Re: [Interest] Customzie Qtablemodel and selectionmodel.
Il 17/06/20 07:49, Milos Top ha scritto: But I can not implement "SelectionModel" on this model. For example, I want to select first record and last record. For now, If I select the first record and scroll to down then, I can not keep selections because the model is changed by scrolling. How is the model changed by scrolling, exactly? The issue with selection is that you need an valid index representing the last entry. So, you may lazy load the model data (based on views' requests), but the row count has to be accurate immediately. More than doable, anyhow. My 2 c, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts smime.p7s Description: Firma crittografica S/MIME ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Customzie Qtablemodel and selectionmodel.
> How can I solve this issue efficiently? > Or is there another way to load a list with hundreds of thousands of > records instantly? Take a look at https://doc.qt.io/qt-5/qabstractitemmodel.html#fetchMore and https://doc.qt.io/qt-5/qabstractitemmodel.html#canFetchMore. They let you load items lazily into a view. Best Regards, Jonathan Purol ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
[Interest] Customzie Qtablemodel and selectionmodel.
Hi. I love Qt. These days I have been working on Qt project with 5.15 of version. Here I have one issue on QTableView/Model. I have a playlist with hundreds of thousands of records. Each record has 100+ fields. It takes a little time to load all of the playlists fully. But my client wants me to load it instantly So I tried with custom model and scroll bar. What I tried is to load only visible records instead of loading all records. So the model is changed by SQL Query (ex: "Select * from t_list Order by name asc limit 30, 100") when scrolling. Everything is good. But I can not implement "SelectionModel" on this model. For example, I want to select first record and last record. For now, If I select the first record and scroll to down then, I can not keep selections because the model is changed by scrolling. How can I solve this issue efficiently? Or is there another way to load a list with hundreds of thousands of records instantly? Please reply me kindly. Best regards, Milos. ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
