layout_locker.cpp

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#include "gui/graph_widget/layout_locker.h"
#include "gui/gui_globals.h"
#include "gui/graph_widget/contexts/graph_context.h"
 
namespace hal {
 
    LayoutLockerManager* LayoutLockerManager::inst = nullptr;
 
    LayoutLockerManager::LayoutLockerManager()
        : mLockCount(0) {;}
 
    LayoutLockerManager* LayoutLockerManager::instance()
    {
        if (!inst) inst = new LayoutLockerManager;
        return inst;
    }
 
    void LayoutLockerManager::addLock()
    {
        ++mLockCount;
    }
 
    void LayoutLockerManager::removeLock()
    {
        --mLockCount;
 
        if (mLockCount <= 0 && !mWaitingRoom.isEmpty())
        {
            for (u32 ctxId : mWaitingRoom)
            {
                GraphContext* ctx = gGraphContextManager->getContextById(ctxId);
                if (ctx) ctx->startSceneUpdate();
            }
            mWaitingRoom.clear();
        }
    }
 
    bool LayoutLockerManager::canUpdate(GraphContext* ctx)
    {
        if (!ctx) return false;
        if (mLockCount <= 0) return true;
        mWaitingRoom.insert(ctx->id());
        return false;
    }
 
    void LayoutLockerManager::removeWaitingContext(GraphContext* ctx)
    {
        auto it = mWaitingRoom.find(ctx->id());
        if (it != mWaitingRoom.end())
            mWaitingRoom.erase(it);
    }
 
    LayoutLocker::LayoutLocker()
    {
        LayoutLockerManager::instance()->addLock();
    }
 
    LayoutLocker::~LayoutLocker()
    {
        LayoutLockerManager::instance()->removeLock();
    }
}