JonKazama-Hellion/HellionChat
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feat(ui): add scroll-to-bottom button to the chat log

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Jon Kazama
2026-05-21 12:29:58 +02:00
parent e0289962b1
commit 3de6e4a3cb
1 changed files with 38 additions and 2 deletions
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HellionChat/Ui/ChatLogWindow.cs
+38 -2
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@@ -776,6 +776,10 @@ public sealed class ChatLogWindow : Window
// (~17ms at 60fps) late, invisible inside the post-reload Atlas-Build.
private bool _firstFrameDone;
// UI-5: set when the user clicks the scroll-to-bottom button; the next
// frame's scroll-snap check forces a jump to the live end.
private bool _scrollToBottomRequested;
public override void Draw()
{
DrewThisFrame = true;
@@ -1558,10 +1562,13 @@ public sealed class ChatLogWindow : Window
using (ImRaii.PushStyle(ImGuiStyleVar.ItemSpacing, Vector2.Zero))
DrawMessages(tab, handler, false);
if (switchedTab || ImGui.GetScrollY() >= ImGui.GetScrollMaxY())
if (switchedTab || _scrollToBottomRequested || ImGui.GetScrollY() >= ImGui.GetScrollMaxY())
ImGui.SetScrollHereY(1f);
_scrollToBottomRequested = false;
handler.Draw();
DrawScrollToBottomButton();
}
private void DrawLogTableStyle(Tab tab, PayloadHandler handler, bool switchedTab)
@@ -1588,12 +1595,41 @@ public sealed class ChatLogWindow : Window
// Custom styles can have cellPadding that go above 4, which GetScrollY isn't respecting
var cellPaddingOffset =
!compact && oldCellPadding.Y > 4f ? oldCellPadding.Y - 4f : 0f;
if (switchedTab || ImGui.GetScrollY() + cellPaddingOffset >= ImGui.GetScrollMaxY())
if (switchedTab || _scrollToBottomRequested
|| ImGui.GetScrollY() + cellPaddingOffset >= ImGui.GetScrollMaxY())
ImGui.SetScrollHereY(1f);
_scrollToBottomRequested = false;
handler.Draw();
}
}
// Draw the scroll-to-bottom button after EndTable so it renders as a
// post-table overlay, not inside an active table cell. The outer
// ItemSpacing=Zero push has ended; restore normal spacing so the button
// position matches the DrawLogNormalStyle path.
using (ImRaii.PushStyle(ImGuiStyleVar.ItemSpacing, oldItemSpacing))
DrawScrollToBottomButton();
}
// UI-5: floating jump-to-latest button, shown only while the user has
// scrolled up from the live end. Pinned to the bottom-right of the visible
// viewport inside the scrolling child (cursor coords are content-space, the
// viewport is [ScrollY, ScrollY + WindowHeight]).
private void DrawScrollToBottomButton()
{
if (ImGui.GetScrollMaxY() - ImGui.GetScrollY() <= 1f)
return;
var size = ImGui.GetFrameHeight();
var pad = 8f * ImGuiHelpers.GlobalScale;
ImGui.SetCursorPosX(ImGui.GetScrollX() + ImGui.GetWindowWidth() - size - pad);
ImGui.SetCursorPosY(ImGui.GetScrollY() + ImGui.GetWindowHeight() - size - pad);
if (ImGuiUtil.IconButton(
FontAwesomeIcon.ArrowDown,
tooltip: HellionStrings.ChatLog_ScrollToBottom_Tooltip))
_scrollToBottomRequested = true;
}
private void DrawMessages(