www.pudn.com > dos_gui.zip > LISTSCRL.CPP

// 1993 (c) ALL RIGHTS RESERVED 
// AUTHOR:  XuYongYong 
 
/* listscrl.cpp 
   a group with a listbox & a scroll 
*/ 
 
#include "listscrl.h" 
 
/**************************************************************************/ 
listscrl_class::listscrl_class(int ID,char *title_hotkey, 
		int left,int top,int width,int height, 
		int string_num, char ** thestring_list) 
	:	group_class(ID,title_hotkey,left,top,width,height) 
// gruop 's min current max value is always 0 
{ 
	title_pos_x =left ; 
	title_pos_y =top -bar_height-1; 
 
	listbox =new Tlistbox ( ((ID<<8)|222),"",left,top,width-bar_height,height,-1,-1, 
		string_num,thestring_list); 
	scroll  =new Tscroll  ( ((ID<<8)|111),"",left+width-bar_height,top,bar_height,height, 
		0,( (string_num>1)?string_num-1:1),0); 
	insert_control (listbox); 
	insert_control (scroll); 
} 
 
void listscrl_class::setup_control(  ) 
{  // outer changed listbox 's max_value ; that's enough 
	scroll ->max_value =listbox ->max_value ; 
	if (scroll->max_value<1) scroll->max_value =1; //min is 0 
 
	scroll ->current_value =listbox ->current_value ; 
	if (scroll->current_value<0 ) scroll->current_value =0; 
	// can only used here 
	listbox->setup_control( ); 
	scroll ->setup_control( ); 
} 
/**************************************************************************/ 
void listscrl_class::select ( ) 
{ 
	listbox->select(); 
	scroll ->select(); 
} 
 
/**************************************************************************/ 
void listscrl_class::unselect ( ) 
{ 
	listbox->unselect(); 
	scroll ->unselect(); 
} 
 
/**************************************************************************/ 
int listscrl_class::key_pressed_handler   	(int key_scan_num ) 
{ 
	return listbox->key_pressed_handler(key_scan_num); 
} 
 
int listscrl_class::msg_handler (MSG& message) 
{ 
  static int flag=0; 
 
	switch (message.Action) { 
		case ListBoxValueChangedMSG: 
//			if ( (message.ID & 0xFF)==222) { 
			if ( message.fptr==listbox) { 
//				if (flag !=2){ 
					if (scroll->current_value !=listbox->current_value) 
						scroll->control_change_value(listbox->current_value); 
//					flag =1; 
//				} 
				return TRUE; //maybe FALSE 
			} 
		case ScrollValueChangedMSG: 
			if (message.fptr==scroll) { 
//				if (flag !=1){ 
					if (listbox->current_value !=scroll->current_value) 
						listbox->control_change_value(scroll->current_value); 
//					flag =2; 
//				} 
				return TRUE; //maybe FALSE 
			} 
		default:return group_class::msg_handler (message); 
	} 
}