[bb] Simple buttons by Pongo [ 1+ years ago ]

[BlitzBot]

Title : Simple buttons
Author : Pongo
Posted : 1+ years ago

Description : This code will let you create buttons purely from code or load an image button and respond to button presses. This is merely set up as a very simple way to make these without resorting to a GUI lib.

Code :

Code: BlitzBasic

1. Graphics 640,480,0,2
2. SetBuffer BackBuffer()
3.  
4. Global mx,my,info$
5. Global buttonheld,ID_clicked
6.  
7. Type button
8.         Field image$    ;image containing button graphics
9.         Field x                         ;x position of button
10.         Field y                         ;y pos of button
11.         Field width             ;width of button
12.         Field height            ;height of button
13.         Field id                        ;so we know which button has been pressed
14.         Field state             ;mouse over/up/down
15. End Type
16.  
17. ; create text button examples
18. ;Create a button like this: CreateTextButton.button (Label$,    x,y,    width,height,   id,     centered = False)
19. b1.button = CreateTextButton ("Test A",         50,50,  100,20,  1,     0)
20. b2.button = CreateTextButton ("Test B", 50,80,  100,20,  2,     0)
21. ;if you use the centered option, the button will x position will be overidden and the button will center on the screen vertical axis
22. centered.button = CreateTextButton ("Centered long type",50,80,150,20, 3,1)
23.  
24. ;##     Create an image button like this:  CreateImageButton.button (image$,x,y,id,centered = False)
25. ;##     buttonimage = LoadAnimImage ("buttontest1.png",128,32,0,3)
26. ;##     b.button = CreateImageButton (buttonimage,      50,250,5)
27.  
28. ; create image button example. You will need to supply your own image with 3 frames,... normal, hit and rollover)
29. ;Create an image button like this:  CreateImageButton.button (image,x,y,id,centered = False)
30.  
31.  
32. ;b.button = CreateImageButton (LoadAnimImage ("buttontest1.png",128,32,0,3),    50,250, 5)
33.  
34.  
35. While Not KeyHit(1)
36.         mx = MouseX () : my = MouseY() ; grab the mouse position at the top of the loop
37.  
38.         updatebuttons() ; check rollover state and draw buttons to screen. Call this every loop.
39.         buttonaction() ;this will execute the results of any button presses.
40.  
41.         Text 50,420,Info$
42.  
43.         If KeyDown(57)
44.                 ;draw a cursor crosshair on the screen with the mouse coords
45.                 Line mx,0,mx,GraphicsHeight() : Line 0,my,GraphicsWidth(),my ; draw crosshair on screen
46.                 Text 0,0,mx + "," + my
47.         EndIf
48.  
49.         Flip
50.         Cls
51. Wend
52. End
53.  
54. Function CreateTextButton.button (Label$,x,y,width,height,id,centered = False)
55.         b.button = New button
56.  
57.         bimage = CreateImage(width,height,3)
58.  
59.         ;normal state of button
60.         SetBuffer ImageBuffer(bimage,0)
61.         Color 140,140,140
62.         Rect 0,0,width,height,1 ;fill
63.         Color 0,255,0
64.         Rect 0,0,width,height,0 ;outline
65.         Color 255,255,255
66.         Text width*.5,height*.5,label$,1,1
67.  
68.         ;hit state of button
69.         SetBuffer ImageBuffer(bimage,1)
70.         Color 220,220,220
71.         Rect 0,0,width,height,1 ;fill
72.         Color 255,0,0
73.         Rect 0,0,width,height,0 ;outline
74.         Color 0,0,0
75.         Text width*.5,height*.5,label$,1,1
76.  
77.         ;Rollover state of button
78.         SetBuffer ImageBuffer(bimage,2)
79.         Color 180,180,180
80.         Rect 0,0,width,height,1 ;fill
81.         Color 0,255,0
82.         Rect 0,0,width,height,0 ;outline
83.         Color 255,255,255
84.         Text width*.5,height*.5,label$,1,1
85.  
86.         SetBuffer BackBuffer()
87.  
88.         bx = x
89.         by = y
90.         bwidth = ImageWidth(bimage)
91.         bheight = ImageHeight(bimage)
92.         bid = id
93.         bstate = 0
94.  
95.         If centered Then bx = (GraphicsWidth()*.5) - (bwidth*.5) ;center on screen vertically
96.  
97.         Return b
98. End Function
99.  
100. Function CreateImageButton.button (image,x,y,id,centered = False)
101.         b.button = New button
102.         bimage = image
103.         MaskImage bimage,255,0,255 ; mask out pink color
104.         bx = x
105.         by = y
106.         bwidth = ImageWidth(image)
107.         bheight = ImageHeight(image)
108.         bid = id
109.         bstate = 0
110.  
111.         If centered Then bx = (GraphicsWidth()*.5) - (bwidth*.5) ;center on screen vertically
112.  
113.         Return b
114. End Function
115.  
116. Function updatebuttons()
117.         For b.button = Each button
118.                 If RectsOverlap(mx,my,1,1,  bx, by, bwidth, bheight)
119.                         If MouseDown(1) Then
120.                                 bstate = 1 ; button is being held down over button
121.                                 buttonheld = 1
122.                         Else
123.                                 bstate = 2 ; mouse is hovering over button with no button down
124.                                 If buttonheld = 1       ; was the button down last time? If so, mouse has just clicked up.
125.                                         ID_clicked = bid ;this button has been clicked. set to ID of clicked button
126.                                         buttonheld = 0  ;reset the button down value
127.                                 EndIf                                  
128.                         EndIf
129.                 Else            ; mouse is not over button
130.                         bstate = 0      ;normal state of button                        
131.                 EndIf
132.                
133.                 DrawImage       bimage,bx,by,bstate ; draw the button to screen
134.         Next
135. End Function
136.  
137. Function ButtonAction()
138.         ;Use this function to take action based on which button has been pressed. Each time you make a button, give it a unique ID.
139.         ;Then add a new case for that ID here.
140.         Select ID_clicked
141.                 Case 1
142.                         ;this button ID has been clicked. Do stuff here
143.                         info$ = "Button A has been clicked"
144.                                                
145.                 Case 2
146.                         ;this button ID has been clicked. Do stuff here
147.                         info$ = "Button B has been clicked"
148.  
149.                 Case 3
150.                         ;this button ID has been clicked. Do stuff here
151.                         info$ = "Centered button has been clicked"
152.  
153.                 Case 5
154.                         ;this button ID has been clicked. Do stuff here
155.                         info$ = "Image button has been pressed"
156.  
157.         End Select
158.  
159.         ID_clicked = -1
160.  
161. End Function

Comments :


Nate the Great(Posted 1+ years ago)

 hmmm... could be useful... thanks pongo!


pmc(Posted 1+ years ago)

 Exactly what I was looking for a couple of weeks ago. Thank you. I'll try it out.-pmc


_PJ_(Posted 1+ years ago)

 It's possible that the field ID is unnecessary - assuming that there isn't a requirement for duplicate id's.My reasoning is that as Type objects, the Handle() of each button instance can be used as the IDFurther savings on memory can be achieved by:Instead of maintaining a unique image for each especially if button images are either in multuple usage, or only ever Loaded once, Loading the correct images on creation of the first instance which uses it, but maintaining the image HANDLEs GLOBALLY could make this easier.incidentally, the Field for Image should not be declared as a string.The Position values can be stored as a single INT made of two SHORTS rather than two serparate INTSLikewiser for the Width/Height dimensions.


Yasha(Posted 1+ years ago)

 I don't think using the Handle as the ID really fits with what is going on here, because Handles are assigned at runtime and this is kinda reliant on the ID being known at compile-time so you can set up the Select structure accordingly. You can't rely on Handle returning a predetermined number, only that it will return some number; and therefore can't really rely on finding the right Case from it.