Add initial implementation for system navigator pop event

Author: GeertJohan

application.go

@@ -36,13 +36,15 @@ func NewApplication(opt ...Option) *Application {
 		config: defaultApplicationConfig,
 	}
 
-	// The platformPlugin and textinputPlugin are currently hardcoded as we have
-	// a hard link with GLFW. The plugins must be singleton and are accessed
-	// directly from the flutter package to wire up with glfw. If there's going
-	// to be a renderer interface, it's init would replace this configuration.
+	// The platformPlugin, textinputPlugin, etc. are currently hardcoded as we
+	// have a hard link with GLFW. The plugins must be singleton and are
+	// accessed directly from the flutter package to wire up with glfw. If
+	// there's going to be a renderer interface, it's init would replace this
+	// configuration.
 	opt = append(opt, AddPlugin(defaultNavigationPlugin))
 	opt = append(opt, AddPlugin(defaultPlatformPlugin))
 	opt = append(opt, AddPlugin(defaultTextinputPlugin))
+	opt = append(opt, AddPlugin(defaultLifecyclePlugin))
 
 	// apply all configs
 	for _, o := range opt {
@@ -180,6 +182,8 @@ func (a *Application) Run() error {
 	a.window.SetKeyCallback(defaultTextinputPlugin.glfwKeyCallback)
 	a.window.SetCharCallback(defaultTextinputPlugin.glfwCharCallback)
 
+	a.window.SetIconifyCallback(defaultLifecyclePlugin.glfwIconifyCallback)
+
 	a.window.SetCursorEnterCallback(m.glfwCursorEnterCallback)
 	a.window.SetCursorPosCallback(m.glfwCursorPosCallback)
 	a.window.SetMouseButtonCallback(m.glfwMouseButtonCallback)

go.mod

@@ -3,8 +3,25 @@ module github.com/go-flutter-desktop/go-flutter
 go 1.12
 
 require (
+	github.com/coreos/etcd v3.3.13+incompatible // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/daaku/go.zipexe v1.0.1 // indirect
 	github.com/davecgh/go-spew v1.1.1
+	github.com/go-flutter-desktop/hover v0.15.0 // indirect
 	github.com/go-gl/glfw v0.0.0-20190217072633-93b30450e032
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/nkovacs/streamquote v1.0.0 // indirect
+	github.com/otiai10/copy v1.0.1 // indirect
+	github.com/pelletier/go-toml v1.4.0 // indirect
 	github.com/pkg/errors v0.8.1
+	github.com/spf13/afero v1.2.2 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/stretchr/objx v0.2.0 // indirect
 	github.com/stretchr/testify v1.3.0
+	golang.org/x/crypto v0.0.0-20190513172903-22d7a77e9e5f // indirect
+	golang.org/x/net v0.0.0-20190514140710-3ec191127204 // indirect
+	golang.org/x/sys v0.0.0-20190516110030-61b9204099cb // indirect
+	golang.org/x/text v0.3.2 // indirect
+	golang.org/x/tools v0.0.0-20190517183331-d88f79806bbd // indirect
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )

go.sum

@@ -1,12 +1,79 @@
+bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
+github.com/GeertJohan/go.rice v1.0.0 h1:KkI6O9uMaQU3VEKaj01ulavtF7o1fWT7+pk/4voiMLQ=
+github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
+github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CLnGVd57E=
+github.com/daaku/go.zipexe v1.0.1 h1:wV4zMsDOI2SZ2m7Tdz1Ps96Zrx+TzaK15VbUaGozw0M=
+github.com/daaku/go.zipexe v1.0.1/go.mod h1:5xWogtqlYnfBXkSB1o9xysukNP9GTvaNkqzUZbt3Bw8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/go-flutter-desktop/hover v0.15.0 h1:c9aOo4xRJhJo7AdedZBARtZYll0qoygBcrqU6EpZ3aE=
+github.com/go-flutter-desktop/hover v0.15.0/go.mod h1:ysBOepB0fgxBJqKH3F1YXCE1GjX/n3kFswHR60NfTq4=
 github.com/go-gl/glfw v0.0.0-20190217072633-93b30450e032 h1:WUDJN6o1AZlnNR0UZ11zsr0Quh44CV7svcg6VzEsySc=
 github.com/go-gl/glfw v0.0.0-20190217072633-93b30450e032/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
+github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
+github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
+github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/nkovacs/streamquote v0.0.0-20170412213628-49af9bddb229/go.mod h1:0aYXnNPJ8l7uZxf45rWW1a/uME32OF0rhiYGNQ2oF2E=
+github.com/nkovacs/streamquote v1.0.0/go.mod h1:BN+NaZ2CmdKqUuTUXUEm9j95B2TRbpOWpxbJYzzgUsc=
+github.com/otiai10/copy v1.0.1 h1:gtBjD8aq4nychvRZ2CyJvFWAw0aja+VHazDdruZKGZA=
+github.com/otiai10/copy v1.0.1/go.mod h1:8bMCJrAqOtN/d9oyh5HR7HhLQMvcGMpGdwRDYsfOCHc=
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+github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
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 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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+github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
+github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
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+github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
+github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
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 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
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 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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+golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

lifecycle.go

@@ -0,0 +1,40 @@
+package flutter
+
+import (
+	"fmt"
+
+	"github.com/go-flutter-desktop/go-flutter/plugin"
+	"github.com/go-gl/glfw/v3.2/glfw"
+)
+
+const lifecycleChannelName = "flutter/lifecycle"
+
+// lifecyclePlugin implements flutter.Plugin and handles method calls to the
+// flutter/lifecycle channel.
+type lifecyclePlugin struct {
+	channel *plugin.BasicMessageChannel
+}
+
+// all hardcoded because theres not pluggable renderer system.
+var defaultLifecyclePlugin = &lifecyclePlugin{}
+
+var _ Plugin = &lifecyclePlugin{} // compile-time type check
+
+func (p *lifecyclePlugin) InitPlugin(messenger plugin.BinaryMessenger) error {
+	p.channel = plugin.NewBasicMessageChannel(messenger, lifecycleChannelName, plugin.StringCodec{})
+	return nil
+}
+
+func (p *lifecyclePlugin) glfwIconifyCallback(w *glfw.Window, iconified bool) {
+	var state string
+	switch iconified {
+	case true:
+		state = "AppLifecycleState.paused"
+	case false:
+		state = "AppLifecycleState.resumed"
+	}
+	_, err := p.channel.Send(state)
+	if err != nil {
+		fmt.Printf("go-flutter: Failed to send lifecycle event %s: %v\n", state, err)
+	}
+}

navigation.go

@@ -7,7 +7,7 @@ import (
 const navigationChannelName = "flutter/navigation"
 
 // navigationPlugin implements flutter.Plugin and handles method calls to the
-// flutter/platform channel.
+// flutter/navigation channel.
 type navigationPlugin struct {
 	channel *plugin.MethodChannel
 }

platform.go

@@ -13,14 +13,18 @@ import (
 // platformPlugin implements flutter.Plugin and handles method calls to the
 // flutter/platform channel.
 type platformPlugin struct {
+	popBehavior PopBehaviorKind
+
 	messenger  plugin.BinaryMessenger
 	glfwTasker *tasker.Tasker
 	window     *glfw.Window
 	channel    *plugin.MethodChannel
 }
 
 // hardcoded because there is no swappable renderer interface.
-var defaultPlatformPlugin = &platformPlugin{}
+var defaultPlatformPlugin = &platformPlugin{
+	popBehavior: PopBehaviorNone,
+}
 
 var _ Plugin = &platformPlugin{}     // compile-time type check
 var _ PluginGLFW = &platformPlugin{} // compile-time type check
@@ -37,6 +41,7 @@ func (p *platformPlugin) InitPluginGLFW(window *glfw.Window) (err error) {
 	p.channel.HandleFunc("Clipboard.setData", p.handleClipboardSetData)
 	p.channel.HandleFunc("Clipboard.getData", p.handleClipboardGetData)
 	p.channel.HandleFunc("SystemChrome.setApplicationSwitcherDescription", p.handleWindowSetTitle)
+	p.channel.HandleFunc("SystemNavigator.pop", p.handleSystemNavigatorPop)
 
 	return nil
 }

plugin/method-channel.go

@@ -55,10 +55,13 @@ func (m *MethodChannel) InvokeMethod(name string, arguments interface{}) (result
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to send methodcall")
 	}
+	// TODO(GeertJohan): InvokeMethod may not return any JSON. In Java this is
+	// handled by not having a callback handler, which means no reponse is
+	// expected and reponse is never unmarshalled. We should perhaps define
+	// InvokeMethod(..) and InovkeMethodNoResponse(..) to avoid errors when no
+	// response is given.
+	// https://github.com/go-flutter-desktop/go-flutter/issues/141
 	result, err = m.methodCodec.DecodeEnvelope(encodedReply)
-	if flutterError, ok := err.(*FlutterError); ok {
-		return nil, flutterError
-	}
 	if err != nil {
 		return nil, err
 	}

pop.go

@@ -0,0 +1,67 @@
+package flutter
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+// PopBehaviorKind defines how an application should handle the navigation pop
+// event from the flutter side.
+type PopBehaviorKind int
+
+const (
+	// PopBehaviorNone means the system navigation pop event is ignored.
+	PopBehaviorNone PopBehaviorKind = iota
+	// PopBehaviorHide hides the application window on a system navigation pop
+	// event.
+	PopBehaviorHide
+	// PopBehaviorIconify iconifies the application window on a system
+	// navigation pop event.
+	PopBehaviorIconify
+	// PopBehaviorClose closes the application on a system navigation pop event.
+	PopBehaviorClose
+)
+
+// PopBehavior sets the PopBehavior on the application
+func PopBehavior(popBehavior PopBehaviorKind) Option {
+	return func(c *config) {
+		// TODO: this is a workarround because there is no renderer interface
+		// yet. We rely on a platform plugin singleton to handle events from the
+		// flutter side. Should go via Application and renderer abstraction
+		// layer.
+		//
+		// Downside of this workarround is that it will configure the pop
+		// behavior for all Application's within the same Go process.
+		defaultPlatformPlugin.popBehavior = popBehavior
+	}
+}
+
+func (p *platformPlugin) handleSystemNavigatorPop(arguments interface{}) (reply interface{}, err error) {
+	switch p.popBehavior {
+	case PopBehaviorNone:
+		return nil, nil
+	case PopBehaviorHide:
+		p.glfwTasker.Do(func() {
+			p.window.Hide()
+		})
+		return nil, nil
+	case PopBehaviorIconify:
+		var err error
+		p.glfwTasker.Do(func() {
+			err = p.window.Iconify()
+		})
+		if err != nil {
+			fmt.Printf("go-flutter: error on iconifying window: %v\n", err)
+			return nil, errors.Wrap(err, "failed to iconify window")
+		}
+		return nil, nil
+	case PopBehaviorClose:
+		p.glfwTasker.Do(func() {
+			p.window.SetShouldClose(true)
+		})
+		return nil, nil
+	default:
+		return nil, errors.Errorf("unknown pop behavior %T not implemented by platform handler", p.popBehavior)
+	}
+}