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hammer/autoselcombo.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Implements a combo box that autoselects items from the list as the
+//			user types in the edit control. It has the additional feature of
+//			being able to easily set the text color.
+//
+//=============================================================================//
+
+#include "stdafx.h"
+#include "AutoSelCombo.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+BEGIN_MESSAGE_MAP(CAutoSelComboBox, CComboBox)
+	//{{AFX_MSG_MAP(CAutoSelComboBox)
+	ON_WM_CTLCOLOR()
+	ON_CONTROL_REFLECT_EX(CBN_EDITUPDATE, OnEditUpdate)
+	//}}AFX_MSG_MAP
+END_MESSAGE_MAP()
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Constructor.
+//-----------------------------------------------------------------------------
+CAutoSelComboBox::CAutoSelComboBox(void)
+{
+	m_szLastText[0] = '\0';
+	m_dwTextColor = RGB(0, 0, 0);
+	m_bNotifyParent = true;
+	m_nLastSel = -1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Attaches this object to the given dialog item.
+//-----------------------------------------------------------------------------
+void CAutoSelComboBox::SubclassDlgItem(UINT nID, CWnd *pParent)
+{
+	//
+	// Disable parent notifications for CControlBar-derived classes. This is
+	// necessary because these classes result in multiple message reflections
+	// unless we return TRUE from our message handler.
+	//
+	if (pParent->IsKindOf(RUNTIME_CLASS(CControlBar)))
+	{
+		m_bNotifyParent = false;
+	}
+	else
+	{
+		m_bNotifyParent = true;
+	}
+
+	BaseClass::SubclassDlgItem(nID, pParent);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Automatically selects the first matching combo box item when the
+//			edit control's text changes.
+//-----------------------------------------------------------------------------
+void CAutoSelComboBox::OnUpdateText(void)
+{
+	int nCurSel = GetCurSel();
+	int nNewSel = nCurSel;
+
+	DWORD dwEditSel = GetEditSel();
+	int nEditStart = LOWORD(dwEditSel);
+	int nEditEnd = HIWORD(dwEditSel);
+
+	char szTypedText[MAX_PATH];
+	GetWindowText(szTypedText, sizeof(szTypedText));
+
+	//
+	// Select the first match in the list if what they typed is different from
+	// the current selection. This won't do anything if they are deleting characters
+	// from the end of the text.
+	//
+	int nTypedLen = strlen(szTypedText);
+	int nLastLen = strlen(m_szLastText);
+
+	bool bSearched = false;
+	int nIndex = CB_ERR;
+	if (strnicmp(szTypedText, m_szLastText, nTypedLen))
+	{
+		nIndex = FindString(-1, szTypedText);
+		bSearched = true;
+	}
+	else if (nTypedLen < nLastLen)
+	{
+		// They deleted characters, try to match the shorter string exactly.
+		nIndex = FindStringExact(-1, szTypedText);
+		bSearched = true;
+	}
+
+	if (bSearched)
+	{
+		if (nCurSel != nIndex)
+		{
+			SetCurSel(nIndex);
+			nNewSel = nIndex;
+		}
+
+		if (nIndex != CB_ERR)
+		{
+			// Found a match.
+			if ((nEditEnd == -1) || (nEditEnd == (int)strlen(szTypedText)))
+			{
+				SetEditSel(strlen(szTypedText), -1);
+			}
+			else
+			{
+				SetEditSel(nEditStart, nEditEnd);
+			}
+		}
+		else
+		{
+			// No match found.
+			SetWindowText(szTypedText);
+			SetEditSel(nEditStart, nEditEnd);
+		}
+	}
+
+	strcpy(m_szLastText, szTypedText);
+
+	if (nNewSel != m_nLastSel)
+	{
+		GetParent()->SendMessage(WM_COMMAND, MAKEWPARAM(GetDlgCtrlID(), CBN_SELCHANGE), (LPARAM)m_hWnd);
+		m_nLastSel = nNewSel;
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+BOOL CAutoSelComboBox::OnEditUpdate(void)
+{
+	OnUpdateText();
+
+	//
+	// Despite MSDN's lies, returning FALSE here allows the parent
+	// window to hook the notification message as well, not TRUE.
+	//
+	return m_bNotifyParent ? FALSE : TRUE;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Resets the 'last typed text' buffer every time we gain/lose focus.
+//-----------------------------------------------------------------------------
+void CAutoSelComboBox::OnSetFocus(CWnd *pOldWnd)
+{
+	m_szLastText[0] = '\0';
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : dwColor - 
+//-----------------------------------------------------------------------------
+void CAutoSelComboBox::SetTextColor(COLORREF dwColor)
+{
+	m_dwTextColor = dwColor;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Called before painting to override default colors.
+// Input  : pDC - DEvice context being painted into.
+//			pWnd - Control asking for color.
+//			nCtlColor - Type of control asking for color.
+// Output : Returns the handle of a brush to use as the background color.
+//-----------------------------------------------------------------------------
+HBRUSH CAutoSelComboBox::OnCtlColor(CDC *pDC, CWnd *pWnd, UINT nCtlColor)
+{
+	HBRUSH hBrush = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);
+
+	if (nCtlColor == CTLCOLOR_EDIT)
+	{
+		pDC->SetTextColor(m_dwTextColor);
+	}
+
+	return(hBrush);
+}
+
+