Source release of Wolfenstein 3D Classic Platinum for iOS, 2.1

wolf3d/code/iphone/UITableViewScrolling.m

@@ -0,0 +1,74 @@
+/*
+ 
+ Copyright (C) 2009-2011 id Software LLC, a ZeniMax Media company. 
+
+ This file is part of the WOLF3D iOS v2.1 GPL Source Code. 
+
+ 
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+ 
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ 
+ */
+
+#import "UITableViewScrolling.h"
+#import <UIKit/UITableView.h>
+
+void UITableViewScrollingPageDown( UITableView * table, int totalRows ) {
+	// If the user taps the page down button, we want to scroll the table view so that the first
+	// non-visible row becomes visible. To do this, we can get the array of visible index paths,
+	// find the maximum row within the array, and scroll to the row just after that.
+	
+	NSArray* visibleIndexPaths = [table indexPathsForVisibleRows];
+	
+	int maxRow = 0;
+	
+	for ( NSIndexPath* path in visibleIndexPaths ) {
+		maxRow = maxRow < path.row ? path.row: maxRow;
+	}
+	
+	const int rowToMakeVisible = maxRow + 1;
+	
+	UITableViewScrollingScrollToRow( table,rowToMakeVisible, totalRows );
+}
+
+
+void UITableViewScrollingPageUp( UITableView * table, int totalRows ) {
+
+	// If the user taps the page up button, we want to scroll the table view so that the first
+	// non-visible row becomes visible. To do this, we can get the array of visible index paths,
+	// find the minimum row within the array, and scroll to the row just before that.
+	
+	NSArray* visibleIndexPaths = [table indexPathsForVisibleRows];
+	
+	int minRow = totalRows - 1;
+	
+	for ( NSIndexPath* path in visibleIndexPaths ) {
+		minRow = minRow < path.row ? minRow: path.row;
+	}
+	
+	const int rowToMakeVisible = minRow - 1;
+	
+	UITableViewScrollingScrollToRow( table,rowToMakeVisible, totalRows );
+}
+
+
+void UITableViewScrollingScrollToRow( UITableView * table, int row, int maxRow ) {
+	
+	const int clampedRowMax = row < maxRow? row: maxRow-1;
+	const int clampedRow = clampedRowMax < 0? 0: clampedRowMax;
+	
+	NSIndexPath* pathToMakeVisible = [NSIndexPath indexPathForRow:clampedRow inSection:0];
+	
+	[table scrollToRowAtIndexPath:pathToMakeVisible atScrollPosition:UITableViewScrollPositionNone animated:YES];
+}