suwako / ShaderPlayground

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ShaderPlayground / deps / imgui / imgui / imguiRowsBackground.h
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1#pragma once
2#include <imgui.h>
3#include <cstdint>
4#include <cctype>
5#include <utility>
6#include <vector>
7#include <string>
8#include <algorithm>
9
10//https://github.com/ocornut/imgui/issues/2668
11
12namespace ImGui
13{
14
15 void ItemRowsBackground(float lineHeight = -1.0f, const ImColor &color = ImColor(20, 20, 20, 64))
16 {
17 auto *drawList = ImGui::GetWindowDrawList();
18 const auto &style = ImGui::GetStyle();
19
20 if (lineHeight < 0)
21 {
22 lineHeight = ImGui::GetTextLineHeight();
23 }
24 lineHeight += style.ItemSpacing.y;
25
26 float scrollOffsetH = ImGui::GetScrollX();
27 float scrollOffsetV = ImGui::GetScrollY();
28 float scrolledOutLines = floorf(scrollOffsetV / lineHeight);
29 scrollOffsetV -= lineHeight * scrolledOutLines;
30
31 ImVec2 clipRectMin(ImGui::GetWindowPos().x, ImGui::GetWindowPos().y);
32 ImVec2 clipRectMax(clipRectMin.x + ImGui::GetWindowWidth(), clipRectMin.y + ImGui::GetWindowHeight());
33
34 if (ImGui::GetScrollMaxX() > 0)
35 {
36 clipRectMax.y -= style.ScrollbarSize;
37 }
38
39 drawList->PushClipRect(clipRectMin, clipRectMax);
40
41 bool isOdd = (static_cast<int>(scrolledOutLines) % 2) == 0;
42
43 float yMin = clipRectMin.y - scrollOffsetV + ImGui::GetCursorPosY();
44 float yMax = clipRectMax.y - scrollOffsetV + lineHeight;
45 float xMin = clipRectMin.x + scrollOffsetH + ImGui::GetWindowContentRegionMin().x;
46 float xMax = clipRectMin.x + scrollOffsetH + ImGui::GetWindowContentRegionMax().x;
47
48 for (float y = yMin; y < yMax; y += lineHeight, isOdd = !isOdd)
49 {
50 if (isOdd)
51 {
52 drawList->AddRectFilled({xMin, y - style.ItemSpacing.y}, {xMax, y + lineHeight}, color);
53 }
54 }
55
56 drawList->PopClipRect();
57 }
58
59}
60
61// Please do not forget this!
62//ImGui::Begin("Example Bug");
63//ItemRowsBackground();
64// whatever code that draws list or tree items
65//ImGui::End();