Prepare the wiggly widget example for use in Designer

Refactor and brush up the code to C++/Python naming conventions.
Turn text/running into properties.
Most importantly, fix it to not crash when the text initially
is empty.

Task-number: PYSIDE-1455
Task-number: PYSIDE-841
Change-Id: If94558a453b1824ba54bd4f94808ced5798b2dc3
Reviewed-by: Christian Tismer <tismer@stackless.com>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 34 insertions, 15 deletions

diff --git a/examples/widgetbinding/wigglywidget.py b/examples/widgetbinding/wigglywidget.py
index 5451b2320..21a955dd1 100644
--- a/examples/widgetbinding/wigglywidget.py
+++ b/examples/widgetbinding/wigglywidget.py
@@ -48,7 +48,7 @@
 ##
 ############################################################################
 
-from PySide6.QtCore import QBasicTimer
+from PySide6.QtCore import QBasicTimer, Property
 from PySide6.QtGui import QColor, QFontMetrics, QPainter, QPalette
 from PySide6.QtWidgets import QWidget
 
@@ -56,19 +56,31 @@ from PySide6.QtWidgets import QWidget
 class WigglyWidget(QWidget):
     def __init__(self, parent=None):
         super(WigglyWidget, self).__init__(parent)
-        self.step = 0
-        self.text = ""
+        self._step = 0
+        self._text = ""
         self.setBackgroundRole(QPalette.Midlight)
         self.setAutoFillBackground(True)
 
-        newFont = self.font()
-        newFont.setPointSize(newFont.pointSize() + 20)
-        self.setFont(newFont)
+        new_font = self.font()
+        new_font.setPointSize(new_font.pointSize() + 20)
+        self.setFont(new_font)
+        self._timer = QBasicTimer()
 
-        self.timer = QBasicTimer()
-        self.timer.start(60, self)
+    def isRunning(self):
+        return self._timer.isActive()
+
+    def setRunning(self, r):
+        if r == self.isRunning():
+            return
+        if r:
+            self._timer.start(60, self)
+        else:
+            self._timer.stop()
 
     def paintEvent(self, event):
+        if not self._text:
+            return
+
         sineTable = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100,
                      -92, -71, -38]
 
@@ -79,19 +91,26 @@ class WigglyWidget(QWidget):
 
         painter = QPainter(self)
         for i in range(len(self.text)):
-            index = (self.step + i) % 16
+            index = (self._step + i) % 16
             color.setHsv((15 - index) * 16, 255, 191)
             painter.setPen(color)
-            painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
-                             str(self.text[i]))
-            x += metrics.horizontalAdvance(self.text[i])
+            dy = (sineTable[index] * metrics.height()) / 400
+            c = self._text[i]
+            painter.drawText(x, y - dy, str(c))
+            x += metrics.horizontalAdvance(c)
 
     def timerEvent(self, event):
-        if event.timerId() == self.timer.timerId():
-            self.step += 1
+        if event.timerId() == self._timer.timerId():
+            self._step += 1
             self.update()
         else:
             QWidget.timerEvent(event)
 
+    def text(self):
+        return self._text
+
     def setText(self, text):
-        self.text = text
+        self._text = text
+
+    running = Property(bool, isRunning, setRunning)
+    text = Property(str, text, setText)