Package to open browser url from gio app

README.md

@@ -8,6 +8,7 @@ This table describes the current status of each package in `gioui.org/x`:
 
 | Name        | Purpose                                     | Intended for core? | Non-core dependencies? | API Stability |
 | ----------- | ------------------------------------------- | ------------------ | ---------------------- | ------------- |
+| browser     | Open browser url                            | no                 | yes                    | unstable      |
 | colorpicker | Widgets for choosing colors                 | uncertain          | no                     | unstable      |
 | component   | Material.io components                      | uncertain          | no                     | unstable      |
 | eventx      | Event management tools                      | yes                | no                     | unstable      |

browser/README.md

@@ -0,0 +1,9 @@
+## Open browser
+
+Cross platform open url for [Gio](https://gioui.org) applications.  
+
+## Usage
+
+```go
+browser.OpenUrl("https://gioui.org/")
+```

browser/browser_android.go

@@ -0,0 +1,38 @@
+//go:build android
+// +build android
+
+package browser
+
+/*
+#cgo LDFLAGS: -landroid
+
+#include <jni.h>
+#include <stdlib.h>
+*/
+
+import (
+	"gioui.org/app"
+	"git.wow.st/gmp/jni"
+)
+
+//go:generate javac -source 8 -target 8  -bootclasspath $ANDROID_HOME/platforms/android-30/android.jar -d $TEMP/browser_browser_android/classes browser_android.java
+//go:generate jar cf browser_android.jar -C $TEMP/browser_browser_android/classes .
+
+func OpenUrl(url string) error {
+	err := jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error {
+		class, err := jni.LoadClass(env, jni.ClassLoaderFor(env, jni.Object(app.AppContext())), "org/gioui/x/browser/browser_android")
+		if err != nil {
+			return err
+		}
+
+		methodId := jni.GetStaticMethodID(env, class, "openUrl", "(Landroid/content/Context;Ljava/lang/String;)V")
+		err = jni.CallStaticVoidMethod(env, class, methodId, jni.Value(app.AppContext()), jni.Value(jni.JavaString(env, url)))
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+
+	return err
+}

browser/browser_android.java

@@ -0,0 +1,14 @@
+package org.gioui.x.browser;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+
+public class browser_android {
+  public static void openUrl(Context context, String url) {
+    Uri webpage = Uri.parse(url);
+    Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
+    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+    context.startActivity(intent);
+  }
+}

browser/browser_darwin.go

@@ -0,0 +1,13 @@
+//go:build darwin
+// +build darwin
+
+package browser
+
+import (
+	"os/exec"
+)
+
+func OpenUrl(url string) error {
+	cmd := exec.Command("open", url)
+	return cmd.Run()
+}

browser/browser_ios.go

@@ -0,0 +1,32 @@
+//go:build ios
+// +build ios
+
+package browser
+
+/*
+#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
+extern static CFTypeRef newNSString(unichar *chars, NSUInteger length);
+extern static void openUrl(CFTypeRef str);
+*/
+
+import "C"
+import (
+	"unicode/utf16"
+	"unsafe"
+)
+
+func stringToNSString(str string) C.CFTypeRef {
+	u16 := utf16.Encode([]rune(str))
+	var chars *C.unichar
+	if len(u16) > 0 {
+		chars = (*C.unichar)(unsafe.Pointer(&u16[0]))
+	}
+	return C.newNSString(chars, C.NSUInteger(len(u16)))
+}
+
+func OpenUrl(url string) error {
+	cstr := stringToNSString(url)
+	defer C.CFRelease(cstr)
+	C.openUrl(cstr)
+	return nil
+}

browser/browser_ios.m

@@ -0,0 +1,22 @@
+#include <Foundation/Foundation.h>
+#include <UIKit/UIKit.h>
+#include <stdint.h>
+
+static CFTypeRef newNSString(unichar *chars, NSUInteger length) {
+	@autoreleasepool {
+		NSString *s = [NSString string];
+		if (length > 0) {
+			s = [NSString stringWithCharacters:chars length:length];
+		}
+		return CFBridgingRetain(s);
+	}
+}
+
+static void openUrl(CFTypeRef str) {
+	@autoreleasepool {
+		NSString *s = (__bridge NSString *)str;
+    NSURL *url = [NSURL URLWithString:s];
+    UIApplication *application = [UIApplication sharedApplication];
+    [application openURL:url options:@{} completionHandler:nil];
+	}
+}

browser/browser_js.go

@@ -0,0 +1,13 @@
+//go:build js
+// +build js
+
+package browser
+
+import (
+	"syscall/js"
+)
+
+func OpenUrl(url string) error {
+	js.Global().Call("open", url, "_blank", "")
+	return nil
+}

browser/browser_unix.go

@@ -0,0 +1,14 @@
+//go:build (linux && !android) || freebsd || openbsd
+// +build linux,!android freebsd openbsd
+
+package browser
+
+import (
+	"os/exec"
+)
+
+func OpenUrl(url string) error {
+	// xdg-open is part of the freedesktop.org suite and should be available on all distro
+	cmd := exec.Command("xdg-open", url)
+	return cmd.Run()
+}

browser/browser_windows.go

@@ -0,0 +1,13 @@
+//go:build windows
+// +build windows
+
+package browser
+
+import (
+	"os/exec"
+)
+
+func OpenUrl(url string) error {
+	cmd := exec.Command("cmd", "/c", "start", url)
+	return cmd.Run()
+}