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Tables: use center-bias for horizontal borders to better support thick borders. (#9415)

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+ Demo: adjust colors in 'Background Color' section to better showcase the blending difference between Bg0 and Bg1.
This commit is contained in:
ocornut 2026-10-29 20:56:04 +01:00
parent 89845f9db6
commit f88ec043af
2 changed files with 9 additions and 5 deletions
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10
imgui_demo.cpp
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@ -6428,7 +6428,9 @@ static void DemoWindowTables()
{
static char text_bufs[3 * 5][16]; // Mini text storage for 3x5 cells
static bool init = true;
if (!show_widget_frame_bg)
if (show_widget_frame_bg)
ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 0.0f);
else
ImGui::PushStyleColor(ImGuiCol_FrameBg, 0);
for (int cell = 0; cell < 3 * 5; cell++)
{
@ -6440,7 +6442,9 @@ static void DemoWindowTables()
ImGui::InputText("##cell", text_bufs[cell], IM_COUNTOF(text_bufs[cell]));
ImGui::PopID();
}
if (!show_widget_frame_bg)
if (show_widget_frame_bg)
ImGui::PopStyleVar();
else
ImGui::PopStyleColor();
init = false;
ImGui::EndTable();
@ -7050,7 +7054,7 @@ static void DemoWindowTables()
// We use a transparent color so we can see the one behind in case our target is RowBg1 and RowBg0 was already targeted by the ImGuiTableFlags_RowBg flag.
if (row_bg_type != 0)
{
ImU32 row_bg_color = ImGui::GetColorU32(row_bg_type == 1 ? ImVec4(0.7f, 0.3f, 0.3f, 0.65f) : ImVec4(0.2f + row * 0.1f, 0.2f, 0.2f, 0.65f)); // Flat or Gradient?
ImU32 row_bg_color = ImGui::GetColorU32(row_bg_type == 1 ? ImVec4(0.7f, 0.3f, 0.3f, 0.40f) : ImVec4(0.2f + row * 0.1f, 0.2f, 0.2f, 0.40f)); // Flat or Gradient?
ImGui::TableSetBgColor(ImGuiTableBgTarget_RowBg0 + row_bg_target, row_bg_color);
}

4
imgui_tables.cpp
View File

@ -2216,11 +2216,11 @@ void ImGui::TableEndRow(ImGuiTable* table)
// Draw top border
if (top_border_col && bg_y1 >= table->BgClipRect.Min.y && bg_y1 < table->BgClipRect.Max.y)
window->DrawList->AddLineH(table->BorderX1, table->BorderX2, bg_y1, top_border_col, table->BorderSize);
window->DrawList->AddLineH(table->BorderX1, table->BorderX2, bg_y1, top_border_col, table->BorderSize, ImDrawFlags_StrokeCenterBiased);
// Draw bottom border at the row unfreezing mark (always strong)
if (draw_strong_bottom_border && bg_y2 >= table->BgClipRect.Min.y && bg_y2 < table->BgClipRect.Max.y)
window->DrawList->AddLineH(table->BorderX1, table->BorderX2, bg_y2, table->BorderColorStrong, table->BorderSize);
window->DrawList->AddLineH(table->BorderX1, table->BorderX2, bg_y2, table->BorderColorStrong, table->BorderSize, ImDrawFlags_StrokeCenterBiased);
}
// End frozen rows (when we are past the last frozen row line, teleport cursor and alter clipping rectangle)