io,app: add deeplinking support

app/GioActivity.java

@@ -4,6 +4,7 @@
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.content.Intent;
 import android.content.res.Configuration;
 import android.view.ViewGroup;
 import android.view.View;
@@ -29,6 +30,7 @@ public final class GioActivity extends Activity {
 
             layer.addView(view);
             setContentView(layer);
+            onNewIntent(this.getIntent());
 	}
 
 	@Override public void onDestroy() {
@@ -60,4 +62,9 @@ public final class GioActivity extends Activity {
 		if (!view.backPressed())
 			super.onBackPressed();
 	}
+
+	@Override protected void onNewIntent(Intent intent) {
+		super.onNewIntent(intent);
+		view.onIntentEvent(intent);
+	}
 }

app/GioView.java

@@ -12,6 +12,7 @@
 import android.app.FragmentManager;
 import android.app.FragmentTransaction;
 import android.content.Context;
+import android.content.Intent;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Matrix;
@@ -311,6 +312,15 @@ private void setHighRefreshRate() {
 		window.setAttributes(layoutParams);
 	}
 
+	protected void onIntentEvent(Intent intent) {
+		if (intent == null) {
+			return;
+		}
+		if (intent.getData() != null) {
+			this.onOpenURI(nhandle, intent.getData().toString());
+		}
+	}
+
 	@Override protected boolean dispatchHoverEvent(MotionEvent event) {
 		if (!accessManager.isTouchExplorationEnabled()) {
 			return super.dispatchHoverEvent(event);
@@ -549,6 +559,7 @@ void updateCaret(float m00, float m01, float m02, float m10, float m11, float m1
 	static private native void onExitTouchExploration(long handle);
 	static private native void onA11yFocus(long handle, int viewId);
 	static private native void onClearA11yFocus(long handle, int viewId);
+	static private native void onOpenURI(long handle, String uri);
 	static private native void imeSetSnippet(long handle, int start, int end);
 	static private native String imeSnippet(long handle);
 	static private native int imeSnippetStart(long handle);

app/framework_ios.h

@@ -3,4 +3,5 @@
 #include <UIKit/UIKit.h>
 
 @interface GioViewController : UIViewController
+- (BOOL)onOpenURI:(NSString *)url;
 @end

app/internal/windows/windows.go

@@ -108,6 +108,12 @@ type MonitorInfo struct {
 	Flags    uint32
 }
 
+type CopyDataStruct struct {
+	DwData uintptr
+	CbData uint32
+	LpData uintptr
+}
+
 const (
 	TRUE = 1
 
@@ -247,6 +253,7 @@ const (
 	WM_CANCELMODE           = 0x001F
 	WM_CHAR                 = 0x0102
 	WM_CLOSE                = 0x0010
+	WM_COPYDATA             = 0x004A
 	WM_CREATE               = 0x0001
 	WM_DPICHANGED           = 0x02E0
 	WM_DESTROY              = 0x0002
@@ -344,6 +351,7 @@ var (
 	_DefWindowProc               = user32.NewProc("DefWindowProcW")
 	_DestroyWindow               = user32.NewProc("DestroyWindow")
 	_DispatchMessage             = user32.NewProc("DispatchMessageW")
+	_FindWindow                  = user32.NewProc("FindWindowW")
 	_EmptyClipboard              = user32.NewProc("EmptyClipboard")
 	_GetWindowRect               = user32.NewProc("GetWindowRect")
 	_GetClientRect               = user32.NewProc("GetClientRect")
@@ -374,6 +382,7 @@ var (
 	_ReleaseDC                   = user32.NewProc("ReleaseDC")
 	_ScreenToClient              = user32.NewProc("ScreenToClient")
 	_ShowWindow                  = user32.NewProc("ShowWindow")
+	_SendMessage                 = user32.NewProc("SendMessageW")
 	_SetCapture                  = user32.NewProc("SetCapture")
 	_SetCursor                   = user32.NewProc("SetCursor")
 	_SetClipboardData            = user32.NewProc("SetClipboardData")
@@ -473,6 +482,14 @@ func EmptyClipboard() error {
 	return nil
 }
 
+func FindWindow(lpClassName string) (syscall.Handle, error) {
+	hwnd, _, err := _FindWindow.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpClassName))), 0)
+	if hwnd == 0 {
+		return 0, fmt.Errorf("FindWindow failed: %v", err)
+	}
+	return syscall.Handle(hwnd), nil
+}
+
 func GetWindowRect(hwnd syscall.Handle) Rect {
 	var r Rect
 	_GetWindowRect.Call(uintptr(hwnd), uintptr(unsafe.Pointer(&r)))
@@ -780,6 +797,14 @@ func ReleaseDC(hdc syscall.Handle) {
 	_ReleaseDC.Call(uintptr(hdc))
 }
 
+func SendMessage(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) error {
+	r, _, err := _SendMessage.Call(uintptr(hwnd), uintptr(msg), wParam, lParam)
+	if r == 0 {
+		return fmt.Errorf("SendMessage failed: %v", err)
+	}
+	return nil
+}
+
 func SetForegroundWindow(hwnd syscall.Handle) {
 	_SetForegroundWindow.Call(uintptr(hwnd))
 }

app/os_android.go

@@ -121,10 +121,12 @@ import "C"
 import (
 	"errors"
 	"fmt"
+	"gioui.org/io/transfer"
 	"image"
 	"image/color"
 	"io"
 	"math"
+	"net/url"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -146,7 +148,6 @@ import (
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
-	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -667,6 +668,16 @@ func Java_org_gioui_GioView_onClearA11yFocus(env *C.JNIEnv, class C.jclass, view
 	}
 }
 
+//export Java_org_gioui_GioView_onOpenURI
+func Java_org_gioui_GioView_onOpenURI(env *C.JNIEnv, class C.jclass, view C.jlong, uri C.jstring) {
+	w := cgo.Handle(view).Value().(*window)
+	u, err := url.Parse(goString(env, uri))
+	if err != nil {
+		return
+	}
+	w.ProcessEvent(transfer.URLEvent{URL: u})
+}
+
 func (w *window) ProcessEvent(e event.Event) {
 	w.processEvent(e)
 }

app/os_ios.go

@@ -82,6 +82,7 @@ import "C"
 import (
 	"image"
 	"io"
+	"net/url"
 	"os"
 	"runtime"
 	"runtime/cgo"
@@ -121,6 +122,13 @@ type window struct {
 
 var mainWindow = newWindowRendezvous()
 
+// activeViews is the list of active views.
+var activeViews = make([]*window, 0, 1)
+
+// startupURI is the URI to open when the first window is created,
+// but no window is active yet.
+var startupURI *url.URL
+
 func init() {
 	// Darwin requires UI operations happen on the main thread only.
 	runtime.LockOSThread()
@@ -145,8 +153,13 @@ func onCreate(view, controller C.CFTypeRef) {
 	}
 	w.displayLink = dl
 	C.gio_viewSetHandle(view, C.uintptr_t(cgo.NewHandle(w)))
+	activeViews = append(activeViews, w)
 	w.Configure(wopts.options)
 	w.ProcessEvent(UIKitViewEvent{ViewController: uintptr(controller)})
+	if startupURI != nil {
+		w.ProcessEvent(transfer.URLEvent{URL: startupURI})
+		startupURI = nil
+	}
 }
 
 func viewFor(h C.uintptr_t) *window {
@@ -213,6 +226,12 @@ func onDestroy(h C.uintptr_t) {
 	w.displayLink.Close()
 	w.displayLink = nil
 	cgo.Handle(h).Delete()
+	for i, v := range activeViews {
+		if v == w {
+			activeViews = append(activeViews[:i], activeViews[i+1:]...)
+			break
+		}
+	}
 	w.view = 0
 }
 
@@ -425,6 +444,21 @@ func osMain() {
 	}
 }
 
+//export gio_onOpenURI
+func gio_onOpenURI(uri C.CFTypeRef) {
+	u, err := url.Parse(nsstringToString(uri))
+	if err != nil {
+		return
+	}
+	if len(activeViews) == 0 {
+		startupURI = u
+		return
+	}
+	for _, w := range activeViews {
+		w.ProcessEvent(transfer.URLEvent{URL: u})
+	}
+}
+
 //export gio_runMain
 func gio_runMain() {
 	if !isMainThread() {

app/os_ios.m

@@ -103,6 +103,11 @@ - (void)keyboardWillHide:(NSNotification *)note {
 	_keyboardHeight = 0.0;
 	[self.view setNeedsLayout];
 }
+
+- (BOOL)onOpenURI:(NSString *)url {
+    gio_onOpenURI((__bridge CFTypeRef)url);
+    return YES;
+}
 #endif
 @end
 
@@ -283,16 +288,20 @@ void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle) {
 
 @interface _gioAppDelegate : UIResponder <UIApplicationDelegate>
 @property (strong, nonatomic) UIWindow *window;
+@property (strong, nonatomic) GioViewController *controller;
 @end
 
 @implementation _gioAppDelegate
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
-	GioViewController *controller = [[GioViewController alloc] initWithNibName:nil bundle:nil];
-	self.window.rootViewController = controller;
+	self.controller = [[GioViewController alloc] initWithNibName:nil bundle:nil];
+	self.window.rootViewController = self.controller;
 	[self.window makeKeyAndVisible];
 	return YES;
 }
+- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options {
+	return [self.controller onOpenURI:url.absoluteString];
+}
 @end
 
 int gio_applicationMain(int argc, char *argv[]) {

app/os_macos.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"image"
 	"io"
+	"net/url"
 	"runtime"
 	"runtime/cgo"
 	"strings"
@@ -334,6 +335,14 @@ type window struct {
 // launched is closed when applicationDidFinishLaunching is called.
 var launched = make(chan struct{})
 
+// activeViews is the list of active windows.
+var activeViews = make([]*window, 0, 1)
+
+// startupURI is the URL event that was received before the app was launched.
+// Since the app is not running yet, the URL event is stored and processed after
+// the view is created.
+var startupURI *url.URL
+
 // nextTopLeft is the offset to use for the next window's call to
 // cascadeTopLeftFromPoint.
 var nextTopLeft C.NSPoint
@@ -865,6 +874,10 @@ func gio_onAttached(h C.uintptr_t, attached C.int) {
 	if attached != 0 {
 		layer := C.layerForView(w.view)
 		w.ProcessEvent(AppKitViewEvent{View: uintptr(w.view), Layer: uintptr(layer)})
+		if startupURI != nil {
+			w.ProcessEvent(transfer.URLEvent{URL: startupURI})
+			startupURI = nil
+		}
 	} else {
 		w.ProcessEvent(AppKitViewEvent{})
 		w.visible = false
@@ -879,6 +892,12 @@ func gio_onDestroy(h C.uintptr_t) {
 	w.displayLink.Close()
 	w.displayLink = nil
 	cgo.Handle(h).Delete()
+	for i, win := range activeViews {
+		if win == w {
+			activeViews = append(activeViews[:i], activeViews[i+1:]...)
+			break
+		}
+	}
 	w.view = 0
 }
 
@@ -914,6 +933,23 @@ func gio_onFinishLaunching() {
 	close(launched)
 }
 
+//export gio_onOpenURI
+func gio_onOpenURI(uri C.CFTypeRef) {
+	u, err := url.Parse(nsstringToString(uri))
+	if err != nil {
+		return
+	}
+
+	if len(activeViews) == 0 {
+		startupURI = u
+		return
+	}
+
+	for _, w := range activeViews {
+		w.ProcessEvent(transfer.URLEvent{URL: u})
+	}
+}
+
 func newWindow(win *callbacks, options []Option) {
 	<-launched
 	res := make(chan struct{})
@@ -971,6 +1007,7 @@ func (w *window) init() error {
 		return err
 	}
 	C.gio_viewSetHandle(view, C.uintptr_t(cgo.NewHandle(w)))
+	activeViews = append(activeViews, w)
 	w.view = view
 	return nil
 }

app/os_macos.m

@@ -395,6 +395,7 @@ CFTypeRef gio_createView(void) {
 												 selector:@selector(applicationDidHide:)
 													 name:NSApplicationDidHideNotification
 												   object:nil];
+
 		return CFBridgingRetain(view);
 	}
 }
@@ -412,6 +413,11 @@ - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
 	[NSApp activateIgnoringOtherApps:YES];
 	gio_onFinishLaunching();
 }
+- (void)application:(NSApplication *)application openURLs:(NSArray<NSURL *> *)urls {
+	for (NSURL *url in urls) {
+		gio_onOpenURI((__bridge CFTypeRef)url.absoluteString);
+	}
+}
 @end
 
 void gio_main() {