Add some documentation on action manager and commands

Change-Id: I03d8292120b30973155248471b12d1627536fb39
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

4 files changed, 1048 insertions, 0 deletions

diff --git a/doc/qtcreatordev/images/actionmanager.png b/doc/qtcreatordev/images/actionmanager.png
new file mode 100644
index 0000000000..0c2a954eed
--- /dev/null
+++ b/doc/qtcreatordev/images/actionmanager.png
diff --git a/doc/qtcreatordev/images/actionmanager.qmodel b/doc/qtcreatordev/images/actionmanager.qmodel
new file mode 100644
index 0000000000..f8c56fe1b3
--- /dev/null
+++ b/doc/qtcreatordev/images/actionmanager.qmodel
@@ -0,0 +1,854 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<qmt>
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+  <uid>{f7c67e69-57c5-4eb1-9303-f12bb2ae0a23}</uid>
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+       <name>actionmanager</name>
+       <children>
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+           <item>
+            <handle>
+             <uid>{a3950ef4-9fd9-466f-a575-dc75790749c3}</uid>
+             <target>
+              <instance type="MItem">
+               <MItem>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{a3950ef4-9fd9-466f-a575-dc75790749c3}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>QAction</name>
+                 </MObject>
+                </base-MObject>
+               </MItem>
+              </instance>
+             </target>
+            </handle>
+           </item>
+           <item>
+            <handle>
+             <uid>{ac06f227-7618-422e-a87e-5913950c91d7}</uid>
+             <target>
+              <instance type="MItem">
+               <MItem>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{ac06f227-7618-422e-a87e-5913950c91d7}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>QAction</name>
+                 </MObject>
+                </base-MObject>
+               </MItem>
+              </instance>
+             </target>
+            </handle>
+           </item>
+           <item>
+            <handle>
+             <uid>{0cc14318-53df-4193-8aeb-0d29d4cd1561}</uid>
+             <target>
+              <instance type="MItem">
+               <MItem>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{0cc14318-53df-4193-8aeb-0d29d4cd1561}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>QAction</name>
+                 </MObject>
+                </base-MObject>
+               </MItem>
+              </instance>
+             </target>
+            </handle>
+           </item>
+           <item>
+            <handle>
+             <uid>{68e762c3-f1cc-479b-9700-bdb01f208340}</uid>
+             <target>
+              <instance type="MClass">
+               <MClass>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{68e762c3-f1cc-479b-9700-bdb01f208340}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>Command</name>
+                  <relations>
+                   <handles>
+                    <handles>
+                     <qlist>
+                      <item>
+                       <handle>
+                        <uid>{8d18c30e-51c8-4fa2-ad22-ad6962273120}</uid>
+                        <target>
+                         <instance type="MDependency">
+                          <MDependency>
+                           <base-MRelation>
+                            <MRelation>
+                             <base-MElement>
+                              <MElement>
+                               <uid>{8d18c30e-51c8-4fa2-ad22-ad6962273120}</uid>
+                              </MElement>
+                             </base-MElement>
+                             <a>{68e762c3-f1cc-479b-9700-bdb01f208340}</a>
+                             <b>{a3950ef4-9fd9-466f-a575-dc75790749c3}</b>
+                            </MRelation>
+                           </base-MRelation>
+                          </MDependency>
+                         </instance>
+                        </target>
+                       </handle>
+                      </item>
+                      <item>
+                       <handle>
+                        <uid>{8d11e47d-b745-4bf4-b7d2-eb042c307ddf}</uid>
+                        <target>
+                         <instance type="MDependency">
+                          <MDependency>
+                           <base-MRelation>
+                            <MRelation>
+                             <base-MElement>
+                              <MElement>
+                               <uid>{8d11e47d-b745-4bf4-b7d2-eb042c307ddf}</uid>
+                              </MElement>
+                             </base-MElement>
+                             <a>{68e762c3-f1cc-479b-9700-bdb01f208340}</a>
+                             <b>{ac06f227-7618-422e-a87e-5913950c91d7}</b>
+                            </MRelation>
+                           </base-MRelation>
+                          </MDependency>
+                         </instance>
+                        </target>
+                       </handle>
+                      </item>
+                     </qlist>
+                    </handles>
+                   </handles>
+                  </relations>
+                 </MObject>
+                </base-MObject>
+                <members>
+                 <qlist>
+                  <item>
+                   <MClassMember>
+                    <uid>{5d8da03d-d556-4eed-ae0d-6d306453496e}</uid>
+                    <type>1</type>
+                    <declaration>QAction</declaration>
+                   </MClassMember>
+                  </item>
+                 </qlist>
+                </members>
+               </MClass>
+              </instance>
+             </target>
+            </handle>
+           </item>
+           <item>
+            <handle>
+             <uid>{39911558-001e-4d0b-9827-d1d372049e86}</uid>
+             <target>
+              <instance type="MClass">
+               <MClass>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{39911558-001e-4d0b-9827-d1d372049e86}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>Command</name>
+                  <relations>
+                   <handles>
+                    <handles>
+                     <qlist>
+                      <item>
+                       <handle>
+                        <uid>{9f1e7858-c06c-4c7c-97d6-209d3c96360f}</uid>
+                        <target>
+                         <instance type="MDependency">
+                          <MDependency>
+                           <base-MRelation>
+                            <MRelation>
+                             <base-MElement>
+                              <MElement>
+                               <uid>{9f1e7858-c06c-4c7c-97d6-209d3c96360f}</uid>
+                              </MElement>
+                             </base-MElement>
+                             <a>{39911558-001e-4d0b-9827-d1d372049e86}</a>
+                             <b>{0cc14318-53df-4193-8aeb-0d29d4cd1561}</b>
+                            </MRelation>
+                           </base-MRelation>
+                          </MDependency>
+                         </instance>
+                        </target>
+                       </handle>
+                      </item>
+                     </qlist>
+                    </handles>
+                   </handles>
+                  </relations>
+                 </MObject>
+                </base-MObject>
+                <members>
+                 <qlist>
+                  <item>
+                   <MClassMember>
+                    <uid>{2d428a77-4751-4fa7-bbb7-7f58995da129}</uid>
+                    <type>1</type>
+                    <declaration>QAction</declaration>
+                   </MClassMember>
+                  </item>
+                 </qlist>
+                </members>
+               </MClass>
+              </instance>
+             </target>
+            </handle>
+           </item>
+           <item>
+            <handle>
+             <uid>{158de17f-753a-4b00-8ddf-2f4432871d07}</uid>
+             <target>
+              <instance type="MItem">
+               <MItem>
+                <base-MObject>
+                 <MObject>
+                  <base-MElement>
+                   <MElement>
+                    <uid>{158de17f-753a-4b00-8ddf-2f4432871d07}</uid>
+                   </MElement>
+                  </base-MElement>
+                  <name>Menu</name>
+                 </MObject>
+                </base-MObject>
+               </MItem>
+              </instance>
+             </target>
+            </handle>
+           </item>
+          </qlist>
+         </handles>
+        </handles>
+       </children>
+      </MObject>
+     </base-MObject>
+    </MPackage>
+   </instance>
+  </root-package>
+ </project>
+</qmt>
diff --git a/doc/qtcreatordev/src/actionmanager.qdoc b/doc/qtcreatordev/src/actionmanager.qdoc
new file mode 100644
index 0000000000..194d0eefdf
--- /dev/null
+++ b/doc/qtcreatordev/src/actionmanager.qdoc
@@ -0,0 +1,193 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Creator documentation.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+**
+****************************************************************************/
+
+/*!
+    \page actionmanager.html
+    \title The Action Manager and Commands
+
+    \QC provides a central options page for managing shortcuts for actions in
+    \uicontrol Tools > \uicontrol Options > \uicontrol Environment >
+    \uicontrol Keyboard. Plugins must tell \QC about the actions they provide,
+    so they can appear in the options. Also some actions, like \uicontrol Edit >
+    \uicontrol Undo, need to be dispatched to different plugins depending on the
+    context which the user is currently in, for example a text editor, or
+    a UI design component. The Core::ActionManager and Core::Command classes
+    are used to manage this.
+
+    The action manager contains a list of Core::Command instances. Each command
+    represents an entry in the keyboard shortcut settings.
+
+    A command also manages which actual QAction is currently represented by the
+    command, depending on context. For this, a command has its own QAction which
+    is accessible via Core::Command::action(), and should be used when adding
+    the command to the UI like the menu and tool buttons. This QAction delegates
+    its \c triggered() and \c toggled() signals to the currently active QAction.
+
+    \image actionmanager.png
+
+    \section1 Command
+
+    The class Core::Command represents an action with a shortcut that can be
+    set by the user in the settings, and can be delegated to an actual
+    QAction in a plugin, depending on context.
+
+    A command is referred to by its unique ID. Plugins use the ID when
+    registering an action for the command in a specified context with
+    Core::ActionManager::registerAction(). That method returns a Core::Command
+    instance that is then used to further configure the action.
+    If multiple QActions are registered for the same command (the same ID),
+    they must be registered for different contexts.
+    The ID is also used for grouping in the options page: everything up to the
+    first dot in the ID is used as the category, under which to show the
+    command.
+
+    By default, the options page shows the text of the currently active QAction
+    in addition to the ID. If that does not fit the purpose well, you can set a
+    different display text with Core::Command::setDescription().
+
+    Use the command's Core::Command::setDefaultKeySequence() method to set the
+    default key sequence that is used if the user doesn't customize it.
+    The shortcut on the QAction that you register with
+    Core::ActionManager::registerAction() is never used, so do not set that.
+
+    Core::Command::action() returns the action that should be used for UI and
+    user interaction. Add this to menus and tool buttons. You should never
+    set properties like the enabled or visibility state on this QAction
+    directly. It is managed by the action manager and reflects the state of the
+    currently active QAction in some plugin.
+
+    The QAction that you registered in the action manager is for your internal
+    purposes. Use that to connect your logic to the QAction::triggered()
+    signal, and to set the enabled and visibility state.
+    Core::Command::action() will reflect these changes, if your QAction is
+    active, determined by the active context. For performance reasons the
+    action text, tool tip and icon are not updated by default. They are only
+    copied from the first QAction registered for the command. Set the
+    corresponding Core::Command::CommandAttribute if you need dynamic updates
+    of these properties.
+
+    \section1 Contexts
+
+    When plugins register a QAction for a command, they need to provide a
+    Core::Context. Which of the registered QActions for a command is currently
+    active is decided via an ordered list of current contexts.
+
+    Contexts are collected from multiple sources:
+
+    \list
+        \li Global context. This is a context that is always active, with lowest
+            priority order.
+        \li Application focus. Instances of QWidget can be associated to a
+            context via Core::IContext. All contexts from the current focus
+            widget up the widget hierarchy are added to the current context.
+        \li Manually managed contexts. Contexts can be added and removed
+            manually via ICore::updateAdditionalContexts().
+    \endlist
+
+    \section2 Using IContext
+
+    Core::IContext is a separate object that associates the QWidget from
+    Core::IContext::widget() with the context Core::IContext::context().
+
+    To associate a widget with a context, create a Core::IContext instance,
+    set the widget and context on it, and register it with
+    Core::ICore::addContextObject(). Whenever your widget is in the parent
+    chain of the application focus widget, the context that you specified
+    will be active as well.
+
+    \code
+    auto contextObj = new Core::IContext(this);
+    contextObj->setWidget(myWidget);
+    contextObj->setContext(myContext);
+    Core::ICore::addContextObject(contextObj);
+    \endcode
+
+    You also have to unregister the IContext object with
+    Core::ICore::removeContextObject() when you do not need it anymore.
+
+    Some constructs in \QC automatically have an associated context, like
+    Core::IEditor and Core::IMode.
+
+    \section2 Manually Managing Contexts
+
+    If you want a context to be active or inactive independently of the
+    application focus, you can add and remove contexts manually with
+    Core::ICore::updateAdditionalContexts(), Core::ICore::addAdditionalContext()
+    and Core::ICore::removeAdditionalContext().
+    Prefer Core::ICore::updateAdditionalContexts() if you need to remove and add
+    contexts, to avoid overhead introduced by removing and adding contexts
+    in separate calls.
+
+    \section1 Registering Actions
+
+    Prefer registering actions in your plugin's
+    ExtensionSystem::IPlugin::initialize() method. This way any plugin depending
+    on your plugin has access to these actions.
+
+    \code
+    namespace Constants {
+    const char ACTION_ID[] = "Example.Action";
+    } // Constants
+
+    bool ExamplePlugin::initialize(const QStringList &arguments, QString *errorString)
+    {
+        // some other setup ...
+
+        QAction *action = new QAction(tr("Example Action"), this);
+        Core::Command *cmd = Core::ActionManager::registerAction(action, Constants::ACTION_ID,
+                                                Core::Context(Core::Constants::C_GLOBAL));
+        cmd->setDefaultKeySequence(QKeySequence(tr("Ctrl+Alt+Meta+A")));
+        connect(action, &QAction::triggered, this, [this] {
+            // do something
+        });
+
+        // more setup ...
+
+        return true;
+    }
+    \endcode
+
+    This snippet sets up a sample action with the ID \c ACTION_ID that is always
+    active (specified by the context \c {Core::Constants::C_GLOBAL}), and gives
+    it the keyboard shortcut \c {Ctrl+Alt+Meta+A}. The \c {QAction *action}
+    that is registered for the global context for the action is owned by the
+    plugin. Connect to this QAction's triggered signal, and manage the action's
+    state by calling the corresponding methods on this QAction instance.
+
+    \section1 Summary
+
+    \list
+        \li Use Core::ActionManager::registerAction() to register your own
+            QAction for a command with the specified ID.
+        \li If multiple QActions are registered for the same command, they need
+            to be registered for different contexts.
+        \li Use Core::Command::setDefaultKeySequence(), do \e not use
+            QAction::setShortcut().
+        \li Use Core::Command::action() for user-facing purposes, such as
+            menus and tool buttons.
+        \li Use your own QAction to set properties like text and icon, and to
+            connect your application logic.
+    \endlist
+*/
diff --git a/doc/qtcreatordev/src/creating-plugins.qdoc b/doc/qtcreatordev/src/creating-plugins.qdoc
index 9b736b0c51..5a8bf7905d 100644
--- a/doc/qtcreatordev/src/creating-plugins.qdoc
+++ b/doc/qtcreatordev/src/creating-plugins.qdoc
@@ -63,6 +63,7 @@
 
     \list
         \li \l{The Plugin Manager, the Object Pool, and Registered Objects}
+        \li \l{The Action Manager and Commands}
     \omit
         \li \l{Aggregations}
         \li \l{Extending and Providing Interfaces}