juce_ApplicationCommandManager.cpp

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/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
ApplicationCommandManager::ApplicationCommandManager()
{
    keyMappings.reset (new KeyPressMappingSet (*this));
    Desktop::getInstance().addFocusChangeListener (this);
}
 
ApplicationCommandManager::~ApplicationCommandManager()
{
    Desktop::getInstance().removeFocusChangeListener (this);
    keyMappings.reset();
}
 
//==============================================================================
void ApplicationCommandManager::clearCommands()
{
    commands.clear();
    keyMappings->clearAllKeyPresses();
    triggerAsyncUpdate();
}
 
void ApplicationCommandManager::registerCommand (const ApplicationCommandInfo& newCommand)
{
    // zero isn't a valid command ID!
    jassert (newCommand.commandID != 0);
 
    // the name isn't optional!
    jassert (newCommand.shortName.isNotEmpty());
 
    if (auto* command = getMutableCommandForID (newCommand.commandID))
    {
        // Trying to re-register the same command ID with different parameters can often indicate a typo.
        // This assertion is here because I've found it useful catching some mistakes, but it may also cause
        // false alarms if you're deliberately updating some flags for a command.
        jassert (newCommand.shortName == getCommandForID (newCommand.commandID)->shortName
                  && newCommand.categoryName == getCommandForID (newCommand.commandID)->categoryName
                  && newCommand.defaultKeypresses == getCommandForID (newCommand.commandID)->defaultKeypresses
                  && (newCommand.flags & (ApplicationCommandInfo::wantsKeyUpDownCallbacks | ApplicationCommandInfo::hiddenFromKeyEditor | ApplicationCommandInfo::readOnlyInKeyEditor))
                       == (getCommandForID (newCommand.commandID)->flags & (ApplicationCommandInfo::wantsKeyUpDownCallbacks | ApplicationCommandInfo::hiddenFromKeyEditor | ApplicationCommandInfo::readOnlyInKeyEditor)));
 
        *command = newCommand;
    }
    else
    {
        auto* newInfo = new ApplicationCommandInfo (newCommand);
        newInfo->flags &= ~ApplicationCommandInfo::isTicked;
        commands.add (newInfo);
 
        keyMappings->resetToDefaultMapping (newCommand.commandID);
 
        triggerAsyncUpdate();
    }
}
 
void ApplicationCommandManager::registerAllCommandsForTarget (ApplicationCommandTarget* target)
{
    if (target != nullptr)
    {
        Array<CommandID> commandIDs;
        target->getAllCommands (commandIDs);
 
        for (int i = 0; i < commandIDs.size(); ++i)
        {
            ApplicationCommandInfo info (commandIDs.getUnchecked(i));
            target->getCommandInfo (info.commandID, info);
 
            registerCommand (info);
        }
    }
}
 
void ApplicationCommandManager::removeCommand (const CommandID commandID)
{
    for (int i = commands.size(); --i >= 0;)
    {
        if (commands.getUnchecked (i)->commandID == commandID)
        {
            commands.remove (i);
            triggerAsyncUpdate();
 
            const Array<KeyPress> keys (keyMappings->getKeyPressesAssignedToCommand (commandID));
 
            for (int j = keys.size(); --j >= 0;)
                keyMappings->removeKeyPress (keys.getReference (j));
        }
    }
}
 
void ApplicationCommandManager::commandStatusChanged()
{
    triggerAsyncUpdate();
}
 
//==============================================================================
ApplicationCommandInfo* ApplicationCommandManager::getMutableCommandForID (CommandID commandID) const noexcept
{
    for (int i = commands.size(); --i >= 0;)
        if (commands.getUnchecked(i)->commandID == commandID)
            return commands.getUnchecked(i);
 
    return nullptr;
}
 
const ApplicationCommandInfo* ApplicationCommandManager::getCommandForID (CommandID commandID) const noexcept
{
    return getMutableCommandForID (commandID);
}
 
String ApplicationCommandManager::getNameOfCommand (CommandID commandID) const noexcept
{
    if (auto* ci = getCommandForID (commandID))
        return ci->shortName;
 
    return {};
}
 
String ApplicationCommandManager::getDescriptionOfCommand (CommandID commandID) const noexcept
{
    if (auto* ci = getCommandForID (commandID))
        return ci->description.isNotEmpty() ? ci->description
                                            : ci->shortName;
 
    return {};
}
 
StringArray ApplicationCommandManager::getCommandCategories() const
{
    StringArray s;
 
    for (int i = 0; i < commands.size(); ++i)
        s.addIfNotAlreadyThere (commands.getUnchecked(i)->categoryName, false);
 
    return s;
}
 
Array<CommandID> ApplicationCommandManager::getCommandsInCategory (const String& categoryName) const
{
    Array<CommandID> results;
 
    for (int i = 0; i < commands.size(); ++i)
        if (commands.getUnchecked(i)->categoryName == categoryName)
            results.add (commands.getUnchecked(i)->commandID);
 
    return results;
}
 
//==============================================================================
bool ApplicationCommandManager::invokeDirectly (CommandID commandID, bool asynchronously)
{
    ApplicationCommandTarget::InvocationInfo info (commandID);
    info.invocationMethod = ApplicationCommandTarget::InvocationInfo::direct;
 
    return invoke (info, asynchronously);
}
 
bool ApplicationCommandManager::invoke (const ApplicationCommandTarget::InvocationInfo& inf, bool asynchronously)
{
    // This call isn't thread-safe for use from a non-UI thread without locking the message
    // manager first..
    JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
 
    bool ok = false;
    ApplicationCommandInfo commandInfo (0);
 
    if (auto* target = getTargetForCommand (inf.commandID, commandInfo))
    {
        ApplicationCommandTarget::InvocationInfo info (inf);
        info.commandFlags = commandInfo.flags;
 
        sendListenerInvokeCallback (info);
        ok = target->invoke (info, asynchronously);
        commandStatusChanged();
    }
 
    return ok;
}
 
//==============================================================================
ApplicationCommandTarget* ApplicationCommandManager::getFirstCommandTarget (CommandID)
{
    return firstTarget != nullptr ? firstTarget
                                  : findDefaultComponentTarget();
}
 
void ApplicationCommandManager::setFirstCommandTarget (ApplicationCommandTarget* newTarget) noexcept
{
    firstTarget = newTarget;
}
 
ApplicationCommandTarget* ApplicationCommandManager::getTargetForCommand (CommandID commandID,
                                                                          ApplicationCommandInfo& upToDateInfo)
{
    auto* target = getFirstCommandTarget (commandID);
 
    if (target == nullptr)
        target = JUCEApplication::getInstance();
 
    if (target != nullptr)
        target = target->getTargetForCommand (commandID);
 
    if (target != nullptr)
    {
        upToDateInfo.commandID = commandID;
        target->getCommandInfo (commandID, upToDateInfo);
    }
 
    return target;
}
 
//==============================================================================
ApplicationCommandTarget* ApplicationCommandManager::findTargetForComponent (Component* c)
{
    auto* target = dynamic_cast<ApplicationCommandTarget*> (c);
 
    if (target == nullptr && c != nullptr)
        target = c->findParentComponentOfClass<ApplicationCommandTarget>();
 
    return target;
}
 
ApplicationCommandTarget* ApplicationCommandManager::findDefaultComponentTarget()
{
    auto* c = Component::getCurrentlyFocusedComponent();
 
    if (c == nullptr)
    {
        if (auto* activeWindow = TopLevelWindow::getActiveTopLevelWindow())
        {
            if (auto* peer = activeWindow->getPeer())
            {
                c = peer->getLastFocusedSubcomponent();
 
                if (c == nullptr)
                    c = activeWindow;
            }
        }
    }
 
    if (c == nullptr)
    {
        auto& desktop = Desktop::getInstance();
 
        // getting a bit desperate now: try all desktop comps..
        for (int i = desktop.getNumComponents(); --i >= 0;)
            if (auto* component = desktop.getComponent (i))
                if (isForegroundOrEmbeddedProcess (component))
                    if (auto* peer = component->getPeer())
                        if (auto* target = findTargetForComponent (peer->getLastFocusedSubcomponent()))
                            return target;
    }
 
    if (c != nullptr)
    {
        // if we're focused on a ResizableWindow, chances are that it's the content
        // component that really should get the event. And if not, the event will
        // still be passed up to the top level window anyway, so let's send it to the
        // content comp.
        if (auto* resizableWindow = dynamic_cast<ResizableWindow*> (c))
            if (auto* content = resizableWindow->getContentComponent())
                c = content;
 
        if (auto* target = findTargetForComponent (c))
            return target;
    }
 
    return JUCEApplication::getInstance();
}
 
//==============================================================================
void ApplicationCommandManager::addListener (ApplicationCommandManagerListener* listener)
{
    listeners.add (listener);
}
 
void ApplicationCommandManager::removeListener (ApplicationCommandManagerListener* listener)
{
    listeners.remove (listener);
}
 
void ApplicationCommandManager::sendListenerInvokeCallback (const ApplicationCommandTarget::InvocationInfo& info)
{
    listeners.call ([&] (ApplicationCommandManagerListener& l) { l.applicationCommandInvoked (info); });
}
 
void ApplicationCommandManager::handleAsyncUpdate()
{
    listeners.call ([] (ApplicationCommandManagerListener& l) { l.applicationCommandListChanged(); });
}
 
void ApplicationCommandManager::globalFocusChanged (Component*)
{
    commandStatusChanged();
}
 
} // namespace juce