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MFC - C++ - CWnd derived control in markup

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Category: General
Forum Name: Samples and Demo Applications
Forum Description: Post your samples and demo applications here.
URL: http://forum.codejock.com/forum_posts.asp?TID=14413
Printed Date: 23 November 2024 at 9:20pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: MFC - C++ - CWnd derived control in markup

Posted By: gorski
Subject: MFC - C++ - CWnd derived control in markup
Date Posted: 29 May 2009 at 5:39am

I would like to present the way you can create your own XAML tag and put CWnd derived control inside markup. In my exaple I create edit box markup.

All you have to do is to create a class derived from CXTPMarkupFrameworkElement, register a new markup type and register some events, so you can interact with the control.

MarkupEdit.h


#pragma once
class MarkupEdit : public CXTPMarkupFrameworkElement
{
    DECLARE_MARKUPCLASS(MarkupEdit)

public:
    virtual CSize MeasureOverride(CXTPMarkupDrawingContext* pDC, CSize constraint);
    virtual void OnRender(CXTPMarkupDrawingContext* pDC);

    HWND GetEdit();  //returns HWND of the edit box control

protected:
    MarkupEdit() {}
    virtual ~MarkupEdit() {}
    
    void CreateControl(CRect rc);

protected:
    CXTPEdit mEdit; //the control we want to put into markup

public:
    static CXTPMarkupRoutedEvent* m_pCreateEvent; //an event we want to fire after the control is created
};

MarkupEdit.cpp


#include "stdafx.h"
#include "MarkupEdit.h"

CXTPMarkupRoutedEvent* MarkupEdit::m_pCreateEvent = NULL;

//This line bindes the markup control with its tag
IMPLEMENT_MARKUPCLASS(L"EditBox", MarkupEdit, CXTPMarkupFrameworkElement)

void MarkupEdit::RegisterMarkupClass()
{
    //register 'Create' event
    m_pCreateEvent = CXTPMarkupRoutedEvent::RegisterRoutedEvent(L"Create", CXTPMarkupRoutedEvent::routingBubble, MARKUP_TYPE(MarkupEdit));
}

CSize MarkupEdit::MeasureOverride(CXTPMarkupDrawingContext* /*pDC*/, CSize constraint)
{
    return constraint;
}

void MarkupEdit::OnRender(CXTPMarkupDrawingContext* pDC)
{
    if (!mEdit.GetSafeHwnd())
    {
        CRect rc = m_pMarkupContext->GetClientBoundingRect(this);
        CreateControl(rc);
    }
}

void MarkupEdit::CreateControl(CRect rc)
{
    if (m_pMarkupContext)
    {
        CWnd* wnd = CWnd::FromHandle(m_pMarkupContext->m_hContextWnd);
        if (wnd)
        {
            if (!mEdit.GetSafeHwnd())
            {
                mEdit.Create(ES_LEFT | ES_AUTOHSCROLL | WS_VISIBLE | WS_CHILD | WS_BORDER,
                    rc, wnd, 0);
                mEdit.SetFont(&XTAuxData().font);

                //fire 'Create' event
                CXTPMarkupRoutedEventArgs e(m_pCreateEvent, this);
                RaiseEvent(&e);
            }
        }
    }
}

HWND MarkupEdit::GetEdit()
{
    return mEdit.GetSafeHwnd();
}


    MarkupEdit::RegisterType();

You can do it for example in the constructor of CMarkupStatic class from Codejock sample.

Define method to handle control events:



    AddHandler(MarkupEdit::m_pCreateEvent, CreateMarkupClassDelegate(this, &CMarkupStatic::OnEditCreate));

Now you can put into XAML your tag:


...
<EditBox Tag='Edit1' Width='100' Height='26'/>
...

When the edit control is created inside markup, 'Create' event is fired and you can get the pointer or HWND of the control. If you put more edit boxes into markup, you can distighuish them by 'Tag' property.


void Avatar::OnEditCreate(CXTPMarkupObject* pSender, CXTPMarkupRoutedEventArgs* pArgs)
{
    if (pSender->IsKindOf(MARKUP_TYPE(MarkupEdit)))
    {
        pArgs->SetHandled();

        CXTPMarkupString* pTag = MARKUP_DYNAMICCAST(CXTPMarkupString, ((MarkupEdit*)pSender)->GetTag());
        if (pTag)
        {
            CString tag = (LPCTSTR)*pTag;
            if (tag == _T("Edit1"))
            {
                mEditHwnd = ((MarkupEdit*)pSender)->GetEdit();
            }
        }
    }
}

As long as markup exists, you can read whatever user entered into edit box.


    if (mEditHwnd)
    {
        CString text;
        ::GetWindowText(mEditHwnd, text.GetBufferSetLength(128), 128);
    }

Voila

Comments, questions and improvements are welcome.

Replies:

Posted By: Alina
Date Posted: 04 June 2009 at 6:57am

How can I create edit box markup in Visual Basic?
Please help!
Thank you!

Posted By: Krog
Date Posted: 27 June 2009 at 6:32am

Hi Alina!

In VB it is not possible :(

-------------
Product: Xtreme SuitePro (ActiveX) version 15.2.1
Platform: Windows XP SP2
Language: Visual Basic 6 SP6

Posted By: nemmartins
Date Posted: 02 May 2010 at 6:07pm

Hi! and how to make the edit control to have the same behavior as other controls, i.e., automatic resize, etc?

Posted By: pdhammond
Date Posted: 01 February 2012 at 5:54am

Hi, I tried this and could not get it to work. I expect this is my not understanding Code Jock idioms, and it's been a long time since I used MFC too.

Using this XAML:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<EditBox>Enter something...</EditBox>
</Page>

I get this error:
Cannot convert the string 'Enter something...' into a 'MarkupEdit' object. Line 5, position 38

One thing I was particulalry confused about was where the AddHandler call is supposed to go. Can someone point me to some good intrudcutory documentation on this idiom?

Thanks,
Pete.

Posted By: adrien
Date Posted: 24 April 2013 at 11:54pm

Pete - your markup is wrong. In the example it was

...
<EditBox Tag='Edit1' Width='100' Height='26'/>
...

not <EditBox>... </EditBox>

If you want some default text settable from the markup, you'd need to set it as a named attribute and extract that from the markup context when it's being created I guess.

-------------
http://www.wingate.com - http://www.wingate.com

Posted By: wywty
Date Posted: 28 May 2014 at 12:44am

this in ScrollViewer have bug