ref: a4ab438c7fa9478d4efd8128482cbddee9130ce1
dir: /browser/duitx/label.go/
package duitx
// Original code from github.com/mjl-/duit
//
// Copyright 2018 Mechiel Lukkien mechiel@ueber.net
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import (
"image"
"math"
"9fans.net/go/draw"
"github.com/mjl-/duit"
)
// Label draws multiline text in a single font.:
//
// Keys:
// cmd-c, copy text
// \n, like button1 click, calls the Click function
type Label struct {
Text string // Text to draw, wrapped at glyph boundary.
Font *draw.Font `json:"-"` // For drawing text.
Click func() (e duit.Event) `json:"-"` // Called on button1 click.
lines []string
size image.Point
m draw.Mouse
}
var _ duit.UI = &Label{}
func (ui *Label) font(dui *duit.DUI) *draw.Font {
return dui.Font(ui.Font)
}
func (ui *Label) Layout(dui *duit.DUI, self *duit.Kid, sizeAvail image.Point, force bool) {
debugLayout(dui, self)
font := ui.font(dui)
ui.lines = []string{}
s := 0
x := 0
xmax := 0
for i, c := range ui.Text {
if c == '\n' {
xmax = maximum(xmax, x)
ui.lines = append(ui.lines, ui.Text[s:i])
s = i + 1
x = 0
continue
}
dx := font.StringWidth(string(c))
x += dx
if i-s == 0 || x <= sizeAvail.X {
continue
}
xmax = maximum(xmax, x-dx)
ui.lines = append(ui.lines, ui.Text[s:i])
s = i
x = dx
}
if s < len(ui.Text) || s == 0 {
ui.lines = append(ui.lines, ui.Text[s:])
xmax = maximum(xmax, x)
}
ui.size = image.Pt(xmax, len(ui.lines)*ui.lineHeight(font))
self.R = rect(ui.size)
}
func (ui *Label) lineHeight(font *draw.Font) int {
return int(math.Ceil(float64(font.Height)*1.2))
}
func (ui *Label) Draw(dui *duit.DUI, self *duit.Kid, img *draw.Image, orig image.Point, m draw.Mouse, force bool) {
debugDraw(dui, self)
p := orig
font := ui.font(dui)
for _, line := range ui.lines {
img.String(p, dui.Regular.Normal.Text, image.ZP, font, line)
p.Y += ui.lineHeight(font)
}
}
func (ui *Label) Mouse(dui *duit.DUI, self *duit.Kid, m draw.Mouse, origM draw.Mouse, orig image.Point) (r duit.Result) {
if m.In(rect(ui.size)) && ui.m.Buttons == 0 && m.Buttons == duit.Button1 && ui.Click != nil {
e := ui.Click()
propagateEvent(self, &r, e)
}
ui.m = m
return
}
func (ui *Label) Key(dui *duit.DUI, self *duit.Kid, k rune, m draw.Mouse, orig image.Point) (r duit.Result) {
switch k {
case '\n':
if ui.Click != nil {
e := ui.Click()
propagateEvent(self, &r, e)
}
case draw.KeyCmd + 'c':
dui.WriteSnarf([]byte(ui.Text))
r.Consumed = true
}
return
}
func (ui *Label) FirstFocus(dui *duit.DUI, self *duit.Kid) *image.Point {
return nil
}
func (ui *Label) Focus(dui *duit.DUI, self *duit.Kid, o duit.UI) *image.Point {
if ui != o {
return nil
}
return &image.ZP
}
func (ui *Label) Mark(self *duit.Kid, o duit.UI, forLayout bool) (marked bool) {
return self.Mark(o, forLayout)
}
func (ui *Label) Print(self *duit.Kid, indent int) {
duit.PrintUI("Label", self, indent)
}
func propagateEvent(self *duit.Kid, r *duit.Result, e duit.Event) {
if e.NeedLayout {
self.Layout = duit.Dirty
}
if e.NeedDraw {
self.Draw = duit.Dirty
}
r.Consumed = e.Consumed || r.Consumed
}