Patch enabling checking if back and forward are possible

[HansDR]

I wanted to be able to enable/disable the backward and forward icons based on whether or not those actions were possible, so here's a small patch that extracts this information directly from XULRunner.

In webcontrol.h, add the following methods to wxWebControl:

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    bool CanGoForward() const;
    bool CanGoBack() const;


In webcontrol.cpp, add the method implementations:

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// (METHOD) wxWebControl::CanGoForward
// Description: Returns true if it is possible to navigate forward,
// and false otherwise.
//
// Syntax: bool wxWebControl::CanGoForward()
//
// Remarks:
//
// Returns: True if it is possible to navigate forward

bool wxWebControl::CanGoForward() const
{
    PRBool canGoForward;
    m_ptrs->m_web_navigation->GetCanGoForward(&canGoForward);
    return (canGoForward == PR_TRUE);
}

// (METHOD) wxWebControl::CanGoBackward
// Description: Returns true if it is possible to navigate backward,
// and false otherwise.
//
// Syntax: bool wxWebControl::CanGoBackward()
//
// Remarks:
//
// Returns: True if it is possible to navigate backward

bool wxWebControl::CanGoBack() const
{
    PRBool canGoBackward;
    m_ptrs->m_web_navigation->GetCanGoBack(&canGoBackward);
    return (canGoBackward == PR_TRUE);
}


Probably the best place to use this is the application's wxEVT_WEB_LOCATIONCHANGE event handler, e.g.:

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void BrowserWindow::onLocationChange(wxWebEvent& event)
{
    browserToolBar->EnableTool(wxID_BACKWARD, webControl->CanGoBack());
    browserToolBar->EnableTool(wxID_FORWARD, webControl->CanGoForward());
    browserToolBar->Refresh();
}


The refresh at the end of the event handler is because the wxAUIToolBar wasn't refreshing automatically.

Hans