input.anubis
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The Anubis/Paradize Project.
The input widget.
Copyright (c) Alain Prouté 2004-2005.
Authors: Alain Prouté
Olivier Duvernois
read widget.anubis
read tools.anubis
In this file, the 'input' widget is defined. The global term 'input' covers three
'inputs' :
. the text-input, for any alphanumeric characters;
. the integer-input, for integer number;
. the float-input, for float number.
*** The style
The input is a rectangle where characters are written and it is possible to move a
caret all along this captured text. Hence, for drawing it, we need the following data :
(1) a background color,
(2) a font size,
(3) a font color,
(4) a caret color,
(5) the width for the input.
Use the type 'IntputStyle' to set those parameters. The parameters 1, 2 and 3 can be
retrieve from WidgetParameters (see tools.anubis) with the alternative
'input_common_style', or define by the user with then alernative 'input_style'.
public type InputStyle:
input_common_style
(
WidgetParameters parms,
Int32 width // total width of input-from in pixel
).
*** The graphic aspect
The size of the input will be :
. width = as defined in InputStyle
. height = total font height + 1, to have a line between the character and the
border of the input.
The caret, when the input is not active, is a empty rectangle (a background-color line
arrounded by a caret-color thin-lin). When the input is active, the caret is just a
vertical stroke. When several characters are selected, they are written on a rectangle
(color : lighten caret color) and their color moves to darken.
*** The three input
public define Widget
create_text_input
(
InputStyle style_of_input_widget,
Var(String) text_location_with_initial_value
).
public define Widget
create_integer_input
(
InputStyle style_of_input_widget,
Var(Int32) integer_location_with_initial_value
).
public define Widget
create_float_input
(
InputStyle style_of_input_widget,
Var(Float) float_location_with_initial_value,
Int32 number_of_decimals
).
--- That's all for the public part ! --------------------------------------------------
*** (1) Tools
*** (1.1) Retrieve data from the style
*** (1.2) Caret Position
*** (1.3) The input rectangle
*** (2) Caret
*** (3) DrawParameters
*** (4) Compute the visible text in the input
*** (5) Initialize DrawParameters
*** (6) Special keys answer
*** (6.1) Remove character(s)
*** (6.2) Backspace Answer
*** (6.3) Home Answer
*** (6.4) End Answer
*** (6.5) Del Answer
*** (6.6) Left Answer
*** (6.7) Right Answer
*** (6.8) Special keys answer manager
*** (7) Input event handler
*** (7.1) Main function
*** (7.2) Compute caret position after a left.click.
*** (7.3) Keyboard Answer
*** (7.4) Insert character(s)
*** (8) The widget
*** (8.1) Create input form
*** (8.2) Draw the selection rectangle
*** (8.3) Write the characters
*** (1) Tools
*** (1.1) Retrieve data from the style
define RGB
font_color
(
InputStyle ifs
) =
if ifs is
{
input_common_style(p,_) then *font_color_v(p)
}.
define RGB
caret_color
(
InputStyle ifs
) =
if ifs is
{
input_common_style(p,_) then *caret_color_v(p)
}.
*** (1.2) Caret Position
Compute the position (in pixels) of the caret from the left of the visible text
define Int32
x_caret
(
String vc,
Int32 nvc,
InputStyle ifs
) =
if sub_string(vc,0,nvc) is
{
failure then 0,
success(s) then
max(if ifs is
{
input_common_style(p,_) then printed_text_width(*font_v(p),s)
}-1,0)
}.
*** (1.3) The input rectangle
This rectangle draws the input, where characters are written. It is used in the
create-widget defintion, and for redrawing after a keyboard event.
define WidgetRectangle
input_rect
(
InputStyle ifs
) =
if ifs is
{
input_common_style(p,w) then
with fi = get_font_info(*font_v(p)),
rect(0,0,w,word8_to_Word32(height(fi))+word8_to_Word32(depth(fi))+1),
}.
*** (2) Caret
Caret has two aspects, depends on if several characters aer selected (-> rectangle) or
not (-> stroke). The value of Caret moves, if it's necessary, after keyboards event.
type Caret:
stroke
(
String vc, // characters visible in the input
Int32 nvc, // number of visible characters at the left of caret: 0=< n =< length(vc)
Int32 nlc // number of invisible characters on the left side of then input
),
rectangle
(
String vc,
Int32 nvc,
Int32 nlc,
Int32 nsc, // number of selected characters : nsc-1 when left key, nsc+1 when right key
Int32 bc // number of characters (visible and hidden on the left of the input)
// when selection begins.
).
*** (3) DrawParameters
DrawParameters is a 'tool' type. It is used to keep in memory drawing parameters and to
define drawing functions used to manage keyboard events.
with :
visu_text = function computing the visible text (and how many characters will be
appears) from the number of invisible characters on the left side of
the input and the all_text.
answer = only the alternative 'handled' with the input-rectangle defined above.
type DrawParameters:
draw_parms
(
SystemFont font,
Int32 total_font_height,
Int32 width,
Word8 -> Int32 char_size,
WidgetAnswer answer,
(Int32,String) -> Maybe((String,Int32)) mb_visu_text,
(String -> Int32) text_width, // in pixels
WidgetRectangle input_rect
).
*** (4) Compute the visible text in the input
This function gives :
. the visible text,
. the length in pixels of this text,
. the number of characters of this text
When the caret will on the very right of the all text, it's necessary to compute it
from the end of the all text. So the boolan 'reversing'.
define (List(Word8),Int32,Int32)
compute_visible_text
(
List(Word8) all_text,
Int32 max,
Word8 -> Int32 char_size,
List(Word8) visu_text,
Int32 visu_length,
Int32 visu_nb
) =
if all_text is
{
[] then (visu_text,visu_length,visu_nb),
[h . t] then
with new_vl = visu_length+char_size(h),
if new_vl > max
then (visu_text,visu_length,visu_nb)
else compute_visible_text(t,max,char_size,[h . visu_text],new_vl,visu_nb+1)
}.
define (String,Int32,Int32)
compute_visible_text
(
String all_text,
DrawParameters dparms,
Bool reversing
) =
if compute_visible_text
(if reversing then reverse(explode(all_text)) else explode(all_text),
width(dparms)-2,char_size(dparms),[],0,0) is (visu_text,visu_length,visu_nb)
then if reversing then (implode(visu_text),visu_length,visu_nb)
else (implode(reverse(visu_text)),visu_length,visu_nb).
*** (5) Initialize DrawParameters
define Maybe((String,Int32))
new_visible_text
(
Int32 nlc,
String all_text,
Int32 max,
Word8 -> Int32 char_size,
) =
if sub_string(all_text,nlc,length(all_text)-nlc) is
{
failure then failure,
success(s) then
if compute_visible_text(explode(s),max,char_size,[],0,0) is (l,_,n)
then success((implode(reverse(l)),n))
}.
define DrawParameters
to_draw_parms
(
InputStyle ifs
) =
if ifs is
{
input_common_style(p,w) then
with fi = get_font_info(*font_v(p)),
char_size = (Word8 c) |-> word8_to_Word32(width(get_char_info(*font_v(p),c))),
ir = input_rect(ifs),
draw_parms(*font_v(p),word8_to_Word32(height(fi))+word8_to_Word32(depth(fi)),
w,char_size, handled([ir]),
(Int32 nlc,String all) |-> new_visible_text(nlc,all,w,char_size),
(String s) |-> printed_text_width(*font_v(p),s),
ir
)
}.
*** (6) Special keys answer
*** (6.1) Remove character(s)
define WidgetAnswer
remove_character
(
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms,
Int32 nb_left, // nb of characters at the left of caret (or selection) from all_text
Int32 nsc,
Int32 new_nvc
) =
with lt = if sub_string(*all_text,0,nb_left) is
{
failure then "",
success(s) then s
},
rt = if sub_string(*all_text,nb_left+abs(nsc), length(*all_text)-nb_left-abs(nsc)) is
{
failure then "",
success(s) then s
},
(
all_text <- lt+rt;
caret <- if *caret is
{
stroke(vc,nvc,nlc) then
with new_nlc = max(0,nlc-(if nvc=0 then 1 else 0)),
if mb_visu_text(dparms)(new_nlc,*all_text) is
{
failure then stroke("",max(0,nvc-1),new_nlc),
success(s) then if s is (new_vc,nb_vc) then
stroke(new_vc,new_nvc,new_nlc)
},
rectangle(vc,nvc,nlc,nsc,bg) then
with new_nlc = max(0,nlc-(if nvc-max(0,nsc)=<0 then nvc-max(0,nsc) else 0)),
if mb_visu_text(dparms)(new_nlc,*all_text) is
{
failure then stroke("",max(0,nvc),new_nlc),
success(s) then if s is (new_vc,nb_vc) then
stroke(new_vc,new_nvc,new_nlc)
}
}
); answer(dparms).
*** (6.2) Backspace Answer
define WidgetAnswer
backspace_answer
(
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
if *caret is
{
stroke(vc,nvc,nlc) then
remove_character(all_text,caret,dparms,nlc+nvc-1,1,nvc-1),
rectangle(vc,nvc,nlc,nsc,bc) then
remove_character(all_text,caret,dparms,nlc+nvc-max(0,nsc),nsc,max(0,nvc-max(0,nsc))),
}.
*** (6.3) Home Answer
define WidgetAnswer
home_answer
(
KeyboardState ks,
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
if nvc(*caret)=0 & nlc(*caret)=0 then not_handled([]) /* it's already home */
else if shift(ks)
then if *caret is
{
stroke(vc,nvc,nlc) then
caret <- if mb_visu_text(dparms)(0,*all_text) is
{
failure then rectangle("",0,0,-nlc-nvc,nlc+nvc),
success(s) then if s is (vc,_) then rectangle(vc,0,0,-nlc-nvc,nlc+nvc)
}; answer(dparms)
rectangle(vc,nvc,lvc,nsc,bc) then
caret <- if mb_visu_text(dparms)(0,*all_text) is
{
failure then rectangle(vc,0,0,-lvc-nvc+min(0,nsc),bc),
success(s) then if s is (new_vc,_)
then rectangle(vc,0,0,-lvc-nvc+min(0,nsc),bc)
}; answer(dparms)
}
else caret <- if mb_visu_text(dparms)(0,*all_text) is
{
failure then stroke("",0,0),
success(s) then if s is (vc,_) then stroke(vc,0,0)
}; answer(dparms).
*** (6.4) End Answer
define WidgetAnswer
end_answer
(
KeyboardState ks,
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
with n = length(*all_text),
if nvc(*caret)+nlc(*caret)=n /* it's already the end */
then not_handled([])
else
(if compute_visible_text(*all_text,dparms,true) is (new_vc,_,new_nvc) then
if shift(ks)
then if *caret is
{
stroke(vc,lvc,nvc) then
caret <- rectangle(new_vc,new_nvc,n-new_nvc,length(*all_text)-lvc-nvc,nvc),
rectangle(vc,lvc,nvc,nsc,bc) then
caret <- rectangle(new_vc,new_nvc,n-new_nvc,length(*all_text)-lvc-nvc+nsc,bc)
}
else caret <- stroke(new_vc,new_nvc,n-new_nvc)
); answer(dparms).
*** (6.5) Del Answer
define WidgetAnswer
del_answer
(
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
if *caret is
{
stroke(vc,nvc,nlc) then
remove_character(all_text,caret,dparms,nlc+nvc,1,nvc),
rectangle(vc,nvc,nlc,nsc,bc) then
remove_character(all_text,caret,dparms,nlc+nvc-max(0,nsc),nsc,max(0,nvc-max(0,nsc))),
}.
*** (6.6) Left Answer
define WidgetAnswer
left_answer
(
Var(String) all_text,
DrawParameters dparms,
String vc,
Int32 nvc,
Int32 nlc,
Int32 nsc,
Int32 bc,
(String,Int32,Int32,Int32,Int32) -> One new_caret
) =
if nvc=0 & nlc=0 then not_handled([]) /* caret at far-left and no more invisible characters */
else if nvc=0 & nlc>0 /* caret at far-left, and there is at least 1 invisible characters */
then if mb_visu_text(dparms)(nlc-1,*all_text) is
{
failure then not_handled([]),
success(s) then
if s is (new_vc,_) then new_caret(new_vc,0,nlc-1,nsc-1,bc); answer(dparms)
}
else new_caret(vc,nvc-1,nlc,nsc-1,bc);answer(dparms).
define WidgetAnswer
left_answer
(
KeyboardState ks,
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
if shift(ks)
then /* shift is down */
if *caret is
{
stroke(vc,nvc,nlc) then
left_answer(all_text,dparms,vc,nvc,nlc,0,nvc,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- rectangle(_vc,_nvc,_nlc,_nsc,_bc)),
rectangle(vc,nvc,nlc,nsc,bc) then
left_answer(all_text,dparms,vc,nvc,nlc,nsc,bc,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- if nsc-1=0
then stroke(_vc,_nvc,_nlc)
else rectangle(_vc,_nvc,_nlc,_nsc,_bc)),
}
else /* shift is up */
/* The answer is equal for the both alternative of caret */
left_answer(all_text,dparms,vc(*caret),nvc(*caret),nlc(*caret),0,0,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- stroke(_vc,_nvc,_nlc)).
*** (6.7) Right Answer
define WidgetAnswer
right_answer
(
Var(String) all_text,
DrawParameters dparms,
String vc,
Int32 nvc,
Int32 nlc,
Int32 nsc,
Int32 bc,
(String,Int32,Int32,Int32,Int32) -> One new_caret
) =
if nvc+nlc=length(*all_text) then not_handled([]) /* no more characters at right */
else if nvc=length(vc) /* caret is at the right of the visible text */
/* => re-compute the visible text with one more invisible character at left*/
then if mb_visu_text(dparms)(nlc+1,*all_text) is
{
failure then not_handled([]),
success(s) then if s is (new_vc,new_nvc)
then new_caret(new_vc,new_nvc,nlc+1,nsc+1,bc); answer(dparms),
}
else new_caret(vc,nvc+1,nlc,nsc+1,bc); answer(dparms).
define WidgetAnswer
right_answer
(
KeyboardState ks,
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms
) =
if shift(ks)
then /* shift is down */
if *caret is
{
stroke(vc,nvc,nlc) then
right_answer(all_text,dparms,vc,nvc,nlc,0,nvc,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- rectangle(_vc,_nvc,_nlc,_nsc,_bc)),
rectangle(vc,nvc,nlc,nsc,bc) then
right_answer(all_text,dparms,vc,nvc,nlc,nsc,nvc,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- if nsc+1=0
then stroke(_vc,_nvc,_nlc)
else rectangle(_vc,_nvc,_nlc,_nsc,_bc)),
}
else /* shift is up */
/* The answer is equal for the both alternative of caret */
right_answer(all_text,dparms,vc(*caret),nvc(*caret),nlc(*caret),0,0,
(String _vc,Int32 _nvc,Int32 _nlc,Int32 _nsc,Int32 _bc) |->
caret <- stroke(_vc,_nvc,_nlc)).
*** (6.8) Special keys answer manager
define WidgetAnswer
keyboard_special_key_answer
(
KeyboardState ks,
KeyboardSpecialKey ksk,
Var(String) all_text,
Var(Bool) inser,
Var(Caret) caret,
DrawParameters dparms
) =
if ksk is
{
escape then not_handled([]),
f1 then not_handled([]),
f2 then not_handled([]),
f3 then not_handled([]),
f4 then not_handled([]),
f5 then not_handled([]),
f6 then not_handled([]),
f7 then not_handled([]),
f8 then not_handled([]),
f9 then not_handled([]),
f10 then not_handled([]),
backspace then backspace_answer(all_text,caret,dparms),
home then home_answer(ks,all_text,caret,dparms),
end then end_answer(ks,all_text,caret,dparms),
tab then not_handled([]),
enter then not_handled([]),
insert then (inser <- not(*inser)); not_handled([]),
del then del_answer(all_text,caret,dparms),
page_up then not_handled([]),
page_down then not_handled([]),
up then not_handled([]),
down then not_handled([]),
left then left_answer(ks,all_text,caret,dparms),
right then right_answer(ks,all_text,caret,dparms)
}.
*** (7) Input event handler
*** (7.4) Insert character(s)
define WidgetAnswer
insert_character
(
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms,
Word8 new_char,
Int32 nb_left, //
Int32 nsc
) =
with lt = if sub_string(*all_text,0,nb_left) is
{
failure then "",
success(s) then s
},
rt = if sub_string(*all_text,nb_left+abs(nsc), length(*all_text)-nb_left-abs(nsc)) is
{
failure then "",
success(s) then s
},
(all_text <- lt+implode([new_char])+rt;
if text_width(dparms)(vc(*caret)+implode([new_char])) >= width(dparms)
then /* With the new character, the current visible text is wider than the width of the */
/* input. Two cases must be checked : */
/* (1) the caret is far-right of the input */
/* (2) the caret is in the middle of the input_form */
if nvc(*caret)=length(vc(*caret))
then (if compute_visible_text(*all_text,dparms,true) is (new_vc,vc_length,new_nvc) then
caret <- stroke(new_vc,new_nvc,length(*all_text)-new_nvc))
else
caret <- if mb_visu_text(dparms)(nlc(*caret)+1,*all_text) is
{
failure then stroke(*all_text,nvc(*caret)+1,nlc(*caret)),
success(s) then if s is (new_vc,nb_vc) then
(print("new_vc="+new_vc+"\n");
stroke(new_vc,nvc(*caret),nlc(*caret)+1))
}
else /* With the new character, current visible text is still smaller than the width of the */
/* input */
caret <- if mb_visu_text(dparms)(nlc(*caret),*all_text) is
{
failure then stroke(*all_text,nvc(*caret)+1,nlc(*caret)),
success(s) then if s is (new_vc,nb_vc) then
stroke(new_vc,min(nvc(*caret)+1-max(0,nsc),nb_vc),nlc(*caret))
});
answer(dparms).
*** (7.3) Keyboard Answer
define WidgetAnswer
keyboard_answer
(
(Word8,String) -> Bool ok_chars,
Var(String) all_text,
Var(Caret) caret,
Var(Bool) inser,
DrawParameters dparms,
KeyboardState ks,
KeyboardKey k
) =
if k is
{
unknown then not_handled([]),
char(c) then
if ok_chars(c,*all_text)
then
if *inser
then
if *caret is
{
stroke(vc,nvc,nlc) then
insert_character(all_text,caret,dparms,c,nlc+nvc,0),
rectangle(vc,nvc,nlc,nsc,bc) then
insert_character(all_text,caret,dparms,c,nlc+nvc-max(0,nsc),nsc),
}
else /* Overwrite */
/* --------- */
/* Substitute the character at the left of the caret by the new one. */
/* When the caret is a stroke, it's the same effect than a selection of */
/* one character with the right arrow. */
if *caret is
{
stroke(vc,nvc,nlc) then
insert_character(all_text,caret,dparms,c,nlc+nvc-1,1),
rectangle(vc,nvc,nlc,nsc,bc) then
insert_character(all_text,caret,dparms,c,nlc+nvc-max(0,nsc),nsc),
}
else not_handled([]), /* ok_chars=false */
unicode(_,_) then alert,
special(ksk) then keyboard_special_key_answer(ks,ksk,all_text,inser,caret,dparms)
}.
define One
input_capture_keyboard
(
WidgetEventToolBox etb,
(Word8,String) -> Bool ok_caracters,
Var(One -> Bool) still_captured,
Var(String) all_text,
Var(Caret) caret,
Var(Bool) inser,
DrawParameters dparms
) =
still_captured <-
capture_keyboard
(
etb,
(KeyboardState ks, KeyboardKey k) |->
keyboard_answer(ok_caracters,all_text,caret,inser,dparms,ks,k),
(List(WidgetRectangle) -> One redraw) |-> redraw([input_rect(dparms)])).
*** (7.2) Compute caret position after a left-click.
The purpose is to put the caret on the glue between 2 letters and to avoid to see it
on a letter. The final position will be on the left side of the letter if the click
occured on the left-half of the letter, on the right side if it was on the right-half.
define Int32
caret_position
(
Int32 mx, // mouse x
List(Word8) text, // visible text, not necessary all
Int32 pos, // position in pixels of the caret
Int32 nb_char, // initialize at 0
Word8 -> Int32 char_w,
) =
if text is
{
[] then nb_char,
[h . t] then
with new_pos = pos+char_w(h),
new_pos2 = pos+(char_w(h)/2),
if mx < new_pos2 then nb_char
else if mx < new_pos then nb_char+1
else caret_position(mx,t,new_pos,nb_char+1,char_w)
}.
*** (7.1) Main function
define (KeyboardState ks, WidgetMouseCapturedEvent e) -> WidgetAnswer
mouse_captured_handler
(
Var(String) all_text,
Var(Caret) caret,
DrawParameters dparms,
Int32 mx,
) =
(KeyboardState ks, WidgetMouseCapturedEvent e) |->
if e is
{
moved(x,y) then
if x=<0 & nlc(*caret)=0 then not_handled([])
else if x=<0 & nlc(*caret)>0 then
if mb_visu_text(dparms)(nlc(*caret)-1,*all_text) is
{
failure then not_handled([]),
success(s) then if s is (new_vc,_) then
caret <- if *caret is
{
stroke(vc,nvc,nlc) then rectangle(new_vc,0,nlc-1,-1,nvc),
rectangle(vc,nvc,nlc,nsc,bc) then rectangle(new_vc,0,nlc-1,nsc-1,bc)
}; answer(dparms)
}
else if x>=width(dparms) & nlc(*caret)+length(vc(*caret))=length(*all_text)
then not_handled([])
else if x>=width(dparms) & nvc(*caret)=length(vc(*caret)) then
(if mb_visu_text(dparms)(nlc(*caret)+1,*all_text) is
{
failure then not_handled([]),
success(s) then if s is (new_vc,new_nvc) then
caret <- if *caret is
{
stroke(vc,nvc,nlc) then rectangle(new_vc,new_nvc,nlc+1,1,nvc),
rectangle(vc,nv,nlc,nsc,bc) then rectangle(new_vc,new_nvc,nlc+1,nsc+1,bc)
}; answer(dparms)
})
else(with cp=if *caret is
{
stroke(_,nvc,_) then
caret_position(mx,explode(vc(*caret)),0,0,char_size(dparms)),
rectangle(_,nvc,_,nsc,_) then nvc
},
ptw=caret_position(x,explode(vc(*caret)),0,0,char_size(dparms)),
if cp=ptw then not_handled([])
else if ptw>cp then
caret <- if *caret is
{
stroke(vc,nvc,nlc) then rectangle(vc,nvc+1,nlc,1,nvc),
rectangle(vc,nvc,nlc,nsc,bc) then rectangle(vc,nvc+1,nlc,nsc+1,bc),
};answer(dparms)
else /* x<ptw */
caret <- if *caret is
{
stroke(vc,nvc,nlc) then rectangle(vc,nvc-1,nlc,-1,nvc),
rectangle(vc,nvc,nlc,nsc,bc) then rectangle(vc,nvc-1,nlc,nsc-1,bc),
};answer(dparms)),
liberated(x,y) then not_handled([])
}.
define WidgetAnswer
input_form_handler
(
WidgetEventToolBox etb,
WidgetNormalEvent e,
(Word8,String) -> Bool ok_caracters,
Var(One -> Bool) still_captured,
Var(String) all_text,
Var(Caret) caret,
Var(Bool) inser,
DrawParameters dparms
) =
if e is
{
mouse_gone then not_handled([]),
mouse_move(ks,_,_) then not_handled([]),
mouse_click(ks,mc,mx,my) then
if mc is
{
left_down then
caret <- stroke(vc(*caret),
caret_position(mx,explode(vc(*caret)),0,0,char_size(dparms)),
nlc(*caret));
input_capture_keyboard(etb,ok_caracters,still_captured,all_text,caret,inser,dparms);
forget(capture_mouse(etb,mouse_captured_handler(all_text,caret,dparms,mx)));
answer(dparms),
left_up then not_handled([]),
middle_down then not_handled([]),
middle_up then not_handled([]),
right_down then not_handled([]),
right_up then not_handled([])
}
}.
*** (8) The widget
*** (8.3) Write the characters
define Int32
write_text
(
WidgetDrawToolBox dtb,
InputStyle ifs,
String visu_text
) =
if ifs is
{
input_common_style(p,_) then
with fs = *font_v(p),
draw(dtb)(visu_text,fs,*font_color_v(p),
position(0,word8_to_Word32(height(get_font_info(fs))))),
}.
*** (8.2) Draw the selection rectangle
define One
draw_selection_rectangle
(
WidgetDrawToolBox dtb,
String vc,
Int32 nvc,
Int32 nsc,
DrawParameters dparms,
RGB caret_color,
RGB font_color
) =
if sub_string(vc,max(0,nvc-max(0,nsc)),min(abs(nsc),length(vc))) is
{
failure then unique,
success(sel_chars) then
with left_pos= if sub_string(vc,0,nvc-max(0,nsc)) is
{
failure then 0,
success(s) then text_width(dparms)(s),
},
draw(dtb)(rect(left_pos,1,left_pos+text_width(dparms)(sel_chars),total_font_height(dparms)),
lighten(caret_color));
forget(draw(dtb)(sel_chars,font(dparms),darken(font_color),
position(left_pos,
word8_to_Word32(height(get_font_info(font(dparms)))))))
}.
*** (8.1) Create input
define Widget
create_input
(
InputStyle ifs,
Var(String) all_text,
(Word8,String) -> Bool ok_chars
) =
with /* true means that insert is running */
inser = var((Bool) true),
/* to check if the text-input is active or not and drawing the caret */
still_captured = var((One -> Bool) (One u) |-> false),
/* initialize caret value : as the visible text is computed reversing the all_text, */
/* the number of invisible characters on the left_side of the input is the */
/* difference between the length of the both string all-text and visible-text */
caret =
if compute_visible_text(*all_text,to_draw_parms(ifs),true) is (visu_text,visu_length,_) then
with lvt = length(visu_text),
var((Caret) stroke(visu_text,lvt,length(*all_text)-lvt)),
create_widget(
/* set child positions */
(WidgetPositionToolBox ptb) |-> unique,
/* get_size */
(One u) |-> (width(ifs),
if ifs is
{
input_common_style(p,_) then
with fi = get_font_info(*font_v(p)),
word8_to_Word32(height(fi))+word8_to_Word32(depth(fi)),
}+1),
/* redraw */
(WidgetDrawToolBox dtb) |->
draw(dtb)(input_rect(ifs),
if ifs is
{
input_common_style(p,_) then *background_color_v(p)
});
forget(write_text(dtb,ifs,vc(*caret)));
with data =
if ifs is
{
input_common_style(p,_) then
with fi = get_font_info(*font_v(p)),
(word8_to_Word32(height(fi))+word8_to_Word32(depth(fi)),*background_color_v(p))
},
if data is (total_font_height,bg_color) then
(if (*still_captured)(unique)
then
if *caret is
{
stroke(vc,nvc,nlc) then
with x_caret = x_caret(vc,nvc,ifs),
draw(dtb)(rect(x_caret,1,x_caret+1,total_font_height),caret_color(ifs)),
rectangle(vc,nvc,nlc,nsc,bc) then
draw_selection_rectangle
(dtb,vc,nvc,nsc,to_draw_parms(ifs),caret_color(ifs),font_color(ifs))
}
else
if compute_visible_text(*all_text,to_draw_parms(ifs),false) is (_,visu_length,_) then
// draw(dtb)(rect(visu_length+1,1,visu_length+2,total_font_height),lighten(caret_color(ifs)))
(draw(dtb)(rect(visu_length+1,1,visu_length+4,total_font_height),caret_color(ifs));
draw(dtb)(rect(visu_length+2,2,visu_length+3,total_font_height-1),bg_color))
),
/* duplicate */
(One u) |-> create_input(ifs,all_text,ok_chars),
/* Change size */
(Int32 w, Int32 h) |-> unique,
/* event handling */
(WidgetEventToolBox etb, WidgetNormalEvent e) |->
input_form_handler(etb,e,ok_chars,still_captured,all_text,caret,inser,to_draw_parms(ifs)),
/* monitoring */
(List(WidgetRegistration)) []
).
public define Widget
create_text_input
(
InputStyle ifs,
Var(String) t
) =
create_input(ifs,t,(Word8 c, String s) |-> true).
define Bool
integer_characters
(
Word8 c
) =
with _c = word8_to_Word32(c),
(48 =< _c) & (_c =< 57).
public define Widget
create_integer_input
(
InputStyle ifs,
Var(Int32) i
) =
create_input(ifs,var((String) integer_to_string(*i)),(Word8 c,String s) |-> integer_characters(c)).
define Bool
float_characters
(
Word8 c,
String s
) =
with _c = word8_to_Word32(c),
( (48 =< _c) & (_c =< 57) )
| (if c = ',' | c = '.'
then (not(member(',',s)) & not(member('.',s)))
else false).
public define Widget
create_float_input
(
InputStyle ifs,
Var(Float) f,
Int32 n // the number of decimals
) =
create_input(ifs,var((String) float_to_string(*f,n)),(Word8 c,String s) |-> float_characters(c,s)).