[v3] Update dev guide. Remove implLock.

v3/DEVELOPMENT.md

@@ -27,6 +27,8 @@ The project has the following structure:
     ├── cmd/wails                  // CLI
     ├── examples                   // Examples of Wails apps 
     ├── internal                   // Internal packages
+    |   ├── runtime                // The Wails JS runtime
+    |   └── templates              // The supported project templates
     ├── pkg
     |   ├── application            // The core Wails library
     |   └── events                 // The event definitions
@@ -39,6 +41,17 @@ The project has the following structure:
 
 ## Development
 
+### Adding window functionality
+
+The preferred way to add window functionality is to add a new function to the `pkg/application/webview_window.go` file. This should implement all the functionality required for all platforms. Any platform specific code should be called via a `webviewWindowImpl` interface method. This interface is implemented by each of the target platforms to provide the platform specific functionality. In some cases, this may do nothing.
+Once you've added the interface method, ensure each platform implements it. A good example of this is the `SetMinSize` method.
+
+- Mac: `webview_window_darwin.go`
+- Windows: `webview_window_windows.go`
+- Linux: `webview_window_linux.go`
+
+Most, if not all, of the platform specific code should be run on the main thread. To simplify this, there are a number of `invokeSync` methods defined in `application.go`. 
+
 ### Updating the runtime
 
 The runtime is located in `v3/internal/runtime`. When the runtime is updated, the following steps need to be taken:

v3/pkg/application/webview_window.go

@@ -74,10 +74,9 @@ type WindowEventListener struct {
 }
 
 type WebviewWindow struct {
-	options  WebviewWindowOptions
-	impl     webviewWindowImpl
-	implLock sync.RWMutex
-	id       uint
+	options WebviewWindowOptions
+	impl    webviewWindowImpl
+	id      uint
 
 	eventListeners     map[uint][]*WindowEventListener
 	eventListenersLock sync.RWMutex
@@ -149,8 +148,6 @@ func (w *WebviewWindow) addCancellationFunction(canceller func()) {
 
 // SetTitle sets the title of the window
 func (w *WebviewWindow) SetTitle(title string) *WebviewWindow {
-	w.implLock.RLock()
-	defer w.implLock.RUnlock()
 	w.options.Title = title
 	if w.impl != nil {
 		invokeSync(func() {
@@ -212,9 +209,7 @@ func (w *WebviewWindow) run() {
 	if w.impl != nil {
 		return
 	}
-	w.implLock.Lock()
 	w.impl = newWindowImpl(w)
-	w.implLock.Unlock()
 	invokeSync(w.impl.run)
 }
 
@@ -431,8 +426,6 @@ func (w *WebviewWindow) Size() (int, int) {
 
 // IsFullscreen returns true if the window is fullscreen
 func (w *WebviewWindow) IsFullscreen() bool {
-	w.implLock.RLock()
-	defer w.implLock.RUnlock()
 	if w.impl == nil {
 		return false
 	}
@@ -548,8 +541,6 @@ func (w *WebviewWindow) Height() int {
 
 // Position returns the position of the window
 func (w *WebviewWindow) Position() (int, int) {
-	w.implLock.RLock()
-	defer w.implLock.RUnlock()
 	if w.impl == nil {
 		return 0, 0
 	}