listbox.c

MinGUI 可视化程序代码

int ListBox_InsertItem(HWND hWnd,int index,char *strItem)
{ TListBoxItem *node;
  TListBox *m=(TListBox *)WndClsBuf(hWnd);
  int i;
  node=(TListBoxItem *)GetMem(sizeof(TListBoxItem));
  if(strItem)
  { node->caption=(char *)GetMem(strlen(strItem)+1);
    strcpy(node->caption,strItem);
  }else node->caption=NULL;

  if(m->TotalItemCount==0)
  { m->Head=m->PageFirst=node->next=node->prev=node;
    node->index=0;
	ListBox_SelectedAssign(hWnd,node);
	index=0;
  }
  else
  { TListBoxItem *insertpos=m->Head;
    
    if(index>=0 && index<m->TotalItemCount)
	{ if(index==0) m->Head=node;
	  else for(i=0;i<index;i++) insertpos=insertpos->next;
	  if(insertpos==m->PageFirst) m->PageFirst=node;
	}else index=m->TotalItemCount; /*return value*/

	node->next=insertpos;
    node->prev=insertpos->prev;
    node->next->prev=node;
    node->prev->next=node;
	node->index=index;
  }
  m->TotalItemCount++;
  for(i=index;i<m->TotalItemCount;i++)
  {  node->index=i;
	 node=node->next;
  }

  Invalidate(hWnd);
  
  if(WndGetAttr(hWnd,WS_VSCROLL|WS_BORDER)==(WS_VSCROLL|WS_BORDER))
  { ScrollBar_Synchronize2(hWnd,m->PageFirst->index,m->TotalItemCount);
  }

 
  return index;
}

//---------------------------------------------------------------------------
void ListBox_ChangeItem(HWND hWnd,int index,char *strItem)
{  TListBoxItem *node=GetItemNodeByIndex(hWnd,index);
   if(node)
   { if(strcmp(node->caption,strItem)!=0)
     { TListBox *m=(TListBox *)WndClsBuf(hWnd);
	   if(node->caption) FreeMem(node->caption);
       if(strItem)
	   { node->caption=(char *)GetMem(strlen(strItem)+1);
         strcpy(node->caption,strItem);
	   }else node->caption=NULL;

	   if(m->MarqueeItem==node)
       { int textwidth=strlen(node->caption)*SYS_FONT_WIDTH;
         int clipwidth=crWidth(hWnd)-m->LeftMargin;
	     if(textwidth<=clipwidth) 
		 { m->MarqueeItem=NULL;
		   if(m->NewMarquee==node)
		   { m->NewMarquee=NULL;
		     EnableTimer(m->MarqueeTimer,false);
		   }
		 }
	   }

	   RepaintSubItem(hWnd,index);
	 }
   }
}
//---------------------------------------------------------------------------
int ListBox_AddItem(HWND hWnd,char *strItem)
{ return ListBox_InsertItem(hWnd,-1,strItem);
}
//---------------------------------------------------------------------------
bool ListBox_DeleteItem(HWND hWnd,int index)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  if(index>=0 && index<m->TotalItemCount)
  {	TListBoxItem *node,*nextnode;
	int i;
	for(i=0,node=m->Head;i<index;i++)
    {  node=node->next;
	}
	
	if(m->TotalItemCount>1)
	{ if(node==m->Selected)
	  {	if(node->next!=m->Head) ListBox_SelectedAssign(hWnd,node->next);
		else ListBox_SelectedAssign(hWnd,node->prev); 
	  }

      if(node==m->Head)m->Head=node->next;
      if(node==m->PageFirst)m->PageFirst=node->next;
	  
	  node->prev->next=node->next;
	  node->next->prev=node->prev;

	  if(m->PageFirst->index+m->CountPerPage>=m->TotalItemCount && m->PageFirst!=m->Head)
	  { m->PageFirst=m->PageFirst->prev; /*a line scoll up*/
	  }
	  
	}
	else
	{ m->Head=m->PageFirst=NULL;
	  ListBox_SelectedAssign(hWnd,NULL);
	}

	if(node==m->NewMarquee)
	{ m->NewMarquee=NULL;
	}
	if(node==m->MarqueeItem)
	{ m->MarqueeItem=NULL;
	}
    
	nextnode=node->next;
	FreeMem(node->caption);
    FreeMem(node);
	m->TotalItemCount--;
	for(i=index;i<m->TotalItemCount;i++)
	{  nextnode->index=i;
	   nextnode=nextnode->next;
	} 
     
    Invalidate(hWnd);

    if(WndGetAttr(hWnd,WS_VSCROLL|WS_BORDER)==(WS_VSCROLL|WS_BORDER))
	{ ScrollBar_Synchronize2(hWnd,(m->PageFirst)?m->PageFirst->index:0,m->TotalItemCount);
	}
    return true;
  }else return false;
}
//---------------------------------------------------------------------------
int  ListBox_SetSelectedIndex(HWND hWnd,int index)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  int oldsel=(m->Selected)?m->Selected->index:-1;
  if(m->PageFirst)
  { if(index<0 || index>=m->TotalItemCount)index=-1;
    if(index==oldsel) return oldsel;
    if(index==-1)
	{ ListBoxChangeSubFocus(hWnd,-1);
	}
	else if(index<m->PageFirst->index)
	{ TListBoxItem *node=m->PageFirst;
	  int offset=node->index - index;
	  while(offset>0)
	  { offset--;
	    node=node->prev;
	  }
	  ListBoxPageScroll(hWnd,node->index,node->index-m->PageFirst->index);
      ListBox_SelectedAssign(hWnd,node);
	}
	else
	{ int page_bottom=m->PageFirst->index+m->CountPerPage-1;
	  if(page_bottom>=m->TotalItemCount)page_bottom=m->TotalItemCount-1;
      if(index<=page_bottom)
	  { ListBoxChangeSubFocus(hWnd,index);
	  }
	  else
	  {  TListBoxItem *node=m->PageFirst;
		 int offset=index - node->index;
		 while(offset>0)
		 { offset--;
	       node=node->next;
		 }
         if(node->index+m->CountPerPage<=m->TotalItemCount)
		 {  ListBoxPageScroll(hWnd,node->index,node->index-m->PageFirst->index);
		 }
		 else
		 { int newtop=m->TotalItemCount-m->CountPerPage;
		   ListBoxPageScroll(hWnd,newtop,newtop-m->PageFirst->index);
		 }
		 ListBox_SelectedAssign(hWnd,node);
	  }
	}
  }
  return oldsel;
}
//---------------------------------------------------------------------------
int ListBox_GetSelectedIndex(HWND hWnd)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  return (m->Selected)?m->Selected->index:-1;
}
//---------------------------------------------------------------------------
int ListBox_GetItemIndex(HWND hWnd,TListBoxItem *item)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  if(item)
  {  return item->index;
  }
  return -1;
}
//---------------------------------------------------------------------------
char *ListBox_GetSelectedItem(HWND hWnd)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  if(m->Selected) return m->Selected->caption;
  else return NULL;
}
//---------------------------------------------------------------------------
TListBoxItem  *GetItemNodeByIndex(HWND hWnd,int index)
{ if(index>=0)
  { TListBox *m=(TListBox *)WndClsBuf(hWnd);
    TListBoxItem *node;   
    int i;
    for(i=0,node=m->Head;i<m->TotalItemCount;i++,node=node->next)
	{ if(i==index) return node;
	}
  }
  return NULL;
}
//---------------------------------------------------------------------------
char *ListBox_GetItemByIndex(HWND hWnd,int index)
{ TListBoxItem *node=GetItemNodeByIndex(hWnd,index);   
  return (node)?node->caption:NULL;
}
//---------------------------------------------------------------------------
void ListBox_SetMargin(HWND hWnd,int leftMargin,int lineMargin)
{ TListBox *m=(TListBox *)WndClsBuf(hWnd);
  
  if(m->LeftMargin!=leftMargin || m->LineMargin!=lineMargin)
  { 
	if(m->LeftMargin!=leftMargin)
	{ m->LeftMargin=leftMargin;
	}
    if(m->LineMargin!=lineMargin)
	{ m->LineMargin=lineMargin;
	  m->ItemHeight=SYS_FONT_HEIGHT+lineMargin;
	  m->CountPerPage=(crHeight(hWnd)+SYS_FONT_HEIGHT)/m->ItemHeight;
	}
    Invalidate(hWnd);
  }
}
//---------------------------------------------------------------------------
HRESULT CALLBACK DefListBoxProc(HWND hWnd,UINT Message,WPARAM WParam,LPARAM LParam)
{
  switch(Message)
  { case WM_KEYDOWN:
		 if(WParam==VK_UP || WParam==VK_DOWN) 
         { ListBox_DirectSubFocus(hWnd,(BOOL)(WParam==VK_UP));
		   return 0;
		 }
        break;

    case WM_KEYUP:
		 if(WParam==VK_RETURN)
         { TListBox *lstbox=(TListBox *)WndClsBuf(hWnd);
		   if(lstbox->Selected && lstbox->fuc)
		   { lstbox->fuc(hWnd,lstbox->Selected->index);
             return 0; 
           }
		 }
         break;

    case WM_LBUTTONDOWN:
		 { int xPos=LOWORD(LParam);
           int yPos=HIWORD(LParam);
           if(PointInRect(xPos,yPos,&WNDPTR(hWnd)->ClientRect))  
           { ListBoxDealPenEvent(hWnd,Message,yPos); 
		   }
		   break;
		 }

	case WM_VSCROLL:
           ListBoxPageScroll(hWnd,WParam,LParam);
		 return 0;
    
    case WM_LBUTTONUP:
	case WM_MOUSEMOVE:
		 { TListBox *m=(TListBox *)WndClsBuf(hWnd);
		   int xPos=LOWORD(LParam);
           int yPos=HIWORD(LParam);
		   if(PointInRect(xPos,yPos,&WNDPTR(hWnd)->ClientRect))  
		   { ListBoxDealPenEvent(hWnd,Message,yPos);
		     return 0;
		   }
		 }
		 break;

    case WM_KILLFOCUS:
		   RepaintSubItem(hWnd,ListBox_GetSelectedIndex(hWnd));
 		   if(((TListBox *)WndClsBuf(hWnd))->NewMarquee)
    	     EnableTimer(((TListBox *)WndClsBuf(hWnd))->MarqueeTimer,false);
		 return 0;

    case WM_SETFOCUS:
		   RepaintSubItem(hWnd,ListBox_GetSelectedIndex(hWnd));
		   if(((TListBox *)WndClsBuf(hWnd))->NewMarquee)
		     EnableTimer(((TListBox *)WndClsBuf(hWnd))->MarqueeTimer,true);
		 return 0;

	case WM_PAINT:
           ListBoxRepaint(hWnd);
		 return 0;
 
	case WM_CREATE:
            ListBoxCreate(hWnd);
         return 0;

    case WM_DESTROY:
            ListBoxDestroy(hWnd);
	     return 0;
  }
  return DefWindowProc(hWnd,Message,WParam,LParam);
}
//---------------------------------------------------------------------------
void CM_RegisterListBox(void)
{  TWNDCLASS wc;
   memset(&wc,0,sizeof(wc));
   wc.dwStyle=WS_BORDER_LOWERED;
   wc.clForeground=CL_WINDOWTEXT;
   wc.clBackground=CL_WHITE;
   wc.cbWndExtra=sizeof(TListBox);
   wc.lpfnWndProc=DefListBoxProc;
   wc.lpszClassName="ListBox";
   RegisterClass(&wc);
}
//---------------------------------------------------------------------------
void CM_RegisterMenu(void)
{  TWNDCLASS wc;
   memset(&wc,0,sizeof(wc));
   wc.dwStyle=WS_BORDER_RAISED;
   wc.clForeground=CL_WINDOWTEXT;
   wc.clBackground=CL_BTNFACE;
   wc.cbWndExtra=sizeof(TListBox);
   wc.lpfnWndProc=DefListBoxProc;
   wc.lpszClassName="Menu";
   RegisterClass(&wc);
}
//---------------------------------------------------------------------------