| 字词 | CCmdTarget::RestoreWaitCursor |
| 释义 | CCmdTarget::RestoreWaitCursor void RestoreWaitCursor( ); 说明： 本函数用于在系统光标改变后重置沙漏标（例如，在一个耗时操作的过程中打开一个消息窗口而后又关闭它。） 示例： // The following example illustrates the most common case // of displaying the hourglass cursor during some lengthy // processing of a command handler implemented in some // CCmdTarget-derived class,such as a document or view. void CMyView::OnSomeCommand( ) { BeginWaitCursor( ); // display the hourglass cursor // do some lengthy processing EndWaitCursor( ); // remove the hourglass cursor } // The next example illustrates RestoreWaitCursor void CMyView::OnSomeCommand( ) { BeginWaitCursor( ); // display the hourglass cursor // do some lengthy processing // The dialog box will normally change the cursor to // the standard arrow cursor,and leave the cursor in // as the standard arrow cursor when the dialog box is // closed. CMyDialog dlg; dlg.DoModal( ); // It is necessary to call RestoreWaitCursor here in order // to change the cursor back to the hourglass cursor. RestoreWaitCursor( ); // do some more lengthy processing EndWaitCursor( ); // remove the hourglass cursor } // In the above example,the dialog was clearly invoked between // the pair of calls to BeginWaitCursor and EndWaitCursor. // Sometimes it may not be clear whether the dialog is invoked // in between a pair of calls to BeginWaitCursor and EndWaitCursor. // It is permissable to call RestoreWaitCursor,even if // BeginWaitCursor was not previously called.This case is // illustrated below,where CMyView::AnotherFunction does not // need to know whether it was called in the context of an // hourglass cursor. void CMyView::AnotherFunction( ) { // some processing... CMyDialog dlg; dlg.DoModal( ); RestoreWaitCursor( ); // some more processing... } // If the dialog is invoked from a member function of // some non-CCmdTarget,the you call CWinApp::DoWaitCursor // with a 0 parameter value to restore the hourglass cursor. void CMyObject::AnotherFunction( ) { CMyDialog dlg; dlg.DoModal( ); AfxGetApp( )->DoWaitCursor(0); // same as CCmdTarget::RestorWaitCursor } 请参阅： CWaitCursor, CCmdTarget::EndWaitCursor, CCmdTarget::BeginWaitCursor, CWinApp::DoWaitCursor |
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