wxWidgets/interface/wx/bannerwindow.h

///////////////////////////////////////////////////////////////////////////////
// Name:        interface/wx/bannerwindow.h
// Purpose:     wxBannerWindow class documentation
// Author:      Vadim Zeitlin
// Created:     2011-08-16
// RCS-ID:      $Id$
// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

/**
    A simple banner window showing either a bitmap or text.

    Banner windows can be used to present some overview of the current window
    contents to the user in an aesthetically pleasant way. They are typically
    positioned along the left or top edge of the window (although this class
    also supports right- and bottom-aligned banners) and show either a bitmap
    with a logo or a few lines of text on a gradient-filled background.

    Using this class is very simple, e.g.:
    @code
    MyFrame::MyFrame(...)
    {
        ... create the frame itself ...

        // Create and initialize the banner.
        wxBannerWindow* banner = new wxBannerWindow(this, wxTOP);
        banner->SetText("Welcome to my wonderful program",
                        "  Before doing anything else, you need to connect to "
                        "the online server.\n"
                        "  Please enter your credentials in the controls below.");

        // And position it along the left edge of the window.
        wxSizer* sizer = new wxBoxSizer(wxVERTICAL);
        sizer->Add(banner, wxSizerFlags().Expand());

        ... add the rest of the window contents to the same sizer ...

        SetSizerAndFit(sizer);
    }
    @endcode

    This class is currently implemented generically and so looks the same under
    all platforms.

    @library{wxadv}
    @category{miscwnd}
    @genericAppearance{bannerwindow.png}

    @since 2.9.3
 */
class wxBannerWindow : public wxWindow
{
public:
    /**
        Default constructor, use Create() later.

        This constructor is only used for two-step creation, if possible,
        prefer using the constructor below directly instead of using this one
        and calling Create() later.
     */
    wxBannerWindow();

    /**
        Convenient constructor that should be used in the majority of cases.

        The only really important arguments of the full constructor below are
        @a parent and @a dir so this class provides a convenient constructor
        taking only them.

        The banner orientation changes how the text in it is displayed and also
        defines where is the bitmap truncated if it's too big to fit but doesn't
        do anything for the banner position, this is supposed to be taken care
        of in the usual way, e.g. using sizers.
    */
    wxBannerWindow(wxWindow* parent, wxDirection dir = wxLEFT);

    /**
        Full constructor provided for consistency with the other classes only.

        Prefer to use the shorter constructor documented above. You should
        rarely, if ever, need to use non-default values for any other
        parameters: as the banner window doesn't generate any events, its
        identifier is not particularly useful; its position and size will be
        almost always managed by the containing sizer and it doesn't have any
        specific styles. So only the parent and the banner direction need to be
        specified.
     */
    wxBannerWindow(wxWindow* parent,
                   wxWindowID winid,
                   wxDirection dir = wxLEFT,
                   const wxPoint& pos = wxDefaultPosition,
                   const wxSize& size = wxDefaultSize,
                   long style = 0,
                   const wxString& name = wxBannerWindowNameStr);

    /**
        Really create the banner window for the objects created using the
        default constructor.

        It's an error to call Create() for the objects created using
        non-default constructor.
     */
    bool Create(wxWindow* parent,
                wxWindowID winid,
                wxDirection dir = wxLEFT,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = 0,
                const wxString& name = wxBannerWindowNameStr);


    /**
        Provide the bitmap to use as background.

        Notice that ideally the bitmap should be big enough to always cover the
        entire banner, e.g. for a horizontal banner with wxTOP style its width
        should be bigger than any reasonable window size. Otherwise the bitmap
        is extended to cover the entire window area with a solid colour taken
        from the bitmap pixel on the edge in which direction the extension
        occurs so all bitmap pixels on this edge (top for wxLEFT, right for
        wxTOP and wxBOTTOM and bottom for wxRIGHT) should have the same colour
        to avoid jarring discontinuity.

        If, on the other hand, the bitmap is bigger than the window size, then
        it is truncated. For wxLEFT orientation the bitmap is truncated from
        the top, for wxTOP and wxBOTTOM -- from the right and for wxRIGHT --
        from the bottom, so put the most important part of the bitmap
        information in the opposite direction where it will never be truncated.

        If no valid background bitmap is specified, the banner draws gradient
        background but if a valid bitmap is given here, the gradient is not
        draw and the start and end colours specified for it are ignored.

        @param bmp Bitmap to use as background. May be invalid to indicate
            that no background bitmap should be used.
     */
    void SetBitmap(const wxBitmap& bmp);

    /**
        Set the text to display.

        This is mutually exclusive with SetBitmap().

        Title is rendered in bold and should be single line, message can have
        multiple lines but is not wrapped automatically, include explicit line
        breaks in the string if you want to have multiple lines.
     */
    void SetText(const wxString& title, const wxString& message);

    /**
        Set the colours between which the gradient runs.

        The gradient colours are ignored if SetBitmap() is used.
     */
    void SetGradient(const wxColour& start, const wxColour& end);
};