Bug 789173 - Make canvas rotation information visible on the main window

The rotation angle is made visible in the status bar.
Clicking the angle label also opens the "Select Rotation Angle" dialog.

app/display/gimpstatusbar.c

@@ -33,6 +33,7 @@
 #include "core/gimpimage.h"
 #include "core/gimpprogress.h"
 
+#include "widgets/gimpuimanager.h"
 #include "widgets/gimpwidgets-utils.h"
 
 #include "gimpdisplay.h"
@@ -113,8 +114,13 @@ static void     gimp_statusbar_scale_changed      (GimpScaleComboBox *combo,
                                                    GimpStatusbar     *statusbar);
 static void     gimp_statusbar_scale_activated    (GimpScaleComboBox *combo,
                                                    GimpStatusbar     *statusbar);
+static gboolean gimp_statusbar_rotate_label_pressed (GtkWidget       *event_box,
+                                                     GdkEvent        *event,
+                                                     GimpStatusbar   *statusbar);
 static void     gimp_statusbar_shell_scaled       (GimpDisplayShell  *shell,
                                                    GimpStatusbar     *statusbar);
+static void     gimp_statusbar_shell_rotated      (GimpDisplayShell  *shell,
+                                                   GimpStatusbar     *statusbar);
 static void     gimp_statusbar_shell_status_notify(GimpDisplayShell  *shell,
                                                    const GParamSpec  *pspec,
                                                    GimpStatusbar     *statusbar);
@@ -178,7 +184,7 @@ gimp_statusbar_init (GimpStatusbar *statusbar)
   GtkWidget     *hbox;
   GtkWidget     *hbox2;
   GtkWidget     *image;
-  GtkWidget     *label;
+  GtkWidget     *widget;
   GimpUnitStore *store;
   GList         *children;
 
@@ -243,6 +249,17 @@ gimp_statusbar_init (GimpStatusbar *statusbar)
                     G_CALLBACK (gimp_statusbar_scale_activated),
                     statusbar);
 
+  widget = gtk_event_box_new ();
+  gtk_widget_add_events (widget, GDK_BUTTON_PRESS_MASK);
+  statusbar->rotate_label = gtk_label_new (NULL);
+  g_signal_connect (widget, "button-press-event",
+                    G_CALLBACK (gimp_statusbar_rotate_label_pressed),
+                    statusbar);
+  gtk_container_add (GTK_CONTAINER (widget), statusbar->rotate_label);
+  gtk_box_pack_start (GTK_BOX (hbox), widget, FALSE, FALSE, 1);
+  gtk_widget_show (statusbar->rotate_label);
+  gtk_widget_show (widget);
+
   /*  put the label back into the message area  */
   gtk_box_pack_start (GTK_BOX (hbox), statusbar->label, TRUE, TRUE, 1);
 
@@ -281,9 +298,9 @@ gimp_statusbar_init (GimpStatusbar *statusbar)
   gtk_box_pack_start (GTK_BOX (hbox2), image, FALSE, FALSE, 2);
   gtk_widget_show (image);
 
-  label = gtk_label_new ("Cancel");
+  widget = gtk_label_new ("Cancel");
-  gtk_box_pack_start (GTK_BOX (hbox2), label, FALSE, FALSE, 2);
+  gtk_box_pack_start (GTK_BOX (hbox2), widget, FALSE, FALSE, 2);
-  gtk_widget_show (label);
+  gtk_widget_show (widget);
 
   g_signal_connect (statusbar->cancel_button, "clicked",
                     G_CALLBACK (gimp_statusbar_progress_canceled),
@@ -717,7 +734,9 @@ gimp_statusbar_set_shell (GimpStatusbar    *statusbar,
       g_signal_handlers_disconnect_by_func (statusbar->shell,
                                             gimp_statusbar_shell_scaled,
                                             statusbar);
-
+      g_signal_handlers_disconnect_by_func (statusbar->shell,
+                                            gimp_statusbar_shell_rotated,
+                                            statusbar);
       g_signal_handlers_disconnect_by_func (statusbar->shell,
                                             gimp_statusbar_shell_status_notify,
                                             statusbar);
@@ -728,10 +747,13 @@ gimp_statusbar_set_shell (GimpStatusbar    *statusbar,
   g_signal_connect_object (statusbar->shell, "scaled",
                            G_CALLBACK (gimp_statusbar_shell_scaled),
                            statusbar, 0);
-
+  g_signal_connect_object (statusbar->shell, "rotated",
+                           G_CALLBACK (gimp_statusbar_shell_rotated),
+                           statusbar, 0);
   g_signal_connect_object (statusbar->shell, "notify::status",
                            G_CALLBACK (gimp_statusbar_shell_status_notify),
                            statusbar, 0);
+  gimp_statusbar_shell_rotated (shell, statusbar);
 }
 
 gboolean
@@ -771,6 +793,7 @@ gimp_statusbar_empty (GimpStatusbar *statusbar)
   gtk_widget_hide (statusbar->cursor_label);
   gtk_widget_hide (statusbar->unit_combo);
   gtk_widget_hide (statusbar->scale_combo);
+  gtk_widget_hide (statusbar->rotate_label);
 }
 
 void
@@ -781,6 +804,8 @@ gimp_statusbar_fill (GimpStatusbar *statusbar)
   gtk_widget_show (statusbar->cursor_label);
   gtk_widget_show (statusbar->unit_combo);
   gtk_widget_show (statusbar->scale_combo);
+  gtk_widget_show (statusbar->rotate_label);
+  gimp_statusbar_shell_rotated (statusbar->shell, statusbar);
 }
 
 void
@@ -1356,6 +1381,19 @@ gimp_statusbar_shell_scaled (GimpDisplayShell *shell,
   gimp_statusbar_clear_cursor (statusbar);
 }
 
+static void
+gimp_statusbar_shell_rotated (GimpDisplayShell *shell,
+                              GimpStatusbar    *statusbar)
+{
+  gchar *text;
+
+  /* Degree symbol U+00B0. There are no spaces between the value and the
+   * unit for angular rotation. */
+  text = g_strdup_printf ("%.2f\xC2\xB0", shell->rotate_angle);
+  gtk_label_set_text (GTK_LABEL (statusbar->rotate_label), text);
+  g_free (text);
+}
+
 static void
 gimp_statusbar_shell_status_notify (GimpDisplayShell *shell,
                                     const GParamSpec *pspec,
@@ -1390,6 +1428,18 @@ gimp_statusbar_scale_activated (GimpScaleComboBox *combo,
   gtk_widget_grab_focus (statusbar->shell->canvas);
 }
 
+static gboolean
+gimp_statusbar_rotate_label_pressed (GtkWidget     *event_box,
+                                     GdkEvent      *event,
+                                     GimpStatusbar *statusbar)
+{
+  GimpImageWindow *window = gimp_display_shell_get_window (statusbar->shell);
+  GimpUIManager   *manager = gimp_image_window_get_ui_manager (window);
+
+  gimp_ui_manager_activate_action (manager, "view", "view-rotate-other");
+  return FALSE;
+}
+
 static guint
 gimp_statusbar_get_context_id (GimpStatusbar *statusbar,
                                const gchar   *context)

app/display/gimpstatusbar.h

@@ -58,6 +58,7 @@ struct _GimpStatusbar
   GtkWidget           *cursor_label;
   GtkWidget           *unit_combo;
   GtkWidget           *scale_combo;
+  GtkWidget           *rotate_label;
   GtkWidget           *label; /* same as GtkStatusbar->label */
 
   GtkWidget           *progressbar;