1 files changed, 133 insertions, 0 deletions
diff --git a/examples/widgets/widgets/charactermap/characterwidget.py b/examples/widgets/widgets/charactermap/characterwidget.py
new file mode 100644
index 000000000..0f01f9684
--- /dev/null
+++ b/examples/widgets/widgets/charactermap/characterwidget.py
@@ -0,0 +1,133 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+from textwrap import dedent
+
+from PySide6.QtCore import QSize, Qt, Slot, Signal
+from PySide6.QtGui import (QBrush, QFont, QFontDatabase, QFontMetrics,
+                           QPainter, QPen)
+from PySide6.QtWidgets import QToolTip, QWidget
+
+COLUMNS = 16
+
+
+class CharacterWidget(QWidget):
+
+    character_selected = Signal(str)
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        self._display_font = QFont()
+        self._last_key = -1
+        self._square_size = int(0)
+
+        self.calculate_square_size()
+        self.setMouseTracking(True)
+
+    @Slot(QFont)
+    def update_font(self, font):
+        self._display_font.setFamily(font.family())
+        self.calculate_square_size()
+        self.adjustSize()
+        self.update()
+
+    @Slot(str)
+    def update_size(self, fontSize):
+        self._display_font.setPointSize(int(fontSize))
+        self.calculate_square_size()
+        self.adjustSize()
+        self.update()
+
+    @Slot(str)
+    def update_style(self, fontStyle):
+        old_strategy = self._display_font.styleStrategy()
+        self._display_font = QFontDatabase.font(self._display_font.family(),
+                                                fontStyle,
+                                                self._display_font.pointSize())
+        self._display_font.setStyleStrategy(old_strategy)
+        self.calculate_square_size()
+        self.adjustSize()
+        self.update()
+
+    @Slot(bool)
+    def update_font_merging(self, enable):
+        if enable:
+            self._display_font.setStyleStrategy(QFont.PreferDefault)
+        else:
+            self._display_font.setStyleStrategy(QFont.NoFontMerging)
+        self.adjustSize()
+        self.update()
+
+    def calculate_square_size(self):
+        h = QFontMetrics(self._display_font, self).height()
+        self._square_size = max(16, 4 + h)
+
+    def sizeHint(self):
+        return QSize(COLUMNS * self._square_size,
+                     (65536 / COLUMNS) * self._square_size)
+
+    def _unicode_from_pos(self, point):
+        row = int(point.y() / self._square_size)
+        return row * COLUMNS + int(point.x() / self._square_size)
+
+    def mouseMoveEvent(self, event):
+        widget_position = self.mapFromGlobal(event.globalPosition().toPoint())
+        key = self._unicode_from_pos(widget_position)
+        c = chr(key)
+        family = self._display_font.family()
+        text = dedent(f'''
+                       <p>Character: <span style="font-size: 24pt; font-family: {family}">
+                       {c}</span><p>Value: 0x{key:x}
+                       ''')
+        QToolTip.showText(event.globalPosition().toPoint(), text, self)
+
+    def mousePressEvent(self, event):
+        if event.button() == Qt.LeftButton:
+            self._last_key = self._unicode_from_pos(event.position().toPoint())
+            if self._last_key != -1:
+                c = chr(self._last_key)
+                self.character_selected.emit(f"{c}")
+            self.update()
+        else:
+            super().mousePressEvent(event)
+
+    def paintEvent(self, event):
+        with QPainter(self) as painter:
+            self.render(event, painter)
+
+    def render(self, event, painter):
+        painter = QPainter(self)
+        painter.fillRect(event.rect(), QBrush(Qt.white))
+        painter.setFont(self._display_font)
+        redraw_rect = event.rect()
+        begin_row = int(redraw_rect.top() / self._square_size)
+        end_row = int(redraw_rect.bottom() / self._square_size)
+        begin_column = int(redraw_rect.left() / self._square_size)
+        end_column = int(redraw_rect.right() / self._square_size)
+        painter.setPen(QPen(Qt.gray))
+        for row in range(begin_row, end_row + 1):
+            for column in range(begin_column, end_column + 1):
+                x = int(column * self._square_size)
+                y = int(row * self._square_size)
+                painter.drawRect(x, y, self._square_size, self._square_size)
+
+        font_metrics = QFontMetrics(self._display_font)
+        painter.setPen(QPen(Qt.black))
+        for row in range(begin_row, end_row + 1):
+            for column in range(begin_column, end_column + 1):
+                key = int(row * COLUMNS + column)
+                painter.setClipRect(column * self._square_size,
+                                    row * self._square_size,
+                                    self._square_size, self._square_size)
+
+                if key == self._last_key:
+                    painter.fillRect(column * self._square_size + 1,
+                                     row * self._square_size + 1,
+                                     self._square_size, self._square_size, QBrush(Qt.red))
+
+                text = chr(key)
+                painter.drawText(column * self._square_size + (self._square_size / 2)
+                                 - font_metrics.horizontalAdvance(text) / 2,
+                                 row * self._square_size + 4 + font_metrics.ascent(),
+                                 text)