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MultiSelect: Box-Select: Fixed scrolling on high framerates.

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ocornut 2023-12-20 22:31:07 +01:00
parent 5d9de14493
commit 907268a430
2 changed files with 15 additions and 3 deletions
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1
imgui_internal.h
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@ -1721,6 +1721,7 @@ struct ImGuiBoxSelectState
ImGuiKeyChord KeyMods : 16; // Latched key-mods for box-select logic.
ImVec2 StartPosRel; // Start position in window-contents relative space (to support scrolling)
ImVec2 EndPosRel; // End position in window-contents relative space
ImVec2 ScrollAccum; // Scrolling accumulator (to behave at high-frame spaces)
ImGuiWindow* Window;
// Temporary/Transient data

17
imgui_widgets.cpp
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@ -7127,11 +7127,14 @@ static void BoxSelectStart(ImGuiID id, ImGuiSelectionUserData clicked_item)
bs->IsStartedFromVoid = (clicked_item == ImGuiSelectionUserData_Invalid);
bs->KeyMods = g.IO.KeyMods;
bs->StartPosRel = bs->EndPosRel = ImGui::WindowPosAbsToRel(g.CurrentWindow, g.IO.MousePos);
bs->ScrollAccum = ImVec2(0.0f, 0.0f);
}
static void BoxSelectScrollWithMouseDrag(ImGuiWindow* window, const ImRect& inner_r)
{
ImGuiContext& g = *GImGui;
ImGuiBoxSelectState* bs = &g.BoxSelectState;
IM_ASSERT(bs->Window == window);
for (int n = 0; n < 2; n++) // each axis
{
const float mouse_pos = g.IO.MousePos[n];
@ -7139,12 +7142,20 @@ static void BoxSelectScrollWithMouseDrag(ImGuiWindow* window, const ImRect& inne
const float scroll_curr = window->Scroll[n];
if (dist == 0.0f || (dist < 0.0f && scroll_curr < 0.0f) || (dist > 0.0f && scroll_curr >= window->ScrollMax[n]))
continue;
const float speed_multiplier = ImLinearRemapClamp(g.FontSize, g.FontSize * 5.0f, 1.0f, 4.0f, ImAbs(dist)); // x1 to x4 depending on distance
const float scroll_step = IM_ROUND(g.FontSize * 35.0f * speed_multiplier * ImSign(dist) * g.IO.DeltaTime);
const float scroll_step = g.FontSize * 35.0f * speed_multiplier * ImSign(dist) * g.IO.DeltaTime;
bs->ScrollAccum[n] += scroll_step;
// Accumulate into a stored value so we can handle high-framerate
const float scroll_step_i = ImFloor(bs->ScrollAccum[n]);
if (scroll_step_i == 0.0f)
continue;
if (n == 0)
ImGui::SetScrollX(window, scroll_curr + scroll_step);
ImGui::SetScrollX(window, scroll_curr + scroll_step_i);
else
ImGui::SetScrollY(window, scroll_curr + scroll_step);
ImGui::SetScrollY(window, scroll_curr + scroll_step_i);
bs->ScrollAccum[n] -= scroll_step_i;
}
}