Add Window creation hooks

Add InjectJS() to plugins interface

v3/pkg/application/application.go

@@ -166,6 +166,9 @@ type App struct {
 	contextMenusLock sync.Mutex
 
 	assets *assetserver.AssetServer
+
+	// Hooks
+	windowCreatedCallbacks []func(window *WebviewWindow)
 }
 
 func (a *App) getSystemTrayID() uint {
@@ -243,6 +246,11 @@ func (a *App) NewWebviewWindowWithOptions(windowOptions *WebviewWindowOptions) *
 	a.windows[id] = newWindow
 	a.windowsLock.Unlock()
 
+	// Call hooks
+	for _, hook := range a.windowCreatedCallbacks {
+		hook(newWindow)
+	}
+
 	if a.running {
 		newWindow.run()
 	}
@@ -560,3 +568,7 @@ func (a *App) getContextMenu(name string) (*Menu, bool) {
 	return menu, ok
 
 }
+
+func (a *App) OnWindowCreation(callback func(window *WebviewWindow)) {
+	a.windowCreatedCallbacks = append(a.windowCreatedCallbacks, callback)
+}

v3/pkg/application/plugins.go

@@ -4,8 +4,8 @@ type Plugin interface {
 	Name() string
 	Init(app *App) error
 	Shutdown()
-	// Exported is a list of method names that should be exposed to the frontend
 	CallableByJS() []string
+	InjectJS() string
 }
 
 type PluginManager struct {
@@ -13,9 +13,11 @@ type PluginManager struct {
 }
 
 func NewPluginManager(plugins map[string]Plugin) *PluginManager {
-	return &PluginManager{
+	result := &PluginManager{
 		plugins: plugins,
 	}
+	globalApplication.OnWindowCreation(result.onWindowCreation)
+	return result
 }
 
 func (p *PluginManager) Init() error {
@@ -23,6 +25,10 @@ func (p *PluginManager) Init() error {
 		err := plugin.Init(globalApplication)
 		if err != nil {
 			return err
+		}
+		injectJS := plugin.InjectJS()
+		if injectJS != "" {
+
 		}
 		globalApplication.info("Plugin '%s' initialised", plugin.Name())
 	}
@@ -35,3 +41,12 @@ func (p *PluginManager) Shutdown() {
 		globalApplication.info("Plugin '%s' shutdown", plugin.Name())
 	}
 }
+
+func (p *PluginManager) onWindowCreation(window *WebviewWindow) {
+	for _, plugin := range p.plugins {
+		injectJS := plugin.InjectJS()
+		if injectJS != "" {
+			window.ExecJS(injectJS)
+		}
+	}
+}

v3/plugins/TODO.md

@@ -0,0 +1,3 @@
+# TODO
+
+- [ ] Add InjectCSS() to the plugin API?