//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
//---------------------------------------------------------------------------
#include "UpdateListBoxUnit.h"
#include "GlobalUnit.h"
#pragma package(smart_init)

//---------------------------------------------------------------------------

__fastcall UpdateListBoxUnit::TListBox::TListBox(System::Classes::TComponent* AOwner)
 : TSkinListBox(AOwner)
{
	m_imgBackground = new TBitmap();
	m_imgBackground->LoadFromResourceName(int(HInstance),"CustomPanelBackground");
	m_pFntText = new TFont();
	m_pFntText->Name = "黑体";
	m_pFntText->Size = 9;

}
//---------------------------------------------------------------------------

__fastcall UpdateListBoxUnit::TListBox::~TListBox()
{
	if( m_imgBackground ){
		delete m_imgBackground;
	}

	if( m_pFntText ){
		delete m_pFntText;
	}
}
//---------------------------------------------------------------------------

void __fastcall UpdateListBoxUnit::TListBox::WMPaint(Winapi::Messages::TWMPaint &Message)
{
	DefaultHandler( &Message );

	if( Items->Count==0 ){
		TRect rectClient(0,0,ClientWidth,ClientHeight);

		//绘制底图
		rectClient.left++;
		rectClient.right--;
		rectClient.top++;
		rectClient.bottom--;
		Canvas->StretchDraw( rectClient, m_imgBackground );
	}
}

//---------------------------------------------------------------------------
void __fastcall UpdateListBoxUnit::TListBox::DrawItem(int Index, const System::Types::TRect &Rect, Winapi::Windows::TOwnerDrawState State)
{
	TRect rcDraw, rcOrig = Rect;
	if( rcOrig.Width()<Width ){ //显示滚动条
		rcOrig.right = Width-19; //减去滚动条宽度
	}
	rcDraw = rcOrig;

	Canvas->StretchDraw( rcDraw, m_imgBackground );
	Canvas->Brush->Style = bsClear;

	if( State.Contains(odSelected) ){
		Canvas->Font->Color = clBlack;
		if(State.Contains(odFocused))
			DrawFocusRect(Canvas->Handle, &Rect);
	}

	Canvas->TextOut( Rect.Left+8, Rect.Top+1, Items->Strings[Index]);

	if( Index==Items->Count-1 && Rect.bottom<Height ){ //绘制空白部分
		TRect rcBlank( rcOrig.left, Rect.bottom , Rect.right, Height );
		Canvas->StretchDraw( rcBlank, m_imgBackground );
	}
	
}