improved dirty chain detection

src/gui/Dialog.cxx

@@ -147,20 +147,15 @@ void Dialog::setPosition()
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-bool Dialog::isChainDirty() const
+void Dialog::setDirty()
 {
-  bool dirty = false;
+  _dirty = true;
+}
 
-  // Recursively check if dialog or any chick dialogs or widgets are dirty
-  Widget* w = _firstWidget;
-
-  while(w && !dirty)
-  {
-    dirty |= w->needsRedraw();
-    w = w->_next;
-  }
-
-  return dirty;
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Dialog::setDirtyChain()
+{
+  _dirtyChain = true;
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -440,6 +435,7 @@ void Dialog::drawDialog()
   if(isDirty())
   {
     //cerr << "*** draw dialog " << typeid(*this).name() << " ***" << endl;
+    cerr << "d";
 
     if(clearsBackground())
     {
@@ -458,7 +454,7 @@ void Dialog::drawDialog()
     }
     else {
       s.invalidate();
-      cerr << "invalidate " << typeid(*this).name() << endl;
+      //cerr << "invalidate " << typeid(*this).name() << endl;
     }
     if(hasBorder()) // currently only used by Dialog itself
       s.frameRect(_x, _y, _w, _h, kColor);
@@ -471,19 +467,6 @@ void Dialog::drawDialog()
 
   // Draw all children
   drawChain();
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void Dialog::drawChain()
-{
-  Widget* w = _firstWidget;
-
-  while(w)
-  {
-    if(w->needsRedraw())
-      w->draw();
-    w = w->_next;
-  }
 
   // Draw outlines for focused widgets
   // Don't change focus, since this will trigger lost and received
@@ -497,6 +480,23 @@ void Dialog::drawChain()
   }
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Dialog::drawChain()
+{
+  // Clear chain *before* drawing, because some widgets may set it again when
+  //   being drawn (e.g. RomListWidget)
+  clearDirtyChain();
+
+  Widget* w = _firstWidget;
+
+  while(w)
+  {
+    if(w->needsRedraw())
+      w->draw();
+    w = w->_next;
+  }
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Dialog::handleText(char text)
 {

src/gui/Dialog.hxx

@@ -62,12 +62,14 @@ class Dialog : public GuiObject
     virtual void saveConfig()  { }
     virtual void setDefaults() { }
 
-    void tick() override;
-    bool isChainDirty() const override;
+    void setDirty() override;
+    void setDirtyChain() override;
     void redraw(bool force = false);
     void drawChain() override;
     void render();
 
+    void tick() override;
+
     void addFocusWidget(Widget* w) override;
     void addToFocusList(WidgetArray& list) override;
     void addToFocusList(WidgetArray& list, TabWidget* w, int tabId);

src/gui/EditableWidget.cxx

@@ -73,7 +73,7 @@ void EditableWidget::tick()
     {
       _caretTimer = 0;
       _caretEnabled = !_caretEnabled;
-      _dirty = true;
+      setDirty();
     }
   }
   Widget::tick();

src/gui/GuiObject.hxx

@@ -92,10 +92,12 @@ class GuiObject : public CommandReceiver
 
     virtual bool isVisible() const = 0;
 
-    void setDirty() { _dirty = true; }
+    virtual void setDirty() = 0;
+    virtual void setDirtyChain() = 0;
     void clearDirty() { _dirty = false; }
+    void clearDirtyChain() { _dirtyChain = false; }
     bool isDirty() const { return _dirty; }
-    virtual bool isChainDirty() const = 0;
+    bool isChainDirty() const { return _dirtyChain; }
 
     // The GUI indicates if its underlying surface needs to be redrawn
     //  and then re-rendered
@@ -152,6 +154,7 @@ class GuiObject : public CommandReceiver
   protected:
     int         _x{0}, _y{0}, _w{0}, _h{0};
     bool        _dirty{false};
+    bool        _dirtyChain{false};
     uInt32      _flags{0};
 
     Widget*     _firstWidget{nullptr};

src/gui/Widget.cxx

@@ -52,20 +52,21 @@ Widget::~Widget()
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-bool Widget::isChainDirty() const
+void Widget::setDirty()
 {
-  bool dirty = false;
+  _dirty = true;
 
-  // Recursively check if widget or any child dialogs or widgets are dirty
-  Widget* w = _firstWidget;
+  // Inform the parent object that its children chain is dirty
+  _boss->setDirtyChain();
+}
 
-  while(w && !dirty)
-  {
-    dirty |= w->needsRedraw();
-    w = w->_next;
-  }
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Widget::setDirtyChain()
+{
+  _dirtyChain = true;
 
-  return dirty;
+  // Inform the parent object that its children chain is dirty
+  _boss->setDirtyChain();
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -98,7 +99,8 @@ void Widget::draw()
 
   if(isDirty())
   {
-    cerr << "  *** draw widget " << typeid(*this).name() << " ***" << endl;
+    //cerr << "  *** draw widget " << typeid(*this).name() << " ***" << endl;
+    cerr << "w";
 
     FBSurface& s = _boss->dialog().surface();
 
@@ -163,6 +165,10 @@ void Widget::draw()
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Widget::drawChain()
 {
+  // Clear chain *before* drawing, because some widgets may set it again when
+  //   being drawn (e.g. RomListWidget)
+  clearDirtyChain();
+
   Widget* w = _firstWidget;
 
   while(w)
@@ -508,7 +514,6 @@ void ButtonWidget::setBitmap(const uInt32* bitmap, int bmw, int bmh)
   _bmh = bmh;
   _bmw = bmw;
 
-  cerr << "setBitmap" << endl;
   setDirty();
 }
 

src/gui/Widget.hxx

@@ -70,7 +70,9 @@ class Widget : public GuiObject
     virtual bool handleEvent(Event::Type event) { return false; }
 
     void tick() override;
-    bool isChainDirty() const override;
+
+    void setDirty() override;
+    void setDirtyChain() override;
     void draw() override;
     void drawChain() override;
     void receivedFocus();