gocui/_examples/mouse.go

// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"fmt"
	"log"

	"github.com/jroimartin/gocui"
)

func main() {
	var err error

	g := gocui.NewGui()
	if err := g.Init(); err != nil {
		log.Panicln(err)
	}
	defer g.Close()

	g.SetLayout(layout)
	if err := keybindings(g); err != nil {
		log.Panicln(err)
	}
	g.EnableMouse = true

	err = g.MainLoop()
	if err != nil && err != gocui.ErrQuit {
		log.Panicln(err)
	}
}

func layout(g *gocui.Gui) error {
	if v, err := g.SetView("but1", 2, 2, 12, 4); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		fmt.Fprintln(v, "Button 1")
	}
	if v, err := g.SetView("but2", 14, 2, 24, 4); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		fmt.Fprintln(v, "Button 2")
	}
	return nil
}

func keybindings(g *gocui.Gui) error {
	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		return err
	}
	for _, n := range []string{"but1", "but2"} {
		if err := g.SetKeybinding(n, gocui.MouseLeft, gocui.ModNone, showMsg); err != nil {
			return err
		}
	}
	if err := g.SetKeybinding("msg", gocui.MouseLeft, gocui.ModNone, delMsg); err != nil {
		return err
	}
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

func showMsg(g *gocui.Gui, v *gocui.View) error {
	var l string
	var err error

	_, cy := v.Cursor()
	if l, err = v.Line(cy); err != nil {
		l = ""
	}

	maxX, maxY := g.Size()
	if v, err := g.SetView("msg", maxX/2-5, maxY/2, maxX/2+5, maxY/2+2); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		fmt.Fprintln(v, l)
	}
	return nil
}

func delMsg(g *gocui.Gui, v *gocui.View) error {
	if err := g.DeleteView("msg"); err != nil {
		return err
	}
	return nil
}