#include "l_bitmap.h"
L_LTANN_API L_INT L_AnnSelectRect(hObject, pRect)
Selects all objects within the specified rectangle, relative to the window.
Handle to the annotation object.
Pointer to the Windows RECT structure. Coordinates are relative to the associated window's client area.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
Selecting an object sets its selected property to TRUE.
Required DLLs and Libraries
Win32, x64.
This example selects all objects in the top half of the client area, changes the
background color of selected objects, and updates the display.
L_INT AnnSelectRectExample(HWND hWnd,
HANNOBJECT hContainer)/* Container annotation object */
{
L_INT nRet;
RECT rClientArea; /* Client area of the current window */
RECT rSelectionRect; /* Bounding rectangle of selected objects */
HDC hWindowDC; /* Device context of the current window */
RECT rAnnBounds; /* Bounding rectangle when displaying the note */
L_UINT SelectCount; /* Number of objects selected */
L_TCHAR szMessage[80]; /* Message buffer */
/* Get the device context of the current window */
hWindowDC = GetDC (hWnd);
/* Get the client area of the current window */
GetClientRect(hWnd,&rClientArea);
/* Select the objects in the top half of the client area. Notice that
some adjustments are required to ensure that the specified rectangle encloses
all objects in the top half of the client area. */
rSelectionRect.top = rClientArea.top - 1;
rSelectionRect.left = rClientArea.left -1;
rSelectionRect.right = rClientArea.right + 2;
rSelectionRect.bottom = (rClientArea.bottom / 2) + 2;
nRet = L_AnnSelectRect(hContainer, &rSelectionRect);
if(nRet != SUCCESS)
return nRet;
/* Set the background color of selected objects */
nRet = L_AnnSetBackColor(hContainer, RGB(255,0,0),
ANNFLAG_SELECTED|ANNFLAG_RECURSE);
if(nRet != SUCCESS)
return nRet;
/* Get the bounding rectangle of selected objects */
nRet = L_AnnGetSelectRect(hContainer, &rAnnBounds);
if(nRet != SUCCESS)
return nRet;
/* Get the window's device context */
hWindowDC = GetDC (hWnd);
/* Display the change */
nRet = L_AnnDraw(hWindowDC, &rAnnBounds, hContainer);
if(nRet != SUCCESS)
return nRet;
/* Remove the queued paint message */
ValidateRect(hWnd, &rAnnBounds);
/* Get the number of objects selected */
nRet = L_AnnGetSelectCount(hContainer, &SelectCount);
if(nRet != SUCCESS)
return nRet;
/* Display a message box with the result */
wsprintf (szMessage, TEXT("%d objects selected"), SelectCount);
MessageBox (NULL, szMessage, TEXT("Notice"), MB_OK);
return SUCCESS;
}
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