fixes #44 Expose some capability info

console_win.go

@@ -1,6 +1,6 @@
 // +build windows
 
-// Copyright 2015 The TCell Authors
+// Copyright 2016 The TCell Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -934,4 +934,49 @@ func (s *cScreen) CanDisplay(r rune, checkFallbacks bool) bool {
 	return true
 }
 
+func (s *cScreen) HasMouse() bool {
+	return true
+}
+
 func (s *cScreen) Resize(int, int, int, int) {}
+
+func (s *cScreen) HasKey(k Key) bool {
+
+	// Microsoft has codes for some keys, but they are unusual,
+	// so we don't include them.  We include all the typical
+	// 101, 105 key layout keys.
+	valid := map[Key]bool{
+		KeyBackspace: true,
+		KeyTab:       true,
+		KeyEscape:    true,
+		KeySpace:     true,
+		KeyPause:     true,
+		KeyPrint:     true,
+		KeyPgUp:      true,
+		KeyPgDn:      true,
+		KeyEnter:     true,
+		KeyEnd:       true,
+		KeyHome:      true,
+		KeyLeft:      true,
+		KeyUp:        true,
+		KeyRight:     true,
+		KeyDown:      true,
+		KeyInsert:    true,
+		KeyDelete:    true,
+		KeyF1:        true,
+		KeyF2:        true,
+		KeyF3:        true,
+		KeyF4:        true,
+		KeyF5:        true,
+		KeyF6:        true,
+		KeyF7:        true,
+		KeyF8:        true,
+		KeyF9:        true,
+		KeyF10:       true,
+		KeyF11:       true,
+		KeyF12:       true,
+		KeyRune:      true,
+	}
+
+	return valid[k]
+}

screen.go

@@ -1,4 +1,4 @@
-// Copyright 2015 The TCell Authors
+// Copyright 2016 The TCell Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -101,6 +101,12 @@ type Screen interface {
 	// DisableMouse disables the mouse.
 	DisableMouse()
 
+	// HasMouse returns true if the terminal (apparently) supports a
+	// mouse.  Note that the a return value of true doesn't guarantee that
+	// a mouse/pointing device is present; a false return definitely
+	// indicates no mouse support is available.
+	HasMouse() bool
+
 	// Colors returns the number of colors.  All colors are assumed to
 	// use the ANSI color map.  If a terminal is monochrome, it will
 	// return 0.
@@ -174,6 +180,16 @@ type Screen interface {
 	// ask a screen to resize, but it allows the Screen to implement
 	// the View interface.
 	Resize(int, int, int, int)
+
+	// HasKey returns true if the keyboard is believed to have the
+	// key.  In some cases a keyboard may have keys with this name
+	// but no support for them, while in others a key may be reported
+	// as supported but not actually be usable (such as some emulators
+	// that hijack certain keys).  Its best not to depend to strictly
+	// on this function, but it can be used for hinting when building
+	// menus, displayed hot-keys, etc.  Note that KeyRune (literal
+	// runes) is always true.
+	HasKey(Key) bool
 }
 
 // NewScreen returns a default Screen suitable for the user's terminal

simulation.go

@@ -1,4 +1,4 @@
-// Copyright 2015 The TCell Authors
+// Copyright 2016 The TCell Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -491,4 +491,12 @@ func (s *simscreen) CanDisplay(r rune, checkFallbacks bool) bool {
 	return false
 }
 
+func (s *simscreen) HasMouse() bool {
+	return false
+}
+
 func (s *simscreen) Resize(int, int, int, int) {}
+
+func (s *simscreen) HasKey(Key) bool {
+	return true
+}

tscreen.go

@@ -1,4 +1,4 @@
-// Copyright 2015 The TCell Authors
+// Copyright 2016 The TCell Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use file except in compliance with the License.
@@ -1133,4 +1133,18 @@ func (t *tScreen) CanDisplay(r rune, checkFallbacks bool) bool {
 	return false
 }
 
+func (t *tScreen) HasMouse() bool {
+	return len(t.mouse) != 0
+}
+
+func (t *tScreen) HasKey(k Key) bool {
+	if k == KeyRune {
+		return true
+	}
+	if _, exist := t.keys[k]; exist {
+		return true
+	}
+	return false
+}
+
 func (t *tScreen) Resize(int, int, int, int) {}