add left item label api override

src/gui/input.cc

@@ -3,6 +3,8 @@
 #include <imgui/imgui.h>
 #include <imgui/imgui_internal.h>
 
+#include "absl/strings/string_view.h"
+
 namespace yaze {
 namespace gui {
 
@@ -21,5 +23,48 @@ bool InputHexShort(const char* label, int* data) {
                             ImGuiInputTextFlags_CharsHexadecimal);
 }
 
+void ItemLabel(absl::string_view title, ItemLabelFlags flags) {
+  ImGuiWindow* window = ImGui::GetCurrentWindow();
+  const ImVec2 lineStart = ImGui::GetCursorScreenPos();
+  const ImGuiStyle& style = ImGui::GetStyle();
+  float fullWidth = ImGui::GetContentRegionAvail().x;
+  float itemWidth = ImGui::CalcItemWidth() + style.ItemSpacing.x;
+  ImVec2 textSize = ImGui::CalcTextSize(title.begin(), title.end());
+  ImRect textRect;
+  textRect.Min = ImGui::GetCursorScreenPos();
+  if (flags & ItemLabelFlag::Right) textRect.Min.x = textRect.Min.x + itemWidth;
+  textRect.Max = textRect.Min;
+  textRect.Max.x += fullWidth - itemWidth;
+  textRect.Max.y += textSize.y;
+
+  ImGui::SetCursorScreenPos(textRect.Min);
+
+  ImGui::AlignTextToFramePadding();
+  // Adjust text rect manually because we render it directly into a drawlist
+  // instead of using public functions.
+  textRect.Min.y += window->DC.CurrLineTextBaseOffset;
+  textRect.Max.y += window->DC.CurrLineTextBaseOffset;
+
+  ImGui::ItemSize(textRect);
+  if (ImGui::ItemAdd(
+          textRect, window->GetID(title.data(), title.data() + title.size()))) {
+    ImGui::RenderTextEllipsis(
+        ImGui::GetWindowDrawList(), textRect.Min, textRect.Max, textRect.Max.x,
+        textRect.Max.x, title.data(), title.data() + title.size(), &textSize);
+
+    if (textRect.GetWidth() < textSize.x && ImGui::IsItemHovered())
+      ImGui::SetTooltip("%.*s", (int)title.size(), title.data());
+  }
+  if (flags & ItemLabelFlag::Left) {
+    ImVec2 result;
+    auto other = ImVec2{0, textSize.y + window->DC.CurrLineTextBaseOffset};
+    result.x = textRect.Max.x - other.x;
+    result.y = textRect.Max.y - other.y;
+    ImGui::SetCursorScreenPos(result);
+    ImGui::SameLine();
+  } else if (flags & ItemLabelFlag::Right)
+    ImGui::SetCursorScreenPos(lineStart);
+}
+
 }  // namespace gui
 }  // namespace yaze

src/gui/input.h

@@ -7,12 +7,22 @@
 #include <cstddef>
 #include <cstdint>
 
+#include "absl/strings/string_view.h"
+
 namespace yaze {
 namespace gui {
 
 IMGUI_API bool InputHex(const char* label, int* data);
 IMGUI_API bool InputHexShort(const char* label, int* data);
 
+using ItemLabelFlags = enum ItemLabelFlag {
+  Left = 1u << 0u,
+  Right = 1u << 1u,
+  Default = Left,
+};
+
+IMGUI_API void ItemLabel(absl::string_view title, ItemLabelFlags flags);
+
 }  // namespace gui
 }  // namespace yaze