Fix the history view's horizontal split view

Save the position correctly (it wasn't saving before). Restore the position sometime after awakeFromNib otherwise the superview's size will not have been set yet.

Also constrain the divider from moving unless the lower view is too small.

PBGitHistoryController.m

@@ -30,11 +30,14 @@
 #define kHistoryDetailViewIndex 0
 #define kHistoryTreeViewIndex 1
 
+#define kHistorySplitViewPositionDefault @"History SplitView Position"
+
 @interface PBGitHistoryController ()
 
 - (void) updateBranchFilterMatrix;
 - (void) restoreFileBrowserSelection;
 - (void) saveFileBrowserSelection;
+- (void)saveSplitViewPosition;
 
 @end
 
@@ -77,13 +80,14 @@
 	[[commitList tableColumnWithIdentifier:@"SubjectColumn"] setSortDescriptorPrototype:[[NSSortDescriptor alloc] initWithKey:@"subject" ascending:YES]];
 	// Add a menu that allows a user to select which columns to view
 	[[commitList headerView] setMenu:[self tableColumnMenu]];
+
 	[historySplitView setTopMin:58.0 andBottomMin:100.0];
-	[historySplitView uncollapse];
+	[historySplitView setHidden:YES];
+	[self performSelector:@selector(restoreSplitViewPositiion) withObject:nil afterDelay:0];
 
 	[upperToolbarView setTopShade:237/255.0 bottomShade:216/255.0];
 	[scopeBarView setTopColor:[NSColor colorWithCalibratedHue:0.579 saturation:0.068 brightness:0.898 alpha:1.000] 
 				  bottomColor:[NSColor colorWithCalibratedHue:0.579 saturation:0.119 brightness:0.765 alpha:1.000]];
-	//[scopeBarView setTopShade:207/255.0 bottomShade:180/255.0];
 	[self updateBranchFilterMatrix];
 
 	[super awakeFromNib];
@@ -419,13 +423,6 @@
 	[self updateKeys];
 }
 
-- (void)viewLoaded
-{
-	float position = [[NSUserDefaults standardUserDefaults] floatForKey:@"PBGitSplitViewPosition"];
-	if (position)
-		[historySplitView setPosition:position ofDividerAtIndex:0];
-}
-
 - (NSResponder *)firstResponder;
 {
 	return commitList;
@@ -488,9 +485,7 @@
 
 - (void)closeView
 {
-	float position = [[[historySplitView subviews] objectAtIndex:0] frame].size.height;
-	[[NSUserDefaults standardUserDefaults] setFloat:position forKey:@"PBGitSplitViewPosition"];
-	[[NSUserDefaults standardUserDefaults] synchronize];
+	[self saveSplitViewPosition];
 
 	if (commitController) {
 		[commitController removeObserver:self forKeyPath:@"selection"];
@@ -620,12 +615,17 @@
 	return menuItems;
 }
 
-- (BOOL)splitView:(NSSplitView *)sender canCollapseSubview:(NSView *)subview {
+
+#pragma mark NSSplitView delegate methods
+
+- (BOOL)splitView:(NSSplitView *)splitView canCollapseSubview:(NSView *)subview
+{
 	return TRUE;
 }
 
-- (BOOL)splitView:(NSSplitView *)splitView shouldCollapseSubview:(NSView *)subview forDoubleClickOnDividerAtIndex:(NSInteger)dividerIndex {
-	int index = [[splitView subviews] indexOfObject:subview];
+- (BOOL)splitView:(NSSplitView *)splitView shouldCollapseSubview:(NSView *)subview forDoubleClickOnDividerAtIndex:(NSInteger)dividerIndex
+{
+	NSUInteger index = [[splitView subviews] indexOfObject:subview];
 	// this method (and canCollapse) are called by the splitView to decide how to collapse on double-click
 	// we compare our two subviews, so that always the smaller one is collapsed.
 	if([[[splitView subviews] objectAtIndex:index] frame].size.height < [[[splitView subviews] objectAtIndex:((index+1)%2)] frame].size.height) {
@@ -634,14 +634,59 @@
 	return FALSE;
 }
 
-- (CGFloat)splitView:(NSSplitView *)sender constrainMinCoordinate:(CGFloat)proposedMin ofSubviewAt:(NSInteger)offset {
-	return proposedMin + historySplitView.topViewMin;
+- (CGFloat)splitView:(NSSplitView *)splitView constrainMinCoordinate:(CGFloat)proposedMin ofSubviewAt:(NSInteger)dividerIndex
+{
+	return historySplitView.topViewMin;
 }
 
-- (CGFloat)splitView:(NSSplitView *)sender constrainMaxCoordinate:(CGFloat)proposedMax ofSubviewAt:(NSInteger)offset {
-	if(offset == 1)
-		return proposedMax - historySplitView.bottomViewMin;
-	return [sender frame].size.height;
+- (CGFloat)splitView:(NSSplitView *)splitView constrainMaxCoordinate:(CGFloat)proposedMax ofSubviewAt:(NSInteger)dividerIndex
+{
+	return [splitView frame].size.height - [splitView dividerThickness] - historySplitView.bottomViewMin;
+}
+
+// while the user resizes the window keep the upper (history) view constant and just resize the lower view
+// unless the lower view gets too small
+- (void)splitView:(NSSplitView *)splitView resizeSubviewsWithOldSize:(NSSize)oldSize
+{
+	NSRect newFrame = [splitView frame];
+
+	float dividerThickness = [splitView dividerThickness];
+
+	NSView *upperView = [[splitView subviews] objectAtIndex:0];
+	NSRect upperFrame = [upperView frame];
+	upperFrame.size.width = newFrame.size.width;
+
+	if ((newFrame.size.height - upperFrame.size.height - dividerThickness) < historySplitView.bottomViewMin) {
+		upperFrame.size.height = newFrame.size.height - historySplitView.bottomViewMin - dividerThickness;
+	}
+
+	NSView *lowerView = [[splitView subviews] objectAtIndex:1];
+	NSRect lowerFrame = [lowerView frame];
+	lowerFrame.origin.y = upperFrame.size.height + dividerThickness;
+	lowerFrame.size.height = newFrame.size.height - lowerFrame.origin.y;
+	lowerFrame.size.width = newFrame.size.width;
+
+	[upperView setFrame:upperFrame];
+	[lowerView setFrame:lowerFrame];
+}
+
+// NSSplitView does not save and restore the position of the SplitView correctly so do it manually
+- (void)saveSplitViewPosition
+{
+	float position = [[[historySplitView subviews] objectAtIndex:0] frame].size.height;
+	[[NSUserDefaults standardUserDefaults] setFloat:position forKey:kHistorySplitViewPositionDefault];
+	[[NSUserDefaults standardUserDefaults] synchronize];
+}
+
+// make sure this happens after awakeFromNib
+- (void)restoreSplitViewPositiion
+{
+	float position = [[NSUserDefaults standardUserDefaults] floatForKey:kHistorySplitViewPositionDefault];
+	if (position < 1.0)
+		position = 175;
+
+	[historySplitView setPosition:position ofDividerAtIndex:0];
+	[historySplitView setHidden:NO];
 }
 
 

PBGitHistoryView.xib

@@ -1197,7 +1197,6 @@
 						<string key="NSFrameSize">{955, 405}</string>
 						<reference key="NSSuperview" ref="319362431"/>
 						<int key="NSDividerStyle">2</int>
-						<string key="NSAutosaveName">HistoryViewSplitView</string>
 					</object>
 				</object>
 				<string key="NSFrameSize">{955, 434}</string>