1 files changed, 139 insertions, 0 deletions
diff --git a/src/main/java/com/anthonyhilyard/iceberg/util/Tooltips.java b/src/main/java/com/anthonyhilyard/iceberg/util/Tooltips.java
new file mode 100644
index 0000000..3761fc5
--- /dev/null
+++ b/src/main/java/com/anthonyhilyard/iceberg/util/Tooltips.java
@@ -0,0 +1,139 @@
+package com.anthonyhilyard.iceberg.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.mojang.blaze3d.matrix.MatrixStack;
+
+import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.renderer.Rectangle2d;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.text.ITextProperties;
+import net.minecraft.util.text.Style;
+import net.minecraftforge.client.event.RenderTooltipEvent;
+import net.minecraftforge.common.MinecraftForge;
+
+public class Tooltips
+{
+	public static Rectangle2d calculateRect(final ItemStack stack, MatrixStack mStack, List<? extends ITextProperties> textLines, int mouseX, int mouseY,
+												int screenWidth, int screenHeight, int maxTextWidth, FontRenderer font)
+	{
+		Rectangle2d rect = new Rectangle2d(0, 0, 0, 0);
+		if (textLines.isEmpty())
+		{
+			return rect;
+		}
+
+		// Generate a tooltip event even though we aren't rendering anything in case the event handlers are modifying the input values.
+		RenderTooltipEvent.Pre event = new RenderTooltipEvent.Pre(stack, textLines, mStack, mouseX, mouseY, screenWidth, screenHeight, maxTextWidth, font);
+		if (MinecraftForge.EVENT_BUS.post(event))
+		{
+			return rect;
+		}
+
+		mouseX = event.getX();
+		mouseY = event.getY();
+		screenWidth = event.getScreenWidth();
+		screenHeight = event.getScreenHeight();
+		maxTextWidth = event.getMaxWidth();
+		font = event.getFontRenderer();
+
+		int tooltipTextWidth = 0;
+
+		for (ITextProperties textLine : textLines)
+		{
+			int textLineWidth = font.width(textLine);
+			if (textLineWidth > tooltipTextWidth)
+			{
+				tooltipTextWidth = textLineWidth;
+			}
+		}
+
+		boolean needsWrap = false;
+
+		int titleLinesCount = 1;
+		int tooltipX = mouseX + 14;
+		if (tooltipX + tooltipTextWidth + 4 > screenWidth)
+		{
+			tooltipX = mouseX - 16 - tooltipTextWidth;
+			if (tooltipX < 4) // if the tooltip doesn't fit on the screen
+			{
+				if (mouseX > screenWidth / 2)
+				{
+					tooltipTextWidth = mouseX - 14 - 8;
+				}
+				else
+				{
+					tooltipTextWidth = screenWidth - 16 - mouseX;
+				}
+				needsWrap = true;
+			}
+		}
+
+		if (maxTextWidth > 0 && tooltipTextWidth > maxTextWidth)
+		{
+			tooltipTextWidth = maxTextWidth;
+			needsWrap = true;
+		}
+
+		if (needsWrap)
+		{
+			int wrappedTooltipWidth = 0;
+			List<ITextProperties> wrappedTextLines = new ArrayList<>();
+			for (int i = 0; i < textLines.size(); i++)
+			{
+				ITextProperties textLine = textLines.get(i);
+				List<ITextProperties> wrappedLine = font.getSplitter().splitLines(textLine, tooltipTextWidth, Style.EMPTY);
+				if (i == 0)
+				{
+					titleLinesCount = wrappedLine.size();
+				}
+
+				for (ITextProperties line : wrappedLine)
+				{
+					int lineWidth = font.width(line);
+					if (lineWidth > wrappedTooltipWidth)
+					{
+						wrappedTooltipWidth = lineWidth;
+					}
+					wrappedTextLines.add(line);
+				}
+			}
+			tooltipTextWidth = wrappedTooltipWidth;
+			textLines = wrappedTextLines;
+
+			if (mouseX > screenWidth / 2)
+			{
+				tooltipX = mouseX - 16 - tooltipTextWidth;
+			}
+			else
+			{
+				tooltipX = mouseX + 14;
+			}
+		}
+
+		int tooltipY = mouseY - 14;
+		int tooltipHeight = 8;
+
+		if (textLines.size() > 1)
+		{
+			tooltipHeight += (textLines.size() - 1) * 10;
+			if (textLines.size() > titleLinesCount)
+			{
+				tooltipHeight += 2; // gap between title lines and next lines
+			}
+		}
+
+		if (tooltipY < 4)
+		{
+			tooltipY = 4;
+		}
+		else if (tooltipY + tooltipHeight + 4 > screenHeight)
+		{
+			tooltipY = screenHeight - tooltipHeight - 4;
+		}
+
+		rect = new Rectangle2d(tooltipX - 4, tooltipY - 4, tooltipTextWidth + 8, tooltipHeight + 8);
+		return rect;
+	}
+}