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控件间文本拖拽功能--上位机VC
控件间文本拖拽功能--上位机VC
功能展示
控件之间文本的拖拽可以很方便在一些时候，进行参数选项的设置，当前例程实现按钮Cbutton列表框CListBox,复选框CCheckBox，组合框CComboBox之间的文本拖拽功能，效果如图，拖拽按钮到列表控件，可将按钮文本复制到列表控件中，其他控件也一样可实现这一效果，还可将控件文本拖拽到其他程序中显示
要点提示
例程主要通过从微软类IDropTarget派生一自定义类实现interface ECOleMemDropTarget : public IDropTarget； 集成类中有四个虚函数供我们实现完成拖拽功能GotDrop() GotDrag() GotLeave() GotEnter()
所以这个类的使用会销麻烦些, GotDrop()用于实现拖拽放开后，控件文本的处理；GotDrag()用于拖拽过程信息的回馈 实现功能 1.新建基于对话框的应用程序 2.将集成类ECOleMemDropTarget对应两文件ECOleMemDropTarget.h, ECOleMemDropTarget.cpp复制到自己工程根目录并加载到工程，再派生一新类class ECMaterialDropText : publicECOleMemDropTarget用于实现前面四个虚函数；记得头文件中包含#include "ECOleMemDropTarget.h“ 3.实现想要有拖拽功能控件，当前例程实现3种控件的拖拽，按钮控件的拖拽实现： 从Cbutton派生新类class CButtonDragDrop : public Cbutton，包含头文件#include “ECMaterialDropText.h”，添加自定义变量及函数private: ECMaterialDropText *m_TargetDrop; CPoint m_StartPoint; UINT m_TimerID; void InitDrag();及运行时识别宏DECLARE_DYNAMIC(CButtonDragDrop)声明
4.添加虚函数PreSubclassWindow()调用InitDrag();构造函数中初始化变量，析构函数中释放变量 - void CButtonDragDrop::PreSubclassWindow()
- {
- InitDrag();
- CButton::PreSubclassWindow();
- }
- CButtonDragDrop::CButtonDragDrop()
- {
- m_TargetDrop =NULL;
- m_TimerID =0;
- m_StartPoint = CPoint(-1, -1);
- m_TargetDrop = new ECMaterialDropText();
- }
- CButtonDragDrop::~CButtonDragDrop()
- {
- if(m_TargetDrop)
- {
- m_TargetDrop->Revoke();// stop drag and drop
- delete m_TargetDrop;
- }
- m_TargetDrop = NULL;
- }
5.添加运行时识别宏实现IMPLEMENT_DYNAMIC(CButtonDragDrop,CButton)，再分别添加鼠标点击，放开，移动，定时器处理函数 - void CButtonDragDrop::OnLButtonDown(UINT nFlags, CPoint point)
- {
- m_StartPoint = point;
- m_TimerID = SetTimer(1, 100, NULL);
- CButton::OnLButtonDown(nFlags, point);
- }
- void CButtonDragDrop::OnLButtonUp(UINT nFlags, CPoint point)
- {
- m_StartPoint.x = -100;
- m_StartPoint.y = -100;
- if(m_TimerID)
- {
- KillTimer(m_TimerID);
- m_TimerID = 0;
- }
- CButton::OnLButtonUp(nFlags, point);
- }
- void CButtonDragDrop::OnMouseMove(UINT nFlags, CPoint point)
- {
- if(m_TimerID > 0)
- {
- if(00==(GetKeyState(VK_LBUTTON)&0XFF00) )
- {
- OnLButtonUp(0,CPoint(0,0));
- return;
- }
- int iX = m_StartPoint.x - point.x;
- int iY = m_StartPoint.y - point.y;
- if((iX*iX + iY*iY) > 100)// check if we really moved enough
- {
- COleDataSource* pSource = new COleDataSource();
- if(pSource)
- {
- CSharedFile sf(GMEM_MOVEABLE|GMEM_DDESHARE|GMEM_ZEROINIT);
- CString iText;
- GetWindowText(iText);
- sf.Write(iText, iText.GetLength());// write name to clipboard
- HGLOBAL hMem = sf.Detach();
- if (!hMem) return;
- pSource->CacheGlobalData(CF_TEXT, hMem);
- pSource->DoDragDrop();// Do drag and drop!
- delete pSource;
- }
- }
- }
- CButton::OnMouseMove(nFlags, point);
- }
- void CButtonDragDrop::OnTimer(UINT nIDEvent)
- {
- if(nIDEvent == 1)// check if mouse is still in rect
- {
- POINT pt;
- ::GetCursorPos(&pt);
- CRect iRect;
- GetWindowRect(iRect);
- if(!(iRect.PtInRect(pt)))
- {
- KillTimer(nIDEvent);
- m_TimerID = 0;
- }
- }
- CButton::OnTimer(nIDEvent);
- }
6.一样的方法实现其他想要有拖拽功能的控件，当前例程还实现有class CComboxDragDrop， CListBoxDragDrop，一样的实现过程，下面就是类ECMaterialDropText的四个虚函数的实现。
在类的源文件顶部包含头文件#include “gkbc8Dlg.h”#include “ButtonDragDrop.h”#include“ListBoxDragDrop.h”#include “ComboxDragDrop.h“ 分别实现四个函数体部分 - DWORD ECMaterialDropText::GotDrag(void)
- {
- if(m_DropTargetWnd)
- {
- CPoint iPoint = m_DropPoint;
- CWnd *iPossibleWnd = CWnd::WindowFromPoint(iPoint);
- if(NULL == iPossibleWnd)
- return DROPEFFECT_NONE;
- if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CButtonDragDrop)))
- {
- if(AfxGetMainWnd())
- {
- CString iRSString("Dropping on button");
- ((CGkbc8Dlg *)AfxGetMainWnd())->UpdateNotation(iRSString);
- }
- return DROPEFFECT_COPY;
- }
- else if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CListBoxDragDrop)))
- {
- if(AfxGetMainWnd())
- {
- CString iRSString("Dropping on ListBox");
- ((CGkbc8Dlg *)AfxGetMainWnd())->UpdateNotation(iRSString);
- }
- return DROPEFFECT_LINK; // something else again
- }
- else if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CComboxDragDrop)))
- {
- if(AfxGetMainWnd())
- {
- CString iRSString("Dropping on Combox");
- ((CGkbc8Dlg *)AfxGetMainWnd())->UpdateNotation(iRSString);
- }
- return DROPEFFECT_LINK;
- }
- }
- return DROPEFFECT_NONE;
- }
- void ECMaterialDropText::GotDrop(void)
- {
- if(m_Data)
- {
- char *iText = (char *)m_Data;// get the text
- if((iText) && (m_DropTargetWnd))
- {
- TRACE("Found text %s.\n", iText);
- CPoint iPoint = m_DropPoint;
- // lets check if this one wants use
- CWnd *iPossibleWnd = CWnd::WindowFromPoint(iPoint);
- if(NULL == iPossibleWnd)
- return;
- // check if this is one of us...
- if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CButtonDragDrop)))
- {
- ((CButtonDragDrop *)iPossibleWnd)->SetWindowText(iText);
- }
- else if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CListBoxDragDrop)))
- {
- ((CListBoxDragDrop *)iPossibleWnd)->AddString(iText);
- }
- else if(iPossibleWnd->IsKindOf(RUNTIME_CLASS(CComboxDragDrop)))
- {
- ((CComboxDragDrop *)iPossibleWnd)->AddString(iText);
- ((CComboxDragDrop *)iPossibleWnd)->SetCurSel(0);
- }
- }
- }
- }
- void ECMaterialDropText::GotLeave(void)
- {
- }
- DWORD ECMaterialDropText::GotEnter(void)
- {
- return DROPEFFECT_LINK;
- }
7.在主对话框中分别添加按钮，组合框，复选框，列表框分别关联前面创建的控件类，再添加一静态控件ID改为IDC_NOTATION用于显示拖拽过程的信息，添加函数UpdateNotation()实现信息显示
我们来演示功能实现过程
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