c++ - Using QImage With QQuickImageProvider -


i have created class inherits qquickimageprovider class, want use requestimage() function of qquickimageprovider set qimage variable , dont know how need qimage variable class object , has been deifned in qml contextproperty , want use id variable index values retrieve qimage list. here main function code:

int main(int argc, char *argv[]) {     qapplication app(argc, argv);     imageprovider *imageprovider = new imageprovider;     qqmlapplicationengine engine;     pagebuffer p;    engine.rootcontext()->setcontextproperty("p",&p);    engine.load(qurl(qstringliteral("qrc:/main.qml")));    engine.addimageprovider("images", imageprovider);      return app.exec(); }

pagebuffer p contains list of qimages need present using qquick imageprovider when index value list has been selected user. here snippet of qml code want pass index value imageprovider, shows image element display 1 of elements list of qimages saved in pagebuffer object:

    image{                     x: 4                     y: 4                     height : imagerec.height                     visible: true                     width : imagerec.width                     anchors.fill: imagerec                     source:fileurl                     text{                         id:txt                         x: 0                         y: 71                         text:"sketch"+(index+1)                         horizontalalignment: txt.alignhcenter                         font.family: "tahoma"                         color:"#ffffff"                      }                      mousearea {                         anchors.rightmargin: -59                         anchors.bottommargin: -39                         anchors.fill: parent                         onclicked: {                             p.index=index;                             p.image=mod.get(index).fileurl                            images.image=p.img                           //  main.source="image://image/1"                      //                                main.source=p.image                                    //        console.log(mod.get(index).fileurl)                             //              main.source=p.image;                              //   currentimage=m.image;                         }                     }                 }

you can set objectname of p in c++ code. assume name myobject. can pass name (as string) image provider(imageprovider in case):

main.source="image://imageprovider/myobject"

as understand have own class, derived qquickimageprovider , overided requestimage. in case id "myobject". easy can real class objectname:

qquickwindow *window = qobject_cast<qquickwindow*>(engine.rootobjects()[0]);     pagebuffer *p = window->findchild<pagebuffer *>(id);

i don't sure accessing root item, check please.

updated:

you can declare imageprovider as:

imageprovider.h

class imageprovider : public qquickimageprovider { public:     imageprovider (qqmlengine *engine,imagetype type, flags flags = 0); private:     qqmlengine *m_engine; }

imageprovider.cpp

imageprovider ::imageprovider (qqmlengine *engine, imagetype type, flags flags)  :     qquickimageprovider(type,flags),     m_engine(engine) { }   qimage imageprovider ::requestimage(const qstring &id, qsize *size, const qsize &requestedsize) {     qquickwindow *window = qobject_cast<qquickwindow*>(m_engine.rootobjects()[0]);         pagebuffer *p = window->findchild<pagebuffer *>(id);     // p want }

main.cpp

int main(int argc, char *argv[]) {     qapplication app(argc, argv);     qqmlapplicationengine engine;     imageprovider *imageprovider = new imageprovider(&engine,qqmlimageproviderbase::image,0);      pagebuffer p;     engine.rootcontext()->setcontextproperty("p",&p);     engine.load(qurl(qstringliteral("qrc:/main.qml")));     engine.addimageprovider("images", imageprovider);     return app.exec(); }

Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more