Column can also have listview.builder, if the column builds all of its children at a time, does it build listview items at once too?
Column builds all of its children at once, but listview.builder builds lazily.
when you pass childrens: to ListView, it builds all at once. Only difference is Column shows all of its childrens in the screen while ListView has scroll functionality.
ListView takes a specific space of screen with 2 constraints on that top space & bottom space.
============ (top constraint/pixel)
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<This is the space of you ListView>
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============ (bottom constraint/pixel)
If you scroll up, it will detect that items have been scrolled through pixel constraints and lazy load the next items. So if your parent widget is whatever Container, Row, Column, it will always be able to lazy loading. And that is the main difference between Column & ListView.builder, Column build everything in 1 time, and ListView.builder can use lazy loading.
Related
Need to add like this. children should be parallel to fab.
Need to add speeddialchild children of FAB in a row instead of column.
In the above picture added speeddialchild in a column. How can i add speeddialchild in a row ?
I have three columns inside a row. The contents of the columns are generated by a listbuilder getting data from a database. Right now each column scrolls individually but I need them to scroll as one. Is this even possible in flutter or should I have made a gridview instead of three separate columns?
See https://stackoverflow.com/a/54879937/6447123
It works using a NotificationListener<ScrollNotification> plus an independent ScrollController for each scrollable Widget that should be synchronized.
You can use TrackingScrollController too
I have a Table in Flutter and I want to have it expand it's row so that the table takes up the full space that's available for it. Given that TableRow isn't a widget I can't use Expanded on it the way I would for Widgets in a Column. Is there another way to get similar behavior for a Table?
According to my information, you need to use the Row and Columns widgets instead of the Table widget and in addition to using the Expanded widget, or you will need to set a specific height for each row separately and it cannot be Flexible, Using Container in TableRow children
I am rendering at the moment a listview where each item is rendering again a listview. To remove an exception I set the inner listview property shrinkwrap to TRUE.
Now I can not scroll the outer grid anymore ONLY when I grab/tap the mouse pointer between the items of the outer listview. The inner listview shows the bouncing blue effect when I try to scroll.
I do not want that the outer listview scroll stops working.
The inner list should just be rendered as a plain static list of TWO key/value pairs just like:
1 tests 01:30 time
3 tests 00:05 time
2 tests 15:10 time
I am a flutter beginner so is there any better way than the nested listview?
How to create spreadhseet like Widget in Flutter (only for displaying data).
Currenly I have used Datatable but it does not support 1. fixed header 2. scrollable body.
I want following features:
The headers shoule be fixed.
the body should be scrollable (in both axes)
Currently my Datatable is inside a column > Expanded > SingleChildScrollView(horizontal) > SingleChildScrollView (vertical) > DataTable. Although I am able to scroll the complete Table in both the directions but 1. not simultaneously (i.e. it scrolls either horizontally or vertically), 2. Headers should not scroll, when scrolled vertically.
How can I achieve this ?
It seems that you need scroll controller that allows two or more scroll views to be in sync. In his case, you can use linked_scroll_controller plugin.
You can follow the example in this blog post for a step by step tutorial on how to achieve this.
Sample taken from the blog, check the complete source code here:
Here is an another package for this purpose: syncfusion_flutter_datagrid.
It has several features:
Editing - Allows users to edit cell values.
Sorting - Sort one or more columns in the ascending or descending order.
Stacked headers - Show unbound header rows.
Paging - Load data in segments.
Freeze Panes - Freeze the rows and columns when scrolling the grid.
And more, details in document
However, scrolling simultaneously is something different feature in this case.
You can try InteractiveViewer, but this not recommended in this case. Because both widgets, InteractiveViewer and DataTable, are very powerful widget that may build some conflict.