add window focus event to gui module

1 files changed, 93 insertions, 0 deletions

diff --git a/gui/win/events.go b/gui/win/events.go
new file mode 100644
index 0000000..bae8017
--- /dev/null
+++ b/gui/win/events.go
@@ -0,0 +1,93 @@
+package win
+
+import (
+	"fmt"
+	"image"
+)
+
+// Button indicates a mouse button in an event.
+type Button string
+
+// List of all mouse buttons.
+const (
+	ButtonLeft   Button = "left"
+	ButtonRight  Button = "right"
+	ButtonMiddle Button = "middle"
+)
+
+// Key indicates a keyboard key in an event.
+type Key string
+
+// List of all keyboard keys.
+const (
+	KeyLeft      Key = "left"
+	KeyRight     Key = "right"
+	KeyUp        Key = "up"
+	KeyDown      Key = "down"
+	KeyEscape    Key = "escape"
+	KeySpace     Key = "space"
+	KeyBackspace Key = "backspace"
+	KeyDelete    Key = "delete"
+	KeyEnter     Key = "enter"
+	KeyTab       Key = "tab"
+	KeyHome      Key = "home"
+	KeyEnd       Key = "end"
+	KeyPageUp    Key = "pageup"
+	KeyPageDown  Key = "pagedown"
+	KeyShift     Key = "shift"
+	KeyCtrl      Key = "ctrl"
+	KeyAlt       Key = "alt"
+)
+
+type (
+	// WiClose is an event that happens when the user presses the close button on the window.
+	WiClose struct{}
+
+	// WiFocus is an event that happens when the window gains or loses focus.
+	WiFocus struct{ Focused bool }
+
+	// MoMove is an event that happens when the mouse gets moved across the window.
+	MoMove struct{ image.Point }
+
+	// MoDown is an event that happens when a mouse button gets pressed.
+	MoDown struct {
+		image.Point
+		Button Button
+	}
+
+	// MoUp is an event that happens when a mouse button gets released.
+	MoUp struct {
+		image.Point
+		Button Button
+	}
+
+	// MoScroll is an event that happens on scrolling the mouse.
+	//
+	// The Point field tells the amount scrolled in each direction.
+	MoScroll struct{ image.Point }
+
+	// KbType is an event that happens when a Unicode character gets typed on the keyboard.
+	KbType struct{ Rune rune }
+
+	// KbDown is an event that happens when a key on the keyboard gets pressed.
+	KbDown struct{ Key Key }
+
+	// KbUp is an event that happens when a key on the keyboard gets released.
+	KbUp struct{ Key Key }
+
+	// KbRepeat is an event that happens when a key on the keyboard gets repeated.
+	//
+	// This happens when its held down for some time.
+	KbRepeat struct{ Key Key }
+)
+
+func (wc WiClose) String() string  { return "wi/close" }
+func (wf WiFocus) String() string  { return "wi/focus" }
+func (mm MoMove) String() string   { return fmt.Sprintf("mo/move/%d/%d", mm.X, mm.Y) }
+func (md MoDown) String() string   { return fmt.Sprintf("mo/down/%d/%d/%s", md.X, md.Y, md.Button) }
+func (mu MoUp) String() string     { return fmt.Sprintf("mo/up/%d/%d/%s", mu.X, mu.Y, mu.Button) }
+func (ms MoScroll) String() string { return fmt.Sprintf("mo/scroll/%d/%d", ms.X, ms.Y) }
+func (kt KbType) String() string   { return fmt.Sprintf("kb/type/%d", kt.Rune) }
+func (kd KbDown) String() string   { return fmt.Sprintf("kb/down/%s", kd.Key) }
+func (ku KbUp) String() string     { return fmt.Sprintf("kb/up/%s", ku.Key) }
+func (kr KbRepeat) String() string { return fmt.Sprintf("kb/repeat/%s", kr.Key) }