Advanced MFC Programming

Chapter 3. Splitter Window
Split box
Split box
Figure 3-3. Double clicking on any of the split boxes will divide
the window into panes dynamically
This behavior could be customized. For example, sometimes by double clicking on the split bar, we
want to resize the two panes instead of deleting one of them. This feature gives the user much convenience
for changing the size of each pane bit by bit.
Split bar
Figure 3-4. Double clicking on the split bar will delete one of the
two panes divided by the split bar
Splitter Window Layout
We need to override the following two member functions of class CSplitterWnd in order to implement
this feature: CSplitterWnd::DeleteRow(…) and CSplitterWnd::DeleteColumn(…). When the user double
clicks on the split bar, one of the two functions will be called to delete a row or column dynamically. In
order to customize this behavior, after the split bar is clicked, we can first change the size of each pane,
then judge if the size of one pane is smaller than its minimum size. If so, we call the default implementation
of the corresponding function to delete one row or column.
To change a pane’s size, we need to call function CSplitterWnd::SetColumnInfo(…) and
CSplitterWnd::SetRowInfo(…). The current size of a pane could be obtained by their counterpart
functions CSplitterWnd::GetColumnInfo(…) and CSplitterWnd::GetRowInfo(…). The following shows
the formats of the above four functions:
void CSplitterWnd::SetColumnInfo(int col, int cxIdeal, int cxMin);
void CSplitterWnd::SetRowInfo(int row, int cyIdeal, int cyMin);
void CSplitterWnd::GetColumnInfo(int col, int& cxCur, int& cxMin);
void CSplitterWnd::GetRowInfo(int row, int& cyCur, int& cyMin);
62