Generalize TabBarController transients to CyteKit.

1 files changed, 117 insertions, 0 deletions

diff --git a/CyteKit/TabBarController.mm b/CyteKit/TabBarController.mm
new file mode 100644
index 0000000..5f94e71
--- /dev/null
+++ b/CyteKit/TabBarController.mm
@@ -0,0 +1,117 @@
+/* Cydia - iPhone UIKit Front-End for Debian APT
+ * Copyright (C) 2008-2013  Jay Freeman (saurik)
+*/
+
+/* GNU General Public License, Version 3 {{{ */
+/*
+ * Cydia 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 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Cydia 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 Cydia.  If not, see <http://www.gnu.org/licenses/>.
+**/
+/* }}} */
+
+#include "CyteKit/TabBarController.h"
+
+#include "iPhonePrivate.h"
+
+@implementation UITabBarController (Cydia)
+
+@end
+
+@implementation CyteTabBarController
+
+- (void) didReceiveMemoryWarning {
+    [super didReceiveMemoryWarning];
+
+    // presenting a UINavigationController on 2.x does not update its transitionView
+    // it thereby will not allow its topViewController to be unloaded by memory pressure
+    if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
+        UIViewController *selected([self selectedViewController]);
+        for (UINavigationController *controller in [self viewControllers])
+            if (controller != selected)
+                if (UIViewController *top = [controller topViewController])
+                    [top unloadView];
+    }
+}
+
+- (void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
+    if ([self unselectedViewController])
+        [self setUnselectedViewController:nil];
+
+    // presenting a UINavigationController on 2.x does not update its transitionView
+    // if this view was unloaded, the tranitionView may currently be presenting nothing
+    if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
+        UINavigationController *navigation((UINavigationController *) viewController);
+        [navigation pushViewController:[[[UIViewController alloc] init] autorelease] animated:NO];
+        [navigation popViewControllerAnimated:NO];
+    }
+}
+
+- (void) dismissModalViewControllerAnimated:(BOOL)animated {
+    if ([self modalViewController] == nil && [self unselectedViewController] != nil)
+        [self setUnselectedViewController:nil];
+    else
+        [super dismissModalViewControllerAnimated:YES];
+}
+
+- (void) setUnselectedViewController:(UIViewController *)transient {
+    if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
+        if (transient != nil) {
+            [[[self viewControllers] objectAtIndex:0] pushViewController:transient animated:YES];
+            [self setSelectedIndex:0];
+        } return;
+    }
+
+    NSMutableArray *controllers = [[[self viewControllers] mutableCopy] autorelease];
+    if (transient != nil) {
+        UINavigationController *navigation([[[UINavigationController alloc] init] autorelease]);
+        [navigation setViewControllers:[NSArray arrayWithObject:transient]];
+        transient = navigation;
+
+        if (transient_ == nil)
+            remembered_ = [controllers objectAtIndex:0];
+        transient_ = transient;
+        [transient_ setTabBarItem:[remembered_ tabBarItem]];
+        [controllers replaceObjectAtIndex:0 withObject:transient_];
+        [self setSelectedIndex:0];
+        [self setViewControllers:controllers];
+        [self concealTabBarSelection];
+    } else if (remembered_ != nil) {
+        [remembered_ setTabBarItem:[transient_ tabBarItem]];
+        transient_ = transient;
+        [controllers replaceObjectAtIndex:0 withObject:remembered_];
+        remembered_ = nil;
+        [self setViewControllers:controllers];
+        [self revealTabBarSelection];
+    }
+}
+
+- (UIViewController *) unselectedViewController {
+    return transient_;
+}
+
+- (void) unloadData {
+    [super unloadData];
+
+    for (UINavigationController *controller in [self viewControllers])
+        [controller unloadData];
+
+    if (UIViewController *selected = [self selectedViewController])
+        [selected reloadData];
+
+    if (UIViewController *unselected = [self unselectedViewController]) {
+        [unselected unloadData];
+        [unselected reloadData];
+    }
+}
+
+@end