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unit unit_listbox;
{ On-screen keyboard with find object data function}
{ interface via global variables.}
{ Key functionality:
ESC --> close form with object_found=false
Enter --> find object, if not found show list of designations containing the input string
e.g. ngc2024 leave form with ngc2024 data. Object_found=true
ngc list all NGC objects
ngc 2024 list ngc2024 in the list
ngc10 leave form with ngc10 data. Object_found=true
ngc 10 list all objects containing ngc10 as ngc100, ngc1000, ngc1001...
ngc10* list all objects containing ngc10 as ngc100, ngc1000, ngc1001...
close form --> 2024 leave form with ngc2024 data if ngc was selected. Object_found=true
ngc2024 leave form with ngc2024 data. Object_found=true
abcdef leave form with abcdef designation. Object_found=false
}
{Copyright (C) 2017, 2024 by Han Kleijn, www.hnsky.org
email: han.k.. at...hnsky.org
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/. }
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls, Buttons,
unit_annotation {for deepsky database search};
type
{Tform_listbox1 }
Tform_listbox1 = class(TForm)
cancel1: TBitBtn;
ok1: TButton;
keyboard_question1: TLabel;
ListBox1: TListBox;
Edit1: TEdit;
procedure cancel1Click(Sender: TObject);
procedure ok1Click(Sender: TObject);
procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
procedure FormKeyPress(Sender: TObject; var Key: char);
procedure FormShow(Sender: TObject);
procedure ListBox1Click(Sender: TObject);
procedure ListBox1DblClick(Sender: TObject);
private
public
end;
var
form_listbox1: Tform_listbox1;
{global variables as interface}
keyboard_text : string;
object_found : boolean;
ra_data,dec_data, length_data, width_data, pa_data : double;
implementation
{$R *.lfm}
{ Tform_listbox1 }
uses
astap_main;
procedure Tform_listbox1.FormClose(Sender: TObject; var CloseAction: TCloseAction);
var
dummy : double;
error2: integer;
begin
if object_found=false then {form was closed by user. Initiate find action}
begin
keyboard_text:=edit1.text;
object_found:=find_object(keyboard_text ,ra_data,dec_data,length_data,width_data,pa_data);{keyboard_text with length less then 2 will be ignored}
end;
end;
procedure Tform_listbox1.FormKeyPress(Sender: TObject; var Key: char);
begin
if key=#27 {esc } then form_listbox1.close; {leave form}
if key=#13 {enter} then ok1click(Sender); {enter}
end;
procedure Tform_listbox1.FormShow(Sender: TObject);
begin
object_found:=false;
edit1.text:=keyboard_text;
end;
procedure Tform_listbox1.ListBox1Click(Sender: TObject);
begin
if (listbox1.itemindex)>=0 then {prevent error if nothing is selected}
edit1.text:=listbox1.Items[listbox1.itemindex];{copy selection to edit }
end;
procedure Tform_listbox1.ListBox1DblClick(Sender: TObject);
begin
if (listbox1.itemindex)>=0 then {prevent error if nothing is selected}
begin
keyboard_text:=listbox1.Items[listbox1.itemindex];{copy selection to edit }
if find_object(keyboard_text ,ra_data,dec_data,length_data,width_data,pa_data) {find object in unit u_annotation} then
begin
object_found:=true;
form_listbox1.close;
end
end;
end;
procedure fill_listbox(filterstr: string); {fill listbox with destinations containing the filterstr}
var
ra0,dec0,length0,width0,pa : double; {dummies, not used}
begin
load_deep;{Load the deepsky database once. If already loaded, no action}
linepos:=2;{Set pointer to the beginning}
with form_listbox1 do
begin
if length(filterstr)>1 then
begin
listbox1.Clear; { empty the list of any old values }
while read_deepsky('T' {full database search} ,0 {ra},0 {dec},1 {cos(telescope_dec)},2*pi{fov},{var} ra0,dec0,length0,width0,pa) {Deepsky database search} do
begin
if ((length(filterstr)=0) or (pos(filterstr,uppercase(naam2))>0)) then
listbox1.Items.Add(naam2);
if ((length(naam3)>0) and (((length(filterstr)=0) or (pos(filterstr,uppercase(naam3))>0)))) then
listbox1.Items.Add(naam3);
if ((length(naam4)>0) and (((length(filterstr)=0) or (pos(filterstr,uppercase(naam4))>0)))) then
listbox1.Items.Add(naam4);
end;{while loop}
edit1.text:='';{clear filtering}
ActiveControl:=listbox1;{set focus on listbox1 text window}
end;
end;
end;
procedure Tform_listbox1.ok1Click(Sender: TObject);
begin
Screen.Cursor:=crHourglass;{$IfDef Darwin}{$else}application.processmessages;{$endif}// Show hourglass cursor, processmessages is for Linux. Note in MacOS processmessages disturbs events keypress for lv_left, lv_right key
keyboard_text:=edit1.text;
if find_object(keyboard_text ,ra_data,dec_data,length_data,width_data,pa_data) {find object in unit u_annotation} then
begin
object_found:=true;
form_listbox1.close;
end
else
begin {keyboard_text with length less then 2 or not found}
if decode_string(keyboard_text,ra_data,dec_data) {convert a string to position succesfull} then
begin
object_found:=true;
form_listbox1.close;
end;
keyboard_text:=StringReplace(uppercase(keyboard_text), ' ', '',[rfReplaceAll]);{replace all space and make upcase}
keyboard_text:=StringReplace(keyboard_text, '*', '',[rfReplaceAll]);{remove wildchard}
fill_listbox(keyboard_text);{fill listbox with suggestions}
end;
Screen.Cursor:=crDefault;
end;
procedure Tform_listbox1.cancel1Click(Sender: TObject);
begin
object_found:=false;
form_listbox1.close;
end;
end.
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