doorgo/testdoor/mainmenu.go

package main

import (
	"bytes"
	"red-green/door"
	"strings"

	"github.com/mitchellh/go-wordwrap"
)

// Build door.Menu (Main menu)
func MainMenu() door.Menu {
	// Make the main menu
	// Width was 45
	var menu door.Menu = door.Menu{Panel: door.Panel{Width: 35,
		X:           2,
		Y:           2,
		Style:       door.DOUBLE,
		Title:       "[ Main Menu: ]",
		TitleOffset: 3,
		BorderColor: door.ColorText("BRI CYAN ON BLA")}}
	menu.SelectedR = door.MakeMenuRender(door.ColorText("BOLD CYAN"),
		door.ColorText("BOLD BLUE"),
		door.ColorText("BOLD WHITE"),
		door.ColorText("BOLD CYAN"))
	menu.UnselectedR = door.MakeMenuRender(door.ColorText("BOLD YEL ON BLUE"),
		door.ColorText("BOLD WHI ON BLUE"),
		door.ColorText("BOLD YEL ON BLUE"),
		door.ColorText("BOLD CYAN ON BLUE"))

	menu.AddSelection("A", "ANSI Display")
	// m.AddSelection("C", "Crash")
	menu.AddSelection("D", "Display Information")
	menu.AddSelection("F", "Font Demo")
	menu.AddSelection("I", "Input Demo")
	menu.AddSelection("M", "Menu Demo")
	menu.AddSelection("P", "Progress Bars Demo")
	menu.AddSelection("S", "Show Panel")
	menu.AddSelection("T", "Test Door About")
	menu.AddSelection("W", "Screen Width")
	menu.AddSelection("Q", "Quit")

	var descriptions []string = []string{
		// 12345678901234567890123456789012345678901234567890
		"Display an ANSI file. It is compiled into the door itself.",
		// "Crash go, see a handled error.",  // The error shows up in the logs.
		"Display dropfile information.",
		"Display TheDraw Fonts. Font information is compiled into the door.",
		"Input some values, while updating the time.",
		"Isn't this is a menu?",
		"Display progress bar styles: half step, display percentage, and gradient.",
		"Show multiple panels. Panels can be mouse drag/drop around.",
		"Show about the door, using NoMoreSecrets effect.",
		"Examples using the full width of the screen.",
		"Exit this door.",
	}

	var widthLeft int = door.Width - (menu.Width + menu.X + 2)
	var panelWidth int = widthLeft - (2 + 2)
	var maxLines int = 1
	var maxLineLength int
	// Calculate the max lines needed for each line.
	for _, line := range descriptions {
		var wrapped string = wordwrap.WrapString(line, uint(panelWidth))
		var lines int = len(strings.Split(wrapped, "\n"))
		if lines > maxLines {
			maxLines = lines
		}
		if len(line) > maxLineLength {
			maxLineLength = len(line)
		}
	}

	if maxLines == 1 {
		// Ok! Everything fits into one line, SO use max line length as width of panel.
		panelWidth = maxLineLength
	}
	// Position the description panel beside the menu. m.Width + m.X + 2 (1 one to give it a space)
	// var descPanel door.Panel = door.Panel{X: menu.Width + menu.X + 2 + 1, Y: menu.Y, Width: panelWidth, Style: door.SINGLE, BorderColor: door.ColorText("WHI ON BLU")}

	var descPanel door.Panel = door.Panel{X: 2, Y: menu.Y + len(menu.Lines) + 3, Width: panelWidth, Style: door.SINGLE, BorderColor: door.ColorText("WHI ON BLU")}
	for x := 0; x < maxLines; x++ {
		descPanel.Lines = append(descPanel.Lines, &door.Line{Width: panelWidth})
	}

	menu.Activated = func(item int, d *door.Door) {
		var line string = descriptions[item]
		var lines []string = strings.Split(wordwrap.WrapString(line, uint(panelWidth)), "\n")
		for idx := range descPanel.Lines {
			if idx >= len(lines) {
				descPanel.Lines[idx].Text = &bytes.Buffer{}
			} else {
				descPanel.Lines[idx].Text = bytes.NewBuffer([]byte(lines[idx]))
			}
		}
		d.WriteA(door.SavePos, descPanel.Output(), door.RestorePos)
	}
	return menu
}