enigma-bbs/core/horizontal_menu_view.js

148 lines
3.7 KiB
JavaScript
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/* jslint node: true */
'use strict';
var MenuView = require('./menu_view.js').MenuView;
var ansi = require('./ansi_term.js');
var strUtil = require('./string_util.js');
var assert = require('assert');
var _ = require('lodash');
exports.HorizontalMenuView = HorizontalMenuView;
// :TODO: Update this to allow scrolling if number of items cannot fit in width (similar to VerticalMenuView)
function HorizontalMenuView(options) {
options.cursor = options.cursor || 'hide';
if(!_.isNumber(options.itemSpacing)) {
options.itemSpacing = 1;
}
MenuView.call(this, options);
this.dimens.height = 1; // always the case
var self = this;
this.getSpacer = function() {
return new Array(self.itemSpacing + 1).join(' ');
};
this.performAutoScale = function() {
if(self.autoScale.width) {
var spacer = self.getSpacer();
var width = self.items.join(spacer).length + (spacer.length * 2);
assert(width <= self.client.term.termWidth - self.position.col);
self.dimens.width = width;
}
};
this.performAutoScale();
this.cachePositions = function() {
if(this.positionCacheExpired) {
var col = self.position.col;
var spacer = self.getSpacer();
for(var i = 0; i < self.items.length; ++i) {
self.items[i].col = col;
col += spacer.length + self.items[i].text.length + spacer.length;
}
}
this.positionCacheExpired = false;
};
this.drawItem = function(index) {
assert(!this.positionCacheExpired);
var item = self.items[index];
if(!item) {
return;
}
var text = strUtil.stylizeString(
item.text,
this.hasFocus && item.focused ? self.focusTextStyle : self.textStyle);
var drawWidth = text.length + self.getSpacer().length * 2; // * 2 = sides
self.client.term.write(
ansi.goto(self.position.row, item.col) +
(index === self.focusedItemIndex ? self.getFocusSGR() : self.getSGR()) +
strUtil.pad(text, drawWidth, self.fillChar, 'center')
);
};
}
require('util').inherits(HorizontalMenuView, MenuView);
HorizontalMenuView.prototype.setHeight = function(height) {
height = parseInt(height, 10);
assert(1 === height); // nothing else allowed here
HorizontalMenuView.super_.prototype.setHeight(this, height);
};
HorizontalMenuView.prototype.redraw = function() {
HorizontalMenuView.super_.prototype.redraw.call(this);
this.cachePositions();
for(var i = 0; i < this.items.length; ++i) {
this.items[i].focused = this.focusedItemIndex === i;
this.drawItem(i);
}
};
HorizontalMenuView.prototype.setPosition = function(pos) {
HorizontalMenuView.super_.prototype.setPosition.call(this, pos);
this.positionCacheExpired = true;
};
HorizontalMenuView.prototype.setFocus = function(focused) {
HorizontalMenuView.super_.prototype.setFocus.call(this, focused);
this.redraw();
};
HorizontalMenuView.prototype.setItems = function(items) {
HorizontalMenuView.super_.prototype.setItems.call(this, items);
this.positionCacheExpired = true;
};
HorizontalMenuView.prototype.onKeyPress = function(ch, key) {
if(key) {
var prevFocusedItemIndex = this.focusedItemIndex;
if(this.isKeyMapped('left', key.name)) {
if(0 === this.focusedItemIndex) {
this.focusedItemIndex = this.items.length - 1;
} else {
this.focusedItemIndex--;
}
} else if(this.isKeyMapped('right', key.name)) {
if(this.items.length - 1 === this.focusedItemIndex) {
this.focusedItemIndex = 0;
} else {
this.focusedItemIndex++;
}
}
if(prevFocusedItemIndex !== this.focusedItemIndex) {
// :TODO: Optimize this in cases where we only need to redraw two items. Always the case now, somtimes
// if this is changed to allow scrolling
this.redraw();
return;
}
}
HorizontalMenuView.super_.prototype.onKeyPress.call(this, ch, key);
};
HorizontalMenuView.prototype.getData = function() {
return this.focusedItemIndex;
};