Question: fine-tuning the window scrollbar

[ElectroidDes]

Version/Branch of Dear ImGui:

1.90.6

Back-ends:

imgui_impl_XXX.cpp + imgui_impl_XXX.cpp

Compiler, OS:

Windows 10

Full config/build information:

No response

Details:

Can you please tell me if Imgui has a function for adding “arrows” to fine-tune window scrolling?
It’s just that when there is a lot of “content” in the window, scrolling with the slider is very inaccurate - it’s difficult to position and find the desired element in the window, it constantly skips.

Of course, I completely made my own scrollbar by drawing them using ImGui::GetWindowDrawList() and setting up the logic, but this is not very convenient to use; it would be much more convenient and easier to use an already existing scrollbar with fine tuning.

[ocornut]

Since 1.90.8 scrollbar have been changed to scroll page by page when clicking outside the grab. (#7328)
Would that help?

[ElectroidDes]

Since 1.90.8 scrollbar have been changed to scroll page by page when clicking outside the grab. (#7328) Would that help?

Thanks, I checked it and it definitely improves the positioning accuracy of the scrollbar :)

[ElectroidDes]

scroll page works with this simple example:

   static int size = 10000;

    ImGui::Begin("Window text 1");

    for (int i = 0; i < size; ++i) 
    {
        ImGui::Text("This is line number %d", i);
    }
    ImGui::End();

However, when I try to use the same code with the ImGuiListClipper class, scrolling across the page doesn't seem to work - it scrolls more than one page:

    ImGui::Begin("Window text 2");

    ImGuiListClipper clipper;

    clipper.Begin(size, ImGui::GetTextLineHeight());

    while (clipper.Step())
    {
        for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; ++i)
        {
            ImGui::Text("This is line number %d", i);
        }
    }

    clipper.End();

    ImGui::End();

Perhaps I misunderstand something.

[GamingMinds-DanielC]

Perhaps I misunderstand something.

You are giving the clipper an explicit height that is too small, therefore it thinks that more lines will fit. GetTextLineHeight() will give you only the height of a line itself without the spacing to the next line, try GetTextLineHeightWithSpacing() instead.

[ElectroidDes]

Возможно, я что-то неправильно понимаю.

Вы задаете клипперу слишком маленькую высоту, поэтому он думает, что поместится больше линий. даст вам только высоту самой строки без интервала до следующей строки, попробуйте вместо этого.GetTextLineHeight()``GetTextLineHeightWithSpacing()

It works. Thank you very much!