source: trunk/src/org/expeditee/gui/Help.java@ 684

package org.expeditee.gui;

import org.expeditee.items.Item;
import org.expeditee.items.Line;
import org.expeditee.items.Text;
import org.expeditee.settings.experimental.ExperimentalFeatures;


public class Help {
        
        // contexts
        private static final int background = 0, item = 1, line = 2, text = 3;
        
        // mouse buttons
        private static final int left = 1, middle = 2, right = 4;
        private static final String[] buttons = { "", "L", "M", "LM", "R", "LR", "MR" };
        
        // modifiers
        private static final int control = 1, shift = 2;
        private static final String[] modifiers = { "", "^", "+", "^+" };
        
        // other
        private static final int panning = 1, action = 2, cursor = 4;
        
        // separator between command and description
        private static final String separatorString = ": ";
        // flag for dragging
        private static final String dragString = "d";
        
        private static final String commandPadding = "     ";
        private static final String padding = "                  ";
        
        private static final String command(int mod, int button, boolean drag) {
                String cmd = (drag ? dragString : "") + modifiers[mod] + buttons[button];
                return commandPadding.substring(cmd.length()) + cmd + separatorString;
        }
        
        private static final String command(int mod, int button) {
                return command(mod, button, false);
        }
        
        private static final String left(int context, int mod, int other) {
                switch(context) {
                case background:
                if((mod & (control | shift)) != 0) return "Go forward";
                return "Go back";
                default:
                        if((other & action) != 0 && (mod & control) == 0) return "Run action";
                        return "Follow link";
                }
        }
        
        private static final String middle(int context, int mod, int other) {
                switch(context) {
                case background:
                if((other & cursor) != 0) return "Place item(s)";
                return "Create arrow";
                case line:
                        if((mod & shift) != 0) return "Extend shape";
                case text:
                        if((other & cursor) != 0 && FrameUtils.getCurrentItem() instanceof Text) return "Merge text";
                default:
                        if((other & cursor) != 0) return "Place item(s)";
                if((mod & shift) != 0) return "Create arrow";
                        return "Pickup";
                }
        }
        
        private static final String right(int context, int mod, int other) {
                switch(context) {
                case background:
                        if((other & cursor) != 0) return "Stamp item(s)";
                        return "Create rectangle";
                case line:
                        if((mod & shift) != 0) return "Add line";
                default:
                        if((other & cursor) != 0) return "Stamp item(s)";
                        if((mod & shift) != 0) return "Create rectangle";
                        return "Copy";
                }
        }
        
        private static final String left_middle(int context, int mod, int other) {
                return null;
        }
        
        private static final String left_right(int context, int mod, int other) {
                switch(context) {
                default:
                        if((other & cursor) == 0) return "Extract attributes";
                case background:
                        return "Auto format";
                }
        }
        
        private static final String middle_right(int context, int mod, int other) {
                switch(context) {
                case text:
                        if((other & cursor) != 0 && FrameUtils.getCurrentItem() instanceof Text) return "Swap text";
                case background:
                        if((other & cursor) == 0) return "Undo";
                default:
                        return "Delete";
                }
        }
        
        private static final String drag_left(int context, int mod, int other) {
                switch(context) {
                case background:
                if((mod & shift) != 0 && (other & cursor) == 0) return "Drag to pan";
                case text:
                        if((other & cursor) == 0) return "Select region";
                }
                return null;
        }
        
        private static final String drag_middle(int context, int mod, int other) {
                switch(context) {
                case text:
                        if((other & cursor) == 0) return "Cut region";
                }
                return null;
        }
        
        private static final String drag_right(int context, int mod, int other) {
                switch(context) {
                case line:
                        return "Extrude shape";
                case text:
                        if((other & cursor) == 0) return "Copy region";
                }
                return null;
        }
        
        
        public static void updateStatus() {
                Item current = FrameUtils.getCurrentItem();
                int context;
                if(current != null) {
                        if(current instanceof Line) {
                                context = line;
                        } else if(current instanceof Text) {
                                context = text;
                        } else {
                                context = item;
                        }
                } else if(FrameUtils.getCurrentItems() != null) {
                        context = item;
                } else {
                        context = background;
                }
                int mod = (FrameMouseActions.isControlDown() ? control : 0) | (FrameMouseActions.isShiftDown() ? shift : 0);
                int other = (ExperimentalFeatures.MousePan.get() ? panning : 0) | (current != null && current.hasAction() ? action : 0) | (FreeItems.itemsAttachedToCursor() ? cursor : 0);
                String status = "";
                
                String l =  left(context, mod, other);
                String m =  middle(context, mod, other);
                String r =  right(context, mod, other);
                String lr = left_right(context, mod, other);
                String lm = left_middle(context, mod, other);
                String mr = middle_right(context, mod, other);
                String dl = drag_left(context, mod, other);
                String dm = drag_middle(context, mod, other);
                String dr = drag_right(context, mod, other);
                
                if(l != null)  status += command(mod, left) + l + padding.substring(l.length());
                if(m != null)  status += command(mod, middle) + m + padding.substring(m.length());
                if(r != null)  status += command(mod, right) + r + padding.substring(r.length());
                if(lm != null) status += command(mod, left | middle) + lm + padding.substring(lm.length());
                if(lr != null) status += command(mod, left | right) + lr + padding.substring(lr.length());
                if(mr != null) status += command(mod, middle | right) + mr + padding.substring(mr.length());
                if(dl != null || dm != null || dr != null) status += "\n";
                if(dl != null) status += command(mod, left, true) + dl + padding.substring(dl.length());
                if(dm != null) status += command(mod, middle, true) + dm + padding.substring(dm.length());
                if(dr != null) status += command(mod, right, true) + dr + padding.substring(dr.length());
                
                MessageBay.setStatus(status);
        }

}