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Found #1 item in Menu category by Kevin Picone

Simple Text Menu

By: Kevin Picone Added: June 21st, 2022

Category: All,GUI,Menu

Simple Text Menu

While tinkering last night, I wrote a simple menu library that lets the programmer define a list of text options that can have a key and mousing bindings as well. The library is more a starting point than a end product, but it shows a way how we can wrap a system into library that help us separate that functionality from the main program. The user can tag a function (by name) that is called when any option is clicked or the key binding is pressed.

Example:

So our processing loop looks like this..

PlayBasic Code:

	loadfont "verdana",1 , 48


		cr$=chr$(10)+chr$(13)

	
		Options$ =" L) Load File        [BindKey=38][OnClick=LOAD_FUNCTION]"+cr$
		Options$+=" S) Save File        [BindKey=31][OnClick=SAVE_FUNCTION]"+cr$
		Options$+=" D) Delete File        [BindKey=32][OnClick=DELETE_FUNCTION]"+cr$


	//  
	GUI_CREATE_SIMPLE_MENU(Options$)


	Do	
		cls $304050
		
		 GUI_UPDATE_SIMPLE_MENU_INPUTSTATE()
		 GUI_DRAW_SIMPLE_MENU()
	
	
		action$=GUI_Get_SIMPLE_MENU_CLICKS()
	
		if Len(Action$)
				Index=FunctionIndex(Action$)
				if Index
						CallFunction Action$
				endif
		endif	
		 
		sync
	loop



Function LOad_Function()
	cls 255
			print "LOAD FUNCTION"
EndFunction

Function SAVE_Function()
	cls $00ff00
			Print "SAVE FUNCTION"
EndFunction

Function DELETE_Function()
	cls $ff0000
			Print "DELETE FUNCTION"
EndFunction

COMMANDS USED: LOADFONT | CHR$ | CLS | LEN | SYNC | PRINT |

COMPLETE EXAMPLE:

PlayBasic Code:

	loadfont "verdana",1 , 48


		cr$=chr$(10)+chr$(13)

	
		Options$ =" L) Load File        [BindKey=38][OnClick=LOAD_FUNCTION]"+cr$
		Options$+=" S) Save File        [BindKey=31][OnClick=SAVE_FUNCTION]"+cr$
		Options$+=" D) Delete File        [BindKey=32][OnClick=DELETE_FUNCTION]"+cr$


	//  
	GUI_CREATE_SIMPLE_MENU(Options$)


	Do	
		cls $304050
		
		 GUI_UPDATE_SIMPLE_MENU_INPUTSTATE()
		 GUI_DRAW_SIMPLE_MENU()
	
	
		action$=GUI_Get_SIMPLE_MENU_CLICKS()
	
		if Len(Action$)
				Index=FunctionIndex(Action$)
				if Index
						CallFunction Action$
				endif
		endif	
		 
		sync
	loop



Function LOad_Function()
	cls 255
			print "LOAD FUNCTION"
EndFunction

Function SAVE_Function()
	cls $00ff00
			Print "SAVE FUNCTION"
EndFunction

Function DELETE_Function()
	cls $ff0000
			Print "DELETE FUNCTION"
EndFunction
	

//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------
//------------------------------------------------------------------


		Type tSimpleTextMenuInputState
					Status
					MX
					MY
					MB
					ScanCode
		EndType



		Type tSimpleTextMenu
				Caption$

				KeyBindingScanCode				
				FunctionToCall$


				x1,y1,x2,y2		; render position of this on screen
				MouseOver
		EndType

		Dim SimpleTextMenu(256) as tSimpleTextmenu

		Dim SimpleTextmenuInputState as tSimpleTextMenuInputState


function GUI_CREATE_SIMPLE_MENU(MenuOptions$)
	
		// Redim the Global Memu 
		Dim SimpleTextMenu(256) as tSimpleTextmenu

		//
		GUI_INIT_SIMPLE_MENU_INPUTSTATE()		


		dim Rows$(1024)
	
		Options$=Replace$(MenuOptions$,chr$(10),"")
		
		LinesOfText = SplitToArray(options$,chr$(13),rows$(),0,0)
		
		
		MenuIndex =1
		
		for lp=0 to LinesOftext-1
			
					s$=Rows$(lp)
					
					// Check for empty line
					if len(trim$(S$))>0
							Param_KeyBind$		=""
							Param_Onclick$		=""

							Current_Pos =1
							do

								// Look for square brackets							
								Left_pos=instring(s$,"[",Current_pos)
								if Left_Pos
										Right_pos=instring(s$,"]",Current_pos)
										If Right_Pos>Left_Pos
											
											Opcode$=Mid$(s$,Left_pos+1,(Right_Pos-Left_Pos)-1)
											
											
											Current_Pos=Left_pos
											S1$=     Left$(s$,Left_pos-1)
											S2$=  CutLeft$(s$,Right_pos)
											s$=s1$+s2$

											// get Opcode and Value 
											Value$		=""
											Equals_pos  = instring(opcode$,"=")
											if Equals_pos
												Value$	= CutLeft$(Opcode$,Equals_pos)
												Opcode$	=    Left$(Opcode$,Equals_pos-1)
											endif
										
											Select upper$(trim$(opcode$))
														
													//  process embedded opcodes for this menu option	
													case "ONCLICK"
															Param_Onclick$ = value$
												
													case "KEYBIND", "BINDKEY", "KEY"
															Param_KEYBIND$ = value$
															
											EndSelect			
											
											//  reset the next search 
											Current_pos=Left_pos								
										else
											Current_Pos=Left_pos+1	
										endif		
								else
										exitdo																		
								endif
							loop 
							
							// -----------------------------------------------
							if Len(s$)
							// -----------------------------------------------

									SimpleTextMenu(MenuIndex)=New tSimpleTextMenu
									
									SimpleTextMenu(MenuIndex).Caption 				=s$
									SimpleTextMenu(MenuIndex).KeyBindingScanCode  =val(Param_KeyBind$)
									SimpleTextMenu(MenuIndex).FunctionToCall		 =Param_OnClick$
									MenuIndex ++
							endif

					endif			
					
		next		
	
EndFunction



	
function GUI_DRAW_SIMPLE_MENU()
	
		GUI_INIT_SIMPLE_MENU_INPUTSTATE()
	
	
		//  Message includes the ONCLICK=	
		
		MouseStatus = 		SimpleTextmenuInputState.Status
		Mx				= 		SimpleTextmenuInputState.MX
		My 			= 		SimpleTextmenuInputState.MY
		Mb 			= 		SimpleTextmenuInputState.MB

		CursorX		=GetCursorX()
		CursorY		=GetCursorY()	
	
		TH =GettextHeight("|")
		for lp=0 to getArrayElements(SimpleTextMenu())
			if SimpleTextMenu(lp)
			
					T$=SimpleTextMenu(lp).Caption$
					
					CursorX2 = CursorX1+GettextWidth(t$)
					CursorY2 = CursorY1+TH
			
					SimpleTextMenu(lp).x1=CursorX1	
					SimpleTextMenu(lp).X2=CursorX2	
					SimpleTextMenu(lp).Y1=CursorY1	
					SimpleTextMenu(lp).Y2=CursorY2
					
					
					MouseOverState = 0
					if MouseStatus
						if range(My,CursorY1,CursorY2-1)
							inkmode 1+32
							c=GetInk()
							BoxC 0,CursorY1,getSurfaceWidth(),CursorY2,true,RgbFade(c,50)
							inkmode 1
							
							MouseOverState = 1
							
						endif					
					endif

					SimpleTextMenu(lp).MouseOver		=MouseOverState

					// Check if mouse over

					text CursorX1,CursorY1, t$

					CursorY1=CursorY2
			
			endif
		next		
	
EndFunction



Function GUI_Get_SIMPLE_MENU_CLICKS()
	
	
		GUI_INIT_SIMPLE_MENU_INPUTSTATE()
	
	
		MouseStatus = 		SimpleTextmenuInputState.Status
		Mx				= 		SimpleTextmenuInputState.MX
		My 			= 		SimpleTextmenuInputState.MY
		Mb 			= 		SimpleTextmenuInputState.MB
	
		if MouseStatus
			if MB
				for lp=0 to getArrayElements(SimpleTextMenu())
					if SimpleTextMenu(lp)
						if SimpleTextMenu(lp).MouseOver	
							if Mb & 1
								Action$ = SimpleTextMenu(lp).FunctionToCall
							endif
						endif
					endif
				next	
			endif
		endif

		SC = SimpleTextmenuInputState.ScanCode
		if SC	
			for lp=0 to getArrayElements(SimpleTextMenu())
				if SimpleTextMenu(lp)
					if SimpleTextMenu(lp).KeyBindingScanCode=SC
							Action$ = SimpleTextMenu(lp).FunctionToCall
					endif
				endif
			next	
		endif


EndFunction Action$



Function GUI_UPDATE_SIMPLE_MENU_INPUTSTATE()
	
		GUI_INIT_SIMPLE_MENU_INPUTSTATE()

		SimpleTextmenuInputState.Status = true
		SimpleTextmenuInputState.Mx =MouseX()
		SimpleTextmenuInputState.MY =MouseY()
		SimpleTextmenuInputState.MB =MouseButton()


		SimpleTextmenuInputState.ScanCode =ScanCode()
		
	
EndFunction


Function GUI_INIT_SIMPLE_MENU_INPUTSTATE()
	
	
		 if GetArrayStatus(SimpleTextmenuInputState())=false
				Dim SimpleTextmenuInputState as tSimpleTextMenuInputState
		 endif 

	
EndFunction

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