pkg/graphics: optimized fbdev backend and added multiple widgets

cmd/compositor/desktop.go

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2025 Manjeet Singh <itsmanjeet1998@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package main
+
+import (
+	"image"
+	"image/color"
+
+	"rlxos.dev/pkg/graphics/canvas"
+	"rlxos.dev/pkg/graphics/event"
+	"rlxos.dev/pkg/graphics/widget"
+)
+
+type Desktop struct {
+	widget.BaseWidget
+
+	Background color.Color
+	Panel      Panel
+	windows    []widget.Widget
+}
+
+func NewDesktop() *Desktop {
+	d := &Desktop{
+		Background: color.Black,
+		windows:    []widget.Widget{},
+	}
+
+	return d
+}
+
+func (d *Desktop) AddWindow(w widget.Widget) {
+	d.windows = append(d.windows, w)
+}
+
+func (d *Desktop) SetBounds(rect image.Rectangle) {
+	d.BaseWidget.SetBounds(rect)
+	d.Panel.SetBounds(rect)
+}
+
+func (d *Desktop) Draw(c canvas.Canvas) {
+	c.SetColor(d.Background)
+	c.FillRect(d.Bounds)
+
+	for _, w := range d.windows {
+		w.Draw(c)
+	}
+
+	d.Panel.Draw(c)
+}
+
+func (d *Desktop) Update(e event.Event) {
+	d.Panel.Update(e)
+}

cmd/compositor/main.go

@@ -1,37 +1,14 @@
 package main
 
 import (
-	"image/color"
 	"log"
 
 	"rlxos.dev/pkg/graphics/app"
-	"rlxos.dev/pkg/graphics/driver/fbdev"
-	"rlxos.dev/pkg/graphics/widget"
 )
 
 func main() {
-	if err := app.Run(&widget.Container{
-		Orientation: widget.Horizontal,
-		Spacing:     10,
-		Children: []widget.Widget{
-			&widget.Button{
-				BackgroundColor: color.RGBA{R: 33, G: 33, B: 33, A: 255},
-				HoverColor:      color.RGBA{97, 97, 97, 255},
-				OnClick: func() {
-					log.Println("Clicked 1")
-				},
-			},
-			&widget.Button{
-				BackgroundColor: color.RGBA{R: 88, G: 88, B: 88, A: 255},
-				HoverColor:      color.RGBA{97, 97, 97, 255},
-				OnClick: func() {
-					log.Println("Clicked 2")
-				},
-			},
-		},
-	}, &fbdev.Driver{
-		Device: "/dev/fb0",
-	}); err != nil {
+	desktop := NewDesktop()
+	if err := app.Run(desktop); err != nil {
 		log.Fatal(err)
 	}
 }

cmd/compositor/panel.go

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2025 Manjeet Singh <itsmanjeet1998@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package main
+
+import (
+	"image"
+	"image/color"
+
+	"rlxos.dev/pkg/graphics/canvas"
+	"rlxos.dev/pkg/graphics/event"
+	"rlxos.dev/pkg/graphics/widget"
+)
+
+type PanelPosition int
+
+const (
+	PanelPositionTop PanelPosition = iota
+	PanelPositionBottom
+)
+
+type Panel struct {
+	widget.BaseWidget
+
+	Position        PanelPosition
+	StartButton     widget.Widget
+	BackgroundColor color.Color
+	Color           color.Color
+	Padding         int
+	Size            int
+}
+
+func NewPanel(position PanelPosition) *Panel {
+	p := &Panel{
+		Position: position,
+		StartButton: &widget.Button{
+			Label: "Start",
+		},
+	}
+
+	return p
+}
+
+func (p *Panel) SetBounds(rect image.Rectangle) {
+	switch p.Position {
+	case PanelPositionBottom:
+		p.BaseWidget.SetBounds(image.Rect(rect.Min.X, rect.Min.Y, rect.Max.X, p.Size))
+	case PanelPositionTop:
+		p.BaseWidget.SetBounds(image.Rect(rect.Min.X, rect.Max.Y-p.Size, rect.Max.X, rect.Max.Y))
+	}
+
+	p.StartButton.SetBounds(image.Rect(rect.Min.X, rect.Min.Y, p.Size-p.Padding, p.Size-p.Padding))
+}
+
+func (p *Panel) Draw(c canvas.Canvas) {
+	c.SetColor(p.BackgroundColor)
+	c.FillRect(p.Bounds)
+
+	p.StartButton.Draw(c)
+}
+func (p *Panel) Update(e event.Event) {
+	p.StartButton.Update(e)
+}

pkg/graphics/app/app.go

@@ -20,14 +20,15 @@ package app
 import (
 	"fmt"
 	"log"
+	"time"
 
 	"rlxos.dev/pkg/graphics/driver"
 	"rlxos.dev/pkg/graphics/event"
 	"rlxos.dev/pkg/graphics/widget"
 )
 
 func Run(w widget.Widget, drivers ...driver.Driver) error {
-	if drivers == nil {
+	if len(drivers) == 0 {
 		drivers = supportedDrivers
 	}
 
@@ -55,7 +56,8 @@ func Run(w widget.Widget, drivers ...driver.Driver) error {
 
 	running := true
 	for running {
-		for _, ev := range selectedDriver.PollEvent() {
+		events := selectedDriver.PollEvent()
+		for _, ev := range events {
 			switch ev := ev.(type) {
 			case error:
 				log.Println("ERROR", err)
@@ -70,6 +72,10 @@ func Run(w widget.Widget, drivers ...driver.Driver) error {
 		if w.IsDamaged() {
 			surface.Update()
 		}
+
+		if len(events) == 0 {
+			time.Sleep(10 * time.Millisecond)
+		}
 	}
 
 	return nil