Short question - what is the real difference put in easy and understandable words?..
Extracts from MSDN:
Contained - Depending on the direction of the navigation, focus returns to the first or the last item when the end or the beginning of the container is reached, but does not move past the beginning or end of the container.
Cycle - Depending on the direction of the navigation, the focus returns to the first or the last item when the end or the beginning of the container is reached. Focus cannot leave the container using logical navigation.
The difference is in the last part of the description of those modes. But I cannot understand it. Can anyone explain it in a more humane way?
The KeyboardNavigation class defines three attached properties that allow the modification of each of the navigation modes:
KeyboardNavigation.TabNavigation,
KeyboardNavigation.DirectionalNavigation,
KeyboardNavigation.ControlTabNavigation
Each of these properties defines six possible values.These values specifies how the navigation can be done in a list control(eg:ListBox,listview)
for instance;
KeyboardNavigation.DirectionalNavigation="Contained"
is used to indicate that when i press the down or up arrow in the keyboard to navigate between items in a list,the navigation stops at the last item or first item,then we have to use the opposite button to navigate further up or down.
KeyboardNavigation.DirectionalNavigation="Cycle"
is used to indicate that when i press the down or up arrow in the keyboard to navigate between items in a list,the navigation continues from the top or bottom item in a cyclic manner
same is the case with TabNavigation which indicate the navigation mode when we press the tab button in a list
Related
As per the react-scroll readme, we have to pass in
to="target"
props to help in tracking the element and also to navigate to the element when clicked.
We have a use-case where we need to make the link active some pixels before the element reaches the top. And, when clicked on the link, it should navigate to where the start of the element.
I tried setting
offset={-200}
to negative values. It solves the use-case of making the link active even before the element reaches the top. But, when clicked on the link, it navigates to the element with set offset, meaning, not bringing the element to the top and adding the offset pixel.
How can we customise these two behaviours? In case of click, the navigation point should be the start of element and in case of scrolling the link should become active even before the start of element is reached.
I think, if we can stop the navigate to behaviour of Link somehow then we can use onClink callback function to scroll to an element start while keeping the scrolling with mouse behaviour working with desired offset.
Please let me know if you have a way out. Thanks in advance!!
I have this animated graph on my website that you have to scroll a bit down to get to. The animation always happens immediately meaning that no one can see it actually being made since they haven't scrolled down yet. I was wondering if there is any way to make it so that that element only appears when the user scrolls to that portion of the screen?
npm i react-bottom-scroll-listener
please refer https://github.com/karl-run/react-bottom-scroll-listener#readme this gives you a listener where you can set a condition and enable it
I have an editor that is supposed to have entities with the props name, color, start, end. In the editor the text in positions denoted by start and end will be subsistuted by name, and it will be rendered by a custom component with contentEditable=false.
This works great with draftjs in general but there are a couple of issues:
When moving the cursor with the keyboard arrows, the entities are skipped over, which is good. But when an entity is at the very end of the input and I try to move rightwards past it (either just with right arrow or with option or cmd + right) the cursor disappears and doesn't come back when I move left again.
If I go right to the left of an entity and push shift + option + right arrow, the entity is selected as expected. But if I then press left arrow the cursor is also lost.
I could fix this by making sure there is always a whitespace after such a last entity, but that seems hacky and probably has edge cases.
Another option is to not use contentEditable=false, but that creates other issues with my actual app, which has a more complicated entity component including a dropdown, and I will have to manually make sure the user can't change text inside the entities etc.
Here is a reproduction of the issue: https://codesandbox.io/s/competent-surf-st77i
Any ideas?
On a given form, we replace one component with another.
The original component is a series of TextFields, and the new form is some informational text and a button. We hide the first one, and show the second one (the UI designer has both Containers within the form).
I tried using scrollRectToVisible with various values but it didn't seem to make any difference with the scrolling.
continueButtonContainer.setHidden(false);
f.forceRevalidate();
Button continueButton =
(Button)StateMachine.GetInstance().findByName("ButtonContinue", f);
f.scrollComponentToVisible(continueButtonContainer);
f.scrollComponentToVisible(continueButton);
I'm expecting the continue button to be near the top of the screen.
If the screen was scrolled before displaying the continue button, the button ends up right at the bottom of the screen (it was below the bottom of the screen before I put in the scrollComponentToVisible line(s).
After the user scrolls the screen, the button goes up to where it needs to be, and stays there.
If the screen is not scrolled, the button appears where it should be.
I know I can probably add some invisible containers underneath the button and force them onto the screen, but I would rather have a slightly more robust solution.
There are a few issues with this. First you are using forceRevalidate which should be used in very rare cases.
Second it seems that you are invoking this on a Form, this is a bit misleading. While it seems that:
f.add(myCmp);
Adds a component to the form it is really a synonym to:
f.getContentPane().add(myCmp);
That's important because you need to invoke the scrollComponentToVisible on the scrollable container which will actually do the work and ideally be the direct parent of said component. I'm assuming it's the content pane in your case but it depends on layout etc.
The last part is letting the layout do its job. If you are invoking this before the form is showing this might not work. Notice that doing it after a call to show is meaningless as the form might take time with transitions. You can use a show listener or override the laidOut callback method to perform things like this.
I am working on a defect in my GTK code for displaying context menus. After creating a menu with a number of menu items, I use gtk_menu_popup() to display the menu. This function takes a function pointer of type GtkMenuPositionFunc which lets me position the menu. I don't really do anything here except tell GTK to keep current position but push the menu in if part of the menu is outside the monitor (using the fourth argument to the function). My problem is that when GTK pushes the menu in, the absolute position of the menu items does not change. Hence their scroll position changes resulting in scroll bars in the menu. I want the relative position of the menu items w.r.t the menu to remain fixed. Is there any way I can do that? The GTK documentation does warn about this problem, but does not say anything about how to fix it. There is the link to it for reference:
http://library.gnome.org/devel/gtk/unstable/GtkMenu.html#GtkMenuPositionFunc
EDIT: I would have liked to include some code, but the logic is too scattered for that.
You don't need to provide a positioning function if you just want the default behavior. The default behavior is to keep the current position but make sure the menu fits on the monitor, so you can just pass NULL as the positioning function.
You can also take a look at how the default positioning function is written: http://git.gnome.org/browse/gtk+/tree/gtk/gtkmenu.c, gtk_menu_position() currently at line 4288.
PS. If your logic is too scattered to post a code sample, then you should consider cleaning it up.
I was not able to find any way to readjust the scroll-offset of menu items once the menu is pushed in. So, the workaround I used was to avoid having GTK push the menu in vertically. Hence, the original request was to create the menu at position (x,y) but resulted in length L of the menu going out of the screen, I reposition the menu at (x,y-L) in my position function. Similarly, if y<0 I change set it to (x,0). I still tell GTK to push in any menu that goes outside the screen to take care of menus going over the left and right margins.