Esempio n. 1
0
        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                // Since the cache is out-of-date, leave everything alone.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();
            }
        }