[WTL/ATL]_[初级]_[设置超链接字体颜色]

程序员文章站 2022-05-29 09:26:05

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场景

1.在开发WTL(Win32)程序时，超链接控件是很常见的，比如需要跳转网页或者打开本地文件夹等，都需要用到。Win32本身就有提供系统自带的WC_LINK控件，而我们用WTL有相应的封装类CLinkCtrl<atlctrls.h>.

2.有时需要根据界面的颜色主题需要修改超链接的颜色以适配界面。但是CLinkCtrl并没有提供修改字体颜色的方法, 而微软的MSDN里对Link也没有相应修改颜色的例子或说明. 如何做？

说明

1.一般情况下我们知道修改系统控件的字体颜色都是通过响应WM_CTLCOLORSTATIC,WM_CTLCOLOREDIT,WM_CTLCOLORBTN等相关消息来修改。超链接控件也是一样的，需要响应WM_CTLCOLORSTATIC并修改如下:

BEGIN_MSG_MAP 里添加

MESSAGE_HANDLER(WM_CTLCOLORSTATIC, OnCtlColor)

OnCtlColor 实现增加.

SetBkMode(hDC,TRANSPARENT);
SetTextColor(hDC,RGB(255,0,0));
return (LRESULT)AtlGetStockBrush(HOLLOW_BRUSH);

但是不生效,咋办？如果我们有时间和耐心看完官方的SysLink里的Link Attributes也有说明. 里面用到一个结构体LITEM的state的值LIS_DEFAULTCOLORS,原来SysLink的默认颜色是不能改的，需要通过设置LIS_DEFAULTCOLORS来启用颜色可修改, 那就好办了。只要通过在创建SysLink之后设置LIS_DEFAULTCOLORS启用颜色可修改。我们的OnCtlColor里的更改字体颜色就会生效.

LITEM item = { 0 };
item.iLink = 0;
item.mask = LIF_ITEMINDEX | LIF_STATE;
item.state = LIS_DEFAULTCOLORS; // 修改默认超链接颜色需要vista以上系统才支持.
item.stateMask = LIS_DEFAULTCOLORS;
SendMessage(link_support_, LM_SETITEM, 0, (LPARAM)&item);

代码

View.h

// View.h : interface of the CView class
//
/////////////////////////////////////////////////////////////////////////////

#pragma once

enum
{
	kMyDeviceLinkSupportId = WM_USER+1
};

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_CTLCOLORSTATIC, OnCtlColor)
		MESSAGE_HANDLER(WM_PAINT, OnPaint)
	END_MSG_MAP()

// Handler prototypes (uncomment arguments if needed):
//	LRESULT MessageHandler(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
//	LRESULT CommandHandler(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
//	LRESULT NotifyHandler(int /*idCtrl*/, LPNMHDR /*pnmh*/, BOOL& /*bHandled*/)

	LRESULT OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	int OnCreate(LPCREATESTRUCT lpCreateStruct);
	LRESULT OnCtlColor(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

private:
	CLinkCtrl link_support_;
	CFont font_16_normal_;
};

View.cpp

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

#include "stdafx.h"
#include "resource.h"

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

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

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

	//TODO: Add your drawing code here

	return 0;
}

static HFONT CreateFont(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;
}

LRESULT CView::OnCtlColor(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
	HDC hDC = (HDC)wParam;
	HWND hWnd = (HWND)lParam;

	if(hWnd == link_support_){
		SetBkMode(hDC,TRANSPARENT);
		SetTextColor(hDC,RGB(255,0,0));
		return (LRESULT)AtlGetStockBrush(HOLLOW_BRUSH);
	}
	return 0;
}

int CView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	LITEM item = { 0 };
    item.iLink = 0;
    item.mask = LIF_ITEMINDEX | LIF_STATE;
    item.state = LIS_DEFAULTCOLORS; // 修改默认超链接颜色需要vista以上系统才支持.
    item.stateMask = LIS_DEFAULTCOLORS;

	std::wstring text_link_connectfail;
	text_link_connectfail.append(L"hello <A HREF=\"https://infoworld.blog.csdn.net\">tobey</A>, "
		L"good good study,<A HREF=\"https://infoworld.blog.csdn.net\">day day up</A>.");

	font_16_normal_ = CreateFont(16,false,L"Arial");
	link_support_.Create(m_hWnd,NULL,text_link_connectfail.c_str(),
		WS_CHILD |WS_VISIBLE| WS_CLIPCHILDREN,0,kMyDeviceLinkSupportId);
	link_support_.SetFont(font_16_normal_);
	
	CSize size;
	link_support_.GetIdealSize(size);
	int rc = link_support_.SetWindowPos(NULL,100, 100, size.cx, size.cy,
			(SWP_NOZORDER | SWP_NOREPOSITION | SWP_NOACTIVATE));
	
    SendMessage(link_support_, LM_SETITEM, 0, (LPARAM)&item);
	item.iLink = 1;
	SendMessage(link_support_, LM_SETITEM, 0, (LPARAM)&item);

	return 0;
}