Update props window when a window's document changes

A window's document can change when opening a document from a window
that is has no backing file and no changes.  The properties window was
not getting updated propertly when this happened (it still referred to
the old document).  Now it is updated properly.

3 files changed, 51 insertions, 7 deletions

diff --git a/tikzit/src/gtk/Application.m b/tikzit/src/gtk/Application.m
index 1459355..a7f1824 100644
--- a/tikzit/src/gtk/Application.m
+++ b/tikzit/src/gtk/Application.m
@@ -52,6 +52,11 @@ Application* app = nil;
 - (void) windowClosed:(NSNotification*)notification;
 - (void) windowGainedFocus:(NSNotification*)notification;
 - (void) selectedToolChanged:(NSNotification*)notification;
+- (void) windowDocumentChanged:(NSNotification*)n;
+@end
+
+@interface Application (Private)
+- (void) setActiveWindow:(Window*)window;
 @end
 
 @implementation Application
@@ -227,7 +232,9 @@ Application* app = nil;
                                              selector:@selector(windowGainedFocus:)
                                                  name:@"WindowGainedFocus"
                                                object:window];
-    // FIXME: focus?
+    if ([window hasFocus]) {
+        [self setActiveWindow:window];
+    }
 }
 
 - (void) newWindow {
@@ -339,11 +346,12 @@ Application* app = nil;
         gtk_main_quit();
     }
 }
+
 - (void) windowGainedFocus:(NSNotification*)notification {
     Window *window = [notification object];
-    TikzDocument *doc = [window document];
-    [propertiesWindow setDocument:doc];
+    [self setActiveWindow:window];
 }
+
 - (void) selectedToolChanged:(NSNotification*)n {
     id<Tool> tool = [[n userInfo] objectForKey:@"tool"];
     if (tool != nil)
@@ -351,6 +359,26 @@ Application* app = nil;
     else
         NSLog(@"nil tool!");
 }
+
+- (void) windowDocumentChanged:(NSNotification*)n {
+    [propertiesWindow setDocument:[[n userInfo] objectForKey:@"document"]];
+}
+@end
+
+@implementation Application (Private)
+- (void) setActiveWindow:(Window*)window {
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                    name:@"DocumentChanged"
+                                                  object:nil];
+
+    [propertiesWindow setDocument:[window document]];
+
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(windowDocumentChanged:)
+               name:@"DocumentChanged"
+             object:window];
+}
 @end
 
 // vim:ft=objc:ts=8:et:sts=4:sw=4:foldmethod=marker
diff --git a/tikzit/src/gtk/Window.h b/tikzit/src/gtk/Window.h
index 570cdf4..bac64a0 100644
--- a/tikzit/src/gtk/Window.h
+++ b/tikzit/src/gtk/Window.h
@@ -58,7 +58,9 @@
 /**
  * The document displayed by the window
  */
-@property (retain) TikzDocument *document;
+@property (retain)   TikzDocument *document;
+
+@property (readonly) BOOL          hasFocus;
 
 /**
  * Create a window with an empty document
diff --git a/tikzit/src/gtk/Window.m b/tikzit/src/gtk/Window.m
index c5e7654..d5dcf03 100644
--- a/tikzit/src/gtk/Window.m
+++ b/tikzit/src/gtk/Window.m
@@ -148,9 +148,8 @@ static void update_paste_action (GtkClipboard *clipboard, GdkEvent *event, GtkAc
     [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:[document pickSupport]];
     [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:document];
 
-    [newDoc retain];
-    [document release];
-    document = newDoc;
+    TikzDocument *oldDoc = document;
+    document = [newDoc retain];
 
     [graphPanel setDocument:document];
     [self _updateTikz];
@@ -174,6 +173,21 @@ static void update_paste_action (GtkClipboard *clipboard, GdkEvent *event, GtkAc
     if ([document path] != nil) {
         [[RecentManager defaultManager] addRecentFile:[document path]];
     }
+
+    NSDictionary *userInfo;
+    userInfo = [NSDictionary dictionaryWithObjectsAndKeys:
+                document, @"document",
+                oldDoc, @"oldDocument",
+                nil];
+    [[NSNotificationCenter defaultCenter]
+        postNotificationName:@"DocumentChanged"
+                      object:self
+                    userInfo:userInfo];
+    [oldDoc release];
+}
+
+- (BOOL) hasFocus {
+    return gtk_window_has_toplevel_focus (GTK_WINDOW (window));
 }
 
 - (void) present {