make stuff draw on expose events

otk/button.cc

@@ -57,12 +57,12 @@ void OtkButton::update(void)
 
     OtkFocusWidget::resize(ft.measureString(_text) + bevel * 2,
                            ft.height() + bevel * 2);
-    ft.drawString(getWindow(), bevel, bevel, *text_color, _text);
 
     OtkFocusWidget::update();
-  }
 
-  _dirty = false;
+    ft.drawString(getWindow(), bevel, bevel, *text_color, _text);
+  } else
+    OtkFocusWidget::update();
 }
 
 }

otk/button.hh

@@ -40,7 +40,7 @@ private:
   std::string _text;
   //OtkPixmap _pixmap;
   bool _pressed;
-  bool _dirty;
+//  bool _dirty;
 
   BTexture *_pressed_focus_tx;
   BTexture *_pressed_unfocus_tx;

otk/otk_test.cc

@@ -59,6 +59,8 @@ int main(void) {
     if (XPending(otk::OBDisplay::display)) {
       XEvent e;
       XNextEvent(otk::OBDisplay::display, &e);
+      if (e.type == Expose)
+        foo.expose(e.xexpose);
     } 
   }
 

otk/widget.cc

@@ -390,4 +390,16 @@ void OtkWidget::removeChild(OtkWidget *child)
     _children.erase(it);
 }
 
+void OtkWidget::expose(const XExposeEvent &e)
+{
+  if (e.window == _window) {
+    _dirty = true;
+    update();
+  } else {
+    OtkWidgetList::iterator it = _children.begin(), end = _children.end();
+    for (; it != end; ++it)
+      (*it)->expose(e);
+  }
+}
+
 }

otk/widget.hh

@@ -27,6 +27,8 @@ public:
 
   virtual void update(void);
 
+  void expose(const XExposeEvent &e);
+
   inline Window getWindow(void) const { return _window; }
   inline const OtkWidget *getParent(void) const { return _parent; }
   inline const OtkWidgetList &getChildren(void) const { return _children; }
@@ -124,6 +126,7 @@ private:
   bool _fixed_width;
   bool _fixed_height;
 
+protected:
   bool _dirty;
 };