qd)
+
+            dlg._heatmap.date_clicked.connect(on_date_clicked)
         dlg.exec()
 
     # ------------ Window positioning --------------- #

bouquin/statistics_dialog.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import datetime as _dt
 from typing import Dict
 
-from PySide6.QtCore import Qt, QSize
+from PySide6.QtCore import Qt, QSize, Signal
 from PySide6.QtGui import QColor, QPainter, QPen, QBrush
 from PySide6.QtWidgets import (
     QDialog,
@@ -32,6 +32,8 @@ class DateHeatmap(QWidget):
     Data is a mapping: datetime.date -> integer value.
     """
 
+    date_clicked = Signal(_dt.date)
+
     def __init__(self, parent=None):
         super().__init__(parent)
         self._data: Dict[_dt.date, int] = {}
@@ -192,6 +194,46 @@ class DateHeatmap(QWidget):
 
         painter.end()
 
+    def mousePressEvent(self, event):
+        if event.button() != Qt.LeftButton:
+            return super().mousePressEvent(event)
+
+        # No data = nothing to click
+        if not self._start or not self._end:
+            return
+
+        # Qt6: position(), older: pos()
+        pos = event.position() if hasattr(event, "position") else event.pos()
+        x = pos.x()
+        y = pos.y()
+
+        # Outside grid area (left of weekday labels or above rows)
+        if x < self._margin_left or y < self._margin_top:
+            return
+
+        cell_span = self._cell + self._gap
+        col = int((x - self._margin_left) // cell_span)  # week index
+        row = int((y - self._margin_top) // cell_span)  # dow (0..6)
+
+        # Only 7 rows (Mon–Sun)
+        if not (0 <= row < 7):
+            return
+
+        # Only as many weeks as we actually have
+        day_count = (self._end - self._start).days + 1
+        weeks = (day_count + 6) // 7
+        if col < 0 or col >= weeks:
+            return
+
+        idx = col * 7 + row
+        date = self._start + _dt.timedelta(days=idx)
+
+        # Skip trailing empty cells beyond the last date
+        if date > self._end:
+            return
+
+        self.date_clicked.emit(date)
+
 
 # ---------- Statistics dialog itself ----------