/*
   draw7: link item movements
*/

import java.awt.*;

public class Draw7 extends Draw6
{
   Item newItem() { return (Item)(new Item7()); }

   Item7 item7(int i) { return (Item7)item[i]; }

   int iLink = -1;
   int linkKey = -1;
   boolean isRight = false, isClick = false;
   Color linkBgColor = new Color(140,140,140);

   // RE-INITIALIZING ALSO CLEARS THE CURRENT LINK ITEM

   public void clear() {
      iLink = -1;
      linkKey = -1;
      super.clear();
   }

   // INDICATE LINKING MODE WITH A DARK BACKGROUND COLOR

   public Color bgColor() {
      bgColorData = iLink >= 0 ? linkBgColor : Color.white;
      return super.bgColor();
   }

   // SHADOW OF A LINK ITEM IS THICKER THAN USUAL

   public void renderShadow() {
      if (iLink >= 0) {
         if (iSelected >= 0) {
            setShadow(iSelected);
            int r = item2(iSelected).r + (item7(iSelected).thicken ? 2 : 0);
            item7(iSelected).draw(g, 10, 10, iSelected==iLink ? 5*r/2 : r);
         }
      }
      else
         super.renderShadow();
   }

   // BEFORE RENDERING BACKGROUND: HIGHLIGHT THE LINK ITEM, IF ANY,
   // AND LET EACH ITEM KNOW WHETHER THE APP. IS IN LINKING MODE

   public void renderBg() {
      for (int i = 0 ; i < nItems ; i++) {
         item7(i).setHighlighted(i == iLink);
         item7(i).setLinkingMode(iLink >= 0);
      }
      super.renderBg();
   }

   // RIGHT-DRAG AN ITEM TO START OR CONTINUE USING IT AS THE LINK ITEM
   // RIGHT-CLICK TO TOGGLE LINK MODE

   int mdx = 0, mdy = 0;

   public boolean mouseDown(Event e, int x, int y) {
      isClick = true;
      isRight = isRightButton(e);
      mdx = x;
      mdy = y;
      return super.mouseDown(e, x, y);
   }

   public boolean mouseDrag(Event e, int x, int y) {
      isClick = false;
      return super.mouseDrag(e, x, y);
   }

   // IN LINK MODE, CHANGES TO OTHER ITEMS ARE RECORDED WITHIN THE LINK ITEM.

   public boolean mouseUp(Event e, int x, int y) {
      damage = true;

      if (iLink >= 0) {
         if (isClick && iLink == iSelected)
            setLinkItem(-1);

         else if (isRight && iLink == iSelected)
            item7(iLink).setKey(++linkKey);

         else if (isRight && isClick)
            setLinkItem(iSelected);

         else if (iLink == iSelected)
            item7(iLink).setKey(++linkKey);

         else if (isRight && iSelected >= 0)
            startLinkDrag(x, y);

         else if (iSelected >= 0)
            item7(iLink).linkAtKey(linkKey, item7(iSelected));

         else
            super.mouseUp(e, x, y);
      }

      else if (isRight && isClick) {
         setLinkItem(iSelected);
      }

      else if (isRight && iSelected >= 0) {
         startLinkDrag(x, y);
      }
      else
         super.mouseUp(e, x, y);

      isRight = false;
      iSelected = -1;
      return true;
   }

   void startLinkDrag(int x, int y) {
      Item7 it = item7(iSelected);
      it.x0 += mdx - x;
      it.y0 += mdy - y;
      setLinkItem(iSelected);
      it.x0 -= mdx - x;
      it.y0 -= mdy - y;
      it.setKey(++linkKey);
   }

   public void setColor(int i) {
      super.setColor(i);
      if (iLink >= 0)
         item7(iLink).linkAtKey(linkKey, item7(i));
   }

   // START A NEW LINK SEQUENCE, AND SET THE LINK ITEM'S LINK-KEY TO 0.

   void setLinkItem(int i) {
      iLink = i;
      if (iLink >= 0)
         item7(iLink).setKey(linkKey = 0);
   }

   // IF USER DELETES THE LINK ITEM, MAKE SURE TO SET ILINK TO UNDEFINED (-1)

   public void deleteItem(int i) {
      if (i == iLink)
         iLink = -1;
      super.deleteItem(i);
   }
}