【Demo 0023】改变窗体的位置, 大小及Z-ORDER
在我们【改变窗体的位置及大小】中有讲解类似的内容, 这一节将讲述更高级一些的API,它不仅改变窗体的位置,大小还可以改变窗体间的前后顺序即Z-ORDER, 另外支持控制窗体其他属性如:显示/隐藏, 更新后窗体刷新状态等.
(一) 函数定义及演示代码
BOOL SetWindowPos(HWND hWnd, HWND hInsertAfter, int x, int y, int cx, int cy, UINT nFlag)
hInsertAfter 参数说明:
HWND_BOTTOM 将当前窗体置于所有最顶层窗体的最低层
- HWND_NOTOPMOST 将当前窗体置于所有最顶层窗体之下
- HWND_TOP 将当前窗体置于项层
- HWND_TOPMOST 将当前窗体置于最顶层
设置指定窗体(控件、弹出式窗体和顶层窗体)的位置,大小和z-order
Code 1: 通过SetWindowPos 将主窗体移动到屏幕客户区中间
//--: Move Main wnd to center of screen
RECT rtMainWnd;
GetClientRect(hWnd, &rtMainWnd);
UINT nWndWidth = (rtMainWnd.right - rtMainWnd.left);
UINT nWndHeight = (rtMainWnd.bottom - rtMainWnd.top);
UINT nLeft = (nSrnWidth - nWndWidth) / 2;
UINT nTop = (nSrnHeight - nWndHeight) / 2;
SetWindowPos(hWnd, NULL, nLeft, nTop, nWndWidth, nWndHeight, SWP_NOSIZE|SWP_NOZORDER);
RECT rtMainWnd;
GetClientRect(hWnd, &rtMainWnd);
UINT nWndWidth = (rtMainWnd.right - rtMainWnd.left);
UINT nWndHeight = (rtMainWnd.bottom - rtMainWnd.top);
UINT nLeft = (nSrnWidth - nWndWidth) / 2;
UINT nTop = (nSrnHeight - nWndHeight) / 2;
SetWindowPos(hWnd, NULL, nLeft, nTop, nWndWidth, nWndHeight, SWP_NOSIZE|SWP_NOZORDER);
Code 2: 通过SetWindowPos 改变控件大小并居中对齐(将控件放大一倍)
//--: Move "Move Center" Button to center of client area and inflate
RECT rtBtnMove;
GetClientRect(hBtnWndMove, &rtBtnMove);
UINT nMoveBtnWidth = 200;
UINT nMoveBtnHeight = 100;
UINT nX = (nWndWidth - nMoveBtnWidth) / 2;
UINT nY = (nWndHeight - nMoveBtnHeight) / 2;
SetWindowPos(hBtnWndMove, NULL, nX, nY, nMoveBtnWidth, nMoveBtnHeight, SWP_NOZORDER);
Code 3: 通过SetWindowPos 改变主窗体的z-ORDER(动态设置到最顶层或取消最顶层属性)
static bool bTopMost = false;
HWND hWndInsertAfter;
if (bTopMost)
{
hWndInsertAfter = HWND_NOTOPMOST; // HWND_BOTTOM; //HWND_TOP;
SetWindowText(hBtnWndState, _T("To TopMost"));
bTopMost = false;
} else {
hWndInsertAfter = HWND_TOPMOST;
SetWindowText(hBtnWndState, _T("To NoTopMost"));
bTopMost = true;
}
SetWindowPos(hWnd, hWndInsertAfter, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE);