LiteLoader / LiteLoader · Files

package com.mumfrey.liteloader.client.gui;

import static com.mumfrey.liteloader.client.util.GLClippingPlanes.*;
import static org.lwjgl.opengl.GL11.*;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiButton;

import org.lwjgl.input.Keyboard;

/**
 * Basic non-interactive scrollable panel using OpenGL clipping planes
 * 
 * TODO handle interaction
 * 
 * @author Adam Mummery-Smith
 */
class GuiScrollPanel extends GuiPanel
{
	private ScrollPanelContent content;
	
	/**
	 * Scroll bar for the panel
	 */
	private GuiSimpleScrollBar scrollBar = new GuiSimpleScrollBar();
	
	/**
	 * Left edge coord - specified 
	 */
	private int left;
	
	/**
	 * Top edge coord - specified
	 */
	private int top;
	
	/**
	 * 
	 */
	private int contentHeight;
	
	public GuiScrollPanel(Minecraft minecraft, ScrollPanelContent content, int left, int top, int width, int height)
	{
		super(minecraft);
		
		this.setContent(content);
	}
	
	public void setContent(ScrollPanelContent content)
	{
		if (content == null)
		{
			throw new IllegalArgumentException("Scroll pane content can not be null");
		}
		
		this.content = content;
	}
	
	@Override
	void setSize(int width, int height)
	{
		this.width = width;
		this.height = height;
		
		this.updateHeight();
	}
	
	public void setSizeAndPosition(int left, int top, int width, int height)
	{
		this.left = left;
		this.top = top;
		
		this.setSize(width, height);
	}

	public void updateHeight()
	{
		this.contentHeight = this.content.getScrollPanelContentHeight(this);
		this.scrollBar.setMaxValue(this.contentHeight - this.height);
	}
	
	public void scrollToBottom()
	{
		this.scrollBar.setValue(this.contentHeight);
	}

	public void scrollToTop()
	{
		this.scrollBar.setValue(0);
	}
	
	public void scrollBy(int amount)
	{
		this.scrollBar.offsetValue(amount);
	}
	
	public GuiButton addControl(GuiButton control)
	{
		this.controls.add(control);
		return control;
	}
	
	/**
	 * Draw the panel and chrome
	 * 
	 * @param mouseX
	 * @param mouseY
	 * @param partialTicks
	 */
	@Override
	public void draw(int mouseX, int mouseY, float partialTicks)
	{
		int scrollPosition = this.scrollBar.getValue();
		
		// Clip rect
		glEnableClipping(this.left, this.left + this.width - 6, this.top, this.top + this.height);
		
		// Offset by scroll
		glPushMatrix();
		glTranslatef(this.left, this.top - scrollPosition, 0.0F);
		
		this.content.drawScrollPanelContent(this, mouseX, mouseY, partialTicks, scrollPosition, this.height);
		
		super.draw(mouseX - this.left, mouseY + scrollPosition - this.top, partialTicks);
		
		// Disable clip rect
		glDisableClipping();
		
		// Restore transform
		glPopMatrix();
		
		// Update and draw scroll bar
		this.scrollBar.drawScrollBar(mouseX, mouseY, partialTicks, this.left + this.width - 5, this.top, 5, this.height, Math.max(this.height, this.contentHeight));
	}

	@Override
	public void mouseWheelScrolled(int mouseWheelDelta)
	{
		this.scrollBy(-mouseWheelDelta / 8);
	}

	@Override
	public void mousePressed(int mouseX, int mouseY, int mouseButton)
	{
		mouseY += this.scrollBar.getValue() - this.top;
		mouseX -= this.left;
		super.mousePressed(mouseX, mouseY, mouseButton);
		
		if (mouseX > 0 && mouseX < this.width && mouseY > 0 && mouseY < this.contentHeight)
		{
			this.content.scrollPanelMousePressed(this, mouseX, mouseY, mouseButton);
		}
		
		if (mouseButton == 0)
		{
			if (this.scrollBar.wasMouseOver())
				this.scrollBar.setDragging(true);
		}
	}

	@Override
	public void mouseReleased(int mouseX, int mouseY, int mouseButton)
	{
		if (mouseButton == 0)
		{
			this.scrollBar.setDragging(false);
		}
	}

	@Override
	public void keyPressed(char keyChar, int keyCode)
	{
		if (keyCode == Keyboard.KEY_UP) this.scrollBar.offsetValue(-10);
		if (keyCode == Keyboard.KEY_DOWN) this.scrollBar.offsetValue(10);
		if (keyCode == Keyboard.KEY_PRIOR) this.scrollBar.offsetValue(-this.height + 10);
		if (keyCode == Keyboard.KEY_NEXT) this.scrollBar.offsetValue(this.height - 10);
		if (keyCode == Keyboard.KEY_HOME) this.scrollBar.setValue(0);
		if (keyCode == Keyboard.KEY_END) this.scrollBar.setValue(this.contentHeight);
	}

	@Override
	void onTick()
	{
	}

	@Override
	void onHidden()
	{
	}

	@Override
	void onShown()
	{
	}

	@Override
	void mouseMoved(int mouseX, int mouseY)
	{
	}

	@Override
	void actionPerformed(GuiButton control)
	{
		this.content.scrollPanelActionPerformed(this, control);
	}
}