I have implemented Angular Material's virtual scrolling for fixed sized items. Now I want to use it with non-fixed items. The challenge is twofold:
The items contain a text that is wrapping around multiple lines. Thus, the height of an item depends on (a) the length of the text and (b) the width of the item's container. The latter depends on the width of the browser window.
The items are displayed in a flex box in wrap-around mode. Thus, there are multiple items in each row, the number depending on the width of the browser viewport.
My question is: Can that be achieved by implementing a custom VirtualScrollStrategy? If so, how would I approach it? Are there examples anywhere?
Related
Is there a way in Vaadin 7 or Vaadin 8 to move the save/cancel buttons to under the last editor column? Or maybe to left justify them? Right now they are right justified under the last column. I would even take left justifying them under this same column. Visually, it is far from the last thing the users edited, so some users get confused. The way I am clarifying it for users right now is by making the Grid as narrow as possible, but it wastes screen real estate.
This will be very difficult in generic case, where column widths can be freely adjusted or their widths are automatically calculated by content. However if you set your columns fixed widths, so that you can make assumptions based on that within your specific application, there is a solution.
Just noting, that the Editor has div, with class name "v-grid-editor-footer", which has the same width as the Grid. So the editor footer does not have logical cells, that would be aligned with Grid's cells. And that is the challenge here. Furthermore the buttons you are refering to are wrapped in a child div of the previous one, with class name "v-grid-editor-buttons"
However you can try to add css rules in your theme in the following way.
.v-grid-editor-buttons {
position: relative;
left: -300px; // Adjust this value experimentally so that it fits your need
}
Below is a screenshot the css applied to Vaadin's Sampler.
Is there a way to add more than 2 components in HorizontalSplit panel without nesting it?
Splitter position should be based on the space allocated for the component. There is nesting of horizontal split panel but the splitter position is not set based on the component visible space
If you want a separate resizable split area for each of those components, then no, you cannot do that with just one split panel and nesting is indeed the solution. If you are fine with just one split, then you can add a layout instead of a component and just keep inserting more components to the layout.
You can use splitPanel.setSplitPosition for adjusting the split position. If your desired split position isn't static and your contents don't have fixed sizes, you could possibly use a tool like SizeReporter add-on for querying the content sizes. Note that this will undeniably cause some flickering, because you need to add the component to the layout before you can measure its size.
A horizontal splitpanel allows one component on the left and one on the right side.
Nothing more
What do you want to achieve?
If you add two layouts to HorizontalSplit there is nothing stopping you in adding more than one component to those layouts. You can also add new SplitLayouts to existing splitlayouts if you want that.
My use-case is like this:
The user defined some tags (text like "#asdf", "#qwerty", "#let_me_think_about_it" and "#decide later"). I want to display these in a box without scrolling (and don't know, how many tags the user created until I display the box).
The box itself should not be scrollable at all but be shown in a UITableViewCell (which is being scrolled). So it must compute the proposed height and respond to Autolayout mechanisms. If a (ARM) Mac user resizes the window to be smaller than before (or an iOS user rotates the device), the box should increase/decrease its height, as necessary (within the limits of Autolayout, since I know of some issues). Each of the tags should be (de)selectable at the same time (UILabel with UITapGestureRegognizer attachted?) and be able to displayed 'selected' (via a background view).
So, the box should primary try to align all content horizontal. If There's not enough horizontal space, do a "line break" and continue on the next "line".
My current solution is a UIScrollView that the user can scroll horizontal and tap any of the (UILabel) views. The displayed views itself are being loaded from a NIB file, like a UITableView does. The issue here is that not any of the selected tags might be visible at the first glance.
If there was no Autolayout, I'd exactly know what to do. But since there it is, I want to use Autolayout in my NIB files and wonder what you would do?
(How do you compute the required width of such a view and decide when a line break is to be done (and how?))
I think I need a simple hint. But if it needs code to explain, ObjC and Swift is both acceptable. :-)
So, the box should primary try to align all content horizontal. If There's not enough horizontal space, do a "line break" and continue on the next "line".
This sounds like a job for UICollectionView with UICollectionViewFlowLayout. You can disable scrolling, and the layout object will tell you the size of the content so that you can adjust the size of the box.
(How do you compute the required width of such a view and decide when a line break is to be done (and how?))
If you're doing it yourself, you add up the widths of all the items on the first line, and if it's larger than the available space, you move the item that extends past the limit and any subsequent items to the next line. Repeat as needed. But that's exactly what a flow layout does for a collection view, so there's no need to roll your own.
I want to combine text and images in a view (not using UIWebView) and I want to make the content appear according to the width of the inner view predefined by me. If it's content overflows the content size of that inner view, I want it to overflow to the next view (column right next to the previous one).
Summary: I want to combine both text and images like a newspaper page; fixed width columns all next to each other.
I am trying to create a custom UIScrollView but it becomes more complex in every step and I don't feel safe about this method.
I am using RichTextBlock component in Windows 8 where I can easily add Text or Image objects. I hope to find a similar component but I still haven't.
Are there any other easier methods or ready-to-use libraries made for a similar thing?
(please forgive my english)
I'm new at IOS developing but I've a good skill on other programming languages (mainly c#).
I'm trying to develop a test app with a main window.
Inside that window there is a scrollview with fixed size. inside that scrollviewer there is a view containing some stacked couples of one TextField and one Label: I can't know - ad design time - how many "rows" of them I have to put into.
My problems is:
I can put on the view the first couple (a textfield and, next, a label). Label size can be one or several rows high ,so I've to set multiline and sizeToFit
How can I put the second couple (and so on) without overlap the existing labels..? I can't use a table because between rows there are other labels (title of section).
Do I have to calculate the height of each label and programmatically calculate where to draw the next? Is there a more efficient way?
I don't need code, please just some hints or some keyword to googling on.
Many thanks.
I don't see why you can't use a UITableView, you can set up cells with all the controls you need in it. Either way, using a UITableview won't make the job any easier (just more memory efficient if you have many rows).
The only way that I see is, as you said, to calculate where the next 'row' should be placed (depending on the height of your previous rows). You'll also need to calculate the entire height, in order to set it to the contentSize of the UIScrollView.
Instead of UILabel you can also use a non editable UITextView, since it'll be easier to get its size (after you set the text, you can set the size of a UITextView to be equal to its contentSize)