c++ - QML and QQuickImageProvider size -


i have writen qml application shows qimages image provider. wrote class inherits qquickimageprovider. in qml have 2 image objects.

columnlayout {     rowlayout {         image {             source: "image://backend/1"             width: parent.width/2         }         image {             source: "image://backend/1"             width: parent.width/2         }

and code of provider:

qimage qmlprovider::requestimage(const qstring &id, qsize *size, const qsize &requestedsize) {     qsize req(requestedsize.width()<0?100:requestedsize.width(),               requestedsize.height()<0?100:requestedsize.height());     try {         qimage ret=assign.at(id)->scaled(req,qt::keepaspectratio);         *size=ret.size();         return ret;     }     catch( out_of_range ) {         qimage ret(req,qimage::format_rgb16);         *size=ret.size();     ret.fill(qcolor(qrand()/(rand_max/255),qrand()/(rand_max/255),qrand()/(rand_max/255)).rgba());          return ret;     } }

it works far means picture ist shown. want these pictures scaled. want each picture fill 1 half of application window, doesn't work. each width set ignored , image provider every time invalid requested size.

what have achive this?

since item's size managed layout should set layout's preferred size instead of item's size:

rowlayout {     anchors.fill: parent     image {         source: "image://backend/1"         layout.preferredheight: parent.height         layout.preferredwidth: parent.width / 2     }     image {         source: "image://backend/1"         layout.preferredheight: parent.height         layout.preferredwidth: parent.width / 2     } }

more info found here


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