[escher] create TransparentView

escher/Makefile

@@ -75,6 +75,7 @@ objs += $(addprefix escher/src/,\
   timer.o\
   toolbox.o\
   toolbox_message_tree.o\
+  transparent_view.o\
   view.o\
   view_controller.o\
   warning_controller.o\

escher/include/escher.h

@@ -77,6 +77,7 @@
 #include <escher/timer.h>
 #include <escher/toolbox.h>
 #include <escher/toolbox_message_tree.h>
+#include <escher/transparent_view.h>
 #include <escher/view.h>
 #include <escher/view_controller.h>
 #include <escher/warning_controller.h>

escher/include/escher/transparent_view.h

@@ -0,0 +1,11 @@
+#ifndef ESCHER_TRANSPARENT_VIEW_H
+#define ESCHER_TRANSPARENT_VIEW_H
+
+#include <escher/view.h>
+
+class TransparentView : public View {
+public:
+  void markRectAsDirty(KDRect rect) override;
+};
+
+#endif

escher/include/escher/view.h

@@ -23,6 +23,7 @@ class Window;
 class View {
   // We only want Window to be able to invoke View::redraw
   friend class Window;
+  friend class TransparentView;
 public:
   View();
   virtual ~View();
@@ -58,7 +59,7 @@ protected:
    *  - Moving a cursor -> In that case, there's really a much more efficient way
    *  - ... and that's all I can think of.
    */
-  void markRectAsDirty(KDRect rect);
+  virtual void markRectAsDirty(KDRect rect);
 #if ESCHER_VIEW_LOGGING
   virtual const char * className() const;
   virtual void logAttributes(std::ostream &os) const;

escher/src/transparent_view.cpp

@@ -0,0 +1,8 @@
+#include <escher/transparent_view.h>
+
+void TransparentView::markRectAsDirty(KDRect rect) {
+  if (m_superview) {
+    m_superview->markRectAsDirty(KDRect(m_superview->pointFromPointInView(this, rect.origin()), rect.size()));
+  }
+  View::markRectAsDirty(rect);
+}