Add "View > Duplicate View" to create multiple views of the same document

data/gui.xml

@@ -569,6 +569,8 @@
         <item command="SaveMask" text="&amp;Save to MSK file" />
       </menu>
       <menu text="&amp;View">
+	<item command="DuplicateView" text="Duplicate &amp;View" />
+        <separator />
         <item command="ShowPixelGrid" text="Show &amp;Pixel Grid" />
         <item command="ShowGrid" text="Show &amp;Grid" />
         <item command="SnapToGrid" text="&amp;Snap to Grid" />
@@ -628,6 +630,7 @@
 
     <menu id="document_tab_popup">
       <item command="CloseFile" text="&amp;Close" />
+      <item command="DuplicateView" text="Duplicate &amp;View" />
       <separator />
       <item command="OpenWithApp" text="&amp;Open with OS" />
       <item command="OpenInFolder" text="Open in &amp;Folder" />

src/app/CMakeLists.txt

@@ -146,6 +146,7 @@ add_library(app-lib
   commands/cmd_developer_console.cpp
   commands/cmd_duplicate_layer.cpp
   commands/cmd_duplicate_sprite.cpp
+  commands/cmd_duplicate_view.cpp
   commands/cmd_exit.cpp
   commands/cmd_export_sprite_sheet.cpp
   commands/cmd_eyedropper.cpp

src/app/commands/cmd_duplicate_view.cpp

@@ -0,0 +1,58 @@
+// Aseprite
+// Copyright (C) 2001-2015  David Capello
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/commands/command.h"
+
+#include "app/app.h"
+#include "app/ui/main_window.h"
+#include "app/ui/workspace.h"
+
+#include <cstdio>
+
+namespace app {
+
+// using namespace ui;
+
+class DuplicateViewCommand : public Command {
+public:
+  DuplicateViewCommand();
+  Command* clone() const override { return new DuplicateViewCommand(*this); }
+
+protected:
+  bool onEnabled(Context* context) override;
+  void onExecute(Context* context) override;
+};
+
+DuplicateViewCommand::DuplicateViewCommand()
+  : Command("DuplicateView",
+            "Duplicate View",
+            CmdUIOnlyFlag)
+{
+}
+
+bool DuplicateViewCommand::onEnabled(Context* context)
+{
+  Workspace* workspace = App::instance()->getMainWindow()->getWorkspace();
+  WorkspaceView* view = workspace->activeView();
+  return (view != nullptr);
+}
+
+void DuplicateViewCommand::onExecute(Context* context)
+{
+  App::instance()->getMainWindow()->getWorkspace()->duplicateActiveView();
+}
+
+Command* CommandFactory::createDuplicateViewCommand()
+{
+  return new DuplicateViewCommand;
+}
+
+} // namespace app

src/app/commands/commands_list.h

@@ -31,6 +31,7 @@ FOR_EACH_COMMAND(Despeckle)
 FOR_EACH_COMMAND(DeveloperConsole)
 FOR_EACH_COMMAND(DuplicateLayer)
 FOR_EACH_COMMAND(DuplicateSprite)
+FOR_EACH_COMMAND(DuplicateView)
 FOR_EACH_COMMAND(Exit)
 FOR_EACH_COMMAND(ExportSpriteSheet)
 FOR_EACH_COMMAND(Eyedropper)

src/app/ui/devconsole_view.cpp

@@ -110,6 +110,7 @@ void DevConsoleView::onWorkspaceViewSelected()
 
 void DevConsoleView::onClonedFrom(WorkspaceView* from)
 {
+  // Do nothing
 }
 
 bool DevConsoleView::onCloseView(Workspace* workspace)

src/app/ui/document_view.cpp

@@ -231,6 +231,17 @@ void DocumentView::onClonedFrom(WorkspaceView* from)
 
 bool DocumentView::onCloseView(Workspace* workspace)
 {
+  // If there is another view for this document, just close the view.
+  for (auto view : *workspace) {
+    DocumentView* docView = dynamic_cast<DocumentView*>(view);
+    if (docView && docView != this &&
+        docView->getDocument() == getDocument()) {
+      workspace->removeView(this);
+      delete this;
+      return true;
+    }
+  }
+
   UIContext* ctx = UIContext::instance();
   bool save_it;
   bool try_again = true;

src/app/ui/home_view.cpp

@@ -69,7 +69,7 @@ TabIcon HomeView::getTabIcon()
 
 WorkspaceView* HomeView::cloneWorkspaceView()
 {
-  return NULL;                  // This view cannot be cloned
+  return nullptr;               // This view cannot be cloned
 }
 
 void HomeView::onClonedFrom(WorkspaceView* from)

src/app/ui/workspace.cpp

@@ -116,6 +116,22 @@ void Workspace::selectPreviousTab()
   m_activePanel->tabs()->selectPreviousTab();
 }
 
+void Workspace::duplicateActiveView()
+{
+  WorkspaceView* view = activeView();
+  if (!view)
+    return;
+
+  WorkspaceView* clone = view->cloneWorkspaceView();
+  if (!clone)
+    return;
+
+  WorkspacePanel* panel = getViewPanel(view);
+  addViewToPanel(panel, clone, false, -1);
+  clone->onClonedFrom(view);
+  setActiveView(clone);
+}
+
 void Workspace::onPaint(PaintEvent& ev)
 {
   ev.getGraphics()->fillRect(getBgColor(), getClientBounds());

src/app/ui/workspace.h

@@ -43,6 +43,7 @@ namespace app {
     void setMainPanelAsActive();
     void selectNextTab();
     void selectPreviousTab();
+    void duplicateActiveView();
 
     // Set the preview of what could happen if we drop the given
     // "view" at the "pos"?