Trying to force scroll of a page, but I'm having trouble.

[StrikerTheHedgefox]

In the event for one of my buttons, called UIFunc_OnConfigureBinds, which executes when I pick the configure binds button, or force it with a call to that function, I do this at the end:

nk_console_set_active_parent(configureBinds);
if (lastKeyBindWidget != 0)
{
	nk_console* keyButton = inputMenuList[lastKeyBindWidget].menuItem;
	nk_console_top_data* data = (nk_console_top_data*)nk_console_get_top(keyButton)->data;
	nk_console_set_active_widget(keyButton);
	if (data != NULL)
	{
		SDL_Log("Attempting to set scroll");
		data->scroll_to_widget = keyButton;
		data->input_processed = nk_true;
		lastKeyBindWidget = 0;
	}
}

But, for some reason, while it gets to "Attempting to set scroll", the scroll_to_widget doesn't work.

I need a way to force scroll a page to the widget in question, since this isn't reached via a traditional nk_console_navigate_back call.

[RobLoach]

If you switch the active widget in a post-render event, does it scroll to it? I know I was doing some updates on this a few weeks ago. Are you on the latest version?

[RobLoach]

Could be that the math to calculate the widget size and location is wrong?

[StrikerTheHedgefox]

I tried this too:

void UIFunc_ConfigureBindsRenderOnce(nk_console* button, void* user_data)
{
	TFURY_UNREFERENCED_PARAMETER(button);
	TFURY_UNREFERENCED_PARAMETER(user_data);
	
	if (lastKeyBindWidget != 0)
	{
		nk_console* keyButton = inputMenuList[lastKeyBindWidget].menuItem;
		nk_console_top_data* data = (nk_console_top_data*)nk_console_get_top(keyButton)->data;
		nk_console_set_active_widget(keyButton);
		if (data != NULL)
		{
			SDL_Log("Attempting to set scroll");
			data->scroll_to_widget = keyButton;
			data->input_processed = nk_true;
			lastKeyBindWidget = 0;
		}
	}
}

Same result.

And yes, on the latest version.

[StrikerTheHedgefox]

Yeah, could be having trouble calculating the bounds, maybe because its off-screen? Not sure.

[RobLoach]

Could you guess the scroll location with nk_window_set_scroll(ctx, 0, 150) ? That's super hacky. Not sure the best way around it... Seems to be scrolling to the active widget in the demos here. My best guess is calculating widget heights, but I'm really not sure.

[StrikerTheHedgefox]

I can do that sort of in NK_CONSOLE_EVENT_PRE_PARENT_RENDER, where I can set the scroll, but setting the active widget with nk_console_set_active_widget, only "hovers" the widget, rather than select it, so if I hit the movement keys, it goes all the way back to the top widget.

[StrikerTheHedgefox]

Hmm, got it working for the most part:

void UIFunc_ConfigureBindsRender(nk_console* widget, void* user_data)
{
	TFURY_UNREFERENCED_PARAMETER(widget);
	TFURY_UNREFERENCED_PARAMETER(user_data);
	// BRUTAL HACK: Every time we render the configure binds screen we have to check this, because
	// NK_CONSOLE_EVENT_POST_RENDER_ONCE is too late. This code forces the scroll and active widget
	// to the row belonging to the key we just bound, so we can scroll back to it.
	if (lastKeyBindWidget != 0)
	{
		nk_console* keyRow = inputMenuList[lastKeyBindWidget].row;
		if (configureBinds->ctx != NULL)
		{
			nk_console_top_data* data = (nk_console_top_data*)configureBinds->data;
			nk_console_set_active_widget(keyRow);
			nk_window_set_scroll(configureBinds->ctx, lastScrollX, lastScrollY);
			keyRow->activeWidget = inputMenuList[lastKeyBindWidget].menuItem;
			lastKeyBindWidget = 0;
		}
	}
}

[RobLoach]

Ah, maybe the row height is being calculated wrong 🙃 Glad you figured something out

[StrikerTheHedgefox]

I'm not so sure. I was finally able to get scroll_to_widget working if I applied the NK_CONSOLE_EVENT_POST_RENDER_ONCE event to the row itself, and set the scroll to the row. But, I ran into other issues with setting the active widget still.

[RobLoach]

Maybe it's something to do with this?

NK_API void nk_console_set_active_parent(nk_console* new_parent) {
    if (new_parent == NULL) {
        return;
    }

    nk_console* top = nk_console_get_top(new_parent);
    if (top == NULL) {
        return;
    }

    // When switching parents, bring the window scroll to the top to that the window doesn't appear empty.
    // TODO: Fix the scroll on the new window, since it may not be centered on the active widget.
    nk_window_set_scroll(top->ctx, 0, 0);

    nk_console_top_data* data = (nk_console_top_data*)top->data;
    data->active_parent = new_parent;
}

The nk_window_set_scroll(top->ctx, 0, 0); there breaking it?