diff --git a/app/internal/window/GioView.java b/app/internal/window/GioView.java
index 521e82bc..82bc36f3 100644
--- a/app/internal/window/GioView.java
+++ b/app/internal/window/GioView.java
@@ -106,6 +106,7 @@ public class GioView extends SurfaceView implements Choreographer.FrameCallback
 						event.getToolType(i),
 						event.getHistoricalX(i, j),
 						event.getHistoricalY(i, j),
+						event.getButtonState(),
 						time);
 			}
 		}
@@ -123,6 +124,7 @@ public class GioView extends SurfaceView implements Choreographer.FrameCallback
 					event.getToolType(i),
 					event.getX(i),
 					event.getY(i),
+					event.getButtonState(),
 					event.getEventTime());
 		}
 		return true;
@@ -214,7 +216,7 @@ public class GioView extends SurfaceView implements Choreographer.FrameCallback
 	static private native void onConfigurationChanged(long handle);
 	static private native void onWindowInsets(long handle, int top, int right, int bottom, int left);
 	static private native void onLowMemory();
-	static private native void onTouchEvent(long handle, int action, int pointerID, int tool, float x, float y, long time);
+	static private native void onTouchEvent(long handle, int action, int pointerID, int tool, float x, float y, int buttons, long time);
 	static private native void onKeyEvent(long handle, int code, int character, long time);
 	static private native void onFrameCallback(long handle, long nanos);
 	static private native boolean onBack(long handle);
diff --git a/app/internal/window/gl_macos.m b/app/internal/window/gl_macos.m
index abdb406b..fdadae2b 100644
--- a/app/internal/window/gl_macos.m
+++ b/app/internal/window/gl_macos.m
@@ -18,7 +18,7 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 		dx *= 10;
 		dy *= 10;
 	}
-	gio_onMouse((__bridge CFTypeRef)view, typ, p.x, p.y, dx, dy, [event timestamp]);
+	gio_onMouse((__bridge CFTypeRef)view, typ, [NSEvent pressedMouseButtons], p.x, p.y, dx, dy, [event timestamp]);
 }
 
 static CVReturn displayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp *inNow, const CVTimeStamp *inOutputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *displayLinkContext) {
@@ -79,6 +79,18 @@ CVDisplayLinkRef displayLink;
 - (void)mouseUp:(NSEvent *)event {
 	handleMouse(self, event, GIO_MOUSE_UP, 0, 0);
 }
+- (void)middleMouseDown:(NSEvent *)event {
+	handleMouse(self, event, GIO_MOUSE_DOWN, 0, 0);
+}
+- (void)middletMouseUp:(NSEvent *)event {
+	handleMouse(self, event, GIO_MOUSE_UP, 0, 0);
+}
+- (void)rightMouseDown:(NSEvent *)event {
+	handleMouse(self, event, GIO_MOUSE_DOWN, 0, 0);
+}
+- (void)rightMouseUp:(NSEvent *)event {
+	handleMouse(self, event, GIO_MOUSE_UP, 0, 0);
+}
 - (void)mouseMoved:(NSEvent *)event {
 	handleMouse(self, event, GIO_MOUSE_MOVE, 0, 0);
 }
diff --git a/app/internal/window/os_android.c b/app/internal/window/os_android.c
index f8d25b6e..5150ab65 100644
--- a/app/internal/window/os_android.c
+++ b/app/internal/window/os_android.c
@@ -72,7 +72,7 @@ JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved) {
 		},
 		{
 			.name = "onTouchEvent",
-			.signature = "(JIIIFFJ)V",
+			.signature = "(JIIIFFIJ)V",
 			.fnPtr = onTouchEvent
 		},
 		{
diff --git a/app/internal/window/os_android.go b/app/internal/window/os_android.go
index b2062dae..5cce88d5 100644
--- a/app/internal/window/os_android.go
+++ b/app/internal/window/os_android.go
@@ -386,7 +386,7 @@ func onKeyEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, keyCode, r C.jint
 }
 
 //export onTouchEvent
-func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointerID, tool C.jint, x, y C.jfloat, t C.jlong) {
+func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointerID, tool C.jint, x, y C.jfloat, jbtns C.jint, t C.jlong) {
 	w := views[handle]
 	var typ pointer.Type
 	switch action {
@@ -402,6 +402,16 @@ func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointer
 		return
 	}
 	var src pointer.Source
+	var btns pointer.Buttons
+	if jbtns&C.AMOTION_EVENT_BUTTON_PRIMARY != 0 {
+		btns |= pointer.ButtonLeft
+	}
+	if jbtns&C.AMOTION_EVENT_BUTTON_SECONDARY != 0 {
+		btns |= pointer.ButtonRight
+	}
+	if jbtns&C.AMOTION_EVENT_BUTTON_TERTIARY != 0 {
+		btns |= pointer.ButtonMiddle
+	}
 	switch tool {
 	case C.AMOTION_EVENT_TOOL_TYPE_FINGER:
 		src = pointer.Touch
@@ -413,6 +423,7 @@ func onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointer
 	w.callbacks.Event(pointer.Event{
 		Type:      typ,
 		Source:    src,
+		Buttons:   btns,
 		PointerID: pointer.ID(pointerID),
 		Time:      time.Duration(t) * time.Millisecond,
 		Position:  f32.Point{X: float32(x), Y: float32(y)},
diff --git a/app/internal/window/os_js.go b/app/internal/window/os_js.go
index a8900fc0..1644be4c 100644
--- a/app/internal/window/os_js.go
+++ b/app/internal/window/os_js.go
@@ -282,9 +282,21 @@ func (w *window) pointerEvent(typ pointer.Type, dx, dy float32, e js.Value) {
 		Y: dy * scale,
 	}
 	t := time.Duration(e.Get("timeStamp").Int()) * time.Millisecond
+	jbtns := e.Get("buttons").Int()
+	var btns pointer.Buttons
+	if jbtns&1 != 0 {
+		btns |= pointer.ButtonLeft
+	}
+	if jbtns&2 != 0 {
+		btns |= pointer.ButtonRight
+	}
+	if jbtns&4 != 0 {
+		btns |= pointer.ButtonMiddle
+	}
 	w.w.Event(pointer.Event{
 		Type:     typ,
 		Source:   pointer.Mouse,
+		Buttons:  btns,
 		Position: pos,
 		Scroll:   scroll,
 		Time:     t,
diff --git a/app/internal/window/os_macos.go b/app/internal/window/os_macos.go
index ed62ab57..018bf642 100644
--- a/app/internal/window/os_macos.go
+++ b/app/internal/window/os_macos.go
@@ -151,7 +151,7 @@ func gio_onText(view C.CFTypeRef, cstr *C.char) {
 }
 
 //export gio_onMouse
-func gio_onMouse(view C.CFTypeRef, cdir C.int, x, y, dx, dy C.CGFloat, ti C.double) {
+func gio_onMouse(view C.CFTypeRef, cdir C.int, cbtns C.NSUInteger, x, y, dx, dy C.CGFloat, ti C.double) {
 	var typ pointer.Type
 	switch cdir {
 	case C.GIO_MOUSE_MOVE:
@@ -163,6 +163,16 @@ func gio_onMouse(view C.CFTypeRef, cdir C.int, x, y, dx, dy C.CGFloat, ti C.doub
 	default:
 		panic("invalid direction")
 	}
+	var btns pointer.Buttons
+	if cbtns&(1<<0) != 0 {
+		btns |= pointer.ButtonLeft
+	}
+	if cbtns&(1<<1) != 0 {
+		btns |= pointer.ButtonRight
+	}
+	if cbtns&(1<<2) != 0 {
+		btns |= pointer.ButtonMiddle
+	}
 	t := time.Duration(float64(ti)*float64(time.Second) + .5)
 	viewDo(view, func(views viewMap, view C.CFTypeRef) {
 		w := views[view]
@@ -172,6 +182,7 @@ func gio_onMouse(view C.CFTypeRef, cdir C.int, x, y, dx, dy C.CGFloat, ti C.doub
 			Type:     typ,
 			Source:   pointer.Mouse,
 			Time:     t,
+			Buttons:  btns,
 			Position: f32.Point{X: x, Y: y},
 			Scroll:   f32.Point{X: dx, Y: dy},
 		})
diff --git a/app/internal/window/os_wayland.go b/app/internal/window/os_wayland.go
index ed362464..1ed9d43d 100644
--- a/app/internal/window/os_wayland.go
+++ b/app/internal/window/os_wayland.go
@@ -106,8 +106,9 @@ type window struct {
 		steps image.Point
 		dist  f32.Point
 	}
-	lastPos   f32.Point
-	lastTouch f32.Point
+	pointerBtns pointer.Buttons
+	lastPos     f32.Point
+	lastTouch   f32.Point
 
 	fling struct {
 		yExtrapolation fling.Extrapolation
@@ -514,18 +515,32 @@ func gio_onPointerMotion(data unsafe.Pointer, p *C.struct_wl_pointer, t C.uint32
 }
 
 //export gio_onPointerButton
-func gio_onPointerButton(data unsafe.Pointer, p *C.struct_wl_pointer, serial, t, button, state C.uint32_t) {
+func gio_onPointerButton(data unsafe.Pointer, p *C.struct_wl_pointer, serial, t, wbtn, state C.uint32_t) {
 	w := winMap[p]
 	// From linux-event-codes.h.
-	const BTN_LEFT = 0x110
-	if button != BTN_LEFT {
+	const (
+		BTN_LEFT   = 0x110
+		BTN_RIGHT  = 0x111
+		BTN_MIDDLE = 0x112
+	)
+	var btn pointer.Buttons
+	switch wbtn {
+	case BTN_LEFT:
+		btn = pointer.ButtonLeft
+	case BTN_RIGHT:
+		btn = pointer.ButtonRight
+	case BTN_MIDDLE:
+		btn = pointer.ButtonMiddle
+	default:
 		return
 	}
 	var typ pointer.Type
 	switch state {
 	case 0:
+		w.pointerBtns &^= btn
 		typ = pointer.Release
 	case 1:
+		w.pointerBtns |= btn
 		typ = pointer.Press
 	}
 	w.flushScroll()
@@ -533,6 +548,7 @@ func gio_onPointerButton(data unsafe.Pointer, p *C.struct_wl_pointer, serial, t,
 	w.w.Event(pointer.Event{
 		Type:     typ,
 		Source:   pointer.Mouse,
+		Buttons:  w.pointerBtns,
 		Position: w.lastPos,
 		Time:     time.Duration(t) * time.Millisecond,
 	})
@@ -908,6 +924,7 @@ func (w *window) flushScroll() {
 	w.w.Event(pointer.Event{
 		Type:     pointer.Move,
 		Source:   pointer.Mouse,
+		Buttons:  w.pointerBtns,
 		Position: w.lastPos,
 		Scroll:   total,
 		Time:     w.scroll.time,
@@ -929,6 +946,7 @@ func (w *window) onPointerMotion(x, y C.wl_fixed_t, t C.uint32_t) {
 	w.w.Event(pointer.Event{
 		Type:     pointer.Move,
 		Position: w.lastPos,
+		Buttons:  w.pointerBtns,
 		Source:   pointer.Mouse,
 		Time:     time.Duration(t) * time.Millisecond,
 	})
diff --git a/app/internal/window/os_windows.go b/app/internal/window/os_windows.go
index a12070b8..5bbc2863 100644
--- a/app/internal/window/os_windows.go
+++ b/app/internal/window/os_windows.go
@@ -56,13 +56,14 @@ type point struct {
 }
 
 type window struct {
-	hwnd   syscall.Handle
-	hdc    syscall.Handle
-	w      Callbacks
-	width  int
-	height int
-	stage  system.Stage
-	dead   bool
+	hwnd        syscall.Handle
+	hdc         syscall.Handle
+	w           Callbacks
+	width       int
+	height      int
+	stage       system.Stage
+	dead        bool
+	pointerBtns pointer.Buttons
 
 	mu        sync.Mutex
 	animating bool
@@ -139,6 +140,8 @@ const (
 	_WM_KEYUP       = 0x0101
 	_WM_LBUTTONDOWN = 0x0201
 	_WM_LBUTTONUP   = 0x0202
+	_WM_MBUTTONDOWN                  =0x0207
+	_WM_MBUTTONUP                    =0x0208
 	_WM_MOUSEMOVE   = 0x0200
 	_WM_MOUSEWHEEL  = 0x020A
 	_WM_PAINT       = 0x000F
@@ -148,6 +151,8 @@ const (
 	_WM_SHOWWINDOW  = 0x0018
 	_WM_SIZE        = 0x0005
 	_WM_SYSKEYDOWN  = 0x0104
+	_WM_RBUTTONDOWN                  =0x0204
+	_WM_RBUTTONUP = 0x0205
 	_WM_TIMER       = 0x0113
 	_WM_UNICHAR     = 0x0109
 	_WM_USER        = 0x0400
@@ -313,15 +318,17 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 			w.w.Event(cmd)
 		}
 	case _WM_LBUTTONDOWN:
-		setCapture(w.hwnd)
-		x, y := coordsFromlParam(lParam)
-		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.Event(pointer.Event{
-			Type:     pointer.Press,
-			Source:   pointer.Mouse,
-			Position: p,
-			Time:     getMessageTime(),
-		})
+		w.pointerButton(pointer.ButtonLeft, true, lParam)
+	case _WM_LBUTTONUP:
+		w.pointerButton(pointer.ButtonLeft, false, lParam)
+	case _WM_RBUTTONDOWN:
+		w.pointerButton(pointer.ButtonRight, true, lParam)
+	case _WM_RBUTTONUP:
+		w.pointerButton(pointer.ButtonRight, false, lParam)
+	case _WM_MBUTTONDOWN:
+		w.pointerButton(pointer.ButtonMiddle, true, lParam)
+	case _WM_MBUTTONUP:
+		w.pointerButton(pointer.ButtonMiddle, false, lParam)
 	case _WM_CANCELMODE:
 		w.w.Event(pointer.Event{
 			Type: pointer.Cancel,
@@ -330,16 +337,6 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 		w.w.Event(key.FocusEvent{Focus: true})
 	case _WM_KILLFOCUS:
 		w.w.Event(key.FocusEvent{Focus: false})
-	case _WM_LBUTTONUP:
-		releaseCapture()
-		x, y := coordsFromlParam(lParam)
-		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.Event(pointer.Event{
-			Type:     pointer.Release,
-			Source:   pointer.Mouse,
-			Position: p,
-			Time:     getMessageTime(),
-		})
 	case _WM_MOUSEMOVE:
 		x, y := coordsFromlParam(lParam)
 		p := f32.Point{X: float32(x), Y: float32(y)}
@@ -367,6 +364,32 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 	return defWindowProc(hwnd, msg, wParam, lParam)
 }
 
+func (w *window) pointerButton(btn pointer.Buttons, press bool, lParam uintptr) {
+	var typ pointer.Type
+	if press {
+		typ = pointer.Press
+		if w.pointerBtns == 0 {
+			setCapture(w.hwnd)
+		}
+		w.pointerBtns |= btn
+	} else {
+		typ = pointer.Release
+		w.pointerBtns &^= btn
+		if w.pointerBtns == 0 {
+			releaseCapture()
+		}
+	}
+	x, y := coordsFromlParam(lParam)
+	p := f32.Point{X: float32(x), Y: float32(y)}
+	w.w.Event(pointer.Event{
+		Type:     typ,
+		Source:   pointer.Mouse,
+		Position: p,
+		Buttons:  w.pointerBtns,
+		Time:     getMessageTime(),
+	})
+}
+
 func coordsFromlParam(lParam uintptr) (int, int) {
 	x := int(int16(lParam & 0xffff))
 	y := int(int16((lParam >> 16) & 0xffff))
diff --git a/gesture/gesture.go b/gesture/gesture.go
index 9449825d..6d264567 100644
--- a/gesture/gesture.go
+++ b/gesture/gesture.go
@@ -128,6 +128,9 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 			if c.state == StatePressed || !e.Hit {
 				break
 			}
+			if e.Source == pointer.Mouse && e.Buttons != pointer.ButtonLeft {
+				break
+			}
 			c.state = StatePressed
 			events = append(events, ClickEvent{Type: TypePress, Position: e.Position, Source: e.Source})
 		case pointer.Move:
diff --git a/io/pointer/pointer.go b/io/pointer/pointer.go
index 095a1f58..1dcde674 100644
--- a/io/pointer/pointer.go
+++ b/io/pointer/pointer.go
@@ -5,6 +5,7 @@ package pointer
 import (
 	"encoding/binary"
 	"image"
+	"strings"
 	"time"
 
 	"gioui.org/f32"
@@ -27,6 +28,8 @@ type Event struct {
 	// Time is when the event was received. The
 	// timestamp is relative to an undefined base.
 	Time time.Duration
+	// Buttons are the set of pressed mouse buttons for this event.
+	Buttons Buttons
 	// Hit is set when the event was within the registered
 	// area for the handler. Hit can be false when a pointer
 	// was pressed within the hit area, and then dragged
@@ -86,6 +89,9 @@ type Priority uint8
 // Source of an Event.
 type Source uint8
 
+// Buttons is a set of mouse buttons
+type Buttons uint8
+
 // Must match app/internal/input.areaKind
 type areaKind uint8
 
@@ -116,6 +122,12 @@ const (
 	Grabbed
 )
 
+const (
+	ButtonLeft Buttons = 1 << iota
+	ButtonRight
+	ButtonMiddle
+)
+
 const (
 	areaRect areaKind = iota
 	areaEllipse
@@ -199,4 +211,24 @@ func (s Source) String() string {
 	}
 }
 
+// Contain reports whether the set b contains
+// all of the buttons.
+func (b Buttons) Contain(buttons Buttons) bool {
+	return b&buttons == buttons
+}
+
+func (b Buttons) String() string {
+	var strs []string
+	if b.Contain(ButtonLeft) {
+		strs = append(strs, "ButtonLeft")
+	}
+	if b.Contain(ButtonRight) {
+		strs = append(strs, "ButtonRight")
+	}
+	if b.Contain(ButtonMiddle) {
+		strs = append(strs, "ButtonMiddle")
+	}
+	return strings.Join(strs, "|")
+}
+
 func (Event) ImplementsEvent() {}