在对话框上添加一个static控件,派生CScrollStatic类,该类内添加一个初始化函数,添加了一横一纵两个Scrollbar为成员变量,继承了对WM_VSCROLL和WM_HSCROLL的响应函数但未做处理,在OnPaint函数中判断Scrollbar位置并显示位图。
在对话框类中添加派生类的变量,并使之显示指定的位图。当前问题为,初始时位图显示正常,但是不管怎么拖动滚动条,位图显示并未发生变化,仿佛读回来的ScrollPos始终为0.而且只要一松鼠标左键,滚动条就回到了初始位置,百思不得其解,望明白人指点!~~~
在对话框类中添加派生类的变量,并使之显示指定的位图。当前问题为,初始时位图显示正常,但是不管怎么拖动滚动条,位图显示并未发生变化,仿佛读回来的ScrollPos始终为0.而且只要一松鼠标左键,滚动条就回到了初始位置,百思不得其解,望明白人指点!~~~
void CMyView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
// Get the minimum and maximum scroll-bar positions.
int minpos;
int maxpos;
pScrollBar->GetScrollRange(&minpos, &maxpos);
maxpos = pScrollBar->GetScrollLimit(); // Get the current position of scroll box.
int curpos = pScrollBar->GetScrollPos(); // Determine the new position of scroll box.
switch (nSBCode)
{
case SB_LEFT: // Scroll to far left.
curpos = minpos;
break; case SB_RIGHT: // Scroll to far right.
curpos = maxpos;
break; case SB_ENDSCROLL: // End scroll.
break; case SB_LINELEFT: // Scroll left.
if (curpos > minpos)
curpos--;
break; case SB_LINERIGHT: // Scroll right.
if (curpos < maxpos)
curpos++;
break; case SB_PAGELEFT: // Scroll one page left.
{
// Get the page size.
SCROLLINFO info;
pScrollBar->GetScrollInfo(&info, SIF_ALL);
if (curpos > minpos)
curpos = max(minpos, curpos - (int) info.nPage);
}
break; case SB_PAGERIGHT: // Scroll one page right.
{
// Get the page size.
SCROLLINFO info;
pScrollBar->GetScrollInfo(&info, SIF_ALL); if (curpos < maxpos)
curpos = min(maxpos, curpos + (int) info.nPage);
}
break; case SB_THUMBPOSITION: // Scroll to absolute position. nPos is the position
curpos = nPos; // of the scroll box at the end of the drag operation.
break; case SB_THUMBTRACK: // Drag scroll box to specified position. nPos is the
curpos = nPos; // position that the scroll box has been dragged to.
break;
} // Set the new position of the thumb (scroll box).
pScrollBar->SetScrollPos(curpos); CView::OnHScroll(nSBCode, nPos, pScrollBar);
}
从CScrollView派生可能会更容易些
估计是没 首先要给定一个范围 用断点调试pos的值
不过这次是要求派生出一个static的类出来,只好研究一下啦。还有SetScrollRange我也调过了啊,还是不对呢。
感谢LS各位的提醒,散分