perf: use goroutine to implement window resize events.

perf: optimized window display in fullscreen and maximized modes. #19

backend/services/system_service.go

@@ -0,0 +1,105 @@
+package services
+
+import (
+	"context"
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+	"log"
+	"sync"
+	"time"
+	"tinyrdm/backend/types"
+)
+
+type systemService struct {
+	ctx context.Context
+}
+
+var system *systemService
+var onceSystem sync.Once
+
+func System() *systemService {
+	if system == nil {
+		onceSystem.Do(func() {
+			system = &systemService{}
+			go system.loopWindowEvent()
+		})
+	}
+	return system
+}
+
+func (s *systemService) Start(ctx context.Context) {
+	s.ctx = ctx
+}
+
+// SelectFile open file dialog to select a file
+func (s *systemService) SelectFile(title string) (resp types.JSResp) {
+	filepath, err := runtime.OpenFileDialog(s.ctx, runtime.OpenDialogOptions{
+		Title:           title,
+		ShowHiddenFiles: true,
+	})
+	if err != nil {
+		log.Println(err)
+		resp.Msg = err.Error()
+		return
+	}
+	resp.Success = true
+	resp.Data = map[string]any{
+		"path": filepath,
+	}
+	return
+}
+
+func (s *systemService) loopWindowEvent() {
+	var fullscreen, maximised, minimised, normal bool
+	var width, height int
+	var dirty bool
+	for {
+		time.Sleep(300 * time.Millisecond)
+		if s.ctx == nil {
+			continue
+		}
+
+		dirty = false
+		if f := runtime.WindowIsFullscreen(s.ctx); f != fullscreen {
+			// full-screen switched
+			fullscreen = f
+			dirty = true
+		}
+
+		if w, h := runtime.WindowGetSize(s.ctx); w != width || h != height {
+			// window size changed
+			width, height = w, h
+			dirty = true
+		}
+
+		if m := runtime.WindowIsMaximised(s.ctx); m != maximised {
+			maximised = m
+			dirty = true
+		}
+
+		if m := runtime.WindowIsMinimised(s.ctx); m != minimised {
+			minimised = m
+			dirty = true
+		}
+
+		if n := runtime.WindowIsNormal(s.ctx); n != normal {
+			normal = n
+			dirty = true
+		}
+
+		if dirty {
+			runtime.EventsEmit(s.ctx, "window_changed", map[string]any{
+				"fullscreen": fullscreen,
+				"width":      width,
+				"height":     height,
+				"maximised":  maximised,
+				"minimised":  minimised,
+				"normal":     normal,
+			})
+
+			if !fullscreen && !minimised {
+				// save window size
+				Preferences().SaveWindowSize(width, height)
+			}
+		}
+	}
+}