try to copy whole design from python gameshell launcher

sysgo/UI/page.go

@@ -0,0 +1,149 @@
+package UI
+
+import (
+	"sync"
+	
+	"github.com/veandco/go-sdl2/sdl"
+	
+)
+
+type element struct {
+    data interface{}
+    next *element
+}
+
+type PageStack struct {
+    lock *sync.Mutex
+    head *element
+    Size int
+}
+
+func (stk *PageStack) Push(data interface{}) {
+    stk.lock.Lock()
+
+    element := new(element)
+    element.data = data
+    temp := stk.head
+    element.next = temp
+    stk.head = element
+    stk.Size++
+
+    stk.lock.Unlock()
+}
+
+func (stk *PageStack) Pop() interface{} {
+    if stk.head == nil {
+        return nil
+    }
+    stk.lock.Lock()
+    r := stk.head.data
+    stk.head = stk.head.next
+    stk.Size--
+
+    stk.lock.Unlock()
+
+    return r
+}
+
+func NewPageStack() *PageStack {
+    stk := new(PageStack)
+    stk.lock = &sync.Mutex{}
+    return stk
+}
+
+
+type PageSelector struct {
+	
+	PosX int
+	PosY int
+	Width int
+	Height int
+	Parent interface{} //
+	Alpha int
+	OnShow bool
+	IconSurf  *sdl.Surface
+	
+}
+
+func (p *PageSelector) Adjust(x,y,w,h,alpha int) {
+	p.PosX = x
+	p.PosY = y
+	p.Width = w
+	p.Height = h
+	p.Alpha  = alpha
+}
+
+func (p *PageSelector) Draw() {
+	
+}
+
+
+type PageInterface interface {
+	// shared functions
+	// GetScreen
+	// GetIcons
+	// SetScreen
+	// SetFootMsg
+	// SetCanvasHWND
+	// GetCanvasHWND
+	// GetHWND
+	// SetHWND
+	// AdjustHLeftAlign
+	// AdjustSAutoLeftAlign
+	// SetPsIndex
+	// SetIconIndex
+	// GetPsIndex
+	// GetIconIndex
+	// Coord
+	// Size
+}
+
+type Page struct {
+
+	PosX int
+	PosY int
+	Width int
+	Height int
+	Icons []interface{} // make first
+	IconNumbers int
+	IconIndex int
+	PrevIconIndex int
+	
+	Ps interface{}
+	PsIndex int
+
+	Index int
+
+	Align string
+	
+	CanvasHWND *sdl.Surface
+	HWND       *sdl.Surface
+
+	OnShow bool
+
+	Name  string
+	Screen *MainScreen
+	
+	PageIconMargin int // default 20
+	FootMsg  [5]string
+
+	SelectedIconTopOffset int
+	EasingDur int
+}
+
+func NewPage() *Page {
+	p := &Page{}
+	p.PageIconMargin = 20
+	p.SelectedIconTopOffset = 20
+	p.EasingDur = 30
+	
+	p.FootMsg = [5]string{"Nav.","","","","Enter"}
+
+	return p
+}
+
+
+
+
+
+