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update a little

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Jonathan Blandford 2002-02-04 19:30:00 +00:00
parent 402f5b9d93
commit 6c02ea8eb3
1 changed files with 27 additions and 0 deletions
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27
docs/tree-column-sizing.txt
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@ -74,3 +74,30 @@ min_width <= max_width
(column != last visible column) => width == CLAMP (requested_width, min_width, max_width)
HOW THE VERTICAL OFFSET IS CALCULATED
(This has nothing to do with columns)
=====================================
The current offset of the tree is determined by:
tree_view->priv->dy
All motion/button/expose events take this as the offset when trying to
draw the tree. There are also two other related members:
tree_view->priv->top_row
tree_view->priv->top_row_dy
In general _gtk_rbtree_node_find_offset (tree_view->priv->top_row) +
tree_view->priv->top_row_dy is the same as tree_view->priv->dy.
We have the alternate method so we can update dy when the tree changes.
There are two functions:
gtk_tree_view_dy_to_top_row
and
gtk_tree_view_top_row_to_dy
They are called when the tree's confirmation changes, in order to sync
the value appropriately. Note that these two functions sometimes call
each other to negotiate a correct value if needed.