ref: 1c6acfa38b9e601daaebbc25c1ae4997f7d22b39
dir: /browser/grid.go/
package browser
// 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 (
"fmt"
"image"
"9fans.net/go/draw"
"github.com/mjl-/duit"
)
// Grid lays out other duit.UIs in a table-like grid.
type Grid struct {
Kids []*duit.Kid // Holds UIs in the grid, per row.
Columns int // Number of clumns.
Valign []duit.Valign // Vertical alignment per column.
Halign []duit.Halign // Horizontal alignment per column.
Padding []duit.Space // Padding in lowDPI pixels per column.
Width int // -1 means full width, 0 means automatic width, >0 means exactly that many lowDPI pixels.
Background *draw.Image `json:"-"` // Background color.
widths []int
heights []int
size image.Point
}
var _ duit.UI = &Grid{}
func (ui *Grid) Layout(dui *duit.DUI, self *duit.Kid, sizeAvail image.Point, force bool) {
debugLayout(dui, self)
if duit.KidsLayout(dui, self, ui.Kids, force) {
return
}
if ui.Valign != nil && len(ui.Valign) != ui.Columns {
panic(fmt.Sprintf("len(valign) = %d, should be ui.Columns = %d", len(ui.Valign), ui.Columns))
}
if ui.Halign != nil && len(ui.Halign) != ui.Columns {
panic(fmt.Sprintf("len(halign) = %d, should be ui.Columns = %d", len(ui.Halign), ui.Columns))
}
if ui.Padding != nil && len(ui.Padding) != ui.Columns {
panic(fmt.Sprintf("len(padding) = %d, should be ui.Columns = %d", len(ui.Padding), ui.Columns))
}
if len(ui.Kids)%ui.Columns != 0 {
panic(fmt.Sprintf("len(kids) = %d, should be multiple of ui.Columns = %d", len(ui.Kids), ui.Columns))
}
scaledWidth := dui.Scale(ui.Width)
if scaledWidth > 0 && scaledWidth < sizeAvail.X {
ui.size.X = scaledWidth
}
ui.widths = make([]int, ui.Columns) // widths include padding
spaces := make([]duit.Space, ui.Columns)
if ui.Padding != nil {
for i, pad := range ui.Padding {
spaces[i] = dui.ScaleSpace(pad)
}
}
width := 0 // total width so far
x := make([]int, len(ui.widths)) // x offsets per column
x[0] = 0
// first determine the column widths
for col := 0; col < ui.Columns; col++ {
if col > 0 {
x[col] = x[col-1] + ui.widths[col-1]
}
ui.widths[col] = 0
newDx := 0
space := spaces[col]
for i := col; i < len(ui.Kids); i += ui.Columns {
k := ui.Kids[i]
k.UI.Layout(dui, k, image.Pt(sizeAvail.X-width-space.Dx(), sizeAvail.Y-space.Dy()), true)
newDx = maximum(newDx, k.R.Dx()+space.Dx())
}
ui.widths[col] = newDx
width += ui.widths[col]
}
if scaledWidth < 0 && width < sizeAvail.X {
leftover := sizeAvail.X - width
given := 0
for i := range ui.widths {
x[i] += given
var dx int
if i == len(ui.widths)-1 {
dx = leftover - given
} else {
dx = leftover / len(ui.widths)
}
ui.widths[i] += dx
given += dx
}
}
// now determine row heights
ui.heights = make([]int, (len(ui.Kids)+ui.Columns-1)/ui.Columns)
height := 0 // total height so far
y := make([]int, len(ui.heights)) // including padding
y[0] = 0
for i := 0; i < len(ui.Kids); i += ui.Columns {
row := i / ui.Columns
if row > 0 {
y[row] = y[row-1] + ui.heights[row-1]
}
rowDy := 0
for col := 0; col < ui.Columns; col++ {
space := spaces[col]
k := ui.Kids[i+col]
k.UI.Layout(dui, k, image.Pt(ui.widths[col]-space.Dx(), sizeAvail.Y-y[row]-space.Dy()), true)
offset := image.Pt(x[col], y[row]).Add(space.Topleft())
k.R = k.R.Add(offset) // aligned in top left, fixed for halign/valign later on
rowDy = maximum(rowDy, k.R.Dy()+space.Dy())
}
ui.heights[row] = rowDy
height += ui.heights[row]
}
// now shift the kids for right valign/halign
for i, k := range ui.Kids {
row := i / ui.Columns
col := i % ui.Columns
space := spaces[col]
valign := duit.ValignTop
halign := duit.HalignLeft
if ui.Valign != nil {
valign = ui.Valign[col]
}
if ui.Halign != nil {
halign = ui.Halign[col]
}
cellSize := image.Pt(ui.widths[col], ui.heights[row]).Sub(space.Size())
spaceX := 0
switch halign {
case duit.HalignLeft:
case duit.HalignMiddle:
spaceX = (cellSize.X - k.R.Dx()) / 2
case duit.HalignRight:
spaceX = cellSize.X - k.R.Dx()
}
spaceY := 0
switch valign {
case duit.ValignTop:
case duit.ValignMiddle:
spaceY = (cellSize.Y - k.R.Dy()) / 2
case duit.ValignBottom:
spaceY = cellSize.Y - k.R.Dy()
}
k.R = k.R.Add(image.Pt(spaceX, spaceY))
}
ui.size = image.Pt(width, height)
if ui.Width < 0 && ui.size.X < sizeAvail.X {
ui.size.X = sizeAvail.X
}
self.R = rect(ui.size)
}
func (ui *Grid) Draw(dui *duit.DUI, self *duit.Kid, img *draw.Image, orig image.Point, m draw.Mouse, force bool) {
duit.KidsDraw(dui, self, ui.Kids, ui.size, ui.Background, img, orig, m, force)
}
func (ui *Grid) Mouse(dui *duit.DUI, self *duit.Kid, m draw.Mouse, origM draw.Mouse, orig image.Point) (r duit.Result) {
return duit.KidsMouse(dui, self, ui.Kids, m, origM, orig)
}
func (ui *Grid) Key(dui *duit.DUI, self *duit.Kid, k rune, m draw.Mouse, orig image.Point) (r duit.Result) {
return duit.KidsKey(dui, self, ui.Kids, k, m, orig)
}
func (ui *Grid) FirstFocus(dui *duit.DUI, self *duit.Kid) *image.Point {
return duit.KidsFirstFocus(dui, self, ui.Kids)
}
func (ui *Grid) Focus(dui *duit.DUI, self *duit.Kid, o duit.UI) *image.Point {
return duit.KidsFocus(dui, self, ui.Kids, o)
}
func (ui *Grid) Mark(self *duit.Kid, o duit.UI, forLayout bool) (marked bool) {
return duit.KidsMark(self, ui.Kids, o, forLayout)
}
func (ui *Grid) Print(self *duit.Kid, indent int) {
duit.PrintUI(fmt.Sprintf("Grid columns=%d padding=%v", ui.Columns, ui.Padding), self, indent)
duit.KidsPrint(ui.Kids, indent+1)
}