Introduce skeleton of taskbar button feature.

- Add classes: wxTaskBarButton and wxTaskBarButtonImpl.
- New interface in wxTopLevelWindowMSW to get its wxTaskBarButton:
    MSWGetTaskBarButton.
- A simple sample and build files under msvc.

Author: Chaobin Zhang

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77591 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/taskbarbutton/taskbarbutton.cpp

@@ -0,0 +1,98 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        taskbarbutton.cpp
+// Purpose:     wxTaskbarButton sample
+// Author:      Chaobin Zhang <zhchbin@gmail.com>
+// Created:     2014-04-30
+// Copyright:   (c) 2014 wxWidgets development team
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
+#include "wx/taskbarbutton.h"
+
+enum
+{
+    ProgressValueSlider = wxID_HIGHEST,
+};
+
+class MyApp : public wxApp
+{
+public:
+    virtual bool OnInit();
+};
+
+class MyFrame : public wxFrame
+{
+public:
+    MyFrame(const wxString& title);
+
+private:
+    wxDECLARE_EVENT_TABLE();
+
+    void OnSetProgressValue(wxScrollEvent& WXUNUSED(event));
+
+    wxSlider *m_slider;
+};
+
+IMPLEMENT_APP(MyApp)
+
+bool MyApp::OnInit()
+{
+    if ( !wxApp::OnInit() )
+        return false;
+
+    MyFrame *frame = new MyFrame("wxTaskbarButton App");
+    frame->Show(true);
+
+    return true;
+}
+
+MyFrame::MyFrame(const wxString& title)
+       : wxFrame(NULL, wxID_ANY, title)
+{
+    wxPanel *panel = new wxPanel(this);
+    wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);
+    wxFlexGridSizer *gs = new wxFlexGridSizer(4, 2, 10, 10);
+
+    // SetProgressValue section.
+    wxStaticBoxSizer *spvSizer =
+        new wxStaticBoxSizer(wxVERTICAL, panel, wxT("SetProgressValue"));
+    int flags = wxSL_MIN_MAX_LABELS | wxSL_VALUE_LABEL | wxSL_AUTOTICKS;
+    m_slider = new wxSlider(spvSizer->GetStaticBox(), ProgressValueSlider,
+                            0, 0, 100,
+                            wxDefaultPosition, wxSize(250, -1),
+                            flags);
+    m_slider->SetTickFreq(10);
+    spvSizer->Add(m_slider);
+
+    gs->Add(spvSizer, 0, wxEXPAND);
+
+    wxStaticText *text = new wxStaticText(
+        panel, wxID_ANY, wxT("Welcome to wxTaskbarButton sample"));
+    mainSizer->Add(text, 0, wxALIGN_CENTRE_HORIZONTAL);
+    mainSizer->Add(gs);
+
+    panel->SetSizer(mainSizer);
+
+    SetIcon(wxICON(sample));
+    SetSize(537, 420);
+    Centre();
+}
+
+wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
+    EVT_COMMAND_SCROLL_CHANGED(ProgressValueSlider, MyFrame::OnSetProgressValue)
+wxEND_EVENT_TABLE()
+
+void MyFrame::OnSetProgressValue(wxScrollEvent& WXUNUSED(event))
+{
+    MSWGetTaskBarButton()->SetProgressValue(m_slider->GetValue());
+}