imalign.cpp

namespace ImGui
{
	ImVec2 const AlignedCenter(0.5f, 0.5f);

	ImVec2 const AlignedLeft(0.0f, 0.5f);
	ImVec2 const AlignedTop(0.5f, 0.0f);
	ImVec2 const AlignedRight(1.0f, 0.5f);
	ImVec2 const AlignedBottom(0.5f, 1.0f);

	ImVec2 const AlignedTopLeft(0.0f, 0.0f);
	ImVec2 const AlignedTopRight(1.0f, 0.0f);
	ImVec2 const AlignedBottomLeft(1.0f, 1.0f);
	ImVec2 const AlignedBottomRight(1.0f, 1.0f);

	ImVec2 AlignWindowPercent(ImVec2 aPosPercent, ImVec2 aSize, ImVec2 anAchorPercent)
	{
		GC_Vector2f availableSize = ToVec2f(GetContentRegionAvail());
		GC_Vector2f startPos = ToVec2f(GetWindowPos());

		GC_Vector2f size = ToVec2f(aSize);
		GC_Vector2f offset = ToVec2f(anAchorPercent) * size;

		GC_Vector2f pos = startPos + availableSize * ToVec2f(aPosPercent) - offset;

		SetNextWindowPos(ToVec2(pos));
		return ToVec2(size);
	}

	void SetNextAlignment(ImVec2 aPercentAlignment, ImVec2 aSize)
	{
		SetNextTextAlignment(nullptr, aPercentAlignment, aSize);
	}

	void SetNextTextAlignment(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder)
	{
		// in some cases cursorpos is less than the content region (status/menu bar) try to preserve it
		ImVec2 min = ImMin(ImGui::GetCursorPos(), ImGui::GetWindowContentRegionMin());
		ImVec2 max = ImGui::GetWindowContentRegionMax();

		if (someText && someText[0])
		{
			ImVec2 textSize = CalcTextSize(someText, someText + strlen(someText), false, max.x - min.x) + aBorder;
			max -= textSize;
		}
		else
		{
			max -= aBorder;
		}

		ImVec2 cursorPos = ImGui::GetCursorPos();
		if (aPercentAlignment.x != -FLT_MAX) // main
			cursorPos.x = ImLerp(min.x, max.x, aPercentAlignment.x);
		if (aPercentAlignment.y != -FLT_MAX)
			cursorPos.y = ImLerp(min.y, max.y, aPercentAlignment.y);
		ImGui::SetCursorPos(cursorPos);
	}

	void SetNextButtonAlignment(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder)
	{
		SetNextTextAlignment(someText, aPercentAlignment, GetStyle().FramePadding * 2 + aBorder);
	}

	void AlignedText(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder)
	{
		SetNextTextAlignment(someText, aPercentAlignment, aBorder);
		ImGui::Text("%s", someText);
	}

	bool AlignedButton(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder)
	{
		SetNextButtonAlignment(someText, aPercentAlignment, aBorder);
		return ImGui::Button(someText);
	}
}

imalign.h

namespace ImGui
{
	extern ImVec2 const AlignedCenter;

	extern ImVec2 const AlignedLeft;
	extern ImVec2 const AlignedTop;
	extern ImVec2 const AlignedRight;
	extern ImVec2 const AlignedBottom;

	extern ImVec2 const AlignedTopLeft;
	extern ImVec2 const AlignedTopRight;
	extern ImVec2 const AlignedBottomLeft;
	extern ImVec2 const AlignedBottomRight;

	float const NoAlign = -FLT_MAX;

	ImVec2 AlignWindowPercent(ImVec2 aPosPercent, ImVec2 aSize, ImVec2 anAchorPercent = ImVec2(0.5f, 0.5f));

	void SetNextAlignment(ImVec2 aPercentAlignment, ImVec2 aSize = ImVec2(0,0));
	void SetNextTextAlignment(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder = ImVec2(0,0));
	void SetNextButtonAlignment(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder = ImVec2(0,0));
	inline void ResetAlignment() { SetNextAlignment(ImVec2(0,0)); }

	void AlignedText(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder = ImVec2(0,0));
	bool AlignedButton(char const* someText, ImVec2 aPercentAlignment, ImVec2 aBorder = ImVec2(0,0));
}