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package main
import (
"fmt"
"strings"
"sync"
log "github.com/Sirupsen/logrus"
)
// OnContextMenuEntrySelected is called when an entry is selected
type OnContextMenuEntrySelected func(entry ContextMenuEntry, entryIndex uint)
// ContextMenuEntry stores the display name and value of
// a context menu item
type ContextMenuEntry struct {
DisplayName string
Value interface{}
}
// ContextMenuConfig is the configuration for the ContextMenuView
// It contains all context menu contextMenuConfig and an observer
type ContextMenuConfig struct {
Entity string
Entries []ContextMenuEntry
OnSelect OnContextMenuEntrySelected
}
type contextMenuViewHandler func(*ContextMenuView, Action) error
// ContextMenuView is a view that displays a context menu
type ContextMenuView struct {
*AbstractWindowView
contextMenuConfig ContextMenuConfig
activeViewPos ViewPos
lastViewDimension ViewDimension
handlers map[ActionType]contextMenuViewHandler
lock sync.Mutex
}
// NewContextMenuView creates a new instance
func NewContextMenuView(contextMenuConfig ContextMenuConfig, channels Channels, config Config, variables GRVVariableSetter) *ContextMenuView {
contextMenuView := &ContextMenuView{
contextMenuConfig: contextMenuConfig,
activeViewPos: NewViewPosition(),
handlers: map[ActionType]contextMenuViewHandler{
ActionSelect: selectContextMenuEntry,
ActionPrevLine: moveUpContextEntry,
ActionNextLine: moveDownContextEntry,
},
}
contextMenuView.AbstractWindowView = NewAbstractWindowView(contextMenuView, channels, config, variables, &contextMenuView.lock, "menu item")
if contextMenuConfig.Entity == "" {
contextMenuView.contextMenuConfig.Entity = "Action"
}
return contextMenuView
}
// ViewID returns the ViewID of the context menu view
func (contextMenuView *ContextMenuView) ViewID() ViewID {
return ViewContextMenu
}
// Render generates the context menu view and writes it to the provided window
func (contextMenuView *ContextMenuView) Render(win RenderWindow) (err error) {
contextMenuView.lock.Lock()
defer contextMenuView.lock.Unlock()
contextMenuView.lastViewDimension = win.ViewDimensions()
winRows := win.Rows() - 2
viewPos := contextMenuView.viewPos()
viewRows := contextMenuView.rows()
viewPos.DetermineViewStartRow(winRows, viewRows)
viewRowIndex := viewPos.ViewStartRowIndex()
startColumn := viewPos.ViewStartColumn()
for rowIndex := uint(0); rowIndex < winRows && viewRowIndex < viewRows; rowIndex++ {
entry := contextMenuView.contextMenuConfig.Entries[viewRowIndex]
if err = win.SetRow(rowIndex+1, startColumn, CmpNone, " %v", entry.DisplayName); err != nil {
return
}
viewRowIndex++
}
win.ApplyStyle(CmpContextMenuContent)
if err = win.SetSelectedRow(viewPos.SelectedRowIndex()+1, ViewStateActive); err != nil {
return
}
win.DrawBorderWithStyle(CmpContextMenuContent)
entity := contextMenuView.contextMenuConfig.Entity
if err = win.SetTitle(CmpContextMenuTitle, "Select %v", entity); err != nil {
return
}
if err = win.SetFooter(CmpContextMenuTitle, "%v %v of %v", entity, viewPos.SelectedRowIndex()+1, viewRows); err != nil {
return
}
return
}
// RenderHelpBar renders a help message for the context menu
func (contextMenuView *ContextMenuView) RenderHelpBar(lineBuilder *LineBuilder) (err error) {
var quitKeyText string
quitKeys := contextMenuView.config.KeyStrings(ActionRemoveView, ViewHierarchy{ViewContextMenu, ViewAll})
if len(quitKeys) > 0 {
quitKeyText = fmt.Sprintf("(Press %v to close menu)", quitKeys[len(quitKeys)-1].keystring)
}
entity := strings.ToLower(contextMenuView.contextMenuConfig.Entity)
lineBuilder.AppendWithStyle(CmpHelpbarviewSpecial, "Select %v %v", entity, quitKeyText)
return
}
func (contextMenuView *ContextMenuView) viewPos() ViewPos {
return contextMenuView.activeViewPos
}
func (contextMenuView *ContextMenuView) rows() uint {
return uint(len(contextMenuView.contextMenuConfig.Entries))
}
func (contextMenuView *ContextMenuView) viewDimension() ViewDimension {
return contextMenuView.lastViewDimension
}
func (contextMenuView *ContextMenuView) onRowSelected(rowIndex uint) (err error) {
return
}
func (contextMenuView *ContextMenuView) line(lineIndex uint) (line string) {
if lineIndex < contextMenuView.rows() {
line = contextMenuView.contextMenuConfig.Entries[lineIndex].DisplayName
}
return
}
// HandleAction handles the action if supported
func (contextMenuView *ContextMenuView) HandleAction(action Action) (err error) {
contextMenuView.lock.Lock()
defer contextMenuView.lock.Unlock()
var handled bool
if handler, ok := contextMenuView.handlers[action.ActionType]; ok {
log.Debugf("Action handled by ContextMenuView")
err = handler(contextMenuView, action)
} else if handled, err = contextMenuView.AbstractWindowView.HandleAction(action); handled {
log.Debugf("Action handled by AbstractWindowView")
} else {
log.Debugf("Action not handled")
}
return
}
func selectContextMenuEntry(contextMenuView *ContextMenuView, action Action) (err error) {
viewPos := contextMenuView.viewPos()
selectedIndex := viewPos.ActiveRowIndex()
selectedEntry := contextMenuView.contextMenuConfig.Entries[selectedIndex]
log.Debugf("Context menu entry selected: %v", selectedEntry)
contextMenuView.channels.DoAction(Action{ActionType: ActionRemoveView})
if contextMenuView.contextMenuConfig.OnSelect != nil {
go contextMenuView.contextMenuConfig.OnSelect(selectedEntry, selectedIndex)
}
return
}
func moveUpContextEntry(contextMenuView *ContextMenuView, action Action) (err error) {
viewPos := contextMenuView.viewPos()
if viewPos.ActiveRowIndex() == 0 {
_, err = contextMenuView.AbstractWindowView.HandleAction(Action{ActionType: ActionLastLine})
} else {
_, err = contextMenuView.AbstractWindowView.HandleAction(action)
}
return
}
func moveDownContextEntry(contextMenuView *ContextMenuView, action Action) (err error) {
rows := contextMenuView.rows()
viewPos := contextMenuView.viewPos()
if viewPos.ActiveRowIndex() == rows-1 {
_, err = contextMenuView.AbstractWindowView.HandleAction(Action{ActionType: ActionFirstLine})
} else {
_, err = contextMenuView.AbstractWindowView.HandleAction(action)
}
return
}
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