- Add untested code to SchedulableWidget, manually inheriting from a raw Gtk::Widget

and doing things by hand


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@819 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/cairo_elements.hh

@@ -26,7 +26,7 @@
 #include "backend/thread.hh"
 #include "backend/process.hh"
 
-#include <cairo/cairo.h>
+#include <cairo.h>
 
 namespace sgpem
 {

src/schedulables_widget.cc

@@ -24,6 +24,8 @@
 #include "backend/history.hh"
 #include "backend/simulation.hh"
 
+#include <gdkmm/window.h>
+
 #include <iostream>
 #include <memory>
 
@@ -31,12 +33,9 @@ using namespace sgpem;
 
 
 SchedulablesWidget::SchedulablesWidget()
-  : Gtk::DrawingArea(), _h(1), _buf(NULL)
+  : Glib::ObjectBase("sgpem_CairoWidget"), 
+		Gtk::Widget(), _h(1), _buf(NULL)
 {
-  // Add other events we want to manage (as mouse clicks)
-  // when needed
-  add_events(Gdk::EXPOSURE_MASK);
-
   // Register this observer:
   Simulation::get_instance().get_history().attach(*this);
 }
@@ -51,17 +50,14 @@ SchedulablesWidget::~SchedulablesWidget()
 void 
 SchedulablesWidget::update(const History& history)
 {
+	if(!is_realized())
+		return; // Nowhere to draw to.
+
   // Determine the final height before to start drawing
   unsigned int w = get_allocation().get_width();
   _h = calc_height(history);
   
-  // FIXME TO THE EXPERT: this assertion fails. 
+  // get_window() returns a null pointer
-  // is this important???
-  assert(is_drawable());
-  
-  // FIXME : write me using double buffering
-  // PROBLEM : get_window() seems to return a null pointer!!!
-  // I read on the web that get_window() returns a null pointer
   // if the widget has not been realized
   _buf = Gdk::Pixmap::create(get_window(), w, _h);
   cairo_t* ctx = gdk_cairo_create(_buf->gobj());
@@ -96,6 +92,37 @@ SchedulablesWidget::calc_height(const History& history) const
 }
 
 
+void 
+SchedulablesWidget::on_realize()
+{
+	set_flags(Gtk::REALIZED);
+	
+	// Add other events we want to manage (as mouse clicks)
+  // when needed
+  add_events(Gdk::EXPOSURE_MASK);
+
+	GdkWindowAttr attributes;
+
+	Gtk::Allocation alloc = get_allocation();
+
+	attributes.x = alloc.get_x();
+	attributes.y = alloc.get_y();
+	attributes.width = alloc.get_width();
+	attributes.height = alloc.get_height();
+	attributes.wclass = GDK_INPUT_OUTPUT;
+	attributes.visual = get_visual()->gobj();
+	attributes.colormap = get_colormap()->gobj();
+	
+	Glib::RefPtr<Gdk::Window> window = Gdk::Window::create(get_parent_window(),
+																												 &attributes,
+																												 GDK_WA_X | GDK_WA_Y | GDK_WA_COLORMAP |
+																												 GDK_WA_VISUAL | GDK_WA_WMCLASS);
+	set_window(window);
+	//	get_style()->attach(window);
+	window->set_user_data(gobj());
+	get_style()->set_background(window, Gtk::STATE_ACTIVE);
+}
+ 
 void 
 SchedulablesWidget::on_size_request(Gtk::Requisition* requisition)
 {
@@ -106,22 +133,31 @@ SchedulablesWidget::on_size_request(Gtk::Requisition* requisition)
 }
 
 
+void
+SchedulablesWidget::on_size_allocate(const Gtk::Allocation& allocation)
+{
+	set_allocation(allocation);
+	
+	if(is_realized())
+		get_window()->move_resize(allocation.get_x(), allocation.get_y(),
+															allocation.get_width(), allocation.get_height());
+}
+
+
 bool 
 SchedulablesWidget::on_expose_event(GdkEventExpose* event)
 {
-  const Gtk::Allocation& allocation = get_allocation();
+	if(!event || event->count > 0)
-  int width  = allocation.get_width();
+		return false;
-  int height = allocation.get_height();
+
+  // calculated dinamically:
+  set_size_request(get_allocation().get_width(), _h);
   
   // Clip to redraw only the smallest possible area
   std::auto_ptr<Gdk::Rectangle> clip_area;
-  if(event)
 	clip_area = std::auto_ptr<Gdk::Rectangle>(new Gdk::Rectangle(event->area.x, event->area.y,
 																															 event->area.width, event->area.height));
 
-  else
-    clip_area = std::auto_ptr<Gdk::Rectangle>(new Gdk::Rectangle(0, 0, width, height));
-
   // Use double buffering or we're CPU-dead
   // Copy from the buffer to the screen
   if(_buf)
@@ -130,9 +166,6 @@ SchedulablesWidget::on_expose_event(GdkEventExpose* event)
                                 clip_area->get_x(), clip_area->get_y(),
                                 clip_area->get_width(), clip_area->get_height());
 
-  // calculated dinamically:
-  set_size_request(width, _h);
-  
   return true; 
 }
  

src/schedulables_widget.hh

@@ -25,13 +25,13 @@
 
 #include "backend/history_observer.hh"
 
-#include <cairo/cairo.h>
+#include <cairo.h>
-#include <gtkmm/drawingarea.h>
+#include <gtkmm/widget.h>
 #include <gdkmm/pixmap.h>
 
 namespace sgpem
 {
-  class SchedulablesWidget : public Gtk::DrawingArea, public HistoryObserver
+  class SchedulablesWidget : public Gtk::Widget, public HistoryObserver
   {
   public:
     SchedulablesWidget();
@@ -40,6 +40,8 @@ namespace sgpem
     void update(const History& history);
 
   protected:
+		virtual void on_realize();
+		virtual void on_size_allocate(const Gtk::Allocation& allocation);
     virtual void on_size_request(Gtk::Requisition* requisition);
     virtual bool on_expose_event(GdkEventExpose* event);
     virtual bool on_button_press_event(GdkEventButton* event);