#include "stdafx.h"
#include "UIHorizontalLayout.h"

namespace DuiLib
{
	CHorizontalLayoutUI::CHorizontalLayoutUI()
		: m_iSepWidth(0), 
		m_uButtonState(0), 
		m_bImmMode(false)
	{
		__super::m_dwFillMode = GRADIENT_FILL_MODE::HOZ;

		ptLastMouse.x = ptLastMouse.y = 0;
		::ZeroMemory(&m_rcNewPos, sizeof(m_rcNewPos));
	}

	LPCTSTR CHorizontalLayoutUI::GetClass() const
	{
		return _T("HorizontalLayoutUI");
	}

	LPVOID CHorizontalLayoutUI::GetInterface(LPCTSTR pstrName)
	{
		if( _tcscmp(pstrName, DUI_CTR_HORIZONTALLAYOUT) == 0 ) return static_cast<CHorizontalLayoutUI*>(this);
		return CContainerUI::GetInterface(pstrName);
	}

	UINT CHorizontalLayoutUI::GetControlFlags() const
	{
		if( IsEnabled() && m_iSepWidth != 0 ) return UIFLAG_SETCURSOR;
		else return 0;
	}

	void CHorizontalLayoutUI::SetPos(RECT rc, bool bNeedInvalidate)
	{
		CControlUI::SetPos(rc, bNeedInvalidate);
		rc = m_rcItem;

		// Adjust for inset
		rc.left += m_rcInset.left;
		rc.top += m_rcInset.top;
		rc.right -= m_rcInset.right;
		rc.bottom -= m_rcInset.bottom;

		if( m_items.GetSize() == 0) {
			ProcessScrollBar(rc, 0, 0);
			return;
		}

		if( m_pVerticalScrollBar && m_pVerticalScrollBar->IsVisible() ) rc.right -= m_pVerticalScrollBar->GetFixedWidth();
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) rc.bottom -= m_pHorizontalScrollBar->GetFixedHeight();

		// Determine the width of elements that are sizeable
		SIZE szAvailable = { rc.right - rc.left, rc.bottom - rc.top };
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) 
			szAvailable.cx += m_pHorizontalScrollBar->GetScrollRange();

		int nAdjustables = 0;
		int cxFixed = 0;
		int nEstimateNum = 0;
		for( int it1 = 0; it1 < m_items.GetSize(); it1++ ) {
			CControlUI* pControl = static_cast<CControlUI*>(m_items[it1]);
			if( !pControl->IsVisible() ) continue;
			if( pControl->IsFloat() ) continue;
			SIZE sz = pControl->EstimateSize(szAvailable);
			if( sz.cx == 0 ) {
				nAdjustables++;
			}
			else {
				if( sz.cx < pControl->GetMinWidth() ) sz.cx = pControl->GetMinWidth();
				if( sz.cx > pControl->GetMaxWidth() ) sz.cx = pControl->GetMaxWidth();
			}
			cxFixed += sz.cx +  pControl->GetPadding().left + pControl->GetPadding().right;
			nEstimateNum++;
		}
		cxFixed += (nEstimateNum - 1) * m_iChildPadding;

		int cxExpand = 0;
        int cxNeeded = 0;
		if( nAdjustables > 0 ) cxExpand = MAX(0, (szAvailable.cx - cxFixed) / nAdjustables);
		// Position the elements
		SIZE szRemaining = szAvailable;
		int iPosX = rc.left;
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) {
			iPosX -= m_pHorizontalScrollBar->GetScrollPos();
		}
		int iAdjustable = 0;
		int cxFixedRemaining = cxFixed;
		for( int it2 = 0; it2 < m_items.GetSize(); it2++ ) {
			CControlUI* pControl = static_cast<CControlUI*>(m_items[it2]);
			if( !pControl->IsVisible() ) continue;
			if( pControl->IsFloat() ) {
				SetFloatPos(it2);
				continue;
			}
			RECT rcPadding = pControl->GetPadding();
			szRemaining.cx -= rcPadding.left;
			SIZE sz = pControl->EstimateSize(szRemaining);
			if( sz.cx == 0 ) {
				iAdjustable++;
				sz.cx = cxExpand;
				// Distribute remaining to last element (usually round-off left-overs)
				if( iAdjustable == nAdjustables ) {
					sz.cx = MAX(0, szRemaining.cx - rcPadding.right - cxFixedRemaining);
				}
				if( sz.cx < pControl->GetMinWidth() ) sz.cx = pControl->GetMinWidth();
				if( sz.cx > pControl->GetMaxWidth() ) sz.cx = pControl->GetMaxWidth();
			}
			else {
				if( sz.cx < pControl->GetMinWidth() ) sz.cx = pControl->GetMinWidth();
				if( sz.cx > pControl->GetMaxWidth() ) sz.cx = pControl->GetMaxWidth();

				cxFixedRemaining -= sz.cx + rcPadding.left + rcPadding.right ;  
			}
			cxFixedRemaining -= m_iChildPadding;  

			sz.cy = pControl->GetFixedHeight();
			if( sz.cy == 0 ) sz.cy = rc.bottom - rc.top - rcPadding.top - rcPadding.bottom;
			if( sz.cy < 0 ) sz.cy = 0;
			if( sz.cy < pControl->GetMinHeight() ) sz.cy = pControl->GetMinHeight();
			if( sz.cy > pControl->GetMaxHeight() ) sz.cy = pControl->GetMaxHeight();

			RECT rcCtrl = { iPosX + rcPadding.left, rc.top + rcPadding.top, iPosX + sz.cx + rcPadding.left , rc.top + rcPadding.top + sz.cy}; 
			pControl->SetPos(rcCtrl, false);
			iPosX += sz.cx + m_iChildPadding + rcPadding.left + rcPadding.right;
            cxNeeded += sz.cx + rcPadding.left + rcPadding.right;
			szRemaining.cx -= sz.cx + m_iChildPadding + rcPadding.right;
		}
        cxNeeded += (nEstimateNum - 1) * m_iChildPadding;

		// Process the scrollbar
		ProcessScrollBar(rc, cxNeeded, 0);
	}

	void CHorizontalLayoutUI::DoPostPaint(HDC hDC, const RECT& rcPaint)
	{
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && !m_bImmMode ) {
			RECT rcSeparator = GetThumbRect(true);
			CRenderEngine::DrawColor(hDC, rcSeparator, 0xAA000000);
		}
	}

	void CHorizontalLayoutUI::SetSepWidth(int iWidth)
	{
		m_iSepWidth = iWidth;
	}

	int CHorizontalLayoutUI::GetSepWidth() const
	{
		return m_iSepWidth;
	}

	void CHorizontalLayoutUI::SetSepImmMode(bool bImmediately)
	{
		if( m_bImmMode == bImmediately ) return;
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && !m_bImmMode && m_pManager != NULL ) {
			m_pManager->RemovePostPaint(this);
		}

		m_bImmMode = bImmediately;
	}

	bool CHorizontalLayoutUI::IsSepImmMode() const
	{
		return m_bImmMode;
	}

	void CHorizontalLayoutUI::SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue)
	{
		if( _tcscmp(pstrName, _T("sepwidth")) == 0 ) SetSepWidth(_ttoi(pstrValue));
		else if( _tcscmp(pstrName, _T("sepimm")) == 0 ) SetSepImmMode(_tcscmp(pstrValue, _T("true")) == 0);
		else CContainerUI::SetAttribute(pstrName, pstrValue);
	}

	void CHorizontalLayoutUI::DoEvent(TEventUI& event)
	{
		if( m_iSepWidth != 0 ) {
			if( event.Type == UIEVENT_BUTTONDOWN && IsEnabled() )
			{
				RECT rcSeparator = GetThumbRect(false);
				if( ::PtInRect(&rcSeparator, event.ptMouse) ) {
					m_uButtonState |= UISTATE_CAPTURED;
					ptLastMouse = event.ptMouse;
					m_rcNewPos = m_rcItem;
					if( !m_bImmMode && m_pManager ) m_pManager->AddPostPaint(this);
					return;
				}
			}
			if( event.Type == UIEVENT_BUTTONUP )
			{
				if( (m_uButtonState & UISTATE_CAPTURED) != 0 ) {
					m_uButtonState &= ~UISTATE_CAPTURED;
					m_rcItem = m_rcNewPos;
					if( !m_bImmMode && m_pManager ) m_pManager->RemovePostPaint(this);
					NeedParentUpdate();
					return;
				}
			}
			if( event.Type == UIEVENT_MOUSEMOVE )
			{
				if( (m_uButtonState & UISTATE_CAPTURED) != 0 ) {
					LONG cx = event.ptMouse.x - ptLastMouse.x;
					ptLastMouse = event.ptMouse;
					RECT rc = m_rcNewPos;
					if( m_iSepWidth >= 0 ) {
						if( cx > 0 && event.ptMouse.x < m_rcNewPos.right - m_iSepWidth ) return;
						if( cx < 0 && event.ptMouse.x > m_rcNewPos.right ) return;
						rc.right += cx;
						if( rc.right - rc.left <= GetMinWidth() ) {
							if( m_rcNewPos.right - m_rcNewPos.left <= GetMinWidth() ) return;
							rc.right = rc.left + GetMinWidth();
						}
						if( rc.right - rc.left >= GetMaxWidth() ) {
							if( m_rcNewPos.right - m_rcNewPos.left >= GetMaxWidth() ) return;
							rc.right = rc.left + GetMaxWidth();
						}
					}
					else {
						if( cx > 0 && event.ptMouse.x < m_rcNewPos.left ) return;
						if( cx < 0 && event.ptMouse.x > m_rcNewPos.left - m_iSepWidth ) return;
						rc.left += cx;
						if( rc.right - rc.left <= GetMinWidth() ) {
							if( m_rcNewPos.right - m_rcNewPos.left <= GetMinWidth() ) return;
							rc.left = rc.right - GetMinWidth();
						}
						if( rc.right - rc.left >= GetMaxWidth() ) {
							if( m_rcNewPos.right - m_rcNewPos.left >= GetMaxWidth() ) return;
							rc.left = rc.right - GetMaxWidth();
						}
					}

					CDuiRect rcInvalidate = GetThumbRect(true);
					m_rcNewPos = rc;
					m_cxyFixed.cx = m_rcNewPos.right - m_rcNewPos.left;

					if( m_bImmMode ) {
						m_rcItem = m_rcNewPos;
						NeedParentUpdate();
					}
					else {
						rcInvalidate.Join(GetThumbRect(true));
						rcInvalidate.Join(GetThumbRect(false));
						if( m_pManager ) m_pManager->Invalidate(rcInvalidate);
					}
					return;
				}
			}
			if( event.Type == UIEVENT_SETCURSOR )
			{
				RECT rcSeparator = GetThumbRect(false);
				if( IsEnabled() && ::PtInRect(&rcSeparator, event.ptMouse) ) {
					::SetCursor(::LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZEWE)));
					return;
				}
			}
		}
		CContainerUI::DoEvent(event);
	}

	RECT CHorizontalLayoutUI::GetThumbRect(bool bUseNew) const
	{
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && bUseNew) {
			if( m_iSepWidth >= 0 ) return CDuiRect(m_rcNewPos.right - m_iSepWidth, m_rcNewPos.top, m_rcNewPos.right, m_rcNewPos.bottom);
			else return CDuiRect(m_rcNewPos.left, m_rcNewPos.top, m_rcNewPos.left - m_iSepWidth, m_rcNewPos.bottom);
		}
		else {
			if( m_iSepWidth >= 0 ) return CDuiRect(m_rcItem.right - m_iSepWidth, m_rcItem.top, m_rcItem.right, m_rcItem.bottom);
			else return CDuiRect(m_rcItem.left, m_rcItem.top, m_rcItem.left - m_iSepWidth, m_rcItem.bottom);
		}
	}
}
