1 files changed, 408 insertions, 0 deletions
diff --git a/vendor/maunium.net/go/tview/application.go b/vendor/maunium.net/go/tview/application.go
new file mode 100644
index 0000000..f3d6328
--- /dev/null
+++ b/vendor/maunium.net/go/tview/application.go
@@ -0,0 +1,408 @@
+package tview
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"maunium.net/go/tcell"
+)
+
+// Application represents the top node of an application.
+//
+// It is not strictly required to use this class as none of the other classes
+// depend on it. However, it provides useful tools to set up an application and
+// plays nicely with all widgets.
+type Application struct {
+	sync.RWMutex
+
+	// The application's screen.
+	screen tcell.Screen
+
+	// The primitive which currently has the keyboard focus.
+	focus Primitive
+
+	// The root primitive to be seen on the screen.
+	root Primitive
+
+	// Whether or not the application resizes the root primitive.
+	rootFullscreen bool
+
+	// An optional capture function which receives a key event and returns the
+	// event to be forwarded to the default input handler (nil if nothing should
+	// be forwarded).
+	inputCapture func(event *tcell.EventKey) *tcell.EventKey
+
+	// An optional capture function which receives a mouse event and returns the
+	// event to be forwarded to the default input handler (nil if nothing should
+	// be forwarded).
+	mouseCapture func(event *tcell.EventMouse) *tcell.EventMouse
+
+	// An optional callback function which is invoked just before the root
+	// primitive is drawn.
+	beforeDraw func(screen tcell.Screen) bool
+
+	// An optional callback function which is invoked after the root primitive
+	// was drawn.
+	afterDraw func(screen tcell.Screen)
+
+	// If this value is true, the application has entered suspended mode.
+	suspended bool
+}
+
+// NewApplication creates and returns a new application.
+func NewApplication() *Application {
+	return &Application{}
+}
+
+// SetInputCapture sets a function which captures all key events before they are
+// forwarded to the key event handler of the primitive which currently has
+// focus. This function can then choose to forward that key event (or a
+// different one) by returning it or stop the key event processing by returning
+// nil.
+//
+// Note that this also affects the default event handling of the application
+// itself: Such a handler can intercept the Ctrl-C event which closes the
+// applicatoon.
+func (a *Application) SetInputCapture(capture func(event *tcell.EventKey) *tcell.EventKey) *Application {
+	a.inputCapture = capture
+	return a
+}
+
+// GetInputCapture returns the function installed with SetInputCapture() or nil
+// if no such function has been installed.
+func (a *Application) GetInputCapture() func(event *tcell.EventKey) *tcell.EventKey {
+	return a.inputCapture
+}
+
+// SetMouseCapture sets a function which captures all mouse events before they are
+// forwarded to the mouse event handler of the primitive which currently has
+// focus. This function can then choose to forward that mouse event (or a
+// different one) by returning it or stop the key event processing by returning
+// nil.
+func (a *Application) SetMouseCapture(capture func(event *tcell.EventMouse) *tcell.EventMouse) *Application {
+	a.mouseCapture = capture
+	return a
+}
+
+// GetMouseCapture returns the function installed with SetMouseCapture() or nil
+// if no such function has been installed.
+func (a *Application) GetMouseCapture() func(event *tcell.EventMouse) *tcell.EventMouse {
+	return a.mouseCapture
+}
+
+func (a *Application) GetScreen() tcell.Screen {
+	return a.screen
+}
+
+// Run starts the application and thus the event loop. This function returns
+// when Stop() was called.
+func (a *Application) Run() error {
+	var err error
+	a.Lock()
+
+	// Make a screen.
+	a.screen, err = tcell.NewScreen()
+	if err != nil {
+		a.Unlock()
+		return err
+	}
+	if err = a.screen.Init(); err != nil {
+		a.Unlock()
+		return err
+	}
+	a.screen.EnableMouse()
+
+	// Draw the screen for the first time.
+	a.Unlock()
+	a.Draw()
+
+	// Start event loop.
+	for {
+		a.Lock()
+		screen := a.screen
+		if a.suspended {
+			a.suspended = false // Clear previous suspended flag.
+		}
+		a.Unlock()
+		if screen == nil {
+			break
+		}
+
+		// Wait for next event.
+		event := a.screen.PollEvent()
+		if event == nil {
+			a.Lock()
+			if a.suspended {
+				// This screen was renewed due to suspended mode.
+				a.suspended = false
+				a.Unlock()
+				continue // Resume.
+			}
+			a.Unlock()
+
+			// The screen was finalized. Exit the loop.
+			break
+		}
+
+		switch event := event.(type) {
+		case *tcell.EventKey:
+			a.RLock()
+			p := a.focus
+			a.RUnlock()
+
+			// Intercept keys.
+			if a.inputCapture != nil {
+				event = a.inputCapture(event)
+				if event == nil {
+					break // Don't forward event.
+				}
+			}
+
+			// Pass other key events to the currently focused primitive.
+			if p != nil {
+				if handler := p.InputHandler(); handler != nil {
+					handler(event, func(p Primitive) {
+						a.SetFocus(p)
+					})
+					a.Draw()
+				}
+			}
+		case *tcell.EventMouse:
+			a.RLock()
+			p := a.focus
+			a.RUnlock()
+
+			// Intercept keys.
+			if a.mouseCapture != nil {
+				event = a.mouseCapture(event)
+				if event == nil {
+					break // Don't forward event.
+				}
+			}
+
+			// Pass other key events to the currently focused primitive.
+			if p != nil {
+				if handler := p.MouseHandler(); handler != nil {
+					handler(event, func(p Primitive) {
+						a.SetFocus(p)
+					})
+					//a.Draw()
+				}
+			}
+		case *tcell.EventResize:
+			a.Lock()
+			screen := a.screen
+			a.Unlock()
+			screen.Clear()
+			a.Draw()
+		}
+	}
+
+	return nil
+}
+
+// Stop stops the application, causing Run() to return.
+func (a *Application) Stop() {
+	a.RLock()
+	defer a.RUnlock()
+	if a.screen == nil {
+		return
+	}
+	a.screen.Fini()
+	a.screen = nil
+}
+
+// Suspend temporarily suspends the application by exiting terminal UI mode and
+// invoking the provided function "f". When "f" returns, terminal UI mode is
+// entered again and the application resumes.
+//
+// A return value of true indicates that the application was suspended and "f"
+// was called. If false is returned, the application was already suspended,
+// terminal UI mode was not exited, and "f" was not called.
+func (a *Application) Suspend(f func()) bool {
+	a.Lock()
+
+	if a.suspended || a.screen == nil {
+		// Application is already suspended.
+		a.Unlock()
+		return false
+	}
+
+	// Enter suspended mode.
+	a.suspended = true
+	a.Unlock()
+	a.Stop()
+
+	// Deal with panics during suspended mode. Exit the program.
+	defer func() {
+		if p := recover(); p != nil {
+			fmt.Println(p)
+			os.Exit(1)
+		}
+	}()
+
+	// Wait for "f" to return.
+	f()
+
+	// Make a new screen and redraw.
+	a.Lock()
+	var err error
+	a.screen, err = tcell.NewScreen()
+	if err != nil {
+		a.Unlock()
+		panic(err)
+	}
+	if err = a.screen.Init(); err != nil {
+		a.Unlock()
+		panic(err)
+	}
+	a.Unlock()
+	a.Draw()
+
+	// Continue application loop.
+	return true
+}
+
+// Draw refreshes the screen. It calls the Draw() function of the application's
+// root primitive and then syncs the screen buffer.
+func (a *Application) Draw() *Application {
+	a.RLock()
+	screen := a.screen
+	root := a.root
+	fullscreen := a.rootFullscreen
+	before := a.beforeDraw
+	after := a.afterDraw
+	a.RUnlock()
+
+	// Maybe we're not ready yet or not anymore.
+	if screen == nil || root == nil {
+		return a
+	}
+
+	// Resize if requested.
+	if fullscreen && root != nil {
+		width, height := screen.Size()
+		root.SetRect(0, 0, width, height)
+	}
+
+	// Call before handler if there is one.
+	if before != nil {
+		if before(screen) {
+			screen.Show()
+			return a
+		}
+	}
+
+	// Draw all primitives.
+	root.Draw(screen)
+
+	// Call after handler if there is one.
+	if after != nil {
+		after(screen)
+	}
+
+	// Sync screen.
+	screen.Show()
+
+	return a
+}
+
+// SetBeforeDrawFunc installs a callback function which is invoked just before
+// the root primitive is drawn during screen updates. If the function returns
+// true, drawing will not continue, i.e. the root primitive will not be drawn
+// (and an after-draw-handler will not be called).
+//
+// Note that the screen is not cleared by the application. To clear the screen,
+// you may call screen.Clear().
+//
+// Provide nil to uninstall the callback function.
+func (a *Application) SetBeforeDrawFunc(handler func(screen tcell.Screen) bool) *Application {
+	a.beforeDraw = handler
+	return a
+}
+
+// GetBeforeDrawFunc returns the callback function installed with
+// SetBeforeDrawFunc() or nil if none has been installed.
+func (a *Application) GetBeforeDrawFunc() func(screen tcell.Screen) bool {
+	return a.beforeDraw
+}
+
+// SetAfterDrawFunc installs a callback function which is invoked after the root
+// primitive was drawn during screen updates.
+//
+// Provide nil to uninstall the callback function.
+func (a *Application) SetAfterDrawFunc(handler func(screen tcell.Screen)) *Application {
+	a.afterDraw = handler
+	return a
+}
+
+// GetAfterDrawFunc returns the callback function installed with
+// SetAfterDrawFunc() or nil if none has been installed.
+func (a *Application) GetAfterDrawFunc() func(screen tcell.Screen) {
+	return a.afterDraw
+}
+
+// SetRoot sets the root primitive for this application. If "fullscreen" is set
+// to true, the root primitive's position will be changed to fill the screen.
+//
+// This function must be called at least once or nothing will be displayed when
+// the application starts.
+//
+// It also calls SetFocus() on the primitive.
+func (a *Application) SetRoot(root Primitive, fullscreen bool) *Application {
+	a.Lock()
+	a.root = root
+	a.rootFullscreen = fullscreen
+	if a.screen != nil {
+		a.screen.Clear()
+	}
+	a.Unlock()
+
+	a.SetFocus(root)
+
+	return a
+}
+
+// ResizeToFullScreen resizes the given primitive such that it fills the entire
+// screen.
+func (a *Application) ResizeToFullScreen(p Primitive) *Application {
+	a.RLock()
+	width, height := a.screen.Size()
+	a.RUnlock()
+	p.SetRect(0, 0, width, height)
+	return a
+}
+
+// SetFocus sets the focus on a new primitive. All key events will be redirected
+// to that primitive. Callers must ensure that the primitive will handle key
+// events.
+//
+// Blur() will be called on the previously focused primitive. Focus() will be
+// called on the new primitive.
+func (a *Application) SetFocus(p Primitive) *Application {
+	a.Lock()
+	if a.focus != nil {
+		a.focus.Blur()
+	}
+	a.focus = p
+	if a.screen != nil {
+		a.screen.HideCursor()
+	}
+	a.Unlock()
+	if p != nil {
+		p.Focus(func(p Primitive) {
+			a.SetFocus(p)
+		})
+	}
+
+	return a
+}
+
+// GetFocus returns the primitive which has the current focus. If none has it,
+// nil is returned.
+func (a *Application) GetFocus() Primitive {
+	a.RLock()
+	defer a.RUnlock()
+	return a.focus
+}