#include "l_bitmap.h"
L_LTDIS_API L_INT L_ShowMagGlass(hWnd, bShowMagGlass)
L_HWND hWnd; |
handle to a window |
L_BOOL bShowMagGlass; |
flag that indicates whether to show or hide the Magnifying Glass |
Shows or hides the magnifying glass on the screen.
Parameter | Description | |
hWnd | Handle of the window to which the magnifying glass is attached. | |
bShowMagGlass | Flag that indicates whether to show or hide the magnifying glass. Possible values are: | |
Value | Meaning | |
TRUE | Show the magnifying glass. | |
FALSE | Hide the magnifying glass. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
The function is used to control the display of the magnifying glass on the screen. Since the user is responsible for displaying the magnifying glass and moving it on the screen in a manual update, this function is used in conjunction with L_SetMagGlassPos function.
This function can be called with bShowMagGlass set to TRUE when the left mouse button is pressed to show the magnifying glass. It can be called with bShowMagGlass set to FALSE when the left mouse button is released to hide the magnifying glass.
Note: |
This function can be used only if the MAGGLASS_MANUAL_UPDATE flag was set when calling L_StartMagGlass function. |
Required DLLs and Libraries
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
This example starts the Magnifying Glass in the Manual Update mode, then calls the necessary functions such like L_SetMagGlassPos and L_ShowMagGlass to handle the painting of the Magnifying Glass.
static L_BOOL bLeftButton = FALSE;
static HCURSOR hMagGlassCursor = NULL;
#define IDC_MAGGLASS_CURSOR 1234
L_INT StartMagnifyingGlassExample(L_HWND hWnd,
pBITMAPHANDLE pBitmap,
pBITMAPHANDLE pUpdateBitmap,
RECT* prcView,
HINSTANCE hInst)
{
L_INT nRet;
L_TCHAR szMsg[256]= TEXT("");
MAGGLASSOPTIONS MagGlassOpt;
// Starting the Magnifying Glass
memset(&MagGlassOpt, 0, sizeof(MAGGLASSOPTIONS));
MagGlassOpt.uStructSize = sizeof(MAGGLASSOPTIONS);
MagGlassOpt.nWidth = 100;
MagGlassOpt.nHeight = 100;
MagGlassOpt.nZoom = 400;
MagGlassOpt.clrPen = RGB(255,0,0);
MagGlassOpt.hMagCursor = NULL;
MagGlassOpt.clrBack = RGB(128,128,128);
MagGlassOpt.bEllipse = FALSE;
MagGlassOpt.nBorderSize = 1;
MagGlassOpt.b3D = TRUE;
MagGlassOpt.uPaintFlags = 0;
MagGlassOpt.pMask = NULL;
MagGlassOpt.uMaskCount = 0;
MagGlassOpt.nCrosshair = CROSSHAIR_FINE;
MagGlassOpt.bIgnoreRgn = TRUE;
MagGlassOpt.bCenter = TRUE;
MagGlassOpt.uMagGlassFlags = MAGGLASS_MANUAL_UPDATE;
nRet = L_StartMagGlass (hWnd, pBitmap, prcView, &MagGlassOpt, NULL, NULL);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Starting the Magnifying Glass, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
return nRet;
}
// Updating the Magnifying Glass bitmap with another bitmap that has the
// same width and height.
nRet = L_UpdateMagGlassBitmap(hWnd, pUpdateBitmap, TRUE);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Trying to update the Magnifying Glass bitmap, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
return nRet;
}
L_UpdateMagGlassPaintFlags(hWnd, DISPLAYMODE_SCALETOGRAY); //enable ScaleToGray for MagGlass
hMagGlassCursor = LoadCursor(hInst, MAKEINTRESOURCE(IDC_MAGGLASS_CURSOR));
return SUCCESS;
}
L_BOOL Child_OnSetCursor(L_HWND hWnd, L_HWND hWndCursor, L_UINT codeHitTest, L_UINT msg)
{
if (codeHitTest != HTCLIENT)
return (FORWARD_WM_SETCURSOR(hWnd, hWndCursor, codeHitTest, msg, DefMDIChildProc));
if (L_WindowHasMagGlass(hWnd) && !bLeftButton)
SetCursor(hMagGlassCursor);
return TRUE;
}
L_VOID Child_OnLButtonDown(L_HWND hWnd,
L_BOOL fDoubleClick,
L_INT x,
L_INT y,
L_UINT keyFlags)
{
UNREFERENCED_PARAMETER(fDoubleClick);
UNREFERENCED_PARAMETER(x);
UNREFERENCED_PARAMETER(y);
UNREFERENCED_PARAMETER(keyFlags);
L_INT nRet;
L_TCHAR szMsg[256]=TEXT("");
if (!L_WindowHasMagGlass(hWnd))
return;
SetCapture(hWnd);
ShowCursor(FALSE);
nRet = L_SetMagGlassPos (hWnd, x, y);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Displaying Magnifying Glass, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
return;
}
nRet = L_ShowMagGlass(hWnd, TRUE);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Displaying Magnifying Glass, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
return;
}
bLeftButton = TRUE;
}
L_VOID Child_OnMouseMove(L_HWND hWnd,
L_INT x,
L_INT y,
L_UINT keyFlags)
{
UNREFERENCED_PARAMETER(x);
UNREFERENCED_PARAMETER(y);
UNREFERENCED_PARAMETER(keyFlags);
L_INT nRet;
L_TCHAR szMsg[256]=TEXT("");
if (!L_WindowHasMagGlass(hWnd) || !bLeftButton)
return;
nRet = L_SetMagGlassPos (hWnd, x, y);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Moving Magnifying Glass, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
}
}
L_VOID Child_OnLButtonUp(L_HWND hWnd,
L_INT x,
L_INT y,
L_UINT keyFlags)
{
UNREFERENCED_PARAMETER(x);
UNREFERENCED_PARAMETER(y);
UNREFERENCED_PARAMETER(keyFlags);
L_INT nRet;
L_TCHAR szMsg[256]=TEXT("");
if (!L_WindowHasMagGlass(hWnd) || !bLeftButton)
return;
ReleaseCapture();
nRet = L_ShowMagGlass(hWnd, FALSE);
if (nRet != SUCCESS)
{
wsprintf(szMsg, TEXT("Error Hiding Magnifying Glass, Error: %d"), nRet);
MessageBox(hWnd, szMsg, TEXT("Error"), MB_ICONEXCLAMATION | MB_OK);
}
ShowCursor(TRUE);
bLeftButton = FALSE;
}
Raster .NET | C API | C++ Class Library | JavaScript HTML5
Document .NET | C API | C++ Class Library | JavaScript HTML5
Medical .NET | C API | C++ Class Library | JavaScript HTML5
Medical Web Viewer .NET