Module noddybox.simplegui

ModuleInfo "Framework: (Very) Simple GUI"
ModuleInfo "Copyright: Public Domain"
ModuleInfo "Author: Ian Cowburn"
ModuleInfo "Version: $Revision$"

' $Id$

Strict
Import brl.Max2D
Import brl.Basic
Import noddybox.bitmapfont

Type TGUIFont
	Global font:TBitmapFont
End Type

Type TWidget Abstract

	Field	enabled:Int
	Field	text:String
	Field	x:Int
	Field	y:Int
	Field	w:Int
	Field	h:Int
	Field	owner:TGUIHandler
	Field	callback(w:TWidget)
	Field	mouse_over:Int
	
	Method HandleKey(k:Int)
	End Method
	
	Method MouseEnter()
		mouse_over=True
	End Method

	Method MouseLeave()
		mouse_over=False
	End Method

	Method HandleClick()
	End Method
	
	Method Draw() Abstract
	
	Function DrawBox(x:Int, y:Int, w:Int, h:Int)
		DrawLine(x,y,x+w-1,y)
		DrawLine(x+w-1,y,x+w-1,y+h-1)
		DrawLine(x+w-1,y+h-1,x,y+h-1)
		DrawLine(x,y+h-1,x,y)
	End Function

	Function Draw3DBox(x:Int, y:Int, w:Int, h:Int, invert:Int, size:Int=2)
		Local f:Int
		
		SetColor(200,200,200)
		DrawRect(x,y,w,h)

		If invert
			SetColor(170,170,170)
		Else
			SetColor(230,230,230)
		EndIf

		For f=0 Until size
			DrawLine(x+f,y+f,x+w-1-f,y+f)
			DrawLine(x+w-1-f,y+f,x+w-1-f,y+h-1-f)
		Next

		If invert
			SetColor(230,230,230)
		Else
			SetColor(170,170,170)
		EndIf

		For f=0 Until size
			DrawLine(x+w-1-f,y+h-1-f,x+f,y+h-1-f)
			DrawLine(x+f,y+h-1-f,x+f,y+f)
		Next
	End Function

End Type

Type TLabel Extends TWidget
	Function Create:TLabel(gui:TGUIHandler,x:Int, y:Int, text:String)
		Local o:TLabel=New TLabel
		o.enabled=True
		o.x=x
		o.y=y
		o.w=TGUIFont.font.TextWidth(text)+2
		o.h=TGUIFont.font.MaxHeight()+1
		o.text=text
		gui.Register(o)
		Return o
	End Function
	
	Method Draw()
		TGUIFont.font.Draw(text,x+1,y+1)
	End Method

End Type

Type TText Extends TWidget
	Field	maxlen:Int
	
	Function Create:TText(gui:TGUIHandler,x:Int, y:Int, text:String, maxlen:Int, callback(w:TWidget)=Null)
		Local o:TText=New TText
		o.enabled=True
		o.x=x
		o.y=y
		o.maxlen=maxlen
		o.w=TGUIFont.font.MaxWidth()*(maxlen+1)+2
		o.h=TGUIFont.font.MaxHeight()+2
		o.text=text
		o.callback=callback
		gui.Register(o)
		Return o
	End Function
	
	Method HandleClick()
		owner.SetFocus(Self)
	End Method
	
	Method HandleKey(k:Int)
		If k=8
			If text.length>0
				text=text[0..text.length-1]
			EndIf
		Else If k=13
			If callback<>Null
				callback(Self)
				owner.SetFocus(Null)
			EndIf
		Else If k>31 And k<127 And text.length<maxlen
			text:+Chr(k)
		EndIf
	End Method
	
	Method Draw()
		Local s:String=text
		
		If owner.GetFocus()=Self
			SetColor(128,128,128)
			s:+"_"
		Else
			SetColor(64,64,64)
		EndIf
		
		DrawRect(x,y,w,h)
		
		TGUIFont.font.Draw(s,x+1,y+1)
	End Method
End Type

Type TCheckbox Extends TWidget
	Field	checked:Int
	
	Function Create:TCheckbox(gui:TGUIHandler, x:Int, y:Int, text:String, callback(w:TWidget)=Null)
		Local o:TCheckbox=New TCheckbox
		o.enabled=True
		o.x=x
		o.y=y
		o.w=TGUIFont.font.TextWidth(" "+text)+4+TGUIFont.font.MaxHeight()
		o.h=TGUIFont.font.MaxHeight()+2
		o.text=text
		o.callback=callback
		gui.Register(o)
		Return o
	End Function
	
	Method HandleClick()
		checked=Not checked
		
		If callback<>Null
			callback(Self)
		EndIf
	End Method
	
	Method Draw()
		If (mouse_over)
			SetColor(255,255,255)
		Else
			SetColor(200,200,200)
		EndIf

		DrawBox(x,y,TGUIFont.font.MaxHeight(),TGUIFont.font.MaxHeight())
		
		If checked
			SetColor(255,100,100)
			DrawRect(x+1,y+1,TGUIFont.font.MaxHeight()-2,TGUIFont.font.MaxHeight()-2)
		EndIf
		
		TGUIFont.font.Draw(" "+text,x+2+TGUIFont.font.MaxHeight(),y+1)
	End Method
End Type

Type TButton Extends TWidget

	Field ox:Int
	Field oy:Int
	
	Function Create:TButton(gui:TGUIHandler, x:Int, y:Int, w:Int, h:Int, text:String, callback(w:TWidget))
		Local o:TButton=New TButton
		o.enabled=True
		o.x=x
		o.y=y
		o.w=w
		o.h=h
		o.text=text
		o.ox=x+w/2-TGUIFont.font.TextWidth(text)/2
		o.oy=y+h/2-TGUIFont.font.TextHeight(text)/2
		o.callback=callback
		gui.Register(o)
		Return o
	End Function
	
	Method HandleClick()
		If callback<>Null
			callback(Self)
		EndIf
	End Method

	Method Draw()
		If (mouse_over)
			SetColor(255,255,255)
			DrawBox(x,y,w,h)
		EndIf
		
		Draw3DBox(x+1,y+1,w-2,h-2,False,2)
		
		TGUIFont.font.Draw(text,ox,oy)
	End Method
End Type

Type TGUIHandler

	' These are private
	'
	Field 	m_widgets:TList
	Field	m_focus:TWidget
	Field	m_over:TWidget
	Field	m_clicked:TWidget

	' Creates a new GUI handler
	'	
	Function Create:TGUIHandler()
		Local o:TGUIHandler
		
		o=New TGUIHandler
		
		o.m_widgets=CreateList()
		o.m_focus=Null
		o.m_over=Null
		o.m_clicked=Null

		Return o
	End Function
	
	' Register a widget
	'
	Method Register(w:TWidget)
		m_widgets.AddLast(w)
		w.owner=Self
	End Method
	
	' Clear widgets
	'
	Method Clear()
		m_widgets.Clear()
	End Method
	
	' Set the keyboard focus (null for none)
	'
	Method SetFocus(w:TWidget)
		m_focus=w
	End Method
	
	' Get the keyboard focus (null for none)
	'
	Method GetFocus:TWidget()
		Return m_focus
	End Method
	
	' Gets the last clicked widget
	'
	Method Clicked:TWidget()
		Local last:TWidget=m_clicked
		m_clicked=Null
		Return last
	End Method
	
	' Perform a loop and any necessary events
	'
	Method EventLoop()
		Local x:Int=MouseX()
		Local y:Int=MouseY()
		Local b:Int=KeyHit(KEY_MOUSELEFT)>0
		
		Local w:TWidget=LocateWidget(x,y)
		
		For Local w:TWidget=EachIn m_widgets
			If w.enabled
				w.Draw()
			EndIf
		Next
		
		If w<>m_over
			If m_over<>Null
				m_over.MouseLeave()
			EndIf
			m_over=w
			If m_over<>Null
				m_over.MouseEnter()
			EndIf
		EndIf
		
		If w<>Null And w.enabled And b
			w.HandleClick()
			m_clicked=w
		EndIf
		
		Local k:Int=GetChar()
		
		If k<>0 And m_focus<>Null And m_focus.enabled
			m_focus.HandleKey(k)
		EndIf
	End Method
	
	' Private method
	'
	Method LocateWidget:TWidget(x:Int,y:Int)
		For Local w:TWidget=EachIn m_widgets
			If x>=w.x And y>=w.y And x<w.x+w.w And y<w.y+w.h
				Return w
			EndIf
		Next
		Return Null
	End Method
End Type


Function GUINotify(s:String)
	Local back:TImage=CreateImage(GraphicsWidth(),GraphicsHeight(),1,0)
	GrabImage(back,0,0)
	
	Local w:Int=Max(TGUIFont.font.TextWidth(s)+10,GraphicsWidth()/4)
	Local h:Int=TGUIFont.font.TextHeight(s)*5
	Local x:Int=GraphicsWidth()/2-w/2
	Local y=GraphicsHeight()/2-h/2
	Local by=y+TGUIFont.font.TextHeight(s)*2.5
	
	Local gui:TGUIHandler=TGUIHandler.Create()
	
	Local label:TLabel=TLabel.Create(gui,x+5,y+5,s)
	Local button:TButton=TButton.Create(gui,x+5,by,w-10,TGUIFont.font.TextHeight(s)+10,"OK",Null)
	
	Local click:TWidget=Null
	
	While click<>button
		Cls
		DrawImage(back,0,0)
		TWidget.Draw3DBox(x,y,w,h,False,2)
		gui.EventLoop()
		click=gui.Clicked()
		Flip
		FlushMem
	Wend
End Function

Function GUIYesNo:Int(s:String)
	Local back:TImage=CreateImage(GraphicsWidth(),GraphicsHeight(),1,0)
	GrabImage(back,0,0)
	
	Local w:Int=Max(TGUIFont.font.TextWidth(s)+10,GraphicsWidth()/4)
	Local h:Int=TGUIFont.font.TextHeight(s)*7
	Local x:Int=GraphicsWidth()/2-w/2
	Local y=GraphicsHeight()/2-h/2
	Local by=y+TGUIFont.font.TextHeight(s)*2
	
	Local gui:TGUIHandler=TGUIHandler.Create()
	
	Local label:TLabel=TLabel.Create(gui,x+5,y+5,s)
	Local yes:TButton=TButton.Create(gui,x+5,by,w-10,TGUIFont.font.TextHeight(s)+10,"Yes",Null)
	Local no:TButton=TButton.Create(gui,x+5,by+yes.h+2,w-10,TGUIFont.font.TextHeight(s)+10,"No",Null)
	
	Local click:TWidget=Null
	
	While click=Null
		Cls
		DrawImage(back,0,0)
		TWidget.Draw3DBox(x,y,w,h,False,2)
		gui.EventLoop()
		click=gui.Clicked()
		Flip
		FlushMem
	Wend
	
	Return click=yes
End Function


Function GUIMenu(title:String, options:String[],x,y)
	Local f:Int
	Local back:TImage=CreateImage(GraphicsWidth(),GraphicsHeight(),1,0)
	GrabImage(back,0,0)
	
	Local st:Int=TGUIFont.font.MaxHeight()*2
	Local h:Int=TGUIFont.font.MaxHeight()*3
	Local w:Int=TGUIFont.font.TextWidth(title)+30
	
	For f=0 Until options.length
		w=Max(w,TGUIFont.font.TextWidth(options[f])+30)
		h:+st
	Next
	
	Local gui:TGUIHandler=TGUIHandler.Create()
	
	Local label:TLabel=TLabel.Create(gui,x+5,y+2,title)
	Local button:TButton[]=New TButton[options.length]
	
	For f=0 Until options.length
		button[f]=TButton.Create(gui,x+5,y+TGUIFont.font.MaxHeight()*2+f*st,w-10,st-2,options[f],Null)
	Next
	
	Local click:TWidget=Null
	
	While click=Null And KeyHit(KEY_MOUSERIGHT)=0
		Cls
		DrawImage(back,0,0)
		TWidget.Draw3DBox(x,y,w,h,False,2)
		gui.EventLoop()
		click=gui.Clicked()
		Flip
		FlushMem
	Wend
	
	For f=0 Until options.length
		If button[f]=click
			Return f
		EndIf
	Next
	
	Return -1
End Function