type Event struct {
	// WidthPx and HeightPx are the window's dimensions in pixels.
	WidthPx, HeightPx int

	// WidthPt and HeightPt are the window's physical dimensions in points
	// (1/72 of an inch).
	//
	// The values are based on PixelsPerPt and are therefore approximate, as
	// per the comment on PixelsPerPt.
	WidthPt, HeightPt geom.Pt

	// PixelsPerPt is the window's physical resolution. It is the number of
	// pixels in a single geom.Pt, from the golang.org/x/mobile/geom package.
	//
	// There are a wide variety of pixel densities in existing phones and
	// tablets, so apps should be written to expect various non-integer
	// PixelsPerPt values. In general, work in geom.Pt.
	//
	// The value is approximate, in that the OS, drivers or hardware may report
	// approximate or quantized values. An N x N pixel square should be roughly
	// 1 square inch for N = int(PixelsPerPt * 72), although different square
	// lengths (in pixels) might be closer to 1 inch in practice. Nonetheless,
	// this PixelsPerPt value should be consistent with e.g. the ratio of
	// WidthPx to WidthPt.
	PixelsPerPt float32

	// Orientation is the orientation of the device screen.
	Orientation Orientation
}

type Orientation int

const (
	// OrientationUnknown means device orientation cannot be determined.
	//
	// Equivalent on Android to Configuration.ORIENTATION_UNKNOWN
	// and on iOS to:
	//	UIDeviceOrientationUnknown
	//	UIDeviceOrientationFaceUp
	//	UIDeviceOrientationFaceDown
	OrientationUnknown Orientation = iota

	// OrientationPortrait is a device oriented so it is tall and thin.
	//
	// Equivalent on Android to Configuration.ORIENTATION_PORTRAIT
	// and on iOS to:
	//	UIDeviceOrientationPortrait
	//	UIDeviceOrientationPortraitUpsideDown
	OrientationPortrait

	// OrientationLandscape is a device oriented so it is short and wide.
	//
	// Equivalent on Android to Configuration.ORIENTATION_LANDSCAPE
	// and on iOS to:
	//	UIDeviceOrientationLandscapeLeft
	//	UIDeviceOrientationLandscapeRight
	OrientationLandscape
)