ScrollDC.c

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/*
 * PROJECT:         ReactOS api tests
 * LICENSE:         GPL - See COPYING in the top level directory
 * PURPOSE:         Test for ScrollDC
 * PROGRAMMERS:     Timo Kreuzer
 */
 
#include "precomp.h"
 
void Test_ScrollDC()
{
    HWND hWnd, hWnd2;
    HDC hDC;
    HRGN hrgn;
    RECT rcClip;
    int iResult;
 
    /* Create a window */
    hWnd = CreateWindowW(L"BUTTON", L"TestWindow", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                        100, 100, 100, 100,
                        NULL, NULL, 0, 0);
    UpdateWindow(hWnd);
    hDC = GetDC(hWnd);
 
    /* Test that no update region is there */
    hrgn = CreateRectRgn(0,0,0,0);
    iResult = GetUpdateRgn(hWnd, hrgn, FALSE);
    ok (iResult == NULLREGION, "Expected NULLREGION, got %d\n", iResult);
 
    /* Test normal scrolling */
    ok(ScrollDC(hDC, 0, 0, NULL, NULL, hrgn, NULL) == TRUE, "ScrollDC failed\n");
 
    /* Scroll with invalid update region */
    DeleteObject(hrgn);
    ok(ScrollDC(hDC, 50, 0, NULL, NULL, (HRGN)0x12345678, NULL) == FALSE, "ScrollDC successed\n");
    ok(ScrollDC(hDC, 50, 0, NULL, NULL, hrgn, NULL) == FALSE, "ScrollDC successed\n");
    hrgn = CreateRectRgn(0,0,0,0);
    iResult = GetUpdateRgn(hWnd, hrgn, FALSE);
    ok(iResult == NULLREGION, "Expected NULLREGION, got %d\n", iResult);
 
    /* Scroll with invalid update rect pointer */
    ok(ScrollDC(hDC, 50, 0, NULL, NULL, NULL, (PRECT)1) == FALSE, "ScrollDC failed\n");
    iResult = GetUpdateRgn(hWnd, hrgn, FALSE);
    ok(iResult == NULLREGION, "Expected NULLREGION, got %d\n", iResult);
 
    /* Scroll with a clip rect */
    rcClip.left = 50; rcClip.top = 0; rcClip.right = 100; rcClip.bottom = 100;
    ok(ScrollDC(hDC, 50, 0, NULL, &rcClip, hrgn, NULL) == TRUE, "ScrollDC failed\n");
    iResult = GetUpdateRgn(hWnd, hrgn, FALSE);
    ok(iResult == NULLREGION, "Expected NULLREGION, got %d\n", iResult);
 
    /* Scroll with a clip rect */
    rcClip.left = 50; rcClip.top = 0; rcClip.right = 100; rcClip.bottom = 100;
    ok(ScrollDC(hDC, 50, 50, NULL, &rcClip, hrgn, NULL) == TRUE, "ScrollDC failed\n");
    iResult = GetUpdateRgn(hWnd, hrgn, FALSE);
    ok(iResult == NULLREGION, "Expected NULLREGION, got %d\n", iResult);
 
    /* Overlap with another window */
    hWnd2 = CreateWindowW(L"BUTTON", L"TestWindow", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                        30, 160, 100, 100,
                        NULL, NULL, 0, 0);
    UpdateWindow(hWnd2);
 
    /* Cleanup */
    ReleaseDC(hWnd, hDC);
    DestroyWindow(hWnd);
    DestroyWindow(hWnd2);
 
}
 
START_TEST(ScrollDC)
{
    Test_ScrollDC();
}