It's something for you to benchmark before writing the application, I guess.
On Wed, Oct 12, 2011 at 10:44 PM, qtnext <[email protected]> wrote: > so I can add for example 10 000 Items and Scenegraph will do all > necessary cliping (for example graphicsView Chip demo will works ? just > simply porting to qml/SceneGraph ?) > > > Le 12/10/2011 21:38, Ville M. Vainio a écrit : >> If graphics view delivered acceptable performance, QML will as too - >> especially with Qt5, through the virtue of Scene Graph. If your >> scenario would more naturally be done with QPainter, you can use >> QSGPantedItem. >> >> On Wed, Oct 12, 2011 at 9:43 PM, qtnext<[email protected]> wrote: >>> Yes but How to port the timeline (imagine porting blender3d to QML ?) : >>> I was using QGraphicsView : If I have a lot of elements will it be smooth ? >>> >>> >>> Le 09/10/2011 17:24, Ville M. Vainio a écrit : >>>> - I'm sure there will be a standard tree widget component, it's >>>> mandatory for any serious toolkit >>>> >>>> - You will still be able to do custom drawing with QPainter, >>>> http://doc.qt.nokia.com/qt5-snapshot/qsgpainteditem.html >>>> >>>> - I wouldn't use QAbstractItemModel for small-to-medium size models. >>>> QML does not mandate (or even encourage) using it by any means. >>>> >>>> On Sun, Oct 9, 2011 at 5:28 PM, qtnext<[email protected]> wrote: >>>>> Hi, >>>>> >>>>> I am planning to develop a non linear video system editor (After Effect, >>>>> Final Cut Like)... The main Widget of this kind of software is the >>>>> Timeline (composed of layers, in which you can add key frame, and on the >>>>> left panel you can directly set value of the keyframes). you can see >>>>> the curve between keyframe, hide layers, ... zoom, unzoom, scroll.. >>>>> >>>>> >>>>> - I have develop similar software years ago : first Qt2 or 3 (don't >>>>> remenber) : using Qpainter and adding removing visible items in the >>>>> timeline on the fly... >>>>> >>>>> - Then I have do that for another software with QGraphicsView : Easy ! >>>>> you add all the items in qgraphicsScene And Qt do all the job to manage >>>>> the large number of items... I have a QtreeWidget to change property of >>>>> each keyframe on the left... It was working fine ! But when you wants to >>>>> customize some parts in the QtreeWidget it was not very easy ... >>>>> >>>>> - Now I plan to use Qt Quick /Qt5 (I know it's not ready to use now ... >>>>> but it's a project for next year !) : >>>>> I plan to replace all the widgets (QTreeWidget/QgraphicsWidget) by a Qml >>>>> and QAbstractModel : it will be more flexible to use javascript, easier >>>>> to break rectangular area, effects, .... But How can I do that in QML >>>>> efficiently ? I will have a large numbers of items ... In short how to >>>>> code what can be easily and efficiently done with QGraphicsView ? >>>>> >>>>> _______________________________________________ >>>>> Qt5-feedback mailing list >>>>> [email protected] >>>>> http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback >>>>> >>> _______________________________________________ >>> Qt5-feedback mailing list >>> [email protected] >>> http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback >>> > > _______________________________________________ > Qt5-feedback mailing list > [email protected] > http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback > _______________________________________________ Qt5-feedback mailing list [email protected] http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback
