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/
message_box_view.go
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/
message_box_view.go
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package main
import (
"fmt"
"regexp"
"strings"
"sync"
log "github.com/Sirupsen/logrus"
)
const (
messageBoxRows = 5
messageBoxMaxCols = 60
messageBoxColPadding = 4
messageBoxMaxWritableWidth = messageBoxMaxCols - messageBoxColPadding
messageBoxNonMessageRows = 4
)
var whiteSpaceRegexp = regexp.MustCompile(`\s`)
// OnMessageBoxButtonSelected is called when a button is selected
type OnMessageBoxButtonSelected func(MessageBoxButton)
// MessageBoxButton represents a button
type MessageBoxButton string
// The set of buttons available
const (
ButtonCancel MessageBoxButton = "Cancel"
ButtonOK MessageBoxButton = "OK"
ButtonYes MessageBoxButton = "Yes"
ButtonNo MessageBoxButton = "No"
)
// MessageBoxConfig is the configuration for the MessageBoxView
type MessageBoxConfig struct {
Title string
Message string
Buttons []MessageBoxButton
OnSelect OnMessageBoxButtonSelected
}
type messageBoxViewHandler func(*MessageBoxView, Action) error
// MessageBoxView is a view that displays message box
type MessageBoxView struct {
*AbstractWindowView
messageBoxConfig MessageBoxConfig
activeViewPos ViewPos
lastViewDimension ViewDimension
selectedButtonIndex uint
handlers map[ActionType]messageBoxViewHandler
lock sync.Mutex
}
// NewMessageBoxView creates a new instance
func NewMessageBoxView(messageBoxConfig MessageBoxConfig, channels Channels, config Config, variables GRVVariableSetter) *MessageBoxView {
messageBoxView := &MessageBoxView{
messageBoxConfig: messageBoxConfig,
activeViewPos: NewViewPosition(),
handlers: map[ActionType]messageBoxViewHandler{
ActionSelect: chooseMessageBoxButton,
ActionNextButton: selectNextMessageButton,
ActionPrevButton: selectPrevMessageButton,
ActionMouseSelect: mouseSelectButton,
},
}
messageBoxView.AbstractWindowView = NewAbstractWindowView(messageBoxView, channels, config, variables, &messageBoxView.lock, "message box row")
return messageBoxView
}
// ViewID returns the ViewID of the message box view
func (messageBoxView *MessageBoxView) ViewID() ViewID {
return ViewMessageBox
}
// Render generates the message box view and writes it to the provided window
func (messageBoxView *MessageBoxView) Render(win RenderWindow) (err error) {
messageBoxView.lock.Lock()
defer messageBoxView.lock.Unlock()
messageBoxView.lastViewDimension = win.ViewDimensions()
buttonsWidth := messageBoxView.buttonsWidth()
if win.Rows() < messageBoxRows || win.Cols() < buttonsWidth {
log.Errorf("Unable to render MessageBoxView - too few rows and/or columns: %v", win.ViewDimensions())
return
}
messageRows := win.Rows() - messageBoxNonMessageRows
message := messageBoxView.messageBoxConfig.Message
words := whiteSpaceRegexp.Split(message, -1)
rowCols := win.Cols() - messageBoxColPadding
rowIndex := uint(1)
colIndex := uint(0)
lineBuilder, err := win.LineBuilder(rowIndex, 1)
if err != nil {
return
}
lineBuilder.Append(" ")
OuterLoop:
for _, word := range words {
wordWidth := uint(StringWidth(word))
if colIndex+wordWidth > rowCols {
remainingWordWidth := wordWidth
runeStartIndex := uint(0)
runes := []rune(word)
for {
rowIndex++
colIndex = 0
if rowIndex-1 >= messageRows {
lineBuilder.Append("...")
break OuterLoop
}
lineBuilder, err = win.LineBuilder(rowIndex, 1)
if err != nil {
return
}
lineBuilder.Append(" ")
endRuneIndex := runeStartIndex + MinUInt(rowCols, uint(len(runes))-runeStartIndex)
subWord := string(runes[runeStartIndex:endRuneIndex])
lineBuilder.Append("%v ", subWord)
runeStartIndex = endRuneIndex
subWordWidth := uint(StringWidth(subWord))
remainingWordWidth -= subWordWidth
colIndex += subWordWidth
if remainingWordWidth == 0 || runeStartIndex >= uint(len(runes)) {
break
}
}
} else {
lineBuilder.Append("%v ", word)
colIndex += wordWidth + 1
}
}
win.ApplyStyle(CmpMessageBoxContent)
buttonsRowIndex := win.Rows() - 2
lineBuilder, err = win.LineBuilder(buttonsRowIndex, 1)
if err != nil {
return
}
lineBuilder.AppendWithStyle(CmpMessageBoxContent, " ")
paddingSize := rowCols - buttonsWidth
lineBuilder.AppendWithStyle(CmpMessageBoxContent, "%v", strings.Repeat(" ", int(paddingSize)))
for buttonIndex, button := range messageBoxView.messageBoxConfig.Buttons {
themeComponentID := CmpMessageBoxContent
if uint(buttonIndex) == messageBoxView.selectedButtonIndex {
themeComponentID = CmpMessageBoxSelectedButton
}
lineBuilder.AppendWithStyle(themeComponentID, "<%v>", button)
lineBuilder.AppendWithStyle(CmpMessageBoxContent, " ")
}
win.DrawBorderWithStyle(CmpMessageBoxContent)
if messageBoxView.messageBoxConfig.Title != "" {
if err = win.SetTitle(CmpMessageBoxTitle, "%v", messageBoxView.messageBoxConfig.Title); err != nil {
return
}
}
return
}
// RenderHelpBar renders a help message for the message box view
func (messageBoxView *MessageBoxView) RenderHelpBar(lineBuilder *LineBuilder) (err error) {
quitKeys := messageBoxView.config.KeyStrings(ActionRemoveView, ViewHierarchy{ViewMessageBox, ViewAll})
if len(quitKeys) > 0 {
quitKeyText := fmt.Sprintf("Press %v to close the message box", quitKeys[len(quitKeys)-1].keystring)
lineBuilder.AppendWithStyle(CmpHelpbarviewSpecial, " %v", quitKeyText)
}
return
}
func (messageBoxView *MessageBoxView) viewPos() ViewPos {
return messageBoxView.activeViewPos
}
func (messageBoxView *MessageBoxView) rows() uint {
return messageBoxRows - 2
}
func (messageBoxView *MessageBoxView) viewDimension() ViewDimension {
return messageBoxView.lastViewDimension
}
func (messageBoxView *MessageBoxView) onRowSelected(rowIndex uint) (err error) {
return
}
func (messageBoxView *MessageBoxView) buttons() uint {
return uint(len(messageBoxView.messageBoxConfig.Buttons))
}
func (messageBoxView *MessageBoxView) line(lineIndex uint) (line string) {
return
}
// ViewDimension calculates the view dimensions required to display
// the message box correctly
func (messageBoxView *MessageBoxView) ViewDimension() ViewDimension {
messageBoxView.lock.Lock()
defer messageBoxView.lock.Unlock()
message := messageBoxView.messageBoxConfig.Message
words := whiteSpaceRegexp.Split(message, -1)
requiredRows := uint(1)
requiredCols := uint(0)
for _, word := range words {
wordWidth := uint(StringWidth(word)) + 1
if requiredCols+wordWidth > messageBoxMaxWritableWidth {
if wordWidth > messageBoxMaxWritableWidth {
requiredRows += (wordWidth / messageBoxMaxWritableWidth) + 1
requiredCols = wordWidth % messageBoxMaxWritableWidth
} else {
requiredRows++
requiredCols = wordWidth
}
} else {
requiredCols += wordWidth
}
}
if requiredRows > 1 {
requiredCols = messageBoxMaxCols
} else {
requiredCols += messageBoxColPadding
requiredCols--
}
buttonsRequiredCols := messageBoxView.buttonsWidth() + messageBoxColPadding
requiredCols = MaxUInt(requiredCols, buttonsRequiredCols)
requiredRows += messageBoxNonMessageRows
return ViewDimension{
rows: requiredRows,
cols: requiredCols,
}
}
func (messageBoxView *MessageBoxView) buttonsWidth() (buttonsWidth uint) {
for _, button := range messageBoxView.messageBoxConfig.Buttons {
buttonsWidth += uint(StringWidth(string(button))) + 3
}
if buttonsWidth > 0 {
buttonsWidth--
}
return
}
func (messageBoxView *MessageBoxView) selectButton(button MessageBoxButton) {
log.Debugf("Selected button: %v", button)
messageBoxView.channels.DoAction(Action{ActionType: ActionRemoveView})
if messageBoxView.messageBoxConfig.OnSelect != nil {
go messageBoxView.messageBoxConfig.OnSelect(button)
}
}
// HandleAction handles the action if supported
func (messageBoxView *MessageBoxView) HandleAction(action Action) (err error) {
messageBoxView.lock.Lock()
defer messageBoxView.lock.Unlock()
if handler, ok := messageBoxView.handlers[action.ActionType]; ok {
log.Debugf("Action handled by MessageBoxView")
err = handler(messageBoxView, action)
} else {
log.Debugf("Action not handled")
}
return
}
func chooseMessageBoxButton(messageBoxView *MessageBoxView, action Action) (err error) {
button := messageBoxView.messageBoxConfig.Buttons[messageBoxView.selectedButtonIndex]
messageBoxView.selectButton(button)
return
}
func selectNextMessageButton(messageBoxView *MessageBoxView, action Action) (err error) {
messageBoxView.selectedButtonIndex++
if messageBoxView.selectedButtonIndex == messageBoxView.buttons() {
messageBoxView.selectedButtonIndex = 0
}
messageBoxView.channels.UpdateDisplay()
return
}
func selectPrevMessageButton(messageBoxView *MessageBoxView, action Action) (err error) {
if messageBoxView.selectedButtonIndex == 0 {
messageBoxView.selectedButtonIndex = messageBoxView.buttons() - 1
} else {
messageBoxView.selectedButtonIndex--
}
messageBoxView.channels.UpdateDisplay()
return
}
func mouseSelectButton(messageBoxView *MessageBoxView, action Action) (err error) {
mouseEvent, err := GetMouseEventFromAction(action)
if err != nil {
return
}
if mouseEvent.row != messageBoxView.lastViewDimension.rows-2 {
return
}
buttonsWidth := messageBoxView.buttonsWidth()
startColumn := messageBoxView.lastViewDimension.cols - (buttonsWidth + 2)
if mouseEvent.col < startColumn {
return
}
currentColumn := startColumn
for _, button := range messageBoxView.messageBoxConfig.Buttons {
buttonLength := uint(len(button)) + 2
if mouseEvent.col >= currentColumn && mouseEvent.col < currentColumn+buttonLength {
log.Debugf("Mouse click on button: %v", button)
messageBoxView.selectButton(button)
break
}
currentColumn += buttonLength + 1
}
return
}