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split.go
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split.go
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package container
import (
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/driver/desktop"
"fyne.io/fyne/v2/theme"
"fyne.io/fyne/v2/widget"
)
// Declare conformity with CanvasObject interface
var _ fyne.CanvasObject = (*Split)(nil)
// Split defines a container whose size is split between two children.
//
// Since: 1.4
type Split struct {
widget.BaseWidget
Offset float64
Horizontal bool
Leading fyne.CanvasObject
Trailing fyne.CanvasObject
}
// NewHSplit creates a horizontally arranged container with the specified leading and trailing elements.
// A vertical split bar that can be dragged will be added between the elements.
//
// Since: 1.4
func NewHSplit(leading, trailing fyne.CanvasObject) *Split {
return newSplitContainer(true, leading, trailing)
}
// NewVSplit creates a vertically arranged container with the specified top and bottom elements.
// A horizontal split bar that can be dragged will be added between the elements.
//
// Since: 1.4
func NewVSplit(top, bottom fyne.CanvasObject) *Split {
return newSplitContainer(false, top, bottom)
}
func newSplitContainer(horizontal bool, leading, trailing fyne.CanvasObject) *Split {
s := &Split{
Offset: 0.5, // Sensible default, can be overridden with SetOffset
Horizontal: horizontal,
Leading: leading,
Trailing: trailing,
}
s.BaseWidget.ExtendBaseWidget(s)
return s
}
// CreateRenderer is a private method to Fyne which links this widget to its renderer
func (s *Split) CreateRenderer() fyne.WidgetRenderer {
s.BaseWidget.ExtendBaseWidget(s)
d := newDivider(s)
return &splitContainerRenderer{
split: s,
divider: d,
objects: []fyne.CanvasObject{s.Leading, d, s.Trailing},
}
}
// ExtendBaseWidget is used by an extending widget to make use of BaseWidget functionality.
//
// Deprecated: Support for extending containers is being removed
func (s *Split) ExtendBaseWidget(wid fyne.Widget) {
s.BaseWidget.ExtendBaseWidget(wid)
}
// SetOffset sets the offset (0.0 to 1.0) of the Split divider.
// 0.0 - Leading is min size, Trailing uses all remaining space.
// 0.5 - Leading & Trailing equally share the available space.
// 1.0 - Trailing is min size, Leading uses all remaining space.
func (s *Split) SetOffset(offset float64) {
if s.Offset == offset {
return
}
s.Offset = offset
s.Refresh()
}
var _ fyne.WidgetRenderer = (*splitContainerRenderer)(nil)
type splitContainerRenderer struct {
split *Split
divider *divider
objects []fyne.CanvasObject
}
func (r *splitContainerRenderer) Destroy() {
}
func (r *splitContainerRenderer) Layout(size fyne.Size) {
var dividerPos, leadingPos, trailingPos fyne.Position
var dividerSize, leadingSize, trailingSize fyne.Size
if r.split.Horizontal {
lw, tw := r.computeSplitLengths(size.Width, r.minLeadingWidth(), r.minTrailingWidth())
leadingPos.X = 0
leadingSize.Width = lw
leadingSize.Height = size.Height
dividerPos.X = lw
dividerSize.Width = dividerThickness()
dividerSize.Height = size.Height
trailingPos.X = lw + dividerSize.Width
trailingSize.Width = tw
trailingSize.Height = size.Height
} else {
lh, th := r.computeSplitLengths(size.Height, r.minLeadingHeight(), r.minTrailingHeight())
leadingPos.Y = 0
leadingSize.Width = size.Width
leadingSize.Height = lh
dividerPos.Y = lh
dividerSize.Width = size.Width
dividerSize.Height = dividerThickness()
trailingPos.Y = lh + dividerSize.Height
trailingSize.Width = size.Width
trailingSize.Height = th
}
r.divider.Move(dividerPos)
r.divider.Resize(dividerSize)
r.split.Leading.Move(leadingPos)
r.split.Leading.Resize(leadingSize)
r.split.Trailing.Move(trailingPos)
r.split.Trailing.Resize(trailingSize)
canvas.Refresh(r.divider)
}
func (r *splitContainerRenderer) MinSize() fyne.Size {
s := fyne.NewSize(0, 0)
for _, o := range r.objects {
min := o.MinSize()
if r.split.Horizontal {
s.Width += min.Width
s.Height = fyne.Max(s.Height, min.Height)
} else {
s.Width = fyne.Max(s.Width, min.Width)
s.Height += min.Height
}
}
return s
}
func (r *splitContainerRenderer) Objects() []fyne.CanvasObject {
return r.objects
}
func (r *splitContainerRenderer) Refresh() {
r.objects[0] = r.split.Leading
// [1] is divider which doesn't change
r.objects[2] = r.split.Trailing
r.Layout(r.split.Size())
canvas.Refresh(r.split)
}
func (r *splitContainerRenderer) computeSplitLengths(total, lMin, tMin float32) (float32, float32) {
available := float64(total - dividerThickness())
if available <= 0 {
return 0, 0
}
ld := float64(lMin)
tr := float64(tMin)
offset := r.split.Offset
min := ld / available
max := 1 - tr/available
if min <= max {
if offset < min {
offset = min
}
if offset > max {
offset = max
}
} else {
offset = ld / (ld + tr)
}
ld = offset * available
tr = available - ld
return float32(ld), float32(tr)
}
func (r *splitContainerRenderer) minLeadingWidth() float32 {
if r.split.Leading.Visible() {
return r.split.Leading.MinSize().Width
}
return 0
}
func (r *splitContainerRenderer) minLeadingHeight() float32 {
if r.split.Leading.Visible() {
return r.split.Leading.MinSize().Height
}
return 0
}
func (r *splitContainerRenderer) minTrailingWidth() float32 {
if r.split.Trailing.Visible() {
return r.split.Trailing.MinSize().Width
}
return 0
}
func (r *splitContainerRenderer) minTrailingHeight() float32 {
if r.split.Trailing.Visible() {
return r.split.Trailing.MinSize().Height
}
return 0
}
// Declare conformity with interfaces
var _ fyne.CanvasObject = (*divider)(nil)
var _ fyne.Draggable = (*divider)(nil)
var _ desktop.Cursorable = (*divider)(nil)
var _ desktop.Hoverable = (*divider)(nil)
type divider struct {
widget.BaseWidget
split *Split
hovered bool
}
func newDivider(split *Split) *divider {
d := ÷r{
split: split,
}
d.ExtendBaseWidget(d)
return d
}
// CreateRenderer is a private method to Fyne which links this widget to its renderer
func (d *divider) CreateRenderer() fyne.WidgetRenderer {
d.ExtendBaseWidget(d)
background := canvas.NewRectangle(theme.ShadowColor())
foreground := canvas.NewRectangle(theme.ForegroundColor())
return ÷rRenderer{
divider: d,
background: background,
foreground: foreground,
objects: []fyne.CanvasObject{background, foreground},
}
}
func (d *divider) Cursor() desktop.Cursor {
if d.split.Horizontal {
return desktop.HResizeCursor
}
return desktop.VResizeCursor
}
func (d *divider) DragEnd() {
}
func (d *divider) Dragged(event *fyne.DragEvent) {
offset := d.split.Offset
if d.split.Horizontal {
if leadingRatio := float64(d.split.Leading.Size().Width) / float64(d.split.Size().Width); offset < leadingRatio {
offset = leadingRatio
}
if trailingRatio := 1. - (float64(d.split.Trailing.Size().Width) / float64(d.split.Size().Width)); offset > trailingRatio {
offset = trailingRatio
}
offset += float64(event.Dragged.DX) / float64(d.split.Size().Width)
} else {
if leadingRatio := float64(d.split.Leading.Size().Height) / float64(d.split.Size().Height); offset < leadingRatio {
offset = leadingRatio
}
if trailingRatio := 1. - (float64(d.split.Trailing.Size().Height) / float64(d.split.Size().Height)); offset > trailingRatio {
offset = trailingRatio
}
offset += float64(event.Dragged.DY) / float64(d.split.Size().Height)
}
d.split.SetOffset(offset)
}
func (d *divider) MouseIn(event *desktop.MouseEvent) {
d.hovered = true
d.split.Refresh()
}
func (d *divider) MouseMoved(event *desktop.MouseEvent) {}
func (d *divider) MouseOut() {
d.hovered = false
d.split.Refresh()
}
var _ fyne.WidgetRenderer = (*dividerRenderer)(nil)
type dividerRenderer struct {
divider *divider
background *canvas.Rectangle
foreground *canvas.Rectangle
objects []fyne.CanvasObject
}
func (r *dividerRenderer) Destroy() {
}
func (r *dividerRenderer) Layout(size fyne.Size) {
r.background.Resize(size)
var x, y, w, h float32
if r.divider.split.Horizontal {
x = (dividerThickness() - handleThickness()) / 2
y = (size.Height - handleLength()) / 2
w = handleThickness()
h = handleLength()
} else {
x = (size.Width - handleLength()) / 2
y = (dividerThickness() - handleThickness()) / 2
w = handleLength()
h = handleThickness()
}
r.foreground.Move(fyne.NewPos(x, y))
r.foreground.Resize(fyne.NewSize(w, h))
}
func (r *dividerRenderer) MinSize() fyne.Size {
if r.divider.split.Horizontal {
return fyne.NewSize(dividerThickness(), dividerLength())
}
return fyne.NewSize(dividerLength(), dividerThickness())
}
func (r *dividerRenderer) Objects() []fyne.CanvasObject {
return r.objects
}
func (r *dividerRenderer) Refresh() {
if r.divider.hovered {
r.background.FillColor = theme.HoverColor()
} else {
r.background.FillColor = theme.ShadowColor()
}
r.background.Refresh()
r.foreground.FillColor = theme.ForegroundColor()
r.foreground.Refresh()
r.Layout(r.divider.Size())
}
func dividerThickness() float32 {
return theme.Padding() * 2
}
func dividerLength() float32 {
return theme.Padding() * 6
}
func handleThickness() float32 {
return theme.Padding() / 2
}
func handleLength() float32 {
return theme.Padding() * 4
}