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package gui
import (
"fmt"
"github.com/jesseduffield/gocui"
)
type ListContext struct {
GetItemsLength func() int
GetDisplayStrings func(startIdx int, length int) [][]string
OnFocus func() error
OnFocusLost func() error
OnClickSelectedItem func() error
// the boolean here tells us whether the item is nil. This is needed because you can't work it out on the calling end once the pointer is wrapped in an interface (unless you want to use reflection)
SelectedItem func() (ListItem, bool)
OnGetPanelState func() IListPanelState
// if this is true, we'll call GetDisplayStrings for just the visible part of the
// view and re-render that. This is useful when you need to render different
// content based on the selection (e.g. for showing the selected commit)
RenderSelection bool
Gui *Gui
*BasicContext
}
type IListContext interface {
GetSelectedItem() (ListItem, bool)
GetSelectedItemId() string
OnRender() error
handlePrevLine() error
handleNextLine() error
handleScrollLeft() error
handleScrollRight() error
handleLineChange(change int) error
handleNextPage() error
handleGotoTop() error
handleGotoBottom() error
handlePrevPage() error
handleClick() error
onSearchSelect(selectedLineIdx int) error
FocusLine()
GetPanelState() IListPanelState
Context
}
func (self *ListContext) GetPanelState() IListPanelState {
return self.OnGetPanelState()
}
type IListPanelState interface {
SetSelectedLineIdx(int)
GetSelectedLineIdx() int
}
type ListItem interface {
// ID is a SHA when the item is a commit, a filename when the item is a file, 'stash@{4}' when it's a stash entry, 'my_branch' when it's a branch
ID() string
// Description is something we would show in a message e.g. '123as14: push blah' for a commit
Description() string
}
func (self *ListContext) FocusLine() {
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
// ignoring error for now
return
}
// we need a way of knowing whether we've rendered to the view yet.
view.FocusPoint(view.OriginX(), self.GetPanelState().GetSelectedLineIdx())
if self.RenderSelection {
_, originY := view.Origin()
displayStrings := self.GetDisplayStrings(originY, view.InnerHeight())
self.Gui.renderDisplayStringsAtPos(view, originY, displayStrings)
}
view.Footer = formatListFooter(self.GetPanelState().GetSelectedLineIdx(), self.GetItemsLength())
}
func formatListFooter(selectedLineIdx int, length int) string {
return fmt.Sprintf("%d of %d", selectedLineIdx+1, length)
}
func (self *ListContext) GetSelectedItem() (ListItem, bool) {
return self.SelectedItem()
}
func (self *ListContext) GetSelectedItemId() string {
item, ok := self.GetSelectedItem()
if !ok {
return ""
}
return item.ID()
}
// OnFocus assumes that the content of the context has already been rendered to the view. OnRender is the function which actually renders the content to the view
func (self *ListContext) OnRender() error {
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
if self.GetDisplayStrings != nil {
self.Gui.refreshSelectedLine(self.GetPanelState(), self.GetItemsLength())
self.Gui.renderDisplayStrings(view, self.GetDisplayStrings(0, self.GetItemsLength()))
self.Gui.render()
}
return nil
}
func (self *ListContext) HandleFocusLost() error {
if self.OnFocusLost != nil {
return self.OnFocusLost()
}
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
_ = view.SetOriginX(0)
return nil
}
func (self *ListContext) HandleFocus() error {
if self.Gui.popupPanelFocused() {
return nil
}
self.FocusLine()
if self.Gui.State.Modes.Diffing.Active() {
return self.Gui.renderDiff()
}
if self.OnFocus != nil {
return self.OnFocus()
}
return nil
}
func (self *ListContext) HandleRender() error {
return self.OnRender()
}
func (self *ListContext) handlePrevLine() error {
return self.handleLineChange(-1)
}
func (self *ListContext) handleNextLine() error {
return self.handleLineChange(1)
}
func (self *ListContext) handleScrollLeft() error {
return self.scroll(self.Gui.scrollLeft)
}
func (self *ListContext) handleScrollRight() error {
return self.scroll(self.Gui.scrollRight)
}
func (self *ListContext) scroll(scrollFunc func(*gocui.View)) error {
if self.ignoreKeybinding() {
return nil
}
// get the view, move the origin
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
scrollFunc(view)
return self.HandleFocus()
}
func (self *ListContext) ignoreKeybinding() bool {
return !self.Gui.isPopupPanel(self.ViewName) && self.Gui.popupPanelFocused()
}
func (self *ListContext) handleLineChange(change int) error {
if self.ignoreKeybinding() {
return nil
}
selectedLineIdx := self.GetPanelState().GetSelectedLineIdx()
if (change < 0 && selectedLineIdx == 0) || (change > 0 && selectedLineIdx == self.GetItemsLength()-1) {
return nil
}
self.Gui.changeSelectedLine(self.GetPanelState(), self.GetItemsLength(), change)
return self.HandleFocus()
}
func (self *ListContext) handleNextPage() error {
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
delta := self.Gui.pageDelta(view)
return self.handleLineChange(delta)
}
func (self *ListContext) handleGotoTop() error {
return self.handleLineChange(-self.GetItemsLength())
}
func (self *ListContext) handleGotoBottom() error {
return self.handleLineChange(self.GetItemsLength())
}
func (self *ListContext) handlePrevPage() error {
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
delta := self.Gui.pageDelta(view)
return self.handleLineChange(-delta)
}
func (self *ListContext) handleClick() error {
if self.ignoreKeybinding() {
return nil
}
view, err := self.Gui.g.View(self.ViewName)
if err != nil {
return nil
}
prevSelectedLineIdx := self.GetPanelState().GetSelectedLineIdx()
newSelectedLineIdx := view.SelectedLineIdx()
// we need to focus the view
if err := self.Gui.pushContext(self); err != nil {
return err
}
if newSelectedLineIdx > self.GetItemsLength()-1 {
return nil
}
self.GetPanelState().SetSelectedLineIdx(newSelectedLineIdx)
prevViewName := self.Gui.currentViewName()
if prevSelectedLineIdx == newSelectedLineIdx && prevViewName == self.ViewName &&
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