Fix the Stage view's horizontal split view

It will now remember it's position and the divider will keep its position relative to the bottom when the window resizes.

PBGitCommitController.h

@@ -10,6 +10,7 @@
 #import "PBViewController.h"
 
 @class PBGitIndexController, PBIconAndTextCell, PBWebChangesController, PBGitIndex;
+@class PBNiceSplitView;
 
 @interface PBGitCommitController : PBViewController {
 	// This might have to transfer over to the PBGitRepository
@@ -23,6 +24,7 @@
 
 	IBOutlet PBGitIndexController *indexController;
 	IBOutlet PBWebChangesController *webController;
+	IBOutlet PBNiceSplitView *commitSplitView;
 }
 
 @property(readonly) PBGitIndex *index;

PBGitCommitController.m

@@ -11,6 +11,10 @@
 #import "PBChangedFile.h"
 #import "PBWebChangesController.h"
 #import "PBGitIndex.h"
+#import "PBNiceSplitView.h"
+
+
+#define kCommitSplitViewPositionDefault @"Commit SplitView Position"
 
 @interface PBGitCommitController ()
 - (void)refreshFinished:(NSNotification *)notification;
@@ -22,6 +26,7 @@ - (void)commitHookFailed:(NSNotification *)notification;
 - (void)amendCommit:(NSNotification *)notification;
 - (void)indexChanged:(NSNotification *)notification;
 - (void)indexOperationFailed:(NSNotification *)notification;
+- (void)saveCommitSplitViewPosition;
 @end
 
 @implementation PBGitCommitController
@@ -65,10 +70,14 @@ - (void)awakeFromNib
 
 	[cachedFilesController setAutomaticallyRearrangesObjects:NO];
 	[unstagedFilesController setAutomaticallyRearrangesObjects:NO];
+
+	[commitSplitView setHidden:YES];
+	[self performSelector:@selector(restoreCommitSplitViewPositiion) withObject:nil afterDelay:0];
 }
 
 - (void)closeView
 {
+	[self saveCommitSplitViewPosition];
 	[webController closeView];
 }
 
@@ -211,4 +220,78 @@ - (void)indexOperationFailed:(NSNotification *)notification
 	[[repository windowController] showMessageSheet:@"Index operation failed" infoText:[[notification userInfo] objectForKey:@"description"]];
 }
 
+
+#pragma mark NSSplitView delegate methods
+
+#define kCommitSplitViewTopViewMin 150
+#define kCommitSplitViewBottomViewMin 100
+
+- (CGFloat)splitView:(NSSplitView *)splitView constrainMinCoordinate:(CGFloat)proposedMin ofSubviewAt:(NSInteger)dividerIndex
+{
+	if (splitView == commitSplitView)
+		return kCommitSplitViewTopViewMin;
+
+	return proposedMin;
+}
+
+- (CGFloat)splitView:(NSSplitView *)splitView constrainMaxCoordinate:(CGFloat)proposedMax ofSubviewAt:(NSInteger)dividerIndex
+{
+	if (splitView == commitSplitView)
+		return [splitView frame].size.height - [splitView dividerThickness] - kCommitSplitViewBottomViewMin;
+
+	return proposedMax;
+}
+
+// while the user resizes the window keep the lower (changes/message) view constant and just resize the upper view
+// unless the upper view gets too small
+- (void)resizeCommitSplitView
+{
+	NSRect newFrame = [commitSplitView frame];
+
+	float dividerThickness = [commitSplitView dividerThickness];
+
+	NSView *upperView = [[commitSplitView subviews] objectAtIndex:0];
+	NSRect upperFrame = [upperView frame];
+	upperFrame.size.width = newFrame.size.width;
+
+	NSView *lowerView = [[commitSplitView subviews] objectAtIndex:1];
+	NSRect lowerFrame = [lowerView frame];
+	lowerFrame.size.width = newFrame.size.width;
+
+	upperFrame.size.height = newFrame.size.height - lowerFrame.size.height - dividerThickness;
+	if (upperFrame.size.height < kCommitSplitViewTopViewMin)
+		upperFrame.size.height = kCommitSplitViewTopViewMin;
+
+	lowerFrame.size.height = newFrame.size.height - upperFrame.size.height - dividerThickness;
+	lowerFrame.origin.y = newFrame.size.height - lowerFrame.size.height;
+
+	[upperView setFrame:upperFrame];
+	[lowerView setFrame:lowerFrame];
+}
+
+- (void)splitView:(NSSplitView *)splitView resizeSubviewsWithOldSize:(NSSize)oldSize
+{
+	if (splitView == commitSplitView)
+		[self resizeCommitSplitView];
+}
+
+// NSSplitView does not save and restore the position of the splitView correctly so do it manually
+- (void)saveCommitSplitViewPosition
+{
+	float position = [[[commitSplitView subviews] objectAtIndex:0] frame].size.height;
+	[[NSUserDefaults standardUserDefaults] setFloat:position forKey:kCommitSplitViewPositionDefault];
+	[[NSUserDefaults standardUserDefaults] synchronize];
+}
+
+// make sure this happens after awakeFromNib
+- (void)restoreCommitSplitViewPositiion
+{
+	float position = [[NSUserDefaults standardUserDefaults] floatForKey:kCommitSplitViewPositionDefault];
+	if (position < 1.0)
+		position = [commitSplitView frame].size.height - 225;
+
+	[commitSplitView setPosition:position ofDividerAtIndex:0];
+	[commitSplitView setHidden:NO];
+}
+
 @end