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

[Jehan Pagès <jehanp src gnome org>]

commit 953a095563107c7721defece9075de7dc8e78dba
Author: Jehan <jehan girinstud io>
Date:   Wed Nov 15 03:37:20 2017 +0100

    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 |   62 ++++++++++++++++++++++++++++++++++++++----
 app/display/gimpstatusbar.h |    1 +
 2 files changed, 57 insertions(+), 6 deletions(-)
---
diff --git a/app/display/gimpstatusbar.c b/app/display/gimpstatusbar.c
index f63140f..8ef2458 100644
--- a/app/display/gimpstatusbar.c
+++ b/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");
-  gtk_box_pack_start (GTK_BOX (hbox2), label, FALSE, FALSE, 2);
-  gtk_widget_show (label);
+  widget = gtk_label_new ("Cancel");
+  gtk_box_pack_start (GTK_BOX (hbox2), widget, FALSE, FALSE, 2);
+  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
@@ -1357,6 +1382,19 @@ gimp_statusbar_shell_scaled (GimpDisplayShell *shell,
 }
 
 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,
                                     GimpStatusbar    *statusbar)
@@ -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)
diff --git a/app/display/gimpstatusbar.h b/app/display/gimpstatusbar.h
index 3d51724..3639954 100644
--- a/app/display/gimpstatusbar.h
+++ b/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;