Function FavoriteButton

external/ImFileDialog/ImFileDialog.cpp:224–278

		return ret;
	}
	bool FavoriteButton(const char* label, bool isFavorite)
	{
		ImGuiContext& g = *GImGui;
		ImGuiWindow* window = g.CurrentWindow;

		ImVec2 pos = window->DC.CursorPos;
		bool ret = ImGui::InvisibleButton(label, ImVec2(GUI_ELEMENT_SIZE, GUI_ELEMENT_SIZE));
		
		bool hovered = ImGui::IsItemHovered();
		bool active = ImGui::IsItemActive();

		float size = g.LastItemData.Rect.Max.x - g.LastItemData.Rect.Min.x;

		int numPoints = 5;
		float innerRadius = size / 4;
		float outerRadius = size / 2;
		float angle = PI / numPoints;
		ImVec2 center = ImVec2(pos.x + size / 2, pos.y + size / 2);

		// fill
		if (isFavorite || hovered || active) {
			ImU32 fillColor = 0xff00ffff;// ImGui::ColorConvertFloat4ToU32(ImGui::GetStyle().Colors[ImGuiCol_Text]);
			if (hovered || active)
				fillColor = ImGui::ColorConvertFloat4ToU32(ImGui::GetStyle().Colors[active ? ImGuiCol_HeaderActive : ImGuiCol_HeaderHovered]);

			// since there is no PathFillConcave, fill first the inner part, then the triangles
			// inner
			window->DrawList->PathClear();
			for (int i = 1; i < numPoints * 2; i += 2)
				window->DrawList->PathLineTo(ImVec2(center.x + innerRadius * sin(i * angle), center.y - innerRadius * cos(i * angle)));
			window->DrawList->PathFillConvex(fillColor);

			// triangles
			for (int i = 0; i < numPoints; i++) {
				window->DrawList->PathClear();

				int pIndex = i * 2;
				window->DrawList->PathLineTo(ImVec2(center.x + outerRadius * sin(pIndex * angle), center.y - outerRadius * cos(pIndex * angle)));
				window->DrawList->PathLineTo(ImVec2(center.x + innerRadius * sin((pIndex + 1) * angle), center.y - innerRadius * cos((pIndex + 1) * angle)));
				window->DrawList->PathLineTo(ImVec2(center.x + innerRadius * sin((pIndex - 1) * angle), center.y - innerRadius * cos((pIndex - 1) * angle)));

				window->DrawList->PathFillConvex(fillColor);
			}
		}

		// outline
		window->DrawList->PathClear();
		for (int i = 0; i < numPoints * 2; i++) {
			float radius = i & 1 ? innerRadius : outerRadius;
			window->DrawList->PathLineTo(ImVec2(center.x + radius * sin(i * angle), center.y - radius * cos(i * angle)));
		}
		window->DrawList->PathStroke(ImGui::ColorConvertFloat4ToU32(ImGui::GetStyle().Colors[ImGuiCol_Text]), true, 2.0f);

		return ret;
	}
	bool FileIcon(const char* label, bool isSelected, ImTextureID icon, ImVec2 size, bool hasPreview, int previewWidth, int previewHeight)
	{
		ImGuiStyle& style = ImGui::GetStyle();