- * class implements optimized logic for refreshing
- * areas of frame layout - which actually need to be updated.
- * Is used as default updates-manager by wxFrameLayout.
- *
- * it is called "Garbage Collecting" u.mgr for it's implementation
- * tries to find out dependencies between bars, and to order
- * them ito "hierarchy", this hierarchical sorting resembles
- * implemenation of heap-garbage collectors, which resolve
- * dependencies between references.
- *
- * Example: there are situations where the order of moving
- * the windows does matter:
- *
- * case 1)
- * ------ ---
- * | A | |B|
- * ------ ---> | |
- * --- --- ------
- * |B| | A |
- * | | ------
- * ---
- * (future)
- * (past)
- *
- * past/future positions of A and B windows completely overlapp, i.e.
- * depend on each other, and there is not solution for
- * moving the windows witout refreshing both of them,
- * -- we have cyclic dependency here. The gc. alg will
- * find this cyclic dependecy and will force "refresh"
- * after movement.
- *
- * case 2)
- *
- * ------
- * | A |
- * ------ --->
- * ---
- * |B| ------
- * | | | A |
- * --- ------
- * ---
- * |B|
- * | |
- * ---
- *
- * (future)
- * (past)
- *
- * in this case past/future positions do not overlapp, thus
- * it's enough only to move windows, without refreshing them.
- * GC will "notice" it.
- *
- * there is also third case, when overlapping is partial
- * in this case the refershing can be also avoided by
- * moving windows in the order of "most-dependant" towards the
- * "least-dependent". GC handles this automatically, by
- * sorting windows by their dependency-level (or "hierarchy")
- *
- * See garbagec.h for more details of this method, garbagec.h/cpp
- * implement sorting of generic-dependencies (does not deal
- * with graphical objects directly)
- *
- * Summary: improves performance when complex/large windows are
- * moved around, by reducing number of repaints. Also helps
- * to avoid dirty non-client areas of moved windows
- * in some special cases of "overlapping anomalies"
- */
-
-class cbGCUpdatesMgr : public cbSimpleUpdatesMgr
+This class implements optimized logic for refreshing
+the areas of frame layout that actually need to be updated.
+It is used as the default updates manager by wxFrameLayout.
+
+It is called 'Garbage Collecting' updates manager because
+its implementation tries to find out dependencies between bars,
+and to order them into a 'hierarchy'. This hierarchical sorting resembles
+the implementation of heap-garbage collectors, which resolve
+dependencies between references.
+
+Example: there are situations where the order in which the user
+moves windows does matter.
+
+\begin{verbatim}
+ case 1)
+ ------ ---
+ | A | |B|
+ ------ ---> | |
+ --- --- ------
+ |B| | A |
+ | | ------
+ ---
+ (future)
+ (past)
+\end{verbatim}
+
+Past/future positions of A and B windows completely overlap, i.e.
+depend on each other, and there is no solution for
+moving the windows without refreshing both of them
+-- we have a cyclic dependency here. The garbage collection algorithm will
+find this cyclic dependecy and will force refresh after movement.
+
+\begin{verbatim}
+ case 2)
+
+ ------
+ | A |
+ ------ --->
+ ---
+ |B| ------
+ | | | A |
+ --- ------
+ ---
+ |B|
+ | |
+ ---
+
+ (future)
+ (past)
+\end{verbatim}
+
+In this case past/future positions do not overlap, so
+it is enough only to move windows without refreshing them.
+Garbage collection will 'notice' this.
+
+There is also a third case, when overlapping is partial.
+In this case the refreshing can also be avoided by
+moving windows in the order of 'most-dependant' towards the
+'least-dependent'. GC handles this automatically, by
+sorting windows by their dependency-level (or 'hierarchy').
+
+See garbagec.h for more details of this method; garbagec.h/cpp
+implement sorting of generic dependencies and does not deal
+with graphical objects directly.
+
+Summary: garbage collection improves performance when complex or large
+windows are moved around, by reducing the number of repaints. It also helps
+to avoid dirty non-client areas of moved windows
+in some special cases of 'overlapping anomalies'.
+*/
+
+class WXDLLIMPEXP_FL cbGCUpdatesMgr : public cbSimpleUpdatesMgr
projects / wxWidgets.git / blobdiff