This repository has been archived by the owner on Jun 13, 2022. It is now read-only.
forked from rgburke/grv
/
container_view.go
768 lines (618 loc) · 21.5 KB
/
container_view.go
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package main
import (
"fmt"
"sync"
log "github.com/Sirupsen/logrus"
)
const (
terminalAspectRatio = 80.0 / 24.0
)
// ContainerOrientation represents the orientation of the child views
type ContainerOrientation int
// Supported container orientations
const (
CoVertical ContainerOrientation = iota
CoHorizontal
CoDynamic
)
// ChildViewPosition is the position and dimensions of a child view
type ChildViewPosition struct {
viewDimension ViewDimension
startRow uint
startCol uint
}
// ViewLayoutData contains data which can be used to determine the child view layout
type ViewLayoutData struct {
viewDimension ViewDimension
fullScreen bool
orientation ContainerOrientation
activeViewIndex uint
childViewNum uint
}
// ChildViewPositionCalculator calculates the child layout data for the view
type ChildViewPositionCalculator interface {
CalculateChildViewPositions(*ViewLayoutData) []*ChildViewPosition
}
type containerViewHandler func(*ContainerView, Action) error
// ContainerView is a container with no visual presence that manages the
// layout of its child views
type ContainerView struct {
channels Channels
config Config
childViews []BaseView
title string
viewWins map[WindowView]*Window
emptyWin *Window
activeViewIndex uint
handlers map[ActionType]containerViewHandler
orientation ContainerOrientation
childViewPositionCalculator ChildViewPositionCalculator
viewID ViewID
fullScreen bool
childPositions []*ChildViewPosition
styleConfig WindowStyleConfig
viewState ViewState
lock sync.Mutex
}
// NewContainerView creates a new instance
func NewContainerView(channels Channels, config Config) *ContainerView {
containerView := &ContainerView{
config: config,
channels: channels,
orientation: CoVertical,
viewID: ViewContainer,
viewWins: make(map[WindowView]*Window),
styleConfig: DefaultWindowStyleConfig(),
handlers: map[ActionType]containerViewHandler{
ActionNextView: nextContainerChildView,
ActionPrevView: prevContainerChildView,
ActionFullScreenView: toggleFullScreenChildView,
ActionToggleViewLayout: toggleViewOrientation,
ActionAddView: addView,
ActionSplitView: splitView,
ActionRemoveView: removeView,
ActionMouseSelect: childMouseClick,
},
}
containerView.childViewPositionCalculator = containerView
return containerView
}
// AddChildViews adds new child views to this container
func (containerView *ContainerView) AddChildViews(newViews ...BaseView) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
for _, newView := range newViews {
containerView.addChildView(newView)
}
}
func (containerView *ContainerView) addChildView(newView BaseView) {
log.Debugf("Adding new view %T", newView)
containerView.childViews = append(containerView.childViews, newView)
if windowView, isWindowView := newView.(WindowView); isWindowView {
log.Debugf("Creating window for new view %T", newView)
viewIndex := len(containerView.childViews) - 1
winID := fmt.Sprintf("%v-%T", viewIndex, windowView)
win := NewWindowWithStyleConfig(winID, containerView.config, containerView.styleConfig)
containerView.viewWins[windowView] = win
containerView.onStateChange(containerView.viewState)
}
}
// SetChildViewPositionCalculator sets the child layout calculator for this view
func (containerView *ContainerView) SetChildViewPositionCalculator(childViewPositionCalculator ChildViewPositionCalculator) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.childViewPositionCalculator = childViewPositionCalculator
}
// SetOrientation sets the orientation of the view
func (containerView *ContainerView) SetOrientation(orientation ContainerOrientation) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.orientation = orientation
}
// SetTitle sets the title of the view
func (containerView *ContainerView) SetTitle(title string) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.title = title
}
// SetViewID sets the ViewID of the view
func (containerView *ContainerView) SetViewID(viewID ViewID) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.viewID = viewID
}
// SetWindowStyleConfig sets the window style config for the child views
func (containerView *ContainerView) SetWindowStyleConfig(styleConfig WindowStyleConfig) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.styleConfig = styleConfig
}
// Initialise initialises this containers child views
func (containerView *ContainerView) Initialise() (err error) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
for _, childView := range containerView.childViews {
if err = childView.Initialise(); err != nil {
break
}
}
return
}
// Dispose of any resources held by the view
func (containerView *ContainerView) Dispose() {
containerView.lock.Lock()
defer containerView.lock.Unlock()
for !containerView.isEmpty() {
removeView(containerView, Action{ActionType: ActionRemoveView})
}
}
// HandleEvent passes the event on to all child views
func (containerView *ContainerView) HandleEvent(event Event) (err error) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
for _, childView := range containerView.childViews {
if err = childView.HandleEvent(event); err != nil {
return
}
}
return
}
// HandleAction processes the action if supported or passes it on to the active child view
func (containerView *ContainerView) HandleAction(action Action) (err error) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
handler, handlerExists := containerView.handlers[action.ActionType]
if handlerExists {
err = handler(containerView, action)
} else if !containerView.isEmpty() {
err = containerView.activeChildView().HandleAction(action)
}
return
}
// OnStateChange updates the active state of this container and its child views
func (containerView *ContainerView) OnStateChange(viewState ViewState) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
containerView.onStateChange(viewState)
}
func (containerView *ContainerView) onStateChange(viewState ViewState) {
containerView.viewState = viewState
var inactiveChildViewState ViewState
if viewState == ViewStateActive {
inactiveChildViewState = ViewStateInactiveAndVisible
} else {
inactiveChildViewState = viewState
}
for index, childView := range containerView.childViews {
if uint(index) == containerView.activeViewIndex {
childView.OnStateChange(viewState)
} else {
childView.OnStateChange(inactiveChildViewState)
}
}
}
// ViewID returns container view id
func (containerView *ContainerView) ViewID() ViewID {
containerView.lock.Lock()
defer containerView.lock.Unlock()
return containerView.viewID
}
// RenderHelpBar is proxied to the active child view
func (containerView *ContainerView) RenderHelpBar(lineBuilder *LineBuilder) (err error) {
renderHelp := true
if !containerView.isEmpty() {
if _, isContainerView := containerView.activeChildView().(*ContainerView); isContainerView {
renderHelp = false
}
}
if renderHelp {
RenderKeyBindingHelp(containerView.ViewID(), lineBuilder, containerView.config, []ActionMessage{
{action: ActionNextView, message: "Next View"},
{action: ActionPrevView, message: "Prev View"},
{action: ActionFullScreenView, message: "Full Screen"},
{action: ActionToggleViewLayout, message: "Layout"},
})
}
if !containerView.isEmpty() {
err = containerView.activeChildView().RenderHelpBar(lineBuilder)
}
return
}
// Render determines the layout of all child views, renders them and returns the resulting windows
func (containerView *ContainerView) Render(viewDimension ViewDimension) (wins []*Window, err error) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
if containerView.isEmpty() {
wins = append(wins, containerView.renderEmptyView(viewDimension))
return
}
if containerView.orientation == CoDynamic {
containerView.determineOrientation(viewDimension)
}
viewLayoutData := ViewLayoutData{
viewDimension: viewDimension,
fullScreen: containerView.fullScreen,
orientation: containerView.orientation,
activeViewIndex: containerView.activeViewIndex,
childViewNum: uint(len(containerView.childViews)),
}
containerView.childPositions = containerView.childViewPositionCalculator.CalculateChildViewPositions(&viewLayoutData)
for childViewIndex, childView := range containerView.childViews {
childPosition := containerView.childPositions[childViewIndex]
if childPosition.viewDimension.cols == 0 || childPosition.viewDimension.rows == 0 {
continue
}
switch view := childView.(type) {
case WindowView:
var win *Window
win, err = containerView.renderWindowView(view, childPosition)
if err != nil {
return
}
wins = append(wins, win)
win.SetPosition(childPosition.startRow, childPosition.startCol)
case WindowViewCollection:
var childWins []*Window
childWins, err = view.Render(childPosition.viewDimension)
if err != nil {
return
}
for _, win := range childWins {
win.OffsetPosition(int(childPosition.startRow), int(childPosition.startCol))
}
wins = append(wins, childWins...)
default:
log.Errorf("Unsupported view type: %T", view)
}
}
return
}
func (containerView *ContainerView) determineOrientation(viewDimension ViewDimension) {
viewAspectRation := float64(viewDimension.cols) / float64(viewDimension.rows)
log.Debugf("View aspect ration: %v", viewAspectRation)
var orientation ContainerOrientation
if viewAspectRation < terminalAspectRatio {
orientation = CoHorizontal
} else {
orientation = CoVertical
}
containerView.orientation = orientation
}
// CalculateChildViewPositions calculates the child layout data for this view
func (containerView *ContainerView) CalculateChildViewPositions(viewLayoutData *ViewLayoutData) (childPositions []*ChildViewPosition) {
switch {
case viewLayoutData.fullScreen:
for i := uint(0); i < viewLayoutData.childViewNum; i++ {
childPositions = append(childPositions, &ChildViewPosition{
viewDimension: ViewDimension{
rows: 0,
cols: 0,
},
startRow: 0,
startCol: 0,
})
}
childPositions[viewLayoutData.activeViewIndex].viewDimension = viewLayoutData.viewDimension
case viewLayoutData.orientation == CoVertical:
width := uint(viewLayoutData.viewDimension.cols / viewLayoutData.childViewNum)
startCol := uint(0)
for i := uint(0); i < viewLayoutData.childViewNum; i++ {
childPositions = append(childPositions, &ChildViewPosition{
viewDimension: ViewDimension{
rows: viewLayoutData.viewDimension.rows,
cols: width,
},
startRow: 0,
startCol: startCol,
})
startCol += width
}
childPositions[len(childPositions)-1].viewDimension.cols += viewLayoutData.viewDimension.cols % viewLayoutData.childViewNum
case viewLayoutData.orientation == CoHorizontal:
height := uint(viewLayoutData.viewDimension.rows / viewLayoutData.childViewNum)
startRow := uint(0)
for i := uint(0); i < viewLayoutData.childViewNum; i++ {
childPositions = append(childPositions, &ChildViewPosition{
viewDimension: ViewDimension{
rows: height,
cols: viewLayoutData.viewDimension.cols,
},
startRow: startRow,
startCol: 0,
})
startRow += height
}
childPositions[len(childPositions)-1].viewDimension.rows += viewLayoutData.viewDimension.rows % viewLayoutData.childViewNum
}
return
}
func (containerView *ContainerView) renderWindowView(childView WindowView, childPosition *ChildViewPosition) (*Window, error) {
win := containerView.viewWins[childView]
win.Resize(childPosition.viewDimension)
win.SetPosition(childPosition.startRow, childPosition.startCol)
win.Clear()
if err := childView.Render(win); err != nil {
return nil, err
}
return win, nil
}
func (containerView *ContainerView) renderEmptyView(viewDimension ViewDimension) *Window {
if containerView.emptyWin == nil {
containerView.emptyWin = NewWindowWithStyleConfig("empty", containerView.config, containerView.styleConfig)
}
win := containerView.emptyWin
win.Resize(viewDimension)
win.Clear()
return win
}
// ActiveView returns the active child view
func (containerView *ContainerView) ActiveView() BaseView {
containerView.lock.Lock()
defer containerView.lock.Unlock()
if containerView.isEmpty() {
return containerView
}
return containerView.activeChildView()
}
// Title returns the title of the container view
func (containerView *ContainerView) Title() string {
containerView.lock.Lock()
defer containerView.lock.Unlock()
return containerView.title
}
// IsEmpty returns true if this container view has no child views
func (containerView *ContainerView) IsEmpty() bool {
containerView.lock.Lock()
defer containerView.lock.Unlock()
return containerView.isEmpty()
}
func (containerView *ContainerView) isEmpty() bool {
return len(containerView.childViews) == 0
}
func (containerView *ContainerView) activeChildView() BaseView {
return containerView.childViews[containerView.activeViewIndex]
}
func (containerView *ContainerView) removeActiveChildView() {
if containerView.isEmpty() {
return
}
index := containerView.activeViewIndex
childView := containerView.activeChildView()
log.Debugf("Removing child view %T at index %v", childView, index)
containerView.childViews = append(containerView.childViews[:index], containerView.childViews[index+1:]...)
childViewNum := uint(len(containerView.childViews))
if index > 0 && index >= childViewNum {
if childViewNum > 0 {
containerView.activeViewIndex = childViewNum - 1
} else {
containerView.activeViewIndex = 0
}
}
}
// NextView changes the active view to the next child view
// Return value is true if the active child view wrapped back to the first
func (containerView *ContainerView) NextView() (wrapped bool) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
return containerView.nextView()
}
func (containerView *ContainerView) nextView() (wrapped bool) {
if containerView.isEmpty() {
return
}
switch childView := containerView.activeChildView().(type) {
case WindowView:
if len(containerView.childViews) > 1 {
if containerView.activeViewIndex == uint(len(containerView.childViews)-1) {
wrapped = true
} else {
containerView.setActiveViewAndActivateFirstChild(containerView.activeViewIndex + 1)
}
} else {
wrapped = true
}
case *ContainerView:
if childView.NextView() {
wrapped = containerView.activeViewIndex == uint(len(containerView.childViews)-1)
if !wrapped {
containerView.setActiveViewAndActivateFirstChild(containerView.activeViewIndex + 1)
}
}
}
return
}
// PrevView changes the active child view to the previous child view
// Return value is true if the active child view wrapped back to the last
func (containerView *ContainerView) PrevView() (wrapped bool) {
containerView.lock.Lock()
defer containerView.lock.Unlock()
return containerView.prevView()
}
func (containerView *ContainerView) prevView() (wrapped bool) {
if containerView.isEmpty() {
return
}
switch childView := containerView.activeChildView().(type) {
case WindowView:
if len(containerView.childViews) > 1 {
if containerView.activeViewIndex == 0 {
wrapped = true
} else {
containerView.setActiveViewAndActivateLastChild(containerView.activeViewIndex - 1)
}
} else {
wrapped = true
}
case *ContainerView:
if childView.PrevView() {
wrapped = containerView.activeViewIndex == 0
if !wrapped {
containerView.setActiveViewAndActivateLastChild(containerView.activeViewIndex - 1)
}
}
}
return
}
func (containerView *ContainerView) setActiveViewAndActivateFirstChild(activeViewIndex uint) {
containerView.activeViewIndex = activeViewIndex
if newChildView, isContainerView := containerView.activeChildView().(*ContainerView); isContainerView {
newChildView.setActiveViewAndActivateFirstChild(0)
}
}
func (containerView *ContainerView) setActiveViewAndActivateLastChild(activeViewIndex uint) {
containerView.activeViewIndex = activeViewIndex
if newChildView, isContainerView := containerView.activeChildView().(*ContainerView); isContainerView {
newChildView.setActiveViewAndActivateLastChild(uint(len(newChildView.childViews) - 1))
}
}
func nextContainerChildView(containerView *ContainerView, action Action) (err error) {
if containerView.nextView() {
if containerView.activeViewIndex == uint(len(containerView.childViews)-1) {
containerView.setActiveViewAndActivateFirstChild(0)
} else {
containerView.setActiveViewAndActivateFirstChild(containerView.activeViewIndex + 1)
}
}
containerView.onStateChange(containerView.viewState)
containerView.channels.UpdateDisplay()
return
}
func prevContainerChildView(containerView *ContainerView, action Action) (err error) {
if containerView.prevView() {
if containerView.activeViewIndex == 0 {
containerView.setActiveViewAndActivateLastChild(uint(len(containerView.childViews) - 1))
} else {
containerView.setActiveViewAndActivateLastChild(containerView.activeViewIndex - 1)
}
}
containerView.onStateChange(containerView.viewState)
containerView.channels.UpdateDisplay()
return
}
func toggleFullScreenChildView(containerView *ContainerView, action Action) (err error) {
containerView.fullScreen = !containerView.fullScreen
for _, childView := range containerView.childViews {
if _, isContainerView := childView.(WindowViewCollection); isContainerView {
if err = childView.HandleAction(action); err != nil {
break
}
}
}
containerView.channels.UpdateDisplay()
return
}
func toggleViewOrientation(containerView *ContainerView, action Action) (err error) {
if containerView.isEmpty() {
return
}
switch childView := containerView.activeChildView().(type) {
case WindowView:
if containerView.orientation == CoVertical {
containerView.orientation = CoHorizontal
} else {
containerView.orientation = CoVertical
}
case WindowViewCollection:
err = childView.HandleAction(action)
}
containerView.channels.UpdateDisplay()
return
}
func addView(containerView *ContainerView, action Action) (err error) {
if !containerView.isEmpty() {
if child, isContainerView := containerView.activeChildView().(*ContainerView); isContainerView {
return child.HandleAction(action)
}
}
args := action.Args
if len(args) < 1 {
return fmt.Errorf("Execpted view but received: %v", args)
}
newView, ok := args[0].(BaseView)
if !ok {
return fmt.Errorf("Execpted second argument to be BaseView but got %T", args[0])
}
containerView.addChildView(newView)
return
}
func splitView(containerView *ContainerView, action Action) (err error) {
args := action.Args
if len(args) < 2 {
return fmt.Errorf("Execpted orientation and view but received: %v", args)
}
orientation, ok := args[0].(ContainerOrientation)
if !ok {
return fmt.Errorf("Execpted first argument to be orientation but got %T", args[0])
}
newView, ok := args[1].(WindowView)
if !ok {
return fmt.Errorf("Execpted second argument to be WindowView but got %T", args[1])
}
if containerView.isEmpty() {
containerView.addChildView(newView)
return
}
switch childView := containerView.activeChildView().(type) {
case WindowView:
if len(containerView.childViews) < 2 {
containerView.addChildView(newView)
containerView.orientation = orientation
} else {
newContainer := NewContainerView(containerView.channels, containerView.config)
newContainer.SetWindowStyleConfig(containerView.styleConfig)
newContainer.SetOrientation(orientation)
newContainer.AddChildViews(childView, newView)
containerView.childViews[containerView.activeViewIndex] = newContainer
newContainer.OnStateChange(containerView.viewState)
}
containerView.channels.UpdateDisplay()
log.Infof("Created orientation %v split between views %T and %T", orientation, childView, newView)
case WindowViewCollection:
err = childView.HandleAction(action)
}
return
}
func removeView(containerView *ContainerView, action Action) (err error) {
if containerView.isEmpty() {
return
}
if childView, isContainerView := containerView.activeChildView().(*ContainerView); isContainerView {
err = childView.HandleAction(action)
if childView.isEmpty() {
containerView.removeActiveChildView()
}
} else {
childView := containerView.activeChildView()
containerView.removeActiveChildView()
containerView.channels.ReportEvent(Event{
EventType: ViewRemovedEvent,
Args: []interface{}{childView},
})
}
containerView.onStateChange(containerView.viewState)
containerView.channels.UpdateDisplay()
return
}
func childMouseClick(containerView *ContainerView, action Action) (err error) {
if containerView.isEmpty() {
return
}
mouseEvent, err := GetMouseEventFromAction(action)
if err != nil {
return
}
for childIndex, childPosition := range containerView.childPositions {
if mouseEvent.row >= childPosition.startRow && mouseEvent.row < childPosition.startRow+childPosition.viewDimension.rows &&
mouseEvent.col >= childPosition.startCol && mouseEvent.col < childPosition.startCol+childPosition.viewDimension.cols {
containerView.activeViewIndex = uint(childIndex)
mouseEvent.col -= childPosition.startCol
mouseEvent.row -= childPosition.startRow
action.Args[0] = mouseEvent
err = containerView.activeChildView().HandleAction(action)
break
}
}
containerView.onStateChange(containerView.viewState)
containerView.channels.UpdateDisplay()
return
}