HODISALARI - Информатика

HODISALARI
OnActivate
Aktiv bo`lganda
OnClick
Sichqoncha bosilganda
OnClose
Yopilganda
OnCreate
Yaratilganda
OnDblClick
Sichqoncha 2 marta bosilganda
OnHide
Yoshiringanda
OnKeyPress
Tugma bosilganga
OnShow
Chaqirilganda
Formning qolgan xossa va hodisalar bilan keyinroq tanishamiz. Form bilan
bitta misol ko`rib chiqaylik. Masalan, Oynaning sarlavhasida ―Birinchi oynam‖,
ekranning o`rtasidan, oq rangli, balandligi 250, uzunligi 250 o`lchamda,
yaratilganda ―Oyna yaratildi‖, yopilganda ―Oyna yopiladi‖, sichqoncha bir marta
bosilsa, ―Sichqoncha bosildi‖, sichqoncha ikki marta bosilsa, ―Sichqoncha ikki
marta bosildi‖ degan muloqot oynalarini chiqaruvchi oyna yaratishni olamiz.
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C++ Builder dasturi ishga tushirilgan va bir loyiha tayorlangan bo`lsa, uni
xotiraga olib (save all), so`ng barcha loyihalarni yopamiz (close all). Yangi loyiha
yaratamiz (file->New Application).
1.
Form sarlavhasida yozish uchun Object Inspector oynasidan properties
bo`limiga o`tib, caption ―Birinchi oynam‖ matnini yozamiz;
2.
Position ga o`tib, uni poScreenCenter ga tenglashtiramiz;
3.
Color ni oq rangni (clWindow) tanlaymiz;
4.
Height ning qiymatiga 250,Width ning qiymatiga 250 ni kiritamiz;
5.
Object Inspector oynasidan events bo`limiga o`tib, OnCreate o`ng tomoniga
ikki marta sichqonchani bosib, void __fastcall TForm1:: FormCreate ( TObject
*Sender ) protsedurasiga ShowMessage ( "Oyna yaratildi " ); matni kiritiladi.
ShowMessage ekranda xabarlarni chiqaradi;
6.
OnClose o`ng tomoniga ikki marta sichqonchani bosib, void __fastcall TForm1
:: FormClose ( TObject *Sender, TCloseAction &Action ) protsedurasiga
ShowMessage ( " Oyna yopiladi " ); matnni kiritiladi;
7.
OnClick o`ng tomoniga ikki marta sichqonchani bosib, void __fastcall TForm1
:: FormClick (TObject *Sender) protsedurasiga ShowMessage ("Sichqoncha
bosildi" ); matnni kiritiladi;
8.
OnDblClick o`ng tomoniga ikki marta sichqonchani bosib, void __fastcall
TForm1 :: FormDblClick (TObject *Sender) protsedurasiga ShowMessage
("Sichqoncha ikki marta bosildi"); matnni kiritiladi;
Shunday qilib, berilgan vazifa bajarildi. [F9] tugmasi bosib, dasturni
tekshiramiz va ishlatamiz. Yuqoridagi 1,2,3 va 4 larni operatorlar bilan kiritsa
bo`ladi. Buning uchun Object Inspector oynasidan events bo`limiga o`tib,
OnCreate o`ng tomoniga ikki marta sichqonchani bosib, void __fastcall TForm1::
FormCreate ( TObject *Sender ) prosedurasiga quyidagi listing kiritiladi.
6.3-listing
Caption="Birinchi oynam";
Position=poScreenCenter;
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Color=clWindow;
Height=250;
Width=250;
Bu misolning umumiy listing kodi quyidagicha:
6.4-listing
//---------------------------------------------------------------------------
#include
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{ }
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{ Caption="Birinchi oynam";
Position=poScreenCenter;
Color=clWindow;
Height=250;
Width=250;
ShowMessage("oyna yaratildi"); }
//---------------------------------------------------------------------------
void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{ ShowMessage("Oyna yopilladi") ; }
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//---------------------------------------------------------------------------
void __fastcall TForm1::FormClick(TObject *Sender)
{ ShowMessage("Sichqoncha bosildi");}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDblClick(TObject *Sender)
{ ShowMessage("Sichqoncha ikki marta bosildi"); }
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