enigma-bbs/core/vertical_menu_view.js

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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 miscUtil = require('./misc_util.js');
var util = require('util');
var assert = require('assert');
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var _ = require('lodash');
exports.VerticalMenuView = VerticalMenuView;
function VerticalMenuView(options) {
options.cursor = options.cursor || 'hide';
options.justify = options.justify || 'right'; // :TODO: default to center
MenuView.call(this, options);
var self = this;
this.performAutoScale = function() {
if(this.autoScale.height) {
this.dimens.height = (self.items.length * (self.itemSpacing + 1)) - (self.itemSpacing);
this.dimens.height = Math.min(self.dimens.height, self.client.term.termHeight - self.position.row);
}
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if(this.autoScale.width) {
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var l = 0;
self.items.forEach(function item(i) {
if(i.text.length > l) {
l = Math.min(i.text.length, self.client.term.termWidth - self.position.col);
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}
});
self.dimens.width = l + 1;
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}
};
this.performAutoScale();
this.updateViewVisibleItems = function() {
self.maxVisibleItems = Math.ceil(self.dimens.height / (self.itemSpacing + 1));
self.viewWindow = {
top : self.focusedItemIndex,
bottom : Math.min(self.focusedItemIndex + self.maxVisibleItems, self.items.length) - 1
};
};
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this.drawItem = function(index) {
var item = self.items[index];
if(!item) {
return;
}
var text = strUtil.stylizeString(item.text, item.focused ? self.focusTextStyle : self.textStyle);
self.client.term.write(
ansi.goto(item.row, self.position.col) +
(index === self.focusedItemIndex ? self.getFocusSGR() : self.getSGR()) +
strUtil.pad(text, this.dimens.width, this.fillChar, this.justify)
);
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};
}
util.inherits(VerticalMenuView, MenuView);
VerticalMenuView.prototype.redraw = function() {
VerticalMenuView.super_.prototype.redraw.call(this);
// :TODO: rename positionCacheExpired to something that makese sense; combine methods for such
if(this.positionCacheExpired) {
this.performAutoScale();
this.updateViewVisibleItems();
this.positionCacheExpired = false;
}
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var row = this.position.row;
for(var i = this.viewWindow.top; i <= this.viewWindow.bottom; ++i) {
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this.items[i].row = row;
row += this.itemSpacing + 1;
this.items[i].focused = this.focusedItemIndex === i;
this.drawItem(i);
}
};
VerticalMenuView.prototype.setHeight = function(height) {
VerticalMenuView.super_.prototype.setHeight.call(this, height);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setPosition = function(pos) {
VerticalMenuView.super_.prototype.setPosition.call(this, pos);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setFocus = function(focused) {
VerticalMenuView.super_.prototype.setFocus.call(this, focused);
this.redraw();
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};
VerticalMenuView.prototype.onKeyPress = function(ch, key) {
if(key) {
var prevFocusedItemIndex = this.focusedItemIndex;
if(this.isKeyMapped('up', key.name)) {
if(0 === this.focusedItemIndex) {
this.focusedItemIndex = this.items.length - 1;
this.viewWindow = {
top : this.items.length - this.maxVisibleItems,
bottom : this.items.length - 1
};
} else {
this.focusedItemIndex--;
if(this.focusedItemIndex < this.viewWindow.top) {
this.viewWindow.top--;
this.viewWindow.bottom--;
}
}
} else if(this.isKeyMapped('down', key.name)) {
if(this.items.length - 1 === this.focusedItemIndex) {
this.focusedItemIndex = 0;
this.viewWindow = {
top : 0,
bottom : Math.min(this.focusedItemIndex + this.maxVisibleItems, this.items.length) - 1
};
} else {
this.focusedItemIndex++;
if(this.focusedItemIndex > this.viewWindow.bottom) {
this.viewWindow.top++;
this.viewWindow.bottom++;
}
}
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}
if(prevFocusedItemIndex !== this.focusedItemIndex) {
// :TODO: Optimize this for cases where no scrolling occured & only two items need updated
this.redraw();
}
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}
VerticalMenuView.super_.prototype.onKeyPress.call(this, ch, key);
};
VerticalMenuView.prototype.getData = function() {
return this.focusedItemIndex;
};
VerticalMenuView.prototype.setItems = function(items) {
VerticalMenuView.super_.prototype.setItems.call(this, items);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setItemSpacing = function(itemSpacing) {
VerticalMenuView.super_.prototype.setItemSpacing.call(this, itemSpacing);
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this.positionCacheExpired = true;
};