www.pudn.com > OSDemo.rar > BalloonTip.cpp
/*******************************************************************************
File: BalloonTip.cpp
Description: This file contains the module for creating a a balloon tip which can
be shown anywhere on a parent window
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Compiler with version number : Visual C++ 6.0
Copyright (c) 2001, Prateek Kaul
All rights Reserved.
The copyright to the computer program(s) herein is the property of Prateek Kaul
The program(s) may be used and/or copied only with the written permission of
Prateek Kaul or in accordance with the terms and conditions stipulated
in the agreement/contract under which the program(s) have been supplied.
********************************************************************************/
#include "stdafx.h"
#include "BalloonTip.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/*----------------------------------------------------------------------------
Message map
----------------------------------------------------------------------------*/
BEGIN_MESSAGE_MAP(CBalloonTip, CFrameWnd)
//{{AFX_MSG_MAP(CBalloonTip)
ON_WM_TIMER()
ON_WM_LBUTTONDOWN()
ON_WM_RBUTTONDOWN()
ON_WM_CREATE()
ON_WM_PAINT()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/*-----------------------------------------------------------------------------
Function : CBalloonTip::CBalloonTip()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Constructor
Parameters :
1. strMessage -> Message to be shown in the balloon
2. lf -> LOGFONT structure from which the the message font
will be created.
3. bBalloonUp -> Is the balloon up or upside down?
Return Value : none
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
CBalloonTip::CBalloonTip(CString strMessage, LOGFONT lf, BOOL bBalloonUp)
{
m_strMessage = strMessage;
m_bBalloonUp = bBalloonUp;
VERIFY(m_fontBalloonText.CreateFontIndirect(&lf));
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::~CBalloonTip()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Destructor
Parameters : none
Return Value : none
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
CBalloonTip::~CBalloonTip()
{
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::Show()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Creates the CBalloonTip on the heap, forces heap creation
Parameters :
1. pt -> Point of the balloon tip
2. size -> Size of the window(width and height)
3. strMessage -> Message to be shown in the balloon
4. nSecs -> Seconds for which the balloon will be shown
5. lf -> LOGFONT structure from which the the message font
will be created.
6. bBalloonUp -> Is balloon up or upside down?
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
CBalloonTip* CBalloonTip::Show(CPoint pt, CSize size, CString strMessage, LOGFONT lf, UINT nSecs, BOOL bBalloonUp)
{
if( CBalloonTip::nBalloonInstances != 0) // No window creation if already one instance of the class
{
return NULL;
}
CBalloonTip* pBalloonTip = new CBalloonTip(strMessage, lf, bBalloonUp);
CBalloonTip::nBalloonInstances = 1; // Only one instance of window possible.
UINT nRectLeft;
UINT nRectRight;
UINT nRectTop;
UINT nRectBottom;
// Rectangle co-ordinates w.r.t balloon tip point
// Balloon tip at CPoint pt shold remain there without change in window size
if (bBalloonUp)
{
nRectLeft = pt.x - (size.cx * 0.65);
nRectRight = pt.x + (size.cx * 0.35);
nRectTop = pt.y - size.cy;
nRectBottom = pt.y;
}
else
{
nRectLeft = pt.x - (size.cx * 0.35);
nRectRight = pt.x + (size.cx * 0.65);
nRectTop = pt.y;
nRectBottom = pt.y + (size.cy);
}
pBalloonTip->Create(CRect(nRectLeft, nRectTop, nRectRight, nRectBottom));
pBalloonTip->MakeVisisble(nSecs);
return pBalloonTip;
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::MakeVisible()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Shows the balloon and sets the timer for it's eventual destruction.
Parameters :
1. nSecs -> Seconds for the balloon to be shown
Return Value : none
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::MakeVisisble(UINT nSecs)
{
ASSERT(nSecs > 0);
SetTimer(ID_TIMER, (nSecs * 1000), NULL);
CRect rect;
GetWindowRect(&rect);
// Caption bar height to offeset when the balloon is shown
int nCaptionBarSize = ::GetSystemMetrics(SM_CYCAPTION);
int nVerticalBorderSize = ::GetSystemMetrics(SM_CYSIZEFRAME);
if(m_bBalloonUp)
{
// Account for the missing title bar and border thickness in the 3rd parameter
// as the balloon shifts up by the height of title bar and window tickness
SetWindowPos(
&wndTopMost,
m_rectWindow.left,
(m_rectWindow.top + nCaptionBarSize + (2 * nVerticalBorderSize)),
m_rectWindow.right,
m_rectWindow.bottom,
SWP_SHOWWINDOW | SWP_NOACTIVATE
);
}
else
{
// Account for the missing title bar and border thickness in the 3rd parameter
// as the balloon shifts up by the height of window tickness.
SetWindowPos(
&wndTopMost,
m_rectWindow.left,
m_rectWindow.top - nVerticalBorderSize,
m_rectWindow.right,
m_rectWindow.bottom,
SWP_SHOWWINDOW | SWP_NOACTIVATE
);
}
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::OnTimer()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Gets called by MFC for an WM_TIMER message
Parameters :
1. nIDEvent -> Timer ID
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::OnTimer(UINT nIDEvent)
{
KillTimer(ID_TIMER);
DestroyWindow();
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::OnLButtonDown()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Gets called by MFC for an WM_LBUTTONDOWN message
Parameters :
See MFC documentation
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::OnLButtonDown(UINT nFlags, CPoint point)
{
KillTimer(ID_TIMER);
DestroyWindow();
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::OnRButtonDown()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Gets called by MFC for an WM_RBUTTONDOWN message
Parameters :
See MFC documentation
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::OnRButtonDown(UINT nFlags, CPoint point)
{
KillTimer(ID_TIMER);
DestroyWindow();
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::OnCreate()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Gets called by MFC for an WM_CREATE message
Parameters :
See MFC documentation
Return Value : int
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
int CBalloonTip::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
{
return -1;
}
// Remove caption and thick frame for proper shading
ModifyStyle(WS_CAPTION | WS_THICKFRAME, 0);
CRect t_Rect;
GetClientRect(&t_Rect); // Get the client rectangle to set the balloon region
if (m_bBalloonUp)
{
// Calculation of Text window, where to write text in the balloon
m_rectText.left = t_Rect.Width() * 0.10;
m_rectText.right = t_Rect.Width() * 0.90;
m_rectText.top = t_Rect.Height() * 0.10;
m_rectText.bottom = t_Rect.Height()* 0.70;
// Create an elliptical region out of the client rectangle
m_rgnRoundRect.CreateRoundRectRgn(
t_Rect.left,
t_Rect.top,
t_Rect.right,
t_Rect.bottom - (t_Rect.Height() * 0.25),
abs(t_Rect.left - t_Rect.right) * 0.18,
t_Rect.Height() * 0.25
);
// Start the process of creating the balloon tip
CPoint ptTri[4];
ptTri[0].x = (t_Rect.left) + (t_Rect.Width() * 0.93);
ptTri[0].y = (t_Rect.bottom) - (t_Rect.Height() * 0.40);
ptTri[1].x = (t_Rect.left) + (t_Rect.Width() * 0.65);
ptTri[1].y = t_Rect.bottom;
ptTri[2].x = (t_Rect.left) + (t_Rect.Width() * 0.70);
ptTri[2].y = (t_Rect.bottom) - (t_Rect.Height() * 0.40);
ptTri[3].x = (t_Rect.left) + (t_Rect.Width() * 0.93);
ptTri[3].y = (t_Rect.bottom) - (t_Rect.Height() * 0.40);
m_rgnTip.CreatePolygonRgn(ptTri, 3, ALTERNATE);
}
else
{
// Calculation of Text window, where to write text in the balloon
m_rectText.left = t_Rect.Width() * 0.10;
m_rectText.right = t_Rect.Width() * 0.90;
m_rectText.top = t_Rect.Height() * 0.30;
m_rectText.bottom = t_Rect.Height() * 0.90;
// Create an elliptical region out of the client rectangle
m_rgnRoundRect.CreateRoundRectRgn(
t_Rect.left,
t_Rect.bottom - (t_Rect.Height() * 0.75),
t_Rect.right,
t_Rect.bottom,
abs(t_Rect.left - t_Rect.right) * 0.18,
t_Rect.Height() * 0.25
);
// Start the process of creating the balloon tip
CPoint ptTri[4];
ptTri[0].x = (t_Rect.left) + (t_Rect.Width() * 0.07);
ptTri[0].y = (t_Rect.Height() * 0.40);
ptTri[1].x = (t_Rect.left) + (t_Rect.Width() * 0.35);
ptTri[1].y = t_Rect.bottom - t_Rect.Height();
ptTri[2].x = (t_Rect.left) + (t_Rect.Width() * 0.30);
ptTri[2].y = t_Rect.Height() * 0.40;
ptTri[3].x = (t_Rect.left) + (t_Rect.Width() * 0.07);
ptTri[3].y = t_Rect.Height() * 0.40;
m_rgnTip.CreatePolygonRgn(ptTri, 3, ALTERNATE);
}
// Create the combined region with ellipse and tip
CRgn rgnComb;
rgnComb.CreateRectRgn(t_Rect.left, t_Rect.top, t_Rect.right, t_Rect.bottom);
int iRetComb = rgnComb.CombineRgn(&m_rgnTip, &m_rgnRoundRect, RGN_OR);
if (iRetComb == ERROR)
{
::AfxMessageBox( "ERROR in Combining Region" );
return -1;
}
SetWindowRgn(rgnComb.operator HRGN(), TRUE);
return 0;
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::OnPaint()
Created: Nov 1, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Gets called by MFC for a WM_PAINT message
Parameters :
See MFC documentation
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::OnPaint()
{
CPaintDC dc(this); // device context for painting
CRect t_Rect;
GetClientRect(&t_Rect);
// Get the total balloon, inclding all cut out regions
CRgn rgnComb;
rgnComb.CreateRectRgn(t_Rect.left, t_Rect.top, t_Rect.right, t_Rect.bottom);
// Create a balloon tip from this total region
int iRetComb = rgnComb.CombineRgn(&m_rgnTip, &m_rgnRoundRect, RGN_OR );
if (iRetComb == ERROR)
{
::AfxMessageBox( "ERROR in Combining Region" );
return;
}
CBrush brOutlineBrush;
brOutlineBrush.CreateSolidBrush(RGB(0, 0, 0)); // blue
CBrush brFillBrush;
brFillBrush.CreateSolidBrush(RGB(249, 254, 188)); // light yellow
dc.FillRgn(&rgnComb, &brFillBrush); // Fill the balloon
dc.FrameRgn(&rgnComb, &brOutlineBrush, 2, 1); // Outline the balloon
int nBkMode = dc.SetBkMode(TRANSPARENT);
COLORREF clrPrevious = dc.SetTextColor(RGB(255, 0, 0));
CFont *pFont = dc.SelectObject(&m_fontBalloonText);
CSize czTextWidth = dc.GetTextExtent(m_strMessage);
if (czTextWidth.cx < m_rectText.Width())
{
dc.DrawText(m_strMessage, m_rectText, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
}
else
{
dc.DrawText(m_strMessage, m_rectText, DT_CENTER | DT_WORDBREAK);
}
// Restore the DC to its oroginal state
dc.SelectObject(pFont);
dc.SetBkColor(nBkMode);
dc.SetTextColor(clrPrevious);
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::PreCreateWindow(CREATESTRUCT& cs)
Created: Dec 07, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Called by MFC when a before WM_CREATE message is received by the
window.
We override this function so that the window so created is not
visible in the Taskbar. We make this window the child of an
invisible parent m_wndInvisibleParent.
Parameters : Look in MFC documentation
Return Value : BOOL
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
BOOL CBalloonTip::PreCreateWindow(CREATESTRUCT& cs)
{
if (!CWnd::PreCreateWindow(cs))
{
return FALSE;
}
// Create invisible parent window
if (!::IsWindow(m_wndInvisibleParent.m_hWnd))
{
// Try creating the invisible parent window
PCSTR pstrOwnerClass = ::AfxRegisterWndClass(0);
BOOL bError = m_wndInvisibleParent.CreateEx(
0,
pstrOwnerClass,
_T(""),
WS_POPUP,
0,
0,
0,
0,
NULL,
0
);
if (bError == FALSE)
{
return FALSE;
}
}
// Set the invisible window as the parent of "this" window
cs.hwndParent = m_wndInvisibleParent.m_hWnd;
return TRUE;
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::Create()
Created: Dec 07, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Called by the static CBalloonTip to create a Windows(R) window
Parameters : rect-> a rectangle in screen co ordinates where the balloon
will be displayed.
Return Value : BOOL
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
BOOL CBalloonTip::Create(CRect rect)
{
m_rectWindow = rect;
PCSTR pstrOwnerClass = ::AfxRegisterWndClass(0);
BOOL bResult = CFrameWnd::Create(pstrOwnerClass, NULL, WS_OVERLAPPED, m_rectWindow);
return bResult;
}
/*-----------------------------------------------------------------------------
Function : CBalloonTip::Hide()
Created: Dec 08, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Provided to destroy a balloon before it self destructs. If it is
already hidden, it will have no effect.
Parameters : CBalloonTip*
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::Hide(CBalloonTip* pBalloonTip)
{
if (CBalloonTip::nBalloonInstances != 0)
{
pBalloonTip->ShowWindow(SW_HIDE);
pBalloonTip->KillTimer(ID_TIMER);
pBalloonTip->DestroyWindow();
}
}
/*-----------------------------------------------------------------------------
int CBalloonTip::nBalloonInstances;
Abstract: Used for preventing more than one instance of the class CBalloonTip
-----------------------------------------------------------------------------*/
int CBalloonTip::nBalloonInstances = 0;
/*-----------------------------------------------------------------------------
Function : CBalloonTip::PostNcDestroy()
Created: Dec 08, 2001
Author: Prateek Kaul
e-mail: kaulpr@yahoo.com
Abstract : Last function the window receives when it is destroyed.
Used for resetting the counter CBalloonTip::nBalloonInstances to 0,
so that a new instance of this class can be created.
Parameters : void
Return Value : void
Exceptions : none
Revisions : none
----------------------------------------------------------------------------*/
void CBalloonTip::PostNcDestroy()
{
CBalloonTip::nBalloonInstances = 0;
CFrameWnd::PostNcDestroy();
}