private static void UpdateGrid(Grid grid, GridSplitter gridSplitter, bool isVisible)
{
// Get the definitions of interest. These include the splitter's and its neighbors.
var index = gridSplitter.GetIndex();
var definitions = grid.GetDefinitions(gridSplitter);
var splitterDefinition = definitions.ElementAt(index);
var previousDefinition = definitions.ElementAt(gridSplitter.GetPreviousIndex(index));
var nextDefinition = definitions.ElementAt(gridSplitter.GetNextIndex(index));
var gridLengthsCache = GetGridSplitterLengthsCache(grid);
if (gridLengthsCache == null)
{
// No cache, so create and store one.
gridLengthsCache = new WeakKeyDictionary <DefinitionBase, GridLength>();
SetGridSplitterLengthsCache(grid, gridLengthsCache);
}
if (gridLengthsCache.ContainsKey(splitterDefinition) && gridLengthsCache.ContainsKey(previousDefinition) && gridLengthsCache.ContainsKey(nextDefinition))
{
if (isVisible)
{
// Restore to cached size.
splitterDefinition.SetLength(gridLengthsCache[splitterDefinition]);
previousDefinition.SetLength(gridLengthsCache[previousDefinition]);
nextDefinition.SetLength(gridLengthsCache[nextDefinition]);
}
else
{
// Ensure collapsed. Update the cached sizes if necessary.
splitterDefinition.HideDefinitionAndCacheLength(gridLengthsCache);
previousDefinition.HideDefinitionAndCacheLength(gridLengthsCache);
nextDefinition.HideDefinitionAndCacheLength(gridLengthsCache);
}
}
else
{
// We haven't cached the GridLength values, or at least one of the cached definitions somehow went bad. Store the current values.
// Since the cache is out-of-date, leave everything alone.
gridLengthsCache[splitterDefinition] = splitterDefinition.GetLength();
gridLengthsCache[previousDefinition] = previousDefinition.GetLength();
gridLengthsCache[nextDefinition] = nextDefinition.GetLength();
}
}