From a4bf93e4d57c42c38ad59e169ecfc644a877775e Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 16 Apr 2015 12:55:39 -0300
Subject: [PATCH 1/3] MaskByColorCommand needs an active image to be executed
 (fix #627)

---
 src/app/commands/cmd_mask_by_color.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/app/commands/cmd_mask_by_color.cpp b/src/app/commands/cmd_mask_by_color.cpp
index cf20fdab8..e26a2c382 100644
--- a/src/app/commands/cmd_mask_by_color.cpp
+++ b/src/app/commands/cmd_mask_by_color.cpp
@@ -67,7 +67,8 @@ MaskByColorCommand::MaskByColorCommand()
 bool MaskByColorCommand::onEnabled(Context* context)
 {
   return context->checkFlags(ContextFlags::ActiveDocumentIsWritable |
-                             ContextFlags::HasActiveSprite);
+                             ContextFlags::HasActiveSprite |
+                             ContextFlags::HasActiveImage);
 }
 
 void MaskByColorCommand::onExecute(Context* context)

From 5a5a6fe4f631f5e568ce1589d31d29436a90bffb Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 16 Apr 2015 13:07:14 -0300
Subject: [PATCH 2/3] Replace slider_change_hook() with
 StatusBar::onCelOpacityChange()

---
 src/app/ui/status_bar.cpp | 10 ++++------
 src/app/ui/status_bar.h   |  1 +
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/app/ui/status_bar.cpp b/src/app/ui/status_bar.cpp
index 61ee1fd79..e1c618e2e 100644
--- a/src/app/ui/status_bar.cpp
+++ b/src/app/ui/status_bar.cpp
@@ -84,8 +84,6 @@ private:
   base::UniquePtr<ui::Timer> m_timer;
 };
 
-static void slider_change_hook(Slider* slider);
-
 static WidgetType statusbar_type()
 {
   static WidgetType type = kGenericWidget;
@@ -173,7 +171,7 @@ StatusBar::StatusBar()
     setup_mini_look(m_newFrame);
     setup_mini_look(m_slider);
 
-    m_slider->Change.connect(Bind<void>(&slider_change_hook, m_slider));
+    m_slider->Change.connect(Bind<void>(&StatusBar::onCelOpacityChange, this));
     m_slider->setMinSize(gfx::Size(ui::display_w()/5, 0));
 
     box1->setBorder(gfx::Border(2, 1, 2, 2)*guiscale());
@@ -426,7 +424,7 @@ bool StatusBar::CustomizedTipWindow::onProcessMessage(Message* msg)
   return ui::TipWindow::onProcessMessage(msg);
 }
 
-static void slider_change_hook(Slider* slider)
+void StatusBar::onCelOpacityChange()
 {
   try {
     ContextWriter writer(UIContext::instance(), 500);
@@ -434,13 +432,13 @@ static void slider_change_hook(Slider* slider)
     DocumentRange range = App::instance()->getMainWindow()->getTimeline()->range();
     if (range.enabled()) {
       for (Cel* cel : get_unique_cels(writer.sprite(), range))
-        cel->setOpacity(slider->getValue());
+        cel->setOpacity(m_slider->getValue());
     }
     else {
       Cel* cel = writer.cel();
       if (cel) {
         // Update the opacity
-        cel->setOpacity(slider->getValue());
+        cel->setOpacity(m_slider->getValue());
       }
     }
 
diff --git a/src/app/ui/status_bar.h b/src/app/ui/status_bar.h
index e0c41f753..483aab268 100644
--- a/src/app/ui/status_bar.h
+++ b/src/app/ui/status_bar.h
@@ -60,6 +60,7 @@ namespace app {
 
   private:
     void onCurrentToolChange();
+    void onCelOpacityChange();
     void updateFromDocument(Editor* editor);
     void updateCurrentFrame(Editor* editor);
     void newFrame();

From aae3e69fdaf7d1ee8141fc41f3f3881e24b352b6 Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 16 Apr 2015 13:14:39 -0300
Subject: [PATCH 3/3] Fix bug showing frame # and opacity slider in StatusBar
 without an active document

---
 src/app/ui/status_bar.cpp | 8 +++++---
 src/app/ui/status_bar.h   | 1 +
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/app/ui/status_bar.cpp b/src/app/ui/status_bar.cpp
index e1c618e2e..7f397d6c1 100644
--- a/src/app/ui/status_bar.cpp
+++ b/src/app/ui/status_bar.cpp
@@ -137,6 +137,7 @@ StatusBar* StatusBar::m_instance = NULL;
 StatusBar::StatusBar()
   : Widget(statusbar_type())
   , m_color(app::Color::fromMask())
+  , m_hasDoc(false)
 {
   m_instance = this;
 
@@ -331,7 +332,7 @@ void StatusBar::onResize(ResizeEvent& ev)
     rc.x += rc.w - prefWidth - border.right() - toolBarWidth;
     rc.w = prefWidth;
 
-    m_commandsBox->setVisible(true);
+    m_commandsBox->setVisible(true && m_hasDoc);
     m_commandsBox->setBounds(rc);
   }
   else
@@ -455,6 +456,7 @@ void StatusBar::updateFromDocument(Editor* editor)
   try {
     if (editor && editor->document()) {
       const DocumentReader reader(editor->document(), 100);
+      m_hasDoc = true;
       m_commandsBox->setVisible(true);
 
       // Cel opacity
@@ -473,11 +475,11 @@ void StatusBar::updateFromDocument(Editor* editor)
       }
     }
     else {
+      m_hasDoc = false;
       m_commandsBox->setVisible(false);
     }
   }
-  catch (LockedDocumentException&) {
-    // Disable all
+  catch (const LockedDocumentException&) {
     m_slider->setEnabled(false);
   }
 }
diff --git a/src/app/ui/status_bar.h b/src/app/ui/status_bar.h
index 483aab268..50eeada05 100644
--- a/src/app/ui/status_bar.h
+++ b/src/app/ui/status_bar.h
@@ -83,6 +83,7 @@ namespace app {
     ui::Slider* m_slider;             // Opacity slider
     ui::Entry* m_currentFrame;        // Current frame and go to frame entry
     ui::Button* m_newFrame;           // Button to create a new frame
+    bool m_hasDoc;
 
     // Tip window
     class CustomizedTipWindow;