+namespace
+{
+
+// This is a common part of SetRowSize() and SetColSize() which takes care of
+// updating the height/width of a row/column depending on its current value and
+// the new one.
+//
+// Returns the difference between the new and the old size.
+int UpdateRowOrColSize(int& sizeCurrent, int sizeNew)
+{
+ // On input here sizeCurrent can be negative if it's currently hidden (the
+ // real size is its absolute value then). And sizeNew can be 0 to indicate
+ // that the row/column should be hidden or -1 to indicate that it should be
+ // shown again.
+
+ if ( sizeNew < 0 )
+ {
+ // We're showing back a previously hidden row/column.
+ wxASSERT_MSG( sizeNew == -1, wxS("New size must be positive or -1.") );
+
+ // If it's already visible, simply do nothing.
+ if ( sizeCurrent >= 0 )
+ return 0;
+
+ // Otherwise show it by restoring its old size.
+ sizeCurrent = -sizeCurrent;
+
+ // This is positive which is correct.
+ return sizeCurrent;
+ }
+ else if ( sizeNew == 0 )
+ {
+ // We're hiding a row/column.
+
+ // If it's already hidden, simply do nothing.
+ if ( sizeCurrent <= 0 )
+ return 0;
+
+ // Otherwise hide it and also remember the shown size to be able to
+ // restore it later.
+ sizeCurrent = -sizeCurrent;
+
+ // This is negative which is correct.
+ return sizeCurrent;
+ }
+ else // We're just changing the row/column size.
+ {
+ // Here it could have been hidden or not previously.
+ const int sizeOld = sizeCurrent < 0 ? 0 : sizeCurrent;
+
+ sizeCurrent = sizeNew;
+
+ return sizeCurrent - sizeOld;
+ }
+}
+
+} // anonymous namespace
+
projects / wxWidgets.git / blobdiff