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[ATL/WTL]_[初级]_[在ListView指定的单元格显示ToolTip]

作者：互联网

场景

  1. WTL里CListViewCtrl是常用的显示表格数据的类. 有时候我们需要在表格的某个单元格显示一个按钮，并且鼠标移动上去时按钮有状态变化；或者显示这个按钮的一个ToolTip提示。如何做？

说明

  1. 要在表格的指定Cell或者某个鼠标位置发生消息响应。最后选的方案就是子类化CListViewCtrl，并响应WM_MOUSEMOVE消息，之后就是在这个消息里通过得到的坐标点计算得出nItem行和nSubItem列. 再来处理现实显示单元格内的按钮或ToolTip问题。但是这种方案需要在CListViewCtrl子类里实现。

  2. 除了改动子类外，可以查阅ListView的消息和通知看有没有相关的可以在父窗口捕抓的消息。有一个通知LVN_HOTTRACK就可以在父窗口捕抓，并且它提供了参数NMLISTVIEW,这个类型的iItem的值有时候会是-1,而iSubItem也有可能得到0,所以这个两个成员变量不需要。可以通过CListViewCtrl.SubItemHitTest方法来获取指定坐标所属的单元格，它需要提供一个LVHITTESTINFO的参数，获取成功后会在iItem和iSubItem里得到正确的单元格位置。

    typedef struct tagNMLISTVIEW {
  NMHDR  hdr;
  int    iItem;
  int    iSubItem;
  UINT   uNewState;
  UINT   uOldState;
  UINT   uChanged;
  POINT  ptAction;
  LPARAM lParam;
} NMLISTVIEW, *LPNMLISTVIEW;

typedef struct tagLVHITTESTINFO
{
    POINT pt;
    UINT flags;
    int iItem;
#if (_WIN32_IE >= 0x0300)
    int iSubItem;    // this is was NOT in win95.  valid only for LVM_SUBITEMHITTEST
#endif
#if _WIN32_WINNT >= 0x0600
    int iGroup; // readonly. index of group. only valid for owner data.
                // supports single item in multiple groups.
#endif
} LVHITTESTINFO, *LPLVHITTESTINFO;

  3. 关于CListViewCtrl响应ToolTip,它提供了一个SetToolTips方法，我们只需要创建一个CToolTipCtrl并初始化即可使用. 当不需要显示ToolTip时，可以通过SetToolTips(NULL)来关闭, 可以通过这个特性来开关ToolTip.

    tooltip_.Create(listview_,NULL,NULL,TTS_NOPREFIX);
tooltip_.AddTool(listview_,L"");
listview_.SetToolTips(tooltip_);

  4. 最后就是在LVN_HOTTRACK处理函数进行判断条件并显示ToolTip.

    static int kShowTooltipColumn = 2;
if(info.iSubItem == kShowTooltipColumn){
	BSTR buf = NULL;
	listview_.GetItemText(nItem,info.iSubItem,buf);
	tooltip_.UpdateTipText(buf,listview_);
	::SysFreeString(buf);

	if(!listview_.GetToolTips()) 
		listview_.SetToolTips(tooltip_);
}else{
	if(listview_.GetToolTips())
		listview_.SetToolTips(NULL);
}

例子

view.h

  1. 代码
    #pragma once

#include <utility>
#include <string>


enum
{
	kMyStaticId = WM_USER+1,
	kMyListViewId,
	kMyCheckListViewId,
	kMySortListViewId,
	kMyButtonId
};

class CView : public CWindowImpl<CView>
{
public:
	DECLARE_WND_CLASS(NULL)

	BOOL PreTranslateMessage(MSG* pMsg);

	BEGIN_MSG_MAP_EX(CView)
		MSG_WM_CREATE(OnCreate)
		MESSAGE_HANDLER(WM_PAINT, OnPaint)
		NOTIFY_HANDLER(kMyListViewId,NM_CLICK,OnNMClickListResult)
		NOTIFY_HANDLER(kMyListViewId,LVN_HOTTRACK,OnListItemHotTrack)
		REFLECT_NOTIFICATIONS()
	END_MSG_MAP()

	int OnCreate(LPCREATESTRUCT lpCreateStruct);
	LRESULT OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	void UpdateLayout();
	LRESULT OnNMClickListResult(int idCtrl,LPNMHDR pnmh,BOOL &bHandled);
	void AddMockData(CListViewCtrl& listview);
	void OnCommandIDHandlerEX(UINT uNotifyCode, int nID, CWindow wndCtl);
	LRESULT OnListItemHotTrack(int idCtrl,LPNMHDR pnmh,BOOL &bHandled);

private:
	std::wstring GetControlText(HWND hwnd,wchar_t* buf = NULL);

	CListViewCtrl listview_;

	CFont font_normal_;
	CFont font_bold_;

	CBrushHandle brush_white_;
	CBrushHandle brush_hollow_;
	CBrush brush_red_;
	CToolTipCtrl tooltip_;
	TCHAR strToolTipText_[MAX_PATH];

public:
};

View.cpp

  1. 代码
    // View.cpp : implementation of the CView class
//
/

#include "stdafx.h"
#include "resource.h"
#include <utility>
#include <sstream>
#include <assert.h>

#include "View.h"
#include <CommCtrl.h>
#include <string>
#include <regex>

using namespace std;

BOOL CView::PreTranslateMessage(MSG* pMsg)
{
	return FALSE;
}

LRESULT CView::OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	CPaintDC dc(m_hWnd);
	CMemoryDC mdc(dc,dc.m_ps.rcPaint);

	CRect rect_client;
	GetClientRect(&rect_client);
	mdc.FillSolidRect(rect_client,RGB(255,255,255));
	//TODO: Add your drawing code here

	return 0;
}

static HFONT GetFont(int pixel,bool bold,const wchar_t* font_name)
{
	LOGFONT lf; 
	memset(&lf, 0, sizeof(LOGFONT)); // zero out structure 
	lf.lfHeight = pixel; // request a 8-pixel-height font
	if(bold)
	{
		lf.lfWeight = FW_BOLD;  
	}
	lstrcpy(lf.lfFaceName, font_name); // request a face name "Arial"
	
	HFONT font = ::CreateFontIndirect(&lf);
	return font;
}


std::wstring CView::GetControlText(HWND hwnd,wchar_t* buf)
{
	auto length = ::GetWindowTextLength(hwnd);
	bool bufNull = false;
	if(!buf){
		buf = new wchar_t[length+1]();
		bufNull = true;
	}
	
	::GetWindowText(hwnd,buf,length+1);
	std::wstring str(buf);

	if(bufNull)
		delete []buf;

	return str;
}

static std::wstring GetProductBinDir()
{
	static wchar_t szbuf[MAX_PATH];  
	GetModuleFileName(NULL,szbuf,MAX_PATH);  
    PathRemoveFileSpec(szbuf);
	int length = lstrlen(szbuf);
	szbuf[length] = L'\\';
	szbuf[length+1] = 0;
	return std::wstring(szbuf);
}

LRESULT CView::OnNMClickListResult(int idCtrl,LPNMHDR pnmh,BOOL &bHandled)
{
	NMLISTVIEW* p = (NMLISTVIEW*) pnmh;
	int row = p->iItem;
	if(row == -1 || (row % 2))
		return 0;
	
	auto header = listview_.GetHeader();
	int nColumnCount = header.GetItemCount();
	int minLength = 8;
	wstringstream wss;
	for(int i =0; i< nColumnCount; ++i){
		BSTR buf = NULL;
		listview_.GetItemText(row,i,buf);
		wss << buf << L" : ";
		::SysFreeString(buf);
	}
	wstring str = wss.str();
	MessageBox(str.c_str());
	return 0;
}

void CView::AddMockData(CListViewCtrl& listview)
{
	listview.InsertColumn(0,L"No.",LVCFMT_LEFT,40);
	listview.InsertColumn(1,L"Name",LVCFMT_LEFT,200);
	listview.InsertColumn(2,L"Website",LVCFMT_LEFT,200);
	listview.InsertColumn(3,L"Level",LVCFMT_LEFT,200);

	wchar_t buf[MAX_PATH] = {0};
	LVCOLUMN co;
	memset(&co,0,sizeof(co));
	co.mask = LVCF_TEXT;
	co.pszText = buf;
	co.cchTextMax = MAX_PATH;
	listview.GetColumn(1,&co);
	std::wstring c0Text(buf);

	listview.GetColumn(2,&co);
	std::wstring c1Text(buf);
	
	listview.GetColumn(3,&co);
	std::wstring c2Text(buf);

	for(int i = 0; i<10;++i){
		
		wsprintf(buf,L"%d",i+1);
		listview.AddItem(i,0,buf);

		wsprintf(buf,(c0Text+L"-%d").c_str(),i);
		listview.AddItem(i,1,buf);

		wsprintf(buf,(c1Text+L"-%d").c_str(),i);
		listview.AddItem(i,2,buf);

		wsprintf(buf,(c2Text+L"-%d").c_str(),i);
		listview.AddItem(i,3,buf);
	}
}

LRESULT CView::OnListItemHotTrack(int idCtrl,LPNMHDR pnmh,BOOL &bHandled)
{
	bHandled = TRUE;
	LPNMLISTVIEW lpnmlv = (LPNMLISTVIEW) pnmh;
	
	// 获取坐标所在的Item(行)和SubItem(列).
	LVHITTESTINFO info;
	memset(&info,0,sizeof(info));
	info.pt = lpnmlv->ptAction;
	auto nItem = listview_.SubItemHitTest(&info);
	if(nItem == -1)
		return 0;

	static int kShowTooltipColumn = 2;
	if(info.iSubItem == kShowTooltipColumn){
		BSTR buf = NULL;
		listview_.GetItemText(nItem,info.iSubItem,buf);
		tooltip_.UpdateTipText(buf,listview_);
		::SysFreeString(buf);

		if(!listview_.GetToolTips()) 
			listview_.SetToolTips(tooltip_);
	}else{
		if(listview_.GetToolTips())
			listview_.SetToolTips(NULL);
	}

	return 0;
}

int CView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	font_normal_ = ::GetFont(16,false,L"Arial");
	font_bold_ = ::GetFont(16,true,L"Arial");

	// 1.创建CListViewCtrl
	listview_.Create(m_hWnd,0,NULL,WS_CHILD | WS_TABSTOP |WS_VISIBLE
		|LVS_ALIGNLEFT|LVS_REPORT|LVS_SHOWSELALWAYS|WS_BORDER,0,kMyListViewId);
	// 2.如果需要监听在listview鼠标移动消息，创建时传入LVS_EX_TRACKSELECT扩展样式。
	listview_.SetExtendedListViewStyle(LVS_EX_FULLROWSELECT|LVS_EX_GRIDLINES|LVS_EX_DOUBLEBUFFER|LVS_EX_TRACKSELECT);
	listview_.SetFont(font_normal_);
	auto header = listview_.GetHeader();
	header.SetFont(font_bold_);
	listview_.SetBkColor(RGB(255,255,255));
	AddMockData(listview_);

	tooltip_.Create(listview_,NULL,NULL,TTS_NOPREFIX);
	tooltip_.AddTool(listview_,L"");
	listview_.SetToolTips(tooltip_);
	listview_.SetHoverTime(10);

	brush_hollow_ = AtlGetStockBrush(HOLLOW_BRUSH);
	brush_white_ = AtlGetStockBrush(WHITE_BRUSH);
	brush_red_.CreateSolidBrush(RGB(255,0,0));
	UpdateLayout();

	return 0;
}

void CView::OnCommandIDHandlerEX(UINT uNotifyCode, int nID, CWindow wndCtl)
{
		
}

void CView::UpdateLayout()
{
	CRect rect;
	GetClientRect(&rect);

	CClientDC dc(m_hWnd);
	dc.SelectFont(font_normal_);

	CSize size_control(700,300);
	CRect rect_control = CRect(CPoint(20,20),size_control);
	listview_.MoveWindow(rect_control);

}

图示

在这里插入图片描述

项目下载

参考

extended-list-view-styles

lvm-sethovertime

标签：NULL,int,ATL,单元格,ToolTip,font,_.,listview,buf
来源： https://blog.csdn.net/infoworld/article/details/110185088