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|
// 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 gocui
import (
"bytes"
"io"
"strings"
"sync"
"time"
"github.com/go-errors/errors"
"github.com/jesseduffield/termbox-go"
"github.com/mattn/go-runewidth"
)
// Constants for overlapping edges
const (
TOP = 1 // view is overlapping at top edge
BOTTOM = 2 // view is overlapping at bottom edge
LEFT = 4 // view is overlapping at left edge
RIGHT = 8 // view is overlapping at right edge
)
// A View is a window. It maintains its own internal buffer and cursor
// position.
type View struct {
name string
x0, y0, x1, y1 int
ox, oy int
cx, cy int
lines [][]cell
readOffset int
readCache string
tainted bool // marks if the viewBuffer must be updated
viewLines []viewLine // internal representation of the view's buffer
ei *escapeInterpreter // used to decode ESC sequences on Write
// BgColor and FgColor allow to configure the background and foreground
// colors of the View.
BgColor, FgColor Attribute
// SelBgColor and SelFgColor are used to configure the background and
// foreground colors of the selected line, when it is highlighted.
SelBgColor, SelFgColor Attribute
// If Editable is true, keystrokes will be added to the view's internal
// buffer at the cursor position.
Editable bool
// Editor allows to define the editor that manages the edition mode,
// including keybindings or cursor behaviour. DefaultEditor is used by
// default.
Editor Editor
// Overwrite enables or disables the overwrite mode of the view.
Overwrite bool
// If Highlight is true, Sel{Bg,Fg}Colors will be used
// for the line under the cursor position.
Highlight bool
// If Frame is true, a border will be drawn around the view.
Frame bool
// If Wrap is true, the content that is written to this View is
// automatically wrapped when it is longer than its width. If true the
// view's x-origin will be ignored.
Wrap bool
// If Autoscroll is true, the View will automatically scroll down when the
// text overflows. If true the view's y-origin will be ignored.
Autoscroll bool
// If Frame is true, Title allows to configure a title for the view.
Title string
Tabs []string
TabIndex int
// If Frame is true, Subtitle allows to configure a subtitle for the view.
Subtitle string
// If Mask is true, the View will display the mask instead of the real
// content
Mask rune
// Overlaps describes which edges are overlapping with another view's edges
Overlaps byte
// If HasLoader is true, the message will be appended with a spinning loader animation
HasLoader bool
writeMutex sync.Mutex
// IgnoreCarriageReturns tells us whether to ignore '\r' characters
IgnoreCarriageReturns bool
// ParentView is the view which catches events bubbled up from the given view if there's no matching handler
ParentView *View
}
type viewLine struct {
linesX, linesY int // coordinates relative to v.lines
line []cell
}
type cell struct {
chr rune
bgColor, fgColor Attribute
}
type lineType []cell
// String returns a string from a given cell slice.
func (l lineType) String() string {
str := ""
for _, c := range l {
str += string(c.chr)
}
return str
}
// newView returns a new View object.
func newView(name string, x0, y0, x1, y1 int, mode OutputMode) *View {
v := &View{
name: name,
x0: x0,
y0: y0,
x1: x1,
y1: y1,
Frame: true,
Editor: DefaultEditor,
tainted: true,
ei: newEscapeInterpreter(mode),
}
return v
}
// Dimensions returns the dimensions of the View
func (v *View) Dimensions() (int, int, int, int) {
return v.x0, v.y0, v.x1, v.y1
}
// Size returns the number of visible columns and rows in the View.
func (v *View) Size() (x, y int) {
return v.x1 - v.x0 - 1, v.y1 - v.y0 - 1
}
// Name returns the name of the view.
func (v *View) Name() string {
return v.name
}
// setRune sets a rune at the given point relative to the view. It applies the
// specified colors, taking into account if the cell must be highlighted. Also,
// it checks if the position is valid.
func (v *View) setRune(x, y int, ch rune, fgColor, bgColor Attribute) error {
maxX, maxY := v.Size()
if x < 0 || x >= maxX || y < 0 || y >= maxY {
return errors.New("invalid point")
}
var (
ry, rcy int
err error
)
if v.Highlight {
_, ry, err = v.realPosition(x, y)
if err != nil {
return err
}
_, rcy, err = v.realPosition(v.cx, v.cy)
if err != nil {
return err
}
}
if v.Mask != 0 {
fgColor = v.FgColor
bgColor = v.BgColor
ch = v.Mask
} else if v.Highlight && ry == rcy {
fgColor = fgColor | AttrBold
}
termbox.SetCell(v.x0+x+1, v.y0+y+1, ch,
termbox.Attribute(fgColor), termbox.Attribute(bgColor))
return nil
}
// SetCursor sets the cursor position of the view at the given point,
// relative to the view. It checks if the position is valid.
func (v *View) SetCursor(x, y int) error {
maxX, maxY := v.Size()
if x < 0 || x >= maxX || y < 0 || y >= maxY
|