如何调整 Win32 列表框的大小以适合其内容?
How to resize a Win32 listbox to fit its content?
是否有任何方法可以在项目更改时调整 Win32 列表框的大小以适应其内容(显示所有内容的最小大小,不需要滚动条)?
谢谢!
编辑:我需要调整列表框的宽度和高度。
你没有指定你想要水平还是垂直,但我假设不是。基本上,您需要获取项目数和项目高度并将它们相乘,然后为控件边框添加 space(除非控件是无边框的,否则您可能需要尝试一下):
void AutosizeListBox(HWND hWndLB)
{
int iItemHeight = SendMessage(hWndLB, LB_GETITEMHEIGHT, 0, 0);
int iItemCount = SendMessage(hWndLB, LB_GETCOUNT, 0, 0);
// calculate new desired client size
RECT rc;
GetClientRect(hWndLB, &rc);
rc.bottom = rc.top + iItemHeight * iItemCount;
// grow for borders
rc.right += GetSystemMetrics(SM_CXEDGE) * 2;
rc.bottom += GetSystemMetrics(SM_CXEDGE) * 2;
// resize
SetWindowPos(hWndLB, 0, 0, 0, rc.right, rc.bottom, SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
如果您还需要水平调整大小,则需要 select 将正确的字体放入 DC,并循环遍历所有项目以使用 GetTextExtentPoint32
.[=13 计算最大文本长度=]
编辑:添加了一个也计算水平尺寸的版本。
void AutosizeListBox(HWND hWndLB)
{
int iItemHeight = SendMessage(hWndLB, LB_GETITEMHEIGHT, 0, 0);
int iItemCount = SendMessage(hWndLB, LB_GETCOUNT, 0, 0);
// get a DC and set up the font
HDC hDC = GetDC(hWndLB);
HGDIOBJ hOldFont = SelectObject(hDC, (HGDIOBJ)SendMessage(hWndLB, WM_GETFONT, 0, 0));
// calculate width of largest string
int iItemWidth = 0;
for (int i = 0; i < iItemCount; i++)
{
int iLen = SendMessage(hWndLB, LB_GETTEXTLEN, i, 0);
TCHAR* pBuf = new TCHAR[iLen + 1];
SendMessage(hWndLB, LB_GETTEXT, i, (LPARAM)pBuf);
SIZE sz;
GetTextExtentPoint32(hDC, pBuf, iLen, &sz);
if (iItemWidth < sz.cx) iItemWidth = sz.cx;
delete[] pBuf;
}
SelectObject(hDC, hOldFont);
ReleaseDC(hWndLB, hDC);
// calculate new desired client size
RECT rc;
SetRect(&rc, 0, 0, iItemWidth, iItemHeight * iItemCount);
// grow for borders
rc.right += GetSystemMetrics(SM_CXEDGE) * 2;
rc.bottom += GetSystemMetrics(SM_CXEDGE) * 2;
// resize
SetWindowPos(hWndLB, 0, 0, 0, rc.right, rc.bottom, SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
是否有任何方法可以在项目更改时调整 Win32 列表框的大小以适应其内容(显示所有内容的最小大小,不需要滚动条)?
谢谢!
编辑:我需要调整列表框的宽度和高度。
你没有指定你想要水平还是垂直,但我假设不是。基本上,您需要获取项目数和项目高度并将它们相乘,然后为控件边框添加 space(除非控件是无边框的,否则您可能需要尝试一下):
void AutosizeListBox(HWND hWndLB)
{
int iItemHeight = SendMessage(hWndLB, LB_GETITEMHEIGHT, 0, 0);
int iItemCount = SendMessage(hWndLB, LB_GETCOUNT, 0, 0);
// calculate new desired client size
RECT rc;
GetClientRect(hWndLB, &rc);
rc.bottom = rc.top + iItemHeight * iItemCount;
// grow for borders
rc.right += GetSystemMetrics(SM_CXEDGE) * 2;
rc.bottom += GetSystemMetrics(SM_CXEDGE) * 2;
// resize
SetWindowPos(hWndLB, 0, 0, 0, rc.right, rc.bottom, SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
如果您还需要水平调整大小,则需要 select 将正确的字体放入 DC,并循环遍历所有项目以使用 GetTextExtentPoint32
.[=13 计算最大文本长度=]
编辑:添加了一个也计算水平尺寸的版本。
void AutosizeListBox(HWND hWndLB)
{
int iItemHeight = SendMessage(hWndLB, LB_GETITEMHEIGHT, 0, 0);
int iItemCount = SendMessage(hWndLB, LB_GETCOUNT, 0, 0);
// get a DC and set up the font
HDC hDC = GetDC(hWndLB);
HGDIOBJ hOldFont = SelectObject(hDC, (HGDIOBJ)SendMessage(hWndLB, WM_GETFONT, 0, 0));
// calculate width of largest string
int iItemWidth = 0;
for (int i = 0; i < iItemCount; i++)
{
int iLen = SendMessage(hWndLB, LB_GETTEXTLEN, i, 0);
TCHAR* pBuf = new TCHAR[iLen + 1];
SendMessage(hWndLB, LB_GETTEXT, i, (LPARAM)pBuf);
SIZE sz;
GetTextExtentPoint32(hDC, pBuf, iLen, &sz);
if (iItemWidth < sz.cx) iItemWidth = sz.cx;
delete[] pBuf;
}
SelectObject(hDC, hOldFont);
ReleaseDC(hWndLB, hDC);
// calculate new desired client size
RECT rc;
SetRect(&rc, 0, 0, iItemWidth, iItemHeight * iItemCount);
// grow for borders
rc.right += GetSystemMetrics(SM_CXEDGE) * 2;
rc.bottom += GetSystemMetrics(SM_CXEDGE) * 2;
// resize
SetWindowPos(hWndLB, 0, 0, 0, rc.right, rc.bottom, SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}